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Design of Compact Circularly Polarized Microstrip Patch Antenna with T-slits Loading  

김영두 (경기대학교 전자공학과)
신경섭 (경기대학교 전자공학과)
원충호 (경기대학교 전자공학과)
이홍민 (경기대학교 전자공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.41, no.10, 2004 , pp. 103-108 More about this Journal
Abstract
In this paper, a compact patch antenna with four T-slits fed by crossed aperture coupling is proposed for miniaturized Portable GPS handsets. The mechanism for compact size antenna is investigated with the behavior of the currents on the radiating patch. The equivalent surface current path due to the slits is lengthened, reducing the resonant frequency at a fixed patch size. The results of embedded T-slits for compact antenna size show that the resonant frequency is significantly lowered from 2.545GHz to 1.575GHz, corresponding to a 44.65% antenna size reduction compared to reference design. Experimental results show that good CP radiation patterns are obtained and impedance bandwidth (VSWR $\leq$ 2), 3dB axial ratio are about 21MHz, 19MHz at the center resonant frequency, respectively.
Keywords
compact antenna; circularly polarized; GPS antenna; slit loading;
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