EP1047084A2 - Koaxiales Hochfrequenzkabel - Google Patents
Koaxiales Hochfrequenzkabel Download PDFInfo
- Publication number
- EP1047084A2 EP1047084A2 EP00106427A EP00106427A EP1047084A2 EP 1047084 A2 EP1047084 A2 EP 1047084A2 EP 00106427 A EP00106427 A EP 00106427A EP 00106427 A EP00106427 A EP 00106427A EP 1047084 A2 EP1047084 A2 EP 1047084A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- cable according
- following
- surrounding
- insulation
- 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.)
- Granted
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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 present invention relates to a coaxial radio frequency cable with a central conductor surrounding multilayer insulation made of polymeric materials and with an electrical shield enclosing the insulation, which is covered by a outer covering is covered.
- Cables of the generic type are well known, they can be found in the High-frequency technology for the transmission of analog and digital signals in general Application.
- a known coaxial high-frequency cable (US 5,817,981)
- the insulation surrounding the central conductor consists of two layers, which are: differ in the dielectric constant. So the dielectric constant is the second layer larger than that of the first layer, wherein the first layer by a Polyethylene and the second layer is formed by a polyimide.
- the object of the invention is therefore based on finding a way, despite the required minor exterior Dimensions further increase the transmission properties of such micro-coaxial cables improve, especially the capacity of the transmission path to a minimum to reduce.
- the individual Layers in the insulation consist of fluoropolymers, with at least one of the central conductor enclosing the first layer from a melt processable fluoropolymer and an outer second layer made of one of the Melt non-processable fluoropolymer, the second layer being porous and with the surrounding shield is non-positively connected by use of two or more fluoropolymer insulation layers for the dielectric of the cable according to the invention it is possible to change the dielectric constant of the insulation adapt to the respective requirements, especially low constants set without resorting to foamed insulation as a whole.
- the outer dimensions of the cable are extremely small.
- extrudable fluoropolymers are e.g. the Tetrafluoroethylene (hexafluoropropylene copolymer (FEP), the tetrafluoroethylene ⁇ Perfluoroalkylvenyl ether copolymer (TFA / PFA) or one under the trade name HYFLON MFA distributed fluoropolymer.
- FEP hexafluoropropylene copolymer
- TFA / PFA Perfluoroalkylvenyl ether copolymer
- HYFLON MFA distributed fluoropolymer e.g. the Tetrafluoroethylene (hexafluoropropylene copolymer (FEP), the tetrafluoroethylene ⁇ Perfluoroalkylvenyl ether copolymer (TFA / PFA) or one under the trade name HYFLON MFA distributed fluoropolymer.
- This first layer can be compact trained but also foamed.
- the second insulating layer adjoining the first is porous, also known as a microporous structure (EP 0489 752 B1).
- the wall thickness of this layer is approximately between 0.8 and 0.2, preferably between 0.4 and 0.3 mm. It is advantageous if the dielectric constant of the first layer is greater than that of the second layer.
- tapes made of polytetrafluoroethylene are preferably used, such a tape is stretched and sintered in order to ensure the porous character of the tape. It depends on the microporosity of the strip material. To ensure this, the tape, made from a so-called.
- a stretching process with a stretching rate of up to 2000%, preferably between 300 and 1000%. The stretching usually takes place in the direction of the belt, but it can also be carried out transversely to it, for example if the porosity of the belt or film is to be increased.
- the mechanical strength of the strip or film material is increased by a sintering process which takes place simultaneously with the stretching process or also after the stretching process.
- the thickness of the stretched and advantageously also sintered band or corresponding film is then 15 to 250 microns, preferably 30 to 100 ⁇ m.
- At least the outermost band layer with the surface of the electrical shield is non-positively connected.
- an applied to the tape winding such as sprayed on, hot melt adhesive for the frictional connection between a conductive plastic or metal foil, or in a continuation of the invention in that an adhesive-coated metal foil is used as the electrical shield.
- the frictional connection between the porous outermost layer of the Insulation and the conductive shielding are usually done during extrusion the outer jacket of the cable due to its heat content. This is especially true when, as also provided according to the invention, the outer jacket from a Fluoropolymer with a correspondingly high melting / extrusion temperature of e.g. B. 350 ° C exists. Such temperatures in the outer area of the cable lead to Melt the adhesive layer between porous insulation and electrical Shielding, the adhesive then penetrates the pores e.g. B. at least the top one Location of a wrapping made of stretched film, which is the second layer of the Cable insulation is used.
