WO1994016451A1 - Cables a couches multiples pour la transmission en temps identique de signaux electriques - Google Patents

Cables a couches multiples pour la transmission en temps identique de signaux electriques Download PDF

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Publication number
WO1994016451A1
WO1994016451A1 PCT/US1993/001585 US9301585W WO9416451A1 WO 1994016451 A1 WO1994016451 A1 WO 1994016451A1 US 9301585 W US9301585 W US 9301585W WO 9416451 A1 WO9416451 A1 WO 9416451A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductors
cable
valence
insulation
signal
Prior art date
Application number
PCT/US1993/001585
Other languages
English (en)
Inventor
Alfredo Cedrone
Roddy M. Bullock
Original Assignee
W.L. Gore & 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 & Associates, Inc. filed Critical W.L. Gore & Associates, Inc.
Publication of WO1994016451A1 publication Critical patent/WO1994016451A1/fr

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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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/20—Cables having a multiplicity of coaxial lines
    • 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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1891—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor comprising auxiliary conductors

Definitions

  • the invention pertains to multivalent shielded electrical signal cables having more than one valence (layer or shell) of insulated and/or shielded electrical conductors arranged inside the cable.
  • a multiplicity of insulated, insulated and shielded, and insulated twisted pair electrical signal conductors are frequently bundled together to form a cable.
  • the multiplicity of conductors are arranged in layers from the center of the cable outwardly, the typical arrangement being one insulated conductor surrounded by a valence or layer of six like (or ' different) conductors, then a layer of about twelve conductors closely fitted around the valence of six conductors. Drain wires may be interspersed in the spaces between the insulated conductors.
  • the insulated conductors are held together by an insulating polymer jacket, usually extruded around the entire bundle as a whole.
  • An electrical shielding material may be wrapped around the bundle of insulated conductors before the jacket is extended around the bundle.
  • a tape binder of paper, polymer, or the like may be used to hold the bundle together in the desired shape before the application of shielding material and/or the jacket to aid in holding the conductors in place while subsequent shielding and/or jacketing processes take place.
  • the present invention proposes to equalize the signal transit time of the conductors within the various valences of a multivalent electrical signal cable by varying appropriately the density of the insulation and hence the dielectric constant and the signal time delay of the signal conductors of the different valences within which the conductors are placed within the cable.
  • the more dense insulation with higher dielectric constant (£ ) is used to insulate conductors in the center of the cable.
  • the valence of conductors surrounding, for example a first valence single signal conductor will have an insulation of lower density and lower dielectric constant, and hence a shorter signal time delay (Td) than the conductor of the first (or inner) valence conductor.
  • the physical length of the second valence conductors will be longer than the first valence conductor and require as shorter signal time delay so that a signal passing through both valences will exit at the same time as the signal being carried by the first valence conductor.
  • the dielectric constant may also be lowered by choosing an insulating material for an outer valence conductor having a different chemical composition which inherently has a lower dielectric constant than that of the insulation of the inner valence of conductors.
  • the cables of the invention preferably have an outside layer of shielding around the conductors as a unit or the cable as a whole and an insulated protective jacket surrounding the shielding.
  • One or more drain wires may be interspersed among the conductors of the cable.
  • the preferred electric signal conductor insulation may be those materials commonly used in the art for that purpose.
  • the shielding material used around individual conductors and around the cable as a whole may be metal foil, metal strands or wires, metal-plated polymer tape and the like.
  • the cable jacketing may be any polymer material commonly used for the purpose, such as rubber, polyethylene, polypropylene, polyester, polyurethane, polyvinyl chloride, fluorinated polymers, including polytetrafluoroethylene, fluorinated ethylene-propylene copolymers, fluorinated ethers of fluorocarbons, and the like.
  • Figure 1 is a perspective view of a spiralled cable of the invention in which an outer valence of insulated conductors having a less dense insulation surrounds an inner valence conductor insulated by a more dense insulation.
  • Figure 2 is a cross-sectional view of a cable of the invention in which a core of insulation is surrounded by an inner valence of six insulated, shielded, and jacketed conductors spiralled around the core which in turn is surrounded by an outer valence of about twelve insulated, shielded, jacketed conductors spiralled around the inner valence of conductors, and the cable as.a whole surrounded by an outer shield and an outer jacket.
