Evanescent Mode-Serrated Ridge Waveguide Bandpass Harmonic Filters

Abstract

A new class of bandpass harmonic filters with spurious free and extremely wide stopband response is presented. The design concept is based on using evanescent mode waveguide sections as impedance K-inverter, while using serrated ridge waveguide sections as series resonators. Measured results of narrow and wideband filters show an excellent agreement with the theoretical design.