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Two‐zero four‐pole building block for microwave waveguide filters using all‐resonant modes at their cutoff frequency
Author(s) -
Boutheiller Nicolas,
Jarry Pierre,
Kerhervé Eric,
Pham JeanMarie,
Vigneron Serge
Publication year - 2003
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.10103
Subject(s) - cutoff , microwave , cutoff frequency , classification of discontinuities , cascade , block (permutation group theory) , waveguide , coupling (piping) , physics , dual mode , mode (computer interface) , acoustics , topology (electrical circuits) , electronic engineering , engineering , optics , mathematics , computer science , mathematical analysis , electrical engineering , geometry , quantum mechanics , mechanical engineering , operating system , chemical engineering
This article describes a basic building block for microwave waveguide filters. It uses a new coupling scheme where all resonant modes are used at their cutoff frequency. It is composed of a cascade of basic nonloaded rectangular cavities where the modes are alternately single mode and dual mode. These cavities are coupled directly, without any iris. Neither coupling nor tuning screws are needed. The analysis of the discontinuities is performed by the method of moments (MoM). The synthesis makes use of an optimization method based on the genetic algorithm. Prototypes have been realized and measurements are shown to confirm the analysis results. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 429–437, 2003.