Abstract
A planar broadband circular tag antenna operated at ultra-high frequency (UHF) band for radio-frequency identification (RFID) system is proposed. By adding a pair of T-arc-shaped strips and parasitic step strips, excitation of multi-resonant modes can approximate reach with the operating half-power band from 848 to 963 MHz, which covers the required bandwidth for worldwide UHF RFID (860–960 MHz) system. Moreover, the measured read distance of this design can reach 3.8 m, and exhibits good unidirectional radiation patterns in the X–Z and X–Yplanes.
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