±45° Linearly Polarized Slot-Coupled Patch Antenna for Millimeter-Wave Applications

Abstract

A slot-coupled patch antenna working at 28 GHz with dual ±45° slant polarization is reported. The patch antenna is excited by a cavity backed slot. To improve the impedance matching, the patch antenna is truncated at each corner. The antenna shows the advantages of high polarization discrimination (XPD), low profile and simple configuration. To validate its performance, an antenna array composed of 2×8 of the proposed antenna elements is designed, prototyped, and tested. The experiment shows that the antenna array has an impedance bandwidth of 26.2-30GHz and the maximum gain is 16.7 dBi.