Design and analysis of multiple-beam reflector antennas

Simplified design and analysis equations are presented for multiple-beam re flector antennas based on the Gaussian-beam analysis of the primary and sec ondary patterns. The derived equations are useful for the quick design and performance analysis in terms of the coverage-area directivity and the inte r-beam isolation of multiple-beam antenna systems. Results of the analysis given in this paper agree well with rigorous computations based on physical -optics analysis of the reflector-antenna radiation patterns. Extension of the analysis to multiple-beam lens antennas, and to shaped/contoured-beam a ntennas, is also presented.