High Gain Dual-Polarized Meta-surface Antenna

Abstract

A Ku band dual linearly polarized low-profile meta-surface (MTS) radiator antenna has been proposed in this work. The patch is excited using an aperture coupled feed through the slots in a substrate integrated waveguide (SIW). For each polarization, the SIW cavity operates in the second order mode and the antenna is fed using two parallel slots placed close to the maximum E-field in SIW, resulting in a high gain better than 10.3 dBi. The antenna presents 16.9 % impedance bandwidth over a frequency band of 13.5 GHz to 16 GHz, corresponding to $\vert \mathrm{S}_{11}\vert < -10\ \text{dB}$. The antenna is fed differentially using 180° hybrid coupler leading to cross polar levels lower than 25 dB and a port-to-port isolation better than 40 dB between the two polarization ports.