Patent EP0061829A1 successfully refreshed from Google Patents.
EP0061829A1
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EP
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Shielded ribbon cable
Assignee: 3M Co
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Filing: 1982-02-11
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Granted: —
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Expires: 2002-02-11
Abstract
Abstract A fulty shielded flexible ribbon cable 10 having transmission line electrical characteristics and flexible ribbon cable mechanical characteristics capable of easy mass termination. The cable 10 has a plurality of circular uniformly spaced signal conductors 12 lying in a single plane encased in insulation 14 having an effectively uniform dielectric constant of not more than 3.0. A sheet conductor 16 is bonded to the insulation 14 providing both transverse and longitudinal electrical continuity. The ratio of the diameter 26 of the signal conductors 12 to the distance 24 between centers of the signal conductors 12 is between 0.16 and 0.42. The ratio between the thickness 22 of the cable 10 at the inner surface of the sheet conductor 16 to the distance 24 between centers of the signal conductors 12 is not more than 1.5.
Inventors
- 👤 Murry Olyphant, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/08; H01B7/0861
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
242 words
A flexible ribbon cable 10 having a signal portion 32 comprising: a plurality of substantially longitudinally parallel circular conductors 12 having a uniform diameter 26 and lying in a single plane, said plurality of conductors 12 having transversely uniform predetermined and longitudinally uniform cross-sectional spacing 24; insulation 14 encasing said plurality of conductors 12 having an effectively uniform dielectric constant of not more than 3.0 and having two outer surfaces substantially parallel to said single plane; and a sheet conductor 16 having two inner surfaces conforming to said two outer surfaces of said insulation 14, said sheet conductor 16 being bonded to said insulation 14 on said two outer surfaces, and said sheet conductor 16 encasing said insulation 14 on substantially all cross-sectional sides and providing both transverse and longitudinal electrical continuity; where the ratio of the value of the diameter 26 of said parallel circular conductors 12 to the value of the distance 24 between centers of said parallel circular conductors 12 is not less than 0.16 and not more than 0.42; and where the ratio of the value of the distance 22 between said two inner surfaces of said sheet conductor 16 to., the value of the distance 24 between centers of said parallel circular conductors 12 is not more than 1.5; whereby the electrical characteristics of said signal portion 32 of said flexible ribbon cable 10 approximate the electrical characteristics of a coaxial cable with a comparable insulation thickness.
Claim 2
Dependent Claim
242 words
A flexible ribbon cable 10 having a signal portion 32 comprising: a plurality of substantially longitudinally parallel circular conductors 12 having a uniform diameter 26 and lying in a single plane, said plurality of conductors 12 having transversely uniform predetermined and longitudinally uniform cross-sectional spacing 24; insulation 14 encasing said plurality of conductors 12 having an effectively uniform dielectric constant of not more than 3.0 and having two outer surfaces substantially parallel to said single plane; and a sheet conductor 16 having two inner surfaces conforming to said two outer surfaces of said insulation 14, said sheet conductor 16 being bonded to said insulation 14 on said two outer surfaces, and said sheet conductor 16 encasing said insulation 14 on substantially all cross-sectional sides and providing both transverse and longitudinal electrical continuity; where the ratio of the value of the diameter 26 of said parallel circular conductors 12 to the value of the distance 24 between centers of said parallel circular conductors 12 is not less than 0.16 and not more than 0.42; and where the ratio of the value of the distance 22 between said two inner surfaces of said sheet conductor 16 to., the value of the distance 24 between centers of said parallel circular conductors 12 is not more than 1.5; whereby the electrical characteristics of said signal portion 32 of said flexible ribbon cable 10 approximate the electrical characteristics of a coaxial cable with a comparable insulation thickness.
Claim 3
Dependent Claim
30 words
A flexible ribbon cable 10 as in claim 1 wherein said insulation 14 has a dielectric loss tangent of I not more than 0.005 between 1 megahertz and 1 gigahertz.
Claim 4
Dependent Claim
38 words
A flexible ribbon cable 10 as in claim 2 wherein said insulation 14 is a material selected from the group consisting of polyurethane, polyethylene, polypropylene, Teflon® TFE polymeric dielectrics, Teflon® FEP polymeric dielectrics, EPDM rubber and EP rubber.
Claim 5
Dependent Claim
24 words
A ribbon cable 10-as in claim 1 wherein said sheet conductor 16 has a maximum resistivity of not more than 3.5 milliohms per square.
Claim 6
Dependent Claim
34 words
A flexible ribbon cable 10 as in claim 4 wherein said sheet conductor 16 is cigarette wrapped around said insulation 14 with an overlap along one of said two outer surfaces of said insulation.
