User Defined Surface Impedance

This option allows the definition of a complex user defined surface impedance, Zs.



Figure 1. The SK - Add a skin effect (finite conductivity) dialog.
Note: The surface impedance (real and imaginary parts) are defined with the DI card. The SK card then uses the label defined at the DI card.

Parameters:

Material label
Label of the material which will be used as the defined surface impedance (as specified in the DI card).

For example, to model a solid dielectric object with relative permittivity ε r and with conductivity σ at a specific angular frequency ω=2πf the following surface impedance expression can be used:

(1) Z s = μ 0 ϵ 0 ε r j σ ω

The user defined complex surface impedance Zs relates to the surface current Js and the E-field by E tan = Z s J s where E tan is the tangential E-field and J s is the surface current density.