Rigorous evaluation of propagation losses in arbitrarily shaped waveguide structures using boundary integral - resonant mode expansion and perturbation of boundary conditions

Stephan Marini, Pablo Soto, Michael Mattes, Benito Gimeno, Sergio Bleda, Ana Vidal, Vicente E. Boria

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The accurate consideration of propagation losses in arbitrarily shaped waveguide-based structures is studied in this paper. For such a purpose, a software tool based on the perturbation of the boundary conditions on the waveguide metallic walls and on the boundary integral - resonant mode expansion method has been developed. To show the advantages of the proposed technique with respect to the classic power-loss method, the complex propagation wavenumbers of a double ridge and an elliptical waveguide have been first computed and compared with results of a commercial software based on the finite element technique. Next a circular, a sectorial shaped and a triangular shaped waveguide have been considered. Then, a computer-aided design software package based on this modal analysis tool has been applied to predict the propagation loss effects in complex waveguide structures, such as an evanescent mode ridge waveguide filter, a traditional dual mode filter with circular cavities and a twist component for K-band applications.

Original languageEnglish
JournalIET Microwaves, Antennas and Propagation
Volume8
Issue number12
Pages (from-to)980-989
Number of pages10
ISSN1751-8725
DOIs
Publication statusPublished - 16 Sep 2014
Externally publishedYes

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