EP3166182B1 - System für eine verbindung von koaxial zu streifenleitung - Google Patents

System für eine verbindung von koaxial zu streifenleitung Download PDF

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Publication number
EP3166182B1
EP3166182B1 EP15306755.8A EP15306755A EP3166182B1 EP 3166182 B1 EP3166182 B1 EP 3166182B1 EP 15306755 A EP15306755 A EP 15306755A EP 3166182 B1 EP3166182 B1 EP 3166182B1
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EP
European Patent Office
Prior art keywords
coaxial cable
conductive tube
cylindrical
cylindrical conductive
tube
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.)
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Application number
EP15306755.8A
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English (en)
French (fr)
Other versions
EP3166182A1 (de
Inventor
Patrick Le Cam
Eric CALLEC
Sébastien CHAINON
Thomas Julien
Jean-Pierre Harel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
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Publication date
Application filed by Alcatel Lucent Shanghai Bell Co Ltd filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to EP15306755.8A priority Critical patent/EP3166182B1/de
Publication of EP3166182A1 publication Critical patent/EP3166182A1/de
Application granted granted Critical
Publication of EP3166182B1 publication Critical patent/EP3166182B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0515—Connection to a rigid planar substrate, e.g. printed circuit board
    • 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
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02—Soldered or welded connections
    • H01R4/023—Soldered or welded connections between cables or wires and terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0075—Stripline fed arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/62—Connections between conductors of different materials; Connections between or with aluminium or steel-core aluminium conductors
    • H01R4/625—Soldered or welded connections

