EP0635850B1 - High frequency broadband electrical coaxial cable - Google Patents

High frequency broadband electrical coaxial cable Download PDF

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Publication number
EP0635850B1
EP0635850B1 EP94111427A EP94111427A EP0635850B1 EP 0635850 B1 EP0635850 B1 EP 0635850B1 EP 94111427 A EP94111427 A EP 94111427A EP 94111427 A EP94111427 A EP 94111427A EP 0635850 B1 EP0635850 B1 EP 0635850B1
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EP
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Prior art keywords
coaxial cable
conductor
wound
cable
round
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EP94111427A
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German (de)
French (fr)
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EP0635850A1 (en
Inventor
Konrad Buckel
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WL Gore and Associates GmbH
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WL Gore and Associates GmbH
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    • 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

Definitions

  • the invention relates to a broadband radio frequency-compatible electrical coaxial cable according to the preamble of claim 1.
  • Such a coaxial cable is known from EP-A-0 504 776.
  • Low signal attenuation is desirable in order to be able to transmit signals over the longest possible distances with one cable.
  • a high return loss means that the wave impedance of the cable is as constant as possible over its length. Wave resistance changes along the cable lead to disturbing signal reflections and thus signal reflux.
  • the inner conductor and outer conductor of the cable would have to have a certain minimum cross-section if one considers the lower frequency range.
  • the skin effect has an increasing effect with increasing frequency.
  • the dielectric between the inner conductor and the outer conductor in particular its dielectric constant and its dielectric loss factor.
  • a solid copper pipe leads to a cable that is practically inflexible and that is not drum-ready, i.e. that cannot be wound on cable drums.
  • the known coaxial cable according to the preamble of claim 1 according to EP-A-0 504 776 has an inner conductor made of a single layer, which is formed by the helically wound electrically conductive foil (copper tape).
  • an underwater coaxial cable in which a round conductor stranded composite is arranged on a thin nylon carrier as the inner conductor and carries an insulating layer made of polypropylene. On this insulating layer there is a copper round cable strand, wrapped with a copper mylar tape. On this coaxial cable there is a reinforcement arrangement consisting of an insulating layer, a first and a second steel wire stranded composite and an outer jacket, as viewed from the outside of the copper-Mylar tape.
  • a coaxial cable is known from JP-A-12 32 611, in which a metal-plastic strip is wound on the insulating material surrounding the inner conductor to suppress external interference, the metallic coating of which is connected to the outer conductor.
  • a coaxial cable is known from FR-A-92 82 87, in which both the inner conductor and the outer conductor consist of a wound metal jacket.
  • the object of the invention is to make available a low-loss coaxial cable which leads to the best possible compromise with regard to the three aspects of electrical properties, mechanical properties and production costs.
  • Both the helical winding of an electrically conductive film on a plastic core and the stranding of stranded conductors on a round core are manufacturing processes which, compared to the braiding of round or flat conductors on a core, are considerably faster, use simpler machines and require less preparation for setting up the machines.
  • the inner layer of its inner conductor consists of a silver-plated copper foil on which there is a stranded connection of silver-plated round copper wires.
  • the plastic core of the inner conductor can be formed by hollow FEP (fluoroethylene propylene).
  • the dielectric between the inner conductor and outer conductor is preferably made of microporous PTFE (polytetrafluoroethylene).
  • the embodiment of a coaxial cable shown in the figure extends from the inside to the outside: a plastic core 1, a silver-plated copper foil 2 wound on the plastic core, a round conductor stranded association made of silver-plated round copper wires applied to the copper foil 2, a dielectric 4, a shield construction 5 as an outer conductor and a plastic sheath 6.
  • the plastic core 1, the copper foil 2 and the round conductor strand assembly 3 form the inner conductor construction of this coaxial cable.
  • the signal attenuation depends, inter alia, on the characteristic impedance, the outer diameter of the inner conductor and the inner diameter of the outer conductor of the coaxial cable. If you want to achieve the same signal attenuation with the cable according to the invention as with a known coaxial cable with a copper tube as the inner conductor, with otherwise the same cable construction, you have to achieve the same characteristic impedance and the same outer diameter of the inner conductor construction.
  • the reason for this is that such a round conductor stranding leads to a considerable increase in the inductance of the inner conductor and thus of the cable, which, according to equation (2), leads to a considerable change in the characteristic impedance.
  • the characteristic impedance which is usually specified as the nominal value, which must be adhered to as well as possible in order to avoid signal reflections in the entire system comprising the coaxial cable, must not be changed.
  • the solution to this problem according to the invention is to underlay the round conductor strand assembly 3 with the helically overlapping wound copper foil 2, with electrical contact between the copper foil 2 and the round conductor strand assembly 3. In this way, the inductance of the round conductor strand assembly 3 is short-circuited and thus switched off. This results in an overall inductance L. like a coaxial cable with a solid copper tube as inner conductor with otherwise the same cable structure.

