Multibeam Compact Dual Reflectarray Antenna for High-Throughput Satellites in Ka-Band

This contribution describes the design of a dual-reflector multibeam antenna based on a parabolic polarizing main reflector with a flat reflectarray subreflector. This antenna concept is proposed to produce multiple beams in orthogonal CP for enabling broadband satellite communications in Ka-band. The antenna generates two orthogonal beams per feed at transmit (19.7 GHz) and receive (29.5 GHz) frequencies in Ka-band, which would make it possible to reduce by half the number of conventional reflector antennas required onboard the satellite to produce the same multispot coverage. The antenna generates a set of high-gain circularly polarized beams when illuminated by dual-linearly polarized feed-horns, which avoids the use of linear-to-circular polarizers in the feed-chains.