E‐shaped patch with reactive impedance surface for high gain and broadband circularly polarized antenna

Abstract

SummaryA low‐profile circularly polarized (CP) antenna with high gain and broad bandwidth is aimed at 5‐GHz Wi‐Fi applications using a symmetrical E‐shaped patch. Initially, the radiating element is modeled as a symmetrical E‐shape. An array of 4 × 4 rectangular patches are arranged periodically to make up a reactive impedance surface (RIS) structure. Furthermore, the RIS structure is deployed in the middle of a symmetrical E‐shaped radiating patch and a perfect electric conductor (PEC) ground plane. As a result, the broadband CP is achieved with high gain. The above‐mentioned combinations have achieved a −10‐dB reflection coefficient bandwidth of 21.4% (4.92–6.1 GHz) and a 3‐dB axial ratio (AR) bandwidth of 15.5% (5.25–6.1 GHz), and the antenna has attained a gain of 7.45–7.53 dBic.