A Low-profile Wideband Dual-Polarized Antenna with Nonuniform Metasurface

Abstract

A low-profile wideband dual-polarized antenna with nonuniform metasurface is proposed for 2G/3G/4G/IMT applications. The proposed antenna maintains broad bandwidth and stable gain but has a low profile of only 0.17λ₀ at 2.0 GHz, which contributes to the metasurface designed above the radiator. The nonuniform circular elements of the metasurface are set to reduce the coupling between each element, thus stable radiation patterns and low cross-polarization levels can be realized. The test results show a wide impedance bandwidth range from 1.4 GHz to 2.79 GHz (66.3%) for |S₁₁| < -10 dB and high isolation is more than 27 dB. The measured stable gain is 9±1 dBi. In the entire frequency band, stable radiation patterns are achieved with low cross-polarization levels below -18 dB.