EP3134905B1 - Câble de données - Google Patents

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Publication number
EP3134905B1
EP3134905B1 EP15723847.8A EP15723847A EP3134905B1 EP 3134905 B1 EP3134905 B1 EP 3134905B1 EP 15723847 A EP15723847 A EP 15723847A EP 3134905 B1 EP3134905 B1 EP 3134905B1
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EP
European Patent Office
Prior art keywords
pair
shielding
film
shielding film
data cable
Prior art date
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Active
Application number
EP15723847.8A
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German (de)
English (en)
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EP3134905A1 (fr
Inventor
Melanie Dettmer
Bernd Janssen
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.)
Leoni Kabel GmbH
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Leoni Kabel GmbH
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Publication date
Application filed by Leoni Kabel GmbH filed Critical Leoni Kabel GmbH
Publication of EP3134905A1 publication Critical patent/EP3134905A1/fr
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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
    • H01B11/002—Pair constructions
    • 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
    • H01B11/20—Cables having a multiplicity of coaxial lines
    • H01B11/203—Cables having a multiplicity of coaxial lines forming a flat arrangement

Definitions

  • the invention relates to a data cable for high-speed data transmission with the preamble of claim 1.
  • Such a data cable is for example from the US 2012/0145429 A1 refer to.
  • data cables are used for data transmission, in which typically several data lines are combined in a common cable sheath.
  • shielded wire pairs are used as data lines, the two wires in particular running parallel to one another or alternatively being twisted together.
  • a respective wire consists of the actual conductor, for example a solid conductor wire or a stranded wire, which is surrounded by insulation.
  • the pair of wires of a respective data line is surrounded by (pair) shielding.
  • the data cables typically have a plurality of pairs of wires shielded in this way, which form a cable core and which are surrounded by a common outer shield and a common cable jacket.
  • Such data cables are used for high-speed data connections and are designed for data rates of greater than 5 Gbit / s, in particular> 14 GHz.
  • the outer shield is important for the EMC and the EMI properties, it does not transport any signals.
  • the respective pair screen determines the symmetry and the signal properties of a respective pair of wires.
  • Such data cables are typically so-called symmetrical data lines, in which the signal is transmitted via one wire and the inverted signal via the other wire. The differential signal component between these two signals is evaluated, so that external effects which affect both signals are eliminated.
  • Such data cables are often pre-assembled on plugs.
  • the connectors are often designed as so-called small form pluggable connectors, or SFP connectors for short.
  • SFP connectors There are different versions, for example so-called SFP-, SFP +, or CXP- QSFP connectors.
  • These connectors have special connector housings, such as those from the WO 2011 072 869 A1 or the WO 2011 089 003 A1 can be seen.
  • a direct so-called "back plane" connection without a plug is also possible.
  • Such plug housings have a printed circuit board or circuit board, some with integrated electronics.
  • the respective data cable must be connected to the rear of the connector on this board.
  • the individual wires of the data cable are soldered or welded to the board.
  • this typically forms a tongue with connection contacts, which is inserted into a mating connector.
  • Such boards are also called paddle cards.
  • the pair shielding of a respective pair of wires is - such as from the EP 2 112 669 A2 can be seen - designed as a longitudinally folded foil shield.
  • the shield is therefore folded in a longitudinal direction of the cable around the pair of wires, the two ends overlapping in a longitudinally overlapping area.
  • the shielding film used for the shielding is a multi-layer shielding comprising at least one conductive (metal) layer and one insulating layer.
  • An aluminum layer is usually used as the conductive layer and a PET film is used as the insulating layer.
  • the PET film is as a backing is formed, on which a metallic coating is applied to form the conductive layer.
  • common mode signal also referred to as a common mode signal
  • a common mode signal is no longer sufficiently attenuated in the case of longitudinally folded shields, as is the case when wrapping with a shielding film.
  • Such high-speed data connections generally aim to increase the transmission performance.
