COMPLETE EIGENVALUE ANALYSIS OF INHOMOGENEOUSLY DIELECTRIC-LOADED 2 CONDUCTOR GUIDING STRUCTURES

A complete full-wave eigenvalue analysis is presented for inhomogeneou sly filled guiding structures that support TEM mode. The analysis is b ased on treating the transverse inhomogeneity of the filling dielectri c as a polarization current that excites the corresponding empty guidi ng system. The problem is formulated to determine the quasi-TEM and hi gher order modes of the system. The mode propagation constants squared appear as eigenvalues of the problem, and the corresponding eigenvect ors represent the expansion coefficients of the field modes. The stren gth of the formulation is verified by its application to the problem o f the partially dielectric-filled parallel-plate waveguide. The result s of the analysis are compared to the exact solution and a variational solution. The quasi-TEM mode variation versus permittivity and freque ncy variation is studied. The convergence and dispersion characteristi cs of the method are presented.