Boise, Idaho USA
1-4 June 2014
Book of Abstracts
© MMA 2014
8th International Conference on
Microwave Materials and their Applications
1-4 June 2014
Boise, Idaho USA
Proud Sponsors of MMA2014
Endorsed by:
Page 4
Table of Contents
Conference Program........................................................................................................................ 6
Conference Venue............................................................................................................................ 8
Cultural Tour and Reception.......................................................................................................... 10
Winery Tour and Banquet.............................................................................................................. 11
About Boise................................................................................................................................... 12
Invited Speakers............................................................................................................................. 13
Plenary Presentations..................................................................................................................... 14
Invited Presentations...................................................................................................................... 18
Contributed Presentations.............................................................................................................. 34
Poster Presentations....................................................................................................................... 56
Conference Organizers................................................................................................................... 69
Page 5
Conference Program
MMA2014
Boise, Idaho USA
Registration is open:
Sunday
Monday
Tuesday
Sunday
15:45 - 16:45
12:00 - 18:00
8:00 - 11:00
8:30 - 11:00
1 June 2014
TROLLEY TOUR OF BOISE
Location
meet at Boise Centre
Location
Snake/Payette
WELCOME RECEPTION
18:00 - 20:00
Monday
8:45 - 9:00
2 June 2014
CONFERENCE OPENING
Location
Session
Session Chair
Location
Plenary
Heli Jantunen, University of Oulu
Summit
J. David Carey, University of Surrey
Session
Session Chair
Location
Low-K materials and glass-ceramics 1
Eung Soo Kim, Kyonggi University
Summit
9:40 - 10:05
Invited
Hitoshi Ohsato, Nagoya Industrial Science
Research Institute
10:05 - 10:20
Contributed
Mei-Yu Chen, University of Oulu
10:20 - 10:35
Contributed
Sung Wook Jang, Kyonggi University
10:35 - 10:50
Contributed
Hubertus Braun, SCHOTT AG
Location
Snake/Payette
Session
Session Chair
Location
Low-K materials and glass-ceramics 2
Danilo Suvorov, Jozef Stefan Institute
Summit
11:20 - 11:45
Invited
Eung Soo Kim, Kyonggi University
Enhanced quality factor of wallastonite
glass-ceramics by heat-treatment method
11:45 - 12:00
Contributed
Low-permittivity and low-loss microwave
Marjeta Maček Kržmanc, Jozef Stefan Institute dielectrics based on feldspar and feldsparlike structures
12:00 - 12:15
Contributed
Akinori Kan, Meijo University
Location
Snake/Payette
9:00 - 9:30
Summit
Plenary Session
High frequency characterisation of graphene, carbon nanotubes and nanometals
Session
Session Chair
Location
Structure/Property Relationships
Sahn Nahm, Korea University
Salmon
9:40 - 10:05
Invited
Danilo Suvorov, Jozef Stefan Institute
Transient microstructures in complexperovskite-based microwave dielctrics
10:05 - 10:20
Contributed
Wei-Ting Chen, Penn State University
Studies on SrTiO 3 -based grain boundary
barrier capacitor
Dependence of microwave dielectric
properties on crystallization behaviour of
CaMgSi 2 O 6 glass-ceramics
10:20 - 10:35
Contributed
Hyun Jin Jo, Kyonggi University
Effect of Sn substitution on microwave
dielectric properties of
(Mg 0.95 Ni 0.05 )(Ti 1-x Sn x )O 3 ceramics
Titanate glass-ceramic materials for mobile
applications in the GHz frequency range
10:35 - 10:50
Contributed
Michael Hill, Trans-Tech Inc.
Enhanced Q, high dielectric constant
microwave dielectric materials for LTE
applications
Session
Session Chair
Location
Processing/Property Relationships
Jiang Jian Bian, Shanghai University
Salmon
11:20 - 11:45
Invited
Sahn Nahm, Korea University
Synthesis and microwave dielectric
properties of Ba 8 TiO 14 ceramics
11:45 - 12:10
Invited
Xiang Ming Chen, Zhejiang University
Order-disorder transition, domain structure
and microwave dielectric characteristics of
Ba((Co0.6Zn0.4)1/3Nb2/3)O3-based
ceramics
12:10 - 12:25
Contributed
Bing Liu, Zhejiang University
Effects of B 2 O 3 addition on sintering
behavior and microwave dielctric
propereties of (Sr 0.6 Ca 0.4 )LaAlO 4 ceramics
Millimeter-wave dielectrics with low
permittivity for radar and wireless
communications
Singtering behaviors of BaTiO 3 with 50
wt% of B 2 O 3 -Bi 2 O 3 -SiO 2 -ZnO glass at
ultra-low sintering temperature
4+
BREAK
10:50 - 11:20
Effect of Zn and In substitution for Mg and
Ga on microwave dieelctric properties of
spinel-structured (Mg 1-x Zn x )(Ga 2-y In y )O 4
ceramics with low dielectric loss
LUNCH & POSTER SESSION*
12:30 - 14:30
14:30 -
FREE
*POSTER PRESENTATIONS, 12:30 - 14:30, Snake/Payette
Ratiba Benzerga, Institut d’Electronique et de
Télécommunications de Rennes (IETR), Equipe Carbon fibers loaded polymer foams for microwave absorption
Matériaux Fonctionnels
Ratiba Benzerga, Institut d’Electronique et de
Miniaturized and reconfigurable notch antenna based on BST thin
Télécommunications de Rennes (IETR), Equipe
film
Matériaux Fonctionnels
Wei-Ting Chen, Penn State University
Wei-Ting Chen, Penn State University
Claire Le Paven, Université de Rennes
E.A. Nenasheva, GIRICОND Research Institute
E.A. Nenasheva, GIRICОND Research Institute
Page 6
Improvement on the continuity of Cu inner electrode of
(Ba,Ca)(Ti,Zr)O3 multilayer ceramic capacitors by a novel sintering
Improved on sintering condition of lead-free piezoelectric
ceramic NKN material system by doping LiNbO3 and Li2CO3
Sr-Ta-based oxide and oxynitride perovskite-type dielectric thin
films deposited by RF reactive magnetron sputtering
Microwave ceramics materials based on solid solutions in
systems ZnTa 2O6-MeO2 (Me=Ti, Zr)
Microwave microstrip pseudocombline filters with stepped
impedance resonators based on substrates with high permittivity
Hirotaka Ogawa, Meijo University
Low-temperature sintering of spinel-structured MgGa2O4 ceramic
by B2O3 addition
Marcin Słoma, Warsaw University of
Technology
Methods of nanotube dispersion in printed composite layers for
enhancing electrical properties in GHz range
Marcin Słoma, Warsaw University of
Technology
Wideband and thin microwave absorber with inhomogeneous
resistive sheet made of ink with graphene nanoplatelets
Susumu Takahashi, Meijo University
Dielectric and thermal properties of hexagonal boron nitride and
magnesium oxide filled polymer composites
Xinye Yang, Tsinghua University
Xiaohua Zhang, Tsinghua University
Effect of MgO on microstructure and microwave dielectric
properties of 0.84CaTiO3-0.16Sm0.9Nd0.1AlO3 ceramics
Structure, microwave dielectric properties and thermally
stimulated depolarization currents of
Conference Program
Tuesday
8:30 - 9:00
3 June 2014
Session
Session Chair
Location
Plenary
Xiang Ming Chen, Zhejiang University
Summit
James Booth, NIST
Session
Session Chair
Location
LTCC & Films
Hong Wang, Xi-an Jiaotong University
Summit
9:10 - 9:35
Invited
Steve Dai, Sandia National Lab
9:35 - 9:50
Contributed
Claire Le Paven, Université de Rennes
9:50 - 10:05
Contributed
Heli Jantunen, University of Oulu
10:05 - 10:30
Invited
Tseung-Yuen Tseng, National Chiao Tung
University
Location
Snake/Payette
Session
Session Chair
Location
LTCC
Steve Dai, Sandia National Lab
Summit
11:00 - 11:25
Invited
Jiang Jian Bian, Shanghai University
Lithium containing glass-free LTCC
microwave materials
11:25 - 11:50
Invited
Hong Wang, Xi-an Jiaotong University
11:50 - 12:05
Contributed
Maciej Sobocinski, EMPART, Infotech Oulu
Location
Ste. Chapelle Winery, 19348 Lowell Rd, Caldwell, Idaho 83607
Location
CONFERENCE BANQUET
Skyline Room, Stueckle Sky Center, Bronco Stadium, Boise State University, 1910 University Drive, Boise, Idaho 83725
4 June 2014
Session
Session Chair
Location
Plenary
Danilo Suvorov, Jozef Stefan Institute
Summit
David Cruickshank, Trans-Tech Inc.
Session
Session Chair
Location
Antennae
Heli Jantunen, University of Oulu
Summit
9:40 - 10:05
Invited
Jari Juuti, University of Oulu
Liquid crystal polymer and its composites
as a tunable substrate material for
microwave frequencies
10:05 - 10:20
Contributed
Marcin Słoma, Warsaw University of
Technology
Influence of particle shape on electric
properties of printed dielectric layers
Plenary Session
Broadband characterization of nonlinear dielectric thin films and devices
Bandpass filters with localized temperature
compensation in LTCC
Functional dielectric oxide and oxynitride
perovskite thin films deposited by reactive
magnetron sputtering
Investigations of low temperature co-fired
M-type barium hexaferrites and BaO-(Nd 1dielectric ceramics
x Bi x ) 2 O 3 -4TiO 2
ZrO2 thin films for resistive switching
memory applications
BREAK
10:30 - 11:00
Session
Session Chair
Location
Extrinsic Loss Mechanisms
Xiang Ming Chen, Zhejiang University
Salmon
11:00 - 11:25
Invited
Taras Kolodiazhnyi, National Institute for
Materials Science
Extrinsic dielectric loss in single phase,
atomically ordered Ba(Mg 1/3 M 2/3 )O 3
where M = Nb, Ta
Novel LTCC dielectrics for passive
integration
11:25 - 11:40
Contributed
Jie Zhang, Tsinghua University
Microwave dielctric loss mechanism in
xMgTiO 3 -(1-x)Ca 0.8 Sr 0.2 TiO 3 ceramics
Decreasing the relative permittivity of LTCC
by porosification with the use of
poly(methyl methacrylate) microspheres
11:40 - 11:55
Contributed
Lei Li, Zhejiang University
Frequency-dependent Qf value of
microwave dielectric ceramics
BOX LUNCH & WINERY TOUR
12:05 - 19:00
19:00 - 22:00
Wednesday
9:00 - 9:30
Plenary Session
10:20 - 10:35
Contributed
Tuomo Siponkoski, University of Oulu
10:35 - 10:50
Contributed
Ratiba Benzerga, Université de Rennes 1
10:50 - 11:15
Invited
Merja Teirikangas, University of Oulu
Location
Snake/Payette
Session
Session Chair
Location
Ferrites & Absorption
Jörg Töpfer, University of Applied Sciences Jena
Summit
11:30 - 11:55
Invited
Robert Pullar, University of Aveiro
11:55 - 12:20
Invited
Piyi Du, Zhejiang University
12:20 - 12:35
Contributed
Ratiba Benzerga, Université de Rennes 1
12:35 - 13:15
Session
Session Chair
Location
Plenary
Rick Ubic, Boise State University
Summit
Heli Jantunen, University of Oulu
Location
Snake/Payette
Enhanced dielctric constant microwave garnets for miniaturized isolator and circulator devices
All-printed frequency tunable antenna with
lead-free piezoelectric ink
La 2 Ti 2 O 7 perovskite compound: from the
thin film deposition to the notch antenna
miniaturization
Advanced magneto-dielectric composite
material for antenna miniaturisation
Session
Session Chair
Location
Ferrites & Memory
Robert Pullar, University of Aveiro
Salmon
9:40 - 10:05
Invited
Jörg Töpfer, University of Applied Sciences
Jena
10:05 - 10:20
Contributed
10:20 - 10:35
Invited
Integration of high-frequency ferites into
LTCC modules: cofiring strategies and
magnetic properties
A study of the stress induced during the
Wei-Ting Chen, Penn State University
construction and manufacturing of chip
inductors
Yang Bai, University of Science and Technology Exotic electromagnetic properties in ferriteBeijing
metal cofired ceramic composites
BREAK
11:15 - 11:30
Magnetoelectric composite ceramics based
on M- or Z-type hexaferrites with BaTiO 3
or KNN (KNbO 3 -NaNbO 3 )
Ion doped ferrite BaFe 12 O 19 with
extraordinary microwave absorption
properties
Recycled glass based foams for microwave
applications
Session
Session Chair
Location
Piezoelectrics
Rick Ubic, Boise State University
Salmon
11:30 - 11:45
Contributed
Wei-Ting Chen, Penn State University
New type Aurivillius structure lead-free
ceramics (Na,K)Bi 5 Ti 5 O 18 by synthesis of
original compound (Na,K) 2 CO 3
12:15 - 12:30
Contributed
Srečo Škapin, Jozef Stefan Institute
Dielectric ceramics in various ternary
La 2 O 3 -TiO 2 -MO systems
12:00 - 12:15
Contributed
Kevin Tolman, Boise State University
Effective vacancy size in lead lanthanum
zirconate titanate
Plenary Session and Conference Close
Geopolymer properties at microwave frequencies
LUNCH
13:20- 14:15
Page 7
Conference Venue
MMA 2014 will be held at the Boise Centre in Boise, Idaho USA.
