Corner Truncated Patch Circularly Polarized Antenna for UHF RFID Applications

This paper presents a design of corner truncated patch circularly polarized antenna for UHF RFID applications. The corner truncated patch antenna is proposed for circularly polarized radiation for UHF RFID applications. The corner truncated patch circularly polarized antenna is 20cm, 20cm and 1.327cm in width (W), length (L) and height (ha), respectively, to propagate the UHF RFID frequency band of 920-925MHz. The radiating patch and ground plane was designed form single sided PCBs with exposed FR-4 substrate. The corner truncated patch and ground plane were placed parallel to each other using air as an intermediary. Antenna simulation results are used to determine the optimal proposed antenna parameters and a circularly polarized antenna are fabricated and exhaustively tested, respectively. The simulated and measured antenna gains are 8. 49dBi and 7. 68dBi, respectively. The simulated and measured HPBW in the XZ-plane and YZ-planes are greater than 65°. And the axial ratio $(AR)\le 3dB$ cover the operating frequency band. The results of simulated compared with the measured are show good agreement. In addition, the proposed antenna is suitable for UHF RFID reader applications.