EP3425728A1 - Connector assembly - Google Patents

Connector assembly Download PDF

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Publication number
EP3425728A1
EP3425728A1 EP17180314.1A EP17180314A EP3425728A1 EP 3425728 A1 EP3425728 A1 EP 3425728A1 EP 17180314 A EP17180314 A EP 17180314A EP 3425728 A1 EP3425728 A1 EP 3425728A1
Authority
EP
European Patent Office
Prior art keywords
attachment portion
adaptor
antenna
antenna element
connector assembly
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.)
Granted
Application number
EP17180314.1A
Other languages
German (de)
French (fr)
Other versions
EP3425728B1 (en
Inventor
Tomas Rutfors
Tommy Kärrman
Stefan Westin
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.)
ProAnt AB
Original Assignee
ProAnt AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ProAnt AB filed Critical ProAnt AB
Priority to EP17180314.1A priority Critical patent/EP3425728B1/en
Publication of EP3425728A1 publication Critical patent/EP3425728A1/en
Application granted granted Critical
Publication of EP3425728B1 publication Critical patent/EP3425728B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas

Definitions

  • the invention concerns a connector assembly for connecting an antenna element to an antenna signal transmission line. Further, it also concerns an antenna assembly and a machine or device comprising such an antenna assembly.
  • the antenna has to connect to the radio electronics circuits of the device with a suitable impedance and, further, the completed device must not emit unwanted radio signals, but just signals in the desired spectrum.
  • fig. 1 depicts a common solution of such a connector assembly wherein a helix antenna element 2 is connected to radio electronics circuits on a printed circuit board (PCB) 18 inside of a device (the device itself, other than the board 18, is not shown in Fig. 1 ).
  • PCB printed circuit board
  • the connector assembly 1 comprises another printed circuit board 4, acting as an adaptor 4, and a shielding metal cage 12.
  • the cage 12 comprises sheet metal that is folded to create a cage that can cover the radio electronics circuits on the board 18. Normally, the cage would be fitted onto the board 18 and connect to the signal ground of that board 18. In Fig. 1 , the cage 12 is seen from above and therefore the folds along the edges are hidden. Also, the radio electronics circuits are also not shown, since they are positioned below the cage 12 in Fig. 1 .
  • the antenna element 2 is connected to the adaptor board 4 at an antenna element attachment portion 5 (for instance by soldering).
  • a transmission line 3 is connected to the adaptor board 4. This connection is by way of an antenna signal conductor 7 of the transmission line 3 that is connected to a signal attachment portion 6 of the adaptor board 4 (by soldering or any other suitable means).
  • a ground conductor 9 of the transmission line 3 (for instance a shield of a coaxial cable) is connected to the adaptor board 4 via a ground attachment portion 8 (for instance by soldering also).
  • the antenna element attachment portion 5 is in electrical connection with the signal attachment portion 6, such that the antenna element 2 is in connection with the signal conductor 7 of the transmission line 3.
  • the adaptor board 4 comprises an impedance matching part 10 that is adapted to match the impedance of the antenna element 2 to the antenna transmission line 3.
  • this impedance matching is shown schematically as surface mounted capacitances and coils 10 connected between the signal conductor 7 (in connection with the helix antenna element 2) and ground 8 on the adaptor board 4.
  • ground could for instance be the whole surface of the adaptor board 4, including the ground attachment portion 8, except the parts where the antenna signals travel (items 5, 6 and 7).
  • the adaptor 4 is physically connected to the metal cage 12, via clips 17, and the metal cage 12 is electrically connected to the ground attachment portion 8 of the adaptor 4 (also via the clips 17).
  • the cage 12 also provides an attachment point for the adaptor board 4 combined with the electrical connection between them.
  • the prior art of Fig. 1 proposes the clips 17 as a simple means to electrically connect the cage 12 with the adaptor board 4.
  • the clips 17 are soldered to the board 4 and clips mechanically onto the cage 12, thus any soldering on the cage is avoided while at the same time, the cage 12 provides some lateral stability to the adaptor board 4 such that possibly some attachment points for the board 4 can be avoided. In this way, the cost of the connector assembly of the prior art in Fig. 1 can be lowered.
  • a main object is consequently to propose an improved connector assembly which is more cost effective while retaining all antenna properties.
  • This connector assembly overcomes the above problems by getting rid of the printed circuit board, the clips and the impedance matching components all together. Instead, the cage is extended with a part corresponding to the adaptor board, making effectively the cage and adaptor board an integral, one-piece part.