  • Figure 3 is a perspective view of a cable of the invention with layers cut away for better viewing of its structure in which a one conductor inner valence of insulated shielded conductor is surrounded by a spiralled middle valence of insulated shielded conductors and the middle valence surrounded by a spiralled outer valence of insulated shielded conductors and an outer cable binder strip, outer cable shielding, and outer cable jacket.
  • the cable of the invention has less dense insulation covering the conductors of the outer valence 5 than covering the inner valence 3_ conductor I.
  • a less dense insulation has a lower dielectric constant, which in turn causes the time delay of the signal transmitted through the conductor covered by the less dense insulation to be smaller than that passed through a conductor covered by the more dense (high dielectric constant) insulation.
  • a drain wire or ground wire is shown in a groove of the spiralled outer valence 7 of insulated conductors.
  • Figure 2 shows in a cross-sectional view of a cable of the invention wherein a multiplicity of shielded insulated conductors is wrapped in a binder tape layer .14 to hold the conductors and a drain wire 6 bundled together for subsequent cabling operations which apply an outer shielding material 1_4_ and then a protective jacket 1J> to the cable.
  • the cable is constructed around an inner core of insulation 18 around which is spiralled an inner valence 17 of six shielded, insulated conductors in which insulation ⁇ is surrounded by shielding 12 and jacket .13. Spiralled around this inner valence 17 of conductors is an outer valence .16 of conductors J_9 which are covered with an insulation 20 of lower density and smaller dielectric constant than that of insulation ⁇ of the inner valence of conductors. Surrounding insulation 20 of the outer valence is shielding 2_1 and jacket 22. The signal transmission speed through the cable is thus arranged to be the same for all conductors by having a more dense insulation on the shorter inner valence 17 conductors than the insulation on the longer outer valence 1_6 conductors.
  • the inner valence 23 is comprised of a single center conductor 20 covered by insulation 2j. and shielding 22. Spiralled around inner valence 23 is an intermediate valence 27 layer of six insulated 2j> and shielded 26 conductors 24 in which the insulation 25 is less dense and has a lower dielectric constant than insulation J. of the inner valence conductor 20.
  • a spiralled outer valence 32 layer of insulated 24 shielded 33 Surrounding the intermediate valence 27 of conductors is a spiralled outer valence 32 layer of insulated 24 shielded 33. conductors 35 which insulation 34 has a lower density and dielectric constant than insulation 25 of the intermediate valence 27. of conductors underlying it.
  • a drain wire 6 is shown in the space between two of the conductors of the outer valence layer 3_7.
  • a shield 41 is placed around the binder 40 covered cable by serving conductive tape or wire strands, braiding tape or wire strands, wrapping a metallized polymer tape spirally or by cigarette wrapping methods around the bound cable.
  • a layer of protective jacket which is usually extruded onto the cable and is formed of a tough environment resistant polymer material, such as polyvinyl chloride, urethane rubber, or fluorocarbon resin, for example.
  • the shielding material may be copper, copper alloys, or aluminum, for example, as may also be the center conductors. Center conductors are often plated with silver, gold, nickel, or tin, for example, to improve their properties.
  • a cable of structure similar to that of Figure 3 is to be manufactured.
  • the cable is to be made up of multiple shielded insulated conductors with the helical pitch or lay to remain constant in each valence.
  • Each shielded insulated conductor is to have a characteristic impedance of fifty ohms using a 28 AWG stranded center conductor and a metal foil shield.
  • the insulation material is expanded polytetrafluoroethylene (ePTFE) of varying densities.
  • ePTFE expanded polytetrafluoroethylene
  • all time delay (Td) numbers are based on a cable construction of physical length 100 feet.
  • the physical length of the inner valence of a single shielded, insulated conductor is the same as the physical length of the cable, 100 feet.
  • the physical length of the intermediate and outer valences is 3% and 8%, respectively, longer than that of the inner valence.
  • the full density base material is polytetrafluoroethylene (PTFE) of a density 2.15 g/cc and an effective dielectric constant of 2.1.
  • PTFE polytetrafluoroethylene
  • the absolute signal time delay for each valence of conductors is equal to that of the other valences within the cable.
  • the preferred expanded polytetrafluoroethylene (ePTFE) one may go as low as an effective dielectric constant of about 1.2 which yields a time delay of about 1.11 nanoseconds/foot.
  • the ePTFE insulation is that material disclosed in U.S. Patents 3,953,566, 3,962,153, 4,096,227, 4,187,390, 4,902,423, and 4,478,665, assigned to W. L. Gore & Associates, Inc., Newark, Delaware, and is a microporous material formed largely of interconnected nodes and fibrils of PTFE of varying sizes and in varying proportions.
  • the major advantage if the invention is the provision of coaxial electrical signal cables of a multiplicity of layers of spiralled insulated shielded signal conductors in which the signals passing through each conductor of the cable transit the conductors at a rate to reach an end of the cable at the same time.

