A Broadband Coplanar Waveguide Grid Array Antenna

Abstract

In this paper, a broadband coplanar waveguide grid array antenna is presented. By using coplanar waveguide, the antenna array can achieve a wider impedance bandwidth is 29% (21.69 - 29.04 GHz). The coplanar waveguide-based antenna has a higher front-back ratio than the convention microstrip grid antenna. The differential probe feed is applied to get a lower cross-polarization level of about -40 dB. The coplanar waveguide-based antenna has the maximum gain value of 12.6 dBi. Due to these advantages of low cross polarization, wide impedance bandwidth, high gain and high front-back ratio, the coplanar waveguide-based antenna can be applied in the 5G millimeter wave communications.