Description

Die Erfindung betrifft ein Breitband-Hochfrequenz-taugliches elektrisches Koaxialkabel nach dem Oberbegrift des Anspruchs 1.The invention relates to a broadband radio frequency-compatible electrical coaxial cable according to the preamble of claim 1.

Ein solches Koaxialkabel ist aus der EP-A-0 504 776 bekannt.Such a coaxial cable is known from EP-A-0 504 776.

An Koaxialkabel werden üblicherweise sowohl hinsichtlich elektrischer Eigenschaften als auch hinsichtlich mechanischer Eigenschaften bestimmte Anforderungen gestellt. Insbesondere dann, wenn es sich um Koaxialkabel handelt, die im Hochfrequenzbereich für ein breites Frequenzband tauglich sein sollen, bspw. in einem Frequenzband von einigen MHz bis in den GHz-Bereich, sollen folgende elektrische Eigenschaften erzielt werden:

  • niedrige Signaldämpfung,
  • hohe Rückflußdämpfung,
  • Leistungsbelastbarkeit.
Coaxial cables are usually subject to certain requirements with regard to both electrical properties and mechanical properties. In particular, when it comes to coaxial cables that are to be suitable for a broad frequency band in the high-frequency range, for example in a frequency band from a few MHz to the GHz range, the following electrical properties should be achieved:
  • low signal attenuation,
  • high return loss,
  • Resilience.

An mechanischen Eigenschaften sind erwünscht:

  • hohe Flexibilität,
  • hohe Lebensdauer bei Biege- und/oder Trommelbelastung
  • robuste Ausführung gegenüber Zug- und/oder Druckbelastung, und
  • kleiner Kabeldurchmesser.
The following mechanical properties are desirable:
  • high flexibility,
  • long service life with bending and / or drum loading
  • robust design against tensile and / or compressive load, and
  • small cable diameter.

Niedrige Signaldämpfung ist erwünscht, um mit einem Kabel Signale über möglichst lange Strecken übertragen zu können. Eine hohe Rückflußdämpfung bedingt, daß der Wellenwiderstand des Kabels über dessen Länge möglichst konstant ist. Wellenwiderstandsänderungen entlang des Kabels führen zu störenden Signalreflexionen und damit Signalrückfluß. Für eine bestimmte Leistungsbelastbarkeit müßten Innenleiter und Außenleiter des Kabels einen bestimmten Mindestquerschnitt aufweisen, wenn man den niedrigeren Frequenzbereich betrachtet. Mit steigender Frequenz wirkt sich zunehmend der Skineffekt aus. Von wichtigem Einfluß ist das Dielektrikum zwischen Innenleiter und Außenleiter, insbesondere dessen Dielektrizitätskonstante und dessen dielektrischer Verlustfaktor.Low signal attenuation is desirable in order to be able to transmit signals over the longest possible distances with one cable. A high return loss means that the wave impedance of the cable is as constant as possible over its length. Wave resistance changes along the cable lead to disturbing signal reflections and thus signal reflux. For a certain power rating, the inner conductor and outer conductor of the cable would have to have a certain minimum cross-section if one considers the lower frequency range. The skin effect has an increasing effect with increasing frequency. Of important Influence is the dielectric between the inner conductor and the outer conductor, in particular its dielectric constant and its dielectric loss factor.

