Direct numerical PO design of improved dual-offset reflector antennas

An efficient direct numerical synthesis method for dual offset reflector antennas is described which is based on the physical optics (PO) procedure. The method involves an evolution strategy optimization algorithm in order to shape both reflectors directly so as to generate the desired far field with prescribed criteria. The efficiency of the design method is demonstrated with reference to the example of compact Gregorian dual offset earth station antennas with high offset angle and small reflector size. High antenna efficiency, low cross-polarization attenuation, and a very low sidelobe behavior were achieved.<>