850 W. Front Street
Boise, ID 83702
Boise Centre is located in the heart of downtown Boise, which is located in the Southwestern portion of
Idaho. Boise is the State Capital of Idaho. Idaho is located in the Pacific Northwest and borders Washington
and Oregon.
Directions
From the Airport
Travel north on Vista Avenue for approximately 2 miles, you will loop around the historic Boise Train Depot, and will continue on as Vista turns into Capitol Boulevard. In approximately one mile, you will turn left
on Front Street; go one block to the corner of 9th and Front Streets. The Boise Centre is on the right.
From I-84 West
1. From I-84 take exit 1A-49 on the left for I-184/Franklin Rd. - 0.6 mi
2. Merge onto I-184 E - 4.2 mi
3. Continue onto W. Myrtle St. - 0.4 mi
4. Turn left onto S. Capitol Blvd.. - 0.1 mi
5. Take the 2nd left onto W. Front St. - Boise Centre will be on the right.
From I-84 East
1. From I-84 take exit 53 for Vista Avenue toward Boise Airport - 0.2 mi
2. Turn right onto Vista Ave - 2.1 mi
3. Continue onto S Capitol Blvd. - 1.0 mi
4. Turn left onto W Front St - Boise Centre will be on the right
Page 8
Conference Venue
Front Street
Page 9
Cultural Tour and Reception
Boise Historical Trolley Tour
All participants are welcome to join us for a quaint historical trolley tour on Sunday June 1, 2014 at 3:45
p.m. Meet at the Boise Centre to board to Trolley. The 45 minute tour takes you through the following
downtown Boise areas:
• Historical Basque Block - Numbering about 15,000, Boise’s Basque community is one of the largest
such communities in the United States. Boise area Basques are very proud of their unique heritage
like all other Basque communities, but the Boise and Treasure Valley Basques have a unique area to
call their own - The Basque Block!
• Mansions on Warmsprings Avenue - This tree-filled avenue is home to some of Boise’s first houses
done in a graceful late 1800s architecture. Located near downtown Boise, these elegant mansions
were the first in the United States to be geothermally heated. The oldest home, built in 1868, is at
1035 Warm Springs Avenue. All of the homes are private and are not open for tours.
• Hyde Park - Hyde Park is on the National Historic Register for several reasons. First, the building
and architecture of the areas is unique. Secondly, a “sub” urban retail area of the age of Hyde Park is
unusual for any community. It rivals such famous areas like the Niles District in Oakland for its character and quality. Every day in Hyde Park is filled with activity. It has become the official mountain
and touring bike headquarters of the Treasure Valley.
• The Old Idaho Penitentiary - The Old Idaho Penitentiary opened its doors in 1872 to some of the
West’s most desperate criminals. Today, visitors can experience over 100 years of Idaho’s unique
prison history with a visit to Solitary Confinement, cell blocks, and the
Gallows. The Old Idaho Penitentiary features thirty historic buildings and
special exhibitions including the J. Curtis Earl Memorial Exhibit of Arms
and Armaments.
• Fort Street on the east end of Boise - The East End Historic District is a
thirty nine block residential neighborhood of predominantly single family dwellings. The most rapid growth in the district occurred in the first
ten years of the twentieth century, extending to 1940. The predominant
architectural style in the district is the Craftsman bungalow, represented by
127 homes or 29 percent. There are a mix of other styles present including Queen Anne cottages, American foursquare, and a handful of Mission
Revival/Spanish eclectic.
Reception
All participants are welcome to join us for the conference reception. The reception will be held on Sunday June 1, 2014 at 6 p.m. in the Snake/Payette Room at the Boise Centre. Enjoy complimentary hors
d’oeuvres, beer, wine, and mixed drinks. Visit with colleagues and enjoy a beverage before moving on to
dinner on your own for the evening.
Page 10
Winery Tour and Banquet
Ste. Chapelle Winery Tour
On Tuesday June 3, 2014 at 12 noon, conference participants will pick
up a box lunch and board a bus for a 45 minute ride to Ste. Chapelle
Winery. From high atop “Winery Hill,” Ste. Chapelle Winery overlooks
thousands of acres of fertile orchards and farmland in Southwestern
Idaho known as Sunny Slope, with the famous Snake River winding
through the valley below.
Founded in 1976 by the Symms family, Ste. Chapelle Winery is named
after the beautiful La Sainte Chapelle in Paris, built by King Louis IX as
the court chapel during the 13th century. The winery tasting room follows the airy feel of La Sainte Chapelle with its high, bright cathedralstyle windows, vaulted ceilings with wooden beams and a stained glass
grapevine window greeting its visitors. Enjoy wine tasting, light snacks, and a tour of the wine making
operation while strolling the beautiful Ste. Chapelle Winery grounds.
The bus will board for return to Boise at 5 p.m. Guests will be transported directly to the Stueckle Sky
Center for the conference banquet.
Conference Banquet
After enjoying a beautiful day at Ste. Chapelle Winery, conference participants will board the bus back to
Boise at 5 p.m. The bus will transport guests directly to the Stueckle Sky Center for the conference banquet, which begins with cocktails at 6 p.m. Guests who are not attending the Winery tour can take public
transportation to the Stueckle Sky Center on the Boise State campus to join us for the banquet.
Boise State University’s Stueckle Sky Center, one of the premier entertainment and sporting venues in
the West, overlooks the world famous Blue Turf of Bronco
Stadium. Named for University benefactors Duane and Lori
Stueckle, the four level facility includes loge boxes, club seating, sky suites and media operations for Boise State football.
Enjoy fabulous views of the entire city from the Skyline Room.
Cocktails are available at 6 p.m. Guests can board the bus back
to the Boise Centre after the banquet at 10 p.m.
Page 11
About Boise
Located in the valley dubbed “Les Bois” by French pioneers, Boise is Idaho’s capital and largest metropolitan area, serving as the government, business, high-tech, economic, and cultural center of the state.
Located along the foothills of the Rocky Mountains, Boise has a vibrant center offering art and fine
dining, and it is convenient for outdoor recreation all year round.
Downtown Boise offers a variety of great restaurants, both locally-owned and national retail shops,
several movie theatres and more. Downtown Boise is home to the Basque Block where you’ll find the
Basque cultural center, Basque restaurants and the Basque Museum. Cultural opportunities abound at
the Flicks Theatre, Ballet Idaho, and numerous venues that host concerts year-round.
The Boise Greenbelt is a 23-mile, tree-lined path that follows the Boise River through the heart of
town. The Boise Greenbelt passes through many of the city’s most spectacular parks including Julia
Davis Park, Ann Morrison Park, Kathryn Albertson Park, Esther Simplot Park, and Veteran’s Memorial
Park. The Greenbelt also offers access to the Idaho Shakespeare Festival which offers theatre under the
stars all summer long.
The Boise River is a favorite for locals and visitors alike! Hot summer days offer the chance to cool off
by floating the river in an inner tube or raft. More daring individuals can venture north of the city to the
Payette River where Class II-V whitewater awaits! For a nice soak in a natural hot springs resort head
to historic Idaho City and soak at the Springs.
Julia Davis Park, just across the Boise River from Boise State University, which is home to the Boise
Art Museum, the Idaho State Historical Museum, Zoo Boise, Discovery Center of Idaho, and the Idaho
Black History Museum.
The Boise foothills offer over 130 miles of well-maintained trails through the Ridge to Rivers program
for everything from hiking to
mountain biking and horseback riding. Access to many
of the trails is just miles from
downtown Boise.
Beyond Boise, you will find
quality golf courses, the World
Center for Birds of Prey, Idaho
Ice World, the Meridian Speedway, Bogus Basin Mountain
Resort,Tamarack Ski Resort,
Lake Lowell National Wildlife
Reserve and The historic Idaho
State Penitentiary.
Page 12
Invited Speakers
The following invited speakers have confirmed their participation in MMA 2014:
Yang Bai, University of Science and Technology Beijing
Exotic electromagnetic properties in ferrite-metal cofired ceramic composites
Jiang Jian Bian, Shanghai University
Lithium containing glass-free LTCC microwave materials
James Booth, National Institute of Standards and Technology
Broadband characterization of nonlinear dielectric thin films and devices
David Carey, University of Surrey
High Frequency Characterisation of Graphene, Carbon Nanotubes and Nanometals
Xiang Ming Chen, Zhejiang University
Order/disorder transition, domain structure and microwave dielectric characteristics of
Ba((Co0.6Zn0.4)1/3Nb2/3)O3-based ceramics
Dave Cruickshank, Skyworks Solutions
Enhanced Dielectric Constant Microwave Garnets for Miniaturized Isolator and Circulator Devices
Steve Dai, Sandia National Laboratories
Bandpass Filters With Localized Temperature Compensation in LTCC.
Heli Jantunen, University of Oulu
Geopolymer properties at microwave frequencies
Jari Juuti, University of Oulu
Liquid crystal polymer and its composites as a tunable substrate material for microwave frequencies.
Eung Soo Kim, Kyonggi University
Enhanced Quality Factor of Wollastonite Glass-Ceramics by Heat-Treatment Method
Taras Kolodiazhnyi, National Institute for Materials Science
Extrinsic dielectric loss in single phase, atomically ordered Ba(Mg1/3M2/3)O3 where M = Nb, Ta.
Sahn Nahm, Korea University
Synthesis and Microwave Dielectric Properties of Bi8TiO14 Ceramics
Hitoshi Ohsato, Nagoya Industrial Science Research Institute
Millimeter-wave dielectrics with low permittivity for radar and wireless communications
Rob Pullar,Universidade de Aveiro
Magnetoelectric Composite Ceramics based on M or Z-type Hexaferrites with BaTiO3 or KNN
(KNbO3-NaNbO3)
Danilo Suvorov, Institut “Jožef Stefan”
Transient Microstructures in Complex-Perovskite-Based Microwave Dielectrics
Jörg Töpfer, Ernst-Abbe-Fachhochschule Jena
Integration of high-frequency ferrites into LTCC modules: cofiring strategies and magnetic properties
Tseung-Yuen Tseng ,National Chiao Tung University
ZrO2 thin films for resistive switching memory applications
Hong Wang, Xi’an Jiaotong University
Novel LTCC Dielectrics for Passive Integration
Page 13
Plenary Presentations
High Frequency Characterisation of Graphene, Carbon Nanotubes and
Nanometals
J David Careya*
a
Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, United Kingdom
*Corresponding author. Tel. +44 1483 68089, David.Carey@surrey.ac.uk
Abstract
Carbon-based nanomaterials, such as graphene and nanotubes (CNTs), possess advantageous
properties such as excellent dc electrical conductivity and mechanical robustness. Advances in
chemical functionalization and processing allow for incorporation in hybrid structures, such as
composites, and for tailoring of their electronic properties. However, to date their microwave and
high frequency characteristics are not well studied. Here we discuss the characterisation of CNT
- polymer composite coplanar waveguides (CPWs) at frequencies up to 220 GHz and compare
the results with CPWs made from nano- and micron-sized silver. In the case of the CNT
composites the importance of capacitive coupling between nanotubes, or bundles of nanotubes,
with the polymer material will be highlighted. In the case of graphene, the factors which affect
the conductivity of doped graphene. Potential high frequency applications of graphene and CNTs
will also be discussed.
Notes
Page 14
Plenary Presentations
Broadband Characterization of Nonlinear Dielectric Thin Films and Devices
James C. Bootha*, Nathan D. Orloff a , Yu Wanga, Alberto Padillab, Eduard Rocasb, Jordi Mateub,
and Carlos Colladob
a
Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO
80305, USA
b
Department of Signal Theory and Communications, Universitat Politècnica de Catalunya,
Barcelona, Spain
*Corresponding author. Tel. +1 303 497 7900, booth@boulder.nist.gov
Abstract
We present results of our broadband technique to measure the linear and nonlinear dielectric
properties of thin films and devices at frequencies up to 110 GHz. We use wafer-probe
calibrations and measurements of ensembles of planar devices, along with detailed finite-element
simulations, in order to extract the frequency-dependent material properties of thin-film materials
over a wide range of experimental variables, including temperature, electric field bias, and ingrown strain. We demonstrate application of our measurement technique to two different
microwave material systems: strained Ruddlesden-Popper Sr(n+1)Ti(n)O(3n+1) thin films, and
AlN bulk acoustic wave resonators. Results for the strained Ruddlesden-Popper materials show
that the dielectric properties depend sensitively on the series number n, with ferroelectricity
emerging for n>3 as predicted by ab-initio calculations. For the AlN BAW devices, we show that
the dependence of the resonant frequency on voltage is directly related to the nonlinear
harmonics measured in the devices at microwave frequencies.
Notes
Page 15
Plenary Presentations
Enhanced Dielectric Constant Microwave Garnets for Miniaturized Isolator
and Circulator Devices
David Cruickshanka, Michael Hilla* and Iain MacFarlaneb
a
Trans-Tech Inc. (A subsidiary of Skyworks Solutions Inc.) , 5520 Adamstown Rd., Adamstown
MD 21710, USA
b
Skyworks Ireland, #3A Eastgate Road, Eastgate, Littleisland, Cork, Ireland
*Corresponding author. Tel. +1 301 874 6422, mike.hill@skyworksinc.com
Abstract
Novel magnetic garnets based on the system Bi1.4Y1.6-x-2yCa(x-2y)Fe5-x-y-zZrxVyAlzO12 enable the
miniaturization of isolator and circulator designs based on the higher dielectric constant of the
bismuth based ferrite relative to the yttrium based counterparts. Although bismuth based
magnetic garnets have been known for some time, these current compositions and novel
processing techniques allow for much lower dielectric and magnetic losses than had been
previously reported for bismuth containing garnets. The dielectric constant of the bismuth
substituted garnets is close to 30 as compared with dielectric constants near 15 for the bismuth
free material. These materials may be modified by vanadium and aluminum doping to achieve a
range of saturation magnetizations from 1900 to 400 gauss. This enables a range of devices to be
manufactured including below resonance isolators and tuneable filters.
Notes
This is an invited presentation for David Cruickshank, who would be presenting this work. He
currently is a retired consultant working with Trans-Tech and Skyworks, Ireland. Due to his
travel schedule, M. Hill would be the corresponding author.
Page 16
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Plenary Presentations
Geopolymer properties at microwave frequencies
Jari Juutia, Sanna Tynib, Maria Väätäjäb Minna Tiainenb, Risto S. Laitinenb, Heli Jantunena*
a
Microelectronics and Materials Physics Laboratories, University of Oulu, Oulu, P.O.Box 4500,
Finland
b
Department of Chemistry, University of Oulu, Oulu, P.O.Box 3000, Finland
*Corresponding author. Tel. +358 40 512 0861, heja@ee.oulu.fi
Abstract
In this paper, one of the first studies of dielectric properties of geopolymers and their composites
are made at the GHz regime. Geopolymers are a fairly unknown group of inorganic polymers
where e.g. tri-dimensional aluminosilicates are formed at low temperatures (25-85 °C) during
short time of heating. These aluminosilicate polymers form a network consisting of SiO4 and
AlO4 tetrahedra linked by sharing all oxygen atoms. Such materials can tolerate extreme
temperatures and can obtain significantly higher permittivity than their organic counterparts.
Geopolymers and geopolymer-ceramic composites with different ceramic loading levels were
realized on a glass substrate and measured with an Agilent impedance analyzer and SPDR. Even
in the case of only partially polymerized samples r~3.9-6.3 and ~3-4 at 10 MHz and 1 GHz were
obtained, respectively. Promising results foster new development branch in the field of microwave
materials and their utilization in applications of printed electronics.
Notes
Page 17
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
Invited Presentations
Millimeter-wave dielectrics with low permittivity for radar and
wireless communications
Hitoshi OHSATO a,b* and Isao KAGOMIYAc
a
Department of Research, Nagoya Industrial Science Research Institute, Chikusa-ku, Nagoya
464-0819, Japan
b
Incubation Center, c Department of Material Science and Engineering, Nagoya Institute of
Technology, Showa-ku, Nagoya 466-8555, Japan
*Corresponding author. Tel.&Fax +81 52 735 7511, ohsato.hitoshi@nitech.ac.jp
Abstract
Millimeter-wave wireless communications in highly informative society have been growing up
on high density data transfer and radar for Pre-Crash Safety System. On these communications,
millimeter-wave dielectrics have been expected on the development of substrates with high
quality factor (Qf), low dielectric constant (εr), and near zero temperature coefficient of
resonance frequency (TCf). As high frequency such as millimeter-wave causes high dielectric
losses, the dielectrics should be high Qf. And as millimeter-wave is short for fabrication of
devices, they should be low εr. Silicates are suitable for millimeter-wave dielectrics because of
their low εr depending on the crystal structure consists of silicon tetrahedron SiO4 with 50%
covalency. We have been studying several silicates such as forsterite, willemite, diopside,
wollastonite, and cordierite/indialite glass ceramics. And LTCC of indialite is also studying now.
In this paper, these millimeter-wave dielectrics and LTCC of indialite are presented.
Notes
Page1 18
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
as the main, affiliation address.
Invited Presentations
Transient Microstructures in Complex-Perovskite-Based Microwave
Dielectrics
Danilo Suvorova *, Boštjan Jančara
Advanced Materials Department, Jozef Stefan Institute, Jamova 39, 1001 Ljubljana, SLOVENIA
*Corresponding author. Tel.: (+386) 1 477 3871, danilo.suvorov@ijs.si
a
Abstract
It has been known for decades that Ba 3’ ’’2O9 –type (’=Zn or Co and ’’=Ta or Nb) complex
perovskites exhibit high quality factors at microwave frequencies which prompted their use as
dielectric resonators in base stations of wireless communication systems. Furthermore it has been
established that degree of order of octahedrally coordinated  cations along the cubic close-packed
direction strongly influences the dielectric response of these materials. Higher degree of 1:2 order
in Ba3’ ’’2O9 compounds results in higher quality factors which in turn results in higher
frequency selectivity. The cation ordering kinetics is relatively slow and usually requires long
annealing time at elevated temperature, which often affects economic viability. Shortening of
processing time for achieving high-Q state has thus been subject of extensive research.
We found that ’-site cation deficiency increases the stability range of 1:2 ordered state and
significantly speeds-up the cation ordering process in the case of Ba 3 CoNb2O9. Characterization
of microwave dielectric properties showed that Q-value increases with the increase in Codeficiency and reaches a maximum value at the composition Ba 3Co0.93Nb2O 9 which is beyond the
homogeneity range of Ba 3Co1-xNb2O 9-x. Electron microscopy revealed that Co-deficiency
exceeding homogeneity range causes formation of coherently ingrown hhc…c type sequences in
the direction of cubic close packing within the perovskite grains. Such intergrowths can be
interpreted as ordering of vacancies not accommodated by the cubic perovskite matrix. The
microstructures containing coherently intergrown hexagonal stacking sequences also occur as a
transient phase during the solid-state formation of 8L Ba8CoNb6O24 . The influence of such
coherent intergrowths between cubic and shifted hexagonal perovskite phases on microwave
dielectric properties of Ba3CoNb2O9 – Ba5Nb4O 15 binary system will be discussed.
Notes
Page 19
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
1
Invited Presentations
Enhanced Quality Factor of Wollastonite Glass-Ceramics by Heat-Treatment
Method
Sung Wook Jang and Eung Soo Kim*
Department of Materials Engineering, Kyonggi University, Suwon, Korea
*Corresponding author. Tel. +82 31 249 9764, eskim@kyonggi.ac.kr
Abstract
Effect of heat-treatment method on the microwave dielectric properties of wollastonite
(0.9Ca0.9Mg0.1SiO3-0.1CaMgSi2O6) glass-ceramics was investigated. The glass powders were
prepared by single and/or stepped quenching process. Single phase of β-wollastonite was
obtained for the specimens heat-treated at 900oC for 3h from the glass powders prepared by the
stepped quenching, which showed the higher quality factor (Qf) than that of single quenching. To
improve the degree of crystallization, the stepped quenching glass powders were heat-treated by
two-step method, which included the nucleation and crystal growth steps. With increasing
holding time at nucleation temperature (Tn,, 725oC), the Qf of the specimens was improved due
to the increase of the degree of crystallization. The enhanced quality factor (51,000GHz) and
degree of crystallization were obtained for the specimens heat-treated at 725oC for 7h and
crystallized at 900oC for 3h. The dependence of dielectric constant (K) and temperature
coefficient of resonant frequency (TCF) on crystallization behavior was also discussed.
Notes
Page 20
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Invited Presentations
Synthesis and Microwave Dielectric Properties of Bi8TiO14 Ceramics
Sahn Nahma,b,c,*, Mi-Ri Jounga, Byoung-Jik Jeonga, and Jin-Seong Kima
a
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Republic
of Korea
b
Department of Nano-Semiconductor Engineering, Korea University, Seoul 136-701, Republic
of Korea
c
KU-KIST Graduate School of Conversing Science and Technology, Korea University, Seoul
136-701, Republic of Korea
*Corresponding author. Tel. +82-2-3290-3279, snahm@korea.ac.kr
Abstract
The formation of a homogeneous Bi8TiO14 phase was successfully achieved in a specimen
calcined at 600oC. However, a Bi4Ti3O12 secondary phase also developed in specimens calcined
at temperatures higher than 600oC, probably because of Bi2O3 evaporation. For specimens
sintered above 800oC, a small amount of the Bi8TiO14 phase melted during sintering, with the
liquid phase contributing to the densification of the specimens; however, Bi4Ti3O12 and
Bi12TiO20 secondary phases were still formed in these specimens. The microwave dielectric
properties of the Bi8TiO14 phase were considerably affected by variations in the microstructure
of the specimens. When the sintering temperature exceeded 825oC, the amount of secondary
phases increased, and this decreased the density and Q×f values of the specimens. Bi8TiO14
ceramics sintered at 825oC exhibited promising microwave dielectric properties, with εr = 47.4,
Q×f = 5,370 GHz, and τf = -16.01 ppm/oC.
Notes
Page 21
Invited Presentations
Order/disorder transition, domain structure and microwave dielectric
characteristics of Ba((Co0.6Zn0.4)1/3Nb2/3)O3-based ceramics
Xiang Ming Chen* and Pian Pian Ma
Department of Materials Science and Engineering, Zhejiang University, 38 Zheda Road,
Hangzhou 310027, China
*Corresponding author. Tel. +86 571 8795 2112, xmchen59@zju.edu.cn
Abstract
Effects of Mg-substitution and post-densification annealing on order/disorder transition, domain
structure and microwave dielectric characteristics of Ba((Co0.6Zn0.4)1/3Nb2/3)O3 ceramics have
been investigated. The ordered complex perovskite structure is obtained in Ba((Co0.6-x/2Zn0.4x/2Mgx)1/3Nb2/3)O3 ceramics (x = 0, 0.1, 0.2 and 0.3), and the ordering degree in the as-sintered
ceramics increases with increasing x. The significantly improved Qf value is obtained in the
present ceramics with increasing x, while r decreases slightly together with some increase of f.
The best combination of microwave dielectric characteristics is obtained for x = 0.3: r = 33.7, Qf
= 93 800 GHz and f = 9.6 ppm/oC. Long-time annealing at temperatures below the orderdisorder transition temperature enhances the cation ordering degree and promotes the domain
growth. As the annealing temperature increases close to the transition temperature, coarse
ordering domains with high-energy boundaries are formed, and then the Qf value steadily
decreases because of the inferior domain structure.
Notes
Page 22
Invited Presentations
Bandpass Filters With Localized Temperature Compensation in LTCC
Steve Daia and Lung-Hwa Hsiehb
a
Materials Sciences and Engineering Center, Sandia National Laboratories, Albuquerque, NM
87185, USA
b
RF and Electronic Systems Center, Sandia National Laboratories, Albuquerque, NM 87185,
USA
Abstract
A series of SrTiO3 (STO) based temperature compensation dielectrics that were cofireable with
the commercial DuPont 951 low temperature cofireable ceramic (LTCC) were developed. The
STO30 dielectric with 30 wt% STO showed the highest positive temperature coefficient of
resonant frequency (f) that was opposite to the f = -69 ppm/ºC of the 951 LTCC, and was
selected to design a temperature-compensated four-pole bandpass filter (BPF). The filter showed
a near zero f = 0.7 ppm/°C over a temperature range -20 ºC to 80 ºC. A general variational
method with the transmission-line technique provided an analytical method to calculate the
effective dielectric constant and the characteristic impedance of an arbitrary multilayer strip line
structure. With this method, the thickness of STO30 compensation dielectric can be optimized to
obtain a nearly full temperature compensation for the filter. The simulated electro-magnetic filter
responses agreed well with measured data.
Notes
Page 23
Invited Presentations
ZrO2 thin films for resistive switching memory applications
Tseung-Yuen Tseng*
Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300,
Taiwan
*Corresponding author. Tel. +886 3 5731879, tseng@cc.nctu.edu.tw
Abstract
A metal-oxide-metal structure-based resistive random access memory device has
attracted much attention for next-generation high-density and low-cost nonvolatile
memory applications due to its long data retention, simple structure, high-density
integration, low-power consumption, fast operation speed, high scalability, simple
constituents, and easy integration with the standard metal oxide semiconductor
technology. ZrO2 thin films exhibit very good resistive switching properties. This talk
reports the recent works in our Laboratory about technological aspects of ZrO2 thin
films, including thin film deposition, post annealing, physical and electrical
characteristics of the films, effect of electrode, effect of composition, retention time
and endurance of switching memory related properties. In addition, possible future
developments are briefly summarized.
_____________________________________________________________________
Notes
Page 24
Invited Presentations
Lithium containing glass-free LTCC microwave materials
J.J. Bian
Department of Inorganic Materials, Shanghai University, Shanghai 200444, China
Email: jjbian@shu.edu.cn
Abstract
Reducing the sintering temperature without affecting the properties is a
challenging problem in LTCC material research. Addition of low melting glass either
leads to poor microwave dielectric properties or significantly increases the possibility
of chemical interaction with the metal electrode due to the presence of complicated
phases in the LTCC system. So, a glass-free LTCC material with appropriate
microwave dielectric properties is strongly desired for the multilayer structure
applications. We designed several lithium containing glass-free LTCC materials with
good microwave dielectric properties in this paper. Their chemical compatibilities
with Ag or Cu were also studied.
Notes
Page 25
Invited Presentations
Novel LTCC Dielectrics for Passive Integration
Hong Wang a*
a
Electronic Materials Research Laboratory, Key Laboratory of Ministry of Education, Xi’an
Jiaotong University, Xi’an 710049, China
*Correspondingauthor. Tel. +86 29 8266 9012, hwang@mail.xjtu.edu.cn
Abstract
With the rapid development of wireless hand-held devices, the needs for passive component
devices working in microwave range with enhanced reliability, miniaturization and electrical
performance are increasing fast. Low temperature cofiring ceramic (LTCC) provides one of good
solutions for integrating the passive components as a functional module for microwave
applications. Novel dielectric ceramics with the sintering temperature lower to 460C to 600C
have been systematically obtained and studied. The mechanism of microwave dielectric response
was studied and the contribution of intrinsic and extrinsic dielectric loss was revealed. Ion
substitutions can tailor the dielectric properties effectively. A series of medium and high K
LTCC dielectrics were developed to be cofired with silver or copper or alumimum electrodes.
Co-firing of LTCC dielectrics with different permittivities were studied and it contributes to
further functional integration of microwave devices. Finally prototype LTCC devices have been
demonstrated.
References
[1] G. Q. Zhang, J. Guo, L. He, D. Zhou, H. Wang, J. Koruza, M. Kosec. J. Am. Ceram. Soc., 97 (1), 241-245
(2014)
[2] J. Guo, D. Zhou, L. Wang, H. Wang, T. Shao, Z.M. Qi, X. Yao. Dalton Trans., 42(5), 1483-91 (2013)
[3] D. Zhou, C.A. Randall, H. Wang, L.X. Pang, X. Yao. J. Am. Ceram. Soc., 93 (4), 1096-1100 (2010)
[4] D. Zhou, H. Wang, L.X. Pang, C. A. Randall, X. Yao. J. Am. Ceram. Soc., 92 (10), 2242-2246 (2009)
[5] H. Wang, S. Kamba, H. Du, C.-T. Chia, M. Zhang, S. Veljko., S. Denisov, F. Kadlec, J. Petzelt, X. Yao. J.
Appl. Phys., 100, 014105 (2006)
[6] H. Wang, S. Kamba, M. Zhang, X. Yao, S. Denisov, F. Kadlec, J. Petzelt. J. Appl. Phys., 100, 034109
(2006)
Page 26
Invited Presentations
Extrinsic dielectric loss in single phase, atomically ordered Ba(Mg1/3M2/3)O3
where M = Nb, Ta
Taras Kolodiazhnyi a*
a
National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, JAPAN
*Corresponding author. Tel. +81 29 860 4407, kolodiazhnyi.taras@nims.go.jp
Abstract
I will address the compositional stability range, microwave dielectric properties, and defect
chemistry of the title compounds within the BaO-MgO-Ta2O5(Nb2O5) ternary diagram. I will
further demonstrate that the dense, atomically ordered BaMg1/3Ta2/3O3 and BaMg1/3Nb2/3O3
ceramics show large variation of dielectric loss within a single phase composition region– a clear
message that the dielectric loss in practical ceramics is dominated by extrinsic sources and that
the cation order alone is insufficient to achieve a minimum dielectric loss in the title compounds.
The low-temperature dielectric relaxation studies point out that the extrinsic dielectric loss in the
title compounds is due to the ‘rattling’ of the off-centered Mg2+ ions misplaced at the Ba sites.
Controlled deviation from the BaMg1/3M2/3O3 stoichiometry toward the Mg-deficient region
leads to suppression of the extrinsic dielectric loss as a result of the reduced chemical activity of
Mg ion.
Notes
Page 27
Invited Presentations
Liquid crystal polymer and its composites as a tunable substrate material for
microwave frequencies
Jari Juutia*, Merja Teirikangasa, Heli Jantunena
a
Microelectronics and Materials Physics Laboratories, University of Oulu, Oulu, P.O.Box 4500,
Finland
*Corresponding author. Tel. +358 294 48 2714, jajuu@ee.oulu.fi
Abstract
Liquid crystal polymers (LCP) have been recently envisioned as a reconfigurable material for
microwave and millimeter-wave applications. Wide range of integration possibilities,
permittivity tuning and transparency are some of the desired characteristics that LCP can fulfill.
In this paper, injection molded LCP and its composite with different level of ceramic filler was
realized and their dielectric properties were characterized from 1 MHz to 1 GHz as a function of
bias electric field. For pure polymer, about 7 % change in permittivity was obtained with 6 V/µm
electric field at 1 GHz while tan  decreased ~11 % at the same time. Added filler increased
significantly initial permittivity allowing wide range of possibilities for static and active tuning
of the materials according to application requirements such as antennas.
Notes
Page 28
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
Invited Presentations
Advanced magneto-dielectric composite material for antenna miniaturisation
Merja Teirikangasa, Jari Juutia, Heli Jantunena*
a
Microelectronics and Materials Physics Laboratories, University of Oulu, Oulu, P.O.Box 4500,
Finland
*Corresponding author. Tel. +358 294 48 2710, merja@ee.oulu.fi
Abstract
Magneto-dielectric materials with matching permeability and permittivity have significant
advances for miniaturization and efficiency improvement of antennas. Main requirement for this
kind magneto-dielectric material is the matching of permittivity and permeability combined with
low magnetic and dielectric losses at desired frequency. To meet these requirements is
challenging, especially in high frequencies where magnetic properties are reduced due cut off
frequency. In this paper, to match the permittivity and permeability a composite material with
thermoplastic polymer matrix with ceramic fillers have been fabricated. The magnetic and
dielectric properties of composites have been altered by changing the loading ratios of dielectric
and magnetic fillers. Also the effect of adding a small amount of third filler to improve the
magnetic properties has been studied. Both the magnetic and dielectric properties have been
measured within frequency range from 1 MHz up to 1 GHz and their use in the miniaturization
of antenna is discussed.
Notes
Page 29
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
Invited Presentations
Integration
of
high-frequency
ferrites
cofiring strategies and magnetic properties
into
LTCC
modules:
Jörg Töpfera*, Silvia Bierlicha, Stefan Barthb, Beate Caprarob, Torsten Rabec, Heike Bartschd,
Jens Müllerd,
a
Department SciTec, Univ. Appl. Sciences Jena, Jena, Germany
Fraunhofer Institute of Ceramic Technology and Systems IKTS, Hermsdorf, Germany
c
Federal Institute of Materials Science and Testing, BAM, Berlin, Germany
d
Department Electrical Engineering, Technical Univ. Ilmenau, Ilmenau, Germany
*Corresponding author. Tel. +49 3641205479, joerg.toepfer@fh-jena.de
b
Abstract
Soft ferrites with adequate permeability profiles are required for the fabrication of multilayer
ferrite inductors either as monolithic passive components or integrated inductors in complex
LTCC (Low Temperature Ceramic Co-firing) modules. Matching of the shrinkage and thermal
expansion behaviors are requirements for embedded inductors through cofiring with Ag
windings at 900°C. We have studied Ni-Cu-Zn ferrites and M-type BaFe12-2yCoyTiyO19 ferrites.
The sintering behavior and magnetic properties were investigated and evaluated for multilayer
applications. Cofiring of the Ni-Cu-Zn ferrite- and LTCC tapes with silver was tested at reduced
oxygen partial pressure to reduce silver migration, but the limited stability of the ferrites limits
the pO2 of cofiring to 10-3 atm. BaFe9.6Co1.2Ti1.2O19 ferrite was cofired at 900°C and has a
permeability of µ = 20 and a resonance frequency of 2 GHz. Integration into LTCC modules is
demonstrated. Integration of uniaxial M-type ferrite for microwave applications is also tested
Notes
Page 30
Invited Presentations
Exotic electromagnetic properties in ferrite-metal cofired ceramic composites
Yang Bai*, Liang Wang, Lijie Qiao
Key Laboratory of Environmental Fracture (Ministry of Education), University of Science and
Technology Beijing, Beijing 100083, China
*Corresponding author. Tel. +86 10 6233 4493, baiy@mater.ustb.edu.cn
Abstract
The ceramic-metal composite materials have complex heterogeneous microstructure, which
endows them with exotic electromagnetic properties absent in the single-phase ceramics, such as
both high permittivity and permeability, impedance matching and both negative properties. Here,
the NiCuZn ferrite - Ag cofired ceramic composites were investigated, where the
electromagnetic properties were basically determined by ferrite matrix and the exotic properties
were modified by Ag fillers via percolation effect. The electromagnetic properties of cofired
ceramic composite is affect not only by the amount of Ag but also by its morphology, which can
be controlled by the temperature matching between the densification of ferrite and the melting of
Ag in the cofiring process. The low temperature cofired composite has equal permeability and
permittivity and ultralow loss. The composite with ultralow percolation threshold of 1.2% has
both high permittivity and permeability. The composite with Ag far beyond percolation threshold
has both negative permeability and permittivity.
Notes
Page 31
Invited Presentations
Magnetoelectric Composite Ceramics based on M or Z-type Hexaferrites with
BaTiO3 or KNN (KNbO3-NaNbO3)
Robert C. Pullar*, Marco S. A. Medeiros, João Amaral and Andrei L. Kholkin
Department of Materials and Ceramic Engineering / CICECO, University of Aveiro, Campus
Universitário de Santiago, 3810-193 Aveiro, Portugal
*Corresponding author. Tel. +351 234 370 041, rpullar@ua.pt
Abstract
Magnetoelectric materials, which exhibit both ferroelectric and ferromagnetic/piezoelectric
properties, have great promise as multifunctional materials. Here we present our latest results
on the fabrication of composite magnetoelectric microwave ceramics, and any coupling
between their magnetic and ferroelectric/piezoelectric properties. The materials studies were the
hexagonal ferrites BaFe12O19 (BaM), SrFe12O19 (SrM), Ba3Co2Fe24O41 (Co2Z) and
Sr3Co2Fe24O41 (SrZ), combined with the ferroelectrics BaTiO3 (BT) or (K/Na)NbO3 (KNN).
Various preparation methods for the hexaferrites were compared: solid state reaction,
coprecipitation, sol-gel and citrate synthesis. BT and KNN where made by standard ceramic
routes. We also studied the effects of sintering temperature, and uniaxial vs. cold isostatic
pressing, on the composites. We characterized the samples by XRD, SEM and density
measurements, and performed local piezoelectric (PFM) and both bulk (VSM) and local
(MFM) magnetic measurements. In most cases the magnetic and piezoelectric properties were
maintained, but in some composites we observed diffusion of atoms between barium and
strontium sources, producing new phases and lowering the piezoelectric effect. Although the
BT and KNN composites had maximum relative densities of only 85% and 81%, respectively,
some composites still demonstrated magnetoelectric coupling.
Notes
Page 32
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
Invited Presentations
Ion doped ferrite BaFe12O19 with extraordinary microwave absorption
properties
Piyi Du*, Chuyang Liu, Jingguo Jia, Baoyan Zhao, Ning Ma
a
Department of Materials Science and Engineering, Zhejiang University, Hanzhou, 310027,
China
*Corresponding author. Tel. +86 571 87952324, dupy@zju.edu.cn
Abstract
The emergence of electromagnetic interference (EMI), electromagnetic wave pollution and other
problems triggers extensive studies on the applications of microwave absorbing materials that
can absorb unwanted electromagnetic signals. Ferrites exhibit outstanding microwave absorption
properties and are employed broadly in military and civil fields. In this work, ion-doped barium
ferrite BaFe12O19, in which Ti, Zr, Nb or their combines were usually used as doping ions due
to their higher positively charge than that of Fe in the ferrite, was synthesized by sol-gel method.
Two natural resonance peaks appear, which can be assigned to the double values of Landé factor
g that are found to be ~2.0 and ~2.3 in the system and can essentially attributed to the existence
of Fe3+ ions and the exchange coupling effect between Fe3+ and Fe2+ ions, respectively. Such
dual resonance effect contributes a broad magnetic loss peak and thus a high attenuation
constant, and leads to a dual reflection loss (RL) peak over the frequency range between 18 and
40 GHz. The high attenuation constants are between 350 and 500 at peak position. The optimal
RL reaches around -45 dB and the practicable frequency bandwidth is beyond 12GHz. It
suggests that the ion doped BFO powders could be used as microwave absorbing materials with
extraordinary properties.
