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Uniaxial discontinuities analysis by a new multimodal variational method—application to filter design
Author(s) -
LilongaBoyenga Désiré,
Tao Junwu,
Vuong Tân Hoa
Publication year - 2007
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.20200
Subject(s) - classification of discontinuities , discontinuity (linguistics) , admittance , operator (biology) , microwave , band pass filter , convergence (economics) , modal , admittance parameters , filter (signal processing) , modal analysis , mathematical analysis , mathematics , acoustics , electronic engineering , computer science , topology (electrical circuits) , physics , engineering , structural engineering , electrical impedance , finite element method , materials science , telecommunications , electrical engineering , repressor , chemistry , biochemistry , transcription factor , polymer chemistry , economics , gene , voltage , economic growth
Abstract A new mulitimodal varational formulation (NMVF) is presented for the characterization of cascaded discontinuities in microwave components by using a formal admittance operator of the complete structure. The admittance operator is constructed by using all higher‐order modes in intermediate waveguides, so that the convergence study versus the number of modes will no longer be needed, contrary to classical modal decomposition methods. This formulation will theoretically lead to increased accuracy for the overall S parameters. To validate this new approach, a step‐discontinuity is analyzed and an evanescent mode bandpass filter is designed. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE 2007.