Analysis of Circularly Polarized Rectangular Microstrip Antenna

In this communication three different techniques have been used to obtain the circular polarization and their results are compared using cross slot at center of patch, corner truncated patch & I-shape slot. The 3dB axial ratio bandwidth are1.9,1.68% and 0.92% for cross slot, corner truncated patch and I-Shape slot respectively. It is observed that axial ratio bandwidth is higher in case of cross slot at Centre of the patch. Almost stable gain is achieved during the entire frequency of operation. Prototype of all three antennas are fabricated and measured result are compared with simulated result for the validity of design.