| 摘要 |
A cable (10) comprises a plurality of mutually insulated conductor (12, 14, 16, 18, 20) and a resistive layer (28) surrounding, and being insulated from, the conductors to prevent radio frequency transmission therefrom. The bulk resistance of material comprising the resistive layer is greater than that of the material comprising the conductors. The thickness of the resistive layer may be greater than the skin depth &dgr; the skin depth &dgr; being equal to where σ is the conductivity of the material, f is the frequency, µ r is the magnetic permeability relative to that of free space, and µ o is the magnetic permeability of free space. The thickness is typically between 2 and 10 times the skin depth.
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