Wide Band Single-Pole Circularly-Polarized Fabry-Perot Antenna

摘要

A novel approach is here presented, to design wide band circularly-polarized Fabry-Perot antennas. The proposed method is based on a Green’s function approach. It is proven that a single leaky-wave mode is sufficient to generate circular polarization over a wide 3 dB axial ratio bandwidth. Three antennas with different maximum directivity are compared. It is shown that the axial ratio bandwidth does not vary with the directivity peak value, thanks to the excitation of a single leaky-wave mode. The study is validated by an antenna design providing 23% bandwidth. The proposed approach is very appealing for low-directive antennas with wide 3 dB axial ratio bandwidth.