Antenna Design for UHF RFID Tags Using Two Coupled Patches

Abstract

In this paper we present a patch antenna with compact low profile for Ultra-High Frequency (UHF) Radio Frequency Identification (RFID), by using two coupled patches by passing C-shaped, wide impedance bandwidth at half power of 152 MHz is obtained for UHF (860-960 MHz) RFID. The lengths of the two patches are slightly different from each other so that they resonate at two different frequencies adjacent to each other to form a wide width strip impedance to cover the entire range of the UHF band. The patch antenna has a planar profile proposed eliminating the need for and against the multilayer structure thus leading to ease of manufacture and reduced cost. The design of the proposed antenna is simulated using HFSS. Simulation results presented show a satisfactory performance when the antenna is mounted on various sizes of metal plate.