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A Novel Triangular Antenna for UWB CommunicationsDr. Arun Raaza1, P. Sathish Kumar1and K. Ramesh1

1Centre for Advanced Research and Development, VELS University, Chennai - 600117, India

ABSTRACT

A novel triangular antenna for beam steering applications is proposed. The triangular antenna has three feeding pointseach on the edge points of three conducting strips, which when excited one at a time steer the beam at step of 120throughout the 30 of space and the antenna operates at .!"#$ and %"#$ thus providing multi&channel operation inthe '() region.KEYWORDS

Beam Steering, Triangular Antenna, Ultra Wide Band and Multichannel

Correspondence

Dr. Arun Raaza, Research Scientist, Centre for Advanced Research and Development, VELS University, Chennai - 600117, India

1. INTRODUCTION

The modern era of communication has witnessed wideincorporation of pattern steerable antennas. Therecentl* proposed s+uare loop antenna 1- for patternsteerable applications when fed one at a time steers thebeam at step of %0, operates at .2"#$ and has a gainof /.%d). This letter proposes three feed triangularantenna structure which when fed one at a timegenerates a titled beam, steers it in steps of 120 andoperates in .!"#$ and %"#$ providing multi&channeloperation in '() region. The multi&channel operationand high gain is the e* advantage of the triangularantenna over 1-. oreover, since the triangular is as*mmetric antenna lie s+uare loop 1-, it also taclesthe problem of polari$ation randomness and parametervariations which were introduced b* the single ormulti&turn rectangular beam steering spiral t*pe

antennas 2&-. As with 1-, the design of the triangularantenna is intended for vertical polari$ation s*stemsonl* and hence, all the tilted beams of interest have thepolari$ation dominance in the direction of 4. Thetriangular antenna is deplo*able in base stations for(iA5 applications, smart wireless devices and hashuge potential for future generation wirelesstransceivers. 6n addition, the beam steering propert* oftriangular antenna maes wireless device to steer mostof its radiated power at a target direction, resulting in amuch lower loss of signal power in the unwanteddirections and improves the longevit* of the devicebatter*. This propert* maes triangular +uite suitablefor militar* based applications.

2. ANTENNA CONFIGURATION7ig. 1 shows the top and side view of the triangularantenna, the antenna has conductor arm side lengthl830mm, trac width w81.mm and the whole unit is

baced b* a conducting ground plane. The antenna hasa permittivit* of 3. and a thicness of h812mm. Theantenna has a total of three feeding points. 6n view ofthe fact that the antenna is fed from the edges itsfeeding configuration is referred to as 9dge pointsfeeding: and is denoted b* 9:. #ence, the threefeeding point configurations are A, ), and ;. 7ig. ?, it is observed that theantenna generates a tilted beam >@max82/0 and 4max81/?. 7or A configuration the @max is 2/0, for )configuration the @maxis 10 and for ; configurationthe @maxis 30 the titled beam points awa* from thefeeding point. 7ig. 3 and shows the conical radiationpattern cuts for antenna A,) and cconfiguration inthe direction of maximum radiation at .!"#$ and%"#$ respectivel*.

5. BEAM SWITCHING7ig. shows the three dimensional radiation pattern1d) cone for 4for all the three feeding configuration.The beam for configuration Aat .!"#$ has 4max8/and @max8%0, ) has 4max8/ and @max8210 and;has 4max8/ and @max8 330. Again the beam forconfiguration Aat %"#$ has 4max81/ and @max82/0,) has 4max81/ and @max810and ;has 4max81/

and @max8 30. This shows that 4max for both .!"#$and %"#$ remains constant at / and 1/ respectivel*where as @max varies in steps of 120. Thus b*selecting each of the three feeds in se+uence acomplete coverage of 30 degree space can becovered in steps of 120, reali$ing a pattern steerableantenna. The average gain beams for all the 3configurations is %. d) for .!"#$ and %.%d) for%"#$ and the* are linearl* polari$ed in the direction of4.

6. FIGURES

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7ig. 1Top and side view of triangular antenna with three feeds

7ig. 2 eturn loss

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7ig. 3a

7ig. 3b

7ig. 3c

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7ig. 3d

7ig.3 adiation pattern of antenna for .! "#$

a Bb? @max8%0 B 4max8/ for A

c? @max8210 for )

d? @max8330 for ;

7ig. a

7ig. b

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7ig. c

7ig. d

7ig . adiation pattern of antenna for %"#$

a Bb? @max82/0 B 4max81/ for A

c? @max810 for )

d? @max830 for ;

7ig. Cne d) radiation cone for all the three feeds

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7. CONCLUSIONA triangular antenna with three s*mmetrical feedingpoints is proposed for beam steerabilit*. The feedingpoints are located at the edges of the three conductingstrips, which when excited one b* one generates threetilted beams at step of 120 covering complete space infront of antenna.

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