  • the transmission line with the signal and ground conductors are connected (e.g. by soldering) to this integral part together with the antenna element.
  • This may seem like a short-circuit of the antenna transmission line and the antenna element.
  • a slit is introduced in between where the signal conductor and the ground conductor is connected to the integral part. This provides enough separation to avoid a short-circuit and further provides the impedance matching of the antenna element.
  • a connector assembly 1 for connecting an antenna element 2 to an antenna transmission line 3, according to the invention is shown.
  • the connector assembly 1 comprises an adaptor 4 which comprises:
  • the connector assembly 1 further comprises a shielding metal cage 12 for shielding radio circuits in three spatial dimensions.
  • the adaptor 4 is physically connected to the metal cage 12 and the metal cage 12 is electrically connected to the ground attachment portion 8 of the adaptor 4.
  • the idea of the invention is that the adaptor 4 and the metal cage 12 form an integral part 13 with a continuous metallic surface constituting both the metal cage 12 and a surface on the adaptor 4 onto which the antenna element attachment portion 5, the signal attachment portion 6 and the ground attachment portion 8 are formed.
  • the impedance matching part 10 comprises a slit 14 in a portion of the continuous metallic surface with the signal attachment portion 6 positioned on one side 15 of the slit 14 and the ground attachment portion 8 positioned on another side 16 of the slit 14. In this way, the impedance matching is effected without the use of lump components and also production and mounting steps are only required for one part instead of two parts of the prior art.
  • the slit 14 should be long enough to provide enough spacing between signal and ground, see Fig. 2 . Obviously, the slit 14 cannot cut through the whole of the integral part from one side to another, since then it would no longer be an integral one-piece part.
  • the integral part 13 is made of a printed circuit board with the continuous metallic surface being a metal layer of the printed circuit board and the three dimensional aspect of the metal cage 12 arises from metallic pins (not shown in Fig. 2 ) attached electrically conducting to the metal layer at distances from each other to shield radio waves.
  • the slit 14 in the metal layer could for instance be attained by ordinary etching of the printed circuit board.
  • the integral part 13 is made of a sheet metal and the three dimensional aspect of the metal cage 12 arising from at least one fold in at least a part the sheet metal. This may prove even more economical, since sheet metal is generally less expensive compared to a printed circuit board and no etching is required.
  • the slit 14 could for instance be accomplished in the same working steps as when otherwise shaping the integral part 13 from a sheet metal.
  • the invention further comprises an antenna assembly comprising an antenna element 2, an antenna transmission line 3 having a signal conductor 7 and a ground conductor 9, and a connector assembly 1 according to any of the previous embodiments of the invention.
  • the antenna element 2 is connected to the antenna element attachment portion 5 of the adaptor 4 and the antenna signal conductor 7 is connected to the signal attachment portion 6 of the adaptor 4 to form a complete antenna assembly to be built in to a device of some kind.
  • the invention further comprises a machine or device comprising an antenna assembly according to the invention.
  • Reference Signs List 1. connector assembly 12. Shielding metal cage 2. Antenna element 13. Integral part 3. Transmission line 14. Slit 4. Adaptor 15. One side of slit (14) 5. Antenna element attachment portion 16. Other side of slit (14) 6. Signal attachment portion 17. Clips 7. Antenna signal conductor 18. Radio electronics board 8. Ground attachment portion 19. Connector to radio electronics board 9. A ground conductor 10. Impedance matching part

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)

Abstract

The invention concerns a connector assembly (1) for connecting an antenna element (2) to an antenna signal transmission line (3). The connector assembly (1) comprises an adaptor (4) comprising an antenna element attachment portion (5), a signal attachment portion (6), a ground attachment portion (8) and an impedance matching part (10). The connector assembly (1) further comprising a shielding metal cage physically connected to the adaptor (4), wherein the adaptor (4) and the metal cage (12) form an integral part and the impedance matching part (10) comprises a slit (14) in a portion of the integral part with the signal attachment portion (6) positioned on one side (15) of the slit (14) and the ground attachment portion (8) positioned on another side (16) of the slit (14). The invention also concerns an antenna assembly and a machine or device comprising such an antenna assembly.

