The complete set of dyadic Green's functions for the parallel-plate chirowaveguide and the application to the coaxial-probe excitation method

In this paper, the complete set of four spatial-domain electromagnetic dyad ic Green's functions are rigorously derived for the parallel-plate chirowav eguide. These dyadic Green's functions are presented in the cylindrical coo rdinates, which are found to facilitate numerical calculations. An electric -field integral equation for the coaxial-probe excitation problem is formul ated using the dyadic Green's functions, and the moment-method solution is sought. The probe admittance and current distribution along the probe at di fferent chiral levels are obtained. Results show that a substantially highe r admittance level is obtained, but the admittance bandwidth decreases with the chiral parameter. Stopbands at which no net power input into the waveg uide are observed. This characteristic is found to have no match in the non chiral waveguide. The computed current distribution along the probe shows a greater current magnitude than that of the nonchiral waveguide, The validi ty of the numerical solution is checked with the measured values for the no nchiral case.