Design of a bending dipole RFID antenna at UHF band

A bending dipole RFID (Radio Frequency Identification) tag antenna at Ultra High Frequency (UHF) band is presented to meet the requirements of the antenna miniaturization. The overall dimension of the tag antenna is only 55×12 mm2.The input impedance of the antenna is about 43 + j800Ω with Philips EPC UCODE Gen 2 RFID tag microchip. The simulation results show that the designed antenna has a wide impedance bandwidth, covering 840-845MHz and 920-925MHz UHF band, and has a good return loss value and omni-direction, which can meet the practical requirements of RFID tag antenna.