Broadband circularly polarized patch antenna

Abstract

A broadband circularly polarized patch antenna is disclosed. The broadband circularly polarized patch antenna consists of: an L-shaped ground plane consisting of a vertical ground plane and a horizontal ground plane; a radiating metal patch; a probe feed placed coplanarly with the radiating metal patch and connected to the radiating metal patch through the vertical ground plane; and a substrate between the radiating metal patch and the horizontal ground plane. Because the probe feed of the broadband circularly polarized patch antenna of the present invention is placed coplanarly with the radiating metal patch, the required length of the probe feed is greatly reduced and the probe inductance effect on antenna's impedance matching is thus decreased, leading to enhanced circular polarization operating bandwidth. In addition, the broadband circularly polarized patch antenna of the present invention has the features of low cost, high antenna gain, good circular polarization radiation and simple structure. Therefore, the present invention is a valuable implementation in industrial fields.

Dependencies are inferred from the claim text.