Patent US3763306A successfully refreshed from Google Patents.
US3763306A
Expired / Lapsed
US
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Flat multi-signal transmission line cable with plural insulation
Assignee: ABB Installation Products Inc
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Filing: 1972-03-17
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Granted: 1973-10-02
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Expires: 1992-03-17
Abstract
Abstract A multi-signal transmission line is formed of a flat cable having a plurality of generally parallel conductors embedded in a dielectric core material, with an insulator jacket encasing the flat cable and being made of a dielectric material having a higher dielectric constant than the dielectric core material of the flat cable. The resulting composite transmission line cable insures that substantially all of the transverse electromagnetic propagation field created by the passage of a fast rise time pulse in a signal conductor is confined to the geometric area of the cable and the cable functions in a manner to greatly reduce the far end line-to-line interference (crosstalk) between the signal conductor and adjacent quiet lines.
Inventors
- 👤 J Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:38
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/08; H01B7/0838; H01B11/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
133 words
A composite multi-signal transmission line cable for transmitting fast rise time electrical pulses with minimum farend crosstalk comprising: a flat multi-conductor cable including a plurality of generally parallel conductors embedded in a planar sheet of insulation material having a dielectric constant, with selected conductors adapted to be connected to ground, while remaining conductors are used as signal-carrying conductors; and an insulator jacket surrounding the flat multi-conductor cable and in intimate contact with said insulation material; said insulator jacket being made of a dielectric material having a dielectric constant greater than the dielectric constant of said insulation material whereby the electrical effect of the composite of the insulation material and the insulator jacket is to establish a balance between the inductive and capacitive coupling coefficients between adjacent signal-carrying conductors thereby minimizing the far-end cross-talk.
Claim 2
Dependent Claim
133 words
A composite multi-signal transmission line cable for transmitting fast rise time electrical pulses with minimum farend crosstalk comprising: a flat multi-conductor cable including a plurality of generally parallel conductors embedded in a planar sheet of insulation material having a dielectric constant, with selected conductors adapted to be connected to ground, while remaining conductors are used as signal-carrying conductors; and an insulator jacket surrounding the flat multi-conductor cable and in intimate contact with said insulation material; said insulator jacket being made of a dielectric material having a dielectric constant greater than the dielectric constant of said insulation material whereby the electrical effect of the composite of the insulation material and the insulator jacket is to establish a balance between the inductive and capacitive coupling coefficients between adjacent signal-carrying conductors thereby minimizing the far-end cross-talk.
Claim 3
Dependent Claim
24 words
A composite multi-signal transmission line cable as in claim 1 wherein the insulation material is polyethylene, and the insulator jacket is made of vinyl.
Claim 4
Dependent Claim
98 words
A composite multi-signal transmission line cable as in claim 1 wherein the flat cable includes alternating flat and round conductors, with the round conductors being the signal carrying conductors, and wherein the characteristic impedance of the cable (Zd) is expressed by the following relationship: Zd (1/ Square Root epsilon ) 42 cosh 1 (1.8x2 - (1.25x2- 1) ) where d diameter of round conductors; p spacing between a round conductor and an imaginary round conductor falling within the confines of the adjacent flat conductor; x p/d; and epsilon relative dielectric constant of insulation dielectric material to air dielectric.
Claim 5
Dependent Claim
26 words
A composite multi-signal transmission line cable as in claim 1 wherein the signal conductors are round in cross-section, while the ground conductors are rectangular in cross-section.
Claim 6
Dependent Claim
20 words
A composite multi-signal transmission line cable as in claim 1 wherein the insulator jacket is extruded over the flat cable.
Claim 7
Dependent Claim
36 words
A composite multi-signal transmission line cable as in claim 1 wherein the thickness of the jacket is approximately two-thirds that thickness of a theoretical cable core capable of confining approximately 98 percent of the TEM field.
Claim 8
Dependent Claim
20 words
A composite multi-signal transmission line cable as in claim 4 wherein the insulator jacket is bonded to the flat cable.
Claim 9
Dependent Claim
42 words
A composite multi-signal transmission line cable as in claim 1 wherein the total thickness of the insulation material of the flat cable is sufficient to contain substantially all of the transverse electromagnetic field area generated by a signal passing through a conductor.
Claim 10
Dependent Claim
27 words
A composite multi-signal Transmission line cable as in claim 1 wherein the insulator jacket is made of a material which is self-extinguishing when exposed to a flame.
Claim 11
Dependent Claim
131 words
A composite multi-signal transmission line cable for transmitting fast rise time electrical pulses with minimum far-end crosstalk comprising: a flat multi-conductor cable including a plurality of generally parallel conductors alternating in cross-section between round and rectangular, and embedded in a planar sheet of insulation material having a dielectric constant and a low dissipation factor; and an insulator jacket extruded over said flat cable, and completely surrounding and in direct contact with said flat cable, said insulator jacket being made of a material having a dielectric constant greater than the dielectric constant of said insulation material, whereby the electrical effect of the composite of the insulation material and the insulator jacket is to establish a balance between the inductive and capacitive coupling coefficients between adjacent signal-carrying conductors thereby minimizing the far-end cross-talk.
Claim 12
Dependent Claim
131 words
A composite multi-signal transmission line cable for transmitting fast rise time electrical pulses with minimum far-end crosstalk comprising: a flat multi-conductor cable including a plurality of generally parallel conductors alternating in cross-section between round and rectangular, and embedded in a planar sheet of insulation material having a dielectric constant and a low dissipation factor; and an insulator jacket extruded over said flat cable, and completely surrounding and in direct contact with said flat cable, said insulator jacket being made of a material having a dielectric constant greater than the dielectric constant of said insulation material, whereby the electrical effect of the composite of the insulation material and the insulator jacket is to establish a balance between the inductive and capacitive coupling coefficients between adjacent signal-carrying conductors thereby minimizing the far-end cross-talk.
Claim 13
Dependent Claim
26 words
A composite multi-signal transmission line cable as in claim 10 wherein the insulation material is made of polyethylene, and the insulator jacket is formed of vinyl.
Claim 14
Dependent Claim
79 words
A composite multi-signal transmission line cable as in claim 10 wherein the characteristic impedance (Zd) of the cable is expressed in the following relationship: Zd (1/ Square Root epsilon ) 42 cosh 1 (1.8 x2 - (1.25x2- 1) ) where d diameter of round conductors; p spacing between a round conductor and an imaginary round conductor falling within the confines of the adjacent flat conductor; x p/d; and epsilon relative dielectric constant of insulation dielectric material to air dielectric.
Claim 15
Dependent Claim
36 words
A composite multi-signal transmission line cable as in claim 10 wherein the thickness of the jacket is approximately two-thirds that thickness of a theoretical cable core capable of confining approximately 98 percent of the TEM field.
Claim 16
Dependent Claim
22 words
A composite multi-signal transmission line cable as in claim 10 wherein the insulator jacket is formed of a material which is self-extinguishing.
Claim 17
Dependent Claim
20 words
A composite multi-signal transmission line cable as in claim 10 wherein the insulator jacket is bonded to the insulation material.
Claim 18
Dependent Claim
36 words
A composite multi-signal transmission line cable as in claim 10 wherein the dissipation factor of the dielectric material of the insulator jacket is greater than the dissipation factor of the insulation material of the flat cable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |