EP0190939B1 - High frequency attenuation cable and harness - Google Patents

High frequency attenuation cable and harness Download PDF

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Publication number
EP0190939B1
EP0190939B1 EP86300836A EP86300836A EP0190939B1 EP 0190939 B1 EP0190939 B1 EP 0190939B1 EP 86300836 A EP86300836 A EP 86300836A EP 86300836 A EP86300836 A EP 86300836A EP 0190939 B1 EP0190939 B1 EP 0190939B1
Authority
EP
European Patent Office
Prior art keywords
high frequency
cable
dielectric constant
layer
conductor
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
EP86300836A
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German (de)
English (en)
French (fr)
Other versions
EP0190939A2 (en
EP0190939A3 (en
Inventor
Richard Lloyd
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.)
Raychem Corp
Original Assignee
Raychem Corp
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 Raychem Corp filed Critical Raychem Corp
Priority to AT86300836T priority Critical patent/ATE64795T1/de
Publication of EP0190939A2 publication Critical patent/EP0190939A2/en
Publication of EP0190939A3 publication Critical patent/EP0190939A3/en
Application granted granted Critical
Publication of EP0190939B1 publication Critical patent/EP0190939B1/en
Anticipated expiration legal-status Critical
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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
    • 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
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics
    • H01B11/14—Continuously inductively loaded cables, e.g. Krarup cables
    • H01B11/146—Continuously inductively loaded cables, e.g. Krarup cables using magnetically loaded coatings

