EP0254964A2 - Ecran magnétique ou électromagnétique et câble électrique ainsi équipé - Google Patents

Ecran magnétique ou électromagnétique et câble électrique ainsi équipé Download PDF

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Publication number
EP0254964A2
EP0254964A2 EP87110235A EP87110235A EP0254964A2 EP 0254964 A2 EP0254964 A2 EP 0254964A2 EP 87110235 A EP87110235 A EP 87110235A EP 87110235 A EP87110235 A EP 87110235A EP 0254964 A2 EP0254964 A2 EP 0254964A2
Authority
EP
European Patent Office
Prior art keywords
shielding
layer
magnetic
doped
plastic
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.)
Withdrawn
Application number
EP87110235A
Other languages
German (de)
English (en)
Other versions
EP0254964A3 (fr
Inventor
Eric Dipl.-Phys. Guiol
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 EP0254964A2 publication Critical patent/EP0254964A2/fr
Publication of EP0254964A3 publication Critical patent/EP0254964A3/fr
Withdrawn legal-status Critical Current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
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources

Definitions

  • the invention relates to electromagnetic or magnetic shielding and electrical cables constructed therewith.
  • cables For high frequency applications are cables, whose shielding consists of a simply braided shield, often not sufficient. A better shielding effect can be achieved with two braided shields. In the case of very high demands on the shielding effect, as is required, for example, in the field of space travel, aviation, telecommunications and data processing, such a shielding is also not sufficient.
  • cables with three-layer shielding have been created, the inner layer and the outer layer each being formed by a metal braid shield and the intermediate layer by a polycrystalline material such as, for example, ⁇ -metal, metallic glass and the like.
  • Such a shield structure leads to cables with only little flexibility and with difficult processing when connecting to the contact elements of plug connect.
  • essentially only a shielding of electrical springs is achieved, but not magnetic fields.
  • the electrically conductive intermediate layer electrically connects the inner shield and the outer shield, and therefore the three-layer shield basically acts only as a thick-layer shield.
  • a coaxial cable which has a magnetic layer between two metal shields, which is a non-conductive or only slightly conductive magnetic mixture which by mixing in ferrite dust or other magnetic metallic dust a flexible plastic carrier material can be produced.
  • doped insulating layers leads to improved cable flexibility compared to cables with rigid shielding layers.
  • the shielding attenuation should be greater than 100 dB for the largest possible frequency range in order to prevent radiation and radiation of interfering signals in the largest possible frequency range.
  • Electromagnetic radiation on the signal to be transmitted has a negative effect, particularly in the case of digital signals, in that the pulse edges are flattened, which leads to signal falsifications and a reduction in the possible pulse repetition frequency.
  • An object of the invention is to make available electromagnetic shielding which, with a highly flexible cable structure, leads to a high shielding attenuation of both electrical and magnetic fields in the widest possible frequency range.
  • the one layer of the shield consists of metal-doped plastic and highly flexible plastics are available, a cable provided with the shield according to the invention does not have to suffer any loss of flexibility.
  • the extraordinarily good electromagnetic shielding damping properties are achieved in that the magnetic field emitting or emitting is bundled in the shielding layer from plastic doped with non-magnetic metal particles.
  • Shields against electrical fields which consist of electrical conductors, act in that these electrical conductors form an equipotential surface which is connected to the potential 0 by external connection, for example.
  • Charge carriers which are caused by local electrical fields, flow away immediately, which creates the electrical shielding effect. The higher the electrical conductivity, the better the electrical shielding effect.
  • Such electrical conductors have no or only a very weak shielding against magnetic fields, if one disregards very high frequencies in the GHz range. In particular in relatively low frequency ranges, for example in the lower MHz or even KHz range, there is practically no magnetic shielding.
  • non-magnetic metal particles such as copper powder
  • induced eddy currents are produced in these metal particles by the high-frequency magnetic field, which in turn cause a magnetic field that is opposite to the external magnetic field.
  • the eddy current strength and thus the magnetic shielding effect increases with increasing magnetic field strength and increasing frequency, which not only leads to higher shielding attenuation than with ferrite doping per se, but also extends the range of good shielding attenuation into much higher frequency regions.
  • the measure according to the invention therefore leads to surprisingly good magnetic shielding results.
  • a three-layer shield the inner and outer shield layers of which are each formed by an electrical conductor such as, in particular, a metal braid or a metal foil and whose middle layer is formed by the metal-doped plastic layer.
  • the latter leads to electrical insulation between the inner ones and outer electrically conductive shield layer. This causes the electrical field to be shielded to be reflected on two electrically different shielding layers.
  • the shielding according to the invention with an intermediate plastic layer, in which non-magnetic metal particles are embedded therefore leads to a considerably better magnetic shielding via a very wide frequency range, while maintaining good cable flexibility.
  • a cable provided with the electromagnetic shielding according to the invention can therefore have both high flexibility and an outstanding electromagnetic shielding.
  • the flexible, electrically non-conductive plastic layer doped with non-magnetic metal particles also has independent significance for the invention. Where shielding only magnetic fields are important, it can be used advantageously without electrically shielding shield layers, e.g. B. for magnetically shielded cables that are supposed to retain a high degree of flexibility.
  • Fig. 1 shows an example of a coaxial cable with a single signal conductor A, which is surrounded by a dielectric B.
  • the dielectric B is spanned by a first screen C made of a metal mesh.
  • the first screen C is surrounded by a metal-doped, electrically non-conductive plastic intermediate layer D, which in turn is surrounded by a second screen E made of a metal mesh.
  • the outermost layer of the cable is formed by a plastic jacket.
  • metal-doped plastic intermediate layer D Particularly suitable materials for the metal-doped plastic intermediate layer D are PTFE (polytetrafluoroethylene), in which copper powder is preferably embedded.
  • cables whose middle shielding or intermediate layer D is doped with copper particles have on the one hand a considerably higher shielding attenuation and on the other hand a high shielding attenuation up to substantially higher frequency ranges than with ferrite doping.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
EP87110235A 1986-07-29 1987-07-15 Ecran magnétique ou électromagnétique et câble électrique ainsi équipé Withdrawn EP0254964A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3625631 1986-07-29
DE19863625631 DE3625631A1 (de) 1986-07-29 1986-07-29 Elektromagnetische abschirmung