Claim 7
Dependent Claim
33 words
A flexible ribbon cable 10 as in claim 1 wherein said insulation 14 has at least one outer surface being ridged longitudinally with said ridges corresponding to said plurality of circular conductors 12.
Claim 8
Dependent Claim
41 words
A flexible ribbon cable 10 as in claim 1 wherein said sheet conductor 12 is strippable from said insulation 14 so that removal of said sheet conductor 16 may be effected where desirable in order to terminate said ribbon cable 10.
Claim 9
Dependent Claim
33 words
A flexible ribbon cable 10 as in claim 7 wherein an adhesive 20 intimately bonds said two inner surfaces of said sheet conductor 16 to said two outer surfaces of said insulation 14.
Claim 10
Dependent Claim
88 words
A flexible ribbon cable 10 as in claim 1 wherein the dimensions of said signal portion 32 are determined by: where b is the value of said spacing 22 between said two inner surfaces of said sheet conductor 16; where c is the value of said distance 24 between centers of said parallel circular conductors 12; and where d is the value of said diameter 26 of said parallel circular conductorsl2 ; whereby the backward crosstalk for said signal portion 32 is limited to not more than 7.5%.
Claim 11
Dependent Claim
87 words
A flexible ribbon cable 10 as in claim 1 wherein the dimensions of said signal portion 32 are determined by: where b is the value of said spacing 22 between said two inner surfaces of said sheet conductor 16; where c is the value of said distance 24 between centers of said parallel circular conductors 12; and where d is the value of said diameter 26 of said parallel circular conductors 12; whereby the backward crosstalk for said signal portion is limited to not more than 5%.
Claim 12
Dependent Claim
44 words
ll. A flexible ribbon cable 10 as in claim 1 wherein said insulation 14 comprises separate layers 14a and 14b of dielectric material lying just above and just below said single plane and intimately bonded together and to said plurality of circular conductors 12.
Claim 13
Dependent Claim
32 words
A ribbon cable 10 as in claim 11 wherein said separate layers 14a amd 14b of dielectric material are bonded with an adhesive 30 comprising a block copolymer elastomer stabilized with antioxidants.
Claim 14
Dependent Claim
32 words
) 13. A ribbon cable 10 as in claim 12 wherein said adhesive 30 for said separate layers of dielectric material is R-10 rubber as manufactured by Minnesota Mining and Manufacturing Company.
Claim 15
Dependent Claim
183 words
A flexible ribbon cable 10, having a signal portion 32 comprising: a plurality of substantially longitudinally parallel circular conductors 12 lying in a single plane; insulation 14 encasing a said plurality of conductors 12 having an effectively uniform dielectric constant of not more than 3.0 and having two outer surfaces substantially parallel to said single plane; and a sheet conductor 16 having two inner surfaces conforming to said two outer surfaces of said insulation 1 4, said sheet conductor 16 being bonded to said insulation 14 on said two outer surfaces, and said sheet conductor 16 encasing said insulation 14 on substantially all cross-sectional sides and providing both transverse and longitudinal electrical continuity; where said plurality of parallel circular conductors 12 have a transversely predetermined and longitudinally uniform cross-sectional spacing 24 between centers of from 45 mils to 65 mils; where the distance 22 between said two inner surfaces of said sheet conductor is from 35 to not more than 75 mils; and where the cross-sectional area of said parallel circular conductors 12 is from 32 AWG to not more than 26 AWG.
Claim 16
Dependent Claim
183 words
A flexible ribbon cable 10, having a signal portion 32 comprising: a plurality of substantially longitudinally parallel circular conductors 12 lying in a single plane; insulation 14 encasing a said plurality of conductors 12 having an effectively uniform dielectric constant of not more than 3.0 and having two outer surfaces substantially parallel to said single plane; and a sheet conductor 16 having two inner surfaces conforming to said two outer surfaces of said insulation 1 4, said sheet conductor 16 being bonded to said insulation 14 on said two outer surfaces, and said sheet conductor 16 encasing said insulation 14 on substantially all cross-sectional sides and providing both transverse and longitudinal electrical continuity; where said plurality of parallel circular conductors 12 have a transversely predetermined and longitudinally uniform cross-sectional spacing 24 between centers of from 45 mils to 65 mils; where the distance 22 between said two inner surfaces of said sheet conductor is from 35 to not more than 75 mils; and where the cross-sectional area of said parallel circular conductors 12 is from 32 AWG to not more than 26 AWG.
References Cited (Backward Citations)
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