A Broadband Low-Profile Dual-Polarized Antenna Based on a Metasurface

Abstract

This article presents a wideband low-profile dual-polarization antenna based on a metasurface (MS). The antenna consists of a 4à 4 metasurface array made up of 16 circular metal patches, a radiating patch, and a metallic ground plane. The metasurface excites the surface waves of the radiating patch to generate multiple resonant points, thereby broadening the antenna bandwidth. In addition, two rectangular cross-slot structures at the center of the patch enhance port isolation. Finally, a prototype with dimensions of 46 mm à 46 mm à 3.2 mm (1.28λâ à 1.28λâ à 0.88λâ ) was fabricated. Measurement results show that the antenna achieves a return loss better than -10 dB and an isolation better than -16 dB within the operating bandwidth of 6.38â 10.3 GHz. It can be concluded that the experimental results of the antenna are in good agreement with the simulation results.