A novel planar loop tag antenna mounted on the plastic pallets for ultra-high frequency (UHF) radio frequency identification (RFID) system is proposed. By insetting the U-shaped slot and a pair of rectangular parasitic strips into the proposed loop tag antenna, the resonant mode close to ultra-high frequency (UHF) 900-MHz band is excited to enhance the operating bandwidth. The obtained impedance bandwidth across the operating band can reach about 174 MHz (18.8%) for UHF band. Also, with bidirectional pattern, the measured reading distance is about 2.0 m as the proposed loop tag antenna mounted on the plastic pallets.
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