Flexible cable and transmission system

摘要

A flexible cable is provided in which a transmission characteristic can be ensured in a high frequency band, and electromagnetic noises can be suppressed. A flexible cable 11 includes a sheet-like base member (dielectric substance) 1; an adhesive (dielectric substance) 2 which bonds the base member 1 to a cover member (dielectric substance) 3; a shield member 4 which covers the cover member 3 and is bonded or printed to the cover member 3 to suppress electromagnetic noises to be radiated; and a top coating member 5 which covers the shield member 4 to protect the shield member 4. The flexible cable 11 has a differential signal wire group 7 including differential signal wires 6 through which differential signals pass and guard ground wires 9a which prevent the interference from other differential signals; a low-speed signal wire 8 through which a low-speed signal passes; a ground wire 9 used as a ground; and a shield ground wire 10 which is adapted to allow the electric potential of the shield member 4 to be identical to the electric potential of the ground, all of which are provided in the adhesive 2. The differential signal wires 6 are not covered with the shield member 4.