A communication cable suitable for Power over Ethernet applications may include a jacket that defines a cable core and a plurality of twisted pairs of conductors disposed within the cable core. Each of the conductors may have a diameter of at least approximately 0.0240 inches or the equivalent of a 22 American Wire Gauge conductor. Additionally, each of the plurality of twisted pairs may have a different twist lay, and the respective twist lays may be selected such that the communications cable satisfies the requirements of a Category 6A cabling standard. The communications cable may have a delay skew of less than approximately 45 nanoseconds per 100 meters and a direct current resistance unbalance between pairs of less than approximately 100 milliohms per 100 meters.

The present disclosure relates to a magnetic shielding tape, which is capable of shielding a high-to-low frequency of a signal transmitted through a cable in shielding of a magnetic field which flows in such a cable or is emitted therefrom, and a method for manufacturing the same. The basic magnetic shielding tape comprises: a thin film magnetic layer including at least one metal ribbon sheet which is divided into a plurality of fine pieces by flaking process, and a gap provided between adjacent fine pieces among the plurality of fine pieces; a cover film layer adhered to one side surface of the thin film magnetic layer through a first adhesive layer; anda conductive layer adhered to the other side surface of the thin film magnetic layer through a second adhesive layer, wherein a size of the gap is determined according to a frequency band of the signal.

Two electromagnetic interference (EMI) controlling tape application methodologies for unshielded twisted pair (UTP) cable include Fixed Tape Control (FTC) and Oscillating Tape Control (OTC). In FTC, tape application angle and edge placement are controlled to maintain position of the tape edges over a base of nonconductive filler in the cable. In OTC, the tape application angle is continuously varied, resulting in crossing of the tape edges over all of the pairs of conductors with varying periodicity. In both implementations, the filler allows a cylindrical shape.

A communications cable having a plurality of twisted pairs of conductors and various embodiments of a metal foil tapes between the twisted pairs and a cable jacket is disclosed. In some embodiments, a metal foil tape includes a discontinuous metal layer and a polymer layer bonded to the metal layer. Portions of the metal layer and the polymer layer are deformed to form a plurality of dimples, the dimples forming air gaps between the polymer layer and the cable core or a barrier layer if used. The air gaps lower the overall dielectric constant between the metal layer and the cable core, thereby lowering the alien capacitance of the communications cable.

A cable includes a first twisted pair of insulated conductors, a second twisted pair of insulated conductors, a shielding tape, and an outer jacket surrounding the first twisted pair of insulated conductors, the second twisted pair of insulated conductors and the shielding tape. The shielding tape includes a substrate and a plurality of conductive shielding segments. The plurality of conductive shielding segments is disposed on the substrate. Each conductive shielding segment is spaced from each immediately adjacent conductive shielding segment in a longitudinal direction.

A communication cable that has a reduced diameter while ensuring a required magnitude of characteristic impedance. The shielded communication cable contains a twisted pair containing a pair of insulated wires twisted with each other. Each of the insulated wire contains a conductor that has a tensile strength of 400 MPa or higher, and an insulation coating that covers the conductor. The shielded communication cable 1 further contains a shield that is made of a conductive material and surrounds the twisted pair. The shielded communication cable has a characteristic impedance of 10010.

An electromagnetic wave absorption cable comprising an electromagnetic-wave-absorbing tape spirally wound around the inner insulating sheaths surrounding conductor wires, an insulating layer, and an electromagnetic-wave-reflecting layer; the electromagnetic-wave-absorbing tape being constituted by laterally partially overlapped two electromagnetic-wave-absorbing films; a thin metal film of each electromagnetic-wave-absorbing film being provided with large numbers of substantially parallel, intermittent, linear scratches with irregular widths and intervals in plural directions; the linear scratches in each electromagnetic-wave-absorbing film having a crossing angle s of 30-90; the linear scratches in both electromagnetic-wave-absorbing films being crossing; and the total (D.sub.2+D.sub.3) of the longitudinal width D.sub.2 of an overlapped portion of the electromagnetic-wave-absorbing films and the longitudinal width D.sub.3 of an overlapped portion of the electromagnetic-wave-absorbing tape being 30-70% of the longitudinal width D of the electromagnetic-wave-absorbing tape.

A communications cable having a plurality of twisted pairs of conductors and various embodiments of a metal foil tape between the twisted pairs and a cable jacket is disclosed. In some embodiments, the metal foil tapes include a cut that creates discontinuous regions in a metal layer of the metal foil tapes. When the metal foil tapes are wrapped around the cable core, the discontinuous regions overlap to form at least one overlapping region. The cuts are formed such that overlapping region is small and limits current flow through the metal foil tapes, thereby minimizing alien crosstalk in the communications cable.

A differential transmission cable includes a pair of signal lines, an insulation covering the pair of signal lines, and a shielding tape that includes a conductor layer and an insulation layer formed on one surface of the conductor layer and is helically wound around the insulation. The diameter of the signal line is thinner than at least 30 AWG (American Wire Gauge), and differential characteristic impedance is not less than 80 and not more than 120.

Methods for forming discontinuous shields or shield structures for use in a cable are provided. A layer of dielectric material may be provided that extends in a longitudinal direction and has a first width across a width direction perpendicular to the longitudinal direction. Additionally, a layer of electrically conductive material may be formed on the dielectric material, and the layer of electrically conductive material may extend in the longitudinal direction and may have a second width across the width direction that is less than the first width. Respective gaps may be formed through both the electrically conductive material at a plurality of locations along the longitudinal direction, and each gap may span across the width direction by a distance greater than the second width but less than the first width.