EP1706877A1 - Cable coaxial - Google Patents

Cable coaxial

Info

Publication number
EP1706877A1
EP1706877A1 EP04761968A EP04761968A EP1706877A1 EP 1706877 A1 EP1706877 A1 EP 1706877A1 EP 04761968 A EP04761968 A EP 04761968A EP 04761968 A EP04761968 A EP 04761968A EP 1706877 A1 EP1706877 A1 EP 1706877A1
Authority
EP
European Patent Office
Prior art keywords
coaxial cable
outer conductor
cable according
tensile strength
sheath
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Withdrawn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
EP04761968A
Other languages
German (de)
English (en)
Inventor
Raoul Aemisegger
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.)
Huber and Suhner AG
Original Assignee
Huber and Suhner AG
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 Huber and Suhner AG filed Critical Huber and Suhner AG
Publication of EP1706877A1 publication Critical patent/EP1706877A1/fr
Withdrawn legal-status Critical Current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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H01B11/183—Co-axial cables with at least one helicoidally wound tape-conductor
    • 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
    • H01B11/1869—Construction of the layers on the outer side of the outer conductor

Definitions

  • the present invention relates to the field of coaxial cables. It relates to a coaxial cable, in particular for high frequencies in the range from 1 GHz to 65 GHz, according to the preamble of claim 1.
  • Coaxial cables have long been used for the transmission of high and highest frequencies in the MHz and GHz range, which in a coaxial arrangement comprise a central inner conductor and an outer conductor surrounding the inner conductor.
  • the space between the inner conductor and the outer conductor is filled with a dielectric.
  • the conductor arrangement is covered on the outside with a jacket.
  • the outer conductor is often formed by a wire mesh around which Giving cables the desired flexibility and, above all, the necessary axial tensile strength.
  • a further coaxial outer conductor is provided between the outside of the dielectric and the braided outer conductor, which comes from a lengthwise direction helically wound, electrically conductive tape, e.g. a thin metal band.
  • a coaxial cable is shown in terms of its structure in FIGS. 1 and 2 in side view and in cross section. The gradations in diameter of the various layers of the cable are not shown to scale for the sake of clarity.
  • the known coaxial cable 10 shown in FIGS. 1 and 2 has a central inner conductor 11 made of a silver-plated copper wire, which is enclosed by a dielectric 12 which, for example, consists of an extruded (unsintered, expanded) LD-PTFE (low-density polytetrafluoroethylene) ,
  • LD-PTFE low-density polytetrafluoroethylene
  • a silver-plated copper strip is wound around the dielectric 12 as the first outer conductor 13 in a helical shape, which forms a continuous conductor through a sufficient overlap of the turns 16.
  • a tubular braid Arranged around the first outer conductor 13 as a second outer conductor 14 is a tubular braid made of silver-plated copper wire, which is in direct electrical contact with the first outer conductor over the entire cable length and thus together with the first outer conductor electrically represents a single outer conductor.
  • the outer termination is formed by an electrically insulating sheath 15 which surrounds the second outer conductor 14 and which preferably consists of an extruded fluoroethylene propylene (FEP).
  • FEP extruded fluoroethylene propylene
  • a stranded or stranded inner conductor made of several thin individual wires can also be used without further notice. be used.
  • the applicant offers, for example, a coaxial cable under the type designation SUCOFLEX ® 104P.
  • a mesh made of non-conductive plastic fibers for example made of aramid, can be provided, which then only provides the necessary tensile strength of the cable.
  • a disadvantage of this known coaxial cable is that the expanded PTFE as dielectric 12 is not completely hard and the braid of the second outer conductor 14 or the tensile strength means does not exert a very great contact pressure on the inner layers of the cable.
  • the tightly banded first outer conductor 13 must open slightly and is no longer optimally in contact with the dielectric 12. It is then no longer a perfectly closed outer conductor, which results in reduced shielding attenuation and possibly also instability in the transmission properties of the cable.
  • a coaxial cable is known from JP-A-20057863, in which a dielectric (5) is arranged between the inner conductor and the wound outer conductor, which dielectric consists of an inner layer of a wound tetrafluoroethylene tape (3) and an outer layer (4) composed of thin-walled FEP. A wire mesh is not provided there.
  • JP-A11339570 a coaxial cable with a double outer conductor made of an inner, wound band and an outer wire mesh is known.
  • the two outer conductors are separated from each other by a thin, wrapped insulating tape. Since the insulating tape, like the inner outer conductor, is designed as a wound band, it has the same weaknesses as regards mechanical loads on the cable and can practically not contribute to mechanical stabilization of the inner outer conductor.
  • US-A-20030168240 discloses a coaxial cable with an inner conductor, a dielectric surrounding the inner conductor and an outer conductor surrounding the dielectric.
  • a metallized plastic strip is arranged between the dielectric and the outer conductor, which, with its outer metallization, forms an inner outer conductor and is helically wound around the dielectric.
