The matrix theory of non uniform waveguide structures excitation

The present paper suggests a new matrix-electrodynamics method, which is based on the selection among the direct and backward waves of a more narrow class of waves, marked in correspondence with the location of excitation sources relative to the region being considered. A non-uniform waveguide structure (WS) means any fast or slow change of the form or size of its cross section, parameters of dielectric filling, metal or dielectric ledges, probes, coupling apertures, etc. As an example, the authors consider a waveguide-microstrip junction.