Notes
Page 33
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Contributed Presentations
Sintering behaviors of BaTiO3 with 50 wt. % of B2O3-Bi2O3-SiO2-ZnO glass at
Ultra-Low Sintering Temperature
Mei-Yu Chena*b, Jari Juutia, C. S. Hsic, C. T. Chiab, Heli Jantunena
a
Microelectronics and Materials Physics Laboratories, University of Oulu, Finland
b
Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
c
Department of Material Science and Engineering, National United University, Miao-Li 36003,
Taiwan
*
Corresponding author. Tel. +358 50 350 6982, chenmyphy@gmail.com
Abstract
In this study, the thermal and dielectric properties of BaTiO3 with 50 wt. % of B2O3-Bi2O3-SiO2ZnO (BBSZ) glass are investigated in different condition. Planetary ball milled BBSZ glass and
nano-milled BBSZ glass and few LiF additions on BaTiO3 are proven to be beneficial to lower
sintering temperature and enhance the dielectric properties from 1 kHz to 1 GHz. The thermal
properties of BBSZ glass in different condition are revealed by differential scanning calorimetry
(DSC) measurement .The shrinkage rates of BaTiO3-BBSZ compositions as a function of with
temperature and sintering temperature of samples was determined by dilatometric measurements.
There are two sintering mechanism event around 450 oC and 750 oC. The sintering behaviors
change by particle size and preheated procedure. The merit of small size particles and preheated
procedure both can lower sintering temperature of 8 oC while preheated samples have large
shrinkage rate. In addition, LiF addition inhibit the generation of new phases or appearance of new
phases start from around 400 oC, which are hinted in DSC curve. XRD and Raman spectra do not
show extra phase in 50 wt. % BaTiO3-BBSZ samples. Dielectric Losses of samples, which were
prepared in different conditions (preheated, nano-glass, and few LiF additions) and then were
sintered at 450 oC, have similar value tanδ ~ 0.02 while permittivity of preheated sample has
highest value of 137 at 100 MHz.
Notes
Page 34
Contributed Presentations
Dependence of Microwave Dielectric Properties on crystallization Behaviour of CaMgSi2O6 Glass-Ceramics
Bo Kyeong Choi, Sung Wook Jang and Eung Soo Kim*
Department of Materials Engineering, Kyonggi University, Suwon, Korea
*Corresponding author. Tel. +82 31 249 9764, eskim@kyonggi.ac.kr
Abstract
The effects of crystallization behaviours on the microwave dielectric properties of CaMgSi2O6 (diopside) glassceramics were investigated as a function of Cr2O3 content and heat-treatment method (one or two-step).
Crystallization behaviours of the specimens were affected by the Cr2O3 content as well as heat-treatment
method, and were evaluated by X-ray diffraction analysis by the combined Rietveld and reference intensity
ratio (RIR) method. The dielectric constants (K) of the specimens did not change significantly with increasing
Cr2O3 content. The quality factor (Qf) of the specimens increased when Cr2O3 content was increased up to
0.5 wt.% Cr2O3, and then decreased. These results have been attributed to the degree of crystallization. For
the same content of Cr2O3, the specimens heat treated by two-step methods showed lower K values and
higher Qf values than those heat treated by the one-step method. These results have been attributed to the
smaller crystallite size and higher degree of crystallization in the specimens obtained from two-step heat
treatment compared to those of the samples obtained by the one-step method.
Notes
Page 35
Contributed Presentations
Titanate Glass-ceramic materials for mobile applications in the GHz
frequency range
Hubertus Brauna,b,c*, Martin Letza, Martun Hovhannisyanaa,d, Hans-Joachim Elmersb,c
a
Material & Technology Development, SCHOTT AG, Hattenbergstrasse 10, Mainz, 55122,
Germany
b
Institute of Physics, Johannes-Gutenberg Universitaet Mainz, Staudingerweg 7, Mainz, 55128,
Mainz
c
Graduate School of Materials Science in Mainz, Johannes-Gutenberg Universitaet Mainz,
Staudingerweg 9, Mainz, 55128, Mainz
d
Institute of Physics, Johannes-Gutenberg Universitaet Mainz, Staudingerweg 7, Mainz, 55128,
Mainz
*Corresponding author. Tel. +49 6131 66 1761, hubraun@students.uni-mainz.de
Abstract
In the current work, bulk glass-ceramics in the TiO2-SiO2-B2O3-Al2O3 system are developed (εr
~ 20-35, Qf ≈ 10.000 GHz, |τf | < 20 ppm/K) which have promising properties as microwave
materials. Conventional sinter-ceramics show a number of disadvantages for the use in large
scale manufacturing processes as for example strong batch-to-batch variation in dielectric
properties (Δεr/εr ~ 2-3%) and high porosity. The use of glass-ceramics enables intrinsic porefree materials with comparatively superior surface properties combined with an excellent
homogeneity (Δεr/εr < 10-3 over 10 cm blanks). Glass-ceramics are produced from a
homogeneous basic glass, casted in a conventional glass production process which undergoes a
temperature treatment with a defined temperature profile (<1000°C) to initiate a controlled
partial crystallization of paraelectric crystalline phases inside glass. The materials are analyzed
with respect to their suitability for dielectric loaded antenna applications. Comparative
measurements with antennas made from commercially used sinter-ceramics are shown.
Notes
Page 36
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
Contributed Presentations
Studies on SrTiO3-based Grain Boundary Barrier Capacitor
Chen Wei-Tingb, Wen-His Leea*
a
b
Department of Electrical Engineering, National Cheng Kung University, Taiwan, ROC
Department of Materials Engineering, Penn State University, S.C.USA
*Corresponding author. Tel. +886-6-275-7575 ext. 62445, leewen@mail.ncku.edu.tw
Abstract
In this study, TiO2, MnO, SiO2 and LiCO3 were doped into SrTiO3 sintered at 1350℃ for 2 hrs in a 95/5
N2/H2 reducing atmosphere and re-oxidation at 1100℃ for 1 hr in N2 atmosphere for attaining a grain
boundary barrier capacitor. TiO2 is used to modify the A/B ratio of SrTiO3, MnO is incorporated into Tisite of SrTiO3 as a acceptor and SiO2 and LiCO3 are both as sintering aids for densification of SrTiO3.
Density of SrTiO3 based grain boundary barrier capacitor can achieve 98% of theoretical density and
grain size is around 15-20μm. After optimization, dielectric properties of the SrTiO3 based with TiO2,
MnO, SiO2 and LiCO3 addition is very promising, including dielectric constant is higher than 10000 and
insulation resistance is higher than 1000MΩ.
Notes
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
as the main, affiliation address. Page 37
Contributed Presentations
Effect of Sn4+ substitution on
(Mg0.95Ni0.05)(Ti1-xSnx)O3 Ceramics
Microwave
Dielectric
Properties
of
Hyun Jin Jo and Eung Soo Kim*
Department of Materials Engineering, Kyonggi University, Suwon, Korea
*Corresponding author. Tel. +82 31 249 9764, eskim@kyonggi.ac.kr
Abstract
The effects of the Sn4+ substitution for Ti4+-site on the structural characteristics and microwave
dielectric properties of (Mg0.95Ni0.05)(Ti1-xSnx)O3 (MNTS, 0 ≤ x ≤ 0.25) ceramics were
investigated. The single phase of ilmenite structure was confirmed up to x = 0.15, and then SnO2
was observed as secondary phase for futher substitution. For the specimens with single phase of
ilmenite, the unit cell volume increased with Sn4+ substitution due to the larger ionic size of the
Sn4+ than Ti4+. The quality factor (Qf) of the MNTS depended on the B-site bond valence of the
specimens. The dielectric constants (K) of the specimens decreased with increase of Sn4+
substitution due to the lower polarizability of Sn4+ than Ti4+. The temperature coefficient of
resonant frequency (TCF) of the specimens decreased with Sn4+ substitution, which could be
attributed to the decrease of octahedral distortion of the specimens. The relationship between
microstructure and microwave dielectric properties were also discussed
Notes
Page 38
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Contributed Presentations
Enhanced Q, High Dielectric Constant Microwave Dielectric Materials for
LTE Applications
Michael Hilla*
a
Trans-Tech Inc. (A subsidiary of Skyworks Solutions Inc.) , 5520 Adamstown Rd., Adamstown
MD 21710, USA
*Corresponding author. Tel. +1 301 874 6422, mike.hill@skyworksinc.com
Abstract
Modern low frequency LTE applications require enhanced Q, temperature stable materials in
with dielectric constants between 70 and 80. Although the Ba6-3xLn8+2xTi18O54 system has been
well studied and has the highest dielectric constant values of any temperature compensated
system, Q values are currently insufficient for modern LTE applications. However, with
substitutions of aluminum and/or germanium for titanium on the octahedral site, polycrystalline
ceramic materials with Qf products in the 11000 – 12000 range at 1 GHz may be obtained. In
addition, high Q structures with aluminum substituted for titanium and barium on the rhombic
sites may be obtained which are chemically compatible with rutile forming temperaturecompensated, enhanced Q, two-phase compacts with dielectric constants above 70.
Notes
Page 39
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Contributed Presentations
Low-permittivity and low-loss microwave dielectrics based on feldspar and
feldspar-like structures
Marjeta Maček Kržmanc*, Danilo Suvorov
Advanced Materials Department, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
Corresponding author: Tel. +386 1 477 3292, marjeta.macek@ijs.si
Abstract
Recent rapid progress in wireless communications has created the need for a broadening of the
utilized frequency range to include higher frequencies (> 10 GHz). This trend has increased the
interest in new, low-permittivity materials with extremely low dielectric losses and a
temperature-stable resonant frequency (f). In this study we will show that several feldspar and
feldspar-like ceramics meet these requirements. The fact that feldspars can adopt several heteroor iso-valent substitutions, possess wide ranges of solid-solubilities and exist in various crystal
modifications, offers a variety of possibilities for tuning their microwave dielectric properties.
The investigations, which include alumosilicate and tetrahedrally-substituted gallo-germanate
feldspars, revealed that these materials exhibit a permittivity of 6-9, Qxf values up to 150 000
GHz and f in the range from -5 to -130 ppm/°C, typically -20 ppm/°C. The correlations between
the crystal structures and microwave dielectric properties will be discussed in terms of the
structural ordering, crystallographic features and phase-transition behaviour.
Notes
Page 40
Contributed Presentations
Effect of Zn and In substitution for Mg and Ga on microwave dielectric
properties of spinel-structured (Mg1-xZnx)(Ga2-yIny)O4 ceramics with low
dielectric loss
Akinori Kan*, Susumu Takahashi, Hirotaka Ogawa
Graduate School of Science and Technology, Meijo University, 1-501 Shiogamaguchi,
Tempaku-ku, Nagoya 4688502, Japan
*Corresponding author. Tel. +81 52 838 2072, akan@meijo-u.ac.jp
Abstract
The spinel-structured (Mg1-xZnx)(Ga2-yIny)O4 ceramics were synthesized to characterize the
crystal structure and microwave dielectric properties. From the crystal structure refinement, it
was found that the MgGa2O4 ceramic has an intermediate spinel structure which corresponds to
the general formula of (Mg0.14Ga0.86)(Mg0.86Ga1.04)O4, whereas the ZnGa2O4 ceramic has a
normal spinel structure. In the case of (Mg1-xZnx)GaO4 ceramics, the single phase was obtained
over in the composition range of 0-1; the dielectric constant of the ceramics slightly increased
from 9.5 to 10.5, depending on the composition x. The (Mg1-xZnx)GaO4 ceramics exhibited the
excellent quality factor (Q ・ f) higher than 2.0 × 105 GHz; therefore, the properties were
considered to be comparable to other low loss dielectrics. The microwave dielectric properties of
In-substituted Mg(Ga2-yIny)O4 ceramics are characterized and the relationship between cation
distribution and microwave dielectric properties are discussed in this study.
Notes
NotesAbstract Submission, Oral.
Page 41
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Contributed Presentations
Effects of B2O3 addition on sintering behavior and microwave dielectric
properties of (Sr0.6Ca0.4)LaAlO4 ceramics
Bing Liu*, Lei Yi, Xiang Ming Chen
Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027,
China
*Corresponding author. Tel. +86 13738061945, 11226036@zju.edu.cn
Abstract
The effects of B2 O3 addition on the sintering behavior, microstructure, and microwave dielectric
properties were investigated for (Sr0.6 Ca0.4 )LaAlO 4 ceramics. The densification temperature for
(Sr0.6 Ca0.4 )LaAlO 4 ceramics was as high as 1450o C, while it could be obviously decreased with
B2 O 3 addition, and the dense ceramics could be obtained at a sintering temperature around
1350o C. The fine microstructures were confirmed in the (Sr0.6 Ca0.4 )LaAlO 4 ceramics sintered at
relatively lowered temperature, and good microwave dielectric properties were obtained.
Notes
Page 42
Contributed Presentations
Functional dielectric oxide and oxynitride perovskite thin films deposited by
reactive magnetron sputtering
C. Le Pavena*, R. Benzergaa, L. Le Gendrea, Y. Lua, H. Nguyena,b, F. Tessierc, F. Chevirec, S. Jacqa, S.
Riouald, A. Sharaihaa, C. Delaveaudb, X. Castela
a
Institut d’Electronique et de Télécommunications de Rennes (IETR), Equipe Matériaux Fonctionnels,
IUT Saint Brieuc, Université de Rennes 1, 22000 Saint Brieuc, France.
b
CEA LETI Minatec Campus, 17 Rue des Martyrs, 38 054 Grenoble cedex 9, France.
c
Institut des Sciences Chimiques de Rennes (ISCR), Equipe Verres et Céramiques, Université de Rennes
1, 35000 Rennes, France.
d
Laboratoire de Magnétisme de Brest (LMB), Université de Bretagne Occidentale, 29000 Brest, France.
