EP0777918A1 - Microwave signal switch - Google Patents
Microwave signal switchInfo
- Publication number
- EP0777918A1 EP0777918A1 EP96910994A EP96910994A EP0777918A1 EP 0777918 A1 EP0777918 A1 EP 0777918A1 EP 96910994 A EP96910994 A EP 96910994A EP 96910994 A EP96910994 A EP 96910994A EP 0777918 A1 EP0777918 A1 EP 0777918A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrically conductive
- contact
- conductive part
- lines
- pads
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/10—Auxiliary devices for switching or interrupting
- H01P1/12—Auxiliary devices for switching or interrupting by mechanical chopper
Definitions
- the present invention relates to a switch for microwave signals.
- switches which include, inside a metal cavity, two electrically conductive pads, each having a contact face, and an electrically conductive part movable between a closed position in which it bears on the faces. contact pads and connects them electrically and an open position in which it is set back from said contact faces.
- These switches are used to constitute electrical relays for microwave signals, for which they suitably perform their closing and opening function of the microwave circuit, even under difficult operating conditions, for example in an environment polluted by impurities.
- the microwave signal is transmitted, at least by capacitive coupling, between the contact faces of the pads and the electrically conductive piece.
- the present invention aims to provide a switch for microwave signals which solves the problems mentioned above and in particular has very high reliability, whatever the operating conditions to which it is subjected.
- the subject of the present invention is a switch for microwave signals comprising, inside a metal cavity, an electrically conductive part and two electrically conductive studs each comprising a contact face with a facing surface of said part, said electrically conductive part. being movable between a closed position in which • it bears on the contact faces of the two studs and connects them electrically and an open position in which it is set back from said contact faces, characterized in that the at least one of the contact faces and / or the surface of said electrically conductive part are provided with protuberances comprising, in at least one section plane perpendicular to the contact face, a section of acute shape, having an apex angle less than 110 ° and a radius of curvature less than 0.05 mm.
- the device according to the invention makes it possible, by reducing the bearing surface between the electrically conductive part and the contact faces of the pads, to increase the contact pressure.
- the sharp edge of the protrusions breaks any films of impurities which may have deposited on the electrically conductive part or at the top of the protuberances.
- the grooves which separate two adjacent protuberances from the contact face of the studs make it possible to remove the impurities broken by the tops of the protuberances.
- protrusions on the contact faces of the pads comes from the fact that said protrusions are as many contact zones between the pads and the electrically conductive part, which makes it possible to limit the risks of false contacts.
- the protrusions extend along parallel lines of constant section. According to a first variant, these lines are rectilinear.
- these lines are circular and concentric.
- these lines are in a spiral.
- the contact face of the studs may include a peripheral crown on which the circular or spiral lines extend while a recess is provided in the central part delimited by said crown of the contact face of the stud.
- the invention applies equally well to switches in which the contact face of the studs is provided with protuberances, while the surface of the electrically conductive part facing the contact faces of the studs is smooth or provided with protuberances having the characteristics geometric defined above, only to switches in which the contact face of the pads is smooth while the surface of the electrically conductive part facing the contact faces of the pads is provided with said protuberances.
- FIG. 1 is a sectional view of a switch according to an embodiment of the invention
- FIG. 2 is a perspective view of a pad of the switch in FIG. 1,
- FIG. 3 is a sectional view along III-III of FIG. 2
- FIG. 4 is a close-up view of the protuberances of the pad of FIG. 3,
- FIG. 5 is a detailed view of part 5 of FIG. 4,
- FIGS. 6 to 9 are top views of studs comprising protuberances of different types.
- FIG. 10 is a perspective view of an electrically conductive part of a switch according to FIG. 1.
- the switch of FIG. 1 comprises, inside an electrically conductive box 1 connected to ground, two electrically conductive studs 2, each connected to a terminal of an electrical circuit, and an elongated piece 3 electrically conductive, here in the form of a metal blade carried by a piston 4, axially movable as indicated by the double arrow.
