TELECOMMUNICATION WIRE WITH LOW DIELECTRIC CONSTANT INSULATOR

• US 20090078439A1
• Filed: 07/11/2008
• Published: 03/26/2009
• Est. Priority Date: 07/12/2007
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Wiekhorst, David
• Granted Patent: US 7,816,606 B2
• Time in Patent Office: Days
• US Class Current: 174/28
• CPC Class Codes: H01B 11/002 Pair constructions
• CPC Class Codes: H01B 7/0233 Cables with a predominant gas dielectric
• CPC Class Codes: H01B 7/0291 comprising two or more layers of insulation having different electrical properties

Abstract

A telecommunication wire having an electrical conductor is surrounded by an insulator. The insulator includes a main body made of a first polymeric insulator material. The main body defines a plurality of channels that run generally along a length of the electrical conductor. Each channel includes a first region and a second region. The first regions are filled with a second polymeric insulator material having a dielectric constant that is lower than the first polymeric insulator material. The second regions are filled with a gas such as air.

Claims

1. A telecommunication wire comprising:

an electric conductor; and

a dielectric insulator surrounding the electrical conductor, the dielectric insulator including a main body defining a plurality of channels that run generally along a length of the electrical conductor, the main body being constructed of a first polymeric material;

the channels defined by the main body of the insulator each including first and second regions, the first regions being occupied by a second polymeric material having a dielectric constant lower than a dielectric constant of the first polymeric material, and the second regions being occupied by a gas.

2. The telecommunication wire of claim 1, wherein the gas is air.

3. The telecommunication wire of claim 1, wherein the first polymeric material includes a solid fluoropolymer, and the second dielectric material includes a foamed fluoropolymer.

4. The telecommunication wire of claim 3, wherein the first polymeric material includes FEP and the second polymeric material includes foamed FEP.

5. The telecommunication wire of claim 1, wherein the insulator has a dielectric constant less than 1.79.

6. The telecommunication wire of claim 1, wherein the channels have open ends that face toward the electrical conductor.

7. The telecommunication wire of claim 6, wherein the second regions of the channels are filled with air, and wherein the second regions of the channels are positioned between the first regions of the channel and the electrical conductor.

8. The telecommunication wire of claim 1, wherein the dielectric insulator defines at least eight channels.

9. The telecommunication wire of claim 1, wherein the dielectric insulator defines twelve channels.

10. A telecommunication wire comprising:

an electrical conductor having a periphery; and

a dielectric insulator arrangement surrounding the electrical conductor, the dielectric insulator including an outer layer and a plurality of legs that project radially inwardly from the outer layer toward a center axis of the dielectric insulator, the outer layer being formed from a first polymeric material, the legs defining a plurality of channels spaced circumferentially around a periphery of the electrical conductor, the channels having closed ends positioned at the outer layer and open ends that face radially inwardly toward the center axis, each channel including first and second regions, the first regions being occupied by a second polymeric material having a dielectric constant lower than a dielectric constant of the first polymeric material, and the second regions being occupied by a gas.

11. The telecommunication wire of claim 10, wherein the gas is air.

12. The telecommunication wire of claim 10, wherein the second polymeric material is a foamed polymer.

13. The telecommunication wire of claim 10, wherein free ends of the legs are adapted to engage an outer diameter of the electrical conductor.

14. The telecommunication wire of claim 10, wherein the outer layer and legs of the dielectric insulator are formed from a solid fluoropolymer.

15. The telecommunication wire of claim 10, wherein the dielectric insulator has a dielectric constant less than 1.79.

16. A telecommunication cable comprising:

an outer jacket; and

a cable core surrounded by the outer jacket and being twisted about a center axis of the telecommunication cable at a predetermined lay length, the cable core including a plurality of twisted wire pairs separated by a filler, each of the twisted pairs including first and second telecommunication wires, at least one of the telecommunication wires including;

an electric conductor; and

a dielectric insulator surrounding the electrical conductor, the dielectric insulator being formed of a first polymeric material and defining channels extending along a length of the electric conductor, each channel defining a first region at least partially filled with a dielectric non-gaseous material and a second region at least partially filled with a dielectric gas, the dielectric non-gaseous material including a different polymeric material than the first polymeric material.

17. The telecommunication cable of claim 16, wherein the cable core includes four twisted wire pairs.

18. The telecommunication cable of claim 16, wherein the dielectric non-gaseous material includes a dielectric foam.

19. The telecommunication cable of claim 16, wherein the first region of each channel corresponds to more than 40% but less than 90% of a total cross-sectional area of the channel.

20. The telecommunication cable of claim 16, wherein the first region of each channel corresponds to more than 50% but less than 80% of a total cross-sectional area of the channel.