Helical line rotary joint

Claim 1

HIGH-FREQUENCY ROTARY JOINT COMPRISING A CYLINDRICAL TUBULAR CONDUCTIVE SHELL HAVING A CENTRAL LONGITUDINAL AXIS AND COMPRISING TWO MUTUALLY COMPLEMENTAL PORTIONS INTERCONNECTED TO BE RELATIVELY ROTATABLE ABOUT SAID AXIS, TWO COAXIAL TRANSMISSION LINE FITTINGS, EACH HAVING AN OUTER CONDUCTOR JOINED TO ONE OF SAID PORTIONS AT A LOCATION SPACED LONGITUDINALLY OF THE SHELL FROM THE OTHER OUTER CONDUCTOR, AND EACH HAVING AN INNER CONDUCTOR PROJECTING IN INSULATED RELATIONSHIP INTO THE SHELL, TWO HELICAL LINES COMPRISING ELONGATED CONDUCTIVE HELICES OF RESPECTIVELY DIFFERENT HELIX DIAMETERS, OF SUBSTANTIALLY EQUAL PROPAGATION VELOCITY CHARACTERISTICS AND OF RELATIVELY OPPOSITE PITCH, MEANS SUPPORTING THE HELICES IN MUTUAL LONGITUDINALLY OVERLAPPING RELATIONSHIP AND COAXIAL WITHIN THE SHELL, THE HELIX OF SMALLEST DIAMETER BEING INSULATIVELY SPACED WITHIN THAT OF LARGEST DIAMETER AND THE LATTER BEING INSULATIVELY SPACED WITHIN THE SHELL, ONE END OF EACH HELICAL LINE BEING ELECTRICALLY CONNECTED TO THE INWARDLY PROJECTING END OF ONE LINE FITTING, AND THE OPPOSITE END OF EACH HELICAL LINE FORMING SUBSTANTIALLY AN OPEN-CIRCUIT TERMINATION THEREOF, SAID HELICAL LINES BEING PHYSICALLY SUPPORTED FROM THE RESPECTIVE SHELL PROTIONS.