- Coaxial cable is the mechanically strong all-over connection between z. B. one Metal foil and the outermost porous insulating layer of the cable.
- the shielding of the cable is advantageously formed in two layers.
- Above the described adhesive-coated metal foil or a metallized Plastic film is an outer layer in the form of a metal wire layer or one Braid provided from individual metal wires.
- the Outer jacket based on fluoropolymers or halogen-free, flame-retardant or flame-retardant, anti-corrosive polymer materials, e.g. Polyolefins, elastomers or thermoplastic rubber.
- the two-layer shielding has the advantage an improved shielding effect combined with high flexibility of the cable.
- a solid copper wire is provided as the central conductor 1, advantageously tin-plated or silver-plated. Instead of a solid copper wire you can of course also use a strand made of bare or tinned copper wires. in the The present exemplary embodiment is the diameter of the central conductor about 0.254 mm.
- the central conductor 1 is enclosed by the inner or first Layer 2, here from a melt processable i.e. extruded Fluoropolymer, e.g. from a tetrafluoroethylene / hexafluoropropylene copolymer (FEP).
- This first insulating layer has, for example, a wall thickness of 0.225 mm, it is of compact design in the exemplary embodiment.
- the broad structure of the cable shows the second and thus outer insulating layer 3 consists of a winding with a thickness of e.g. 0.3 mm from several layers one made by paste extrusion and then rolling Polytetrafluoroethylene tape that is stretched after being rolled out and one Has been subjected to heat treatment for the purpose of sintering.
- the stretching process created pores in the tape serve as in the winding Air chambers to reduce dielectric constants and improve the electrical transmission properties that are in the outermost position of the Tape pore open pores are used to anchor the entire surface aluminum foil coated with polyester or another adhesive 4.
- this is a layer / Braid made of tinned copper wires.
- the coaxial cable is approximately 2.00 mm, i.e. on Coaxial cable with extremely small external dimensions.
- the cable is highly flexible with high mechanical strength and durability of the transmission properties even with changing temperature loads.
- the cable according to the invention is characterized in particular by a low tolerance of the Wave resistance and a low operating capacity. For example, on 75 ohm cable according to the invention has an operating capacity of ⁇ 60 nF / km.
- the Attenuation is e.g. at 1 MHz at 2.3 dB / 100m, at 100 MHz at 27.7 dB / 100m and at 500 MHz at 67.9 dB / 100m.
Landscapes
- Communication Cables (AREA)
- Laminated Bodies (AREA)
- Insulated Conductors (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
Um hier weiterzukommen wurde bereits vorgeschlagen (EP 0428 622 B1), die Isolierung eines koaxialen Hochfrequenzkabels aus Polytetrafluorethylen dadurch herzustellen, daß eine Anzahl von Litzen aus porösem expandiertem Polytetrafluorethylen über dem zentralen Leiter zu einer einheitlichen Isolierung kalibriert werden. Abgesehen von dem technisch aufwendigen Herstellungsverfahren stößt die weitere Miniaturisierung bis hin zu den sog. Micro-Koaxialkabeln mit einem Gesamtaußendurchmesser von weniger als 2 mm auf erhebliche Schwierigkeiten.
Besondere Vorteile ergeben sich, wenn nach der Erfindung bei einer zweischichtigen Isolierung die den zentralen Leiter umschließende erste Schicht aus einem aus der Schmelze verarbeitbaren Fluorpolymer und die äußere poröse zweite Schicht aus einem aus der Schmelze nicht verarbeitbaren Fluorpolymer besteht. Diese Materialkombination in Verbindung mit der kraftschlüssig mit der porösen Schicht verbundenen Abschirmung führt zu einem kapazitätsarmen Micro-Koaxialkabel mit geringer Toleranz des Wellenwiderstandes, zu einer niedrigen Leitungsdämpfung und zu geringen Koppltungswiderständen in diesem Übertragungsmittel.
Weitere Verbesserungen des erfindungsgemäßen Kabels ergeben sich dann, wenn die äußerste poröse Schicht bzw. bei einem zweischichtigen Aufbau der Isolierung, die äußere Schicht aus einer ein- oder mehrlagigen Bewicklung aus einem porösen Band besteht Der Begriff Band" schließt im Rahmen der hier beschriebenen Erfindung selbstverständlich auch den Begriff
Bevorzugt eingesetzt werden jedoch Bänder (Folien) aus Polytetrafluorethylen, ein solches Band ist gereckt und gesintert, um den porösen Charakter des Bandes zu gewährleisten. Dabei kommt es auf die Mikroporosität des Bandmaterials an. Um die sicherzustellen, wird man das Band, hergestellt aus einem durch sog.