Definitions

  • This invention relates to a high frequency attenuation cable and to a high frequency attenuation cable harness.
  • High frequency attenuation cables are well known.
  • such cables include an absorption medium which filters out high frequency energy which could otherwise interfere with the operation of the cable.
  • the effectiveness with which the high frequency energy is filtered out is referred to as the high frequency attenuation. The greater the attenuation, the higher the effectiveness.
  • One aspect of this invention comprises a high frequency attenuation cable comprising a core comprising at least one conductor, each said conductor being surrounded by a layer of high dielectric constant material having a dielectric constant greater than about 4 when measured at 10 MHz and a volume resistivity of at least about 1013 ohm-cm; and a layer of high frequency absorption medium.
  • the high dielectric constant material preferably also has a tensile strength of at least about 4,000 pounds per square inch (psi) (285 Kg/cm2). Additional layers of the absorption medium and/or the high dielectric material and/or a second dielectric material may also be present.
  • the core is that portion of the cable which is surrounded by the electrically conductive shield and any outer or protective jacketing.
  • Figure 1 is a cut-away side view of one embodiment of a cable construction according to the invention.
  • Figure 2 is a cut-away side view of another embodiment of a cable construction according to the invention.
  • Figure 3 is a cross-sectional view of one embodiment of a cable harness according to the invention.
  • Figure 4 is a cross-sectional view of another embodiment of a cable harness according to the invention.
  • Figures 5 and 6 are graphs of attenuation versus frequency for cable constructions according to the invention compared to cable constructions according to the prior art.
  • the cable comprises a core which, in turn, comprises conductor 4, a layer of high frequency absorption medium 6 surrounding the conductor, and a layer of high dielectric constant material 8 surrounding the high frequency absorption medium.
  • the cable may further comprise additional layers of absorption medium, high dielectric constant material, a second dielectric material and the like. Further the cable generally also is provided with an electrically conductive shield and a protective outer jacket.
  • a layer of high dielectric constant material markedly increases the high frequency attenuation of the cable in the frequency range of 10 to 100 MHz.
  • TEFZEL is a copolymer of ethylene and tetrafluoroethylene and is a product of E.I. duPont de Nemours, Wilmington, DE.
  • TEFZEL is a copolymer of ethylene and tetrafluoroethylene and is a product of E.I. duPont de Nemours, Wilmington, DE.
  • Both polyethylene and TEFZEL are materials having low dielectric constants ( ⁇ of about 2-3).
  • prior art cables exhibit lower high frequency attenuation in the frequency range of 10-100 MHz than is desirable for certain uses.
  • the high frequency absorption medium such as the well-known lossy materials disclosed in the Cornelius et al. references serves to allow the passage of low frequency energy but absorbs the high frequency energy.
  • Lossy materials are also disclosed in Mayer, USP 3,309,633 and USP 3,191,132 which are incorporated herein by reference.
  • a preferred lossy material for the present invention is ferrite-loaded polymer, for example, ferrite-loaded VITON® A (VITON A is a copolymer of vinylidene fluoride and hexafluoropropylene and is a product of E. I. Du Pont de Nemours, Wilmington, DE).
  • FIG. 2 there is disclosed a second embodiment of the invention.
  • a high frequency attenuation cable 2' The cable comprises a conductor 4, a layer of high dielectric constant material 9 surrounding the conductor, a layer of high frequency absorption medium 6 surrounding the layer 9 of high dielectric constant material, and an additional layer of dielectric material 8 surrounding the layer of high frequency absorption medium.
  • the dielectric material of the additional layer can be a high dielectric constant material, as defined herein, or a second dielectric material, e.g. one having a lower dielectric constant, e.g. below about 3.
  • high frequency attenuation cable (not shown) comprises a conductor, a layer of high dielectric constant material surrounding the conductor, and a high frequency absorption medium surrounding the layer of high dielectric material. It is believed that this cable construction will also lead to improved high frequency attenuation in the 10 to 100 megahertz range, as was the case with the previous embodiments.
  • the high dielectric material preferably polyvinylidene fluoride
  • the high dielectric material can be located either inside of the high frequency absorption medium or outside of the high frequency absorption medium or both inside and outside of the high frequency absorption medium.
  • a layer of dielectric material having a dielectric constant less than about 3 can be included in the construction, preferably as an outermost layer.
  • the additional layer of dielectric material can be selected to provide desired electrical and/or mechanical properties.
  • the additional layer should be of a high dielectric constant material, e.g. polyvinylidene fluoride.
  • a material having a lower dielectric constant e.g. polyethylene or TEFZEL, can be used.
  • the selection of the additional layer of dielectric material is made to provide good mechanical properties.
  • Suitable dielectric materials under these criteria include polyethylene, polyvinyl chloride, TEFZEL, polyesters, polyamides, polyamide-imides, polyether-esters, and the like also polymeric blends.
  • the high dielectric constant material and the second dielectric material, if present, can include various additives such as stabilizers, pigments, flame retardants, processing aids and the like.
  • the cable constructions may further comprise an electrically conductive shielding means surrounding the core and an outer jacket surrounding the shielding means.
  • a high dielectric constant material leads to significantly improved performance. It has also been found that reducing the wall thickness of the high dielectric constant material will also lead to enhanced performance. Thus, in a preferred embodiment of this invention, a relatively thin layer of high dielectric constant material is used. While the reason for the improved performance is not fully understood, it is believed to be due to the increased capacitance between the absorptive material and the conductor when the high dielectric constant material is positioned therebetween or between the absorptive medium and the electrically conductive shield when the high dielectric material is positioned outside of the absorptive medium. The capacitance is further increased if the layer of the high dielectric constant material is relatively thin.
  • each of the cable harnesses comprises a plurality of cables with each cable having a core as described above.
  • the core will comprise a conductor, a high frequency absorption medium surrounding the conductor and at least one layer of high dielectric constant material, preferably polyvinylidene fluoride.
  • the only difference between the various cores will be the location of the high dielectric constant material which may be inside or outside, or both inside and outside of the high frequency absorption medium.
  • Figure 3 illustrates one embodiment of a cable harness 20 having a plurality of cables 22 in which, in each core there is a conductor 24 surrounded by a high frequency absorption medium 26 which in turn is surrounded by a layer of high dielectric constant material 28.
  • each cable 42 of cable harness 40 has a core having at least one conductor 44 surrounded by a high frequency absorption medium 46 which is in turn surrounded by a layer of high dielectric constant material 48.
  • each cable comprises electrically conductive shielding means 30 surrounding each of the cores and an outer jacket 32 surrounding each of the electrically conductive shielding means.
  • the construction in Figure 3 may further comprise protective outer jacketing 34 surrounding the plurality of cables.
  • the cable harness 40 comprises gross electrically conductive shielding means 50 surrounding the plurality of cables and protective outer jacketing 52 surrounding the shielding means.
  • the high frequency absorption medium may be any of the well-known lossy materials.
  • the preferred lossy material is ferrite-loaded polymer and more preferably ferrite-loaded VITON.
  • the cable construction having the KYNAR insulation layer (Sample 2) is far superior over the entire frequency range to the cable construction having the TEFZEL insulation layer (Sample 1). Most importantly, in the critical range of 10 to 100 MHz the attenuation has been dramatically improved.
  • Sample 1 had KYNAR (high dielectric constant material) insulation and the other sample (Sample 2) had polyethylene (low dielectric constant material) insulation.
  • Sample 2 had polyethylene (low dielectric constant material) insulation.
  • the sample having the KYNAR is far superior over the entire frequency range to the sample having the polyethylene insulation.
  • the critical range of 10 to 100 MHz the attenuation of the sample having KYNAR insulation is markedly improved over the sample having the polyethylene insulation.
  • an insulation layer of high dielectric constant material preferably polyvinylidene fluoride (commercially available as KYNAR) that the attenuation of the cable construction in the frequency range of 10 to 100 MHz is surprisingly and unexpectedly improved over the prior art cable constructions using polyethylene, TEFZEL, or other similar insulation materials.
  • KYNAR polyvinylidene fluoride
  • a sample was prepared by extruding a first layer of polyvinylidene fluoride having a wall thickness of 3 mils onto a stranded, tin plated 20 AWG copper conductor. Onto this was extruded a 4 mil layer of ferrite filled VITON A as described in Examples I and II.
  • a third layer consisting of an ethylene tetrafluoroethylene copolymer (ETFE) with a wall thickness of 4 mils was then extruded on top of the first two layers. The sample was then surrounded with a metallic braid, and the insertion loss was measured. The results were as follows:
EP86300836A 1985-02-06 1986-02-06 High frequency attenuation cable and harness Expired - Lifetime EP0190939B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86300836T ATE64795T1 (de) 1985-02-06 1986-02-06 Hochfrequenzdaempfungskabel und buendel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69864585A 1985-02-06 1985-02-06
US698645 1985-02-06

