Complementary triangular split ring resonator (CTSRR) loaded circularly polarized planar antenna

A miniaturized dual fed circularly polarized square patch antenna is presented. The miniaturization is accomplished by loading one of the feed lines with a complementary triangular split ring resonator (CTSRR). Phase characteristics of CTSRR are optimized to realize a miniaturized feed line and axial ratio less than 3dB over the band. Proposed configuration exhibits a return loss of 10.5dB, gain of 4.7dB and axial ratio of 2.8dB at 4 GHz. A miniaturization of the order of 50% is achieved using CTSRR loaded configuration when compared to the conventional configuration.