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WO1998045904A1 - Grounded surface mounted mini coaxial connector - Google Patents

Grounded surface mounted mini coaxial connector Download PDF

Info

Publication number
WO1998045904A1
WO1998045904A1 PCT/US1997/018169 US9718169W WO9845904A1 WO 1998045904 A1 WO1998045904 A1 WO 1998045904A1 US 9718169 W US9718169 W US 9718169W WO 9845904 A1 WO9845904 A1 WO 9845904A1
Authority
WO
WIPO (PCT)
Prior art keywords
coaxial connector
contact
pcb
apertures
housing
Prior art date
Application number
PCT/US1997/018169
Other languages
French (fr)
Inventor
Bernardus L. F. Paagman
Petrus W. H. Schalk
Original Assignee
Berg Technology, Inc.
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 Berg Technology, Inc. filed Critical Berg Technology, Inc.
Publication of WO1998045904A1 publication Critical patent/WO1998045904A1/en

Links

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
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H01R24/50—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency mounted on a PCB [Printed Circuit Board]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/722—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures coupling devices mounted on the edge of the printed circuits
    • H01R12/724—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures coupling devices mounted on the edge of the printed circuits containing contact members forming a right angle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2103/00—Two poles

Definitions

  • the present invention relates to electrical connectors and more particularly to coaxial connectors.
  • the present invention comprise a coaxial connector for mounting to a printed circuit board (PCB) substrate.
  • This connector includes a housing of electrically insulating material having a contact side for mating with another connector and a connecting side for mounting on the PCB.
  • a plurality of electrical contact elements of electrically conductive material are disposed in the housing and extend from the contact side to the connecting side. Each contact element has a contact end portion disposed at said contact side and a connecting end portion extending from the connecting side.
  • a shielding means positioned outwardly adjacent the housing, and means are provided for fixing the shielding means to the PCB.
  • Fig. 1 is a vertical cross sectional view of a coaxial cable representing a preferred embodiment of the present invention:
  • Fig. 2 is a vertical cross sectional view of a coaxial connector representing a second preferred embodiment of the present invention
  • Fig. 3 is a vertical cross sectional view of a coaxial connector representing a third preferred embodiment of the present invention.
  • Fig. 4 is a vertical cross sectional view of a coaxial connector representing a fourth preferred embodiment of the present invention. Detailed Description of the Preferred Embodiments
  • the connector design aims at an overall impedance level of 50 ohms along the length of the connector. Simulations have shown that generally this is the case as one progresses along the length of connection with some "dips” and “rises” at specific cross-sections; however, once the signal and ground connections enter the PCB aperture, this uniformity generally does not continue . This fact is due to the approximately "tubular" ground holes surrounding the signal conductor. In a press-fit arrangement, there is greater proximity, thus increasing the mutual coupling and reducing the impedance value particularly at higher signal frequencies. It will be appreciated that this impedance dip is lower in a through-mount arrangement since the difference between hole diameter and tail width is smaller.
  • the effective board impedance increases to have a better match with the connecting length of the connection.
  • Advantage can be taken of this by allowing the ground connection to occur at the board surface as with an appropriately positioned spring or tab attached to the machined outer metal casing. Since the grounding is on a pad on the surface of board with air as interface thus higher impedance between the signal hole, the dip in impedance as with conventional press-fit connectors, can be avoided.
  • a grounded surface mounted coaxial connector housing is shown generally at numeral 10.
  • This connector has a signal conductor 12 having an outer insulation layer 14 and a section 15 for making electrical and mechanical contact with another signal conductor.
  • the connector also has a ground conductor 16 having an outer insulation layer 18 and a section 19 for making electrical and mechanical contact with another ground conductor.
  • the connector has a rear metal wall 20 and a metal spacer 22 between the ground conductor and the signal conductor insulation.
  • a surface mount (SMT) contact spring 24 mounts the connector on the printed circuit board (PCB) 26.
  • the center contact press fit tails 28 and 30 are mounted on the PCB 26.
  • FIG. 2 another housing grounded surface mounted coaxial connector is shown generally at numeral 32.
  • the connector includes a signal conductor 34 having an outer insulation layer 36.
  • This connector also includes a ground conductor 38 with an outer insulation layer 40.
  • a solder tab or toe 46 fixes the connector to a PCB 48. Center contact solder tails 50 and 52 engage the PCB.
  • grounded surface mounted coaxial connector housing is shown at numeral al 54.
  • This connector has a signal terminal 56 with an outer insulation layer 58. It also has a ground terminal 60 with an outer insulation layer 62.
  • An SMT contact spring 68 fixes the connector to a PCB 70.
  • the signal and ground contacts are connected to the PCB by means of press fit blind holes 72 and 74. Mounting a signal terminal and ground contacts in this way is described in greater detail in European Patent Application EP 0 692 841A1 published January 17, 1996, the contents of which are incorporated herein by reference.
  • FIG. 4 another grounded surface mounted coaxial connector housing is shown generally at numeral 76.
  • This connector has a signal terminal 78 with an outer insulation layer 80. It also has a ground contact 82 with an outer insulation layer 84. There is a rear metal wall 86 and a spacer 88 that separates the insulated signal and ground connectors. A solder tab or toe 90 fixes the connector to a PCB 92. The signal and ground conductors are fixed to the PCB by means of press fit blind holes 94 and 96.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

