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The coaxial cable is divided into four layers from the inside to the outside: a central copper wire (single-stranded solid wire or multiple stranded wires), a plastic insulator, a mesh-shaped conductive layer, and a wire center wire and a mesh-shaped conductive layer to establish a current loop. The center copper wire and the mesh conductive layer are known for their coaxial relationship.
RF Coaxial cable transmission of AC power is not DC, in other words, there will be several times of current reversal every second.
If a normal wire is used to transmit a high frequency current, the wire will be equal to an antenna that emits the radio outward. This effect depletes the power of the signal and reduces the received signal strength.
The design concept of the coaxial cable is to deal with this problem. The radio emitted by the center wire is isolated by a mesh-shaped conductive layer that can be manipulated by ground to transmit the emitted radio.
Coaxial cable assembly also has a problem, that is, if a certain section of the cable produces a large extrusion or distortion, the distance between the center wire and the mesh conductive layer is not consistent, which leads to the internal Radio waves are reflected back to the signal source. This type of effect reduces the signal power that can be received. To overcome this problem, a layer of plastic insulator is added between the center wire and the mesh conductive layer to ensure that the spacing between them is consistent. This also causes the characteristics of such cables to be stiff and not easy to bend.