A method of producing an antenna system having main and auxiliary reflecting surfaces.

摘要

To produce a dual reflector antenna system capable of passing radiation to or from a shaped coverage area by means of a single feed (1), a three dimensional main reflector surface (3) and a three dimensional sub-reflector surface (2), a method is employed which includes defining desired levels and/or characteristics of radiation incident upon or received from selected regions of said coverage area, and optimising actual radiation levels and/or characteristics for said regions by modifying both said reflector surfaces (2,3) simultaneously. The optimisation is achieved by iteratively determining levels and/or characteristics of radiation incident upon or received from each of said regions and obtaining the least favourable value of level and/or characteristic and modifying said reflector surfaces (2,3) simultaneously to obtain an improved least favourable value of level and/or characteristic.