WO1995005668A1 - Cable acheminant des signaux electriques ayant des caracteristiques de champ egales pour chaque conducteur de signaux - Google Patents

Cable acheminant des signaux electriques ayant des caracteristiques de champ egales pour chaque conducteur de signaux Download PDF

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Publication number
WO1995005668A1
WO1995005668A1 PCT/US1993/009361 US9309361W WO9505668A1 WO 1995005668 A1 WO1995005668 A1 WO 1995005668A1 US 9309361 W US9309361 W US 9309361W WO 9505668 A1 WO9505668 A1 WO 9505668A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulation
core
cable
conductors
signal
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.)
Ceased
Application number
PCT/US1993/009361
Other languages
English (en)
Inventor
Herbert George Van Deusen
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.)
W.L. Gore and Associates Inc
Original Assignee
W.L. 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 W.L. Gore and Associates Inc filed Critical W.L. Gore and Associates Inc
Priority to AU51688/93A priority Critical patent/AU5168893A/en
Publication of WO1995005668A1 publication Critical patent/WO1995005668A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0233—Cables with a predominant gas dielectric
    • 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
    • H01B11/002—Pair constructions

Definitions

  • This invention relates to insulated electric signal cables having a pair of conductors.
  • each center wire ordinarily has differing thickness, differing porosity (if porous), or void content if foamed, and different dielectric constant for each of the two conductors. These differences arise from the way the insulation is made o applied. These differences lead to problems of providing exact or near exact electrical signal transmission properties in the two signal conductors and to problems of matching closely enough the insulation of the two conductors so as to provide a high quality twisted pair cable or parallel pair, useful in modern electronic circuitry.
  • the invention provides a solution to the manufacturing problems outlined above by an insulated electrical signal cable in which the electrical field provided for each signal conductor by the insulation thereof are symmetrical, but not necessarily uniform across the cable cross section.
  • the cable of the invention comprises a pair of electrical signal conductors arranged 180° apart on each side of a generally cylindrical core of insulation having means to hold conductors parallel 180° apart on the periphery of the core along its axis.
  • a layer of the same or different insulation as the insulation comprising the core surrounds the core and the pair of conductors.
  • the electrical field for each signal conductor will be an identical mirror image of each other.
  • An optional, but preferable, layer of electrically conducting shielding surrounds the core, conductors, and insulation layer surrounding them.
  • An optional, but preferable, protective polymeric jacket surrounds the shielding.
  • Figure 1 is a cross-sectional view of a cable of the invention.
  • Figure 2 is a cross-sectional view of a cable of the invention including a layer of conductive shielding and a polymeric jacket.
  • Figure 3 is a perspective cross-sectional view of a cable of the invention with layers partially removed.
  • Figure 4 is a perspective cross-sectional view of a cable of the invention with layers partially removed.
  • Figure 5 is a cross-sectional view of a cable of the invention.
  • Figure 1 is a cross-sectional view of a cable of the invention in which a pair of electrical conductors 1 is held in place 180° apart around the periphery of a generally cylindrical core of insulation 2.
  • the core insulation 2 can be formed by extruding a cylindrical shape or by helically-wrapping tape to form a cylinder or tube, depending on the nature of the insulation.
  • the electrical conductors can be held in place by grooves formed by molding, cutting, burning or impressing the conductors into the core.
  • a layer 3 of insulation is extruded or tape-wrapped around the core of insulation 3 and the pair of conductors.
  • the insulation 2 may be any insulation known in the art for the purpose of insulating electrical signal wires, but is preferably porous to provide a low dielectric constant and most preferably comprises expanded polytetrafluoroethylene (PTFE).
  • PTFE expanded polytetrafluoroethylene
