EP3279902A1 - Koaxialkabel und verfahren zur herstellung eines koaxialkabels - Google Patents

Koaxialkabel und verfahren zur herstellung eines koaxialkabels Download PDF

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Publication number
EP3279902A1
EP3279902A1 EP16182824.9A EP16182824A EP3279902A1 EP 3279902 A1 EP3279902 A1 EP 3279902A1 EP 16182824 A EP16182824 A EP 16182824A EP 3279902 A1 EP3279902 A1 EP 3279902A1
Authority
EP
European Patent Office
Prior art keywords
cable
absorbing element
inner conductor
stress absorbing
stress
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Withdrawn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
EP16182824.9A
Other languages
English (en)
French (fr)
Inventor
Erhard Mahlandt
Andre Doll
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.)
Nokia Shanghai Bell Co Ltd
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
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 Alcatel Lucent Shanghai Bell Co Ltd filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to EP16182824.9A priority Critical patent/EP3279902A1/de
Priority to CN201710659689.2A priority patent/CN107689268A/zh
Publication of EP3279902A1 publication Critical patent/EP3279902A1/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Withdrawn legal-status Critical Current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
    • 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
    • H01B11/1895—Particular features or applications
    • 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
    • H01B11/1843—Construction of the insulation between the conductors of tubular structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/189—Radial force absorbing layers providing a cushioning effect
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0216—Two layers

