Coaxial cable is divided into four layers from inside to outside: central copper wire (single stranded solid wire or multi stranded wire), plastic insulator, mesh conductive layer and wire sheath. The central copper wire and the network conductive layer form a current loop. Because the central copper wire and the mesh conductive layer are coaxial.
Coaxial cables carry alternating current rather than direct current, that is, there is a reversal of the current direction several times per second.
If a high frequency current is transmitted using a common wire, the wire is equivalent to an antenna that emits radio outward, which affects the power of the signal and reduces the received signal strength.
Coaxial cable is designed to solve this problem. The radio emitted by the center wire is insulated by a network of conductive layers, and the network conductor layer can control the emitted radio by grounding.
Coaxial cable is also a problem, if a cable segment is relatively large extrusion or distortion, so between the center wire mesh and the conductive layer distance is not consistent from beginning to end this causes, internal radio waves will be reflected back to the signal source. This effect reduces the received signal power. To overcome this problem, a layer of plastic insulator is added between the center wire and the mesh conductive layer to ensure that the distance between them is consistent. This also causes the cable to be stiff and not bent easily.
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