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This paper presents the novel design of a wideband circularly polarized (CP) Radio Frequency Identiflcation (RFID) reader microstrip patch antenna for worldwide Ultra High Frequency (UHF) band which covers 840{960MHz. The proposed antenna, which consists of a microstrip patch with truncated corners and a cross slot, is placed on a foam substrate (r = 1:06) above a ground plane and is fed through vias through ground plane holes that extend from the quadrature 3dB branch line hybrid coupler placed below the ground plane. This helps to separate feed network radiation, from the patch antenna and keeping the CP purity. The prototype antenna was fabricated with a total size of 225 £ 250 £ 12:8mm 3 which shows a measured impedance matching band of 840{1150MHz (31.2%) as well as measured rotating linear based circularly polarized radiation patterns. The simulated and measured 3dB Axial Ratio (AR) bandwidth is better than 23% from 840{1050MHz meeting and exceeding the target worldwide RFID UHF band.
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Mireles et al. (2012) studied this question.
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