Multilayer conductor having low resistance at high frequencies

A solid conductor may be considered as formed from a series of thin conducting nesting shells. The inductance of these shells will increase with the distance from the outside. If the shells were formed from thin helically laid tapes their inductance could be adjusted by choice of the lay angles of the tapes. By this means it is possible to design a composite conductor in which all shells have the same inductance, the tape lay length decreasing from inside to outside of the conductor. Theoretical curves are given, and compared with measured data obtained on experimental cable samples. At 300 and 1000 kc/s the measured attenuations of these cables were about 70% of those of the normal solid conductor cables of equivalent cross section.