  • the disadvantages with mechanical stress are the same as with the above-mentioned coaxial cable type SUCOFLEX ® 104.
  • the object is achieved by the entirety of the features of claim 1.
  • the essence of the invention is to provide additional stabilizing means for mechanical and / or electrical stabilization of the first outer conductor within the coaxial cable. These additional stabilizing agents can reliably prevent a deterioration in the shielding properties of the wound (banded) first outer conductor due to a mechanical load on the cable.
  • a preferred embodiment of the coaxial cable according to the invention is characterized in that the additional stabilizing means are arranged between the first outer conductor and the tensile strength means, that the additional stabilizing means comprise a coaxial sheathing of the first outer conductor, which is either made of an electrically insulating plastic, in particular a fluorinated ethylene propylene (FEP ), or consists of an electrically conductive plastic, and that the wrapping in Longitudinal cable direction is formed continuously and in particular by extrusion around the first outer conductor.
  • FEP fluorinated ethylene propylene
  • the rest of the structure of the coaxial cable is characterized in that the inner conductor is designed as a silver-plated copper wire, which preferably has a diameter in the range of 1 mm, or as a strand, in particular made of silver-plated copper wires, that the Dielectric consists of an extruded plastic, in particular of a low density polytetrafluoroethylene (PTFE), and has a wall thickness in the range of 1 mm, that the tensile strength means are designed as a second outer conductor, the tensile strength means in particular made of silver-plated copper wires with a minimal Coverage of 50% are braided, and the diameter of the Cu wires is approximately 1/10 mm, or the tensile strength means are braided from electrically insulating plastic fibers, in particular aramid fibers, and that the sheath is made from an electrically insulating plastic, in particular an extruded fluorinated one Ethylenpro pylene (FEP), and
  • the Dielectric consists
  • the first outer conductor preferably consists of a silver-plated copper tape, has a width of approximately 2.4 mm and a thickness of approximately 6/100 mm and is wound with an overlap of at least 40% to form the first outer conductor.
  • the first and second outer conductors are at least at the ends of the coaxial cable electrically connected.
  • Figure 1 is a side view of the structure of a coaxial cable according to the prior art, the gradations in diameter between the individual layers are not shown to scale.
  • FIG. 2 shows the cross section through the coaxial cable from FIG. 1;
  • FIG. 3 shows the structure of a coaxial cable according to a preferred embodiment of the invention in a representation comparable to FIG. 1;
  • FIG. 4 shows the cross section through the coaxial cable from FIG. 3.
  • the coaxial cable 20 has a structure which, in a coaxial arrangement, in a sequence from the inside to the outside, a central inner conductor 21, a dielectric 22 surrounding the inner conductor 21, a band-shaped first outer conductor 23 wound around the dielectric 22, and a sheath enclosing the first outer conductor 23 27, tensile strength means 24 in the form of a second, braided outer conductor and a sheath 25 enclosing the tensile strength means or the second outer conductor 24.
  • the envelope 27 is an extruded thin, in Continuous (one-piece) sheath in the longitudinal direction of the cable, which lies closely against the first outer conductor 23 and prevents the windings 26 of the first outer conductor 23 from slipping or opening when the coaxial cable is subjected to a mechanical load.
  • the covering 27 exerts an inward force on the band of the first outer conductor 23 and additionally restricts the axial freedom of movement of the band when the coaxial cable 20 bends. This makes it possible to keep the individual contact resistances from one strip position to the next, ie, between the individual turns 26, largely constant, and thus to stabilize the overall volume resistance of the first outer conductor 23. As a result, the shielding effect of the tape can be increased and there are ultimately significant positive effects on the electrical stability of the entire cable.
  • Inner conductor 21 solid, silver-plated copper wire with a diameter of 1.1 mm (or strand with comparable dimensions)
  • dielectric 22 extruded LD-PTFE with an outer diameter of 3.2 mm
  • Outer conductor 23 silver-plated copper tape with a width of 2.4 mm and a thickness of 0.06 mm; helically wrapped with 40% overlap; Outside diameter of 3.4 mm
  • Enclosure 27 solid extruded FEP with an outer diameter of 3.7 mm outer conductor 24: braid made of soft silver-plated copper wire; Single wire diameter of 0.1 mm; 90% coverage; Outside diameter of 4.1 mm Jacket 25: solid extruded FEP with an outer diameter of 4.5 mm.
  • the structure of the coaxial cable according to the invention can easily be used for cables with outside diameters in the range of approximately 2 to 8 mm. The individual dimensions must then be adjusted accordingly.
  • the two outer conductors 23 and 24 are first electrically insulated from one another by the insulating sheath 27. If a coaxial cable of finite length is assembled and provided with connectors or other connection elements at the ends, care must be taken to ensure that the two outer conductors 23, 24 are electrically connected to one another in the end regions. This can be done, for example, by a special configuration of the plug connectors or connection elements. However, it is also possible to work with an electrically conductive covering 27. The two outer conductors 23, 24 are then no longer insulated from one another.