  • the most preferred expanded PTFE is prepared according to U.S. Patents 3,953,566, 3,962,153, 4,096,227, 4,187,390, 4,478,665 and 4,902,423.
  • Wires 1 may be of any conductive material, but usually comprise copper, metal plated copper, copper alloys, aluminum, or steel .
  • Insul tion layer 3 may be any insulation known in the art to be useful for the same purpose as insulation 2, but in the preferred case is the same insulation as insulation 2. Insulation 3 is placed around insulation 2 and its accompanying conductors 1 by extrusion, if insulation 3 is thermoplastic, or by tape-wrapping in a helical or spiral pattern, which is especially useful for expanded PTFE which cannot be extruded in the manner of a thermoplastic.
  • FIG 2 is a cross-sectional view of a cable of the invention in which a core cable, corresponding to Figure 1, has been surrounded by metal foil shield 4 and a protective polymeric jacket 5.
  • Shield 4 is usually spiralled or wound helically around an insulated core cable.
  • Jacket 5 is usually an extruded thermoplastic polymer, such as polyvinyl chloride, a polyolefin, a polyurethane, a rubber, a polyester, or a thermoplastic fluorocarbon resin, or may be a tape-wrapped polymer such as PTFE.
  • Figure 3 is a perspective view of a cable of the invention in which the conductive metal foil shield 4 of Figure 2 comprises alternatively a conductive metal strand or wire braided shield 5. Metal strips may also be used and the wires, strands, or strips may be tightly braided or more loosely braided as shown for illustrative purposes in Figure 3.
  • a protective jacket 6 encloses braided shield 5.
  • Figure 4 is also a perspective view of a cable of the invention of similar structure to that shown in Figure 3, the braided strand shield of that figure being replaced by a shield 7 comprising served conductive metal wires, which may be of the same materials as braided shield 5.
  • FIG. 5 is a cross-sectional view of a cable of the invention in which the shielding layer comprises a metal-coated or laminated polymer tape, the polymer being denoted as 8 and the metal coating as 9.
  • a tape may comprise any customary polymer and metal ordinarily used for the purpose in the art, such as aluminized polyester tape, for example, which is usually spirally or helically applied to the cable core or may be applied longitudinally.
  • the shielding layer may also comprise a conductive polymer material which may be tape-wrapped or extruded onto the cable core. To prevent shorting on any collapse of the core, the conductors may, if desired, contain a thin layer of insulation around each individual conductor.
  • a preferred process for manufacturing a cable of the invention comprises the steps of:
  • the process alternatively includes surrounding the layer of insulation 3 with a conductive shield layer and alternatively surrounding the shield layer with a protective polymer jacket 5 or 6.
  • the method of applying the shield layer to the core may be by tape-wrapping a conductive foil or metallized polymer tape around the core or a conductive polymer shield may be extruded around the core.
  • a conductive wire shielding may be braided or served around insulation 3.
  • the protective jacket layer may be applied by extrusion or by tape-wrapping.
  • the insulation 3 surrounding the core and signal conductors may be extruded of the same material as core 2 if core 2 has been extruded.
  • the signal conductors of the cable of the invention advantageously each share a common insulation system such that the insulation between signal and ground is essentially the same for each signal conductor.
  • This structure and process of preparing it thus eliminates the effects of varying dielectric constants associated with the variations in thickness and densities of various porous dielectric systems.
  • a cable of the invention was made by wrapping a tape of expanded porous PTFE to form a cylindrical core shape about 1/3000 of an inch, and conductors of silver plated copper were placed 180° apart along the cylindrical core and impressed into the core by the force of a tape of expanded PTFE as it was helically-wrapped around the assembly.
  • Typical delay skew are about 2 percent for individually wrapped conductor pairs wrapped with expanded PTFE, but on the construction of this invention the skew as less than 0.1 percent and frequently less than 0.025 percent.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Abstract

