Coaxial cable having improved mechanical and electrical properties

• US 6,756,538 B1
• Filed: 01/29/2003
• Issued: 06/29/2004
• Est. Priority Date: 01/29/2003
• Status: Expired due to Fees

• Current Assignee: Conductores Monterrey SA de CV (Xignux SA de CV)
• Original Assignee: Conductores Monterrey SA de CV (Xignux SA de CV)
• Inventors: Montes-Valdez, Sergio, Murga-Gonzalez, Patricio G., Ranc-Gomez, Jose
• Primary Examiner(s): Mayo, III, William H.
• Application Number:
  US10/352,461
• Time in Patent Office: 517 Days
• Field of Search: 174/28, 174/102.R, 174/110.R, 174/110.F, 174/110.FC, 174/102.D, 174/36, 174/110.PM, 174/120.R, 174/120.AR, 428/383, 428/461
• US Class Current: 174/28
• CPC Class Codes: H01B 11/1839 of cellular structure

Abstract

A coaxial cable has a return loss higher than 36 dB and a structural return loss higher than 38 dB within the frequency range from 500 to 1000 MHz. The coaxial cable has a polyolefin inner solid insulating layer having an adhesive strength of between 40 and 60 lb/in² to a central conductor, an intermediate foamed polyolefin layer surrounding the polyolefin inner solid insulating layer, an outer polyolefin solid insulating layer surrounding the intermediate foamed polyolefin layer, a metallic screen layer that has of a shield made of a metallic foil and a braid surrounding the outer polyolefin solid insulation layer, and a protective jacket surrounding the metallic screen layer.

Claims

1. A coaxial cable having a return loss higher than 36 dB and a structural return loss higher than 38 dB within the frequency range from 500 to 1000 MHz, the coaxial cable comprising:

a central conductor;

an inner polyolefin solid insulating layer surrounding said central conductor and being adhered to said central conductor in an amount of between 40 and 60 lb/in²;

an intermediate foamed polyolefin insulating layer surrounding a surface of said inner polyolefin solid insulating layer opposite said central conductor;

an outer polyolefin solid insulating layer surrounding a surface of said intermediate foamed polyolefin insulating layer opposite said inner polyolefin solid insulating layer;

a metallic screen layer being a shield of a metallic foil and a braid, said metallic screen layer surrounding a surface of said polyolefin solid insulating layer opposite said intermediate foamed polyolefin insulating layer; and

a protective jacket surrounding a surface of said metallic screen layer opposite said outer polyolefin solid insulating layer.

2. The coaxial cable of claim 1, said inner polyolefin solid insulating layer comprising a blend of a low density polyolefin having a 8 to 15 weight percent of an ionic hydrocarbon polymer containing monocarboxylic acid comonomers, said monocarboxylic acid units being partially neutralized with metal ions.

3. The coaxial cable of claim 1, said central conductor being a copper material.

4. The coaxial cable of claim 1, said central conductor being copper clad steel.