Title :
Fast algorithm for the characterization of ridged waveguide discontinuities
Author :
Najid, Abdellah ; Baudrand, Henri ; Crampagne, Raymond ; Diez, Hubert
Author_Institution :
Lab. d´´Electron., ENSEEIHT, Toulouse, France
Abstract :
Ridged circular waveguide discontinuities are used in many applications such as polarizers and filters. This paper presents a fast algorithm for their characterization. The method is based on integral equation with a scalar Green´s function for the calculation of mode spectrum of ridged circular waveguide, in combination with an improved variational multimodal formulation for the characterization of the step discontinuity. The coupling coefficients are evaluated by post-processing of the matrices already used in the mode determination. The overall scattering matrix is obtained by cascading an impedance matrix of each discontinuity. The salient features of this algorithm are its speed and its simplicity. It consumes less memory and CPU time. The numerical results are verified by excellent agreement with measurements
Keywords :
Green´s function methods; S-matrix theory; circular waveguides; integral equations; microwave filters; ridge waveguides; variational techniques; waveguide discontinuities; circular waveguide; coupling coefficients; filters; integral equation; mode determination; mode spectrum; overall scattering matrix; polarizers; post-processing; ridged waveguide; scalar Green´s function; step discontinuity; variational multimodal formulation; waveguide discontinuities; Admittance; Apertures; Eigenvalues and eigenfunctions; Impedance; Integral equations; Scattering; Transmission line matrix methods; Waveguide discontinuities; Waveguide junctions; Waveguide transitions;
Conference_Titel :
Microwave and Optoelectronics Conference, 1997. Linking to the Next Century. Proceedings., 1997 SBMO/IEEE MTT-S International
Conference_Location :
Natal
Print_ISBN :
0-7803-4165-1
DOI :
10.1109/SBMOMO.1997.648807