L'invention concerne un câble électrique isolé acheminant des signaux qui crée un champ électrique par son isolation pour chaque conducteur de signaux, ce champ électrique étant symétrique, mais pas nécessairement uniforme dans la section transversale du câble. Le câble comprend une paire de conducteurs de signaux électriques espacés de 180° de chaque côté d'une âme généralement cylindrique de l'isolation et possède des éléments pour maintenir les conducteurs parallèles espacés de 180° sur la périphérie de l'âme le long de son axe, et une couche de matière isolante, identique ou différente de la matière isolante constituant l'âme, entoure l'âme et la paire de conducteurs.
PCT/US1993/009361 1993-08-16 1993-10-07 Cable acheminant des signaux electriques ayant des caracteristiques de champ egales pour chaque conducteur de signaux Ceased WO1995005668A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU51688/93A AU5168893A (en) 1993-08-16 1993-10-07 Signal cable having equal field characteristics for each signal conductor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10801293A 1993-08-16 1993-08-16
US08/108,012 1993-08-16

Publications (1)

Publication Number Publication Date
WO1995005668A1 true WO1995005668A1 (fr) 1995-02-23

Family

ID=22319765

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/009361 Ceased WO1995005668A1 (fr) 1993-08-16 1993-10-07 Cable acheminant des signaux electriques ayant des caracteristiques de champ egales pour chaque conducteur de signaux

Country Status (2)

Country Link
AU (1) AU5168893A (fr)
WO (1) WO1995005668A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753561A1 (fr) * 1996-09-18 1998-03-20 Telecommunications Sa Ligne de transmission pour signaux a haute frequence
CN102751026A (zh) * 2012-07-20 2012-10-24 安徽江淮电缆集团有限公司 一种绿色环保数字对称电缆
EP3637440A1 (fr) * 2018-10-11 2020-04-15 Aptiv Technologies Limited Câble de communication d'automobile
DE102022109844A1 (de) 2022-04-25 2023-10-26 HELLA GmbH & Co. KGaA Mehradrige Leitung zum Anschluss eines elektrischen Gerätes, insbesondere in einem Kraftfahrzeug, zum Beispiel zum Anschließen eines Scheinwerfers
US12014847B2 (en) 2021-12-03 2024-06-18 Aptiv Technologies AG Cable for connecting system components

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500678A1 (fr) * 1981-02-20 1982-08-27 Lignes Telegraph Telephon Cable, notamment cable mixte, comprenant au moins une paire symetrique
SU993337A1 (ru) * 1981-01-14 1983-01-30 Куйбышевский электротехнический институт связи Симметричный кабель св зи
EP0296692A2 (fr) * 1987-06-22 1988-12-28 W.L. Gore & Associates, Inc. Câble électrique multiconducteur à performance électrique contrôlée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU993337A1 (ru) * 1981-01-14 1983-01-30 Куйбышевский электротехнический институт связи Симметричный кабель св зи
FR2500678A1 (fr) * 1981-02-20 1982-08-27 Lignes Telegraph Telephon Cable, notamment cable mixte, comprenant au moins une paire symetrique
EP0296692A2 (fr) * 1987-06-22 1988-12-28 W.L. Gore & Associates, Inc. Câble électrique multiconducteur à performance électrique contrôlée

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753561A1 (fr) * 1996-09-18 1998-03-20 Telecommunications Sa Ligne de transmission pour signaux a haute frequence
CN102751026A (zh) * 2012-07-20 2012-10-24 安徽江淮电缆集团有限公司 一种绿色环保数字对称电缆
EP3637440A1 (fr) * 2018-10-11 2020-04-15 Aptiv Technologies Limited Câble de communication d'automobile
JP2020077622A (ja) * 2018-10-11 2020-05-21 アプティブ・テクノロジーズ・リミテッド 自動車用通信ケーブル
US12014847B2 (en) 2021-12-03 2024-06-18 Aptiv Technologies AG Cable for connecting system components
DE102022109844A1 (de) 2022-04-25 2023-10-26 HELLA GmbH & Co. KGaA Mehradrige Leitung zum Anschluss eines elektrischen Gerätes, insbesondere in einem Kraftfahrzeug, zum Beispiel zum Anschließen eines Scheinwerfers

Also Published As

Publication number Publication date
AU5168893A (en) 1995-03-14

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