A coaxial connector (10) for mounting to a printed circuit board (PCB) substrate (26) which is adapted to having uniform impedance throughout its length. This connector includes a housing of electrically insulating material having a contact side for mating with another connector and a connecting side for mounting on the PCB (26). A plurality of electrical contact elements of (12, 16) electrically conductive material are disposed in the housing and extend from the contact side to the connecting side. Each contact element has a contact end portion (15, 19) disposed at said contact side and a connecting end portion (28, 30) extending from the connecting side. A conductive shield (20) is positioned outwardly adjacent the housing. This shield (20) is fixed to the PCB by means of a contact spring (24) or a solder tab.

Description

GROUNDED SURFACE MOUNTED MINI COAXIAL CONNECTOR
Background of the Invention
1. Field of the Invention: The present invention relates to electrical connectors and more particularly to coaxial connectors.
2. Brief Description of Prior Developments; In coaxial connectors it is often desirable that impedance be relatively uniform over the length of the connector. It is found, however, that when a coaxial connector is mounted on a printed circuit board (PCB), impedance will not necessarily be uniform with other points on the conductor length when the conductor enters the mounting apertures in the PCB. There is, therefor, a need for a means of providing uniform impedance in a coaxial connector at the point where the conductive terminals engage the PCB.
Summary of the Invention The present invention comprise a coaxial connector for mounting to a printed circuit board (PCB) substrate. This connector includes a housing of electrically insulating material having a contact side for mating with another connector and a connecting side for mounting on the PCB. A plurality of electrical contact elements of electrically conductive material are disposed in the housing and extend from the contact side to the connecting side. Each contact element has a contact end portion disposed at said contact side and a connecting end portion extending from the connecting side. A shielding means positioned outwardly adjacent the housing, and means are provided for fixing the shielding means to the PCB. Brief Description of the Drawings
The invention is further described with reference to the accompanying drawings in which:
Fig. 1 is a vertical cross sectional view of a coaxial cable representing a preferred embodiment of the present invention:
Fig. 2 is a vertical cross sectional view of a coaxial connector representing a second preferred embodiment of the present invention;
Fig. 3 is a vertical cross sectional view of a coaxial connector representing a third preferred embodiment of the present invention; and
Fig. 4 is a vertical cross sectional view of a coaxial connector representing a fourth preferred embodiment of the present invention. Detailed Description of the Preferred Embodiments
Essentially the connector design aims at an overall impedance level of 50 ohms along the length of the connector. Simulations have shown that generally this is the case as one progresses along the length of connection with some "dips" and "rises" at specific cross-sections; however, once the signal and ground connections enter the PCB aperture, this uniformity generally does not continue . This fact is due to the approximately "tubular" ground holes surrounding the signal conductor. In a press-fit arrangement, there is greater proximity, thus increasing the mutual coupling and reducing the impedance value particularly at higher signal frequencies. It will be appreciated that this impedance dip is lower in a through-mount arrangement since the difference between hole diameter and tail width is smaller. Should the tubular ground holes be removed in this structure, the effective board impedance increases to have a better match with the connecting length of the connection. Advantage can be taken of this by allowing the ground connection to occur at the board surface as with an appropriately positioned spring or tab attached to the machined outer metal casing. Since the grounding is on a pad on the surface of board with air as interface thus higher impedance between the signal hole, the dip in impedance as with conventional press-fit connectors, can be avoided.
