EP0141961B1 - Cable electrique coaxial rayonnant - Google Patents

Cable electrique coaxial rayonnant Download PDF

Info

Publication number
EP0141961B1
EP0141961B1 EP84110809A EP84110809A EP0141961B1 EP 0141961 B1 EP0141961 B1 EP 0141961B1 EP 84110809 A EP84110809 A EP 84110809A EP 84110809 A EP84110809 A EP 84110809A EP 0141961 B1 EP0141961 B1 EP 0141961B1
Authority
EP
European Patent Office
Prior art keywords
cable
sheath
axis
conductor
outer 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
Application number
EP84110809A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0141961A1 (fr
Inventor
Jean-Loup Bocher
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.)
Cables de Lyon SA
Original Assignee
Cables de Lyon SA
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 Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of EP0141961A1 publication Critical patent/EP0141961A1/fr
Application granted granted Critical
Publication of EP0141961B1 publication Critical patent/EP0141961B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/203—Leaky coaxial lines

Definitions

  • the present invention relates to a radiating coaxial electric cable, comprising a conductive core, a cellular dielectric, an outer conductor provided with windows for passage of electromagnetic radiation, and an outer insulating sheath.
  • the radiation passage windows of known cables are formed either by slots, longitudinal or at an angle with the axis of the cable, or by successions of holes aligned on segments parallel to the axis of the cable. Their linear weakening is however disturbed by the value of the coupling factor, so that they are perfectly satisfactory only for determined coupling factors. Their radiation in peak value is also limited.
  • Radiant cables having slots at an angle to the axis of the cable are particularly dissipative, since these slots cut the surface currents which flow in the outer conductor of the cable and therefore greatly increase the attenuation.
  • Cables with successive holes aligned on segments parallel to the cable axis have a lower reduction, but the arrangement of these segments parallel to the axis creates a non-uniform radiation pattern, which can be annoying. in many applications.
  • the object of the present invention is to provide a radiating coaxial electric cable whose linear loss does not depend on the value of the coupling factor, which has better radiation in peak value, with a more uniform distribution, and for amplitudes of less coupling than known cables, and whose measurement of echo voltages (reflectometry) is very good.
  • the cable according to the present invention is characterized in that the windows for the passage of radiation from its external conductor consist of successive series of holes aligned along a helix segment.
  • the holes forming radiation passage windows are circular.
  • the outer conductor is formed by an embossed strip.
  • Its sheath is made of a synthetic resin provided with a mineral additive making it non-propagating of a flame.
  • the sheath is free of halogenated additives.
  • the apparent specific mass of the cell dielectric is between 0.25 and 0.50 g / cm 3 .
  • Its outer sheath is connected to a member carrying a parallel axis within.
  • H t being the tangential magnetic field at the center of the opening and c the speed of light in a vacuum.
  • W the energy conveyed in the cable.
  • the radiation of the cable has a circular diagram and is uniform in all directions if one neglects the wall effect due to obstacles located near the cable.
  • the distance between the holes must be chosen so that the fields radiated by each add up.
  • the radiation of the leaky cable will be effective for the carrier signals whose wavelength in air satisfies the relationships: and p being an integer constant and er, the relative permittivity of the primary insulator of the coaxial cable.
  • the radiation may occur in the fundamental mode or in higher order modes.
  • This cable comprises a conductive core 1 of copper or aluminum with a helical groove. This is surrounded by a low loss cellular dielectric 2 of polyethylene with a specific mass of between 0.25 and 0.50 g / cm 3 .
  • the outer conductor is formed of an embossed copper strip 3, pierced with holes 6 distributed over helix segments, the pitch and the angle relative to the axis of the series of holes being chosen as a function of the frequency d 'use.
  • the holes shown are circular, but they could also be rectangular or oval in shape.
  • the external conductor is surrounded by a protective sheath 4 made of polyvinyl chloride, added with a mineral filler making it non-propagating of the flame, but without halogenated fire-retardant additive, which would generate a release of halogen in the event of fire.
  • the entire cable is supported by a support element 5 with a steel core 7, connected to the cable sheath.
  • a cable of this kind with outside diameters 45 mm and inside diameters 18.5 mm, provided with 9 mm diameter holes spaced 15 mm apart, distributed over a 350 mm pitch helix, making an angle of 20 ° with the axis of the cable, has a coupling efficiency of -53 dB at 2 m in free space for a frequency of 450 MHz, with a linear attenuation of 23 dB / km. Its characteristic impedance is close to 50 ohms.

