Abstract: A cylindrically shaped backplane contains conductors that provide circular buses that connect corresponding contacts of connectors mounted to the backplane. When circuit cards are inserted into the connectors, the circuit cards extend radially from the cylindrical backplane.

Abstract: A laminated cylindrical backplane is constructed using disks with a conductive material mounted on a top surface, and a conductive material mounted on a second surface. Each disk and its conductive surfaces are separated from adjacent disks and their conductive surfaces by a dielectric material. The laminated structure forms a cylindrical backplane where circuit cards are radially mounted to the backplane by inserting the cards into slots in the perimeter of the cylindrical structure. The slots contain contacts where similarly positioned contacts of a particular disk are electrically connected to form a bus structure. As a result, similarly positioned conductive surfaces on circuit cards are electrically connected when the cards are inserted into the slots.