What is a shielded wire?
Definition: A conductor wrapped with a conductor outside the conductor is called a shielded wire, and the wrapped conductor is called a shielding layer, which is generally a braided copper mesh or copper moor (aluminum).
The shielding layer of the shielded cable is mainly made of non-magnetic materials such as copper and aluminum, and the thickness is very thin, which is much smaller than the skin depth of the metal material at the frequency of use. The effect of the shielding layer is not mainly due to the reflection of the electric field and magnetic field by the metal body itself. , absorption, but due to the grounding of the shielding layer. Different grounding forms will directly affect the shielding effect. The grounding methods of the electric field and magnetic field shielding layers are different. Can be ungrounded, single-ended or double-ended.