Abstract: A coaxial connector particularly adaptable for use as a miniature or sub-miniature connector at relatively high frequencies up to 40 GHz and above, which utilizes an inner contact assembly comprising a center conductor member which is retained within a dielectric member which is in turn retained within a conductive insert member, such assembly being positioned within a housing so that the center conductor extends beyond the dielectric and the conductive insert member coaxially of the interior of the housing. Conductive ring members are positioned adjacent each end of such assembly to fixedly hold the assembly at a predetermined position within the housing to prevent axial movement of the center conductor member therein. The diameters and lengths of the above members are selected to provide substantially matched impedance characteristics over the length of the coaxial connector.