Description

    Field of the invention
  • The invention concerns a connector assembly for connecting an antenna element to an antenna signal transmission line. Further, it also concerns an antenna assembly and a machine or device comprising such an antenna assembly.
    • Background art Introduction
  • In many real world devices with internal antennas, there has to be multiple integration efforts of the antenna in order for the device to comply with all electro-magnetic requisites. The antenna has to connect to the radio electronics circuits of the device with a suitable impedance and, further, the completed device must not emit unwanted radio signals, but just signals in the desired spectrum.
  • To this end, both an impedance match must be affected and also some shielding of the radio electronics circuits of the device that may otherwise emit unwanted radio signals themselves. For instance, the prior art of fig. 1 depicts a common solution of such a connector assembly wherein a helix antenna element 2 is connected to radio electronics circuits on a printed circuit board (PCB) 18 inside of a device (the device itself, other than the board 18, is not shown in Fig. 1).
  • The connector assembly 1 comprises another printed circuit board 4, acting as an adaptor 4, and a shielding metal cage 12. The cage 12 comprises sheet metal that is folded to create a cage that can cover the radio electronics circuits on the board 18. Normally, the cage would be fitted onto the board 18 and connect to the signal ground of that board 18. In Fig. 1, the cage 12 is seen from above and therefore the folds along the edges are hidden. Also, the radio electronics circuits are also not shown, since they are positioned below the cage 12 in Fig. 1.
  • The antenna element 2 is connected to the adaptor board 4 at an antenna element attachment portion 5 (for instance by soldering).
  • Further, a transmission line 3 is connected to the adaptor board 4. This connection is by way of an antenna signal conductor 7 of the transmission line 3 that is connected to a signal attachment portion 6 of the adaptor board 4 (by soldering or any other suitable means). A ground conductor 9 of the transmission line 3 (for instance a shield of a coaxial cable) is connected to the adaptor board 4 via a ground attachment portion 8 (for instance by soldering also).
  • On the adaptor board 4, the antenna element attachment portion 5 is in electrical connection with the signal attachment portion 6, such that the antenna element 2 is in connection with the signal conductor 7 of the transmission line 3.
  • Further, the adaptor board 4 comprises an impedance matching part 10 that is adapted to match the impedance of the antenna element 2 to the antenna transmission line 3. In Fig. 1, this impedance matching is shown schematically as surface mounted capacitances and coils 10 connected between the signal conductor 7 (in connection with the helix antenna element 2) and ground 8 on the adaptor board 4. In Fig. 1, ground could for instance be the whole surface of the adaptor board 4, including the ground attachment portion 8, except the parts where the antenna signals travel ( items 5, 6 and 7).
  • Further, the adaptor 4 is physically connected to the metal cage 12, via clips 17, and the metal cage 12 is electrically connected to the ground attachment portion 8 of the adaptor 4 (also via the clips 17). In this way the cage 12 also provides an attachment point for the adaptor board 4 combined with the electrical connection between them.
    • Problems with prior art solution
  • In the antenna industry, there is always an urge to lower costs if possible and also to facilitate an easier mounting of components. In order to address this problem in view of a general integration attempt of an antenna into a device with respect to the impedance of the antenna and shielding of unwanted radio signals, the prior art of Fig. 1 for instance proposes the clips 17 as a simple means to electrically connect the cage 12 with the adaptor board 4. The clips 17 are soldered to the board 4 and clips mechanically onto the cage 12, thus any soldering on the cage is avoided while at the same time, the cage 12 provides some lateral stability to the adaptor board 4 such that possibly some attachment points for the board 4 can be avoided. In this way, the cost of the connector assembly of the prior art in Fig. 1 can be lowered.
  • However, the problem with the prior art design of Fig. 1 posed in this application is to reduce the cost even more while maintaining all antenna properties of the prior art design.
    • Summary of the Invention Technical problem
  • It is an object of the present invention to propose a solution for or a reduction of the problems of prior art.
  • A main object is consequently to propose an improved connector assembly which is more cost effective while retaining all antenna properties.
    • Solution to Problem
  • According to the invention, this is accomplished by a connector assembly according to claim 1.
  • This connector assembly overcomes the above problems by getting rid of the printed circuit board, the clips and the impedance matching components all together. Instead, the cage is extended with a part corresponding to the adaptor board, making effectively the cage and adaptor board an integral, one-piece part.
