A Simple Method to Design Ridge Waveguide Filters with Evanescent Mode Couplings

Ozturk O. O., YILDIRIM N.

24th International Microwave and Radar Conference, MIKON 2022, Gdansk, Poland, 12 - 14 September 2022 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Gdansk
  • Country: Poland
  • Keywords: evanescent couplings, evanescent waveguide, inverter couplings, microwave filters, ridge waveguide
  • Middle East Technical University Affiliated: Yes


© 2022 Warsaw University of Technology.A simple approach is introduced to design ridge waveguide (RWG) filters with evanescent waveguide (EWG) couplings based on the observation that when all inverters and all resonators of an inverter coupled filter are replaced by equal length EWG pieces and equal length RWG pieces respectively, all responses are destroyed (bandwidth changes, passband shifts away and passband ripple increases) but the number of reflection zeros are preserved. It is noticed that the targeted responses of this highly distorted filter can be recovered simply by tuning lengths of EWG and RWG pieces in a systematic manner. Two examples are presented.