The so-called "shielding" on the cable structure is essentially a measure to improve the distribution of the electric field. A wire wrapped with a conductor outside the wire is called a shielded wire. 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 shielded cable is a transmission line that uses a metal mesh braid to wrap the signal wire, and the braid is generally red copper or tinned copper. The shielding layer of the shielded wire needs to be grounded, and external interference signals can be guided to the ground by this layer.
Shielded wire is a kind of wire with metal braided shell specially used to reduce the influence of external electromagnetic field on power supply or communication line. This shielded wire also has the effect of preventing the wire from radiating electromagnetic energy to the outside.
Function: prevent interference signals from entering the inner layer, conductor interference and reduce the loss of transmission signals.
Note: When selecting shielded wires, the insulating layer of the grounding wire of the shielding layer has a conductive function and can be connected to the shielding layer (with a certain resistance).
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.
The conductor wrapped by the structure is called the shielding layer, which is generally conductive cloth, braided copper mesh or copper (aluminum) platinum.
Ordinary cable: insulation layer + shield layer + wire.
Advanced Cable: Insulation + Shield + Signal Conductor + Shield Ground Conductor.
Application: The shielding layer needs to be grounded, and the external interference signal can be introduced into the ground by this layer, so as to avoid the interference signal entering the inner conductor and reduce the loss of the transmission signal.
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