A circularly polarized patch antenna loaded with metamaterial

Abstract

A single-feed circularly polarized (CP) patch antenna loaded with metamaterial (MTM) for broadband operation is presented. The antenna is designed with a truncated corner square patch placed between a lattice of 4 × 4 periodic metal plates and the ground plane. The antenna with an overall size of 32 mm × 32 mm × 3 mm resulted in a |S11| <;-10 dB bandwidth of 4.70-7.48 GHz (44%), and a 3-dB AR bandwidth of 4.9-6.2 GHz (22%). In addition, the radiation characteristics of an antenna showed a good broadside left-hand CP radiation with a small gain variation (7.2-7.7 dBic) within the AR bandwidth.