Definitions

  • a coaxial cable comprises: an outer insulating jacket, a conducting shield generally made of a braid, a dielectric layer, and an inner conductor.
  • a stripline is a radiofrequency transmission line that comprises an inner conductor and two parallel ground planes.
  • the inner conductor of a stripline is a flat strip of metal which is placed in between the two parallel ground planes.
  • the flat strip of metal is separated of both ground planes by two dielectric layers. The invention more peculiarly concerns the striplines wherein the dielectric layer is air.
  • the system according to the invention can be used in a wireless network base station.
  • a base station antenna is built with at least one array of radiating elements, connected to a feeding network (power dividers and phase shifters) by means of striplines wherein the dielectric layers are air.
  • the market of wireless network base stations requires more and more complex antennas: Dual polarization, multiband (pentaband or more), and multi-input-multi-output (MIMO) arrays of radiating elements.
  • each radiating element comprises a short line that is generally connected to a stripline of a feeding network by means of a coaxial cable, because it is almost impossible to obtain satisfactory Passive Inter Modulation (PIM) performances if several striplines or printed circuit board microstriplines are interleaved for constructing the feeding network.
  • PIM Passive Inter Modulation
  • the most efficient feeding network technology is stripline, and preferably air stripline, as air is the minimum loss and cheapest dielectric available. So there are many coaxial to stripline connections in an antenna of a base station.
  • the inner conductor of a stripline and the inner conductor of a coaxial cable are generally made of a copper alloy, so there is no problem to connect them by means of tin solder.
  • the shield of a coaxial cable is often made of copper alloy that can be tin soldered.
  • the subcomponents of an antenna, in particular the two ground planes of a stripline are made of materials that cannot be tin soldered (For instance, aluminum alloys that are much cheaper than copper alloys). So the shield and a ground plane cannot be connected by means of tin solder. So another kind of junction is needed to connect a ground plane of a stripline and the shield of a coaxial cable.
  • a first problem to be solved for this junction is to obtain satisfactory PIM performances.
  • a second problem to be solved is to obtain a very low manufacturing cost because, in such a complex antenna, there are a lot of these connections. For example, in a pentaband antenna, there are more than one hundred such coaxial cable to stripline connections.
  • prior art document JPS4868789U discloses a system for connecting a shield 172 of a coaxial cable 16 to a ground plane 11; and prior art documents US2015/311605A1 and US2014/011399A1 present other systems to connect the shield of a coaxial cable to ground planes.
  • US2015/311605A1 the shield 22 of a coaxial cable is connected to a ground track 38 through a middle plate 56.
  • a solder 601 is used to electrically connect a shield of a coaxial cable 102 to a ground plane 101.
  • the object of the invention is a system comprising a coaxial cable (CO) and a first and second ground planes (GP1, GP2), for connecting the shield of the coaxial cable to a first ground plane of a stripline, this system further comprising a grounding interface part, a solder, and tightening means; said grounding interface part comprising a first area that can be soldered to the shield of the coaxial cable by means of said solder, a second area and a third area that can be respectively pressed onto the first and second ground planes by the tightening means so that the second area is in electrical contact with the first ground plane and the third area is in electrical contact with the second ground plane; characterized in that:
  • the main part of the grounding interface part is the cylindrical conductive tube.
  • This cylindrical conductive tube must be made from hard material. The hard material avoids collapsing during the screw tightening operation, which would generate PIM immediately.
  • the advantage of a cylindrical conductive tube with respect to the second family of known solutions, is that the simplicity of the cylindrical shape allows low manufacturing cost, since the cylindrical conductive tube can be manufactured by a mere cutting operation of a standard pipe.
  • the centering tube can be made of cheap molded plastic.
  • the grounding interface part comprises very few parts and they are cheap, while providing the pressure needed for a good contact, i. e. preventing the creation of PIM.
  • a first embodiment of the system according to the invention is connecting the shield SH of a coaxial cable CO to the two parallel ground planes of a stripline.
  • the coaxial cable CO comprises:
  • This first embodiment of the system according to claim 1 comprises a grounding interface part GIP that is soldered to the shield SH by a tin solder TS, and that is pressed onto both ground plates by tightening means comprising a thread rod TR.
  • the threaded rod TR is a stud welded to the ground plane GP1 (It could be a bolt or a screw as well), and a skirt nut (not represented on Figures 1-3 ) screwed onto of the threaded rod TR and pressing on the second ground plate (not represented).
  • the grounding interface part GIP comprises:
