A simplification in the analysis of four- and five-horn fed Cassegrainian reflectors when the horns have nearly symmetric patterns

Analysis of the boresight sum gain and difference slope of a four- or five-horn fed Cassegrainian reflector is shown to be greatly simplified when the horns have circularly symmetric patterns. For a five-horn array of diagonal horns, closed-form approximate results are shown to be in very good agreement with experimental data.