Near field UHF RFID tag antenna backed by a conducting loop reflector

A novel UHF printed loop antenna backed by a conducting loop reflector is proposed for near field RFID tag antenna application. The backed conducting loop reflector is adopted to achieve stronger magnetic field distribution along the loop tag antenna in order to work properly in proximity to the water and metallic object. The proposed antenna is constructed on FR4 substrate with the dimension of 30 mm × 30 mm × 3.2 mm. The simulated results exhibit constant current and uniform magnetic distribution to operate frequency at 915 MHz. The near field performance of the proposed antenna is practically verified by the read range measurement and compared with the commercially-available near field tag antenna to offer a promising solution of above-mentioned problems.