*Corresponding author. Tel. +33 296609659, claire.lepaven@univ-rennes1.fr
Abstract
In the field of microwaves, high-performance materials needs drive the research on perovskite compounds
which present attractive dielectric and ferroelectric properties. Our contribution is related to the
development of oxide and oxynitride La-Ti-O-N and (Sr,La)-(Ta,Ti)-O-N perovskite thin films with high
permittivities and low loss in order to integrate them microwave planar devices. In these systems, the
oxygen/nitrogen substitution can be used to monitor the dielectric properties; furthermore, the Curie
temperature (TC) of the ferroelectric solid solution (Sr1-xLax)(Ta1-xTix)-O-N could be adjusted close to
room temperature by the variation of x. Oxide and oxynitride thin films have been deposited by reactive
RF magnetron sputtering from homemade compacted targets. A study of their composition, morphology
and crystallization has been carried out, in correlation with dielectric measurements performed at low and
high frequencies. The evolution of the dielectric constant under bias electric field (tunability) has been
also checked. Results will be given in the final contribution.
Notes
Page 43
Contributed Presentations
Investigations of Low temperature Co-Fired M-type Barium Hexaferrites and
BaO•(Nd1-xBix)2O3•4TiO2 Dielectric Ceramics
Chi-Shiung Hsia, Heli Jantunenb, Fang-Chi Hsua*, Chi-Wei Changa, Hsing-I Hsiangc,
Min-Yu Yanga
a
Department of Materials Science and Engineering, National United University, Miao-Li, 36003,
Taiwan
b
Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 4500, FIN90014 Oulu, Finland
c
Department of Resource Engineering, National Cheng-Kung University, Tainan, 70101, Taiwan
*Corresponding author. Tel. +886-37-382238, fangchi@nuu.edu.tw
Abstract
In this study, tungsten bronze BaO•(Nd1-xBix)2O3•4TiO2(x=0、0.1、0.2, BNBT) dielectric cofired with
M-type barium ferrite Ba(CoTi)xFe12-2xO19(x=1.2, BaM(CoTi)1.2) magnetic ceramic via a low temperature
co-fired process using Bi2O3-B2O3-SiO2-ZnO(BBSZ) glass as sintering aid. The BBSZ glass effectively
reduced the sintering temperature of dielectric and magnetic ceramics by forming liquid phase. With
different amount of glass contents, the BNBT dielectric and BaM(CoTi)1.2 magnetic materials were
sintered at temperature between 900 and 1000oC. Sintering of BNBT and BBSZ glass composites, second
phases of Bi4Ti3O12 and BaTi4O9 were found from 900oC sintered samples, the dielectric constant of the
sintered sample thus decrease. The 1000oC sintered magnetic-glass composite didn’t formed second
phase. The dielectric-glass and magnetic-glass composites were tape casted and laminated, and
cosintered. Dielectric and magnetic layer structure after sintering. There did not have any second phase
found at interface between BaM(CoTi)1.2 and BNBT layers after sintered at 900oC.
Notes
Page 44
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Contributed Presentations
Decreasing the relative permittivity of LTCC by porosification with the use of
Poly(methyl methacrylate) microspheres.
Maciej Sobocinski*, Mikko Nelo, Timo Vahera, Jani Peräntie, Jari Juuti, Heli Jantunen
Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech
Oulu, University of Oulu, P.O. Box 4500, FIN-90570 Oulu, Finland
*Corresponding author. Tel. +358 294 482746, maciej@ee.oulu.fi
Abstract
Low Temperature Co-fired Ceramic tapes are one of the cornerstones of today’s electronics.
However, their relatively high permittivity limits their usage at high frequencies. In order to
benefit from the well-established LTCC technology processes at microwave frequencies a
method to decrease their permittivity is needed. In this paper, commercially available LTCC has
been de-binded into powder, mixed with Poly(methyl methacrylate) microspheres, tape cast,
laminated and co-fired forming porous ceramic. Different porosities were tested. Permittivity and
dielectric losses of the samples were measured at 1 GHz, 3 GHz and 5 GHz. Permittivity
decreased by up to 29 % compared to reference sample without porosity. Finally microstructure
of the samples was analyzed with optical microscope. The method proved as promising way for
manufacturing of low-k multilayer ceramic substrates using existing technologies.
Notes
Page 45
Contributed Presentations
Microwave dielectric loss mechanism in xMgTiO3-(1-x)Ca0.8Sr0.2TiO3 ceramics
Jie Zhanga, Zhenxing Yueb*
a
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and
Engineering, Tsinghua University, Beijing 100084, P. R. China
b
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and
Engineering, Tsinghua University, Beijing 100084, P. R. China
*Corresponding author. Tel. +86 10 62784579, yuezhx@mail.tsinghua.edu.cn
Abstract
(1-x)MgTiO3-xCa0.8Sr0.2TiO3 (0.04  x  0.2) composite ceramics were prepared by the
conventional solid state reaction process. The phase composition, microwave dielectric
properties and dielectric loss mechanism were studied. X-ray diffraction analysis revealed that
MgTiO3 and Ca0.8Sr0.2TiO3 coexist without forming secondary phases. Ca0.8Sr0.2TiO3 was
employed as a τf compensator and decreased Q×f instead. Thermally simulated depolarization
current was conducted to obtain the defects associated with extrinsic loss mechanism. The
concentrations of both defect dipole and oxygen vacancies increased with the increasing x
content, generating dielectric loss subsequently. It demonstrated that the microwave dielectric
loss was basically influenced by phase composition and defects here. Temperature-stable
ceramics can be achieved at x = 0.06, where the microwave dielectric properties were εr = 21.19,
Q×f = 110 900 GHz (f = 9.295 GHz) and τf = -0.9 ppm/ºC, respectively.
Notes
Page 46
Contributed Presentations
Frequency-dependent Qf value of microwave dielectric ceramics
Lei Lia*, Xiang Ming Chena
a
Laboratory of Dielectric Materials, Department of Materials Science & Engineering, Zhejiang
University, Hangzhou 310027, CHINA
*Corresponding author. Tel.: +86 571 8795 1410, zjulilei@zju.edu.cn
Abstract
The microwave dielectric properties of some typical low-loss microwave dielectric ceramics
were evaluated by the resonant cavity method, and the frequency dependence of Qf value was
investigated. The measurement frequency was changed by adjusting the sample size for TE011
resonant mode, or by adopting higher-order TE0np modes for a fixed sample. The measured Qf
values by the two methods increase significantly with increasing frequency for all the ceramics,
which contradicts the common recognition that the Qf value of microwave dielectric ceramics is
a frequency-independent constant at microwave frequencies. The frequency dependence of Qf
value is attributed to the extrinsic dielectric loss induced by the microstructural defects, which is
not proportional to the frequency.
Notes
Page 47
Contributed Presentations
Influence of particle shape on electric properties of printed dielectric layers
Marcin Slomaab*, Marjeta Macek Krzmancc, Meria Teirikangasd, Elzbieta Zwierkowskab, Mikko
Nelod, Lucja Dybowskab, Danilo Suvorovc, Małgorzata Jakubowskaab, Heli Jantunenc
a
Institute of Metrology and Biomedical Engineering, Warsaw University of Technology,
Warsaw, 02-525, Poland
b
Institute of Electronic Materials Technology, Warsaw, 01-919, Poland
c
Advanced Materials Department, Jozef Stefan Institute, Ljubljana, SI-1000, Slovenia
d
Microelectronics and Materials Physics Laboratories, University of Oulu, Oulu, FIN-90014,
Finland
*Corresponding author. Tel. +48 22 234 8306, marcin.sloma@mchtr.pw.edu.pl
Abstract
We present influence of particle shape of barium titanate nanopowders, on electric properties of
printed composite dielectrics for printed elastic electronics. From several types of powders we
selected three main types: spheres, flakes and needle shapes. Based on assumption that various
shapes will influence differently electrical properties, we prepared PMMA composite layers
filled with nanopowders containing wide range of dielectric content (form 10÷70 wt.%).
Influence on dielectric permitting was observed between layers containing different shapes with
equal amount of powders, for samples measured with split post dielectric resonator in range of
GHz. Further steps will incorporate such layers in LC coupling circuits for wireless
communication systems using printed electronics circuits.
Notes
Page 48
1
Contributed Presentations
All-printed frequency tunable antenna with lead-free piezoelectric ink
T. Siponkoskia*, O. Gbotemia, M. Neloa, J. Juutia, H. Jantunena
a
Microelectronics and Materials Physics laboratories, University of Oulu, BOX 4500, FI-90014
University of Oulu, Finland
*Corresponding author. Tel. +358 50 350 3051, tuomo.siponkoski@oulu.fi
Abstract
The purpose of this study is to fabricate a fully printable, frequency tunable antenna using screen
printed structures and low temperature curing piezoelectric ink. The ink consist of barium
titanate and poly(vinylidenefluoride-co-trifluoroethylene). Dupont silver ink 5064H was used for
printing the conductive lines in the design. The maximum process temperature is 130 °C.
The design of the antenna is based on a folded slot antenna and the tuning element, a
variable capacitor, is located on the antenna between the ground plate and the RF signal line.
Frequency tuning was made by changing the dimensions and permittivity of the tuning element
via the ferroelectric and piezoelectric properties of the formulated ink composite. The developed
material and configuration could be used as a tunable antenna or wireless sensor elements in the
future.
Notes
Page 49
1
Contributed Presentations
La2Ti2O7 perovskite compound: from the thin film deposition to the Notch antenna
miniaturization
a
Ratiba BENZERGA *, Hung Viet NGUYENa,b , Christophe DELAVEAUDb, Ala SHARAIHAa, Claire LE
PAVEN a, Laurent LE GENDREa, Yu LUa , Xavier CASTELa, Sophie VERRUNb
a
Institut d’Electronique et de Télécommunications de Rennes (IETR, UMR-CNRS 6164),
Equipe Matériaux Fonctionnels, IUT Saint-Brieuc, Université de Rennes 1, 22004 Saint-Brieuc,
France
b
CEA-LETI, Minatec, 17 avenue des Martyrs, 38054 Grenoble Cedex 9, France
*Corresponding author. Tel. +332 96 60 96 61, ratiba.benzerga@univ-rennes1.fr
Abstract
Wireless systems have become increasingly complex and require smaller components capable of
operating at multiple frequencies. The most studied solution for miniaturization of antenna is to
use a short circuit; another solution lies on using a localized charge based on dielectric thin film.
This work presents the design, the development, the characterization and the integration of a
perovskite dielectric material in a discrete component for antenna miniaturization operating at
microwave frequencies. La2Ti2O7 thin films were grown by reactive magnetron sputtering. These
films present a relative permittivity close to 60 associated with low dielectric losses (Tan Delta 
3.10 -3) at 1 GHz. The insertion of a Metal-Insulator-Metal (MIM) type capacitive structure,
based on those La2Ti2O7 thin films, in the "Notch" antenna was studied. As predicted by the
theoretical modeling of the structure, experimental measurements confirm that this localized
charge insertion results in an antenna size reduction of 60%.
Notes
Page 50
Contributed Presentations
A study of the stress induced during the construction and manufacturing of
chip inductors
Shih-Feng Chiena*, Wen-Ting Chena, Wen-Hsi Leea, Pei-Yi Weib, Wen-Yu Linb, Po-Chih Shenb
a
Department of Electrical Engineering, Cheng Kung University, Tainan 701, Taiwan (R.O.C.)
Cyntec Co., LTD., Taiwan (R.O.C.)
*Corresponding author. Tel. 886-3-579-9829 ext. 1723, chien-eddie@cyntec.com
b
Abstract
Ni-Cu-Zn ferrite components are very sensitive to stress and this can cause unstable
permeability. This work focuses on the relation between inductance and stress, the source of
stress, and the interaction between the residual stress after sintering and the further stresses
contributed by subsequent manufacturing processes of multilayer chip inductors. The results
show that the sources of stress include the large particle size difference between foils, cofiring of
ferrite and silver coils, and the operations involved in the manufacturing processes. The results
also show that the stresses pass through the interfaces between materials to the body of
component and that the stresses induced in the subsequent manufacturing processes would
accumulate or counteract with the residual stress in the component, although the stress can also
be released by changing the connection status of these interfaces. The results also show that the
compression and tension stresses cause different levels of inductance shift.
Notes
Page 51
Contributed Presentations
Recycled glass based foams for microwave applications
Ratiba Benzergaa*, Vincent Laurb, Ronan Lebullengerc, Laurent Le Gendrea, Ala Sharaihaa,
Patrick Queffelecb
a
Institut d’Electronique et de Télécommunications de Rennes (IETR), Equipe Matériaux
Fonctionnels, IUT Saint-Brieuc, Université de Rennes 1, 22004 Saint-Brieuc, France
b
Laboratoire en sciences et techniques de l'information, de la communication et de la
connaissance (Lab-STICC), Université de Bretagne Occidentale, 29238 Brest, France
c
Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1, 35042 Rennes, France
*Corresponding author. Tel. +332 96 60 96 61, ratiba.benzerga@univ-rennes1.fr
Abstract
Absorbent materials resulting from the combination of a dielectric matrix filled with lossy
particles (carbone, ferrite, conductive polymers) are of interest for the microwave field.