  • Further, the transmission line with the signal and ground conductors are connected (e.g. by soldering) to this integral part together with the antenna element. This may seem like a short-circuit of the antenna transmission line and the antenna element. However, a slit is introduced in between where the signal conductor and the ground conductor is connected to the integral part. This provides enough separation to avoid a short-circuit and further provides the impedance matching of the antenna element.
  • Thus, a much simpler connector assembly is facilitated that is cheaper to produce.
  • The dependent claims disclose further advantageous aspects of the invention.
    • Brief Description of Drawings
  • Embodiments exemplifying the invention will now be described, by means of the appended drawings, on which:
    • Fig. 1 illustrates a connector assembly according to the prior art, and
    • Fig. 2 illustrates a connector assembly according to the invention.
    Detailed description
  • In Fig. 2, a connector assembly 1 for connecting an antenna element 2 to an antenna transmission line 3, according to the invention is shown.
  • The connector assembly 1 comprises an adaptor 4 which comprises:
    • an antenna element attachment portion 5, for connection of the antenna element 2 to the adaptor 4,
    • a signal attachment portion 6, for connection of a signal conductor 7 of the transmission line 3 to the adaptor 4, wherein the antenna element attachment portion (5) is in electrical connection with the signal attachment portion 6,
    • a ground attachment portion 8, for connection of a ground conductor 9 of the transmission line 3 to the adaptor 4,
    • an impedance matching part 10, adapted to match the impedance of the antenna element 2 to the antenna transmission line 3.
  • The connector assembly 1 further comprises a shielding metal cage 12 for shielding radio circuits in three spatial dimensions. The adaptor 4 is physically connected to the metal cage 12 and the metal cage 12 is electrically connected to the ground attachment portion 8 of the adaptor 4.
  • The idea of the invention is that the adaptor 4 and the metal cage 12 form an integral part 13 with a continuous metallic surface constituting both the metal cage 12 and a surface on the adaptor 4 onto which the antenna element attachment portion 5, the signal attachment portion 6 and the ground attachment portion 8 are formed. The impedance matching part 10 comprises a slit 14 in a portion of the continuous metallic surface with the signal attachment portion 6 positioned on one side 15 of the slit 14 and the ground attachment portion 8 positioned on another side 16 of the slit 14. In this way, the impedance matching is effected without the use of lump components and also production and mounting steps are only required for one part instead of two parts of the prior art.
  • Generally, the slit 14 should be long enough to provide enough spacing between signal and ground, see Fig. 2. Obviously, the slit 14 cannot cut through the whole of the integral part from one side to another, since then it would no longer be an integral one-piece part.
  • In one embodiment of the connector assembly 1 according to the invention, the integral part 13 is made of a printed circuit board with the continuous metallic surface being a metal layer of the printed circuit board and the three dimensional aspect of the metal cage 12 arises from metallic pins (not shown in Fig. 2) attached electrically conducting to the metal layer at distances from each other to shield radio waves. The slit 14 in the metal layer could for instance be attained by ordinary etching of the printed circuit board.
  • In another embodiment of the connector assembly 1 according to the invention, and as an alternative to the previous embodiment, the integral part 13 is made of a sheet metal and the three dimensional aspect of the metal cage 12 arising from at least one fold in at least a part the sheet metal. This may prove even more economical, since sheet metal is generally less expensive compared to a printed circuit board and no etching is required. The slit 14 could for instance be accomplished in the same working steps as when otherwise shaping the integral part 13 from a sheet metal.
  • The invention further comprises an antenna assembly comprising an antenna element 2, an antenna transmission line 3 having a signal conductor 7 and a ground conductor 9, and a connector assembly 1 according to any of the previous embodiments of the invention. The antenna element 2 is connected to the antenna element attachment portion 5 of the adaptor 4 and the antenna signal conductor 7 is connected to the signal attachment portion 6 of the adaptor 4 to form a complete antenna assembly to be built in to a device of some kind.
  • The invention further comprises a machine or device comprising an antenna assembly according to the invention. Reference Signs List
    1. connector assembly 12. Shielding metal cage
    2. Antenna element 13. Integral part
    3. Transmission line 14. Slit
    4. Adaptor 15. One side of slit (14)
    5. Antenna element attachment portion 16. Other side of slit (14)
    6. Signal attachment portion 17. Clips
    7. Antenna signal conductor 18. Radio electronics board
    8. Ground attachment portion 19. Connector to radio electronics board
    9. A ground conductor
    10. Impedance matching part

