EP2401786B1 - Mechanische und elektrische verbindungsvorrichtung für ein koaxialkabel zur übermittlung eines hochfrequenzsignals - Google Patents

Mechanische und elektrische verbindungsvorrichtung für ein koaxialkabel zur übermittlung eines hochfrequenzsignals Download PDF

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Publication number
EP2401786B1
EP2401786B1 EP10710072A EP10710072A EP2401786B1 EP 2401786 B1 EP2401786 B1 EP 2401786B1 EP 10710072 A EP10710072 A EP 10710072A EP 10710072 A EP10710072 A EP 10710072A EP 2401786 B1 EP2401786 B1 EP 2401786B1
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EP
European Patent Office
Prior art keywords
mechanical
ground plane
connection device
electric connection
coaxial cable
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EP10710072A
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English (en)
French (fr)
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EP2401786A1 (de
Inventor
Jean-Pierre Harel
Patrick Lecam
Gérard JACOB
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/085—Coaxial-line/strip-line transitions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/08—Microstrips; Strip lines
    • H01P3/085—Triplate lines

Definitions

  • the present invention relates to a device for establishing a mechanical and electrical connection between a coaxial cable carrying a high frequency signal and a circuit comprising multilayer lines of microstrip or microband type ("microstrip” in English) or triplate type ( "stripline” in English).
  • This mechanical and electrical connection device may belong for example to a radio frequency module fixed in a base station equipment bay.
  • a conductive grounded surface commonly referred to as a ground plane
  • a conductive track is disposed on one of the faces of a planar dielectric substrate.
  • a conductive track is joined on the other side of the dielectric substrate.
  • the microstrip lines are generally in the form of a printed circuit plated on one side of a dielectric substrate, the opposite metallized face and connected to the ground constitutes the plane massive.
  • a triplate type configuration two continuous conductive plates connected to the earth are arranged parallel to each other on either side of a conductive track. Each conductive plate is isolated from the conductive track by a dielectric layer.
  • the ground plane may be of non-weldable material, such as aluminum
  • the central inner conductor of the coaxial cable is then welded to the conductive track of the microstrip line or triplate.
  • the present invention aims to eliminate the disadvantages of the prior art.
  • the invention proposes a mechanical and electrical connection device between a coaxial cable carrying a high frequency signal and a multilayer line (microstrip or triplate) which is inexpensive, easy and quick to set up, while ensuring an electrical connection. reliable for use in the radio frequency domain.
  • the mechanical and electrical connection device allows galvanic isolation by eliminating any direct contact between the different parts acting as a ground plane in radio frequency use.
  • the connection between ground planes is carried out by capacitive coupling, made by putting vis-à-vis (but without direct contact) layers of conductive materials.
  • the present invention allows a fast and efficient positioning of the various components of the mechanical and electrical connection device.
  • the conductive surface is electrically connected to the external conductor.
  • the mechanical fixing means comprises at least one relief of dielectric material adapted to be inserted into a fitted orifice formed in the ground plane.
  • the reliefs are in the form of hooks which allow rapid assembly by snapping into a hole of suitable size of the ground plane.
  • the reliefs have the form of pins for positioning the mechanical and electrical connection device vis-à-vis the ground plane.
  • Fixing the mechanical and electrical connection device may be made by nuts, bolts and / or rivets for example plastic.
  • the conductive surface of the mechanical and electrical connection device is electrically connected to the outer conductor of the coaxial cable by welding or brazing.
  • the mechanical and electrical connection device is mechanically connected to the ground plane by means of at least one relief of dielectric material adapted to be inserted into a fitted orifice formed in the ground plane.
  • the mechanical and electrical connection device is mechanically connected to the ground plane by latching the hook-shaped reliefs in a fitted orifice formed in the ground plane.
  • the mechanical and electrical connection device is mechanically connected to the ground plane by insertion of the pion-shaped reliefs in a fitted orifice formed in the ground plane.
  • the present invention has the advantage of allowing inexpensive and fast assembly of the components involved.
  • the solder is removed from the ground plane on the mechanical and electrical connection device by replacing it with a capacitive electrical connection.
  • the ground plane can then be made of a material which is not necessarily weldable, therefore of lower cost.
  • connection is made with fasteners of dielectric material.
  • the connection can in particular be made by snapping a relief, by clamping by means of clips, or by positioning by means of pins and fixing. The method according to the invention allows a fast, precise and safe assembly.
  • a coaxial cable 1 having a central metal conductor 2 , an external conductor 3 supplied with alternating current, often having the appearance of a metal or metallized braid, and a layer of dielectric material 4 placed between the two conductors 2, 3.
  • the cable 1 is connected to a multilayer line 5 of triplate type comprising a conductive track 6 sandwiched between two conductive surfaces 7.
