WO1999030331A1 - Cable haute frequence - Google Patents

Cable haute frequence Download PDF

Info

Publication number
WO1999030331A1
WO1999030331A1 PCT/EP1998/007626 EP9807626W WO9930331A1 WO 1999030331 A1 WO1999030331 A1 WO 1999030331A1 EP 9807626 W EP9807626 W EP 9807626W WO 9930331 A1 WO9930331 A1 WO 9930331A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
electrically conductive
pairs
shielding material
shielding
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.)
Ceased
Application number
PCT/EP1998/007626
Other languages
German (de)
English (en)
Inventor
David Patrick Murray
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.)
TE Connectivity Germany GmbH
Original Assignee
Krone 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 Krone GmbH filed Critical Krone GmbH
Priority to AU19644/99A priority Critical patent/AU1964499A/en
Publication of WO1999030331A1 publication Critical patent/WO1999030331A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01B11/08—Screens specially adapted for reducing cross-talk
    • H01B11/085—Screens specially adapted for reducing cross-talk composed of longitudinal tape conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0861—Flat or ribbon cables comprising one or more screens

Definitions

  • the present invention relates to electrically conductive cables and, in particular, to electrically conductive cables that can carry high-frequency signals.
  • Electrically conductive cables are still the main medium used to transmit signals between remote locations in communication systems such as local area networks. Modern communication systems like this operate at fairly high frequencies, and with such systems it is necessary to minimize the effects of crosstalk in the electrically conductive cables.
  • a common way to construct a cable with crosstalk attenuation is to use the twisted pair structure. Electrically conductive cables consist of several symmetrical pairs running along the cable, and in such a structure the pairs are twisted along the length of the cable such that crosstalk induced by part of a twisted pair is minimized by that induced in the following section is reduced or dampened.
  • One problem with the twisted pair structure is that it makes it difficult to terminate the cable because the pairs are not readily identifiable or ordered.
  • An object of the present invention is to provide an improved cable concept which does not suffer from the above disadvantages.
  • an electrically conductive cable consisting of a plurality of electrically conductive pairs and a shielding means in the form of a sheet of material braided between the pairs so that any two adjacent pairs are separated by the shielding material.
  • the use of a single layer braided between the pairs results in a * cable that is relatively light and inexpensive to manufacture and provides good crosstalk attenuation.
  • the dimensions of the sheet of material can be such that it extends around the cable and forms an outer shield for the cable.
  • a flat cable-like cable in which the electrically conductive pairs are arranged side by side in the longitudinal direction.
  • This concept is particularly advantageous because the pairs can be arranged in an orderly and recognizable manner, which makes the conclusion quite simple. It is also possible to use this method to form cables which have a generally round or circular cross section.
  • the shielding material can be formed from a film which is plastic-coated on one surface.
  • the shielding material is grounded in use.
  • FIG. 1 shows a schematic illustration of a
  • FIG. 2 shows a modification of the structure of FIG. 1,
  • FIG. 3 shows a schematic side view of an apparatus for producing a cable structure of the type shown in FIG. 1 or 2, and
  • Figure 4 is a first view of a winding template used in the device of Figure 3.
  • a cable structure in accordance with one embodiment of the present invention includes: a plurality of symmetrical pairs (10) that extend longitudinally side by side.
  • a layer of shielding material (11) is braided between the pairs in such a way that it runs alternately above and below the pairs in such a way that adjacent pairs are separated by the shielding material.
  • the layer (11) extends over the full longitudinal extent of the cable.
  • the shielding material can be a film that is plastic coated on one side.
  • the cable of FIG. 1 is a flat cable-like cable in which the symmetrical pairs (10) are arranged side by side.
  • FIG. 1 and 2 The structure shown in Figures 1 and 2 is a flat cable type cable, but it is understood that the same method can be used to minimize crosstalk in cables with other cross-sectional shapes, such as generally round cross-sections.
  • the shielding material (11) When using the cable, the shielding material (11) is grounded. It is understood that there are a number of technical factors that must be considered when designing a cable of the type described. These include the requirement of specifying the thickness of the shield, the conductor material of the symmetrical line, the conductor size of the symmetrical line, the insulation material of the symmetrical line and the insulation diameter of the symmetrical line.
  • the thickness of the shielding material is related to the required near crosstalk performance of the cable and is typically chosen to be a minimum in order to meet the required specification for a particular cable design. This requirement is usually met through cable testing.
  • the most suitable material for the line conductor is copper, and the size of the conductor is determined by the attenuation of the line.
  • An example has been constructed using copper with a standard value of 0.5 mm in diameter to achieve a DC resistance of less than 93.8 m ⁇ per meter at 20 ° C and an attenuation of less than 0.22 dB per meter at 100 MHz .
  • the insulation material for the copper line can be a polyolefin material with properties optimized for the physical and electrical requirements.
  • the insulation diameter of the balanced line is a parameter that affects the line impedance and should be over 1 mm in the example given above to compensate for the capacitance effects of the shield.
  • Cable can be made using an apparatus shown in Figures 3 and 4.
  • This device comprises upper, side-by-side coils (20) and lower, side-by-side coils (21) and a drum (22) on which the
  • Shielding material (11) is wound. Electrically conductive wires are wound on the coils (20 and 21). Foil from the drum (22) and wires from the coils (20 and 21) are a winding template
  • Rollers (21) are arranged in lower pairs
  • (11) runs through a between the upper holes (28) and the longitudinal slots (32) arranged in the lower holes (30).

