World Journal Of Engineering
Microwave absorption properties of ferrite–acrylated epoxy
polymer nanocomposites
Harun Bayrakdar
Gebze Institute of Technology, Department of Physics, 41400 Gebze/KOCAELİ, TURKEY
Abstract
attracting more attention recently due to
We have investigated the electromagnetic
(EM) characteristics of CoxMn1-xFe2O4
spinel ferrite (where x = 0.0, 0.5 and 1.0)
nanoparticles (NPs) / acrylated epoxy
nanocomposite material at 8-20 GHz.
CoxMn1-xFe2O4
NPs.
have
been
synthesized by cetyltrimethylammonium
(CTAB) assisted hydrothermal route using
NaOH. A variation of complex dielectric
permittivity and magnetic permeability at
room temperature with frequency in the
range 8 GHz – 20 GHz has been studied.
Particles showed phase purity and
crystallinity in powder x-ray diffraction
(XRD) analysis. At the same time,
CoxMn1-xFe2O4 NPs demonstrated a spinel
cubic structure from XRD results. A
reflection loss (RL) of −59.60 dB was
found at 12 GHz for an absorber thickness
of 2 mm. CoxMn1-xFe2O4 may be attractive
candidates for EM wave absorption
materials.
the extensive growth in the application of
electronic devices and security such as
computer local area networks, mobiles
phones, laptops, microwave oven etc [5-7].
Ferrites serve as better electromagnetic
interference (EMI) suppressors compared
to their dielectric counterparts on account
of their excellent magnetic properties.
Ferrite materials exhibit various electrical
and magnetic properties of which the
complex permeability and the complex
permittivity, in particular, are important in
determining
their
high
frequency
characteristics [8–11].
2. Microwave measurements
Measurements were made rectangular
1. Introduction
waveguide technique. Samples was put
In recent years, the number of applications
into a rectangular shape of size a = 19.4
of electromagnetic (EM) wave in the high
GHz
ranges,
which
are
mm, d (cross section length) = 21.5 mm
wireless
and c (thickness) = 2 mm to fit in
telecommunication systems, radar, local
rectangular waveguides and connected
area network, medical equipment, etc., [14].
With
together
applications
between two waveguides. Figure shows the
of
measured absorption spectra for prepared
electromagnetic (EM) wave in the high
GHz
ranges,
the
polymer. In the present studies, optimized
electromagnetic
thickness is 2 mm for sample. This sample
interference (EMI) problems have been
97
World Journal Of Engineering
shows maximum reflection loss of -59.60
[l] Wickenden B.V.A, and W.G. Howell,
dB.
1st Conf. Roc. Millitary Microwaves,
The
reflection
loss
for
sample
thickness of 2 mm in the frequency range
1978, 310.
of 8–20 GHz was made for prepared these
[2] Abbas S.M., Dixit A.K., Chatterjee R.,
composites [7].
Goel T.C., J. Magn. Magn. Mater. 2007,
309, 20.
The microwave absorption, magnetization,
[3] Maeda T., Sugimoto S., Kagotani T.,
EMI shielding, composite permeability and
Tezuka N., Inomata K., J Magn Magn
permittivity of CoxMn1-xFe2O4 / Acrylated
Mater, 2004, 281, 195.
Epoxy composite were analyzed. These
[4] Jing L., Wang G., Duan Y., Jiang Y., J.
microwave absorber are using synthesized
of All. and Com., 2009, 475, 862.
prepared composite has been fabricated,
[5] Lim K.M., Kim M.C., Lee K.A., Park
and
C.G., IEEE Trans. Magn. 2003, 39, 1836.
successfully demonstrated
for
a
maximum reflection loss of -59.60 dB at
[6] Sugimoto S., Okayama K., Kondo S.,
12
Mater. Trans., JIM. 1998, 39, 1080.
GHz
with
approximately
a
GHz
in
[7] Lakshmi K., John H., Mathew K.T.,
thickness of 2 mm. Our results indicate
Joseph R., George K.E., Acta Materialia,
that
2009, 57, 371.
composites
a
of
sample
the
2
bandwidth
exhibit
good
absorption performances. This reflection
[8] Zabetakis D., Dinderman M., Schoen
loss is measured very high and this
P., Adv. Mater. 2005, 17, 734.
bandwidth
[9] Da Silva J.B, Mohallem N.D.S., J
is
higher
than
normally
reported. It can be said that this samples
Magn Magn Mater, 2001, 226, 230.
will
[10] Arshak K.I., Ajina A., Egan D.,
provide
great
benefits
for
electromagnetic applications and EMI
Microelectron J, 2001, 32, 113.
shielding characteristics.
[11] Hwang Y., Mater Lett
Figure Absorption spectra of samles.
3277.
2006, 60,
Keywords: XRD; Microwave Absorbing
10
CoxMn1-xFe2O4 / Acrylated Epoxy
0
Corresponding author. Tel.: +90 262 605 13 51;
-10
fax: +90 (262) 653 84 90;
RL (dB)
-20
-30
e-mail: habay78@yahoo.com
-40
x=0
-50
x=1
x=0.5
-60
8
9
10
11
12
13
14
15
16
Frequency (GHz)
98