Full-wave boundary contour mode-matching analysis and CAD of cavities with partial height post and rounded corners for sophisticated conductor loaded cavity and combline filter designs

Abstract

The boundary contour mode-matching method (BCMM) is extended to provide the rigorous analysis of cavity T-junctions with interior partial height post and rounded corners. It allows the full-wave CAD of complete combline resonator and conductor loaded TE/sub 101/ mode cavity filter configurations with the suitable implementation of cross couplings for the realisation of arbitrary filter functions. Thus, the approach accounts for the consideration of the particular rounded shapes when using the state-of-the-art CNC milling techniques for the realization of the component. Verification of the method is provided by several designs as, e.g., a single T-junction cavity, a 10resonator combline filter and a 3-pole conductor loaded cavity. Accurate coincidence of computed and measured results of these designs proves the introduced approach.