DocumentCode :
1086318
Title :
A wideband waveguide transition design with modified dielectric transformer using edge-based tetrahedral finite-element analysis
Author :
Wu, Ruey-Beei
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Volume :
44
Issue :
7
fYear :
1996
fDate :
7/1/1996 12:00:00 AM
Firstpage :
1024
Lastpage :
1031
Abstract :
A waveguide transition analysis approach has been established to deal with arbitrary shaped three-dimensional (3-D) waveguide discontinuity problems, by hybridizing the edge-based tetrahedral finite-element method for the junction region and the analytic modal expansion technique for the waveguide region. Several unique features have been imbedded in the analysis, including a variational formula for the scattering coefficients, a modified Delaunay triangulation for the mesh generation, and a frontal solution technique for the sparse matrix solution. As a result, the analysis is verified to be accurate, versatile, and efficient through extensive comparisons with the theoretical and measurement data in the available literature. The approach is then applied to design a rectangular to dielectric-filled circular waveguide transition with less than -20 dB return loss over a 40% bandwidth by using a suitable modified dielectric rod transformer
Keywords :
circular waveguides; dielectric-loaded waveguides; mesh generation; sparse matrices; waveguide discontinuities; waveguide theory; 3D waveguide discontinuity; analytic modal expansion technique; dielectric rod transformer; dielectric-filled circular waveguide; edge-based tetrahedral FEA; finite-element analysis; frontal solution technique; mesh generation; modified Delaunay triangulation; modified dielectric transformer; rectangular to circular waveguide transition; scattering coefficients; sparse matrix solution; variational formula; wideband waveguide transition design; Dielectric losses; Finite element methods; Hybrid junctions; Mesh generation; Scattering; Sparse matrices; Waveguide discontinuities; Waveguide junctions; Waveguide transitions; Wideband;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/22.508634
Filename :
508634
Link To Document :
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