Abstract
An eye-shaped segmented (ESS) antenna is presented for ultra-high frequency (UHF) near-fleld radio frequency identiflcation (RFID) applications. The proposed antenna shows in-phase current even though the perimeter of the eye-shaped loop is comparable to the operating wavelength. The ESS antenna is fabricated on a FR4 printed circuit board (PCB) and embedded in a metal cavity with an overall size of 250 £ 180 £ 50mm 3 . The measured bandwidth is around 11MHz (860{871MHz) under the condition of VSWR less than 2.0, which covers the Europe standard (865MHz{868MHz) and agrees well with the simulated results. Finally, as a reader antenna in the RFID system, the measured read distance and read width can achieve 16.1cm and 8cm, respectively. The ESS antenna is desirable for UHF near-fleld RFID reader applications.
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