  • the transmission rates and thus the frequency range of such data cables therefore increase more and more, and with it the problems associated with the common-mode signal components.
  • a data cable with a shield structure can be found, the shield structure having two conductive foils each wound on a gap.
  • JP 2014 017131 A describes a data cable with a shield structure which has two conductive foils which are wound in opposite directions to one another and each with an overlap.
  • the object of the invention is to enable improved data transmission with high signal frequencies of greater than 10 GHz in such a high-speed data connection.
  • the data cable designed for high-speed data transmission comprises at least one and preferably a plurality of wire pairs made up of two wires extending in the longitudinal direction, each wire pair being surrounded by a foil-like pair shield.
  • the pair shield has a first inner shield foil and a second outer shield foil, the inner shield foil being wrapped around the pair of wires.
  • the two shield foils are electrically contacted.
  • This embodiment is based on the consideration of combining the advantages of a helical pair shield with those of a longitudinally folded pair shield.
  • This embodiment is based on the knowledge that the resonance effects which occur in the case of a helically wound pair shield at high signal frequencies are based on the fact that, in the case of a conventional wound pair shield, which is usually multilayered, the two conductive layers are insulated from one another in the overlap region of the wound shield and thereby a capacitor is formed.
  • the helical winding results a coil, so that overall a resonant circuit is formed with a predetermined resonance frequency, which can no longer be shifted to higher frequencies by design measures in the conventional design.
  • the construction of the pair shielding by means of two layers which are electrically connected to one another reliably prevents the formation of such a resonant circuit, since there is no coil-like winding due to the electrical connection, and the coil is therefore virtually short-circuited.
  • the resonance frequency is the root of (1 / (L ⁇ C)). Since the inductance is at least significantly reduced, the resonance frequency can easily be set to greater than 15 GHz. In contrast to this, this resonance or cut-off frequency is limited upwards to approximately 15 GHz in the case of conventional wound around with a metal foil, depending on the geometry. In this respect, the basic concept of a longitudinally folded pair shielding is at least adopted from the functional result.
  • the wrapping - preferably with an overlap - reliably suppresses the disadvantage of a longitudinally folded pair shield, namely the high common-mode signal.
  • the pair shielding described here with the structure of the two shielding foils, therefore achieves efficient shielding without disruptive side effects. Resonance effects with a correspondingly high attenuation of the signal and - in particular if the inner shield foil overlaps - insufficient attenuation of the common mode signal are effectively avoided.
  • this structure is also characterized by simpler manufacture, better symmetry and increased (bending) flexibility.
  • the cores of a respective pair of cores in particular run parallel to one another and are therefore not twisted.
  • the inner shield foil is still wrapped around the pair of wires with an overlap.
  • the desired attenuation of the common mode signal is advantageously reliably achieved by the overlap.
  • the width of the screen films is typically in the range from 4 to 6 millimeters.
  • a comparatively large overlap is set in the range from 20% to 40% of the width.
  • a lower cut-off frequency is achieved compared to a variant with a slight overlap.
  • the attenuation of the common mode signal component is improved, i.e. this unwanted signal component is better suppressed.
  • the resonance frequency can be set precisely with the help of the second outer shielding film, so that a usable frequency band up to e.g. exactly 20GHz can be achieved.
  • At least one and preferably both shielding foils are multilayered with a conductive layer and with a non-conductive carrier layer.
  • the two screen foils are designed in particular as so-called Al-PET foils.
  • the outer film can also be designed as a metal film or as an Al-PET - Al film, that is to say with a carrier layer which is provided on both sides with a conductive layer.
  • the two shielding foils are arranged with their conductive layers or sides facing one another.
  • the outer screen film is also wound and in particular in the opposite direction to the inner screen film. Good electrical contacting and bridging of the joints of the inner shielding film are thereby reliably achieved.