Sehr gute elektrische Eigenschaften lassen sich mit einem Kabel erreichen, dessen Innenleiter als massiver Kupferleiter oder massives Kupferrohr ausgebildet ist. Damit lassen sich aber nicht die üblicherweise erwünschten mechanischen Eigenschaften erzielen. Ein massives Kupferrohr führt zu einem Kabel, das praktisch nicht biegbar ist und das nicht trommelfähig ist, d.h., nicht auf Kabeltrommeln aufgewickelt werden kann.Very good electrical properties can be achieved with a cable whose inner conductor is designed as a solid copper conductor or solid copper tube. However, the mechanical properties that are usually desired cannot be achieved in this way. A solid copper pipe leads to a cable that is practically inflexible and that is not drum-ready, i.e. that cannot be wound on cable drums.

Allgemein besteht das Bestreben, ein Kabel verfügbar zu machen, das einen möglichst guten Kompromiß zwischen den gewünschten elektrischen Eigenschaften und den gewünschten mechanischen Eigenschaften darstellt. Bekannte Kabel, bei denen eine niedrige Signaldämpfung im Vordergrund steht, sind bekannt als Zellflex- oder Flexwellkabel und weisen einen Innenleiter in Form eines Kupferwellrohres auf. Dieses weist eine Struktur ähnlich einem biegbaren Duschschlauch auf, um eine gewisse Biegbarkeit des Innenleiters zu erreichen. Dennoch besitzen solche Kabel geringe Flexibilität und Trommelfähigkeit. D.h., sie können nur mit großen Biegeradien gebogen und auf Kabeltrommeln aufgewickelt werden.In general, there is a desire to make a cable available that represents the best possible compromise between the desired electrical properties and the desired mechanical properties. Known cables in which low signal attenuation is in the foreground are known as Zellflex or Flexwell cables and have an inner conductor in the form of a corrugated copper tube. This has a structure similar to a bendable shower hose in order to achieve a certain bendability of the inner conductor. However, such cables have little flexibility and drum capability. This means that they can only be bent with large bending radii and wound on cable drums.

Bessere mechanische Eigenschaften hinsichtlich Biege- und Trommelfähigkeit hat man mit Koaxialkabeln erreicht, deren Innenleiter in Form eines auf einem Kunststoffkern angeordneten Flachleiter- oder Rundleitergeflechtes ausgebildet sind. Derartige Kabel erfordern jedoch eine relativ aufwendige und kostenintensive Fertigung. Bei häufigen Biege- oder Trommelzyklen haben sie nur eine vergleichsweise geringe Lebensdauer.Better mechanical properties with regard to the ability to bend and reel have been achieved with coaxial cables, the inner conductors of which are formed in the form of a flat conductor or round conductor braid arranged on a plastic core. However, such cables require a relatively complex and expensive manufacture. With frequent bending or drum cycles, they only have a comparatively short service life.

Das dem Oberbegriff des Anspruchs 1 entsprechende, bekannte Koaxialkabel nach der EP-A-0 504 776 besitzt einen Innenleiter aus einer einzigen Lage, die durch die wendelförmig gewickelte elektrisch leitende Folie (Kupferband) gebildet wird.The known coaxial cable according to the preamble of claim 1 according to EP-A-0 504 776 has an inner conductor made of a single layer, which is formed by the helically wound electrically conductive foil (copper tape).

