EP0635850B1 - Câble électrique coaxial utilisable à haute fréquence et à large bande - Google Patents

Câble électrique coaxial utilisable à haute fréquence et à large bande Download PDF

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Publication number
EP0635850B1
EP0635850B1 EP94111427A EP94111427A EP0635850B1 EP 0635850 B1 EP0635850 B1 EP 0635850B1 EP 94111427 A EP94111427 A EP 94111427A EP 94111427 A EP94111427 A EP 94111427A EP 0635850 B1 EP0635850 B1 EP 0635850B1
Authority
EP
European Patent Office
Prior art keywords
coaxial cable
conductor
wound
cable
round
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
EP94111427A
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German (de)
English (en)
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EP0635850A1 (fr
Inventor
Konrad Buckel
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 GmbH
Original Assignee
WL Gore and Associates GmbH
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 GmbH filed Critical WL Gore and Associates GmbH
Publication of EP0635850A1 publication Critical patent/EP0635850A1/fr
Application granted granted Critical
Publication of EP0635850B1 publication Critical patent/EP0635850B1/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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors

Definitions

  • the invention relates to a broadband radio frequency-compatible electrical coaxial cable according to the preamble of claim 1.
  • Such a coaxial cable is known from EP-A-0 504 776.
  • Low signal attenuation is desirable in order to be able to transmit signals over the longest possible distances with one cable.
  • a high return loss means that the wave impedance of the cable is as constant as possible over its length. Wave resistance changes along the cable lead to disturbing signal reflections and thus signal reflux.
  • the inner conductor and outer conductor of the cable would have to have a certain minimum cross-section if one considers the lower frequency range.
  • the skin effect has an increasing effect with increasing frequency.
  • the dielectric between the inner conductor and the outer conductor in particular its dielectric constant and its dielectric loss factor.
  • a solid copper pipe leads to a cable that is practically inflexible and that is not drum-ready, i.e. that cannot be wound on cable drums.
  • the known coaxial cable according to the preamble of claim 1 according to EP-A-0 504 776 has an inner conductor made of a single layer, which is formed by the helically wound electrically conductive foil (copper tape).
  • an underwater coaxial cable in which a round conductor stranded composite is arranged on a thin nylon carrier as the inner conductor and carries an insulating layer made of polypropylene. On this insulating layer there is a copper round cable strand, wrapped with a copper mylar tape. On this coaxial cable there is a reinforcement arrangement consisting of an insulating layer, a first and a second steel wire stranded composite and an outer jacket, as viewed from the outside of the copper-Mylar tape.
  • a coaxial cable is known from JP-A-12 32 611, in which a metal-plastic strip is wound on the insulating material surrounding the inner conductor to suppress external interference, the metallic coating of which is connected to the outer conductor.
  • a coaxial cable is known from FR-A-92 82 87, in which both the inner conductor and the outer conductor consist of a wound metal jacket.
  • the object of the invention is to make available a low-loss coaxial cable which leads to the best possible compromise with regard to the three aspects of electrical properties, mechanical properties and production costs.
  • Both the helical winding of an electrically conductive film on a plastic core and the stranding of stranded conductors on a round core are manufacturing processes which, compared to the braiding of round or flat conductors on a core, are considerably faster, use simpler machines and require less preparation for setting up the machines.
  • the inner layer of its inner conductor consists of a silver-plated copper foil on which there is a stranded connection of silver-plated round copper wires.
  • the plastic core of the inner conductor can be formed by hollow FEP (fluoroethylene propylene).
  • the dielectric between the inner conductor and outer conductor is preferably made of microporous PTFE (polytetrafluoroethylene).
  • the embodiment of a coaxial cable shown in the figure extends from the inside to the outside: a plastic core 1, a silver-plated copper foil 2 wound on the plastic core, a round conductor stranded association made of silver-plated round copper wires applied to the copper foil 2, a dielectric 4, a shield construction 5 as an outer conductor and a plastic sheath 6.
  • the plastic core 1, the copper foil 2 and the round conductor strand assembly 3 form the inner conductor construction of this coaxial cable.
  • the signal attenuation depends, inter alia, on the characteristic impedance, the outer diameter of the inner conductor and the inner diameter of the outer conductor of the coaxial cable. If you want to achieve the same signal attenuation with the cable according to the invention as with a known coaxial cable with a copper tube as the inner conductor, with otherwise the same cable construction, you have to achieve the same characteristic impedance and the same outer diameter of the inner conductor construction.
  • the reason for this is that such a round conductor stranding leads to a considerable increase in the inductance of the inner conductor and thus of the cable, which, according to equation (2), leads to a considerable change in the characteristic impedance.
  • the characteristic impedance which is usually specified as the nominal value, which must be adhered to as well as possible in order to avoid signal reflections in the entire system comprising the coaxial cable, must not be changed.
  • the solution to this problem according to the invention is to underlay the round conductor strand assembly 3 with the helically overlapping wound copper foil 2, with electrical contact between the copper foil 2 and the round conductor strand assembly 3. In this way, the inductance of the round conductor strand assembly 3 is short-circuited and thus switched off. This results in an overall inductance L. like a coaxial cable with a solid copper tube as inner conductor with otherwise the same cable structure.

