Elements for the transmission of electrical energy

Claim 1

An element for the transmission of electrical energy in a selected high frequency range, of the kind comprising at least one conductive element of heterogeneous structure in the radial direction and composed of a metallic core and a plurality of surrounding layers, said core and said layers being in direct conductive contact with one another along their entire surface, wherein the materials forming the conductive element are so distributed in the radial direction that at least one of the parameters resistivity, permeability and permittivity of said materials thereby selected increases progressively in a radial direction from one material to the next thereby to impose on the resistance of the conductor a predetermined variation within a given range of frequencies by a modification of the radial distribution of the current density as compared with the distribution of the conventional skin effect in a sense tending to reduce the current density at the surface to the advantage of the current passing inside the conductor, the total thickness of all of the layers provided being at least substantially equal to the conventional skin effect thickness thereof at a frequency at least equal to the cutoff frequency of said element.