A cable ribbon includes a first and second twinaxial cables and an outer layer surrounding the first and second twinaxial cables. The first twinaxial cable includes two first wires that are parallel or substantially parallel to each other along a longitudinal axis of the twinaxial cable ribbon, a first insulator surrounding each of the two first wires along the longitudinal axis, and a first conductive shield surrounding the first insulator along the longitudinal axis. The second twinaxial cable includes two second wires that are parallel or substantially parallel to each other along the longitudinal axis, a second insulator surrounding each of the two second wires along the longitudinal axis, and a second conductive shield surrounding the second insulator along the longitudinal axis. The first and second conductive shields are in direct contact with each other.