A Low-Profile Circularly Polarized Beam Steering Folded Reflectarray

This article introduces a low-profile circularly polarized beam-scanning folded reflectarray. The proposed antenna consists of a circular polarization selection surface (CPSS), a reflectarray and a circularly polarized horn. The CPSS reflects right hand circular polarization (RHCP) waves and transmits left hand circular polarization (LHCP) waves, while the reflectarray realizes polarization conversion. The rotation of the upper CPSS and lower reflectarray enables beam steering in both elevation and azimuth angles. The proposed circularly polarized beam-scanning folded reflectarray exhibits a maximum elevation scanning angle of 43° with good circularly polarized radiation performance.