Metasurface-based Wideband Multilayer Antenna Incorporated with Holey Superstrate for S-band Applications

This work explains an efficient combination of multilayer metasurface (MS) antenna and metamaterial-based holey superstrate for S-band applications. The presented multilayer antenna consists of five layers. Firstly, layer-1 is the feeding layer, secondly a Teflon substrate layer, thirdly the MS layer that converts linear polarized wave to circularly polarized the fourth layer is an air dielectric layer. Finally, the upper layer is a square-shaped holey superstrate layer placed above the air layer which enhances the overall antenna bandwidth and gain performance. The final multilayer antenna provides a wider impedance bandwidth of 30% (2.64-3.55 GHz), good axial radio bandwidth of 8.09%, an enhanced gain of 7.85 dBi at 3.1 GHz, smaller ka value of 3.50, and good gain-to-area ratio of 9.76 by maintaining antenna compactness.