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  • Communication Cables (AREA)

Claims (9)

  1. Câble électrique coaxial utilisable en haute fréquence et à large bande, comprenant,
    - un conducteur intérieur cylindrique (2 , 3) disposé sur un noyau de matière plastique (1) et comportant une feuille électriquement conductrice (2) enroulée en chevauchement selon une disposition hélicoïdale,
    - un conducteur extérieur (5) concentrique au conducteur intérieur, et
    - un diélectrique (4) situé entre le conducteur intérieur (2, 3) et le conducteur extérieur (5),
    caractérisé en ce
    que le conducteur intérieur (2, 3) comporte un agencement à deux couches comprenant une couche intérieure sous la forme d'une feuille enroulée (2) et une couche extérieure placée en contact électrique avec la couche intérieure et se présentant sous la forme d'un ensemble composite (3) de conducteurs circulaires toronnés.
  2. Câble coaxial selon la revendication 1, caractérisé en ce que la couche intérieure (2) est formée d'une couche de cuivre enroulée.
  3. Câble coaxial selon la revendication 1 ou 2, caractérisé en ce que la couche intérieure (2) est formée d'une feuille argentée enroulée.
  4. Câble coaxial selon l'une des revendications 1 à 3, caractérisé en ce que la couche extérieure (3) est formée avec des fils de cuivre toronnés.
  5. Câble coaxial selon l'une des revendications 1 à 4, caractérisé en ce que la couche extérieure (3) est formée avec des conducteurs cylindriques argentés.
  6. Câble coaxial selon l'une des revendications 1 à 5, caractérisé en ce que le noyau en matière plastique (1) est constitué par du FEP (éthylène-propylène fluoré).
  7. Câble coaxial selon l'une des revendications 1 à 6, caractérisé en ce que le noyau de matière plastique (1) est creux.
  8. Câble coaxial selon l'une des revendications 1 à 7, caractérisé en ce que le conducteur extérieur (5) est enveloppé par une gaine en matière plastique (6).
  9. Câble coaxial selon l'une des revendications 1 à 8, caractérisé en ce que le diélectrique (4) est formé de PTFE microporeux (polytétrafluoroéthylène).
EP94111427A 1993-07-22 1994-07-21 Câble électrique coaxial utilisable à haute fréquence et à large bande Expired - Lifetime EP0635850B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9310993U 1993-07-22
DE9310993U DE9310993U1 (de) 1993-07-22 1993-07-22 Breitband-Hochfrequenz-taugliches elektrisches Koaxialkabel
US08/278,731 US5500488A (en) 1993-07-22 1994-07-21 Wide band high frequency compatible electrical coaxial cable

Publications (2)

Publication Number Publication Date
EP0635850A1 EP0635850A1 (fr) 1995-01-25
EP0635850B1 true EP0635850B1 (fr) 1997-09-10

