A coaxial cable includes an inner conductor, an insulation covering the inner conductor, an outer conductor covering the insulation, and a sheath covering the outer conductor. The inner conductor is a compressed conductor including a central element wire and multiple peripheral element wires surrounding the central element wire. The inner conductor has a compressibility of 23.0% or more and 35.0% or less in percentage. The compressibility is calculated from a sectional area S1 and the sectional area S2 of the compressed conductor by Compressibility=[1?S2/S1]. The sectional area S1 is calculated from the outside diameter D of the central element wire and the total number n of the central and peripheral element wires by S1=n???0.25?D.sup.2. The outside diameter of the insulation is 1.25 mm or more and less than 1.75 mm.

Aspects of the subject disclosure may include, for example, a transmission medium for propagating electromagnetic waves. The transmission medium can include a core for propagating electromagnetic waves guided by the core without an electrical return path, a rigid material surrounding the core, wherein an inner surface of the rigid material is separated from an outer surface of the core, and a conductive layer disposed on the rigid material. Other embodiments are disclosed.

In an electronic device having a compact form factor, a space-saving harness using bundled or ribbonized strands of micro-coaxial (micro-coax) cable may be utilized to provide signal and/or power interconnects between EMI-generating peripheral components and other components in the device such as those populated on circuit boards. Discrete wires are included in the harness to provide shielding to adjacent micro-coax conductors which may carry high speed signals such as MIPI (Mobile Industry Processor Interface) differential signal pairs and provide power and ground return paths. The discrete wires are subjected to fabrication processes during assembly of the micro-coax harness so that their outer diameters substantially match that of components in the micro-coax cable to thereby facilitate connectorization or termination to the circuit boards and/or other components in the device. The matching outer diameters can also provide a consistent pitch that may facilitate space-saving geometries for the harness, connector, and/or terminations.

A coaxial transmission line structure having a center conductor section having an input contact and an output contact the output contact being larger than the input contact, the center conductor having a plurality of different geometrically shaped, electrically conductive layers having sizes progressively increasing from the input contact to the larger output contact to conductor transition from the input contact to the larger output contact, the electrically conductive layers being electrically interconnected by staggered microvias passing through dielectric layers to the center, and (B) an outer conductor section disposed about, coaxial with, and electrically isolated from, the center conductor by the dielectric layers.

A cable core includes: an internal conductor; a foamed dielectric that includes a fluororesin and is formed on the internal conductor by extrusion molding; and a skin layer that covers the foamed dielectric, and is configured such that a foaming rate of the foamed dielectric is 80% or more, an average foamed cell diameter of the foamed dielectric is 10 m or less, and a standard deviation of a foamed cell diameter of the foamed dielectric is 2.5 or less.

Energy efficient noise dampening coaxial and twisted pair cables include certain layers to improve the quality of signals transmitted over the cables. A coaxial cable includes a conductive core, a first insulating layer surrounding the conductive core, a metal shield layer surrounding the first insulating layer, a second insulating layer surrounding the metal shield layer, a carbon material layer surrounding the second insulating layer, and a protective sheath wrapping the carbon material layer. A twisted pair cable section includes a core section. The core section includes a carbon material core, an insulating layer surrounding the carbon material core, and a metal shield layer surrounding the insulating layer. A plurality of twisted pair cables are disposed in sections or compartments defined by the core section, and between the core section and a protective sheath. Methods for constructing the cables are also disclosed.

A coaxial cable includes a conductor, an insulation layer provided around the conductor, a shield layer provided around the insulation layer, and a sheath provided around the shield layer. The insulation layer includes a first insulation layer, a second insulation layer and a third insulation layer that are arranged in this order from a conductor side. The first insulation layer includes a non-solid extruded layer. The second layer includes a foamed layer not adhering to the first insulation layer. The third insulation layer includes a non-foamed layer adhering to the second insulation layer.

A coaxial transmission line structure having a center conductor section having an input contact and an output contact the output contact being larger than the input contact, the center conductor having a plurality of different geometrically shaped, electrically conductive layers having sizes progressively increasing from the input contact to the larger output contact to conductor transition from the input contact to the larger output contact, the electrically conductive layers being electrically interconnected by staggered microvias passing through dielectric layers to the center, and (B) an outer conductor section disposed about, coaxial with, and electrically isolated from, the center conductor by the dielectric layers.

Various examples are provided for superlattice conductors. In one example, a planar conductor includes a plurality of stacked layers including copper thin film layers and nickel thin film layers, where adjacent copper thin film layers of the copper thin film layers are separated by a nickel thin film layer of the plurality of nickel thin film layers. In another example, a conductor includes a plurality of radially distributed layers including a non-ferromagnetic core; a nickel layer disposed about and encircling the non-ferromagnetic core; and a copper layer disposed on and encircling the nickel layer. In another example, a hybrid conductor includes a core; and a plurality of radially distributed layers disposed about a portion of an outer surface of the core, the plurality of radially distributed layers include alternating ferromagnetic and non-ferromagnetic layers. In other hybrid conductors, the radially distributed layers can utilize magnetic and non-magnetic materials.

A cable assembly, well system, and method of use. A cable assembly may comprise a protective covering and a cable disposed in the protective covering. The cable may comprise a center conductor, an insulator. The insulator may be disposed about the center conductor. The cable may comprise an extra conductive layer, where the extra conductive layer may comprise copper and may be disposed about the insulator, and an outer conductive casing. A well system may comprise a cable assembly, which may comprise a protective covering, and a cable. The well system may further comprise downhole equipment disposed in a wellbore, wherein the downhole equipment may be connected to the cable assembly. A method for using a cable assembly in a well may comprise providing the cable assembly, inserting the cable assembly in the well, and sending a signal current through the cable assembly from the surface to downhole equipment.