Accurate Design of Coaxial Cavity Resonator Filters

Quarter wavelength coaxial line cavities are commonly used structures in constructing diplexer and band pass filters at the Very and Ultra High Frequencies (V-UHF). Despite its wide use of this structure, design rules of selecting geometrical details concerning the input/output feeding points are de...

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Bibliographic Details
Published in:Journal of electromagnetic waves and applications 2004-01, Vol.18 (8), p.1119-1131
Main Authors: Michail, G. Ch, Uzunoglu, N. K.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
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Summary:Quarter wavelength coaxial line cavities are commonly used structures in constructing diplexer and band pass filters at the Very and Ultra High Frequencies (V-UHF). Despite its wide use of this structure, design rules of selecting geometrical details concerning the input/output feeding points are determined in each case experimentally, which is a tiresome process. In order to achieve an accurate and reliable design and to avoid cut and paste to achieve fine tuning of resonance at the desired frequency and matching at the input/output lines a field analysis is implemented to develop accurate design rules. In this context the effect of feeding structure geometrical details as well as inner-outer conductor gaps are examined. Furthermore, in order to achieve an additional control of the filter bandwidth the use of a tapered coaxial line is also examined and computed. The performance of various structures is examined and design curves are provided to ease the work of designer.
ISSN:0920-5071
1569-3937
DOI:10.1163/1569393042955388