Design of Wideband Circularly Polarized Capacitive fed Microstrip Antenna

Abstract

In this paper, a wideband circularly polarized Microstrip patch antenna is proposed. It is a Microstrip square patch, truncated in opposite corners, suspended above the ground plane. The geometry incorporates the capacitive feed strip which is fed by a coaxial probe. The proposed structure is designed at centre frequency of 1.375 GHz and simulated using ANSOFT HFSS. The Impedance bandwidth (Return loss < -10 dB) is 32% at the design frequency of 1.375 GHz, ranging from 1.15GHZ -1.6 GHz is obtained The 3 dB axial ratio Bandwidth(AR BW) is from 1.26-1.49 GHz i.e., 16% at the centre frequency of 1.375 GHz. The performance of the antenna is discussed using parameters such as Return loss, axial ratio and radiation pattern.