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TRUNCATED TIP TRIANGULAR

MICROSTRIP PATCH ANTENNA

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Electronics Communicatio DepartmetNati oalnstitute ofTecholo,Surathl,Kaataka, Idia

chaturvediashvinhoo co i

,lt & Cut pttArya Istitute of Engieering ad Techolo ,Jaipur, Rajastha, Idia

h9yg@ff.mnhyv 98@yh..n

Asc: This paper presents a design of triangular microstrip

antenna with truncated tip and experimentally studied on AnsoDesigner v2.2.0 soware. This design technology is achieved by

cutting all three tips of the triangular microstrip antenna and

placing a single coaxial feed. Triangular patch antenna is

designed on a FR4 substrate of thickness 1.6 mm and relative

permittivity of 4.4 and mounted above the ground plane at a

height of 6 mm. Bandwidth as high as 11.07% are achieved with

stable pattern characteristics, such as gain and cross polarization,

within its bandwidth. Impedance bandwidth, antenna gain and

return loss are observed for the proposed antenna. Details of the

measured and simulated results are presented and discussed.

Keywords - Microstrip antenna, Radiation pattern, Returns loss

I. INTRODUCTION

In high perfoace aircra, spacecra, satellite, and missile

applications where size, weight, cost, perfoance, ease of

installation, low prole, easy integration to circuits, high

efciency atennas may be required. Presently there ae many

other goveent and commercial applications, such as

mobile radio ad wireless communication.[]To meet these

requirements microstrip antenna can be used. These antennas

are low prole, conformal to plan and non-planar surface,

simple ad inexpensive to maufacture using mode printed

circuit technology, mechanically robust when mounted on

rigid sface, compatible with IC designs ad when the

paricula shape ad mode ae selected they are ve versatile

in terms of resonat equency, polaization, eld patte and

impedace. Microsip tenna consist of a ve thin metallic

strip (patch) placed a small aion of a wavelength above a

ground plae. The patch ad ground plane are separated by

dielectric material. Patch and ground both are fabricated by

using conducting material. [2]

978-1-4244-6908-610$26.00 2010 EEE

22

However the major disadvantage of the microstrip patch

atenna is its inherently naow impedance bdwidth. Muchitensive reseach has been done in recent yeas to develop

badwidth ehacement techniques.[9] These techniques

includes the utilization of thick subsates with low dialectic

constat .The use of electronically thick substrate only result

in limited success because a lage inductance is itroduce by

the increased length of e probe feed, resulting few

percentage of bandwidth at resonat equency.

In this paper, triagula microstrip atenna with truncated all

three tips is proposed. e patch mounted on FR4 substrate

(thickness=1.6mm) ad above om ground plane at a height

of 6mm. It is fod that proposed design ca also cause

signict lowering of atenas ndamental resonant

equency due to increased length of the probe feed.

II. ANTENA DESIGN

Designing an tenna in the Wi-max bad meat that the

atena dimension could be bulky which is un-welcomed.

Owing to it objective is to design a reduced size wide bad

microstrip tenna; the design idea was taen om broadbad

antennas to mae the antenna work in a lage band of

equencies of the may broadbd antenas, triagular patchantenna was chosen. [4]Hence the chosen shape of the patch

was cutting of all three tips, with a aim to achieve smaller

size antenna.[5] The geometry of triangula microstrip patch

antenna is presented in g. with ont view d side view.

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Fig.! Geometry of proposed triangular microstrip antenna with dimensions

a0.45mm,b=7.9mm,c=3.07mm, d=9mm,h=6mm,t=1.6mm.

This triangula microstrip patch antena with all three

truncated tip is fabricated on a FR4 substrate of thickness 1.6

mm ad relative permittivity of 4.4. It is mounted above the

ground plane at height of 6 mm[6] In this work co-axial or

probe feed technique is used as its main advatage is that, the

feed can be placed at y place in the patch to match with its

input impedance (usually 50 ohm). The soe used tomodel d simulate the trncated tip trigula patch tenna

was Anso designer V-2.2.0, it can be used to calculate and

plot re loss, VSWR, radiation patte, smith chart d

various other paraeters.

III. SULTS A DISCUSSION

The proposed antenna has been simulated using Anso

Designer v-2.2.0 soae [10]. Fig.2 shows the vaiation of

retu loss with equency. Plot result shows resonat

equency 3.43 GHz. And total available impedace band

width of 380 z that is 11.07% om the proposed antenna.Minimum 37.64 db re loss is available at resonat

equency which is signicant. Fig.3 shows the input

impedance loci using smith chart.

Input impedace crve passing ne to the 1 nit impedace

circle that shows the perfect matching of input. Fig.4 shows

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Fig. 2 Retu loss vs. Frequency curve for proposed tenna.

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Fig. 3 nput impedance loci using smith chart.

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the VSWR of the proposed atenna that is 1: 1.03 at the Fig. 4 VS vs. Frequency curve for proposed tenna.

resonat equency 3.43 GHz. Good broadside radiation

patte obtain in g.5

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90

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Fig. 5 Radiation patte of proposed ntenna.

IV. CONCLUSIONS

6.

The design has demonstrated that a single probe feed

trigula patch antenna wi uncated tip can be used to

form an antenna with impedace bandwidth of 11.07%

working in Wi-max wireless communication system with

resonat equency 3.43 GHz. These mode communication

systems require atenas with broadband ad/or multi

equency operation modes. ese goals have been

accomplished employing slotted patch for the radiating

element, with the aim to preserve compactness requirements

and to maintain e overall layout as simply as possible adkeeping the realization cost ve low. In e by cutting slots

on triangula microstrip antenna reduced patch size ad

improved badwidth ca be achieved.

FERENCES

[I] James, .R. and Hal, P.S.: Handbook of Microsip Antennas' (Peter

Peregrinus)

[2] Constantine A. Balanis : Antenna Theo, Anasis and Desi' (JohnWiley & Sons)

[3] Lu JH, Tang CL, Wong KL, 'Novel dual-frequency and broadbanddesigns of the slot-loaded equileral Triangular Microstrip Antenna IEEE

Trans. Antennas Propa 2000;48;1048-54.

[4] Row JS. 'Dual-frequency triangular planar inverted-f Antenna IEEE Tran

Antennas Propag 2005;53;874-6.

[5] Kai-Fong Lee, Kwai- Mn Luk, Jashwant S. Dahele, 'Characteristics of

the Equilateral Triangular Patch Antenna IEEE Tran. Antennas

Propag.988;36;1510.

24

[6] C. L. Mak, K. M. Luk, K. F. Lee, Wideband Triangular Patch Antenna

lEE. Proc. Microwave Antennas Propag. 1999.

[7] Shan-Cheng Pan nd Kin- Lu Wong, Dual Frequency Triangular

Microstrip Antenna with Shorting Pin IEEE Tran. Antennas

Propa1997;45;1889

[8] D.M. Pozar and D. H. Shaubert, 'Microstrip Antennas : The Analysis and

Design of Microstrip Antenna nd Array IEEE Press,Inc., 1980.

[9] L . Bahl and P. Bhartia, 'Microstrip Antennas, Artech Hous e, Dedham,MA,1980.

[10) Ansof Designer, wwwansof.com