Coaxial circuit construction and method of making

Claim 1

An electrical circuit construction providing at least one coaxial conductor comprising: a stack of at least first, second, third, fourth and fifth adjacent contacting layers, said second, third and fourth layers being disposed between said first and fifth layers with adjacent surfaces in contact and with saiD third layer in the middle, each of said first, second and third layers comprising separate portions of conductive and photo-polymer materials provided in a predetermined pattern with the outer surfaces of the conductive and photo-polymer material portions of each layer being of equal thickness and flush with one another, said second and fourth layers having predetermined patterns such that each of said second and fourth layers comprises a conductive material portion surrounding a photo-polymer material path portion following a path corresponding to a predetermined path desired for said coaxial conductor and located so as to be oppositely disposed with respect to a like photo-polymer material path portion provided for the other of said second and fourth layers, said third layer having a predetermined pattern such that said third layer comprises a conductive material portion surrounding a pair of spaced parallel photo-polymer material path portions likewise following said predetermined path and which in turn border and electrically isolate a conductive material path portion provided therebetween and constituting said coaxial conductor, said spaced photo-polymer material path portions and said conductive material path therebetween provided in said third layer being disposed and dimensioned with respect to said photo-polymer path portions of said second and fourth layers so that said conductive material path portion of said third layer constituting said coaxial conductor is in contact with and completely encircled by photo-polymer material portions of said second, third and fourth layers, and said first and fifth layers each providing conductive material overlapping said photo-polymer path portion on the respective one of said second and fourth layers to which it is adjacent and making contact with said surrounding conductive material path portion of said third layer constituting said coaxial conductor and encircling photo-polymer portions are in turn completely encircled by conductive material portions of said first, second, third, fourth and fifth layers, said stack being additionally provided with sixth, seventh, eighth and ninth adjacent contacting layers constructed and arranged in a like manner as said second, third, fourth and fifth layers, respectively, and having predetermined patterns forming a second coaxial conductor in said seventh layer following a desired predetermined path.