Mode matching analysis of arrays of stepped rectangular horns and application to satellite antenna design

Satellite antennas commonly use reflectors with array feeds. In such cases the efficient illumination of the reflector is crucial in the design of the arrays. Methods in use to improve the illumination efficiency of the array include partially loading the horns with dielectric, or employing multi-mode horns. The author describes the analysis of an array of multimode stepped rectangular horns, including the effect of mutual coupling, using the mode matching method. It has already been used in a study of the Hughes Aircraft Company´s HS601C satellite Ku-band antennas and some results obtained are outlined herein