EP0243023B1 - Câble pour ligne de transmission - Google Patents

Câble pour ligne de transmission Download PDF

Info

Publication number
EP0243023B1
EP0243023B1 EP87302894A EP87302894A EP0243023B1 EP 0243023 B1 EP0243023 B1 EP 0243023B1 EP 87302894 A EP87302894 A EP 87302894A EP 87302894 A EP87302894 A EP 87302894A EP 0243023 B1 EP0243023 B1 EP 0243023B1
Authority
EP
European Patent Office
Prior art keywords
primary conductor
wrapped
diameter
wire
transmission wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87302894A
Other languages
German (de)
English (en)
Other versions
EP0243023A2 (fr
EP0243023A3 (en
Inventor
Paul Everett Hubis
James George Vana
Stephen Charles Miller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Priority to AT87302894T priority Critical patent/ATE73256T1/de
Publication of EP0243023A2 publication Critical patent/EP0243023A2/fr
Publication of EP0243023A3 publication Critical patent/EP0243023A3/en
Application granted granted Critical
Publication of EP0243023B1 publication Critical patent/EP0243023B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores

Definitions

  • This invention relates to an electric transmission wire including a primary conductor wherein the characteristic impedance along the length of the wire is low, yet the wire is capable of being terminated using standard termination equipment.
  • This invention is particularly useful for solderless wrap connections to printed circuit boards or panels and for twisted wire and single wire interconnections.
  • transmission wire with a low impedance (less than 100 ohms) was not available for use with standard termination equipment.
  • a primary conductor with a diameter greater than 0.508mm had to be selected in order to achieve a low characteristic impedance. Only a thin wall of insulation could be wrapped around the primary conductor without increasing the characteristic impedance. Since only a thin wall of insulation could be used, there was a poor cut-through resistance of this outer wall of insulation and there were other stripping difficulties.
  • GB-A-1151842 discloses a conductor wrapped with a low resistivity tape.
  • the purpose of the tape is to attenuate high frequency currents and no insulating layer is required.
  • the effect of the tape on the characteristic impedance of the cable would be negligible.
  • an electric transmission wire comprising a primary conductor with a diameter of less than 20 mils (0.508mm) wrapped with at least one layer of material characterised in that the material of the at least one layer comprises a conductive layer in continuous contact with the primary conductor, said primary conductor and wrapped conductive layer further wrapped with at least one layer of an insulating film such that the overall transmission wire maintains a characteristic impedance below 100 ohms.
  • the layer of conductive material which can be conductive foil or a conductive foil laminated to a substrate layer, is in contact with the primary conductor, the effective electrical diameter of the primary conductor is increased.
  • An outer layer of insulation may be applied over the foil and primary conductor.
  • the foil or foil laminate may be applied by either spiral wrapping or by longitudinal wrapping around the primary conductor. This invention provides a desired characteristic impedance along the length of the wire and allows easy removal for standard termination and increased cut-through resistance.
  • the effective electrical diameter of a primary conductor of less than 0.508mm diameter is increased by wrapping conductive foil, or conductive foil laminated to a substrate on to the primary conductor, the foil being in contact with the conductor. This may be accomplished by conventional wire wrapping techniques and equipment.
  • the primary conductor with conductive foil or laminate in contact with it is able to maintain a low characteristic impedance and still be compatible with standard termination equipment and printed circuit boards.
  • a thicker layer of outer insulation may be applied over the wrapped primary conductor and will not affect the characteristic impedance. This provides increased cut-through resistance. Conventional stripping equipment may be used with the wrapped wire and the thicker layer of outer insulation is easily removed for termination.
  • the invention also provides benefits for applications in state of the art electronic equipment.
  • the primary conductor with a diameter of less than 0.508mm is compatible with terminal and grid spacings of a printed circuit board having 0.16 cm2 terminal with grid spacing of 0.254cm.
  • An inventive embodiment may be used either as a single insulated wire or two insulated wires may be twisted together and be used as a pair of twisted wires.
