DIAMOND SHAPE MICROSTRIP ANTENNA USING “SLOTS” AT 2.5 GHz,
ANTENNA EFFICIENT TO ACHIVE HIGH DIRECTIVE GAIN
Rupal Shivhare1(M.E), Rachit Jain2(Assistant Professor)
rupalshivhare@gmail.com, Rachit.itm@gmail.com
ITM College Gwalior M.P. (india) , ITM College Gwalior M.P. (india)
Abstract— The Design of a Diamond shape slotted
microstrip antenna with circular polarization radiation.
The antenna have a 1.6 mm glass Epoxy substrate and
single rectangular microstrip radiating patch, Where the
radiating efficiency is high and also high Gain. The
results show that the proposed antenna is able to achieve
VSWR less than 2, antenna efficiency and radiation
Efficiency above the 90% the percentage bandwidth is
25%.
2
Substrate Material Uses- The first design step is
to choose a suitable dielectric substrate of appropriate
thickness h and loss tangent. A thicker substrate, besides
being mechanical strong, will increases the radiate power,
reduces conductor loss, and improved impedance
bandwidth however, it will also increase the weight,
dielectric loss, surface wave loss, and extraneous
radiations from the probe field. Substrate dielectric
constant εr plays a role similar to that of the substrate
thickness.
Keywords: Diamond shape, microstrip, slotted,
1
Introduction- Antennas are a very important
component of communication systems. By definition, an
antenna is a device used to transform an RF signal,
traveling on a conductor, in to an electromagnetic wave
in free space the broadband circularly polarized
microstrip antennas play a vital role in wireless
communication due to its low-profile, small-size and
light weight. As well know, a circularly polarized wave
can be obtained when spatially orthogonal modes are
excited with equal amplitude. Conventional designs of
microstrip antennas for circular polarization are usually
achieved by truncating patch corners [1], cutting
rectangular slots in Diamond shape rectangular patch.
Fig. 1: Geometry of Proposed antenna on IE3D
3. Antenna design- Fig. 1and 2 shows the geometry
of the proposed Diamond Shape microstrip antenna, The
radiating rectangular patch, printed on a substrate of
thickness h and relative permittivity εr, has the dielectric
material thickness is 1.6mm the length of both side, Lp
=27mm,Wp=37mm and has a finite ground of Lg = 36.6mm
,Wg = 46.6 mm is excited by the two feed disks, which are
oriented in orthogonal directions and have the same
distance of feed point is X= 17 mm. and Y=6.6mm
4.
Simulated results - To validate whether the design
technique is applicable, the antenna has been simulated with
IE3D Fig.3, Fig.4 and Fig. 5 shows the Return loss verses
Frequency, VSWR versus Frequency and smith chart of the
proposed antenna .From the simulation results, Fig 6, 7 is 3D
radiation pattern,Fig 8,9 shows 2D pattern of radiation, Fig
10,11 indicate gain and Directivity of antenna and Fig 12 and
13 shows the axial ratio and efficiency of antenna . We
observe that the proposed antenna is able to achieve the
bandwidth is 25%, and the VSWR less than 2. The feed point
connected with the coaxial connector, have good equal
amplitude and 90° phase shift, CP radiation can be achieved
[5]. Furthermore, by using the thick air substrate, much wider
CP bandwidth can thus be obtained. The impedance matching
of the antenna can be achieved by fine adjusting the feed
position, radius of feed disks. The distance between the
radiating patch and the ground plane is1.6mm.
.
Fig. 5: Smith chart of S parameter
Fig. 2: 3D view of Geometry
Fig. 3: Return loss Vs frequency.
Fig. 4 : VSWR versus frequency
Fig.6: 3D Radiation pattern view
Fig.7: Side view of 3D Radiation pattern view
Fig.11: Directivity Vs frequency
Fig.8: 2D Radiation pattern view of gain
Fig.9: 2D Radiation pattern view of Directivity
Fig.12: Axial ratio Vs frequency
Fig.13: Efficiency Vs frequency
Fig.10: Gain Vs frequency
Table.1 content the antenna parameter
Fo ( operating frequency)
2.5 GHz
h (height of dielectric)
1.6 mm
εr (dielectric constant)
4.4 mm
Lp (length of patch)
27 mm
Wp (width of patch)
37 mm
Lg (length of patch)
36.6 mm
Wg (width of patch)
46.6 mm
Fr (resonant frequency)
2.5 GHz
Table.1
Table.2 content IE3D output
Frequency
in GHz.
2.5
Resonant
Frequency
GHz
2.5
IE3D output
(return loss )
-21.25db
Table.2
In this paper, a new design of Diamond shape microstrip
antenna with 2.5 GHz. The antenna have an output by using
IE3D antenna resonant at the frequency of 2.5and have
greater return loss of -21.25 db. A thick air substrate is used
in the present proposed design, and impedance matching is
obtained through the rectangular radiating patch. The results
show that the proposed antenna is able to achieve VSWR
less than 2 and the return loss is less then -10.db.
4. Conclusions- Characteristics of rectangular Diamond
Shape microstrip antenna have been analysis, The
proposed antenna is achieved gain of 4 db, efficiency is
more than 90% and band limit is lies between the WLAN
region, microstrip antenna is able to achieve VSWR less
than 2 and the return loss is less the -10db and in this paper
the bandwidth is 25% .
References
[1] Z. L. Dafalla, W. T. Y. Kuan, A. M. Abdel Rahman,
and S. C. Shudakar, “Design of a Rectangular Microstrip
Patch Antenna at 1 GHz”, Rf And Microwave Conference,
October 5 - 6- 2004, Subang, Selangor, Malaysia
[2] C.Y. Chiu, C.H. Chan and K.M. Luke, “Study of
slotted microstrip patch antennas with folded patch feed ”,
Microwave Antennas propagation., vol. 152, no. 5,
October 2005
[3] C -Y
Huang,
J-Y Wu
and
K-L
Wong ,
“Cross-slot-coupled microstrip antenna and dielectric
resonator antenna for circular polarization”,. IEEE Trans
on Antennas and Propagate, 1999, PP-47
[4] S Matsuzawa and K Ito. Circularly polarized printed
antenna fed by coplanar waveguide. Electronic. Letter, Vol.32
No.22, 1996
[5] S. D. Targonski and D. M. Pozar. Design of wide- band
circularly polarized aperture coupled microstrip antenna. IEEE
Trans. on Antennas and Propagate, vol. 41, pp. 214-220, 1993.