Aus der GB-A-20 56 157 ist ein Unterwasser-Koaxialkabel bekannt, bei dem auf einem dünnen Nylonträger als Innenleiter ein Rundleiterverseilverbund angeordnet ist, der eine Isolierschicht aus Polypropylen trägt. Auf dieser Isolierschicht befindet sich ein Kupfer-Rundleiterverseilverbund, umwickelt mit einem Kupfer-Mylar-Band. Auf diesem Koaxialkabel befindet sich eine Verstärkungsanordnung aus - von dem Kupfer-Mylar-Band nach außen hin betrachtet - einer Isolierschicht, einem ersten und einem zweiten Stahldraht-Verseilverbund und einem Außenmantel.From GB-A-20 56 157 an underwater coaxial cable is known in which a round conductor stranded composite is arranged on a thin nylon carrier as the inner conductor and carries an insulating layer made of polypropylene. On this insulating layer there is a copper round cable strand, wrapped with a copper mylar tape. On this coaxial cable there is a reinforcement arrangement consisting of an insulating layer, a first and a second steel wire stranded composite and an outer jacket, as viewed from the outside of the copper-Mylar tape.

Aus der JP-A-12 32 611 ist ein Koaxialkabel bekannt, bei dem zum Unterdrücken äüßerer Störeinflüsse auf dem den Innenleiter umgebenden Isolierstoff ein Metall-Kunststoffband gewickelt ist, dessen metallische Beschichtung mit dem Außenleiter in Verbindung steht.A coaxial cable is known from JP-A-12 32 611, in which a metal-plastic strip is wound on the insulating material surrounding the inner conductor to suppress external interference, the metallic coating of which is connected to the outer conductor.

Aus der FR-A-92 82 87 ist ein Koaxialkabel bekannt, bei dem sowohl der Innenleiter als auch der Außenleiter aus einem gewickelten Metallmantel bestehen.A coaxial cable is known from FR-A-92 82 87, in which both the inner conductor and the outer conductor consist of a wound metal jacket.

Der Erfindung liegt die Aufgabe zugrunde, ein dämpfungsarmes Koaxialkabel verfügbar zu machen, das zu einem möglichst guten Kompromiß hinsichtlich der drei Aspekte elektrische Eigenschaften, mechanische Eigenschaften und Herstellungskosten führt.The object of the invention is to make available a low-loss coaxial cable which leads to the best possible compromise with regard to the three aspects of electrical properties, mechanical properties and production costs.

Eine Lösung dieser Aufgabe ist in Anspruch 1 angegeben. Vorteilhafte Weiterbildungen finden sich in den Unteransprüchen.A solution to this problem is given in claim 1. Advantageous further developments can be found in the subclaims.

Sowohl das wendelförmige Wickeln einer elektrisch leitenden Folie auf einen Kunststoffkern als auch das Verseilen von Litzenleitern auf einem runden Kern sind Herstellungsvorgänge, die im Vergleich zu dem Flechten von Rund- oder Flachleitern auf einen Kern wesentlich schneller sind, mit einfacheren Maschinen auskommen und einen geringeren Vorbereitungsaufwand für das Einrichten der Maschinen erfordern.Both the helical winding of an electrically conductive film on a plastic core and the stranding of stranded conductors on a round core are manufacturing processes which, compared to the braiding of round or flat conductors on a core, are considerably faster, use simpler machines and require less preparation for setting up the machines.

Bei einer besonders bevorzugten Ausführungsform eines erfindungsgemäßen Koaxialkabels besteht die Innenlage von dessen Innenleiter aus einer versilberten Kupferfolie, auf welcher sich ein Verseilverbund von versilberten Kupferrunddrähten befindet. Der Kunststoffkern des Innenleiters kann durch hohles FEP (Fluorethylenpropylen) gebildet sein. Das Dielektrikum zwischen Innenleiter und Außenleiter besteht vorzugsweise aus mikroporösem PTFE (Polytetrafluorethylen).In a particularly preferred embodiment of a coaxial cable according to the invention, the inner layer of its inner conductor consists of a silver-plated copper foil on which there is a stranded connection of silver-plated round copper wires. The plastic core of the inner conductor can be formed by hollow FEP (fluoroethylene propylene). The dielectric between the inner conductor and outer conductor is preferably made of microporous PTFE (polytetrafluoroethylene).