Pastenextrusion und anschließendes Walzen verarbeitetes Polytetrafluorethylen oder eines mit höchstens 2 Gew.-% Fluormonomeren modifizierten Polytetrafluorethylens, einem Reckvorgang mit einer Reckrate bis zu 2000 %, vorzugsweise zwischen 300 und 1000 %, unterwerfen. Die Reckung erfolgt in der Regel in Bandrichtung, sie kann aber auch quer dazu vorgenommen werden, z.B. dann, wenn die Porosität des Bandes oder der Folie erhöht werden soll. Durch einen gleichzeitig mit dem Reckvorgang erfolgenden oder auch dem Reckvorgang nachgeschalteten Sintervorgang wird die mechanische Festigkeit des Band- oder Folienmaterials erhöht.
Claims (18)
- Koaxiales Hochfrequenzkabel mit einer den zentralen Leiter umgebenden mehrschichtigen Isolierung aus polymeren Werkstoffen und mit einer die Isolierung umschließenden elektrischen Abschirmung, die von einer äußeren Umhüllung überdeckt ist, dadurch gekennzeichnet, daß die einzelnen Schichten der Isolierung aus Fluorpolymeren bestehen, mit mindestens einer den zentralen Leiter (1) umschließenden ersten Schicht (2) aus einem aus der Schmelze verarbeitbaren Fluorpolymer und einer äußeren zweiten Schicht (3) aus einem aus der Schmelze nicht verarbeitbaren Fluorpolymer, wobei die zweite Schicht (3) porös und mit der umgebenden Abschirmung (4) kraftschlüssig verbunden ist.
- Kabel nach Anspruch 1, dadurch gekennzeichnet, daß die Wanddicke der ernten Schicht (2) 0,8 bis 0,1 mm, vorzugsweise 0,3 bis 0,2 mm, beträgt.
- Kabel nach Anspruch 1, dadurch gekennzeichnet, daß die Wanddicke der zweiten Schicht (3) 0,8 bis 0,2 mm, vorzugsweise 0,4 bis 0,3 mm, beträgt.
- Kabel nach Anspruch 3, dadurch gekennzeichnet, daß die äußere zweite Schicht (3) aus einer ein- oder mehrlagigen Bewicklung aus einem porösen Band besteht.
- Kabel nach Anspruch 4, dadurch gekennzeichnet, daß das Band ein gerecktes Polytetrafluorethylenband ist.
- Kabel nach Anspruch 5, dadurch gekennzeichnet, daß das gereckte Band gesintert ist.
- Kabel nach Anspruch 5, dadurch gekennzeichnet, daß die Dicke des gereckten Polytetrafluorethylenbandes 15 ― 250 µm, vorzugsweise 30 ― 100 µm, beträgt.
- Kabel nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die den zentralen Leiter (1) umschließende erste Schicht (2) aus einem geschäumten Fluorpolymer besteht.
- Kabel nach Anspruch 4 oder einem der folgenden, dadurch gekennzeichnet, daß mindestens die äußerste Bandlage der Bewicklung mit der ihr zugekehrten Oberfläche der elektrischen Abschirmung (4) kraftschlüssig verbunden ist.
- Kabel nach Anspruch 9, dadurch gekennzeichnet, daß die kraftschlüssige Verbindung durch eine Verklebung erreicht ist.
- Kabel nach Anspruch 10, dadurch gekennzeichnet, daß als elektrische Abschirmung (4) eine kleberbeschichtete Metallfolie dient.
- Kabel nach Anspruch 11, dadurch gekennzeichnet, daß als elektrische Abschirmung (4) eine Aluminiumfolie mit einer Polyesterbeschichtung dient.
- Kabel nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die elektrische Abschirmung zweischichtig aufgebaut ist, mit einer inneren Schicht aus einer kleberbeschichteten Metallfolie (4) und einer äußeren Schicht (5) in Form einer Metalldrahtlage oder eines Geflechtes aus einzelnen Metalldrähten.
- Kabel nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die elektrische Abschirmung (4,5) von einer äußeren Umhüllung (6) aus einem Fluorpolymer umgeben ist.