  • the pair shield can therefore also be referred to as a double-wound helix pair shield.
  • the outer shielding film is also wound onto a gap, ie adjacent winding sections are spaced apart from one another in the longitudinal direction.
  • the distance, ie the gap is in the range from 1 to 10% of the width of the shielding film.
  • This version is used in combination with the inner screen film wrapped with a large overlap (20-40% of the width).
  • the resonance frequency can be precisely adjusted through the special selection of the structure and the winding of the second shielding film.
  • the advantage of the particularly good common mode damping remains.
  • At least one drain wire is preferably arranged, which is connected in an electrically conductive manner to at least one, preferably both, shielding foils.
  • a drain wire is used, for example, for reliable electrical contacting of the pair shielding on a contact part, for example on a plug.
  • this drain wire is arranged between the two shielding foils and in particular runs parallel to the individual wires, for example in a gusset area.
  • the drain wire is contacted on the outside of the outer shielding film.
  • two double wires are preferably arranged symmetrically to a plane of symmetry of the pair of wires. In the case of the outer two wires, these lie on the connecting axis of the two conductors of the pair of wires.
  • a fixing film is additionally wound around the pair shielding for a respective pair of wires.
  • This is, in particular, an adhesive film that is glued to the pair shield. This fixes the shield structure of the pair shield.
  • the fixing film is in particular an insulating film, so that a respective pair of shields is electrically insulated from the outside, in particular, for example, to a common outer shield.
  • the data cable generally has a cable core or a cable core which comprises a plurality of electrical line components, at least one and preferably a plurality of the lines being formed by the pair of wires provided with the pair shielding.
  • the cable core expediently has only such wire pairs.
  • the cable core is still surrounded by a common outer shield. This is particularly multi-layered.
  • a common outer shield This is particularly multi-layered.
  • it has a braid or screen foils, in particular metallized foils, etc., as components.
  • a cable outer sheath is usually in turn arranged around the outer shield.
  • the data cable and in particular the pair shielding are also suitable for a particularly efficient contact connection of the pair shielding to a circuit board of a typical plug (small form pluggable SFP +, SFP28, QSFP28 ...) for high-speed data transmission (so-called paddle card ).
  • a typical plug small form pluggable SFP +, SFP28, QSFP28 .
  • paddle card high-speed data transmission
  • the pair of wires 4 consists of two wires 8, each of which is in turn formed by a central conductor 10, which is encased by insulation 12.
  • the conductor 10 is usually a solid solid conductor. Alternatively, stranded wires can also be used.
  • the two wires 8 preferably run parallel to one another and are therefore not twisted together.
  • the pair of wires 4 is surrounded overall by a multi-layer pair shield 6, which has an inner shield foil 14 and an outer shield foil 16.
  • the pair shield 6 is in particular finally formed by these two shield foils 14, 16.
  • the pair shield 6 is finally surrounded, in particular wrapped, by a fixing film 18, which is designed in particular as an adhesive film.
  • the fixing film 18 is made of plastic and is not electrically conductive, that is, electrically insulating.
  • an optional drain wire 20 is shown, which is preferably placed in a gusset area of the two wires 8.
  • the drain wire 20 is also arranged in particular between the two shield foils 14, 16.
  • two double wires 20 are preferably contacted on the outside with the outer shielding film 16, as is shown, for example, in FIG Fig. 5 is shown.
  • the two additional wires 20 lie on an imaginary plane of symmetry or connecting line of the two conductors 10. When the at least one additional wire 20 is placed on the outside, the latter is held in particular between the outer shielding film 16 and the fixing film 18.
  • the pair of wires 4 together with the pair shield 6 and the fixing film 18 and possibly the two wires 20 is also referred to below as a shielded pair 30.
  • the two screen foils 14, 16 are each preferably metal-coated plastic foils, in particular so-called AL-PET foils. These each have a carrier layer 22 designed as an insulating layer, on which a conductive layer 24 is applied (cf. in this regard in particular Figure 3 ). In the case of external double wires, the outer side of the outer shielding film 16 must also be designed as a conductive layer 24.
