A GENERAL-METHOD OF CONSTRUCTION FOR DYADIC GREEN-FUNCTIONS OF PLANE-STRATIFIED MEDIA IN UNIFORM OPEN OR CLOSED WAVE-GUIDES WITH SEPARABLE CROSS-SECTIONS

A general method of construction for dyadic Green functions is describ ed by means of E-mode and H-mode decomposition for a planar multilayer ed medium with open or closed uniform waveguide cross section in which modal expansion is possible. Analysis by the equivalent transmission line model in the propagation axis direction, as used in the construct ion of the dyadic Green function in the plane wave spectral representa tion by Barkeshli and Pathak, is applied to the general construction o f dyadic Green function via the E-mode and H-mode decompositions by Fe lsen and Marcuvitz, so that a dyadic Green function with a compact alg ebraic representation is obtained. When the plane wave spectral functi on is chosen as the mode function in the cross section in the present construction method, the results of Barkeshli and Pathak are completel y reproduced. The case in which the rectangular and circular waveguide mode functions are chosen as the cross-sectional mode function is dis cussed. Furthermore, the high frequency is applied to the dyadic Green function for an infinite planar layered medium. It is shown that the electromagnetic wave propagation in the medium can be described by fou r vector rays. (C) 1998 Scripta Technica.