Definitions

  • the invention relates to a coaxial cable comprising an inner conductor and an outer conductor which is arranged radially outside of said inner conductor and which is electrically isolated from said inner conductor.
  • the invention further relates to a method of manufacturing a coaxial cable.
  • Coaxial cables may be used for transmitting electrical signals, especially in the radio frequency, RF, range, e.g. for supplying telecommunications devices with signals in a frequency range between some MHz (Megahertz) up to several GHz (Gigahertz).
  • the inner conductor and the outer conductor comprise or are made of an electrically conductive material such as e.g. copper.
  • the inner and/or outer conductor of conventional coaxial cables nevertheless usually comprise a comparatively large material thickness or wall thickness, respectively, which is particularly larger than required from an RF signal transmission standpoint, thus requiring large amounts of costly resources such as copper.
  • this object is achieved by arranging at least one stress absorbing element for absorbing mechanical stress radially between said inner conductor and said outer conductor.
  • the at least one stress absorbing element can absorb mechanical stress applied to the cable thus protecting the inner conductor from excessive mechanical stress that would e.g. lead to a destruction of the inner conductor. This way, it is possible to reduce a material thickness for both the outer conductor and the inner conductor thus saving precious resources such as copper material and also reducing the weight of the cable per unit length.
  • the at least one stress absorbing element may absorb mechanical stresses of the following types: 1. a 360° radial force which may e.g. be applied to the cable or its components during a manufacturing process, especially during a manufacturing process of an optional dielectric member of the cable, 2. a radial force along a (single) axis, which e.g. corresponds with a crush resistance of the cable, for instance if the cable is squeezed between parallel plates, and 3. bending.
  • said stress absorbing element comprises or is made of an electrically isolating material, whereby advantageously an electrical isolation between the inner conductor and the outer conductor of the cable is attained, while at the same time absorbing mechanical stress and e.g. protecting the inner conductor therefrom.
  • electrically insulating material may also be used to isolate the inner conductor from the outer conductor, e.g. in form of a dielectric layer radially inside the outer conductor.
  • said stress absorbing element comprises or is made of a material which comprises a yield stress Rp0.2 of about 20 Newton per square millimeter, N/mm 2 , or greater, preferably about 25 N/mm 2 or greater, which enables to provide a cable configuration with a particularly high stability.
  • said stress absorbing element comprises or is made of a solid plastic material, particularly polyethylene or polypropylene, which reduces costs and enables an efficient manufacturing process, while providing a good mechanical stability required for absorbing mechanical stress.
  • said stress absorbing element comprises a tubular, e.g. hollow circular cylindrical, shape with a basically annular shaped cross-section, wherein said cross-section has an area of at least 10 square millimeter, mm 2 , preferably at least 15 mm 2 .
  • the hollow circular cylindrical shape is arranged radially between the inner and outer conductor, whereby a coaxial configuration of said conductors and the stress absorbing element is attained.
  • other components may optionally be provided radially between the stress absorbing element and the inner conductor and/or radially between the stress absorbing element and the outer conductor.
  • said stress absorbing element comprises a geometric moment of inertia of about 185 mm 4 or greater, which ensures a sufficient rigidity and stability for a wide variety of applications of the cable.
  • said inner conductor comprises tubular shape, which provides an increased radially outer surface as compared with inner conductors of the solid wire type, thus effecting a comparatively low electrical resistance and comparatively low current densities.
  • said stress absorbing element also comprises tubular shape, wherein preferably a ratio of a radial wall thickness of said stress absorbing element and said inner conductor ranges between 30:1 and 4:1, preferably between 20:1 and 5:1.
  • a ratio of a radial wall thickness of said stress absorbing element and said inner conductor ranges between 30:1 and 4:1, preferably between 20:1 and 5:1.
  • an adhesive layer is arranged radially between said inner conductor and said stress absorbing element, whereby a further stabilization of the involved cable components relative to each other is attained.
  • the adhesive layer may firmly couple the inner conductor to the stress absorbing element to e.g. also prevent an axial displacement of these components with respect to each other, which may e.g. arise from mounting the cable in a vertical arrangement.
  • said adhesive layer has a comparatively small layer thickness, particularly a layer thickness of 0.5 millimeter or less, preferably of 0.2 millimeter or less.
  • said adhesive layer may comprise or consist of a polymer material, e.g. an EVA (Ethylene-vinyl acetate) copolymer.
  • EVA Ethylene-vinyl acetate
  • a dielectric layer is arranged radially between said stress absorbing element and said outer conductor.
  • the cable comprises at least one dielectric layer, which preferably coaxially surrounds the inner conductor, wherein the dielectric may e.g. comprise air or a plastic material.
  • said dielectric layer may comprise Polyethylene (PE) material, particularly foamed PE material.
  • said outer conductor is a corrugated tube, preferably comprising copper or made of copper, which facilitates bending of the cable.
  • the inner conductor is protected from inadmissible mechanical stress that could result from such bending by means of the stress absorbing element.
  • a further solution to the object of the present invention is provided by a method of manufacturing a coaxial cable, comprising the steps of: providing an inner conductor and an outer conductor which is arranged radially outside of said inner conductor and which is electrically isolated from said inner conductor, and providing at least one stress absorbing element for absorbing mechanical stress radially between said inner conductor and said outer conductor.
  • Figure 1 schematically depicts a cross-sectional view of a coaxial cable 100 according to an embodiment.
  • the cable 100 comprises an inner conductor 110 and an outer conductor 120 which is arranged radially outside of the inner conductor 110.
  • the inner conductor 110 and/or the outer conductor 120 may comprise copper material or may be made of copper material, particularly pure copper.
  • At least one stress absorbing element 130 for absorbing mechanical stress is arranged radially between the inner conductor 110 and the outer conductor 120. I.e., the at least one stress absorbing element 130 is placed radially outside the inner conductor 110 and radially inside the outer conductor 120.
  • the at least one stress absorbing element 130 can absorb mechanical stress applied to the cable 100 thus protecting the inner conductor 110 from excessive mechanical stress that would e.g. lead to a destruction of the inner conductor 110. This way, it is possible to reduce a material thickness for the inner conductor 110 thus saving precious resources such as copper material and also reducing the weight of the cable 100 per unit length.
  • the at least one stress absorbing element 130 may absorb mechanical stresses of the following types: 1. a 360° radial force which may e.g. be applied to the cable 100 or its components during a manufacturing process, especially during a manufacturing process of an optional dielectric member (not shown in Fig. 1 ) of the cable, 2. a radial force along a (single) axis, which e.g. corresponds with a crush resistance of the cable 100, for instance if the cable 100 is squeezed between parallel plates, and 3. Bending, which e.g. regularly occurs during deployment of the cable 100 in the field.
  • an adhesive layer 140 may be provided radially between the inner conductor 110 and the stress absorbing element 130, whereby a further stabilization of the involved cable components relative to each other is attained.
  • the adhesive layer 140 may firmly couple the inner conductor to the stress absorbing element to e.g. also prevent an axial displacement of these components with respect to each other, which may e.g. arise from mounting the cable in a vertical arrangement.
