▎ 摘　　要

NOVELTY - Graphene/metal composite conductor comprises metal conductor having two sides arranged oppositely, and two side graphene layers. Each of the lateral graphene layers is grown in situ on one of the lateral faces of the metal conductor. The thickness of each side graphene layer is 0.5-8 mu m. The width of each side graphene layer is 0.3-10 nm. USE - The conductor is useful as conductor material of transmission line. ADVANTAGE - The conductor: realizes adjustable impedance range of 30-80 Omega when in use, and dynamic adjustment of impedance matching with the device or system. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing graphene/metal composite conductor; and (2) transmission line.