  • a conductive metal foil laminate consisting of a metal foil coating 2 on a laminar support 1 is spirally wrapped around a primary conductor 3 with the metal foil 2 facing into and in continuous contact with the primary conductor 3 and making electrical contact between the primary conductor 3 and foil 2.
  • the preferred metal foil laminate comprises aluminum foil bonded to polyester or polyimide base film 1 or aluminum foil bonded to a film of expanded polytetrafluoroethylene 1.
  • the primary conductor 3 may have a single wrapping of metal foil or it may have a plurality of wrappings, depending on the desired thickness of the wall, as depicted in Figure 1. Additional insulation 4, if required, is applied over the top of the metal foil laminate wrapping.
  • Figure 2 shows a cross-sectional view of a twisted pair of insulated wires in which a conductive metal foil laminate, consisting of metal foil 12 on a laminar support 10, is spirally wrapped around each primary conductor 13 with the metal foil 12 facing the wires and in continuous contact with primary conductors 13 making electrical contact between the primary conductors 13 and the foil 12. Additional insulation 14, if required, is applied over the top of the metal foil laminate wrapping.
  • a conductive metal foil laminate consisting of metal foil 12 on a laminar support 10
  • Figure 2 also shows the initial diameter of the primary conductor 13 as being d1.
  • the effective electrical diameter is increased and is measured as d eff .
  • the primary conductor actual diameter d1 is also its effective electrical diameter.
  • Additional insulation 14 may be applied over the top of the metal foil laminate wrapping.
  • the total diameter of the conductor 13, wrapped conductive foil 12, support 10 and outer insulation covering 14 is measured as D.
  • the characteristic impedance Z is logarithmically related to the diameter of the insulated wire by the ratio D/d. Where the invention is used, the diameter of the primary conductor (d) is substituted by d eff . Thus, by using the invention, the characteristic impedance is reduced because the effective electrical diameter of the primary conductor is increased.
  • the additional insulation 14 may be a polyester film or polyimide based film insulation. This additional insulation may be applied by extrusion or by additional wrapping to a desired outside diameter. Cut-through resistance is increased by the addition of this insulation.
  • a single 28(l) AWG primary conductor of actual diameter 0.32mm was wrapped with three layers of aluminum foil laminated tape whereby the foil was in constant physical contact with the primary conductor.
  • An outer layer of polyester film insulation was applied over the primary conductor foil combination.
  • the final diameter of this embodiment was 19.6 mils 0.498mm.
  • the diameter of the primary conductor of 0.32mm was increased to an effective electrical diameter of 0.445mm.
  • the characteristic impedance was maintained at 50 ohms and the resulting wire had a calculated D/d ratio of 1.13.
  • An insulated wire with an outer wall thickness of 0.019mm does not fit standard automated stripping machines.
  • the standard wire cutting equipment is not able to cut into, grab and pull off the outer wrapping without injury to the primary conductor. Further, a radius of curvature of 0.179mm does not meet conventional wire cut-through requirements.
  • the present invention provides a primary conductor with an increased electrical diameter and increased outer wall diameter and cut-through radius of curvature so that standard automated stripping machines could be used.
  • Test data was accumulated and calculations made were similar to those as described in Example 1. Test results are summarised in Chart 2 shown below.
  • the inventive entity allows the impedance to remain at 55 ohms but the outer wall and cut-through radius are increased (by 39%) and can be used with existing wire stripping equipment.
  • a pair of 30(l) AWG primary conductors are individually wrapped with aluminum foil laminated tape so that the foil is in constant physical contact with each primary conductor.
  • the outer diameter D is 0.495mm
  • the effective electrical diameter d eff is 0.366mm
  • the ratio of D/d eff is found to be 1.31.
  • the wall thickness has been increased to add cut-through resistance without increasing the characteristic impedance in this invention. Further, the cut-through radius of curvature is increased by 43% and is easily compatible with existing stripping equipment.

Landscapes

  • Communication Cables (AREA)
  • Detergent Compositions (AREA)
  • Non-Insulated Conductors (AREA)
  • Insulated Conductors (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Vehicle Body Suspensions (AREA)
  • Near-Field Transmission Systems (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Claims (8)

