Author :
Helszajn, J. ; Pereda, J.A. ; Casanueva, A. ; Mediavilla, A. ; McKay, M. ; Caplin, M.
Author_Institution :
Dept. of Comput. & Electr. Eng., Heriot-Watt Univ., Edinburgh, UK
Abstract :
The discontinuity effect at a step between any two waveguides is an important aspect in the design of impedance steps and filter structures. The purpose of the paper is to characterise the effect between a regular rectangular waveguide and a triple ridge waveguide propagating its dominant mode. One method of achieving this is to employ a 180° UE (unit element) in conjunction with a calculation of the characteristic impedance and wavelength of the ridge waveguide. Another method is to have recourse to its odd-mode eigen-network. Both procedures are employed in order to obtain data on such a discontinuity. Results are in accord with separate calculations using a commercial finite element (FE) solver
Keywords :
eigenvalues and eigenfunctions <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; electric impedance <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; equivalent circuits <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; finite element analysis <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; rectangular waveguides <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; ridge waveguides <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; waveguide discontinuities <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; waveguide theory <discontinuity effects, triple ridge waveguides, 90°/180° unit elements, charactn.>; characteristic impedance; characteristic wavelength; discontinuity effects; eigenvalue; equivalent circuit; filter structures; finite element analysis; impedance steps; odd-mode eigen-network; rectangular waveguide; triple ridge waveguides; unit elements; waveguide discontinuities;
