期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 14, 期 -, 页码 707-710出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2014.2378513
关键词
Axial ratio (AR); broadband antenna; circularly polarized (CP); impedance matching; radio frequency identification (RFID); ultra-high frequency (UHF)
资金
- National Natural Science Foundation of China [61372008]
- Fundamental Research Funds for the Central Universities [2014ZZ0031]
- National Engineering Technology Research Center for Mobile Ultrasonic Detection
A circularly polarized radio frequency identification (RFID) reader antenna is presented for worldwide ultra-high frequency (UHF) applications. The antenna is composed of two coin-shaped patches, a ring-shaped strip, and a suspended feeding strip with open-circuited termination. The measurements show that the antenna has an impedance bandwidth (s(11) < -21 dB) of 22.4% (768-962 MHz) and a stable gain with a peak value of 9.8 dBic. Moreover, it is immune to polarization mismatch with a 3-dB axial-ratio (AR) bandwidth of 15.9% (816-957 MHz) and a 3-dB AR beamwidth of more than 66 degrees. The proposed antenna can be a candidate for universal RFID readers at the UHF band of 840-955 MHz. Due to the fact that the square holes in the center of the coin-shaped patches can embed one additional small antenna, the proposed antenna has the potential to be a dual-or tri-band combined RFID reader antenna, spanning both the conventional UHF and the ISM band of 2.45 or 5.8 GHz.
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