Publications (2)

Publication Number Publication Date
EP0254964A2 true EP0254964A2 (fr) 1988-02-03
EP0254964A3 EP0254964A3 (fr) 1989-05-24

Family

ID=6306213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110235A Withdrawn EP0254964A3 (fr) 1986-07-29 1987-07-15 Ecran magnétique ou électromagnétique et câble électrique ainsi équipé

Country Status (5)

Country Link
US (1) US4871883A (fr)
EP (1) EP0254964A3 (fr)
JP (1) JPS63170811A (fr)
DE (1) DE3625631A1 (fr)
IL (1) IL83300A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014223134A1 (de) 2014-11-13 2016-05-19 Robert Bosch Gmbh Elektrisches Antriebssystem und Kraftfahrzeug mit einem elektrischen Antriebssystem
CN116526111A (zh) * 2023-04-20 2023-08-01 嘉兴翼波电子有限公司 一种适用于天线设备的伸缩式鱼骨信号发射线

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014223134A1 (de) 2014-11-13 2016-05-19 Robert Bosch Gmbh Elektrisches Antriebssystem und Kraftfahrzeug mit einem elektrischen Antriebssystem
CN116526111A (zh) * 2023-04-20 2023-08-01 嘉兴翼波电子有限公司 一种适用于天线设备的伸缩式鱼骨信号发射线

Also Published As

Publication number Publication date
IL83300A0 (en) 1987-12-31
US4871883A (en) 1989-10-03
EP0254964A3 (fr) 1989-05-24
IL83300A (en) 1991-01-31
DE3625631C2 (fr) 1990-02-08
DE3625631A1 (de) 1988-02-04
JPS63170811A (ja) 1988-07-14

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