  • the adhesive layer 140 may be provided for sealing the inner conductor 110.
  • said adhesive layer 140 has a comparatively small layer thickness (as seen in a radial direction), particularly a layer thickness of 0.5 millimeter or less, preferably of 0.2 millimeter or less.
  • said adhesive layer 140 may comprise or consist of a polymer material, e.g. an EVA (Ethylene-vinyl acetate) copolymer.
  • EVA Ethylene-vinyl acetate
  • said stress absorbing element 130 comprises or is (completely) made of an electrically isolating material, whereby advantageously an electrical isolation between the inner conductor 110 and the outer conductor 120 of the cable is attained, while at the same time absorbing mechanical stress and e.g. protecting the inner conductor 110 therefrom.
  • said stress absorbing element 130 comprises or is made of a material which comprises a yield stress Rp0.2 of about 20 Newton per square millimeter, N/mm 2 , or greater, preferably about 25 N/mm 2 or greater, which enables to provide a cable configuration with a particularly high stability.
  • said stress absorbing element 130 comprises or is made of a solid plastic material, particularly polyethylene or polypropylene, which reduces costs and enables an efficient manufacturing process, while providing a good mechanical stability required for absorbing mechanical stress.
  • said stress absorbing element comprises a tubular, e.g. hollow circular cylindrical, shape with a basically annular shaped cross-section, as depicted by Fig. 1 , wherein said cross-section has an area of at least 10 square millimeter, mm 2 , preferably at least 15 mm 2 .
  • the hollow circular cylindrical shape is arranged radially between the inner and outer conductors 110, 120, whereby a coaxial configuration of said conductors 110, 120 and the stress absorbing element 130 is attained.
  • other components may optionally be provided radially between the stress absorbing element 130 and the inner conductor 110 and/or radially between the stress absorbing element 130 and the outer conductor 120, which is, however, not shown in Fig. 1 .
  • said stress absorbing element comprises a geometric moment of inertia of about 185 mm 4 or greater, which ensures a sufficient rigidity and stability for a wide variety of applications of the cable 100.
  • said inner conductor 110 comprises tubular shape, cf. Fig. 1 , which provides an increased radially outer surface as compared with inner conductors of the solid wire type.
  • said stress absorbing element 130 also comprises tubular shape, wherein a ratio of a radial wall thickness (measured in a radial direction) of said stress absorbing element 130 and said inner conductor ranges between 30:1 and 4:1, preferably between 20:1 and 5:1.
  • a ratio of a radial wall thickness (measured in a radial direction) of said stress absorbing element 130 and said inner conductor ranges between 30:1 and 4:1, preferably between 20:1 and 5:1.
  • a dielectric layer 150 is arranged radially between said stress absorbing element 130 and said outer conductor 120.
  • an optional adhesive layer 140 as depicted by Fig. 1 with a dashed line is omitted in Fig. 2 for the sake of clarity.
  • the dielectric layer 150 between the stress absorbing element 130 and the outer conductor 120 may comprise Polyethylene (PE) material, particularly foamed PE material.
  • PE Polyethylene
  • said outer conductor 120 is a corrugated tube, preferably comprising copper or made of copper.
  • the cable 100b may comprise an outer jacket 160.
  • the outer jacket 160 may comprise or may be made of an electrically insulating material such as a PE material.
  • the cables 100, 100a of Fig. 1, 2 may, according to some embodiments, also comprise such an outer jacket 160.
  • the inner conductor 110 is made of copper and comprises a basically tubular shape, i.e. hollow circular cylinder shape.
  • an outer diameter of the inner conductor 110 may range between about 5 mm and about 20 mm.
  • the outer diameter of the inner conductor 110 equals about 9 mm, wherein a wall thickness of said inner conductor 110 is about 0.1 mm.
  • Such comparatively low wall thickness is advantageously enabled by the stress absorbing element 130 according to the embodiments.
  • the outer diameter of the stress absorbing element 130 which presently comprises PE material, equals about 10 mm, with a wall thickness of about 1 mm.
  • the outer conductor 120 may be a corrugated copper tube, and an outer diameter of said outer conductor 120 may equal about 25 mm.
  • the outer jacket 160 comprises PE material and has an outer diameter of about 28 mm.
  • Figure 4 depicts a further embodiment 100c of a coaxial cable, wherein the stress absorbing element 130 is arranged radially between two tubular layers 150a, 150b of dielectric material such as e.g. PE foam material.
  • dielectric material such as e.g. PE foam material.
  • the inner conductor 110 is surrounded radially outside with a first PE foam layer 150a
  • the stress absorbing element 130 is surrounded radially outside with a second PE foam layer 150b.
  • other materials than e.g. PE foam may be used for forming one or more of the dielectric layer(s) 150a, 150b, for example air.
  • the dimensions (especially, the outer diameter and/or the wall thickness) of the inner conductor 110 may primarily be chosen depending on requirements of RF signal transmissions (such as frequency (range), current density), wherein one or few multiples of the skin depth at a considered operating frequency (e.g., a center operating frequency) are sufficient from an RF signal transmission point of view, as the penetration depth of RF currents is usually comparatively low (and frequency dependent, as is well known to the skilled man).
  • RF signal transmissions such as frequency (range), current density
  • a considered operating frequency e.g., a center operating frequency
  • the use of copper material (or other electrically conductive material especially for constructing the inner conductor 110) may advantageously be restricted to what is required for said RF signals to be transmitted over the cable 100, 100a, 100b, 100c and is especially not required to be chosen depending on a desired mechanical stability of the cable, as this issue is dealt with by the stress absorbing element 130 according to the embodiments.
  • the stress absorbing element 130 absorbs mechanical stress applied to the cable 100, 100a, 100b, 100c and prevents the radially inner components of the cable (as seen from the stress absorbing element 130), especially the inner conductor 110, to support such stress absorbing function.
  • the principle according to the embodiments advantageously enables to significantly reduce the content of electrically conductive material, e.g. copper, thus also reducing weight and cost of the cable, without any impact on the RF signal transmission performance of the cables. Further, in view of the reduced copper content, cables according to the embodiments would be less attractive to thieves.
  • electrically conductive material e.g. copper
  • a further solution to the object of the present invention is provided by a method of manufacturing a coaxial cable, comprising the steps of: providing an inner conductor and an outer conductor which is arranged radially outside of said inner conductor and which is electrically isolated from said inner conductor, and providing at least one stress absorbing element for absorbing mechanical stress radially between said inner conductor and said outer conductor.
  • Figure 5 schematically depicts a flow-chart of an embodiment of said method.
  • the inner conductor 110 Fig. 1
  • the outer conductor 120 is provided
  • the stress absorbing element 130 Fig. 1
  • the precise sequence of these steps 200, 210, 220 is not necessarily as exemplarily mentioned above with reference to Fig. 5 . Rather, according to some embodiments, e.g. steps 200, 210, 220 may substantially be performed simultaneously or in any other sequence.
  • any block diagrams herein represent conceptual views of illustrative circuitry embodying the principles of the invention.
  • any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Communication Cables (AREA)
EP16182824.9A 2016-08-04 2016-08-04 Koaxialkabel und verfahren zur herstellung eines koaxialkabels Withdrawn EP3279902A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16182824.9A EP3279902A1 (de) 2016-08-04 2016-08-04 Koaxialkabel und verfahren zur herstellung eines koaxialkabels
CN201710659689.2A CN107689268A (zh) 2016-08-04 2017-08-04 同轴电缆和制造同轴电缆的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16182824.9A EP3279902A1 (de) 2016-08-04 2016-08-04 Koaxialkabel und verfahren zur herstellung eines koaxialkabels

