High performance flat cable
First Claim
1. A multi conductor flat cable comprising a plurality of balanced pairs of associated conductors for transmitting high frequency signals, the cable exhibiting high impedance, low cross talk electrical performance, the conductors being spaced side-by-side in the same plane and being separable at either end of the cable for individual termination, each individual conductor being separately surrounded by a first insulating medium, each conductor pair being in turn encapsulated within a second insulating medium in a predetermined dimensional configuration, the first insulating medium having a dielectric constant lower than the dielectric constant of the second insulating medium, a conductive shield surrouding the second insulating medium surrounding each conductor pair forming a continuous EMI shield around each conductor pair, and a third insulating medium surrounding the plurality of conductive pairs, the conductive shields being encapsulated in the third insulating medium.
2 Assignments
0 Petitions
Accused Products
Abstract
A high performance controlled impedance low loss low attenuation cable having the characteristics of a shielded twisted pair cable is disclosed. The cable contains a plurality of pairs of associated conductors located in a single plane to give a low profile flat cable suitable for use in undercarpet wiring installations. The cable comprises a plurality of layers of extruded insulating material with a metal foil shield surrounding only associated pairs of conductors. Insulating material having different dielectric constants is employed in conjunction with the encircling foil shield to give the cable the characteristics of a conventional shielded twisted pair cable.
-
Citations
18 Claims
- 1. A multi conductor flat cable comprising a plurality of balanced pairs of associated conductors for transmitting high frequency signals, the cable exhibiting high impedance, low cross talk electrical performance, the conductors being spaced side-by-side in the same plane and being separable at either end of the cable for individual termination, each individual conductor being separately surrounded by a first insulating medium, each conductor pair being in turn encapsulated within a second insulating medium in a predetermined dimensional configuration, the first insulating medium having a dielectric constant lower than the dielectric constant of the second insulating medium, a conductive shield surrouding the second insulating medium surrounding each conductor pair forming a continuous EMI shield around each conductor pair, and a third insulating medium surrounding the plurality of conductive pairs, the conductive shields being encapsulated in the third insulating medium.
-
11. A controlled high impedance, low cross talk, low attenuation multiconductor flat data cable comprising a plurality of balanced pairs of associated conductors having the electrical performance of shielded twisted pair cable for use in undercarpet installations, the cable comprising:
-
a plurality of conductors spaced side by side in the same plane and subdivided into associated conductor pairs; a foam insulation surrounding each conductor and having air dispersed therein to reduce the dielectric constant of the foam insulation, the foam insulation being located in areas of relatively high electric fields; a plurality of separate extruded insulating cores, each extruded insulating core in turn surrounding the foam insulated conductors of each associated pair, each extruded insulating core imparting dimensional stability to retain the conductors of each associated pair on the prescribed spacing and having a greater compressive strength than the foam insulation, the foam insulated conductors being separable from the extruded insulating cores for individual termination; a separate EMI shield surrounding each extruded insulating core and each pair of associated conductors; and an outer extruded insulating body, surrounding each EMI shield, the pairs of associated conductors being embedded in the insulating body. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A high impedance, low cross-talk cable for use in transmitting high frequency signals comprising a plurality of signal conductors, spaced side by side in the same plane, each signal conductor being separately surrounded by first insulating material, a second insulating material surrounding the first insulating material, the dielectric constant of the first insulating material being less than the dielectric constant of the second insulating material, the second insulating material imparting dimensional stability to the signal conductors, the second insulating material individually surrounding each signal conductor and the first insulating material therearound, the second insulating material comprising means for holding the signal conductors in parallel configuration along precisely spaced centerlines, an EMI shield surrounding the second insulating material, and a third insulating material, the EMI shield being encapsulated in the third insulating material.
Specification