A shielded cable is one or more insulated conductors of a cable surrounded by a common conductive layer. The shield may consist of braided strand copper (or other metal, such as aluminum), non-woven spiral winding copper tape, or a layer of conductive polymer. Generally, the protective cover is covered with a jacket.
The shielding layer is used as Faraday cage to reduce the impact of electrical noise on the signal and reduce the electromagnetic radiation that may interfere with other equipment. The shielding layer can minimize the capacitive coupling noise from other power sources. Shielding must be grounded to be effective. The shielding layer shall be electrically continuous to function to a certain extent, including cable joints.
In the shielded signal cable, the shielding layer can act as the return path of the signal or only as the shielding layer.
High voltage power cables with solid insulation are shielded to protect cable insulation, personnel and equipment.
Coaxial cable is a kind of shielded transmission line.
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