Coaxial Ridged Evanescent-Mode Filter

Wide band waveguide band-pass filters based on sections of ridged waveguide separated by evanescent-mode propagation gaps and coupled with coaxial SMA connectors by side loops.

Design Method
Design method is based on solving of electromagnetic scattering problem of junctions of double ridged waveguide. Semi-numerical solution is derived for several types of junctions loaded with iris elements. The obtained formulation is represented as fortran code and compiled into design tool. The design tool consists of four program modules; filter synthesizer, frequency response simulator, and optimizer and HFSS/AutoCAD converter. Accuracy of software is within manufacturing and tuning margins.

Frequency response; (1) 10 - 15 GHz frequency range, (2) In-band insertion loss, (3) Broad-band frequency sweep,