- Kabel nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die elektrische Abschirmung (4,5) von einer äußeren Umhüllung (6) aus einem halogenfreien, flammwidrigen oder flammwidrigen, antikorrosiven Polymermaterial umgeben ist.
- Kabel nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die Verklebung der Abschirmung (4) mit der porösen Isolierschicht (3) durch den Wärmeinhalt der äußeren Umhüllung (6) beim Aufbringen derselben bewirkt wird.
- Kabel nach Anspruch 1 oder einem der folgenden1 dadurch gekennzeichnet, daß die Dielektrizitätskonstante der ersten Schicht (2) größer als die der zweiten Schicht (3) ist.
- Kabel nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die beiden Schichten (2; 3) miteinander verklebt sind.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19918539 | 1999-04-23 | ||
| DE19918539A DE19918539A1 (de) | 1999-04-23 | 1999-04-23 | Koaxiales Hochfrequenzkabel |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1047084A2 true EP1047084A2 (de) | 2000-10-25 |
| EP1047084A3 EP1047084A3 (de) | 2001-05-16 |
| EP1047084B1 EP1047084B1 (de) | 2007-10-10 |
Family
ID=7905671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00106427A Expired - Lifetime EP1047084B1 (de) | 1999-04-23 | 2000-03-24 | Koaxiales Hochfrequenzkabel |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6337443B1 (de) |
| EP (1) | EP1047084B1 (de) |
| AT (1) | ATE375595T1 (de) |
| CA (1) | CA2306340C (de) |
| DE (2) | DE19918539A1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH704600A1 (de) * | 2011-03-14 | 2012-09-14 | Huber+Suhner Ag | Koaxialkabel. |
| CN105931747A (zh) * | 2016-06-17 | 2016-09-07 | 江阴凯博通信科技有限公司 | 一种双层屏蔽环保同轴防伪电缆 |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI264020B (en) * | 2002-02-08 | 2006-10-11 | Hirakawa Hewtech Corp | Foamed coaxial cable with high precision and method of fabricating same |
| JP4055125B2 (ja) * | 2002-12-24 | 2008-03-05 | 日本光電工業株式会社 | 同軸ケーブルおよびそれを用いた伝送トランス |
| US7355123B2 (en) * | 2003-05-22 | 2008-04-08 | Hirakawa Hewtech Corporation | Foam coaxial cable and method of manufacturing the same |
| DE10325517A1 (de) * | 2003-06-05 | 2004-12-23 | Hew-Kabel/Cdt Gmbh & Co. Kg | Elektrische Heizleitung oder Heizband |
| JP2005339818A (ja) * | 2004-05-24 | 2005-12-08 | Hirakawa Hewtech Corp | 高精度発泡同軸ケーブル |
| US20060011376A1 (en) * | 2004-07-16 | 2006-01-19 | General Electric Company | Multi-axial electrically conductive cable with multi-layered core and method of manufacture and use |
| EP2156860A1 (de) * | 2008-08-20 | 2010-02-24 | Centre National De La Recherche Scientifique-CNRS | Verfahren zur Herstellung isolierter Elektroden zum Einfügen elektrischer Felder in ein leitfähiges Material |
| EP2372721A4 (de) * | 2008-12-02 | 2014-01-01 | Fujikura Ltd | Übertragungskabel und dieses verwendende signalübertragungskabel |
| US8308505B2 (en) | 2009-12-09 | 2012-11-13 | Scott Hatton | Guarded coaxial cable assembly |
| EP2615240A3 (de) * | 2012-01-16 | 2014-09-03 | Prad Research Development Limited | In Rohr eingeschlossene Motorleitung |
| US9455069B2 (en) * | 2012-07-24 | 2016-09-27 | Schlumberger Technology Corporation | Power cable system |
| FR3002076B1 (fr) * | 2013-02-12 | 2022-11-11 | Nexans | Cable electrique resistant aux decharges partielles |
| JP6372325B2 (ja) * | 2014-11-27 | 2018-08-15 | 日立金属株式会社 | 同軸ケーブル及びそれを用いた医療用ケーブル |