  1. Fil de transmission électrique comprenant un conducteur primaire (3) ayant un diamètre inférieur à 0,508 mm enveloppé d'au moins une couche (2), caractérisé en ce que la matière de ladite couche au moins comprend une couche conductrice qui est en contact continu avec le conducteur primaire, le conducteur primaire et la couche conductrice enveloppée étant en outre enveloppés d'au moins une couche d'un film isolant (4) afin que le fil de transmission dans son ensemble garde une impédance caractéristique inférieure à 100 Ω.
  2. Fil de transmission électrique selon la revendication 1, caractérisé en ce qu'il est retordu avec un second conducteur primaire ayant un diamètre inférieur à 0,508 mm enveloppé d'une couche conductrice en contact continu avec lui et enveloppé en outre d'au moins une couche d'un film isolant.
  3. Fil de transmission électrique selon la revendication 1, caractérisé en ce que le fil garde une impédance caractéristique inférieure à 75 Ω.
  4. Fil de transmission électrique selon la revendication 1, caractérisé en ce que la couche ou chaque couche conductrice enveloppée est formée d'un stratifié d'aluminium sur un film de polyester.
  5. Fil de transmission électrique selon la revendication 1, caractérisé en ce que la couche ou chaque couche conductrice enveloppée est formée d'un stratifié d'aluminium sur un film de PTFE expansé.
  6. Fil de transmission électrique selon la revendication 1, caractérisé en ce que la couche ou chaque couche conductrice enveloppée est un stratifié d'aluminium sur un film de polyimide.
  7. Fil de transmission électrique selon la revendication 1, caractérisé en ce que la couche ou chaque couche conductrice enveloppée est enroulée en spirale autour du conducteur primaire.
  8. Fil de transmission électrique selon la revendication 1, caractérisé en ce que la couche ou chaque couche conductrice enveloppée est enroulée longitudinalement autour du conducteur primaire.
EP87302894A 1986-04-07 1987-04-02 Câble pour ligne de transmission Expired - Lifetime EP0243023B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87302894T ATE73256T1 (de) 1986-04-07 1987-04-02 Kabel fuer transmissionsleitung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84888186A 1986-04-07 1986-04-07
US848881 1986-04-07

Publications (3)

Publication Number Publication Date
EP0243023A2 EP0243023A2 (fr) 1987-10-28
EP0243023A3 EP0243023A3 (en) 1988-07-20
EP0243023B1 true EP0243023B1 (fr) 1992-03-04

Family

ID=25304532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87302894A Expired - Lifetime EP0243023B1 (fr) 1986-04-07 1987-04-02 Câble pour ligne de transmission

Country Status (12)

Country Link
EP (1) EP0243023B1 (fr)
JP (1) JPS63119112A (fr)
AT (1) ATE73256T1 (fr)
AU (1) AU7052487A (fr)
CA (1) CA1277731C (fr)
DE (1) DE3776949D1 (fr)
DK (1) DK177887A (fr)
FI (1) FI871483A7 (fr)
GB (1) GB2188768B (fr)
NO (1) NO871432L (fr)
PT (1) PT84630B (fr)
ZA (1) ZA872487B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH074411A (ja) * 1993-06-16 1995-01-10 Toyoda Gosei Co Ltd 合成樹脂製ファスナー

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151842A (en) * 1966-01-12 1969-05-14 Donald Francis Binns Improvements in Electrical Conductors.
US3412199A (en) * 1967-01-12 1968-11-19 Research Corp Electric power transmission cable
JPS6011401B2 (ja) * 1977-02-09 1985-03-26 松下電器産業株式会社 銅箔糸線
US4414428A (en) * 1979-05-29 1983-11-08 Teledyne Industries, Inc. Expanded metal containing wires and filaments

Also Published As

Publication number Publication date
DK177887A (da) 1987-10-08
JPS63119112A (ja) 1988-05-23
EP0243023A2 (fr) 1987-10-28
GB2188768B (en) 1990-01-24
AU7052487A (en) 1987-10-08
DE3776949D1 (de) 1992-04-09
FI871483L (fi) 1987-10-08
JPH0456408B2 (fr) 1992-09-08
CA1277731C (fr) 1990-12-11
GB8707921D0 (en) 1987-05-07
GB2188768A (en) 1987-10-07
FI871483A0 (fi) 1987-04-06
DK177887D0 (da) 1987-04-07
ZA872487B (en) 1988-03-30
PT84630B (pt) 1989-11-30
PT84630A (fr) 1987-05-01
ATE73256T1 (de) 1992-03-15
NO871432D0 (no) 1987-04-06
EP0243023A3 (en) 1988-07-20
NO871432L (no) 1987-10-08
FI871483A7 (fi) 1987-10-08

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