- the metal blade 3 Due to the movements of the piston 4, the metal blade 3 is capable of assuming a closed position, shown in the drawing, in which it bears on the end faces 5 of the pads 2, called contact faces in the sense of l invention, and an open position in which it is set back from the studs 2, preferably bearing against the wall of the housing 1 so as not to be able to play the role of an antenna which would transmit electrical signals d 'one pad to another by radiation.
- the pads 2 of the switch of Figure 1 are circular and have protrusions 6 on their upper face 5 as visible in Figure 2. These protrusions 6 are distributed on a peripheral ring 7 of the contact face 5 of the pad, a recess 8 being formed inside this ring 7 in the central part of the contact face of the stud.
- the protrusions 6 extend along lines of constant section, these lines being circular and concentric. According to the invention, the protrusions 6 have, in an axial section plane of the stud, an acute section clearly visible in FIG. 4.
- the radius of curvature r is equal to 0.01 mm and the apex angle is equal to 75 °.
- the protuberance lines extend radially with respect to the stud.
- the protuberances result from a crossing of rectilinear protruding lines extending in two constant directions perpendicular to each other.
- the protrusions 6, which have been described on the contact face 5 of each pad, can also be provided on the surface 9 of the electrically conductive part 3 opposite the contact faces 5 of the pads, as shown in Figure 10 where we see that the end of the contact piece 3 is of triangular shape.
- the geometry of the protrusions 6 must then have the same geometric characteristics as those defined above for the protrusions provided on the contact face of the pads.
- the contact face of the pads can be smooth or also include protuberances.
Landscapes
- Contacts (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9503613 | 1995-03-28 | ||
FR9503613A FR2732508B1 (en) | 1995-03-28 | 1995-03-28 | SWITCH FOR MICROWAVE SIGNALS |
PCT/FR1996/000471 WO1996030961A1 (en) | 1995-03-28 | 1996-03-28 | Microwave signal switch |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0777918A1 true EP0777918A1 (en) | 1997-06-11 |
EP0777918B1 EP0777918B1 (en) | 2000-12-27 |
Family
ID=9477486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96910994A Expired - Lifetime EP0777918B1 (en) | 1995-03-28 | 1996-03-28 | Microwave signal switch |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0777918B1 (en) |
CA (1) | CA2191253A1 (en) |
DE (1) | DE69611345T2 (en) |
FR (1) | FR2732508B1 (en) |
WO (1) | WO1996030961A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6856212B2 (en) * | 2002-12-16 | 2005-02-15 | Com Dev Ltd. | Incomplete mechanical contacts for microwave switches |
EP1840917B1 (en) * | 2006-03-27 | 2013-09-25 | Abb Ab | A contactor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB579365A (en) * | 1941-06-06 | 1946-08-01 | Standard Telephones Cables Ltd | Improvements in or relating to electrical contact arrangements particularly for use with high frequencies |
FR1170621A (en) * | 1957-04-04 | 1959-01-16 | Kienzle Uhrenfabriken Ag | Electrical contact device |
DE1539783A1 (en) * | 1966-06-21 | 1969-07-24 | Conradty Fa C | Arrangement to improve the contact with static or moving electrical carbon, graphite and metal contacts |
JPH0575302A (en) * | 1991-09-12 | 1993-03-26 | Nec Corp | Coaxial changeover device |
-
1995
- 1995-03-28 FR FR9503613A patent/FR2732508B1/en not_active Expired - Fee Related
-
1996
- 1996-03-28 EP EP96910994A patent/EP0777918B1/en not_active Expired - Lifetime
- 1996-03-28 DE DE69611345T patent/DE69611345T2/en not_active Expired - Lifetime
- 1996-03-28 CA CA 2191253 patent/CA2191253A1/en not_active Abandoned
- 1996-03-28 WO PCT/FR1996/000471 patent/WO1996030961A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9630961A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2732508B1 (en) | 1997-05-09 |
WO1996030961A1 (en) | 1996-10-03 |
DE69611345D1 (en) | 2001-02-01 |
CA2191253A1 (en) | 1996-10-03 |
DE69611345T2 (en) | 2001-07-19 |
EP0777918B1 (en) | 2000-12-27 |
FR2732508A1 (en) | 1996-10-04 |
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