| US9672958B2 (en) * | 2015-05-19 | 2017-06-06 | Te Connectivity Corporation | Electrical cable with shielded conductors |
| US11545280B2 (en) | 2018-08-23 | 2023-01-03 | The Esab Group Inc. | Cable hose with embedded features |
| US10964451B2 (en) | 2018-11-06 | 2021-03-30 | The Esab Group Inc. | Cable hose with conductive electromagnetic interference shield |
| CN111863406B (zh) * | 2020-08-14 | 2022-05-24 | 阳光电源股份有限公司 | 一种线圈绕组、变压器和串并型电力电子装置 |
| CN114068105B (zh) * | 2021-11-17 | 2023-10-27 | 佑创射频技术(江苏)有限公司 | 一种稳相稳幅电缆的生产工艺 |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1146319A (en) * | 1966-12-19 | 1969-03-26 | United Carr Inc | Co-axial cable |
| FR2219498B1 (de) * | 1973-02-23 | 1977-07-22 | Cables De Lyon Geoffroy Delore | |
| DE2541243A1 (de) * | 1975-09-12 | 1977-03-24 | Aeg Telefunken Kabelwerke | Hochfrequenz-koaxialleitung |
| US4368350A (en) * | 1980-02-29 | 1983-01-11 | Andrew Corporation | Corrugated coaxial cable |
| US4477693A (en) * | 1982-12-09 | 1984-10-16 | Cooper Industries, Inc. | Multiply shielded coaxial cable with very low transfer impedance |
| DE3515574A1 (de) * | 1984-05-03 | 1985-11-07 | Osakeyhtiö Nokia AB, Helsinki | Koaxialkabel und verfahren zur herstellung einer den innenleiter dieses kabels umgebenen isolierung |
| US5059263A (en) * | 1988-08-12 | 1991-10-22 | W. L. Gore & Associates, Inc. | Large gauge insulated conductor and coaxial cable, and process for their manufacture |
| US4978813A (en) * | 1989-08-29 | 1990-12-18 | W. L. Gore & Associates, Inc. | Electrical cable |
| US5210377A (en) * | 1992-01-29 | 1993-05-11 | W. L. Gore & Associates, Inc. | Coaxial electric signal cable having a composite porous insulation |
| US5293001A (en) * | 1992-04-14 | 1994-03-08 | Belden Wire & Cable Company | Flexible shielded cable |
| US5358516A (en) * | 1992-12-11 | 1994-10-25 | W. L. Gore & Associates, Inc. | Implantable electrophysiology lead and method of making |
| US5468314A (en) * | 1993-02-26 | 1995-11-21 | W. L. Gore & Associates, Inc. | Process for making an electrical cable with expandable insulation |
| JPH07153330A (ja) * | 1993-11-29 | 1995-06-16 | Junkosha Co Ltd | 同軸ケーブル用コア、これを用いた同軸ケーブル、およびその製造方法 |
| JP2976816B2 (ja) * | 1994-07-21 | 1999-11-10 | 住友電気工業株式会社 | セミリジッド同軸ケーブル |
| US5817981A (en) * | 1995-09-05 | 1998-10-06 | Lucent Technologies Inc. | Coaxial cable |
-
1999
- 1999-04-23 DE DE19918539A patent/DE19918539A1/de not_active Ceased
-
2000
- 2000-03-24 AT AT00106427T patent/ATE375595T1/de active
- 2000-03-24 DE DE50014701T patent/DE50014701D1/de not_active Expired - Lifetime
- 2000-03-24 EP EP00106427A patent/EP1047084B1/de not_active Expired - Lifetime
- 2000-04-19 CA CA002306340A patent/CA2306340C/en not_active Expired - Fee Related
- 2000-04-21 US US09/556,939 patent/US6337443B1/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH704600A1 (de) * | 2011-03-14 | 2012-09-14 | Huber+Suhner Ag | Koaxialkabel. |
| WO2012123266A1 (de) * | 2011-03-14 | 2012-09-20 | Huber+Suhner Ag | Koaxialkabel |
| CN105931747A (zh) * | 2016-06-17 | 2016-09-07 | 江阴凯博通信科技有限公司 | 一种双层屏蔽环保同轴防伪电缆 |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2306340C (en) | 2005-11-15 |
| CA2306340A1 (en) | 2000-10-23 |
| EP1047084A3 (de) | 2001-05-16 |
| DE50014701D1 (de) | 2007-11-22 |
| EP1047084B1 (de) | 2007-10-10 |
| US6337443B1 (en) | 2002-01-08 |
| ATE375595T1 (de) | 2007-10-15 |
| DE19918539A1 (de) | 2000-10-26 |
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