Wideband Circularly Polarized Metamaterial-based Antenna employing Metasurface Structure

Abstract

In this work, a novel wideband compact and low-profile metamaterial-based antenna has been proposed. The introduction of metasurface layer between the patch and ground plane improves antenna's performance, considerably. Our proposed circularly polarized (CP) antenna has been realized by two pairs of radiators. The CP characteristics have been obtained by placing two radiators in X-polarized wave and two in Y-polarized wave. Each radiator is carefully designed with epsilon negative transmission line (ENG-TL) to generate zeroth-order resonance (ZOR). Our proposed antenna achieves a gain of 4.94 dBiC, which is almost 0.58 dBiC higher than the structure without metasurface. Also, the operating bandwidth and the simulated axial ratio bandwidth (ARBW) of our proposed antenna improves to 676.3 MHz and 474.1 MHz.