Anhand eines Ausführungsbeispiels, das in der einzigen Figur der beigefügten Zeichnung dargestellt ist, wird nun die Erfindung näher erläutert.The invention will now be explained in more detail using an exemplary embodiment which is shown in the single figure of the accompanying drawing.

Von innen nach außen gehend weist die in der Figur dargestellte Ausführungsform eines Koaxialkabels auf: einen Kunststoffkern 1, eine auf den Kunststoffkern gewickelte, versilberte Kupferfolie 2, einen auf die Kupferfolie 2 aufgebrachten Rundleiterverseilverband aus versilberten Kupferrunddrähten, ein Dielektrikum 4, eine Schirmkonstruktion 5 als Außenleiter und einen Kunststoffmantel 6. Dabei bilden der Kunststoffkern 1, die Kupferfolie 2 und der Rundleiterverseilverband 3 die Innenleiterkonstruktion dieses Koaxialkabels.The embodiment of a coaxial cable shown in the figure extends from the inside to the outside: a plastic core 1, a silver-plated copper foil 2 wound on the plastic core, a round conductor stranded association made of silver-plated round copper wires applied to the copper foil 2, a dielectric 4, a shield construction 5 as an outer conductor and a plastic sheath 6. The plastic core 1, the copper foil 2 and the round conductor strand assembly 3 form the inner conductor construction of this coaxial cable.

Die Signaldämpfung α eines Koaxialkabels läßt sich folgendermaßen darstellen:

Figure imgb0001

f =
Frequenz
ρ =
spezifischer Leiterwiderstand
Z0 =
Wellenwiderstand des Koaxialkabels
d =
Außendurchmesser des Innenleiters
D =
Innendurchmesser des Außenleiters
K1 =
Konstante
K2 =
Konstante
εr =
relative Dielektrizitätskonstante
tanδ =
dielektrischer Verlustfaktor
The signal attenuation α of a coaxial cable can be represented as follows:
Figure imgb0001
f =
frequency
ρ =
specific conductor resistance
Z 0 =
Characteristic impedance of the coaxial cable
d =
Outside diameter of the inner conductor
D =
Inner diameter of the outer conductor
K 1 =
constant
K 2 =
constant
ε r =
relative dielectric constant
tanδ =
dielectric loss factor

Die Beziehung für den Wellenwiderstand Z0 lautet Z 0 = L C

Figure imgb0002
The relationship for the wave resistance Z 0 is Z. 0 = L C.
Figure imgb0002

Darin bedeuten

L =
Induktivität
C =
Kapazität.
Mean in it
L =
Inductance
C =
Capacity.

