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

A wideband, low-profile, dual-polarized antenna using a metasurface (MS) is proposed in this paper. This design consists of a pair of crossed dipoles, an MS, a metal cavity and two baluns. The proposed MS acts as an artificial magnetic conductor (AMC), which is designed for the +/- 90 degrees reflection-phase bandwidth of 1.4-2.9 GHz. Compared with the 0.25 lambda 0 profile of the traditional crossed dipoles, the profile is reduced to 0.15 lambda 0 by using the in-phase reflection characteristics of the MS, which realizes the utilization of space. The measured results show that the antenna has a 10 dB return loss of 68.2% with isolation of more than 30 dB (1.45-2.95 GHz). The realized gain is 9 dBi with +/- 1 dBi variation, especially exceeding 10 dBi from 2.1 to 2.8 GHz.