  • the conductive surfaces 7, metallic or metallized, and connected to the earth, constitute the plans mass of the multilayer line 5.
  • the conducting track 6 is separated from the conductive surfaces 7 placed on either side by a dielectric layer 8, in this case air, ensuring galvanic isolation.
  • the inner conductor 2 of the coaxial cable 1 is electrically connected to the conductive track 6 of the multilayer line 5, for example by welding.
  • the mechanical and electrical connection device according to a first embodiment of the invention, comprises a conductive connecting body 9 in the form of a coated U-shape, the outer face of the branches of the U being covered with a layer of a dielectric material 10 which insulates the connection body 9 of the ground plane 7 to avoid direct contact metal-metal.
  • the outer conductor 3 of the coaxial cable 1 is electrically connected to the connection body 9, for example by welding.
  • the mechanical and electrical connection device also comprises a fixing piece 11 made of dielectric material comprising, on either side, reliefs 12 adapted to snap into openings provided for this purpose in the ground planes 7, in order to simultaneously position and fix the mechanical and electrical connection device on the ground planes 7.
  • the mechanical and electrical connection device 30 consists of a connecting body 31, an insulating member 32 and a fastener 33.
  • the connecting body 31 has the shape of a lying down U.
  • the connection body 31 is made of conductive material, such as brass, copper, etc., or else any other material covered with a conductive material such as tin, silver, gold, etc.
  • the two branches 34 of the U constitute coupling surfaces vis-à-vis a ground plane
  • the portion 35 located between the two branches 34 of the U comprises an opening 36 for the passage of the inner conductor of a coaxial cable.
  • the insulating element 32 is U-shaped lying in the opposite direction of the connection body 31, so as to be able to position around the connection body 31.
  • the two branches 37 of the insulating element 32 thus cover the two branches 34 of the connection body 31 respectively to form a dielectric layer insulating the connection body 31 of the ground planes arranged on either side.
  • the portion 38 located between the two branches 37 of the U comprises an opening 39 for the passage of the coaxial cable.
  • the insulating element 32 is made of a dielectric material such as a polymer such as polyethylene.
  • the fastener 33 comprises a core 40 adapted to be inserted inside the connection body 31, bearing reliefs 41 in the form of a hook which project upwards and downwards in the direction of the ground planes. Notches 42 and 43 are formed respectively on each edge of the branches 34 of the connection body 31 and the branches 37 of the insulating element 32 for the passage of the reliefs 41.
  • the hooks 41 together retain by spring effect the connecting body 31 and the insulating element 32.
  • the core 40 is shaped so as to guide and support the coaxial cable.
  • the fastener 33 is made of dielectric material, for example a plastic.
  • the mechanical and electrical connection device is compact as shown in FIG. figure 4 , and has the mechanical strength necessary for its function.
  • connecting body and the fastener can be made in one piece in a single piece made of dielectric material, some surfaces being covered with metal to form coupling surfaces.
  • the insulating element can be reduced to an insulating film deposited on the conductive surfaces, provided that there is effective insulation between the conductive surface and the ground plane placed in facing relation.
  • a sheet of dielectric material may be bonded to each conductive surface.
  • the Figures 5 and 6 show how the mechanical and electrical connection device represented on the Figures 3 and 4 cooperates with a coaxial cable 50 comprising an inner conductor 51 and an outer conductor 52 separated by a dielectric layer 53, the assembly being protected by an insulating sheath 54 of dielectric material such as polyethylene (PE) or polytetrafluoroethylene (PTFE).
  • PE polyethylene
  • PTFE polytetrafluoroethylene
  • connection between a coaxial cable 50 and a multilayer line begins by establishing an electrical continuity between the outer conductor 52 of the cable 50 and the connecting body 31, for example by welding, leaving the inner conductor pass 51 through the orifice 36.
  • the fastener 33 By sliding along the cable 50, is then inserted the fastener 33 inside the connecting body 31 by positioning the reliefs 41 of the fastener 33 in the notches 42 of the body of connection 31.
  • the insulating element 32 is threaded onto the cable through the orifice 39 and slid so as to cover the connection body 31, the notches 43 of the connection body 31 coming to be placed on the reliefs 41 of the connecting piece. fixing 33.
  • the junction of the coaxial cable 50 provided with its mechanical and electrical connection device with the multilayer line it starts by snapping two hooks 41 of the fastener 33 into openings provided for this purpose in the first of the two ground planes of the triplate line.
  • the electrical conductor 51 of the coaxial cable 50 is then electrically connected to the conductive track of the triplate line.
  • the two other hooks 41 of the fastener 33 are snapped into openings provided for this purpose in the second of the two ground planes of the strip line.
  • a mechanical and electrical connection device according to the embodiment of the Figures 3 to 6 in a fixed position on a ground plane of a multilayer line of microstrip or microstrip type.
  • the mechanical and electrical connection device 70 enclosing a coaxial cable 71 is placed on a conductive surface 72 constituting the ground plane of a multilayer line of microstrip type.
