A miniaturized circularly polarized (CP) patch antenna is proposed for ultra high frequency (UHF) radio frequency identification (RFID) reader applications. The antenna is composed of a vertical ground, a U-shaped strip, and a square patch with truncated corners. A novel U-shaped strip feed structure is proposed for good impedance matching. Broadband CP operation is achieved by using a thick air-layer substrate (about 0.08λ 0) and selecting an optimal size of the truncated corners. The antenna has an impedance bandwidth (S 11 < -20 dB) of about 141 MHz (861-1002 MHz or 15.1%), a 3-dB axial ratio (AR) bandwidth of about 30 MHz (899-929 MHz or 3.3%), and a gain level of about 7.2 dBi or larger within the 3dB AR bandwidth. The dimension of the antenna is 13 cm x 13 cm x 2.8 cm. The small size and high gain make this element suitable for portable UHF RFID reader applications. © 2012 Springer-Verlag GmbH.
CITATION STYLE
Wang, Z., Fang, S., Fu, S., & Zheng, J. (2012). A miniaturized UHF RFID reader antenna. In Advances in Intelligent and Soft Computing (Vol. 163 AISC, pp. 781–787). https://doi.org/10.1007/978-3-642-29458-7_108
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