ANALYSIS OF MICROSTRIP DISCONTINUITIES USING THE METHOD OF INTEGRAL-EQUATIONS FOR OVERLAPPING REGIONS

The method of integral equations for overlapping regions (MIEOR) in co njunction with a planar dispersive waveguide model is proposed for the investigation of microstrip discontinuity problems. A general formula tion for a microstrip multiport junction and the numerical solution fo r the scattering matrix of T- and right-angled bend junctions with and without matching stubs are presented. The proposed technique directly leads to Fredholm's integral equation of the second kind or a coupled set of integral equations for the electric field components defined i n overlapping subregions of the planar dispersive waveguide model. The Galerkin's method is employed to find the unknown coefficients in the electric field series expansion which represent the S-parameters of t he junctions. The mathematical substantiation of the algorithm is prov ided. Numerical results are presented for T- and right-angled microstr ip junctions showing good agreement with results already published.