Dielectric Coated Wires

The effect of dielectric-coated wires can be modelled using an equivalent impedance or as an equivalent volume current.

Feko implements two methods for modelling dielectric and magnetic coatings on wires:

• Popovic’s formulation modifies the radius of the metallic wire core to change the capacitive loading on the wire, while simultaneously adding a corresponding inductive load. The method requires that the loss tangent of the layer be identical to the loss tangent of the surrounding medium.
• Pure dielectric layers (for example, the relative permeability of the layer equal to the surrounding medium) should be modelled with the equivalence theorem where the effect of the dielectric layering is accounted for by a volume polarisation current.
  Note: Layers must be non-magnetic.