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Abstract
This work presents an efficient algorithm for the analysis of a typical complete feeding system. Several different methods have been adopted, in conformance with their specific advantages, to analyze part of the structure. Mode-matching has been used to analyze the corrugated waveguide, a Generalized admittance matrix approach has been used to analyze the mode launchers and an integral equation technique was used to compute the field radiated by the feed. Comparisons are shown with results by the Finite Elements analysis (FEM).