Broadband probe-fed patch antenna with reduced cross-polarisation radiation

This article presents novel designs of broadband patch antennas with reduced cross-polarisation radiation. The design for a 1/spl times/2 probe-fed E-patch subarray antenna fed by using two feeds of a 180/spl deg/-phase shift is first demonstrated. Results for the same technique applied to a broadband single-patch microstrip antenna fed by dual L-strip coupled feeds are also presented. Finally, a new design of a broadband probe-fed E-shaped patch antenna with a U-shaped ground plane is proposed. These broadband designs all show reduced cross-polarisation for operating frequencies within a wide impedance bandwidth.