Referring to Fig. 1 a grounded surface mounted coaxial connector housing is shown generally at numeral 10. This connector has a signal conductor 12 having an outer insulation layer 14 and a section 15 for making electrical and mechanical contact with another signal conductor. The connector also has a ground conductor 16 having an outer insulation layer 18 and a section 19 for making electrical and mechanical contact with another ground conductor. The connector has a rear metal wall 20 and a metal spacer 22 between the ground conductor and the signal conductor insulation. A surface mount (SMT) contact spring 24 mounts the connector on the printed circuit board (PCB) 26. The center contact press fit tails 28 and 30 are mounted on the PCB 26. Further useful detail concerning the construction of coaxial connectors may be included in U.S. Patents No. 5, 169,343 and 5,516,294, the contents of which are included herein by reference.
Referring to Fig. 2, another housing grounded surface mounted coaxial connector is shown generally at numeral 32. The connector includes a signal conductor 34 having an outer insulation layer 36. This connector also includes a ground conductor 38 with an outer insulation layer 40. There is also a rear metal wall 42 and a spacer 44 between the insulated signal and ground conductors. A solder tab or toe 46 fixes the connector to a PCB 48. Center contact solder tails 50 and 52 engage the PCB.
Referring to Fig. 3, grounded surface mounted coaxial connector housing is shown at numeral al 54. This connector has a signal terminal 56 with an outer insulation layer 58. It also has a ground terminal 60 with an outer insulation layer 62. There is a rear metal wall 64 and a spacer 66 between the insulated ground and signal conductors. An SMT contact spring 68 fixes the connector to a PCB 70. The signal and ground contacts are connected to the PCB by means of press fit blind holes 72 and 74. Mounting a signal terminal and ground contacts in this way is described in greater detail in European Patent Application EP 0 692 841A1 published January 17, 1996, the contents of which are incorporated herein by reference. Referring to Fig. 4, another grounded surface mounted coaxial connector housing is shown generally at numeral 76. This connector has a signal terminal 78 with an outer insulation layer 80. It also has a ground contact 82 with an outer insulation layer 84. There is a rear metal wall 86 and a spacer 88 that separates the insulated signal and ground connectors. A solder tab or toe 90 fixes the connector to a PCB 92. The signal and ground conductors are fixed to the PCB by means of press fit blind holes 94 and 96.
It will be appreciated that a coaxial connector has been described which allows for relatively uniform impedance over the length of the connector.
While the present invention has been described in connection with the preferred embodiments of the various figures, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiment for performing the same function of the present invention without deviating therefrom. Therefore, the present invention should not be limited to any single embodiment, but rather construed in breadth and scope in accordance with the recitation of the appended claims.

