Abstract
A minimized wideband antenna array is presented for ultra-high frequency (UHF) radio frequency identiflcation (RFID) reader applications. The antenna array consists of two E-shaped patch antennas and a feeding network, with the overall size 200 £ 100 £ 20mm 3 . The feeding network could efiectively decrease the antenna mutual coupling and improve the bandwidth. The measured bandwidth is about 68MHz (896{964MHz) under the condition of voltage standing wave ratio (VSWR) less than 2, which covers various RFID bands including North American (902{928MHz), Chinese (920{ 925MHz) and Japanese (952{955MHz). The average gain is 4.5dBi in UHF band. The principles of the antenna and the feeding network are also discussed and analyzed in this paper. At last, the key parameters are studied and show the antenna robustness.
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