Landscapes

  • Communication Cables (AREA)

Abstract

Un câble coaxial pour la transmission de signaux électriques a des couches multiples successives de conducteurs isolés blindés enroulés en spirale, chaque couche de conducteurs ayant une isolation de densité plus basse (donc avec une constante diélectrique plus basse), une longueur plus importante et un temps plus court pour la transmission du signal que la couche interne suivante de conducteurs, ce qui fait que les signaux pour une longueur données de câble sortent de chaque conducteur au même moment.
PCT/US1993/001585 1993-01-12 1993-02-24 Cables a couches multiples pour la transmission en temps identique de signaux electriques WO1994016451A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US337993A 1993-01-12 1993-01-12
US08/003,379 1993-01-12

Publications (1)

Publication Number Publication Date
WO1994016451A1 true WO1994016451A1 (fr) 1994-07-21

Family

ID=21705597

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/001585 WO1994016451A1 (fr) 1993-01-12 1993-02-24 Cables a couches multiples pour la transmission en temps identique de signaux electriques

Country Status (1)

Country Link
WO (1) WO1994016451A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1103987A1 (fr) * 1999-08-06 2001-05-30 W.L. GORE & ASSOCIATES GmbH Câble enroulé pour un appareil
JP2006032073A (ja) * 2004-07-15 2006-02-02 Hitachi Cable Ltd 細径同軸ケーブル
WO2013125447A1 (fr) * 2012-02-20 2013-08-29 株式会社 潤工社 Câble multiconducteur coaxial
CN103943173A (zh) * 2014-03-17 2014-07-23 安徽红旗电缆集团有限公司 一种航空用多导体绝缘软电缆
CN103943187A (zh) * 2014-03-17 2014-07-23 安徽红旗电缆集团有限公司 一种多导体绝缘软电缆
US20160290876A1 (en) * 2013-12-20 2016-10-06 Leoni Kabel Holding Gmbh Measuring arrangement and temperature-measuring method, and sensor cable for such a measuring arrangement
CN111863406A (zh) * 2020-08-14 2020-10-30 阳光电源股份有限公司 一种线圈绕组、变压器和串并型电力电子装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273080A (en) * 1963-08-06 1966-09-13 Hackethal Draht & Kabelwerk Ag High-frequency transmission line having plural coaxial conductors of different effective length between source and sink
US4552989A (en) * 1984-07-24 1985-11-12 National Electric Control Company Miniature coaxial conductor pair and multi-conductor cable incorporating same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273080A (en) * 1963-08-06 1966-09-13 Hackethal Draht & Kabelwerk Ag High-frequency transmission line having plural coaxial conductors of different effective length between source and sink
US4552989A (en) * 1984-07-24 1985-11-12 National Electric Control Company Miniature coaxial conductor pair and multi-conductor cable incorporating same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1103987A1 (fr) * 1999-08-06 2001-05-30 W.L. GORE & ASSOCIATES GmbH Câble enroulé pour un appareil
JP2006032073A (ja) * 2004-07-15 2006-02-02 Hitachi Cable Ltd 細径同軸ケーブル
WO2013125447A1 (fr) * 2012-02-20 2013-08-29 株式会社 潤工社 Câble multiconducteur coaxial
US20160290876A1 (en) * 2013-12-20 2016-10-06 Leoni Kabel Holding Gmbh Measuring arrangement and temperature-measuring method, and sensor cable for such a measuring arrangement
US10488273B2 (en) * 2013-12-20 2019-11-26 Leoni Kabel Holding Gmbh Measuring arrangement and temperature-measuring method, and sensor cable for such a measuring arrangement
CN103943173A (zh) * 2014-03-17 2014-07-23 安徽红旗电缆集团有限公司 一种航空用多导体绝缘软电缆
CN103943187A (zh) * 2014-03-17 2014-07-23 安徽红旗电缆集团有限公司 一种多导体绝缘软电缆
CN111863406A (zh) * 2020-08-14 2020-10-30 阳光电源股份有限公司 一种线圈绕组、变压器和串并型电力电子装置

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