Free space dyadic Green's function applied to the full-wave numerical analysis of planar transmission lines and dielectric waveguides

A method of simulation for a wide range of planar microwave transmission lines and optical waveguides is developed. It is based on the electric field integral equation using a free space dyadic Green's function and solved by the method of moments. The method is applicable to any waveguiding structure that can be represented by a set of rectangular dielectric, metal and superconducting regions with a phase velocity of a mode less than the velocity of light in a vacuum. It allows the mode propagation constant to be found and the field distributions both in dielectric and conducting regions. Results of calculations for rectangular dielectric waveguide and parallel plate line demonstrate good agreement with data obtained by other methods. Results of a simulation of microstrip lines with combined metal and superconducting layers are also presented.