Claims (5)

  1. A connector assembly (1) for connecting an antenna element (2) to an antenna transmission line (3), the connector assembly (1) comprising:
    - an adaptor (4) comprising:
    - an antenna element attachment portion (5), for connection of the antenna element (2) to the adaptor (4),
    - a signal attachment portion (6), for connection of a signal conductor (7) of the transmission line (3) to the adaptor (4), wherein the antenna element attachment portion (5) is in electrical connection with the signal attachment portion (6),
    - a ground attachment portion (8), for connection of a ground conductor (9) of the transmission line (3) to the adaptor (4),
    - an impedance matching part (10), adapted to match the impedance of the antenna element (2) to the antenna transmission line (3),
    the connector assembly (1) further comprising:
    - a shielding metal cage (12) for shielding radio circuits in three spatial dimensions,
    wherein the adaptor (4) is physically connected to the metal cage (12) and the metal cage (12) is electrically connected to the ground attachment portion (8) of the adaptor (4),
    characterised in that:
    the adaptor (4) and the metal cage (12) form an integral part (13) with a continuous metallic surface constituting both the metal cage (12) and a surface on the adaptor (4) onto which the antenna element attachment portion (5), the signal attachment portion (6) and the ground attachment portion (8) are formed, wherein the impedance matching part (10) comprises a slit (14) in a portion of the continuous metallic surface with the signal attachment portion (6) positioned on one side (15) of the slit (14) and the ground attachment portion (8) positioned on another side (16) of the slit (14).
  2. Connector assembly (1) according to claim 1, wherein the integral part (13) is made of a printed circuit board with the continuous metallic surface being a metal layer of the printed circuit board and the three dimensional aspect of the metal cage (12) arising from metallic pins attached electrically conducting to the metal layer at distances from each other to shield radio waves.
  3. Connector assembly (1) according to claim 1, wherein the integral part (13) is made of a sheet metal and the three dimensional aspect of the metal cage (12) arising from at least one fold in at least a part the sheet metal.
  4. Antenna assembly comprising:
    - an antenna element (2),
    - an antenna transmission line (3) having a signal conductor (7) and a ground conductor (9),
    - a connector assembly (1) according to any of claims 1 - 3,
    wherein the antenna element (2) is connected to the antenna element attachment portion (5) of the adaptor (4) and the antenna signal conductor (7) is connected to the signal attachment portion (6) of the adaptor (4).
  5. Machine or device comprising an antenna assembly according to claim 4.
EP17180314.1A 2017-07-07 2017-07-07 Connector assembly Active EP3425728B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17180314.1A EP3425728B1 (en) 2017-07-07 2017-07-07 Connector assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17180314.1A EP3425728B1 (en) 2017-07-07 2017-07-07 Connector assembly

Publications (2)

Publication Number Publication Date
EP3425728A1 true EP3425728A1 (en) 2019-01-09
EP3425728B1 EP3425728B1 (en) 2020-04-01

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ID=59298389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17180314.1A Active EP3425728B1 (en) 2017-07-07 2017-07-07 Connector assembly

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900006665A1 (en) 2019-05-09 2020-11-09 Bitron Spa CONNECTOR ASSEMBLY FOR REMOTE METERING DEVICES AND RELATED REMOTE METERING DEVICE.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6633262B1 (en) * 2000-06-01 2003-10-14 Mitsubishi Denki Kabushiki Kaisha Portable wireless terminal
US6636725B1 (en) * 1999-10-13 2003-10-21 Sony Corporation Antenna equipment and communication terminal equipment
US20040252064A1 (en) * 2003-06-10 2004-12-16 Alps Electric Co., Ltd. Small-sized and high-gained antenna-integrated module
US20110170231A1 (en) * 2010-01-14 2011-07-14 Qualcomm Incorporated Passive Coupler Between Package Substrate and System Board

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6636725B1 (en) * 1999-10-13 2003-10-21 Sony Corporation Antenna equipment and communication terminal equipment
US6633262B1 (en) * 2000-06-01 2003-10-14 Mitsubishi Denki Kabushiki Kaisha Portable wireless terminal
US20040252064A1 (en) * 2003-06-10 2004-12-16 Alps Electric Co., Ltd. Small-sized and high-gained antenna-integrated module
US20110170231A1 (en) * 2010-01-14 2011-07-14 Qualcomm Incorporated Passive Coupler Between Package Substrate and System Board

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900006665A1 (en) 2019-05-09 2020-11-09 Bitron Spa CONNECTOR ASSEMBLY FOR REMOTE METERING DEVICES AND RELATED REMOTE METERING DEVICE.
WO2020225741A1 (en) * 2019-05-09 2020-11-12 Bitron S.P.A Connector assembly for telemetering devices and related telemetering device

Also Published As

Publication number Publication date
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