  • the reliefs 73 of the fastener insert into orifices 74 of the ground plane and retain it by spring effect, to maintain the mechanical and electrical connection device attached to the ground plane.
  • FIG. 8 a mechanical and electrical connection device according to the embodiment of the Figures 3 to 6 in a fixed position on a multilayer line of triplate type.
  • the mechanical and electrical connection device 80 enclosing a coaxial cable 81 is interposed between two conductive surfaces 82 constituting the ground planes of a multilayer line of triplate type.
  • the hook-shaped reliefs 83 of the fastener insert into orifices 84 of the ground planes and hold them by spring effect, to maintain the mechanical and electrical connection device attached to the two ground planes of the part and the ground plane. other.
  • the mechanical and electrical connection device 90 consists of a connecting body 91, an insulating member 92 and a fastener 93.
  • This third embodiment differs from the second embodiment in that the fixing piece 93 comprises a core 94 adapted to be inserted inside the connecting body 91, bearing reliefs 95 in the form of a pin intended for ensure the positioning of the mechanical and electrical connection device 90 vis-à-vis the ground planes.
  • Notches 96 and 97 are formed respectively on the connection body 91 and on the insulating element 92 for the passage of the positioning pins 95.
  • the Figures 11 and 12 show how the mechanical and electrical connection device represented on the Figures 9 and 10 cooperates with a coaxial cable 100 comprising an inner conductor 101 and an outer conductor 102.
  • the cable 100 enters the mechanical and electrical connection device through the orifice 103 of the insulating element 104.
  • the cable 100 is guided by the fixation 105 placed inside the connecting body 106, so that the inner conductor 101 exits through the hole 107 of the connection body 106.
  • a mechanical and electrical connection device according to the embodiment of the Figures 9 to 12 in a fixed position on a ground plane of a multilayer line of microstrip or microstrip type.
  • the mechanical and electrical connection device 130 enclosing a coaxial cable 131 is placed on a conductive surface 132 constituting the ground plane of a multilayer line of microstrip type.
  • the reliefs 133, forming positioning pins, of the fastening piece 134 fit into orifices 135 of the ground plane.
  • FIG 14 a mechanical and electrical connection device according to the embodiment of the Figures 9 to 12 in a fixed position on a multilayer line of triplate type.
  • the mechanical and electrical connection device enclosing a coaxial cable 140 is interposed between two conductive surfaces 141, 142 constituting the ground planes of a multilayer line of triplate type.
  • the positioning pins 143 of the fastening part of the mechanical and electrical connection device are inserted into orifices 144 of the ground planes.
  • the junction of the coaxial cable 140 provided with its mechanical and electrical connection device with the triplate line.
  • the electrical conductor of the coaxial cable 140 is then electrically connected to the conductive track of the triplate line. Finally the two other positioning pins 143 of the fastener are inserted into openings provided for this purpose in the second of the two ground planes of the multilayer line. Fixing the mechanical and electrical connection device to the two ground planes on either side is provided by nuts 145 of dielectric material.
  • the figures 15a at 18b represent different form variants of the connection body.
  • connection body 150 has a coated P-shape having two surfaces 151 and 152 for the capacitive coupling with the ground planes located above and below the mechanical and electrical connection device.
  • FIG. 16a and 16b shows an alternative embodiment according to which the connecting body 160 has an N-shape extending by two surfaces 161 and 162 outward facing for capacitive coupling with ground planes above and below the mechanical and electrical connection device.
  • connection body 170 has an N-shape extending by two surfaces 171 and 172 facing inwards for the capacitive coupling with the ground planes located above and below the device of FIG. mechanical and electrical connection.
  • FIGS. 18a and 18b shows an alternative embodiment according to which the connecting body 180 has a shape of an open recumbent anvil at one end having two surfaces 181 and 182, composed each of two sections 181a, 181b and 182a, 182b respectively, for the capacitive coupling with the ground planes above and below the mechanical and electrical connection device.
  • the curve 190 serves as a reference and corresponds to the case where the ground planes are in direct electrical contact.
  • the curves 191, 192 and 193 show this evolution for thicknesses of 0.1 mm, 0.2 mm and 0.3 mm respectively.
  • the figure 19b represents the insertion loss A as a function of the frequency ⁇ for increasing values of the thickness of a polyethylene dielectric layer.
  • the curve 194 serves as a reference and corresponds to the case where the ground planes are in direct electrical contact.
  • Curves 195, 196 and 197 show the evolution for thicknesses of 0.1 mm, 0.2 mm and 0.3 mm, respectively, over the radio frequency range from 0.1 GHz to 4 GHz.
  • the capacitive coupling will be all the more effective if the thickness of the dielectric layer is small.
  • the optimum thickness of the dielectric layer depends on the dielectric constant of the material used. It is also known that the capacitive coupling will be more effective than the coupling surface will be important.
  • the thickness of the dielectric layer and the coupling surface must be optimized according to the working frequency range, including the center frequency and the frequency band range.

