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Erschienen in:
2013 | OriginalPaper | Buchkapitel
A Miniaturized UHF RFID Reader Antenna
verfasst von : Zhongbao Wang, Shaojun Fang, Shiqiang Fu, Jun Zheng
Erschienen in: Advanced Technology in Teaching
Verlag: Springer Berlin Heidelberg
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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 0.08
λ
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.