Triaxial cable
Coaxial and triaxial cables are used in a variety of electronic applications in which electromagnetic shielding is desired to provide noise-free transmission of the signal carried by the central conductor of the cable. It is known that in many applications a conventional cable having a center conductor surrounded by a single flexible coaxial sheath does not have sufficient shielding properties to provide adequate suppression of EMI or RFI interference. Accordingly, a second flexible coaxial sheath which is a good conductor is positioned in concentric relation to the first coaxial sheath which is also a good conductor. These two sheaths are either in electrical contact or separated by an interlayer of dielectric material having a relatively low dielectric constant and a low dissipation factor. When this interlayer dielectric is used, the construction is commonly called a triaxial cable. A triaxial cable is designed to transmit all the video signals as well as the service signals, such as the audio, interphone, remote control and servocontrol signals, by frequency division multiplexing on the internal coaxial structure:. Triaxial cable is commonly utilized to conduct radiofrequency signals at 20 megaHertz with a nominal impedance of 75 ohms, such as for transmission of video signals. A standard coaxial cable has a center conductor surrounded by a dielectric, a conductive braid, and a covering jacket. In triaxial cable, two additional layers are provided, an outer braid covered by an outer jacket. The inner conductor is surrounded by a dielectric insulation of controlled thickness so that the intermediate shield braid is coaxial therearound, and another dielectric insulation layer surrounds the intermediate shield and in turn is surrounded by the outer shield braid around which is an outer jacket. Triaxial cables are often terminated by triaxial electrical connectors.
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