CAD technique for designing H-plane waveguide filters considering rounded corners

A Computer-Aided Design (CAD) tool based on an Aggressive Space Mapping (ASM) design strategy has been implemented for designing H-plane direct-coupled-cavity waveguide filters considering rounded corners. These corners are typically present in the windows or in the cavities of filters with coupled cavities due to defects in the most common manufacturing processes. In the ASM strategy, a very efficient tool for analysing filters with perfectly square corners has been used in the coarse model. For the fine model, here we propose an accelerated analysis technique for the efficient analysis of filters with rounded corners, using a combination of Mode-Matching (MM) and Method of Moments (MoM). It is shown how this new CAD tool reduces by 99 % the computational cost compared to other works in the literature.