Compact circularly polarized suspended microstrip antenna with "Swastika" shaped slot

Abstract

In this paper, a suspended, compact, circularly polarized microstrip antenna with “SWASTIKA” shaped slot has been introduced which can be operated within the ISM band covering the range of 433 MHz—434.79 MHz. The antenna has been designed using two 1.59 mm FR4 substrate layers with an air gap of 1.59 mm. The antenna has been optimized using method of moment based commercially available electromagnetic simulator. A fair response of less than –10 dB return loss and less than 3 dB axial ratio has been observed for the proposed bandwidth. Based on the optimized configuration, an antenna is fabricated for ground penetrating radar (GPR) application.