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Fast and accurate design methods for complex waveguide feed systems

This paper presents the individual design steps for the fast and accurate design of complex waveguide feed system components. Rather than using general electromagnetic codes for the analysis, targeted mode-matching routines are employed which are flexible enough to allow an attached optimization algorithm to vary individual parameters within a wide range. The so-obtained design dimensions can be verified or fine-optimized for manufacturing tolerances. The advantages of using mode-matching-based algorithms are discussed, and the design engineer is provided with some optimization guidelines. Typical results of the software packages are presented in form of three design examples involving a circular septum polarizer feed, a diplexer configuration and an entire Ku-band feed system.