ACCURATE ANALYSIS OF SCATTERING FROM MULTIPLE WAVE-GUIDE DISCONTINUITIES USING THE COUPLED-INTEGRAL EQUATIONS TECHNIQUE

A Coupled-Integral-Equations Technique (CIET) for the analysis of mult iple discontinuities and bifurcations in rectangular waveguides is pre sented. A set of coupled integral equations for the tangential electri c field over the planes of the discontinuities are derived and then so lved by the moment method. Basis functions, which include the edge con ditions and mirror images in the walls of the waveguide, are used to a ccelerate convergence of the numerical solution. One or two basis func tions are sufficient to accurately determine the reflection and transm ission properties of H-plane discontinuities and bifurcations. Reflect ion and transmission properties of N discontinuities are computed accu rately from a single matrix of the order of 3N x 3N instead of cascadi ng the individual generalized scattering matrices whose dimensions inc rease rapidly as the distances between the discontinuities decrease.