Landscapes

  • Waveguide Aerials (AREA)
  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
  • Near-Field Transmission Systems (AREA)
EP84110809A 1983-09-15 1984-09-11 Cable electrique coaxial rayonnant Expired EP0141961B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8314710 1983-09-15
FR8314710A FR2552272B1 (fr) 1983-09-15 1983-09-15 Cable electrique coaxial rayonnant

Publications (2)

Publication Number Publication Date
EP0141961A1 EP0141961A1 (fr) 1985-05-22
EP0141961B1 true EP0141961B1 (fr) 1989-01-18

Family

ID=9292257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110809A Expired EP0141961B1 (fr) 1983-09-15 1984-09-11 Cable electrique coaxial rayonnant

Country Status (5)

Country Link
US (1) US4625187A (ja)
EP (1) EP0141961B1 (ja)
JP (1) JPS6086901A (ja)
DE (1) DE3476302D1 (ja)
FR (1) FR2552272B1 (ja)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62276904A (ja) * 1986-02-12 1987-12-01 Hitachi Cable Ltd 耐火性漏洩同軸ケ−ブル
GB2235336B (en) * 1989-06-23 1994-05-11 Hunting Eng Ltd Communication via leaky cables
FR2685549B1 (fr) * 1991-12-19 1994-01-28 Alcatel Cable Ligne haute frequence rayonnante.
FR2690280A1 (fr) * 1992-04-15 1993-10-22 Alcatel Cable Dispositif rayonnant à large bande passante.
US5717411A (en) * 1995-04-19 1998-02-10 Andrew Corporation Radiating waveguide and radio communication system using same
US5809429A (en) * 1995-09-22 1998-09-15 Andrew Corporation Radiating coaxial cable and radio communication system using same
CA2239642C (en) * 1997-06-26 2001-05-29 Geza Dienes Antenna for radiating cable-to-vehicle communication systems
FR2769135B1 (fr) * 1997-10-01 1999-12-03 Telecommunications Sa Cable coaxial rayonnant
US5898350A (en) * 1997-11-13 1999-04-27 Radio Frequency Systems, Inc. Radiating coaxial cable and method for making the same
US6480163B1 (en) 1999-12-16 2002-11-12 Andrew Corporation Radiating coaxial cable having helically diposed slots and radio communication system using same
US6624358B2 (en) 2001-12-13 2003-09-23 Andrew Corporation Miniature RF coaxial cable with corrugated outer conductor
EP2355246B1 (en) * 2010-01-28 2018-11-28 Alcatel Lucent Radiating cable with mounting rail
US9270071B2 (en) 2013-03-13 2016-02-23 International Business Machines Corporation Microwave connector with filtering properties
US9300029B2 (en) * 2013-03-15 2016-03-29 International Business Machines Corporation Coaxial transmission line slot filter with absorptive matrix
EP3886121A1 (en) * 2020-03-25 2021-09-29 Lapp Engineering & Co. Fire-resistant cable

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633532A (en) * 1948-02-06 1953-03-31 Int Standard Electric Corp Helically slotted cylindrical antenna
US2724774A (en) * 1952-06-03 1955-11-22 Rca Corp Slotted cylinder antenna
US2947988A (en) * 1955-03-29 1960-08-02 Univ Ohio State Res Found Traveling wave antenna
DE2230280A1 (de) * 1972-06-21 1974-01-17 Licentia Gmbh Offener wellenleiter zur breitbandigen funkversorgung
GB1424685A (en) * 1973-01-25 1976-02-11 Bicc Ltd Electric cables
BE834291A (fr) * 1975-10-07 1976-02-02 Systeme de radiocommunications pour milieux confines
JPS5276814A (en) * 1975-12-23 1977-06-28 Japanese National Railways<Jnr> Transmission line leakage coaxial cable
GB1597125A (en) * 1977-08-24 1981-09-03 Bicc Ltd Radiating cables
CA1079504A (en) * 1978-10-13 1980-06-17 Control Data Canada Method of producing coaxial cable
US4339733A (en) * 1980-09-05 1982-07-13 Times Fiber Communications, Inc. Radiating cable
GB2105521A (en) * 1981-08-12 1983-03-23 Univ Surrey Antenna

Also Published As

Publication number Publication date
EP0141961A1 (fr) 1985-05-22
DE3476302D1 (en) 1989-02-23
JPS6086901A (ja) 1985-05-16
US4625187A (en) 1986-11-25
FR2552272A1 (fr) 1985-03-22
FR2552272B1 (fr) 1986-04-11

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