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2021-05-18
A Compact Broadband Circularly-Polarized Patch Antenna with Wide Axial-Ratio Beamwidth for Universal UHF RFID Applications
By
Progress In Electromagnetics Research C, Vol. 113, 1-11, 2021
Abstract
A compact broadband circularly-polarized (CP) patch antenna with a wide 3-dB axial-ratio (AR) beamwidth is proposed for universal ultra-high-frequency (UHF) radio frequency identification (RFID) applications. The proposed antenna consists of four triangular radiation patches and a compact feed network. Each of the radiation patches is grounded by shorting pins for 3-dB AR beamwidth enhancement and patch miniaturization. The feed network having a miniaturized hybrid coupler and two trans-directional couplers is proposed for good circular polarization. Measured results show that the -10-dB impedance bandwidth of the antenna is 18.4% (820-986 MHz); the 2.5-dB AR bandwidth is 32.8% (700-975 MHz); and the gain is 5.12 dBic. The measured 3-dB AR beamwidths for the planes of phi = 0° and phi = 45° are 177° and 190°, respectively. The overall antenna size is 0.408λ0 × 0.408λ0 × 0.053λ0 at 900 MHz.
Citation
Zhongbao Wang, Ya-Nan Wang, Xinhong Liu, Hongmei Liu, and Shao-Jun Fang, "A Compact Broadband Circularly-Polarized Patch Antenna with Wide Axial-Ratio Beamwidth for Universal UHF RFID Applications," Progress In Electromagnetics Research C, Vol. 113, 1-11, 2021.
doi:10.2528/PIERC21032704
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