EP1047084B1 - Câble coaxial à haute fréquence - Google Patents

Câble coaxial à haute fréquence Download PDF

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Publication number
EP1047084B1
EP1047084B1 EP00106427A EP00106427A EP1047084B1 EP 1047084 B1 EP1047084 B1 EP 1047084B1 EP 00106427 A EP00106427 A EP 00106427A EP 00106427 A EP00106427 A EP 00106427A EP 1047084 B1 EP1047084 B1 EP 1047084B1
Authority
EP
European Patent Office
Prior art keywords
layer
cable according
cable
fluoropolymer
following
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
EP00106427A
Other languages
German (de)
English (en)
Other versions
EP1047084A2 (fr
EP1047084A3 (fr
Inventor
Wolfgang Dlugas
Henning Hansen
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.)
HEW Kabel CDT GmbH and Co KG
Original Assignee
HEW Kabel CDT GmbH and Co KG
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 HEW Kabel CDT GmbH and Co KG filed Critical HEW Kabel CDT GmbH and Co KG
Publication of EP1047084A2 publication Critical patent/EP1047084A2/fr
Publication of EP1047084A3 publication Critical patent/EP1047084A3/fr
Application granted granted Critical
Publication of EP1047084B1 publication Critical patent/EP1047084B1/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
    • H01B11/1834—Construction of the insulation between the conductors
    • H01B11/1839—Construction of the insulation between the conductors of cellular structure

Definitions

  • the present invention relates to a flexible coaxial high-frequency cable with a surrounding the central conductor multilayer insulation of polymeric materials and with an insulation enclosing electrical shield, which is covered by an outer sheath.
  • Cables of the generic type are well known, they find in high-frequency technology for the transmission of analog and digital signals general application.
  • the insulation surrounding the central conductor consists of two layers which differ in the dielectric constant.
  • the dielectric constant of the second layer is greater than that of the first layer, wherein the first layer is formed by a polyethylene and the second layer by a polyimide.
  • Out JP 08031242 is a semi-solid label known, with a central conductor surrounding the first layer of fluoropolymer and a second layer of polytetrafluoroethylene.
  • the invention has the object to find a way to further improve the transmission characteristics of such micro-coaxial cable despite the required small external dimensions, in particular to reduce the capacity of the transmission path to a minimum.
  • melt processible, i. extrudable fluoropolymers are e.g. the tetrafluoroethylene / hexafluoropropylene copolymer (FEP), the tetrafluoroethylene-perfluoroalkylvenyl ether copolymer (TFA / PFA) or a fluoropolymer sold under the tradename HYFLON MFA.
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • TFA / PFA tetrafluoroethylene-perfluoroalkylvenyl ether copolymer
  • HYFLON MFA a fluoropolymer sold under the tradename HYFLON MFA.
  • This first layer can be compact but also foamed.
  • the wall thicknesses of this first layer expediently amount to between 0.8 and 0.1 mm, preferably between 0.3 and 0.2 mm, depending on the intended use of the cable
  • the first subsequent second insulating layer is formed porous, also known as microporous structure (EP 0489 752 B1 ).
  • the wall thickness of this layer is approximately between 0.8 and 0.2, preferably between 0.4 and 0.3 mm. It is advantageous if the dielectric constant of the first layer is greater than that of the second layer.
  • tapes films
  • such a strip is stretched and sintered to ensure the porous nature of the tape. It depends on the microporosity of the strip material.
  • a stretching process with a stretching rate up to 2000%, preferably between 300 and 1000% , subject. The stretching is usually done in the tape direction, but it can also be made transversely thereto, for example, when the porosity of the tape or the film is to be increased. By a simultaneously occurring with the stretching process or the stretching process downstream sintering process, the mechanical strength of the tape or film material is increased.
  • the thickness of the stretched and advantageously also sintered strip or the corresponding foil is then 15 to 250 ⁇ m, preferably 30 to 100 ⁇ m.
  • At least the outermost band layer is positively connected to the surface facing the electrical shielding.
  • This can be achieved, for example, by using a wound-on, hot-melt adhesive applied to the band winder for frictional connection between a conductive plastic or metal foil, or in a continuation of the invention in that an adhesive-coated metal foil serves as electrical shielding.
  • the frictional connection between the porous outermost layer of the insulation and the conductive shield is usually carried out when extruding the outer jacket of the cable by its heat content. This is especially true if, as also provided according to the invention, the outer sheath of a fluoropolymer with a correspondingly high melting / extrusion temperature of z. B. 350 ° C consists. Such temperatures in the outer region of the cable lead to a melting of the adhesive layer between the porous insulation and electrical shielding, the adhesive then passes through the pores z. B. at least the uppermost layer of a winding of a stretched film, which serves as a second layer of cable insulation.
  • the shielding is firmly anchored to the cable insulation by a plurality of adhesive points.
  • This anchoring is permanent, this also applies to high temperature fluctuations or corresponding operating temperatures, as well as under mechanical stress. Creasing or rupture of, for example, a thin aluminum foil, which would inevitably lead to a deterioration in the electrical transmission properties, is thus ruled out.
  • This also applies to the so-called micro-coaxial cable for the transmission of analog and digital signals with correspondingly small external dimensions
  • the heat content of the extruded outer sheath is not sufficient for a secure connection between porous insulation and shielding, for example because of too low an extruded mass per unit length or as a lower sheath polymer material with a lower melting / extrusion temperature, then an additional heat treatment is recommended Apply the electrical shield.
  • an essential feature of the coaxial cable according to the invention is the mechanically strong all-surface composite between z. B. a metal foil and the outermost porous insulating layer of the cable.
  • the shield of the cable is advantageously formed in two layers. Above the described adhesive-coated metal foil or else a metallized plastic foil, an outer layer in the form of a metal wire layer or a braid of individual metal wires is provided. Above this, the outer sheath is based on fluoropolymers or halogen-free, flame-retardant or flame retardant, anticorrosive polymeric materials, such as polyolefins, elastomers or thermoplastic rubber.
  • the two-layer shield has the advantage of an improved shielding effect with high flexibility of the cable.
  • FIG. 1 shows an example of the cable according to the invention in cross section
  • FIG. 2 shows the same cable in longitudinal section.
  • a solid copper wire is provided, advantageously tinned or silvered.
  • the diameter of the central conductor is about 0.254 mm.
  • the central conductor 1 is enclosed by the inner or first layer 2, here of a melt-processable, i.e. extruded fluoropolymer, e.g. from a tetrafluoroethylene / hexafluoropropylene copolymer (FEP).
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • It consists of a winding in a thickness of, for example, 0.3 mm of several layers of a polytetrafluoroethylene produced by paste extrusion and subsequent rolling, which is stretched after being rolled out and a temperature treatment for the purpose has been subjected to sintering.
  • the pores in the belt produced by the stretching process serve in the winding as air chambers to reduce the dielectric constant and to improve the electrical transmission properties, the open pores located in the outermost layer of the belt wound serve for the anchoring of the aluminum foil 4 coated with polyester or another adhesive over the whole surface.
  • the second layer of the shield is called, this is a layer / braid of tinned copper wires.
  • the outer sheath 6, here of a tetrafluoroethylene / hexafluoropropylene copolymer (FEP) encloses the layer 5 of the shield.
  • the outer diameter of this multi-layered high-frequency coaxial cable in this embodiment is about 2.00 mm, ie a coaxial cable with extremely small outer dimensions.
  • the cable is highly flexible with high mechanical strength and durability of the transmission properties even with changing temperature stress.
  • the cable according to the invention is characterized in detail, inter alia, by a low tolerance of the characteristic impedance and by a low operating capacity.
  • a 75 ohm cable according to the invention has an operating capacity of ⁇ 60 nF / km.
  • the attenuation is for example at 1 MHz at 2.3 dB / 100m, at 100 MHz at 27.7 dB / 100m and at 500 MHz at 67.9 dB / 100m.

