The present invention advantageously provides a cost effective flat rotor for a pancake type slip ring. A flat copper coil sheet is stamped into a corrugated shape having concentric V-ring grooves. The corrugated stamped copper foil sheet is bonded using a bonding agent to a dielectric layer. Multiple concentric V-grooves are formed by separating the grooves, for example, by machining the grooves at an apex thereof in order to form separate electrical circuits. A corresponding plurality of holes extend through each concentric ring and through the dielectric layer from the first side through the second side. A conductive material is placed in each of the plurality of holes to electrically connect each concentric ring to the second side.