Aus Gleichung (1) geht hervor, daß die Signaldämpfung u.a. von dem Wellenwiderstand, dem Außendurchmesser des Innenleiters und dem Innendurchmesser des Außenleiters des Koaxialkabels abhängt. Möchte man mit dem erfindungsgemäßen Kabel die gleiche Signaldämpfung wie mit einem bekannten Koaxialkabel mit einem Kupferrohr als Innenleiter erreichen, bei ansonsten gleichem Kabelaufbau, muß man den gleichen Wellenwiderstand und den gleichen Außendurchmesser der Innenleiterkonstruktion erreichen. Würde man auf den Kunststoffkern 1 nur den Rundleiterverseilverband 3 aufbringen, müßte dieser einerseits eine etwas größere radiale Dicke als das zu vergleichende Kupferrohr aufweisen, bei gleichem Außendurchmesser, um einerseits bei niedrigeren Frequenzen, bei denen sich der Skineffekt noch nicht so stark bemerkbar macht, eine gleiche Strombelastbarkeit wie mit dein massiven Kupferrohr zu erzielen. Andererseits müßte der gleiche Außendurchmesser wie der des Kupferrohrs gewählt werden, wenn der restliche Kabelaufbau gleich bleiben soll, um zu einer gleich geringen Signaldämpfung zu kommen. Hierfür ist aber vorausgesetzt, daß sich durch den Austausch des Kupferrohrs durch einen Rundleiterverseilverband der Wellenwiderstand Z0 nicht ändert. Diese Voraussetzung ist aber nicht gegeben, wenn man auf den Kunststoffkern 1 lediglich den Rundleiterverseilverband 3 aufbringt. Der Grund hierfür ist, daß ein derartiger Rundleiterverseilverband zu einer beträchtlichen Erhöhung der Induktivität des Innenleiters und damit des Kabels führt, was gemäß Gleichung (2) zu einer erheblichen Veränderung des Wellenwiderstandes führt. Der Wellenwiderstand, der üblicherweise als Nenngröße vorgegeben ist, die möglichst gut eingehalten werden muß, um Signalreflexionen in dem gesamten das Koaxialkabel aufweisenden System zu vermeiden, darf aber nicht geändert werden.From equation (1) it can be seen that the signal attenuation depends, inter alia, on the characteristic impedance, the outer diameter of the inner conductor and the inner diameter of the outer conductor of the coaxial cable. If you want to achieve the same signal attenuation with the cable according to the invention as with a known coaxial cable with a copper tube as the inner conductor, with otherwise the same cable construction, you have to achieve the same characteristic impedance and the same outer diameter of the inner conductor construction. If only the round conductor strand assembly 3 were to be applied to the plastic core 1, this would have to have a somewhat greater radial thickness than the copper pipe to be compared, with the same outside diameter, in order to have one at lower frequencies, at which the skin effect is not yet so noticeable same current carrying capacity as with your solid copper pipe. On the other hand, the same outside diameter as that of the copper pipe would have to be chosen if the remaining cable structure was to remain the same in order to achieve an equally low signal attenuation. For this, however, it is presupposed that the wave resistance Z 0 does not change due to the exchange of the copper tube by a round conductor strand assembly. However, this requirement does not exist if only the round conductor strand assembly 3 is applied to the plastic core 1. The reason for this is that such a round conductor stranding leads to a considerable increase in the inductance of the inner conductor and thus of the cable, which, according to equation (2), leads to a considerable change in the characteristic impedance. The characteristic impedance, which is usually specified as the nominal value, which must be adhered to as well as possible in order to avoid signal reflections in the entire system comprising the coaxial cable, must not be changed.

Die erfindungsgemäße Lösung dieses Problems besteht darin, den Rundleiterverseilverband 3 mit der wendelförmig überlappend gewickelten Kupferfolie 2 zu unterlegen, bei elektrischem Kontakt zwischen der Kupferfolie 2 und dem Rundleiterverseilverband 3. Auf diese Weise wird die Induktivität des Rundleiterverseilverbandes 3 kurzgeschlossen und damit ausgeschaltet. Dies resultiert in einer Gesamtinduktivität L wie bei einem Koaxialkabel mit einem massiven Kupferrohr als Innenleiter bei ansonsten gleichem Kabelaufbau.The solution to this problem according to the invention is to underlay the round conductor strand assembly 3 with the helically overlapping wound copper foil 2, with electrical contact between the copper foil 2 and the round conductor strand assembly 3. In this way, the inductance of the round conductor strand assembly 3 is short-circuited and thus switched off. This results in an overall inductance L. like a coaxial cable with a solid copper tube as inner conductor with otherwise the same cable structure.