Landscapes

  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
  • Laminated Bodies (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Claims (9)

  1. Câble électrique coaxial à haute fréquence très souple comportant une isolation multicouche en matériaux polymères entourant le conducteur central, et un blindage électrique qui entoure l'isolation et qui est recouvert d'une gaine externe, dont la première couche (2) qui entoure le conducteur central (1) se compose d'un fluoropolymère transformé à partir de la masse fondue et est recouverte par une seconde couche (3) constituée par un enroulement à une ou plusieurs couches d'une bande de polytétrafluoroéthylène microporeux étiré et fritté, et dans lequel la couche de bande extérieure de l'enroulement, au moins, est liée par force à la surface adjacente d'une feuille de métal ou de plastique métallisé enduite d'adhésif et servant de premier blindage électrique (4), tandis qu'un second blindage (5) sous la forme d'une couche extérieure de fils métalliques ou d'un treillis de fils métalliques individuels est en contact avec le premier blindage (4).
  2. Câble selon la revendication 1,
    caractérisé en ce que
    l'épaisseur de la première couche (2) va de 0,8 à 0,1 mm, de préférence de 0,3 à 0,2 mm.
  3. Câble selon la revendication 1,
    caractérisé en ce que
    l'épaisseur de la seconde couche (3) va de 0,8 à 0,2 mm, de préférence de 0,4 à 0,3 mm.
  4. Câble selon la revendication 1,
    caractérisé en ce que
    l'épaisseur de la bande de polytétrafluoroéthylène étiré va de 15 à 250 µm, de préférence de 30 à 100 µm.
  5. Câble selon la revendication 1 ou l'une des revendications suivantes,
    caractérisé en ce que
    la première couche (2) entourant le conducteur central (1) se compose d'un fluoropolymère expansé.
  6. Câble selon la revendication 1 ou l'une des revendications suivantes,
    caractérisé en ce que
    le blindage électrique (4, 5) est entouré d'une gaine externe (6) en fluoropolymère.
  7. Câble selon la revendication 1 ou l'une des revendications suivantes,
    caractérisé en ce que
    le blindage électrique (4, 5) est entouré d'une gaine externe (6) en matériau polymère exempt d'halogène et ignifuge, ou ignifuge et anticorrosion.
  8. Câble selon la revendication 1 ou l'une des revendications suivantes,
    caractérisé en ce que
    la constante diélectrique de la première couche (2) est plus importante que celle de la seconde couche (3).
  9. Câble selon la revendication 1 ou l'une des revendications suivantes,
    caractérisé en ce que
    les deux couches (2 ; 3) sont collées l'une à l'autre.
EP00106427A 1999-04-23 2000-03-24 Câble coaxial à haute fréquence Expired - Lifetime EP1047084B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19918539 1999-04-23
DE19918539A DE19918539A1 (de) 1999-04-23 1999-04-23 Koaxiales Hochfrequenzkabel

