Design of Wideband Circularly Polarized Capacitive fed Microstrip Antenna

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 1.375GHz and simulated using ANSOFT HFSS. The Impedance bandwidth (Return loss < -10dB) is 32% at the design frequency of 1.375GHz, ranging from 1.15GHZ -1.6 GHz is obtained The 3dB 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. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of ICCTSD 2011