A MILLIMETER WAVE MICROSTRIP
PATCH ANTENNA WITH CPW FEED
GARIMA SANYAL
Department of Electronics and Communication Arya College of Engg and IT,Rajasthan Technical University
Jaipur,Rajasthan,India [email protected]
KIRTI VYAS
Department of Electronics and Communication Arya College of Engg and IT,Rajasthan Technical University
Jaipur,Rajasthan,India [email protected]
Abstarct:
In this work a coplanar waveguide fed rectangular microstrip patch antenna with U slot at 40 Ghz is designed and simulated. Simulated results are presented by using Ansoft HFSS 13 software, a full wave electromagnetic field simulator for arbitrary 3D volumetric passive device modeling that takes advantage of the familiar Microsoft Windows graphical user interface.The patch element is been placed on FR4 Epoxy substrate with relative permittivity 4.4 at a height of 1.8 mm. The gain of the proposed antenna is 5dB.This antenna is small size,cheap,compact,easy to fabricate ,achieve return loss of -17.8dB at 40GHz which ranges to -25 dB at 10 0GHz and good VSWR.The approach presented in this paper offers major advantages in millimeter wave applications as in radar communication.
Keywords: Coplanar Waveguide(CPW); Microstrip Antenna; Millimeter Wave Applications; Voltage Standing Wave Ratio(VSWR).
1. Introduction
Microstrip antennas have a variety of applications in widespread wireless communication system. Inmicrowave and even millimeter-wave frequency ranges microstrip antenna is very attractive because of the advantages, which is very compact, light and not costly. It can be interconnected with other RF components neatly and has less space in a component configuration. It is also easy to be fabricated on the planar type substrate as antenna component and also it is convenient to change the shape of patch antenna for the purpose in limited space case by case. Hence, in many papers lots of modified types of microstrip antennas have been suggested so far. The microstrip patch antennas are having many advantages such as low profile,versatile, conformal and low-cost devices. The advantages of microstrip antennas make them suitable for various applications like, vehicle based satellite link antennas [Mailloux(1981)][Garg(2001)][Kumar(2003)] global positioning systems [Pozar(1996)] radar for missiles and telemetry and wireless communication devices [Pozar(1996)]. However these antennas have limitation of narrow bandwidth. Some of the common techniques proposed by researchers for widening the bandwidth are; increasing the height of antenna substrate [Pozar(1996)] using aperture coupling method [Pozar(1996)] [Targonski(1998)] or using stacked patch structure [Targonski(1998)].
Coplanar waveguide (CPW) fed antennas have been increasingly studied in recent years. The coplanar waveguide, compared with the microstrip line, has advantages such as low radiation loss, less dispersion, uniplanar configuration and easy mounting of shunt lumped elements or active devices without via hole as for the microstrip line. In some practical radiation system, where the semiconductor device has a CPW output terminal, a CPW fed antenna[Smith and Williams (1992)][Abed(2008)] is usually required to form a smooth integration with the device.
In this paper, we tried an antenna which consists of a patch having U-slot, surrounded by closely spaced ground conductor and a CPW feed line It is designed in millimeter-wave [Pozar(1983] [Bhartia(1991)] frequency bands of 40 GHz. The proposed antenna design is compact and suitable at higher frequencies from 40-100 GHz. Simulation results confirm its good performance in return loss, gain and VSWR. Rest of the paper is organized as follows: the geometrical configuration of the designed antenna is given in Section 2. The simulated results with discussion are presented in Section 3. Finally,Section 4 concludes the work.
2. Methodology
In our design, we propose to use a rectangular patch radiator by beveling the middle of the radiating
used, wh simulatio method).
2.1 Anten The Rect Calculati
where c= free sp εr=dielec Effective
The actu
where
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ual length of th
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t easy for th mization was p
ation ostrip patch an
(W):
of light of substrate nstant is calcu
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Extension:
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na with cpw fe strate.The heig CPW feeding
Hz.
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4) given below
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3. Result
The desi designed Table.1.T the desig 4.The des
ts and Discus
igned antenna d model of the The return los gned rectangul signed antenn
Param
Length
Width
Dielec
Length
Width
Length
Width
Height
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a configuratio e antenna is o ss of the propo
lar microstrip na can be used
Table 1. Dime
meters
h of the patch
of the patch (
ctric substrate
h of feed line(
of feed line (
h of substrate
of substrate (
t of substrate (
on of Fig.1 is optimized.The
osed antenna i p antenna is sh d for 40-100 G
Fig. 2. R
ensions of the pro
(Lp)
(Ws)
(εr)
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Return loss Vs Fr
oposed antenna.
Value
12mm
23.6mm
4.4
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using HFSS imensions of Fig.2..The volt
.The gain of t
requency
simulator.Usi the microstri tage standing the designed a
ing this simu ip antenna are wave ratio (V antenna is sho
4.Conclu This stud presented structure CPW fee suitable applicatio 5. Ackno
I would l for their c
Refrence [1] Abed Lett..4 [2] Bhart [3] Garg, [4] Kuma [5] Maillo [6] Pozar Letter usion
dy was focus d shows the
.The proposed ed lines.The m at higher fre ons.
owledgement
like to express continuous su
es
,D.; Kimouche,H 44(17), pp. 1003-tia,P.; Rao,K.V.S , R.; Bhartia,P.; B ar, G.; Ray, K.P.( oux, R. J.; et al.(1 r, D. M. (1996):
rs.
ed on the de e harmonious d antenna con microstrip patc equencies due
s my thanks to upport and enc
H.; Atrouz,B. (2 -1005,November .; Tomar, R. S. (1 Bahl,I.; Ittipioon,A
(2003): Broadban 1981): Microstrip A review of ap
Fig. 3.
sign of novel s coexistenc nfigurations a ch antenna at e to good gai
o the departm couragement d
2008): Small siz 2008. 1991): Millimeter A. (2001):Micros nd Microstrip An p antenna technol perture coupled m
. VSWR Vs Fre
Fig. 4. Gain
l antenna top ce of variou
are able to co 40GHz will in.This anten
ment of ECE a during this wo
ze printed CPW
r Wave Microstri strip Antenna Des ntennas, Artech H logy, IEEE Trans microstrip antenn
equency
pology.The n us propagatio ompactness an
work properly na is useful
and managem ork.
W-fed antenna for
p and Printed Cir sign Handbook, A House Inc., MA, E s. Antennas and P nas, History, ope
new form of n modes bui nd dual polar y. This antenn
in millimeter
ent of Arya C
r ultra wideband
rcuit Antenna, Ar Artech House Inc England. Propagation, 29, p
ration, developm
f the patch ilt into a sin rization capab na has smalle r-wave comm
College of Eng
d communicatio
rtech House, Bost ., MA, England.
pp. 2-24. ment, and applica
antennas ngle layer bility with r size and munication
gg. and IT
n, Electron.
ton.
ations, IEEE
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[8] Smith, R. L. ; Williams, T. J. (1992): Coplanar waveguide feed for microstrip patch antennas, Electron.Lett.28(25), pp. 2272-2274, December 1992.
[9] Targonski, S. D.; Waterhouse, R. B.; Pozar, D.M. (1998): Design of wide band aperture coupled stacked microstrip antennas, IEEE
