Coaxial cable conduction AC instead of DC, that is to say every second there will be several times the current direction is reversed.

If the use of general wire transmission of high frequency current, the wire will be equivalent to an emitting radio antenna, this effect is the loss of signal power, makes the received signal strength decreases.

Coaxial cable is designed to solve this problem. The center wire emitted radio be meshed conductive layer isolation, net-like conductive layer can be grounded through the way to control the emission of radio.

Coaxial cable is also a problem exists, if cable one occurred more compression or distortion, then the center wire and mesh between the conductive layer distance will not be consistent from beginning to end, it can cause internal radio wave will be reflected back to the signal source. This effect is reduced to a received signal power. In order to overcome this problem, the center wire and mesh between the conductive layer is added with a layer of plastic insulator to ensure that the distance between them be consistent from beginning to end. This also resulted in the cable more stiff and not easy to bend characteristics.