Abstract: A signal transmission cable including a conductive tape, a number of grounding conductive wires, a number of insulation wires in the first layer and a number of insulation wires in the second layer. The insulation wires in the first layer are used for transmitting a voltage signal, and the insulation wires in the second layer are used for transmitting a power set. The insulation wires in the first layer are paired and arranged on the conductive tape at an equal distance. The grounding conductive wires are embedded between the signal wire pairs for stabilizing the impedance. The insulation wires in the first layer and the insulation wires in the second layer are separated by a conductive tape for destructing the noise coupling effects between the layers. Lastly, the conductive tape covers the first layer and the second layer for impedance control and containing signal energy in the cable.