Abstract: Disclosed is a transmission cable capable of controlling and regulating its characteristic impedance and electromagnetic interference simultaneously. The transmission cable comprises at least two conduction wires, which are twisted with each other along a longitudinal direction of the transmission cable. In the design of the transmission cable, the electromagnetic interference is controlled through the twisting of the conduction wires (for example, twisted pair cable). In addition, the two conduction wires tightly contact each other without any gap therebetween, thus achieving the control of its characteristic impedance.