  • the cylindrical conductive tube T1 can be portion of a standard tube (for example a standard brass tube 6 x 8 mm).
  • the machining process is reduced to cutting the tube (this is a low cost operation).
  • the braid constituting the shield SH is directly soldered on the side of the cylindrical conductive tube T1 at a well defined position, by means of positioning tool.
  • the soldering operation can be automated (with an induction soldering machine) to reduce the process cost.
  • the centering tube T2 is inserted around the threaded rod TR: Its action will be to ensure that the contact is uniformly done on a clean and flat surface of the ground plates and not on the side of the hole, which would generate immediately PIM.
  • Figure 3 only represents the threaded rod TR and the dielectric cylindrical tube T2 of this first embodiment, after the dielectric cylindrical tube T2 has been slip on the threaded rod TR, and before the cylindrical conductive tube T1 (soldered to the shield SH) has been slip on the cylindrical centering tube T2. Then the cylindrical conductive tube T1, soldered to the shield SH, is inserted around the centering tube T2.
  • the second ground plate (not represented on the figures 1-3 ) will be placed in front of the first ground plate GP1, and the threaded rod TR will be traversing the second ground plate, so that the cylindrical conductive tube T1 will be pressed between the two ground plates when a skirt nut is screwed on the threaded rod TR.
  • the cylindrical conductive tube T1 will constitute a spacer that defines the width between the two ground plates.
  • Figure 4 represents a perspective view of a second embodiment further comprising a cable guide CG. It shows a stripline SL comprising:
  • This second embodiment comprises a grounding interface part GIP similar to the one that has been described with reference to Figures 1-3 . It is installed between the two ground plates GP1 and GP2.
  • the cylindrical conductive tube of this grounding interface GIP constitutes a spacer between the parallel ground plates GP1, GP2 and is in electrical contact with both of them.
  • This cylindrical conductive tube has been tin soldered to the shield SH of the coaxial cable CO, as explained with reference to the Figures 1-3 .
  • This second embodiment further comprises a cable guide CG that guides the coaxial cable CO while traversing a side wall of the ground plate GP2, through a rectangular opening O.
  • This cable guide CG holds the coaxial cable CO with an angle of about thirty degrees with respect to the longitudinal axis of the two ground plates GP1, GP2, so that it aligned with the end of the inner conductor IC2 of the stripline SL.
  • a first benefit of this coaxial cable guide CG is to avoid a rotation of the coaxial cable CO and of the cylindrical conductive tube T1 of the grounding interface GIP, around the threaded rod TR, during the soldering operation of the inner conductor IC1 of the coaxial cable CO at the end of the inner conductor IC2 of the stripline SL.
  • a second benefit is to maintain the inner conductor IC2 of the stripline SL at the right distance between the two ground plates GP1 and GP2, thus avoiding the need of a specific tool during assembly process. The result is a quicker and more reliable assembly process.
  • a third benefit is also to protect the jacket J and the shield SH of the coaxial cable CO against a damaging by the edges of the ground plates GP1, GP2, in the opening O.
  • Figures 5 and 6 represent two perspective views of the cable guide CG used in the second embodiment. It is made of a molded plastic material, and it comprises a plane base B that lies on the inner face of the grounding plate GP1. It comprises a through hole H having a diameter slightly greater than the diameter of the cylindrical conductive tube T1 of the grounding interface part GIP. This through hole H enables to insert the cable guide CG around the grounding interface part GIP, before soldering the inner conductors IC1 and IC2 together.
  • the base plane B also comprises two teeth T1 and T2 that are destinated to be snapped into two corresponding holes (Not represented) in the inner face of the grounding plate GP1. These teeth T1 and T2 prevent any rotation of the cable guide CG around the grounding interface part GIP.
  • An edge of the base B comprises a part S that is thicker than the rest of the plane base B.
  • This part S is U shaped because it comprises a notch N, such that the bottom of the notch has a thickness lower or equal to the width of the slot ST1, and its width is slightly greater that the thickness of a side wall of the ground plate GP2.
  • the U shaped part S straddles the side wall SW2 of the ground plate GP2.
  • the U shaped part S comprises a second notch at an angle of thirty degrees with the first notch N. This second notch creates a pit P1 on one side of the notch N, and a second pit P2 on the other side of the notch N.
  • These two pits P1 and P2 create a passage way through the U shaped part S, for the coaxial cable CO. This passage way guides the coaxial cable CO.
  • grounding interface part GIP comprises very few parts and they are cheap.
  • a single screw or stud, with a nut, is enough for providing the pressure needed for a good contact, i. e. preventing the creation of PIM.
  • the system according to the invention has been described in the context of a wireless base station, but this system can be used in any kind of device comprising coaxial cables connected to striplines, in any frequency band.