  • the outer shielding foil 16 is then, for example, a carrier layer 22 with conductive layers 24 applied on both sides or a metal foil which basically has conductive layers 24 on both sides.
  • the two shielding foils 14, 16 are oriented in such a way that their respective conductive layers 24 face one another and, in particular, touch one another, so that the two conductive layers 24 are electrically conductively contacted.
  • the inner shielding film 14 is wound helically around the pair of wires 4.
  • the shielding film 14 is usually wound with a very slight pitch, that is to say very closely.
  • the slope is typically only a few mm, for example in the range of 2 up to 6 mm, ie for each 360 ° wrap the screen film propagates 2 to 6 mm in the longitudinal direction 28.
  • the inner screen film 14 is wound with an overlap 26, that is to say that winding sections adjoining one another in the longitudinal direction 28 overlap. According to a preferred embodiment, this overlap 26 is approximately one third of the width B of the inner screen film 14.
  • the outer screen film 16 is preferably also wound, but in the opposite direction to the inner screen film 14. For example, it has the same slope as the inner screen film 14. Alternatively, the slope deviates from this and is, for example, less or also greater.
  • the outer screen film 16 can also have an overlap or be wound in a butt joint.
  • the distance A is, for example, in the range from 1 to 5% of the width B of the outer screen film 16.
  • the fixing film 18 is in particular a plastic carrier film provided with an adhesive layer. This is preferably also wound (in Figure 2 not shown).
  • a plurality of lines 30 are combined in a cable core 32 in a data cable 2, as is shown in FIGS Figures 4, 5 is shown.
  • the cables are each shielded pairs 30.
  • other cable types can also be integrated.
  • two shielded pairs 30 are initially wrapped in a plastic film. This core area is then surrounded on the circumference by a plurality of further pairs 30, which are shielded in the exemplary embodiment 6.
  • the cable core 32 is preferably surrounded by a multi-layer jacket structure.
  • the cable core 32 is generally surrounded by a common outer shield 34.
  • an inner layer of plastic film is additionally wrapped around the cable core 32.
  • the outer shield 34 is constructed in multiple layers with a combination of a foil shield 36 and, for example, a braided shield 38. Finally, this outer screen 34 is surrounded by a common cable sheath 40.
  • Curves A and B show conventional design variants. Curve A represents a shielded pair, which is only wrapped by a single-layer shielding film. In contrast, curve B represents a shielded pair, which is surrounded by a longitudinally folded shielding film.
  • curve B also tends to indicate a course such as is obtained in the previously described winding variant with the inner film 14 wound with only a slight overlap 26.
  • Curve C shows a variant showing a course, such as that with the shortest pitch of the winding of an Al-PET film, e.g. when using a 26AWG wire (American Wire Gauge). With an extremely short winding, the cut-off frequency can therefore be shifted to higher frequencies.
  • Curve D indicates the course of the curve obtained in the second variant described above, in which the outer shielding film 16 is preferably wound with a small gap A in the range of, for example, about 3% of the width of the shielding film 16, such as this too Figure 2 has been described.
  • the inner screen film 14 is preferably wound with a large overlap 26 of, for example, approximately 30% of the width.
  • a pair of wires 4 (curve B) provided with a longitudinally folded shielding film shows a significantly smaller increase in attenuation even in higher frequency ranges of well over 25 GHz even at higher frequencies> 5 GHz.
  • this is bought with an undesirable increase in the so-called common mode signal.
  • the special structure of the pair shield 6 described here gives the following advantages: the resonance effect (which forms a type of bandstop) is prevented or at least shifted to significantly higher frequencies. At the same time, the common mode signal is effectively suppressed by the overlap 26.
  • the disadvantages of a longitudinally folded pair shield are significantly reduced, at the same time the undesirable resonance effect in the case of coiled shields is expanded at least to a non-disturbing frequency range greater than 10 GHz and preferably greater than 15 or 20 GHz.
  • the helical wrapping also simplifies production.
  • film formation requires greater wear.
  • the overlap point also creates an asymmetry and overall the pairs are less flexible due to the longitudinal film.
  • the longitudinal film has disadvantages for production. Each individual dimension requires its own form unit.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Claims (9)

