Quasi-static analysis of the square coaxial cable with Tellegen bi-isotropic material

The paper presents the calculation of the effective relative permittivity of the square coaxial cable with bi-isotropic Tellegen material by using the Galerkin variant of the Finite Element Method (FEM). Weak basis functions of the third order and the rectangular 2D mesh were applied. Calculation was performed for different heights of the dielectric layer. Special attention was given to the case when the cable is half-filled with dielectric. It was shown that the results for the effective relative permittivity can be approximated by a simple formula similar to the one previously reported.