EP3249741B1 - Dispositif pour la connexion entre une ligne ruban et un câble coaxial - Google Patents

Dispositif pour la connexion entre une ligne ruban et un câble coaxial Download PDF

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Publication number
EP3249741B1
EP3249741B1 EP16305603.9A EP16305603A EP3249741B1 EP 3249741 B1 EP3249741 B1 EP 3249741B1 EP 16305603 A EP16305603 A EP 16305603A EP 3249741 B1 EP3249741 B1 EP 3249741B1
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EP
European Patent Office
Prior art keywords
circuit board
printed circuit
cover
coaxial cable
coupling area
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.)
Active
Application number
EP16305603.9A
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German (de)
English (en)
Other versions
EP3249741A1 (fr
Inventor
Aurélien Hilary
Patrick Lecam
Jean-Pierre Harel
Zied Charaabi
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
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Nokia Shanghai Bell Co Ltd
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Publication date
Application filed by Nokia Shanghai Bell Co Ltd filed Critical Nokia Shanghai Bell Co Ltd
Priority to EP16305603.9A priority Critical patent/EP3249741B1/fr
Publication of EP3249741A1 publication Critical patent/EP3249741A1/fr
Application granted granted Critical
Publication of EP3249741B1 publication Critical patent/EP3249741B1/fr
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Classifications

    • 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

Definitions

  • the present subject matter relates to a device for the connection between a strip line and a coaxial cable.
  • the strip line is realized on a printed circuit board.
  • This device allows the transition between a coaxial cable and a suspended stripline and is also known as junction.
  • Base station antennas are built with arrays of several radiating elements, connected to distribution networks (power dividers, phase shifters) with transmission lines. It is also known the US patent applications references US2003/218515 and US2012/244727 .
  • Patent application US2003218515 relates to a radio frequency circuit module, formed by mounting circuit elements on a circuit substrate having dielectric layers for a module and a communication apparatus using the radio frequency circuit.
  • Patent application US2012244727 relates to a device for the mechanical and electric connection between a coaxial cable conveying a high frequency signal and a circuit comprising multilayer microstrip or stripline lines.
  • Patent US3587004 relates to contradirectional couplers and, more particularly, to transmission line power dividers employing contradirectional couplers.
  • Patent US8362856 relates to a radio frequency (RF) transition for a three dimensional molded RF structure. More specifically, the invention relates to an RF transition from a microstrip transmission line to a suspended substrate transmission line used in conjunction with the RF structure.
  • RF radio frequency
  • the problem solved by the preset subject matter, is to design an efficient junction between the strip line distribution network sub-assemblies and the coaxial cables driving the signals to the radiating elements of the antenna array.
  • the junction of coaxial cables to strip lines is realized by using metal plates on which the cable braid can be soldered directly for example be brass, copper.
  • metal plates on which the cable braid can be soldered directly for example be brass, copper.
  • the PIM performances are good, but the main problem regarding this solution is material cost. Huge brass or copper plates are necessary, and these materials are expensive (three times aluminum cost, and the trend is regular increase of these copper alloys cost).
  • junction of coaxial cables to strip lines is realized by using metal plates on which the cable cannot be soldered, for example aluminum.
  • metal plates on which the cable cannot be soldered for example aluminum.
  • Figure 1 presents an illustrative example of a device for the connection between a strip line 101, realized on a first part of a printed circuit board 102, and a coaxial cable 103.
  • the coaxial cable 103 includes an inner conductor 104 and an outer conductor 105.
  • the device comprises a cover top 106 and a cover bottom 107 respectively located over and under the printed circuit board.
  • a second part of the printed circuit board 102 is inductively coupled with the cover top 106 and the cover bottom 107.
  • the inner conductor 104 is electrically connected to the strip line 101 and the outer conductor 105 is inductively or electrically connected to the second part of the printed circuit board.
  • the best results are achieved by using a inductive connection.
  • the device of this illustrative example allows cheap material for the strip line ground plates with no solder on these plates. This illustrative example also avoids adding extra parts to reduce cost and PIM performances. This illustrative example reduces assembly time to improve production line capacity.
  • At least one of the insulating layers is constituted of a insulating varnish.
  • the second part is located around the strip line.
  • the figures 2-a to 2-d present an embodiment according to the invention.
  • a coaxial cable is connected to a strip line as.
  • the whole assembly comprises the coaxial cable, the strip line conductor, the top and bottom covers.
  • the strip line conductor is printed on a thin PCB board.
  • the top and bottom covers are made with bended plates of low cost material, for example aluminum.
  • the top cover is capacitively coupled trough the PCB top varnish layer to the PCB metal coupling area (top side).
  • This PCB metal coupling area is connected to the PCB bottom coupling area by PCB metalized via.
  • This PCB bottom coupling area is also capacitively coupled through a PCB varnish layer to the bottom cover.
  • the link to the coaxial cable is made by soldering the braid on the PCB top metal coupling area.
  • the inner conductor of the cable is soldered on the strip line conductor.
  • a window is shaped in the top cover in front of the cable to avoid random contact.
  • top and bottom covers and the printed circuit board are be maintained together by very low cost plastic rivets (not represented on the figures).
  • the contact pressure required is much less critical than direct contact for good PIM performances.
  • Another embodiment of the present subject matter is an antenna comprising one of the connection devices previously described.
  • At least one connection device is used to connect radiating elements and/or feeding networks and/or splitters and/or phase shifters and/or filters and/or active boards and/or any other RF devices implemented within the antenna.
  • connection device of the present subject matter can also be used for any kind of device requiring a coaxial cable to stripline connection, for example filters, amplifiers, etc..

