New to the forum! I am designing a 50 ohm microstrip line for a sintered signal line of heterogeneous material. All the equations for characteristic impedance I am seeing are functions of the geometry and dielectric. This conductor has a conductivity ~20% of silver with a bottom plane of copper. Can I disregard these differences and choose my dimensions from the many online calculators? Or are those all assuming homogeneous copper conductors? Any help is much appreciated!