Landscapes

  • Communication Cables (AREA)

Abstract

L'invention concerne un câble coaxial (20), notamment pour hautes fréquences dans la plage s'étendant de 1 GHz à 65 GHz. Ce câble comprend un conducteur intérieur (21) central, un diélectrique (22) entourant le conducteur intérieur (21) de manière coaxiale, un premier conducteur extérieur (23) en forme de bande, enroulé de façon hélicoïdale avec chevauchements autour du diélectrique, des éléments de résistance à la traction (24) tressés, entourant le premier conducteur extérieur (23) de manière coaxiale, et une gaine enveloppant de manière coaxiale les éléments de résistance à la traction (24). L'invention vise à maintenir constantes les propriétés de transmission du câble. A cet effet, des éléments de stabilisation (27) supplémentaires servent à la stabilisation électrique et/ou mécanique du premier conducteur extérieur (23) dans le câble coaxial (20).
EP04761968A 2004-01-19 2004-10-18 Cable coaxial Withdrawn EP1706877A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH682004 2004-01-19
PCT/CH2004/000628 WO2005069314A1 (fr) 2004-01-19 2004-10-18 Cable coaxial

Publications (1)

Publication Number Publication Date
EP1706877A1 true EP1706877A1 (fr) 2006-10-04

Family

ID=34754188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04761968A Withdrawn EP1706877A1 (fr) 2004-01-19 2004-10-18 Cable coaxial

Country Status (4)

Country Link
US (1) US20070159278A1 (fr)
EP (1) EP1706877A1 (fr)
CN (1) CN1906707A (fr)
WO (1) WO2005069314A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007179985A (ja) * 2005-12-28 2007-07-12 Junkosha Co Ltd 同軸ケーブル
US8657620B2 (en) 2011-12-22 2014-02-25 General Electric Company Connector assembly having a cable clamp coupled to a collet including an arbor
US9712905B2 (en) 2012-06-20 2017-07-18 Apple Inc. Headsets with non-occluding earbuds
US8971561B2 (en) 2012-06-20 2015-03-03 Apple Inc. Earphone having a controlled acoustic leak port
US9258663B2 (en) 2012-09-07 2016-02-09 Apple Inc. Systems and methods for assembling non-occluding earbuds
CH707152A8 (de) * 2012-10-26 2014-07-15 Huber+Suhner Ag Mikrowellenkabel sowie Verfahren zum Herstellen und Anwendung eines solchen Mikrowellenkabels.
CN104143677A (zh) * 2014-07-11 2014-11-12 安徽宏源特种电缆集团有限公司 一种射频低损耗细同轴电缆
CN104600407A (zh) * 2015-02-06 2015-05-06 江苏通鼎光电科技有限公司 一种具有抗压屏蔽功能的射频同轴电缆
CN106297995B (zh) * 2015-05-20 2018-06-19 铄程智能科技（上海）有限公司 一种高柔性运动电缆结构
JP6654739B2 (ja) * 2017-09-14 2020-02-26 株式会社フジクラ 漏洩同軸ケーブル
CN113724934A (zh) * 2021-08-11 2021-11-30 广东速联科技术有限公司 同轴电缆排线、挤出模头及生产工艺

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408089A (en) * 1979-11-16 1983-10-04 Nixon Charles E Extremely low-attenuation, extremely low radiation loss flexible coaxial cable for microwave energy in the gigaHertz frequency range
US4626810A (en) * 1984-10-02 1986-12-02 Nixon Arthur C Low attenuation high frequency coaxial cable for microwave energy in the gigaHertz frequency range
US4719320A (en) * 1986-04-28 1988-01-12 Times Fiber Communications, Inc. Coaxial cable with coil supported braid structure
US5061823A (en) * 1990-07-13 1991-10-29 W. L. Gore & Associates, Inc. Crush-resistant coaxial transmission line
US5298682A (en) * 1992-08-20 1994-03-29 Wireworld By David Salz, Inc. Optimized symmetrical coaxial cable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005069314A1 *

Also Published As

Publication number Publication date
CN1906707A (zh) 2007-01-31
WO2005069314A1 (fr) 2005-07-28
US20070159278A1 (en) 2007-07-12

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