Publications (3)

Publication Number Publication Date
EP1047084A2 EP1047084A2 (fr) 2000-10-25
EP1047084A3 EP1047084A3 (fr) 2001-05-16
EP1047084B1 true EP1047084B1 (fr) 2007-10-10

Family

ID=7905671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00106427A Expired - Lifetime EP1047084B1 (fr) 1999-04-23 2000-03-24 Câble coaxial à haute fréquence

Country Status (5)

Country Link
US (1) US6337443B1 (fr)
EP (1) EP1047084B1 (fr)
AT (1) ATE375595T1 (fr)
CA (1) CA2306340C (fr)
DE (2) DE19918539A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
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TWI264020B (en) * 2002-02-08 2006-10-11 Hirakawa Hewtech Corp Foamed coaxial cable with high precision and method of fabricating same
JP4055125B2 (ja) * 2002-12-24 2008-03-05 日本光電工業株式会社 同軸ケーブルおよびそれを用いた伝送トランス
CN100416711C (zh) * 2003-05-22 2008-09-03 平河福泰克株式会社 发泡同轴线缆及其制造方法
DE10325517A1 (de) * 2003-06-05 2004-12-23 Hew-Kabel/Cdt Gmbh & Co. Kg Elektrische Heizleitung oder Heizband
JP2005339818A (ja) * 2004-05-24 2005-12-08 Hirakawa Hewtech Corp 高精度発泡同軸ケーブル
US20060011376A1 (en) * 2004-07-16 2006-01-19 General Electric Company Multi-axial electrically conductive cable with multi-layered core and method of manufacture and use
EP2156860A1 (fr) * 2008-08-20 2010-02-24 Centre National De La Recherche Scientifique-CNRS Procédé de fabrication d'électrodes isolées pour l'application de champs électriques dans un matériau conducteur
WO2010064579A1 (fr) * 2008-12-02 2010-06-10 株式会社フジクラ Câble de transmission et câble de transmission de signal l’utilisant
US8308505B2 (en) 2009-12-09 2012-11-13 Scott Hatton Guarded coaxial cable assembly
CH704600A1 (de) * 2011-03-14 2012-09-14 Huber+Suhner Ag Koaxialkabel.
EP2615240A3 (fr) * 2012-01-16 2014-09-03 Prad Research Development Limited Moteur enrobé de tubage conducteur
US9455069B2 (en) * 2012-07-24 2016-09-27 Schlumberger Technology Corporation Power cable system
FR3002076B1 (fr) * 2013-02-12 2022-11-11 Nexans Cable electrique resistant aux decharges partielles
JP6372325B2 (ja) * 2014-11-27 2018-08-15 日立金属株式会社 同軸ケーブル及びそれを用いた医療用ケーブル
US9672958B2 (en) * 2015-05-19 2017-06-06 Te Connectivity Corporation Electrical cable with shielded conductors
CN105931747A (zh) * 2016-06-17 2016-09-07 江阴凯博通信科技有限公司 一种双层屏蔽环保同轴防伪电缆
US11545280B2 (en) 2018-08-23 2023-01-03 The Esab Group Inc. Cable hose with embedded features
US10964451B2 (en) 2018-11-06 2021-03-30 The Esab Group Inc. Cable hose with conductive electromagnetic interference shield
CN111863406B (zh) * 2020-08-14 2022-05-24 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
CN114068105B (zh) * 2021-11-17 2023-10-27 佑创射频技术(江苏)有限公司 一种稳相稳幅电缆的生产工艺

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Also Published As

Publication number Publication date
ATE375595T1 (de) 2007-10-15
US6337443B1 (en) 2002-01-08
CA2306340A1 (fr) 2000-10-23
EP1047084A2 (fr) 2000-10-25
DE19918539A1 (de) 2000-10-26
CA2306340C (fr) 2005-11-15
DE50014701D1 (de) 2007-11-22
EP1047084A3 (fr) 2001-05-16

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