EP0436489A1 - Koaxialkabel - Google Patents

Koaxialkabel Download PDF

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Publication number
EP0436489A1
EP0436489A1 EP91100050A EP91100050A EP0436489A1 EP 0436489 A1 EP0436489 A1 EP 0436489A1 EP 91100050 A EP91100050 A EP 91100050A EP 91100050 A EP91100050 A EP 91100050A EP 0436489 A1 EP0436489 A1 EP 0436489A1
Authority
EP
European Patent Office
Prior art keywords
coaxial cable
insulation
groove
diameter
insulating sleeve
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Withdrawn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
EP91100050A
Other languages
German (de)
English (en)
French (fr)
Inventor
Otto Csc. Verbich
Roman Miertus
Pavol Kollarik
Maros Cernuska
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.)
VYSKUMNY USTAV KABLOV A IZOLANTOV STATNY PODNIK
Original Assignee
VYSKUMNY USTAV KABLOV A IZOLANTOV STATNY PODNIK
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 VYSKUMNY USTAV KABLOV A IZOLANTOV STATNY PODNIK filed Critical VYSKUMNY USTAV KABLOV A IZOLANTOV STATNY PODNIK
Publication of EP0436489A1 publication Critical patent/EP0436489A1/de
Withdrawn legal-status Critical Current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
    • H01B11/18—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 invention relates to a high-frequency coaxial cable for the transmission of fast digital signals, which is intended to ensure a high and at the same time guaranteed speed of the electromagnetic signals in the cable, in order to ensure a substantial reduction in false alarms when evaluating control pulses in the computer network.
  • High-frequency coaxial cables are already manufactured with cell PE insulation, which is produced by direct gassing, which enables the propagation speed to be increased by up to 90%, but is less homogeneous and much more demanding in terms of production.
  • high-frequency coaxial cables with cavity insulation consisting of a spacer in the form of a thick polyethylene tape wound on the conductor and of a closely fitting tube to which the usual outer conductors are applied in the form of a braid or a combination of foils and braid.
  • the advantage of these coaxial cables is the increased transmission speed of over 90% compared to vacuum.
  • a disadvantage is that the size of the transmission or propagation speed is determined by the gradient of the spacer and the thickness of the tube, the gradient in particular has a significant influence on the speed of propagation and this speed is finally determined after application of the tube and not can be changed more. Such a cable causes a relatively large spread of this most important parameter.
  • Another disadvantage is the relatively high mechanical stiffness, because the tube must be made of hard material in order to counteract deformations of its circular cross section into an oval when the tube bends. The spacer permanently centers the position of the inner conductor, but cannot prevent the tube from flattening.
  • the object of the invention is to provide a high-frequency coaxial cable for, in particular, fast computer networks or the like, which enables high propagation speeds without the transmission-technical disadvantages of known coaxial cables with a simplified structural design.
  • the centrally applied cell PE insulation is provided over the entire length of the surface with one or more spiral furrows, which can have different shapes.
  • the depth of the furrows should be at least 10% of the insulation diameter and the slope at least equal to three times the width of the furrow.
  • the advantages of the solution according to the invention lie mainly in the fact that the air volume contained in the insulation is larger and, above all, precisely adjustable, the increase in the speed of propagation of the electromagnetic or digital pulses in the coaxial cable also increasing. It is possible to adjust this speed operationally and very sensitively through the depth and number of furrows, their shape and incline. For a unit length of the cable, changing the ratio of air and cell PE can increase the speed of propagation exactly as the customer desires can be set to thousandths of a percent. Another advantage is the high flexibility of the coaxial cable.
  • the coaxial cable shown schematically in the dismantling section contains an inner conductor 1 on which an insulation 2 is foamed cylindrically.
  • a spiral or helical groove 21 is formed in the outer part of the insulation 2.
  • An outer conductor 3 and a jacket 4 are arranged above the insulation 2.
  • the coaxial cable has an inner conductor 1 made of Cu wire with a diameter of 0.55 mm and a chemically foamed insulation 2 with a diameter of 3.7 mm with a spiral-shaped groove with a semicircular cross section and a pitch of 13 mm.
  • an outer conductor 3 made of two plastic foils metallized on one side with the metal sides turned towards one another and tinned fine copper wires lying between them.
  • a jacket 4 made of a soft PVC mixture is located above the outer conductor.
  • the coaxial cable has an inner conductor 1 made of steel wire with a copper layer and a diameter of 0.643 mm and a chemically foamed insulation 2 with a diameter of 3.71 mm, into which two helical or spiral grooves 21 with the same orientation and a slope of 23 mm are incorporated on opposite sides of the insulation surface.
  • the furrows have a semicircular cross section with a diameter of 1.5 mm.
  • an outer conductor 3 made of dense braid made of tinned fine copper wires and thereon a pressed jacket 4 made of a soft PVC mixture, the diameter of the entire cable being 6.15 mm.
  • the coaxial cable has an inner conductor 1 made of copper wire with a diameter of 0.45 mm and a chemically foamed insulating sleeve with a diameter of 2.95 mm, which runs with two furrows 21 of rectangular cross section spirally along the cable axis with a pitch of 9 mm is provided. Their position remains on the opposite sides of the surface of the insulation 2, and the spiral grooves 21 have the same orientation.
  • Coaxial cables with insulating sleeves designed in this way are particularly suitable for local computer networks with a high propagation speed of the electromagnetic pulses. Their high and at the same time precise wave shortening factor also ensures the highest demands on the transmissions.
  • the cross-sectional shape and the slope of the furrows 21 can be selected or varied depending on the specific application of the cable.

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  • Communication Cables (AREA)
EP91100050A 1990-01-02 1991-01-02 Koaxialkabel Withdrawn EP0436489A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS19/90 1990-01-02
CS9019A CS275808B6 (en) 1990-01-02 1990-01-02 Coaxial cable for fast computer networks

Publications (1)

Publication Number Publication Date
EP0436489A1 true EP0436489A1 (de) 1991-07-10

Family

ID=5331624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91100050A Withdrawn EP0436489A1 (de) 1990-01-02 1991-01-02 Koaxialkabel

Country Status (4)

Country Link
EP (1) EP0436489A1 (cs)
CS (1) CS275808B6 (cs)
HU (1) HUT60062A (cs)
IL (1) IL96987A0 (cs)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688016A (en) * 1971-10-19 1972-08-29 Belden Corp Coaxial cable
EP0227268A2 (en) * 1985-11-15 1987-07-01 Junkosha Co. Ltd. Transmission line

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688016A (en) * 1971-10-19 1972-08-29 Belden Corp Coaxial cable
EP0227268A2 (en) * 1985-11-15 1987-07-01 Junkosha Co. Ltd. Transmission line

Also Published As

Publication number Publication date
IL96987A0 (en) 1992-03-29
HUT60062A (en) 1992-07-28
CS275808B6 (en) 1992-03-18
HU910002D0 (en) 1991-08-28
CS9000019A2 (en) 1991-07-16

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