So a conductive shield will constrict the electric portion of the EM wave between the conductor and the shield. A high permeability shield would do the same for the magnetic portion.
If we only have one (usually the electric screen), won’t this offset the geometric proportion of the signal’s electric and magnetic components? Electric field is constricted at a radius but the magnetic field goes on freely.
The electric field drops by square of distance, and magnetic drops by cube of distance, so if both types of shielding were utilized, would it matter to have them distanced accordingly from the conductor to preserve coherence? Maybe this would not matter for an interconnect considering how very little of a magnetic field the minimal current produces, but what about a power cable?
People do often describe well-designed unshielded cables as more open sounding and this is attributed to capacitance, but is it necessarily the capacitance that is the culprit, or the spatial constriction of the electric field, capacitance being a necessary effect that follows from the distancing?