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A Study on the Design of Polarization Selective Antenna for UHF RFID System  

Lee, Sa-Won (Information Communication & Homenetwork, Cheongju College of Korea Polytechnic IV)
Song, Woo-Yong (College of Electron & Information Eng., Cheongju University)
Publication Information
Journal of Advanced Navigation Technology / v.14, no.2, 2010 , pp. 170-175 More about this Journal
Abstract
This article proposed polarization selective antenna for UHF RFID system. The proposed antenna is consist of microstrip patch antenna with dual feeding and two SPDT switches and a SP4T switch and 3dB hybrid coupler. Through control of voltage of switches, the proposed reader antenna can select horizontally linear polarization, vertically linear polarization, left-hand circular polarization (LHCP) and right hand circular polarization (RHCP). The proposed reader antenna satisfied 2:1 VSWR at 902MHz ~ 928MHz. and 3dB under AR(axial ratio). And it can select appropriative polarization with user environment and tag polarization. So it minimize PLF and increased reading distance.
Keywords
reader antenna; linear polarization; circular polarization; polarization regulation; Polarization Loss Factor;
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