Claims

Claims WHAT IS CLAIMED IS:
1. A coaxial connector for mounting to a printed circuit board (PCB) substrate comprising: (a) a housing of electrically insulating material having a contact side for mating with another connector and a connecting side for mounting on said circuit substrate;
(b) a plurality of electrical contact elements of electrically conductive material disposed in said housing and extending from the contact side to the connecting side, each contact element having a contact end portion disposed at said contact side and a connecting end portion extending from said connecting side;
(c) shielding means positioned outwardly adjacent the housing; and
(d) means for fixing the shielding means to the PCB.
2. The coaxial connector of claim 1 wherein at least one of the electrical contact elements is a signal conductor.
3. The coaxial connector of claim 1 wherein at least one of the electrical contact elements is a ground conductor.
4. The coaxial connector of claim 1 wherein the shielding means is fixed to the PCB by a contact spring.
5. The coaxial connector of claim 1 wherein the shielding means is fixed to the PCB by a solder means.
6. The coaxial connector of claim 1 wherein the contacts engage the PCB.
7. The coaxial connector of claim 1 wherein contacts are inserted in apertures in the PCB.
8. The coaxial connector of claim 7 wherein the contacts are spaced from the apertures.
9. The coaxial connector of claim 8 wherein the apertures are through - mount apertures.
10. The coaxial connector of claim 8 wherein the apertures are blind holes.
11. A coaxial connector for mounting on a printed circuit board (PCB) substrate comprising:
(a) at least one signal terminal;
(b) a ground contact adjacent said at least one signal terminal;
(c) means for allowing said signal terminal to electrically and mechanically contact another signal terminal and means for allowing said ground contact to electrically and mechanically contact another ground contact;
(d) housing means at least partially surrounding the signal contact and ground contact; and
(e) means for fixing the housing means to the PCB.
12. The coaxial connector of claim 11 wherein there are a plurality of signal terminals.
13. The coaxial connector of claim 11 wherein there are a plurality of ground contacts.
14. The coaxial connector of claim 11 wherein the housing means is fixed to the PCB by a contact spring.
15. The coaxial connector of claim 11 wherein the means is fixed to the PCB by a solder means.
16. The coaxial connector of claim 11 wherein the signal terminal and the ground contact engage the PCB.
17. The coaxial connector of claim 11 wherein signal terminal and ground contact are inserted in apertures in the PCB.
18. The coaxial connector of claim 17 wherein the signal terminal and ground contact are spaced from the apertures.
19. The coaxial connector of claim 18 wherein the apertures are through-mount apertures.
20. The coaxial connector of claim 18 wherein the apertures are blind holes.
PCT/US1997/018169 1997-04-07 1997-10-08 Grounded surface mounted mini coaxial connector WO1998045904A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US83844697A 1997-04-07 1997-04-07
US08/838,446 1997-04-07

Publications (1)

Publication Number Publication Date
WO1998045904A1 true WO1998045904A1 (en) 1998-10-15

Family

ID=25277100

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/018169 WO1998045904A1 (en) 1997-04-07 1997-10-08 Grounded surface mounted mini coaxial connector

Country Status (1)

Country Link
WO (1) WO1998045904A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787853A (en) * 1986-03-29 1988-11-29 Kabushiki Kaisha Toshiba Printed circuit board with through-hole connection
US5169343A (en) * 1990-11-29 1992-12-08 E. I. Du Pont De Nemours And Company Coax connector module
US5344340A (en) * 1991-12-18 1994-09-06 Radiall Coaxial connector for connecting two printed-circuit boards
US5433617A (en) * 1993-06-04 1995-07-18 Framatome Connectors International Connector assembly for printed circuit boards

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787853A (en) * 1986-03-29 1988-11-29 Kabushiki Kaisha Toshiba Printed circuit board with through-hole connection
US5169343A (en) * 1990-11-29 1992-12-08 E. I. Du Pont De Nemours And Company Coax connector module
US5344340A (en) * 1991-12-18 1994-09-06 Radiall Coaxial connector for connecting two printed-circuit boards
US5433617A (en) * 1993-06-04 1995-07-18 Framatome Connectors International Connector assembly for printed circuit boards

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