Publications (3)

Publication Number Publication Date
EP0190939A2 EP0190939A2 (en) 1986-08-13
EP0190939A3 EP0190939A3 (en) 1988-08-17
EP0190939B1 true EP0190939B1 (en) 1991-06-26

Family

ID=24806107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86300836A Expired - Lifetime EP0190939B1 (en) 1985-02-06 1986-02-06 High frequency attenuation cable and harness

Country Status (9)

Country Link
EP (1) EP0190939B1 (pt)
JP (1) JPS61198509A (pt)
KR (1) KR860006808A (pt)
AT (1) ATE64795T1 (pt)
AU (1) AU5323586A (pt)
BR (1) BR8600498A (pt)
CA (1) CA1255767A (pt)
DE (1) DE3679917D1 (pt)
ES (1) ES9200007A1 (pt)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179196B (en) * 1985-08-08 1989-01-11 Pirelli General Plc Electric cables
US5103067A (en) * 1991-02-19 1992-04-07 Champlain Cable Corporation Shielded wire and cable
US5262592A (en) * 1991-02-19 1993-11-16 Champlain Cable Corporation Filter line cable featuring conductive fiber shielding
US5206459A (en) * 1991-08-21 1993-04-27 Champlain Cable Corporation Conductive polymeric shielding materials and articles fabricated therefrom
US5262591A (en) * 1991-08-21 1993-11-16 Champlain Cable Corporation Inherently-shielded cable construction with a braided reinforcing and grounding layer
DE9207526U1 (pt) * 1992-06-01 1992-09-10 Siemens Ag, 8000 Muenchen, De
FR2705161B1 (fr) * 1993-05-10 1995-06-30 Alcatel Cable Câble utilisable dans le domaine des télécommunications.
US5545853A (en) * 1993-07-19 1996-08-13 Champlain Cable Corporation Surge-protected cable
US6314182B1 (en) 1998-08-19 2001-11-06 3M Innovative Properties Company External filter box
CN108461190A (zh) * 2018-02-07 2018-08-28 上海传输线研究所（中国电子科技集团公司第二十三研究所） 一种耐复杂电磁环境的滤波电线
CN108986961A (zh) * 2018-07-11 2018-12-11 常州凌天达传输科技有限公司 一种聚偏氟乙二烯绝缘电磁滤波电缆及加工方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1428517A (fr) * 1964-11-26 1966-02-18 Organes de transmission d'énergie électrique à absorption sélective
US4499438A (en) * 1981-12-07 1985-02-12 Raychem Corporation High frequency attenuation core and cable

Also Published As

Publication number Publication date
CA1255767A (en) 1989-06-13
JPS61198509A (ja) 1986-09-02
ES9200007A1 (es) 1991-12-01
BR8600498A (pt) 1986-10-21
AU5323586A (en) 1986-08-14
EP0190939A2 (en) 1986-08-13
EP0190939A3 (en) 1988-08-17
ATE64795T1 (de) 1991-07-15
DE3679917D1 (de) 1991-08-01
KR860006808A (ko) 1986-09-15

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