Dyadic Green Function of an Imperfectly-Conducting Dual Waveguide Probe

Single rectangular waveguide probes are frequently employed in characterizing the permittivity of dielectric materials. A new dual rectangular waveguide probe is explored here for simultaneously extracting both permittivity and permeability of a lossy shielding material having dielectric and magnetic properties and backed by a conductor. The material characterization process is facilitated using a magnetic field integral equation formulation which is subsequently solved using the method of moments. The effects of an imperfectly-conducting backing is accommodated through the development of a dyadic Green´s function based upon an impedance boundary condition. Experimental measurements of various materials will be performed to validate the analysis.