A signal transmission device of the present disclosure has a bus cable, conductive parts and a connection device. The bus cable formed by sequentially stacking a conductor layer, a metal layer and an insulation layer has signal wires. Each of the signal wires has a predetermined width, and each adjacent twos of the signal wires have a predetermined gap therebetween. Each two of the conductive parts have a specific gap therebetween, and each of the conductive part has a first contact terminal and a second contact terminal thereon, wherein the first contact terminals electrically contact the metal layer. The connection device electrically connected to the bus cable has signal conduction wires and ground wires. The signal conduction wires electrically contact the signal wires one by one. The second contact terminals electrically contact the ground wires one by one.

A cable includes at least one inner conductor and an insulation layer surrounding the inner conductor. An outer conductive layer surrounds the insulation layer and center conductor and includes a carbon nanotube substrate having opposing face surfaces and edges. One or more metals are applied as layer(s) to the opposing face surfaces and edges of the carbon nanotube substrate for forming a metallized carbon nanotube substrate. The metallized carbon nanotube substrate is wrapped to surround the insulation layer and center conductor for forming the outer conductive layer. Embodiments of the invention include a braid layer positioned over the outer conductive layer. The braid layer is woven from of plurality of carbon nanotube yarn elements made of a plurality of carbon nanotube filaments. The carbon nanotube filaments include a carbon nanotube core and metal applied as a layer on the carbon nanotube core for forming a metallized carbon nanotube filaments and yarns woven to form the braid layer.

This disclosure is a transmission line, which comprises an inner conducting core, an insulation layer, a conductive layer and an outer sheath. The insulation layer covers the inner conducting core, the conductive layer covers the insulation layer, and the outer sheath covers the conductive layer. The outer sheath at one end or both ends of the transmission line includes a thinned part, wherein the cross-sectional area of the thinned part is smaller than that of the outer sheath. The conductive layer is folded to the thinned part of the outer sheath, and forms a folded part on the thinned part to reduce the cross-sectional area of one end or both ends of the transmission line. A connector is connected to the transmission line without reducing the wire diameter of the inner conducting core, so as to increase the signal transmission distance of the transmission line.

This invention is a coaxial cable and a signal transmission assembly thereof. The coaxial cable includes a conductive cored wire, an insulating tape and a metal foil Mylar film a conductive layer and an outer jacket. The conductive cored wire includes an outer peripheral surface. The insulating tape is wrapped onto the outer peripheral surface of the conductive cored wire in a spiral winding manner or a longitudinal wrapping manner. The metal foil Mylar film is wrapped onto the insulating tape in a spiral winding manner, a longitudinal wrapping manner, and the conductive layer is wrapped onto the metal foil Mylar film. The jacket is wrapped onto the conductive layer. A distance between the conductive core wire and the metal foil Mylar film can be adjust by control the number of wrapping turns of the insulating tape to improve the yield rate of the coaxial cable manufacturing.

A cable includes at least one inner conductor and an insulation layer surrounding the inner conductor. An outer conductive layer surrounds the insulation layer and center conductor and includes a carbon nanotube substrate having opposing face surfaces and edges. One or more metals are applied as layer(s) to the opposing face surfaces and edges of the carbon nanotube substrate for forming a metallized carbon nanotube substrate. The metallized carbon nanotube substrate is wrapped to surround the insulation layer and center conductor for forming the outer conductive layer. Embodiments of the invention include a braid layer positioned over the outer conductive layer. The braid layer is woven from of plurality of carbon nanotube yarn elements made of a plurality of carbon nanotube filaments. The carbon nanotube filaments include a carbon nanotube core and metal applied as a layer on the carbon nanotube core for forming a metallized carbon nanotube filaments and yarns woven to form the braid layer.

A composite cable 1 for data and video signal communication, the composite cable including: an inner layer 11 formed by twisting multiple small diameter electric wires and multiple large diameter electric wires 50 (each having an outer diameter equivalent to the small diameter electric wire or more); and an outer layer 12 formed by twisting multiple coaxial wires 60 (each having an outer diameter equivalent to the large diameter electric wire 50 or more) and one of the large diameter electric wires 50 around the inner layer 1, wherein the coaxial wire 60 and the large diameter electric wire 50 are in close contact within the outer layer 12.

A cable may include an inner conductor and an outer conductor coaxially arranged around the inner conductor. A dielectric strength member may be positioned between the inner and outer conductors. The dielectric strength member may have a thickness between 0.1 mm and 50 mm and a tensile strength of at least 5,000 MPa. Additionally, a jacket may be formed around the outer conductor.

A shielded electric wire includes an electric wire including a conductor portion and a cover portion covering the conductor portion, a shielded braid formed of a conductive linear material, the shielded braid covering an outer periphery of the cover portion and a sheath formed of an insulating resin, the sheath being provided around the shielded braid. The electric wire and the shielded braid together form an electric wire assembly. A flexible value of the sheath is equal to or smaller than a flexible value of the electric wire assembly, the flexible value being a value of a load required for bending an object for a predetermined extent.

A coaxial cable (10) includes an outer barrier (12, 14, 16) that seals the coaxial cable from air and protects the cable's conductors (18, 20) form oxidation in a fire. Such an outer protective barrier may include a fire retardant tape. A dielectric (22) separates the conductors and may comprise a ceramic (23) embedded in a dielectric material (25), or ceramic beads in a braided ceramic mesh.

Methods of testing and installing fire-resistant coaxial cables are described. The dielectric between the coax cable's central conductor and outer coaxial conductor ceramify under high heat, such as those specified by common fire test standards (e.g., 1850° F./1010° C. for two hours). The dielectric can be composed of ceramifiable silicone rubber, such as that having a polysiloxane matrix with inorganic flux and refractory particles. Because thick layers of uncured ceramifiable silicone rubber deform under their own weight when curing, multiple thinner layers are coated and serially cured in order to build up the required thickness. A sacrificial sheath mold is used to hold each layer of uncured ceramifiable silicone rubber in place around the central conductor while curing. The outer conductor can be a metal foil, metal braid, and/or corrugated metal. Another layer of extruded ceramifiable silicone dielectric or an outer wrap of ceramic fiber yarn surrounds the outer conductor and continues to insulate it from the outside if a low smoke zero halogen jacket burns away.