Improvement of the gain of UWB antenna using a novel FSS structure based on triangular split ring resonator

This article presents, a novel Frequency Selective Surface (FSS) structure based on metamaterial (MM), to increase the gain and the directivity of an Ultra WideBand (UWB) patch antenna operates between 3.2 and 11.2 GHz. The FSS structure proposed is formed by four Triangular Split Ring Resonators (TSRR) printed on Rogers RO3010 substrate. Using Kramers-Kronig equations, the TSRR structure is analyzed to find the frequency band where it presents negative permittivity. The simulation results for the FSS associated with the patch antenna offers a higher gain referred to an antenna without FSS. The proposed antenna has a low profile, is of small size ( 45 mm×50 mm×12.73 mm)), and offers a gain of 7.71 dBi for WIMAX (3.5 GHz), 6.45 dBi for WLAN (5 GHz), 8.5 dBi for HIPERLAN2 (5.4 GHz-5.7 GHz) and 7.5 dBi for X-band (10 GHz). Our results have shown more favorable outcomes for UWB applications compared with the previously published literature.