Microwave Bandpass Filters Using Re-Entrant Resonators

Design techniques for microwave bandpass filters using re-entrant resonators are presented. The key feature is that each re-entrant resonator in the filter generates a passband resonance and a finite frequency transmission zero above the passband. Thus, an N th degree filter can have N finite freque...

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Bibliographic Details
Published inIEEE transactions on microwave theory and techniques Vol. 63; no. 3; pp. 954 - 964
Main Authors Musonda, Evaristo, Hunter, Ian C.
Format Journal Article
LanguageEnglish
Published IEEE 01.03.2015
Subjects
Admittance
Equivalent circuits
Filtering theory
Inline
Passband
Ports (Computers)
Power transmission lines
pseudoelliptic filters
re-entrant resonator
Resonant frequency
transmission zeros
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Summary:Design techniques for microwave bandpass filters using re-entrant resonators are presented. The key feature is that each re-entrant resonator in the filter generates a passband resonance and a finite frequency transmission zero above the passband. Thus, an N th degree filter can have N finite frequency transmission zeros with a simple physical realization. A physically symmetrical five-pole re-entrant bandpass filter prototype with five transmission zeros above the passband was designed and fabricated. Measured results showed good correspondence with theories.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2015.2389216