Rigorous design of evanescent-mode E-plane finned waveguide bandpass filters

The authors present a new design of compact, low-cost, and low-insertion-loss evanescent-mode waveguide bandpass filters with bilateral metallic E-plane fins. Based on the modal scattering matrix method, the rigorous design takes into account the influences of both the finite fin thickness and the higher-order mode interaction at all discontinuities. Computer-optimized-design data are given for filters with passbands in the X- and the E-band with wide stopbands. The theory is verified by measurements.<>