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  • Details Of Aerials (AREA)

Claims (7)

  1. Dispositif de raccordement d'une ligne ruban à un câble coaxial, comprenant :
    une carte de circuit imprimé (102) comprenant une ligne ruban (101), une zone de couplage supérieure et une zone de couplage inférieure,
    un câble coaxial (103), comportant un conducteur interne (104) et un conducteur externe (105), le conducteur interne étant raccordé électriquement à la ligne ruban et le conducteur externe étant formé par une tresse brasée à la zone de couplage supérieure,
    un capot supérieur et un capot inférieur respectivement situés sur et sous la carte de circuit imprimé,
    le capot supérieur étant couplé de façon capacitive par une première couche isolante à la zone de couplage supérieure et le capot inférieur étant couplé de façon capacitive par une deuxième couche isolante à la zone de couplage inférieure, et le capot supérieur étant en contact avec la première couche isolante sur un côté de la carte de circuit imprimé et le capot inférieur étant en contact avec la deuxième couche isolante sur l'autre côté de la carte de circuit imprimé.
  2. Dispositif selon la revendication 1 dans lequel la zone de couplage supérieure est raccordée à la zone de couplage inférieure par des trous d'interconnexion métallisés.
  3. Dispositif selon une quelconque revendication précédente dans lequel les capots supérieur et inférieur et la carte de circuit imprimé sont maintenus ensemble par des rivets en plastique.
  4. Dispositif selon une quelconque revendication précédente dans lequel les capots supérieur et inférieur sont des plaques d'aluminium pliées.
  5. Antenne comprenant le dispositif de l'une quelconque des revendications précédentes.
  6. Antenne selon la revendication 5 comprenant en outre un ou plusieurs éléments parmi un filtre, un séparateur, un déphaseur, une carte active ou un dispositif RF.
  7. Procédé de raccordement d'une ligne ruban et d'un câble coaxial comprenant
    le positionnement d'un capot supérieur (106) et d'un capot inférieur (107) sur et sous une carte de circuit imprimé (102), respectivement, et la mise en place d'une partie plate du capot supérieur sur une couche isolante et la mise en place d'une partie plate du capot inférieur sur une couche isolante de ladite carte de circuit imprimé,
    le raccordement électrique d'un conducteur interne (104) du câble coaxial à la ligne ruban (101) sur une première partie de la carte de circuit imprimé,
    le brasage d'un conducteur externe (105) du câble coaxial formé par une tresse à une zone de couplage supérieure sur une deuxième partie de la carte de circuit imprimé,
    le maintien du capot supérieur, du capot inférieur et de la carte de circuit imprimé ensemble par des rivets en plastique.
EP16305603.9A 2016-05-24 2016-05-24 Dispositif pour la connexion entre une ligne ruban et un câble coaxial Active EP3249741B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16305603.9A EP3249741B1 (fr) 2016-05-24 2016-05-24 Dispositif pour la connexion entre une ligne ruban et un câble coaxial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16305603.9A EP3249741B1 (fr) 2016-05-24 2016-05-24 Dispositif pour la connexion entre une ligne ruban et un câble coaxial

Publications (2)

Publication Number Publication Date
EP3249741A1 EP3249741A1 (fr) 2017-11-29
EP3249741B1 true EP3249741B1 (fr) 2020-02-26

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Application Number Title Priority Date Filing Date
EP16305603.9A Active EP3249741B1 (fr) 2016-05-24 2016-05-24 Dispositif pour la connexion entre une ligne ruban et un câble coaxial

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EP (1) EP3249741B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108987867B (zh) * 2018-08-03 2021-03-09 中天宽带技术有限公司 一种超宽带同轴线-等效带状线平面过渡结构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8362856B2 (en) * 2009-11-17 2013-01-29 Raytheon Company RF transition with 3-dimensional molded RF structure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3587004A (en) * 1969-09-23 1971-06-22 Sylvania Electric Prod Contradirectional couplers
JP3976473B2 (ja) * 2000-05-09 2007-09-19 日本電気株式会社 高周波回路及びそれを用いたモジュール、通信機
FR2942569B1 (fr) * 2009-02-25 2011-03-25 Alcatel Lucent Dispositif de connexion pour un cable coaxial transportant un signal haute frequence.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8362856B2 (en) * 2009-11-17 2013-01-29 Raytheon Company RF transition with 3-dimensional molded RF structure

Also Published As

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EP3249741A1 (fr) 2017-11-29

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