Den Innenleiter doppellagig zu machen, führt noch zu einem weiteren Vorteil. Wie bereits erwähnt, müßte bei einem Innenleiter, der nur durch einen Rundleiterverseilverband gebildet ist, dieser eine Dicke entsprechend dem Kupferrohr bei bekannten Koaxialkabeln aufweisen, um die gleiche Leistungs- bzw. Strombelastbarkeit zu gewährleisten. Ein solcher Rundleiterverseilverband müßte mit entsprechend dicken Kupferdrähten hergestellt werden. Deren Flexibilität wäre beträchtlich geringer als die Dicke der Kupferdrähte, die man für den Rundleiterverseilverband 3 eines erfindungsgemäß doppellagig aufgebauten Innenleiters verwenden kann. Die Aufteilung des Innenleiterquerschnittes auf die Kupferfolie 2 und den Rundleiterverseilverbund 3 führt somit zu einer besseren Flexibilität des Kabels.Making the inner conductor double-layer leads to another advantage. As already mentioned, in the case of an inner conductor which is formed only by a round conductor stranded assembly, this would have to have a thickness corresponding to the copper tube in known coaxial cables in order to ensure the same power and current carrying capacity. Such a round conductor strand association would have to be produced with correspondingly thick copper wires. Their flexibility would be considerably less than the thickness of the copper wires that can be used for the round conductor strand assembly 3 of an inner conductor constructed according to the invention in two layers. The division of the inner conductor cross-section between the copper foil 2 and the round conductor strand composite 3 thus leads to better flexibility of the cable.

Claims (9)

  1. A high-frequency broadband electrical coaxial cable comprising
    - a cylindrical inner conductor (2, 3) disposed on a plastics core (1) and including an electrically conducting foil (2) wound in helical overlapping manner,
    - an outer conductor (5) concentric therewith
    - and a dielectric (4) located between inner conductor (2, 3) and outer conductor (5),
    characterized in that the inner conductor (2, 3) is of double-layer construction, comprising an inner layer in the form of said wound foil (2) and an outer layer in the form of a round conductor stranded system (3) in electrical contact with said inner layer.
  2. The coaxial cable of claim 1,
    characterized in that the inner layer (2) is wound using a copper foil.
  3. The coaxial cable of claim 1 or 2,
    characterized in that the inner layer (2) is wound using a silvered foil.
  4. The coaxial cable of any one of claims 1 to 3,
    characterized in that the outer layer (3) is composed with stranded copper wires.
  5. The coaxial cable of any one of claims 1 to 4,
    characterized in that the outer layer (3) is composed with stranded round conductors.
  6. The coaxial cable of any one of claims 1 to 5,
    characterized in that the plastics core (1) is composed with FEP (fluoroethylenepropylene).
  7. The coaxial cable of any one of claims 1 to 6,
    characterized in that the plastics core (1) is hollow.
  8. The coaxial cable of any one of claims 1 to 7,
    characterized in that the outer conductor (5) is surrounded by a plastics jacket (6).
  9. The coaxial cable of any one of claims 1 to 8,
    characterized in that the dielectric (4) consists of microporous PTFE (polytetrafluoroethylene).
EP94111427A 1993-07-22 1994-07-21 High frequency broadband electrical coaxial cable Expired - Lifetime EP0635850B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9310993U 1993-07-22
DE9310993U DE9310993U1 (en) 1993-07-22 1993-07-22 Broadband radio frequency-compatible electrical coaxial cable
US08/278,731 US5500488A (en) 1993-07-22 1994-07-21 Wide band high frequency compatible electrical coaxial cable

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EP0635850A1 EP0635850A1 (en) 1995-01-25
EP0635850B1 true EP0635850B1 (en) 1997-09-10

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EP (1) EP0635850B1 (en)
JP (1) JPH07141927A (en)
DE (1) DE9310993U1 (en)

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JPH07141927A (en) 1995-06-02
DE9310993U1 (en) 1994-11-17
US5500488A (en) 1996-03-19
EP0635850A1 (en) 1995-01-25

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