Publications (1)

Publication Number Publication Date
EP3279902A1 true EP3279902A1 (de) 2018-02-07

Family

ID=56802248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16182824.9A Withdrawn EP3279902A1 (de) 2016-08-04 2016-08-04 Koaxialkabel und verfahren zur herstellung eines koaxialkabels

Country Status (2)

Country Link
EP (1) EP3279902A1 (de)
CN (1) CN107689268A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326551B1 (en) * 1997-08-14 2001-12-04 Commscope Properties, Llc Moisture-absorbing coaxial cable and method of making same
US20020088641A1 (en) * 2001-01-08 2002-07-11 Murga Patricio G. Insulating structure for a coaxial cable and method for applying the same
DE202008005448U1 (de) * 2008-02-25 2008-08-07 Vodafone Holding Gmbh Mobilfunkstation und Hybridkabel für eine Mobilfunkstation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2758949Y (zh) * 2004-12-09 2006-02-15 江苏享鑫科技股份有限公司 改良的7/8"波纹管外导体射频同轴电缆
CN101694902A (zh) * 2009-09-28 2010-04-14 江苏东强股份有限公司 通信基站用射频同轴电缆
CN102592743B (zh) * 2011-01-07 2014-05-07 珠海汉胜科技股份有限公司 一种同轴电缆及其制造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326551B1 (en) * 1997-08-14 2001-12-04 Commscope Properties, Llc Moisture-absorbing coaxial cable and method of making same
US20020088641A1 (en) * 2001-01-08 2002-07-11 Murga Patricio G. Insulating structure for a coaxial cable and method for applying the same
DE202008005448U1 (de) * 2008-02-25 2008-08-07 Vodafone Holding Gmbh Mobilfunkstation und Hybridkabel für eine Mobilfunkstation

Also Published As

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