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2012-06-25
A Novel Wideband Circularly Polarized Antenna for Worldwide UHF Band RFID Reader Applications
By
Progress In Electromagnetics Research B, Vol. 42, 23-44, 2012
Abstract
This paper presents the novel design of a wideband circularly polarized (CP) Radio Frequency Identification (RFID) reader microstrip patch antenna for worldwide Ultra High Frequency (UHF) band which covers 840-960 MHz. The proposed antenna, which consists of a microstrip patch with truncated corners and a cross slot, is placed on a foam substrate (εr = 1.06) above a ground plane and is fed through vias through ground plane holes that extend from the quadrature 3 dB 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 x 250 x 12.8 mm3 which shows a measured impedance matching band of 840-1150 MHz (31.2%) as well as measured rotating linear based circularly polarized radiation patterns. The simulated and measured 3 dB Axial Ratio (AR) bandwidth is better than 23% from 840--1050 MHz meeting and exceeding the target worldwide RFID UHF band.
Citation
Elias Mireles, and Satish Kumar Sharma, "A Novel Wideband Circularly Polarized Antenna for Worldwide UHF Band RFID Reader Applications," Progress In Electromagnetics Research B, Vol. 42, 23-44, 2012.
doi:10.2528/PIERB12051019
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