Shows geometry and analysis mesh of twisted pair with shield.

 

Two insulated 18 gauge wires, with filler shield spacer.

Shows the electric field potential of the twisted pair.

Note how the E-field extends out past the insulation, so that anything conductive in the crease of the two wires would tend to short out the E-field.
Shield is grounded.

Shows the magnetic field density of the twisted pair at 60 Hz.

 

Note the magnetic flux penetrates the shield conductor, and maximum density is in between the two wires.

Shows the current density of the twisted pair at 60 Hz.

 

Note that there is no sign of the skin effect for this size wire at 60 Hz.   Current density is even throughout the wire, within approx. 5%.

For the simulations at 20 kHz, see next page>

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