Diffraction by a thick diaphragm in parallel-plate waveguide

In this paper we discuss the problem of electromagnetic wave diffraction by a thick inhomogeneous diaphragm in a parallel-plate waveguide. The approach is based on the analytical method of boundary singular integral equations. Similar problems are frequently encountered in the computer-aided design of waveguide circuits. They are normally reduced to the matrix equations by the mode-matching approach. To obtain a stable and accurate algorithm, analytical semi-inversion has been used previously. Unlike this, we develop a discrete mathematical model and numerical algorithm by using the technique proposed by Lipanov (1996)