Calculation of capacitance of rectangular coaxial line with offset inner conductor by using weak FEM formulation

In this paper, capacitance per unit length of rectangular coaxial transmission lines with offset inner conductor, having an isotropic and anisotropic dielectric, using weak, non node-based, third-order FEM formulation, is calculated. The results were compared with the results obtained by the commercial software FEMM, which uses node-based first-order basis functions. Based on that, appropriate conclusions are made.