Alternative formulations of electric dyadic green's functions of the first and second kinds for an infinite rectangular waveguide with a load

Abstract

Alternative expressions of the dyadic Green's function for an infinite rectangular waveguide with and without a load are presented for defining the electromagnetic fields due to a microstrip patch, a slot, and an equivalent magnetic surface source placed along the broad and narrow walls. The alternative formulations of the dyadic Green's functions are given in terms of rectangular vector eigenfunctions defined by using the piloting vector y and z instead of the conventional z. The sign change in the z direction involved in the double numerical integration influences the accuracy and stability of the numerical computation. The alternative forms of the dyadic Green's functions can be used to overcome this problem in the practical applications.