  1. Câble de données (2) pour transmissions de données à haut débit, comprenant au moins une paire de conducteurs (4), qui se compose de deux conducteurs (8) qui sont entourés par un blindage de paire (6) de type à film,
    le blindage de paire (6) possédant un film de blindage interne (14) ainsi qu'un film de blindage externe (16) et les deux films de blindage (14, 16) étant mis en contact électrique l'un avec l'autre et le film de blindage interne (14) étant enroulé autour de la paire de conducteurs (4), le film de blindage externe (16) étant enroulé avec un interstice autour du film de blindage interne (14)
    caractérisé en ce
    que l'interstice est compris dans la plage de 1 à 10 % de la largeur du film de blindage externe (16) et en ce que le film de blindage interne (14) est enroulé avec un chevauchement (26) dans la plage de 20 % à 40 % de la largeur (B) du film de blindage interne (14).
  2. Câble de données (2) selon la revendication précédente, caractérisé en ce qu'il possède plusieurs paires de conducteurs (4) et chacune des paires de conducteurs (4) est entourée par le blindage de paire (6) constitué des deux films de blindage (14, 16).
  3. Câble de données (2) selon l'une des revendications précédentes, caractérisé en ce que les conducteurs (8) suivent un tracé parallèle les uns aux autres.
  4. Câble de données (2) selon l'une des revendications précédentes, caractérisé en ce qu'au moins le film de blindage interne (14) est de configuration multicouche avec une couche conductrice (24) et une couche porteuse (22).
  5. Câble de données (2) selon l'une des revendications précédentes, caractérisé en ce que les deux films de blindage (14, 16) se font mutuellement face avec des couches conductrices (24).
  6. Câble de données (2) selon la revendication précédente, caractérisé en ce que le film de blindage externe (16) est enroulé en sens inverse du film de blindage interne (14).
  7. Câble de données (2) selon l'une des revendications précédentes, caractérisé en ce qu'un fil de masse (20) mis en contact avec au moins l'un des films de blindage (14, 16) est disposé, lequel est disposé au choix entre les films de blindage (14, 16) ou en-dehors du film de blindage externe (16).
  8. Câble de données (2) selon l'une des revendications précédentes, caractérisé en ce que pour une paire de conducteurs (4) respective, un film de blocage (18) est enroulé en complément autour du blindage de paire (6).
  9. Câble de données (2) selon l'une des revendications précédentes, caractérisé en ce qu'il possède une âme de câble (32) comprenant plusieurs lignes (30), au moins une, de préférence plusieurs des lignes (30) étant formées par une paire de conducteurs (4) respective munie du blindage de paire (6) et en ce que l'âme de câble (32) est entourée par un blindage externe (34).
EP15723847.8A 2014-04-25 2015-04-27 Câble de données Active EP3134905B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014207879 2014-04-25
PCT/EP2015/059078 WO2015162297A1 (fr) 2014-04-25 2015-04-27 Câble de données

Publications (2)

Publication Number Publication Date
EP3134905A1 EP3134905A1 (fr) 2017-03-01
EP3134905B1 true EP3134905B1 (fr) 2020-03-18

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EP15723847.8A Active EP3134905B1 (fr) 2014-04-25 2015-04-27 Câble de données

Country Status (6)

Country Link
US (1) US10438724B2 (fr)
EP (1) EP3134905B1 (fr)
JP (1) JP6360912B2 (fr)
CN (1) CN106463212B (fr)
CA (1) CA2946798A1 (fr)
WO (1) WO2015162297A1 (fr)

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CN201616295U (zh) * 2010-02-08 2010-10-27 天津塑力集团超高压电缆有限公司 一种双层间隙屏蔽中压交联电缆
JP2014017131A (ja) * 2012-07-10 2014-01-30 Sumitomo Electric Ind Ltd シールドケーブル

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JP2017514285A (ja) 2017-06-01
CN106463212B (zh) 2018-11-06
CN106463212A (zh) 2017-02-22
EP3134905A1 (fr) 2017-03-01
JP6360912B2 (ja) 2018-07-18
CA2946798A1 (fr) 2015-10-29
US10438724B2 (en) 2019-10-08
US20170103830A1 (en) 2017-04-13

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