INPUT IMPEDANCE OF A PROBE-EXCITED SEMIINFINITE RECTANGULAR WAVE-GUIDE WITH ARBITRARY MULTILAYERED LOADS .1. DYADIC GREENS-FUNCTIONS

Part I of this paper presents both the electric and the magnetic types of dyadic Green's functions defined for electromagnetic fields due to electric and magnetic current sources in a semi-infinite rectangular waveguide filled with arbitrary multilayered media. Applying the princ iple of scattering superposition, the dyadic Green's functions in each of the multiple loads are constructed in general for such EM current sources located in an arbitrary layer of the waveguide. Analytical exp ressions of the scattering dyadic Green's functions' coefficients are obtained in terms of transmission matrices. To demonstrate how the met hod presented is used and how the results are obtained for some specia l cases, a semi-infinite rectangular waveguide with one load is consid ered. The dyadic Green's functions and their coefficients in such a ca se are derived in closed form by reducing the general formulae of the dyadic Green's functions for the arbitrary multiple case to those for the special case concerned, Further comparison of the dyadic Green's f unctions obtained here with previous publications shows good agreement , demonstrating the applicability of the results presented here. Part II of this paper will present a full-wave numerical analysis of a prob e with both electric and magnetic current distributions.