ANALYSIS OF A MICROSTRIP CROSSOVER EMBEDDED IN A MULTILAYERED ANISOTROPIC AND LOSSY MEDIA

The equivalent circuit and the scattering parameters of the orthogonal microstrip crossover discontinuity are determined by assuming that th e conducting strips are embedded in a multilayered substrate which may contain both anisotropic dielectrics and materials with a nonnegligib le conductivity. The equivalent circuit of the crossover is obtained i n terms of the complex excess charge densities on the strips. These ex cess charge densities are computed by means of the Galerkin method in the spectral domain. Comparison is carried out with previously existin g results for microstrip crossovers on lossless isotropic substrates a nd original results are presented for crossovers on anisotropic and lo ssy substrates.