Negative coupling between TE/sub 10/ and TE/sub 20/ modes for use in evanescent-mode bandpass filters and their field-theoretic CAD

摘要

A new type of evanescent-mode bandpass filter is proposed, which consists of both main and subsidiary cavities operating in two nondegenerate modes and a dominant mode, respectively. These cavities are arranged to realize a high-performance bandpass filter of small size, by applying a field-theoretic CAD. Experiments prove our approach.