Currently, most commercially available composites are based on organic polymers. In this work,
we present the performance of an eco-designed and polyfunctional, foamed composite. This
structure is obtained from recycled waste glass products. Two types of waste (soda-lime glasses
or Cathode Ray Tubes / CRT) were combined with various foaming agents (C, SiC, AlN). For
the microwave characterization, a transmission-reflection method using a rectangular waveguide
is used to determine the dielectric properties of the foams. The impact of foam density, glass
type, additive type and amount on the electromagnetic performances at microwave frequencies
has been assessed. The foams produced using CRT-glass and carbon as foaming agent present
high dielectric losses (Tan = 0.37 @ 10 GHz) and could be used in fireproof electromagnetic
absorbent panel.
Notes
Page 52
Contributed Presentations
New Type Aurivillius Structure Lead-Free Ceramics (Na,K)1Bi3Ti5O18 by
Synthesis of Original Compound (Na,K)2CO3
Tai-Kuang Leea, Ying-Chieh Leeb and Wen-His Leea*
a
Department of Electrical Engineering, National Cheng Kung University, Taiwan, ROC
Department of Materials Engineering, National Pingtung University of Technology and Science,
Taiwan, ROC
*Corresponding author. Tel. +886-6-275-7575 ext. 62445, leewen@mail.ncku.edu.tw
b
Abstract
(Na,K)2CO3 powder had the advantage of uneasy deliquesce, manufacturing process easy, fast
and low working temperature because of using integration and synthesis of sodium carbonate
and potassium carbonate. The structure of the m=5 Aurivillius phase (Na,K)1Bi3Ti5O18 (NKBT)
was prepared by the solid state synthesis reaction from the conventional mixture of oxides, viz.
(Na,K)2CO3, Bi2O3 and TiO2 at 950 to 1050 ℃ . It was a safe and lead-free material for
environmental protection. Aurivillius structure ferroelectric material was characterized by their
low dielectric constant, high Curie temperature (Tc), and large anisotropy in the
electromechanical coupling factor. There was clear evidence of Aurivillius structure NKBT by
scientific instruments as Transmission Electron Microscope (TEM) and X-Ray Diffraction
(XRD). There had large anisotropy ratio in the lattice parameter a/c, the low dielectric constant
of 214, and low dielectric factor tanδ=2.4%.
Notes
Page 53
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
Contributed Presentations
Dielectric ceramics in various ternary La2O3–TiO2–MO systems
S. D. Škapin* and D. Suvorov
Advanced Materials Department, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
*
Corresponding author. Tel. +386 14773708, sreco.skapin@ijs.si
Abstract
A systematic investigation of the high-temperature phase relations in various ternary oxide
systems La2O3–TiO2–MO (MO= CaO, Al2O3, Ga2O3, Mn2O3, Fe2O3, Nb2O5, Ta2O5) has been
conducted in order to identify new phases with interesting microwave dielectric properties. It was
confirmed that such MO oxides stabilize the formation of the perovskite La2/3TiO3 compound,
which is otherwise not stable in a stoichiometric composition due to the large number of vacant
A-sites. The incorporation of added M-cations stabilizes the perovskite structure across a wide
compositional range, having the formula: i) La(2-2x)/3MxTiO3 (M=Ca), ii) La(2+x)/3Ti(1-x)MxO3
(M=Fe, Al, Ga, Mn) and iii) La(2-x)/3Ti(1-x)MxO3 (M=Nb, Ta). In the investigated systems several
new compounds and solid solutions were identified and characterized with respect to their
structural and electrical properties. Thus, the phases based on these systems show a range of
electrical properties, from excellent MW dielectric to the semiconducting properties.
Notes
Page 54
Contributed Presentations
Effective Vacancy Size in Lead Lanthanum Zirconate Titanate
Kevin Tolmana*, Rick Ubica
a
Department of Materials Science & Engineering, Boise State University, Boise, ID 83725, USA
*Corresponding author. Tel. +1 208 859 7938, kevintolman@boisestate.edu
Abstract
Intrinsic microwave properties are dependent upon material structure, but the precise structural
effect which vacancies have in (Pb1-3xLa2x□x)(Zr0.6Ti0.4)O3 (x ≤ 0.1) (PLZT) and perovskites
generally is unclear. This work experimentally shows that A-site vacancies in both PLZT and
Pb1-3xLa2x□xTiO3 (PLT) have a size which is both finite and a function of concentration. In the
case of PLT, the effective size increases with concentration, while in PLZT it decreases. Both
effects have been modeled with great precision. In addition, the effective size of oxygen ions in
PLZT and PLT decreases with increasing vacancy concentration due to the slight decrease in
their secondary coordination. When both effects are considered, pseudocubic cell volume can be
predicted from stoichiometry and published ionic-radius data alone to within ~2%. The
proposed model may eventually provide a method for substrate engineering and facilitate
property tailoring based on improved structural predictions.
Notes
Page 55
Poster Presentations
Miniaturized and reconfigurable Notch antenna based on BST thin film
Hung Viet Nguyenb , Ratiba Benzerga a*, Caroline Borderonc, Christophe Delaveaudb, Sabrina
Pavyc, Ala Sharaihaa, Raphael Renoudc, Kevin Nadaudc, Claire Le Pavena, Hartmut W. Gundelc
a
Institut d’Electronique et de Télécommunications de Rennes (IETR), Equipe Matériaux
Fonctionnels, IUT Saint-Brieuc, Université de Rennes 1, 22004 Saint-Brieuc, France
b
CEA-LETI, Minatec, 17 avenue des Martyrs, 38054 Grenoble Cedex 9, France
c
IETR, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
*Corresponding author. Tel. +332 96 60 96 61, ratiba.benzerga@univ-rennes1.fr
Abstract
In recent years, reconfigurable antennas have received significant attention for their application
in modern telecommunication systems. The requirements for increased functionality within a
confined volume place a greater burden on today's transmitting and receiving systems with
frequency agile capabilities. Many solutions have been proposed in the literature, including the
use of ferroelectric materials, such as KTN and BST. In this work, the design, realization and
characterization of a small and tunable antennas loaded by a Ba0,80Sr0,20TiO3 ferroelectric thin
film, obtained from chemical solution deposition, are studied. The integration of a capacitive
structure in a Notch antenna can miniaturize and change the resonance frequency of this antenna
by applying a DC electric field. Monolithic integration is used for realizing the BST loaded
antenna prototype. Characterization shows a frequency agility of 14.5% under DC electric field
of 375kV/cm, which is one of the best performances reported in the literature with this
technology.
Notes
Page 56
Poster Presentations
Carbon fibers loaded polymer foams for microwave absorption
Ratiba Benzergaa*, Vincent Laurb, Ala Sharaihaa
a
Institut d’Électronique et de Télécommunications de Rennes (IETR), Université de Rennes 1,
22004 St-Brieuc, France
b
Laboratoire en Sciences et Techniques de l'Information, de la Communication et de la
Connaissance (Lab-STICC), Université de Bretagne Occidentale, 29238 Brest, France
*Corresponding author. Tel. +332 96 60 96 61, ratiba.benzerga@univ-rennes1.fr
Abstract
The recent evolutions of telecommunications led to an increasing deployment of microwave and
radiofrequency systems which generates unwanted electromagnetic radiations in our
environment. To overcome and eliminate these radiations, absorber materials, based on
polyurethane foams loaded with carbon powders are usually used. In our work, we propose to
study the electromagnetic attenuation of polymer foams loaded with carbon fibers.
Microwave characterizations of loaded polymer foams were achieved with a rectangular
waveguide at microwave frequencies. These measurements show high dielectric losses which are
probably related to the dimension of the absorber filler. Values of permittivity and dielectric
losses, of loaded foam, significantly and linearly increase with the load mass percentage and with
the foam density. Moreover, a numerical simulation of the electromagnetic attenuation has been
done with a 2cm-thick layer. Interesting attenuation has been obtained, such as 41.2dB for
loaded absorbers with 0.6% by weight, compared to the unloaded foam (0.18dB).
Notes
Page 57
Poster Presentations
Improvement on the continuity of Cu inner electrode of (Ba,Ca)(Ti,Zr)O3
multilayer ceramic capacitors by a novel sintering
Chen-Su Chianga, Wei-Ting Chenga, Shih-Hao Wanga and Wen-His Leea*
a
Department of Electrical Engineering, National Cheng Kung University, Taiwan, ROC
*Corresponding author. Tel. +886 2757575-62445, leewen@mail.ncku.edu.tw
Abstract
In this study, a novel sintering technique combining rapid heating and constrained sintering was
adopted to fire multilayer ceramic capacitors with copper electrode. It was demonstrated that the
inner electrode continuity of (Ba,Ca)(Ti,Zr)O3-based MLCCs was associated with the chamber
development, which is attributed to the mismatch between the inner electrode and dielectric
material during co-firing process. By careful controlling the thickness of constraining layer and
rapid heating, the internal residual stress can be significantly minimized when MLCCs fired by
the novel sintering technique instead of free sintering. The Cu inner electrode with high continuity
(98%) and the fine grain size (0.58μm) with narrow distribution (0.05μm) of (Ba,Ca)(Ti,Zr)O3based MLCCs can be attained by using such a rapid constrained sintering technique when BaTiO3
is used as a constraining layer laminated on both sides.
Notes
Page 58
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Poster Presentations
Sr-Ta-based oxide and oxynitride perovskite-type dielectric thin films
deposited by RF reactive magnetron sputtering
S. Jacqa, C. Le Pavena*, M. Bouchilaouna, L. Le Gendrea, R. Benzergaa, F. Tessierc, F. Chevirec, S. TraoréMantiona, A. Sharaihaa, X. Castela
a
Institut d’Electronique et de Télécommunications de Rennes (IETR), Equipe Matériaux Fonctionnels,
IUT Saint Brieuc, Université de Rennes 1, 22000 Saint Brieuc, France.
b
Institut des Sciences Chimiques de Rennes (ISCR), Equipe Verres et Céramiques, Université de Rennes
1, 35000 Rennes, France.
*Corresponding author. Tel. +33 296609659, claire.lepaven@univ-rennes1.fr
Abstract
This study is dedicated to the deposition and characterization of perovskite-type thin films in order to use
them as dielectric in microwave telecommunication devices. The materials are deposited by reactive
magnetron radio frequency sputtering using a (Sr0.99La0.01)2(Ta0.99Ti0.02)2O7 target. The target is shaped by
uniaxial compaction of powder synthesized by conventional solid state route. By using pure argon or
reactive Ar + O2 sputtering plasmas, oxide films are produced. X-ray Diffraction (XRD) reveals that
Sr2Ta2O7-type films with a preferred (011) orientation can be grown on MgO(001) and SrTiO3(001)
substrates. By using reactive nitrogen plasmas, SrTaO2N-type oxynitride films with a (001) orientation
are epitaxially grown on the above mentioned substrates. Low and high frequency dielectric properties of
films will be discussed in relation to their deposition conditions and morphological, optical and structural
characteristics.
Notes
Page 59
Poster Presentations
Microwave microstrip pseudocombline filters with stepped impedance
resonators based on substrates with high permittivity
A.V. Zakharova, E.A. Nenashevab,c* , E.R. Tepinac
a
National Technical University of Ukraine “Polytechnic Institute of Kyev”, 37, Pobedy St., Kiev,
03056, The Ukraine
b
GIRICОND Research Institute, 10, Kurchatova St., Saint-Petersburg, 194223, Russia
c
Ceramics Co. Ltd., 10, Kurchatova St., Saint-Petersburg, 194223, Russia
*Corresponding author. Tel. +7 812 552 9434, liza@ceramics.sp.ru
Abstract
New designs of microstrip pseudocombline filters have been demonstrated. These types of filters
were fabricated on the microwave dielectric substrates from high permittivity (ɛ r ~100) ceramic
material and based on stepped impedance resonators (SIRs). The most important advantages are
the possibility of implementation symmetric and sharp left skirt frequency characteristics,
providing a narrow bandwidth (3% or less) in according with gap sizes between resonators and
have small sizes in general. Due to special coefficient (K) of electromagnetic coupling between
microstrip SIRs, it’s values and choosing a special topology allowed us to find ways to construct
pseudocombline filters with improved parameters. Moreover, an experimental data of 3-pole and
4-pole filters were obtained in this research.
