Browse Prior Art Database

Shielded Cable and Process of Manufacture

IP.com Disclosure Number: IPCOM000048417D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Evans, RT: AUTHOR [+3]

Abstract

The drawing shows a section of a shielded cable having a signal conductor 2, a ground conductor 3, a supporting dielectric 4, a metal shielding layer 5 and a protective cover 6. In the process of manufacture, the conductors 2 and 3 are first extruded with a low dielectric constant material, such as a foamed polymer, that forms the support 4. A skiving operation along the righthand edge of the extruded dielectric exposes a a thin, adherent, metal coating is formed over the outer surface of the dielectric support 4 and in electrical contact with the exposed surface of ground conductor 3. Ground conductor 3 assures electrical continuity of the outer shield 5. The protective cover 6 is then formed.

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Shielded Cable and Process of Manufacture

The drawing shows a section of a shielded cable having a signal conductor 2, a ground conductor 3, a supporting dielectric 4, a metal shielding layer 5 and a protective cover 6. In the process of manufacture, the conductors 2 and 3 are first extruded with a low dielectric constant material, such as a foamed polymer, that forms the support 4. A skiving operation along the righthand edge of the extruded dielectric exposes a a thin, adherent, metal coating is formed over the outer surface of the dielectric support 4 and in electrical contact with the exposed surface of ground conductor 3. Ground conductor 3 assures electrical continuity of the outer shield 5. The protective cover 6 is then formed.

The cross-section as shown in the drawing is an elipse with eccentricity of
0.64, truncated on both ends to 10 percent its major axis. The wires are unbalanced in size, for example, a #33 signal conductor and a #30 ground conductor. This shape provides a positive orientation for stripping and termination (as contrasted with a coaxial cable of circular section), and it provides a preferential bending plane to minimize stress between the ground lead and the metallization layer 5.

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