Abstract: A subassembly for microwave structure such as a connector is described. An insulator for spacing of at least one center conductor is formed of PTFE (polytetrafluoroethylene) and effectively bonded to at least one center conductor to be used in the connector. The PTFE may be bonded to the conductor by employing an intermediate layer of FEP (fluorinated ethylene-propylene) that can be bonded to the center conductor. Bonding of the components into an integral subassembly is done in a single step involving heating and pressurizing a pre-assembly in a mold to a sufficient amount and for a sufficient time to provide an acceptably strong bond. Superior electrical characteristics such as a low SWR and insertion loss are achieved in captivated and/or sealed connectors. A good seal is achieved between the insulator and the outer conductor by forming an undercut in the latter, filling it with silicone grease and enabling a temporarily mechanically-collapsed bead on the insulator to expand into the undercut.

Abstract: The subject invention is directed to a coaxial connector or interseries adapter comprising of at least one metallic center conductor, an insulating captivation bead surrounding said center conductor and at least one metallic coaxial sheath disposed in coaxial relationship to said at least one center conductor. The captivation bead imparts a dramatic increase in mechanical strength to the connector or adapter preventing axial or radial movement of the center contact, in relation to the outer contact, when differential forces are applied between the center and outer contact. The captivation bead in the coaxial connector or adapter can be matched to achieve a low VSWR. Surprisingly the captivation bead allows a dramatic increase in power handling capability.