Landscapes

  • Multi-Conductor Connections (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Communication Cables (AREA)
  • Cable Accessories (AREA)

Claims (9)

  1. Vorrichtung zur mechanischen und elektrischen Verbindung zwischen einer mehrschichtigen Leitung (5), welche eine Leiterbahn (6) und mindestens eine Masseebene (7) umfasst, und einem Koaxialkabel (1), welches ein Hochfrequenzsignal transportiert und einen Innenleiter (2) und einen Außenleiter (3) umfasst, wobei die Vorrichtung zur mechanischen und elektrischen Verbindung gekennzeichnet ist durch:
    - Ein Mittel zur elektrischen Verbindung zwischen dem Koaxialkabel (1) und der Masseebene (7) der mehrschichtigen Leitung (5), welche eine gegenüber der Masseebene (7) der mehrschichtigen Leitung (5), von welcher sie durch eine Schicht aus dielektrischem Material (10) getrennt ist, angeordnete leitende Fläche (9) umfasst, so dass eine kapazitive elektrische Verbindung zwischen der leitenden Fläche (9) und der Masseebene (7) hergestellt wird, und
    - ein mechanisches Befestigungsmittel mit mindestens einem Relief (12) aus dielektrischem Material, welches geeignet ist, in eine in der Masseebene (7) eingelassene Öffnung einzugreifen.
  2. Vorrichtung zur mechanischen und elektrischen Verbindung nach Anspruch 1, wobei die leitende Fläche (9) elektrisch mit dem Außenleiter (3) des Koaxialkabels (1) verbunden ist.
  3. Vorrichtung zur mechanischen und elektrischen Verbindung nach einem der Ansprüche 1 und 2, wobei das Relief (12) die Form eines Hakens aufweist, um eine Verbindung durch Einrasten zu ermöglichen.
  4. Vorrichtung zur mechanischen und elektrischen Verbindung nach einem der Ansprüche 1 und 2, wobei das Relief (12) die Form eines Stiftes aufweist, um die Positionierung zu ermöglichen.
  5. Verfahren zur mechanischen und elektrischen Verbindung eines Koaxialkabels (1), welches einen Innenleiter (2) und einen Außenleiter (3) umfasst, mit einer mehrschichtigen Leitung (5), welche eine Leiterbahn (6) und mindestens eine Masseebene (7) umfasst, wobei das Verfahren dadurch gekennzeichnet ist, dass anhand einer Vorrichtung zur mechanischen und elektrischen Verbindung mit einem Mittel zur elektrischen Verbindung zwischen dem Koaxialkabel (1) und der Masseebene (7) der mehrschichtigen Leitung (5), mit einer gegenüber der Masseebene (7) der mehrschichtigen Leitung (5), von welcher sie durch eine Schicht aus dielektrischem Materiel (10) getrennt ist, angeordneten leitenden Fläche (9), und eines mechanischen Befestigungsmittels mit mindestens einem Relief (12) aus dielektrischem Material, welches geeignet ist, in eine in der Masseebene (7) eingelassene Öffnung einzugreifen :
    - der Außenleiter (3) des Koaxialkabels (1) elektrisch an die leitende Fläche (9) der Vorrichtung zur mechanischen und elektrischen Verbindung angeschlossen wird,
    - eine Schicht aus dielektrischem Material (10) auf der leitenden Fläche (9) der Vorrichtung zur mechanischen und elektrischen Verbindung angeordnet wird,