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Abstract

L'invention concerne un câble électroconducteur comprenant plusieurs paires conductrices et un élément de blindage sous forme de couche de matériau. L'invention vise à perfectionner le concept dudit câble. A cet effet, l'élément de blindage situé entre les paires est tressé, de manière que deux paires adjacentes, quelles qu'elles soient, se trouvent séparées par le matériau de blindage.
PCT/EP1998/007626 1997-12-08 1998-11-27 Cable haute frequence Ceased WO1999030331A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU19644/99A AU1964499A (en) 1997-12-08 1998-11-27 High frequency cable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9725987.3A GB9725987D0 (en) 1997-12-08 1997-12-08 High frequency cable
GB9725987.3 1997-12-08

Publications (1)

Publication Number Publication Date
WO1999030331A1 true WO1999030331A1 (fr) 1999-06-17

Family

ID=10823307

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/007626 Ceased WO1999030331A1 (fr) 1997-12-08 1998-11-27 Cable haute frequence

Country Status (3)

Country Link
AU (1) AU1964499A (fr)
GB (1) GB9725987D0 (fr)
WO (1) WO1999030331A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8319104B2 (en) 2009-02-11 2012-11-27 General Cable Technologies Corporation Separator for communication cable with shaped ends

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551576A (en) * 1984-04-04 1985-11-05 Parlex Corporation Flat embedded-shield multiconductor signal transmission cable, method of manufacture and method of stripping
EP0257855A2 (fr) * 1986-08-04 1988-03-02 E.I. Du Pont De Nemours And Company Câble ayant une cloison ondulée

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551576A (en) * 1984-04-04 1985-11-05 Parlex Corporation Flat embedded-shield multiconductor signal transmission cable, method of manufacture and method of stripping
EP0257855A2 (fr) * 1986-08-04 1988-03-02 E.I. Du Pont De Nemours And Company Câble ayant une cloison ondulée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8319104B2 (en) 2009-02-11 2012-11-27 General Cable Technologies Corporation Separator for communication cable with shaped ends
US9018530B2 (en) 2009-02-11 2015-04-28 General Cable Technologies Corporation Separator for communication cable with shaped ends

Also Published As

Publication number Publication date
AU1964499A (en) 1999-06-28
GB9725987D0 (en) 1998-02-04

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