Notes
Page 60
Poster Presentations
Microwave ceramics materials based on solid solutions in systems ZnTa 2 O 6 MeO 2 (Me=Ti, Zr)
S.S. Redozubova,b, E.A. Nenashevaa,b*, N.F. Kartenkoc, I.M. Gaidamakad
a
GIRICОND Research Institute, 10, Kurchatova St., Saint-Petersburg, 194223, Russia
Ceramics Co. Ltd., 10, Kurchatova St., Saint-Petersburg, 194223, Russia
c
A.F.Iоffe Physicоtechnical Institute Russian Academy of Sciences, 26, Politechnicheskaya St.,
Saint-Petersburg, 194021, Russia
d
St. Petersburg State Mining Institute, 2, 21st Line, Saint-Petersburg, 199106, Russia
*Corresponding author. Tel. +7 812 552 9434, liza@ceramics.sp.ru
b
Abstract
Ceramic samples based on ZnTa 2 O 6 and ZnTa 2 O 6 -MeO 2 (Me=Ti, Zr) compositions have been
obtained using solid state ceramic route. The crystal structure and microstructure of the samples
were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The
regions of isomorphism and dependence of the electric parameters in relation to substitutions of
Ta5+ and Zn2+ by Ti4+ and Zr4+ in the structure of ZnTa 2 O 6 have been summarized. The dielectric
constant, its temperature coefficients and quality factor were studied for ceramic samples in
depending on compositions and technology of sintering. High-Q ceramic materials with ε~34,
Q×f=80000 GHz (f~7 GHz) and τ f =0 ppm/°C based on solid solutions of ZnTa 2 O 6 were
obtained.
Notes
Page 61
Poster Presentations
Low-temperature sintering of spinel-structured MgGa2O4 ceramic by B2O3
addition
Hirotaka Ogawa*, Susumu Takahashi, Akinori Kan
Graduate School of Science and Technology, Meijo University, 1-501 Shiogamaguchi,
Tempaku-ku, Nagoya 4688502, Japan
*Corresponding author. Tel. +81 52 838 2072, ogawah@meijo-u.ac.jp
Abstract
The spinel-structured MgGa2O4 ceramic has been reported to process a relatively low dielectric
constant (εr < 10) and a high quality factor (Q・f > 2.5×105 GHz), though such a high Q・f
value can be obtained when the ceramic is sintered at the temperatures higher than 1540℃. In
order to reduce the sintering temperature of the ceramics, the addition of B2O3 as a sintering aid
was performed and the influence of B2O3 addition on the microwave dielectric properties was
investigated in this study. By the addition of B2O3, the sintering temperature of the ceramics was
extremely reduced from 1540℃ to 1100℃ and the Q・f value varied from 2.0×104 to 1.4×105
GHz, depending on the amount of B2O3. The dielectric constants of the ceramic strongly
depended on the bulk density, ranging from 6.2 to 9.4.
Notes
Notes Abstract Submission, Poster.
Page 62
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Poster Presentations
Methods of nanotube dispersion in printed composite layers for enhancing
electrical properties in GHz range
Marcin Slomaab*, Daniel Janczaka, M. Olszewskac, Mikko Nelod, Bartosz Salskic, Wojciech
Gwarekc, Małgorzata Jakubowskaab
a
Institute of Metrology and Biomedical Engineering, Warsaw University of Technology,
Warsaw, 02-525, Poland
b
Institute of Electronic Materials Technology, Warsaw, 01-919, Poland
c
Institute of Radioelectronics, Warsaw University of Technology, Warsaw, 00-661, Poland
d
Microelectronics and Materials Physics Laboratories, University of Oulu, Oulu, FIN-90014,
Finland
*Corresponding author. Tel. +48 22 234 8306, marcin.sloma@mchtr.pw.edu.pl
Abstract
We present influence of polyoxyalkylene dispersant on electrical properties of carbon nanotube
based composites for printed electronics. Multiwalled carbon nanotubes act as conductive filler
in PMMA composites. While traditional mechanical stirring and homogenization processes are
not sufficient to disperse evenly such materials with high active surface, addition of 1÷5 wt.% of
several types of Malialim surfactants allowed to increase electrical conductivity for screen
printed composite layers, measured up to 5 GHz. A significant decrease in resistance was
observed by two orders of magnitude, compared to additive-free samples. TEM analysis proves
existence of dispersing agent on the surface of nanoparticles. Ongoing experiments are focused
on application for printed electromagnetic shielding.
Notes
Page 63
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
Poster Presentations
Wideband and thin microwave absorber with inhomogeneous resistive sheet
made of ink with graphene nanoplatelets
Marzena Olszewska-Placha a*, Bartlomiej Salski a, Wojeciech Gwarek a, Daniel Janczak b,
Malgorzata Jakubowska b
a
Institute of Radioelectronics, Warsaw University of Technology, Nowowiejska 15/19, 00-665
Warsaw, Poland
b
Department of Mechtronics, Warsaw University of Technology, sw. A. Boboli 8, 02-525
Warsaw, Poland
*Corresponding author. Tel. +48 22 625 73 19, M.Olszewska@ire.pw.edu.pl
Abstract
In this study a novel type of a microwave absorber with an inhomogeneous resistive sheet is
presented. The sheet is made of a resistive pattern and is deposited on a dielectric slab. With a
properly chosen surface resistance of the pattern and its shape an absorbing bandwidth exceeding
an octave can be obtained. It is also proven that a resistive pattern used instead of classical
homogeneous resistive sheet allows decreasing the absorber’s relative thickness comparing with
commonly known solutions like Salisbury or Jaumann screens. The pattern is developed with the
aid of nanocomposites reinforced with graphene nanoplatelets. The graphene nanoplatelets are
applied as a conductive additive in a composite with polymethylmethacrylate as a carrier with a
butyl carbitol acetate solvent. The resistive layers’ surface resistance measurements are
performed and the investigations are verified with the absorber’s performance measurements.
Notes
Part of this work was funded by the Polish National Centre for Research and Development under
GRAF-TECH/NCBR/09/07/2013 contract and by the European Union in the framework of
European Social Fund through the Warsaw University of Technology Development Programme.
Page 64
Poster Presentations
Dielectric and thermal properties of hexagonal boron nitride and magnesium
oxide filled polymer composites.
Susumu Takahashia, Yusuke Imaib, Akinori Kana*, Yuji Hottab, Hirotaka Ogawaa
a
Graduate School of Science and Technology, Meijo University, 1-501 Shiogamaguchi,
Tempaku-ku, Nagoya 468-8502, Japan
b
National institute of Advanced Industrial Science and Technology (AIST), 226-98 Anagahora,
Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
*Corresponding author. Tel. +81-52-838-2072, akan@meijo-u.ac.jp
Abstract
Hexagonal boron nitride (hBN) and magnesium oxide (MgO) filled polymer composites were
prepared by dissolution mixing method, then the mixed composites were molded by injection
molding. In order to characterize hBN fillers orientation state into polymer matrix, the filler
volume fraction ratios of MgO plus hBN to polymer were changed. The composites were
indicated low dielectric constant (εr) of lower than 5 in the all compositions; therefore εr of
composites were compared with Bruggeman mixing model. The dielectric loss of composites
was on the 10-4 order for all compositions. Thermal conductivity of composites indicated most
highest value of 0.89 W/m・K when the filler volume fraction ratios of hBN (20vol%) plus
MgO (20vol%) to polymer. Coefficient of thermal expansion (CTE) of composites decreased
with increasing of hBN volume fraction due to CTE of hBN is lower than that of the MgO.
NotesTakahashi, Abstract Submission, Poster.
Notes
Page 65
Poster Presentations
Improved on sintering condition of lead-free piezoelectric ceramic NKN
material system by doping LiNbO3 and Li2CO3
Tai-Kuang Leea, Chen-Su Chianga, Ying-Chieh Leeb, Chen-Yu Leec and Wen-His Leea*
a
Department of Electrical Engineering, National Cheng Kung University, Taiwan, ROC
Department of Materials Engineering, National Pingtung University of Technology and Science,
Taiwan, ROC
c
Department of Mechanical Engineering, National Pingtung University of Technology and
Science, Taiwan, ROC
b
*Corresponding author. Tel. +886-6-275-7575 ext. 62445, leewen@mail.ncku.edu.tw
Abstract
In this paper, the (Na0.5K0.5)Nb1-xMnxO3-0.01CaTiO3 (NKNCTM) was adopted to develop the
lead-free piezoelectric ceramic. The Mn element was added into the NKNCTM material system
at 1000-1050℃ to modify the piezoelectric property. Because of Mn ions will replace the B-site,
leading to the generated hole by absorption and reduce the resistivity. In addition, the Li2CO3
and LiNbO3 were added into the NKNCTM, respectively. It can be found that the exaggerated
grain growth was observed when Li2CO3 was added into NKNCTM. The result was due to the
fact that the low-melting point compound (Li2CO3) by excessive adding to NKNCTM.
Furthermore, the LiNbO3 were synthesized and added into the NKNCTM at 950℃. According
the electrical property and SEM image, it can obtain the best piezoelectric parameter d33 was 270
pC/N and the uniform distribution of grain size of 0.8± 0.1μm.
Notes
Page 66
1
Present Address. If an author has moved since the work described in the article was done, or was visiting at the time, a 'Present address' (or
'Permanent address') may be indicated as a footnote to that author's name. The address at which the author actually did the work must be retained
as the main, affiliation address. Poster Presentations
Structure, Microwave Dielectric Properties and Thermally Stimulated
Depolarization Currents of (1-x)Ba0.6Sr0.4La4Ti4O15-xBa5Nb4O15 Ceramics
Xiaohua Zhang,1, 2* Jie Zhang1 and Zhenxing Yue1
1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and
Engineering, Tsinghua University, Beijing 100084, China
2. Department of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute,
Jingdezhen 333403, China
*Corresponding author. Tel. +86 10 62784579, zhangcity@126.com
Abstract
The (1-x)Ba0.6Sr0.4La4Ti4O15-xBa5Nb4O15 (x = 0, 0.05, 0.1, 0.15 and 0.2, BSLT-BN) ceramic
samples were prepared by cofiring mixtures of Ba0.6Sr0.4La4Ti4O15 and Ba5Nb4O15 powders.
Structure, microtructure, microwave dielectric properties and thermally stimulated depolarization
currents (TSDC) of BSLT-BN series ceramics were investigated. All samples exhibit the
hexagonal perovskite structure, which implies that BSLT-BN mixtures form the solid solutions.
Raman spectra analysis reveal that the whole Raman bands have some shift to the red directions
and show a new vibrational mode. The microwave dielectric properties of the well-sintered (1x)BSLT-xBN ceramics vary with the Ba5Nb4O15 content. The quality factor varies in the range
of 45000-11200 GHz, whereas near-zero temperature coefficients of the resonant frequency may
be achieved by changing the Ba5Nb4O15 content. TSDC was utilized to explore the extrinsic loss
mechanism. TSDC relaxation peaks are mainly generated by oxygen vacancies. The
deterioration of quality factor is mainly associated to oxygen vacancy defects.
Notes
Page 67
Poster Presentations
Effect of MgO on microstructure and microwave dielectric properties of
0.84CaTiO3-0.16Sm0.9Nd0.1AlO3 ceramics
Xinye Yanga, Xiaohui Wanga*, Longtu Lia
a
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and
Engineering, Tsinghua University, Beijing 100084, China
*Corresponding author. Tel. +86-010-62784579, wxh@mail.tsinghua.edu.cn
Abstract
The MgO-doped 0.84CaTiO3-0.16Sm0.9Nd0.1AlO3 ceramics were prepared via the solid-state
reaction method. The effect of MgO content on the microstructure and microwave dielectric
properties of 0.84CaTiO3-0.16Sm0.9Nd0.1AlO3 ceramics was investigated. The MgO-doped
0.84CaTiO3-0.16Sm0.9Nd0.1AlO3 ceramics obtained the dielectric constant, εr around 65, and it
decreased slightly with increasing MgO content. The temperature coefficient of resonant
frequency, τf was tuned from +53.3ppm/°C to +26.4ppm/°C as the MgO addition increased. A
small amount of MgO effectively promoted the uniformity of the grain morphology, which
benefited the Q×f value improvement. However, the grain growth was restrained and the
secondary phase MgAl2O4 was observed as MgO content increased to 0.8wt%, which
deteriorated the Q×f value seriously. Considering all three parameters of the microwave
dielectric properties, the 0.4wt% MgO-doped 0.84CaTiO3-0.16Sm0.9Nd0.1AlO3 ceramic exhibited
the best performance of εr =64.21, Q×f =30867GHz and τf =26.4ppm/°C sintered at 1375°C for 3
h.
Notes
Page 68
Conference Organizers
MMA2014 Local Conference Committee:
Rick Ubic, conference chair
Dena Ross, conference coordinator
Stephanie Moran
Kevin Talley
Kevin Tolman
Michele Armstrong
Advisory Board:
Xiang Ming Chen (Zhejiang University, China)
Chih-Ta Chia (National Taiwan Normal University, Taiwan)
Robert Freer (The University of Manchester, UK)
Heli Jantunen (University of Oulu, Finland)
Jerzy Krupka (Warsaw University of Technology, Poland)
Hitoshi Ohsato (Nagoya Institute of Technology, Japan)
Danilo Suvorov (Institut “Jožef Stefan”, Slovenia)
International Committee:
Anatolii Belous (Institute of General & Inorganic Chemistry, Ukraine)
David Cruickshank (Trans Tech Inc., USA)
Zhou Ji (Tsinghua University, China)
Stanislav Kamba (Institute of Physics, Academy of Sciences of the Czech Republic)
Eung Soo Kim (Kyonggi University, Korea)
Elizaveta Nenasheva (Giricond Research Institute, Russia)
Mailadil Sebastian (National Institute for Interdisciplinary Science and Technology, India)
Hong Wang (Xi’an Jiaotong University, China)
Page 69