A Broadband, Wide-Angle Scanning, Linear-to-Circular Polarization Converter Based on Standard Jerusalem Cross Frequency Selective Surfaces

A broadband and wide-angle scanning linear polarization (LP)-to-circular polarization (CP) converter based on a dual-layer structure is presented. The elementary cell is composed of conventional Jerusalem crosses (JCs). The design procedure is based on transmission line circuit model and on full-wave simulations. The proposed equivalent circuit has been generalized to include the oblique incidence in the model. Simulated results demonstrate a 24% axial ratio bandwidth for an incidence angle theta = +/- 50 degrees in both xz and yz planes. The proposed converter provides a unique combination of wide bandwidth, thin profile, and stable response with respect to the angle of incidence. It can be integrated into any LP antenna system to generate CP without significantly affecting the antenna performances.

Automated summary

The study presents a broadband and wide-angle scanning linear polarization to circular polarization converter based on a dual-layer structure, using conventional Jerusalem crosses as the elementary cell. The design is based on a transmission line circuit model and full-wave simulations, with a generalized equivalent circuit that includes oblique incidence. Simulated results show a 24% axial ratio bandwidth for a wide range of incidence angles in both xz and yz planes, highlighting the converter's unique combination of wide bandwidth, thin profile, and stable response to the angle of incidence. It can be integrated into any LP antenna system to generate CP without significantly affecting antenna performance.