Low Profile CPW Fed Compact Square Slot Antenna with Wide Axial Ratio Bandwidth

A CPW fed circularly polarized square slot antenna that gives rise to a wide axial ratio bandwidth is designed and studied in this article. More than 18.8% (7.7GHz-9.31GHz), 3dB ARBW can be achieved by utilizing L shaped grounded strip in the upper right side and square in opposite to this in the lower left side. To further enrich the 3 dB ARBW of the proposed slot antenna, three slots on the outer periphery (two horizontal and one vertical) are engraved from the ground. These perturbation structures are responsible for current rotation and increment in ARBW. With the optimized value of various parameters, a 3dB ARBW of 73.05% (4.17-8.97GHz, 4.8GHz) concerning central frequency 6.57GHz and IBW of 87.8% (3.56-9.14GHz, 5.58GHz) concerning central frequency 6.35GHz is attained. Also, superb CP radiation patterns have been detected in the direction of main beam (broad-side), with RHCP and LHCP in the +Z and -Z directions, respectively. The overall dimension of offered antenna is 20mm ×20mm×1.0mm.