    - die Masseebene (7) der mehrschichtigen Leitung (5) gegenüber der leitenden Fläche (9) der Vorrichtung zur mechanischen und elektrischen Verbindung derart angeordnet wird, dass eine kapazitive elektrische Verbindung zwischen der leitenden Fläche (9), welche elektrisch mit dem Außenleiter (3) des Koaxialkabels (1) verbunden ist, und der Masseebene (7) der mehrschichtigen Leitung hergestellt wird,
    - die Vorrichtung zur mechanischen und elektrischen Verbindung anhand einer mechanischen Befestigung mechanisch mit der Masseebene (7) verbunden wird, und
    - der Innenleiter (2) des Koaxialkabels (1) elektrisch mit der Leiterbahn (6) der mehrschichtigen Leitung (5) verbunden wird.
  6. Verfahren zur mechanischen und elektrischen Verbindung nach Anspruch 5, wobei die leitende Fläche (9) der Vorrichtung zur mechanischen und elektrischen Verbindung durch Schweißen oder Löten elektrisch mit dem Außenleiter (3) des Koaxialkabels (1) verbunden wird.
  7. Verfahren zur mechanischen und elektrischen Verbindung nach Anspruch 5 und 6, wobei die Vorrichtung zur mechanischen und elektrischen Verbindung anhand mindestens eines Reliefs (12) aus dielektrischem Material, welches geeignet ist, in eine zu diesem Zweck in der Masseebene (7) eingelassene Öffnung einzugreifen, mechanisch mit der Masseebene verbunden wird.
  8. Verfahren zur mechanischen und elektrischen Verbindung nach Anspruch 7, wobei die Vorrichtung zur mechanischen und elektrischen Verbindung durch Einrasten mindestens eines hakenförmigen Reliefs (12) in einer zu diesem Zweck in der Masseebene (7) eingelassenen Öffnung mechanisch mit der Masseebene (7) verbunden wird.
  9. Verfahren zur mechanischen und elektrischen Verbindung nach Anspruch 7, wobei die Vorrichtung zur mechanischen und elektrischen Verbindung durch Eingreifen mindestens eines stiftförmigen Reliefs (12) in eine zu diesem Zweck in der Masseebene (7) eingelassene Öffnung elektrisch mit der Masseebene (7) verbunden wird.
EP10710072A 2009-02-25 2010-02-17 Mechanische und elektrische verbindungsvorrichtung für ein koaxialkabel zur übermittlung eines hochfrequenzsignals Active EP2401786B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0951193A FR2942569B1 (fr) 2009-02-25 2009-02-25 Dispositif de connexion pour un cable coaxial transportant un signal haute frequence.
PCT/FR2010/050267 WO2010097535A1 (fr) 2009-02-25 2010-02-17 Dispositif de liaison mecanique et electrique pour un cable coaxial transportant un signal haute frequence

Publications (2)

Publication Number Publication Date
EP2401786A1 EP2401786A1 (de) 2012-01-04
EP2401786B1 true EP2401786B1 (de) 2013-01-23

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Country Link
US (1) US8449305B2 (de)
EP (1) EP2401786B1 (de)
JP (1) JP5323949B2 (de)
CN (1) CN102334232B (de)
BR (1) BRPI1008730B1 (de)
FR (1) FR2942569B1 (de)
WO (1) WO2010097535A1 (de)

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Publication number Publication date
FR2942569B1 (fr) 2011-03-25
WO2010097535A1 (fr) 2010-09-02
BRPI1008730A2 (pt) 2016-03-08
EP2401786A1 (de) 2012-01-04
BRPI1008730B1 (pt) 2020-12-22
CN102334232B (zh) 2014-08-13
US8449305B2 (en) 2013-05-28
JP2012518963A (ja) 2012-08-16
CN102334232A (zh) 2012-01-25
FR2942569A1 (fr) 2010-08-27
US20120244727A1 (en) 2012-09-27
JP5323949B2 (ja) 2013-10-23

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