Highly foamed coaxial cable

• US 8,017,867 B2
• Filed: 10/13/2008
• Issued: 09/13/2011
• Est. Priority Date: 10/15/2007
• Status: Active Grant

• Current Assignee: LS Cable Limited (LS Corporation)
• Original Assignee: LS Cable And System Limited (LS Cable)
• Inventors: Baek, Jong Won, Cho, Bong Kwon, Shin, Sang Sik
• Primary Examiner(s): MAYO III, WILLIAM H
• Application Number:
  US12/682,644
• Publication Number:
  US 20100212935A1
• Time in Patent Office: 1,065 Days
• Field of Search: 174/110.R, 174/110.F, 174/110.PM, 174/116, 174/120.R, 174/102.R, 174/24, 174/28
• US Class Current: 174/110.00R
• CPC Class Codes: H01B 11/1839 of cellular structure

Abstract

A highly foamed coaxial cable having an inner conductor disposed in the cable, a foamed insulator having porous cells surrounding the inner conductor, an outer conductor surrounding the insulator, and a sheath surrounding the outer conductor and the insulator, wherein the total area of macro cell which has a diameter of at least 300/M is larger than the total area of micro cell which has a diameter smaller than 300/M at cross section of cable.

Claims

1. A highly foamed coaxial cable comprising:

an inner conductor disposed in the cable;

a foamed insulator comprising porous cells and surrounding the inner conductor, wherein the total area of macro cells with a diameter of at least 300 μ

m is larger than the total area of micro cells with a diameter smaller than 300 μ

m in a cross section of cable;

an outer conductor surrounding said insulator; and

a sheath surrounding said outer conductor.

2. The highly foamed coaxial cable according to claim 1, wherein, the percentage of the total area of macro cells in a total cross sectional area of cable is between 63.6% to 92.0%.

3. The highly foamed coaxial cable according to claim 2, wherein the density of the insulator is between 0.05 g/cm³ and 0.20 g/cm³.

4. The highly foamed coaxial cable according to claim 3, including an outer skin layer which surrounds the insulator.

5. The highly foamed coaxial cable according to claim 3, wherein, the foaming rate of said insulator is between 78.9% and 94.7%.

6. The highly foamed coaxial cable according to claim 5, wherein a relative dielectric constant of the insulator is between 1.085 and 1.291.

7. The highly foamed coaxial cable according to claim 6, wherein, the percentage of signal transmission speed in the cable with respect to signal transmission speed in the air is between 88% and 96%.

8. The highly foamed coaxial cable according to claim 7, wherein said insulator is composed by gas foaming the mixture of 50˜

90 wt % of High Density Poly Ethylene, 10˜

50 wt % of Low Density Poly Ethylene, and 0.1˜

3 wt % of nucleating agent.

9. The highly foamed coaxial cable according to claim 1, wherein said insulator is composed by gas foaming the mixture of 50˜

90 wt % of High Density Poly Ethylene, 10˜

50 wt % of Low Density Poly Ethylene, and 0.1˜

3 wt % of nucleating agent.