Investigation of antenna elements and arrays as feed for offset reflector antenna

Abstract

Offset reflector antennas ORA are popular due to their low aperture blockage and good isolation between the feed and the reflector However the asymmetry in ORA geometry also leads to depolarization of the waves incident on the reflector thereby generating high cross polarization in the asymmetric plane of the reflector Such high cross polar levels can be reduced by conjugate field matching CFM technique In this technique an asymmetric higher order mode similar to the asymmetric focal p...