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A new bandstop filter design is proposed using evanescent mode cavities consisting of short-circuited lengths of cylindrical waveguide operated below cutoff frequency. The proposed bandstop filter shows a very high Q bandstop response at lower frequencies, unavailable with a lumped element approach, and with smaller physical size than can be achieved with coaxial structures.
Microwave Symposium Digest, 2003 IEEE MTT-S International (Volume:2 )
Date of Conference: 8-13 June 2003