Family

ID=25961048

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111427A Expired - Lifetime EP0635850B1 (fr) 1993-07-22 1994-07-21 Câble électrique coaxial utilisable à haute fréquence et à large bande

Country Status (4)

Country Link
US (1) US5500488A (fr)
EP (1) EP0635850B1 (fr)
JP (1) JPH07141927A (fr)
DE (1) DE9310993U1 (fr)

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FR2746539B1 (fr) * 1996-03-21 1998-05-22 Kertscher Sa E Procede de fabrication de cables coaxiaux
ATE306714T1 (de) 1997-08-14 2005-10-15 Commscope Inc Koaxialkabel und sein herstellungsverfahren
US6288328B1 (en) * 1999-03-19 2001-09-11 Avaya Technology Corp. Coaxial cable having effective insulated conductor rotation
DE19948566A1 (de) * 1999-10-08 2001-04-19 Alcatel Sa Kabel zur Leistungsübertragung
US6915147B2 (en) * 2001-09-07 2005-07-05 Medtronic Minimed, Inc. Sensing apparatus and process
US20040089462A1 (en) * 2002-11-12 2004-05-13 Konrad Buckel Wide band high frequency compatible electrical coaxial cable
US6756538B1 (en) * 2003-01-29 2004-06-29 Conductores Monterrey S.A. De C.V. Coaxial cable having improved mechanical and electrical properties
ES2310378T3 (es) * 2006-02-02 2009-01-01 W.L.GORE & ASSOCIATES GMBH Antena coaxial emisora.
US20070221402A1 (en) * 2006-03-22 2007-09-27 Alex Huang Soft wire bank joint device
DE102007050402B3 (de) * 2007-10-19 2009-06-04 Geo. Gleistein & Sohn Gmbh Seil mit darin aufgenommenem elektrischen Leiter
US7622678B2 (en) * 2007-12-14 2009-11-24 Commscope Inc. Of North Carolina Coaxial cable including tubular bimetallic outer layer with folded edge portions and associated methods
US7687718B2 (en) * 2007-12-14 2010-03-30 Commscope Inc. Of North Carolina Coaxial cable including tubular bimetallic outer layer with bevelled edge joint and associated methods
US7687717B2 (en) 2007-12-14 2010-03-30 Commscope Inc. Of North Carolina Coaxial cable including tubular bimetallic inner layer with bevelled edge joint and associated methods
US7569766B2 (en) * 2007-12-14 2009-08-04 Commscope, Inc. Of North America Coaxial cable including tubular bimetallic inner layer with angled edges and associated methods
US7569767B2 (en) * 2007-12-14 2009-08-04 Commscope, Inc. Of North Carolina Coaxial cable including tubular bimetallic inner layer with folded edge portions and associated methods
US7687719B2 (en) 2007-12-14 2010-03-30 Commscope Inc. Of North Carolina Coaxial cable including tubular bimetallic outer layer with angled edges and associated methods
US8099254B2 (en) * 2008-01-11 2012-01-17 Minnesota Wire and Cable Elastomeric conductor and shield fault detection
FR2990791B1 (fr) * 2012-05-16 2015-10-23 Nexans Cable de transmission electrique a haute tension
US10764541B2 (en) 2014-12-15 2020-09-01 SeeScan, Inc. Coaxial video push-cables for use in inspection systems
EP3494263A2 (fr) * 2016-08-07 2019-06-12 SeeScan, Inc. Appareil alimenté en courant alternatif haute fréquence et procédés de nettoyage et d'inspection de tuyaux d'évacuation
DE102019112742A1 (de) * 2019-05-15 2020-11-19 Leoni Kabel Gmbh Koaxialleitung
TWI764667B (zh) * 2021-04-13 2022-05-11 温芫鋐 自行車用導線
US11674245B2 (en) * 2021-06-22 2023-06-13 Apple Inc. Braided electronic device cable, braiding machine and method for braiding an electronic device cable

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Also Published As

Publication number Publication date
DE9310993U1 (de) 1994-11-17
EP0635850A1 (fr) 1995-01-25
JPH07141927A (ja) 1995-06-02
US5500488A (en) 1996-03-19

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