Performance Enhancement of Patch Antenna Using RIS and Metamaterial Superstrate for Wireless Applications

This paper proposes a single feed circularly polarised patch antenna with reactive impedance surface (RIS) and metamaterial superstrate (MS) to improve bandwidth and gain for Wi-Fi and Wi-Max applications that demand high gain, wide band, and directional antennas. In this paper, we demonstrate the performance of several antenna designs, including a slot-loaded patch on a single substrate, an antenna on a dual layer substrate with RIS, and an antenna with RIS and MS. The cavity formed by the superstrate and antenna ground plane functions as a Fabry-Perot resonator (FPR) that enhances bandwidth and gain simultaneously. The final optimised antenna has a significantly wider impedance bandwidth (IBW) of 17.32% (5.01 GHz–5.96 GHz) and an axial ratio bandwidth (ARBW) of 6.29% (5.23 GHz–5.57 GHz) than the conventional slot loaded patch antenna. The proposed antenna gain is 11.73 dB, which is around 9 dB increase over the gain of a standard antenna. © 2023, Electromagnetics Academy. All rights reserved.