Improvement in calculation of some surface integrals: application to junction characterization in cavity filter design

A rigorous method which makes it possible to reduce a surface integral to a contour integral is developed. The application of this formulation to the study of a circular-to-rectangular waveguide junction reduces the time of computation of the scattering parameters by more than 50%. The method is used to calculate the electromagnetic coupling of circular cavities by a rectangular iris. This approach, together with an optimization procedure, has allowed the direct design of a filter without any further mechanical adjustments. The results obtained are in good agreement with experimental data.<<ETX>>

[1]  Gian Guido Gentili.  Properties of TE-TM mode-matching techniques , 1991 .

[2]  R. R. Bonetti,et al.  A TE triple-mode filter , 1988, 1988., IEEE MTT-S International Microwave Symposium Digest.

[3]  B. N. Das,et al.  Analysis of a transition between rectangular and circular waveguides , 1991 .

[4]  Henri Baudrand,et al.  Analyse et conception de filtre passe-bande en guide nervuré par l’approche variationnelle , 1990 .

[5]  M. S. Navarro,et al.  Propagation in a Rectangular Waveguide Periodically Loaded with Resonant Irises , 1980 .

[6]  Henri Baudrand,et al.  A new rigorous method for the determination of iris dimensions in dual-mode cavity filters , 1994 .

[7]  F. Arndt,et al.  Double-Plane Steps in Rectangular Waveguides and Their Application for Transformers, Irises, and Filters , 1982 .

[8]  D. Wolk,et al.  New possibilities of cavity-filter design by a novel TE-TM-mode iris-coupling , 1989, IEEE MTT-S International Microwave Symposium Digest.

[9]  Henri Baudrand,et al.  Multimodel variational analysis of uniaxial waveguide discontinuities , 1991 .

[10]  Wai-Cheung Tang,et al.  A True Elliptic-Function Filter Using Triple-Mode Degenerate Cavities , 1984 .

[11]  A. E. Williams.  A Four-Cavity Elliptic Waveguide Filter , 1970 .

[12]  H. Baudrand,et al.  Design of a dual dielectric rod-antenna system , 1993, IEEE Microwave and Guided Wave Letters.

[13]  Jens Bornemann,et al.  Modal S-matrix method for the optimum design of inductively direct-coupled cavity filters , 1986 .

[14]  B. N. Das,et al.  Narrow wall axial-slot-coupled T junction between rectangular and circular waveguides , 1989 .

[15]  A. Atia,et al.  Narrow-Bandpass Waveguide Filters , 1972 .