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An eye-shaped segmented (ESS) antenna is presented for ultra-high frequency (UHF) near-field radio frequency identification (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 × 50 mm 3 .The measured bandwidth is around 11 MHz (860-871 MHz) under the condition of VSWR less than 2.0, which covers the Europe standard (865 MHz-868 MHz) 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 16.1 cm and 8 cm, respectively.The ESS antenna is desirable for UHF near-field RFID reader applications. INTRODUCTIONAntennas, which directly affect the stability and reliability of the radiofrequency identification (RFID) system, receive a lot of attention.Usually, RFID can be used, for example, in identifying objects in warehousing, supply chain management, and other automation
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Li et al. (2011) studied this question.
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