Analysis of Square Coaxial Line with Anisotropic Dielectric by Finite Element Method

In the paper, the effective relative permittivity of a square coaxial line with anisotropic and isotropic dielectric layers of different heights is calculated by the use of the Galerkin formulation of the Finite Element Method (FEM). Special attention is devoted to the case when the line is half filled with dielectric. It was shown that, in this case, the effective relative permittivity is practically equal to the value obtained by a simple formula given in the paper.