Landscapes

  • Cable Accessories (AREA)
  • Waveguide Aerials (AREA)

Claims (2)

  1. System, umfassend ein Koaxialkabel (CO) und eine erste und eine zweite Grundplatte (GP1, GP2) zum Verbinden der Abschirmung (SH) des Koaxialkabels (CO) mit der ersten und der zweiten Grundplatte (GP1, GP2) einer Streifenleitung (SL), wobei dieses System weiterhin umfasst ein Erdungsschnittstellenteil (GIP), Lötmetall (TS) und Befestigungsmittel (TR, NT); wobei besagtes Erdungsschnittstellenteil (GIP) einen ersten Bereich (A1) umfasst, der mit der Abschirmung (SH) des Koaxialkabels verlötet werden kann mittels besagten Lötmetalls (TS), und einen zweiten Bereich (A2) und einen dritten Bereich (A3), die jeweils auf die erste und zweite Grundplatte (GP1, GP2) gedrückt werden können mittels der Befestigungsmittel (TR, NT), sodass sich der zweite Bereich (A2) in elektrischem Kontakt mit der ersten Grundplatte (GP1) befindet und der dritte Bereich (A3) sich in elektrischem Kontakt befindet mit der zweiten Grundplatte (GP2); dadurch gekennzeichnet, dass:
    - besagter Erdungsschnittstellenteil (GIP) ein zylindrisches leitendes Rohr (T1) umfasst, sodass:
    - der erste Bereich (A1) von besagtem Erdungsschnittstellenteil (GIP) die äußere zylindrische Oberfläche des zylindrischen leitenden Rohres (T1) umfasst, wobei diese äußere zylindrische Oberfläche mit der Abschirmung (SH) des Koalxialkabels (CO) verlötet ist, sodass die Drehachse (AA) des zylindrischen leitenden Rohres (T1) orthogonal zur Längsachse (BB) des Koaxialkabels (CO) steht;
    - der zweite Bereich (A2) von besagtem Erdungsschnittstellenteil (GIP) ein erstes Ende des zylindrischen leitenden Rohres (T1) umfasst, wobei dieses erste Ende plan ist und orthogonal zur Drehachse (AA) besagten leitenden zylindrischen Rohres (T1) steht;
    - der dritte Bereich (A3) ein zweites Ende des zylindrischen leitenden Rohres (T1) umfasst, wobei diese zweite Ende plan ist und orthogonal zur Drehachse (AA) besagten zylindrischen leitenden Rohres steht;
    - besagtes Erdungsschnittstellenteil (GIP) weiterhin umfasst ein zylindrisches Zentrierrohr (T2), das eng im zylindrischen leitenden Rohr (T1) anliegt und eine geringere oder gleiche Länge aufweist wie die Länge des zylindrischen leitenden Rohres (T1);
    - die Befestigungsmittel umfassen:
    - eine Gewindestange (TR) eng in dem zylindrischen Zentrierrohr (T2) anliegt, wobei diese Gewindestange eine größere Länge aufweist als die Länge des zylindrischen leitenden Rohres (T1),
    - und mindestens einen Bolzen (BT), der auf besagte Gewindestange (TR) geschraubt ist.
  2. System nach Anspruch 1, weiterhin umfassend eine Kabelführung (CG) zum Führen des Koaxialkabels (CO), während es eine Seitenwand (SW2) einer Grundplatte (GP2) besagter Streifenleitung (SL) durchläuft, durch eine Öffnung (O), wobei dieses Kabelführung (CG) das Koaxialkabel (CO) in einem festen Winkel in Bezug auf die Längsachse der zwei Grundplatten (GP1, GP2) hält, sodass er eine Rotation des Koaxialkabels (CO) um die Erdungsschnittstelle (GIP) verhindert und das Koaxialkabel (CO) in einem vorbestimmten Abstand zwischen den zwei Grundplatten (GP1, GP2) der Streifenleitung (SL) hält.
EP15306755.8A 2015-11-05 2015-11-05 System für eine verbindung von koaxial zu streifenleitung Active EP3166182B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15306755.8A EP3166182B1 (de) 2015-11-05 2015-11-05 System für eine verbindung von koaxial zu streifenleitung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15306755.8A EP3166182B1 (de) 2015-11-05 2015-11-05 System für eine verbindung von koaxial zu streifenleitung

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EP3166182B1 true EP3166182B1 (de) 2018-08-08

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Publication number Priority date Publication date Assignee Title
CN109687100B (zh) * 2017-10-18 2020-11-06 康普技术有限责任公司 其中有具有减少的无源互调失真的馈电板的基站天线组件
CN111312446A (zh) * 2020-02-20 2020-06-19 云南电网有限责任公司电力科学研究院 同轴电缆及其传输信号组件

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Publication number Priority date Publication date Assignee Title
JPS522868Y2 (de) * 1971-12-06 1977-01-21
US9033731B2 (en) * 2012-07-05 2015-05-19 Apple Inc. Grounding clamp
US9356366B2 (en) * 2014-04-24 2016-05-31 Tyco Electronics Corporation Cable connector assembly for a communication system

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