EP3627628A1 - Low-pitch miniature hyperfrequency coaxial connector, intended in particular for mutually connecting two printed circuit boards - Google Patents
Low-pitch miniature hyperfrequency coaxial connector, intended in particular for mutually connecting two printed circuit boards Download PDFInfo
- Publication number
- EP3627628A1 EP3627628A1 EP19197551.5A EP19197551A EP3627628A1 EP 3627628 A1 EP3627628 A1 EP 3627628A1 EP 19197551 A EP19197551 A EP 19197551A EP 3627628 A1 EP3627628 A1 EP 3627628A1
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- EP
- European Patent Office
- Prior art keywords
- central
- contact
- connector
- coaxial
- pcbs
- 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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Images
Classifications
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- 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
- H01R12/91—Coupling devices allowing relative movement between coupling parts, e.g. floating or self aligning
-
- 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
- H01R12/50—Fixed connections
- H01R12/51—Fixed connections for rigid printed circuits or like structures
- H01R12/52—Fixed connections for rigid printed circuits or like structures connecting to other rigid printed circuits or like structures
-
- 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
- H01R12/50—Fixed connections
- H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
- H01R12/61—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to flexible printed circuits, flat or ribbon cables or like structures
- H01R12/613—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to flexible printed circuits, flat or ribbon cables or like structures by means of interconnecting elements
- H01R12/616—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to flexible printed circuits, flat or ribbon cables or like structures by means of interconnecting elements having contacts penetrating insulation for making contact with conductors, e.g. needle points
-
- 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
- H01R12/73—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures connecting to other rigid printed circuits or like structures
-
- 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
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
Definitions
- the present invention relates to a microwave coaxial connector.
- a connector is intended in particular to connect two printed circuit boards (PCB acronym for “Printed Circuit Board”) or even a printed circuit board to another component such as a module or a filter.
- PCB printed circuit Board
- microwave connector is meant here and within the framework of the present invention, a connector capable of ensuring the transmission of signals in the microwave range, for example at frequencies between 1 GHz and 20 GHz, or even up to 100GHz, in particular equal to 40 GHz.
- contact is meant here and in the context of the present invention, an element made of electrically conductive material for letting the electric current pass.
- coaxial connectors comprising a first cylindrical connector element intended to be fixed, by one end, to a first printed circuit board, and a second cylindrical connector element intended to come into contact, at one end, with a second printed circuit card, each connector element comprising a central contact and an external contact separated by an insulator, the contacts central and external of the first and second connector elements having mutually contacting cylindrical surfaces, elastic means being interposed between the first and second connector elements and urging the central and external contacts of the second connector element towards the second card printed circuit board.
- the first connector element can be mechanically fixed, in particular by soldering, to the first printed circuit board and the second card is brought into abutment against the second connector element which is moved relative to the first connector element, the contacts of the second element connector being pressed under the action of elastic means against the conductive areas provided on the second card.
- elastic means are necessary to obtain a sufficient mechanical contact force, guaranteeing good electrical contact.
- Auxiliary means keep the second printed circuit board in position near the first printed circuit board, thus preventing the second connection element from disconnecting from the first connection element and from the second card printed circuit board.
- the patent application DE 102005033911 discloses a connector in which the elastic means are constituted by a central helical spring which also constitutes the central contact.
- a major drawback is that one of the ground contacts in the form of a solid cylinder is not really compressible, which does not guarantee a good electrical ground contact and to absorb relatively card-to-card tolerances important.
- the central spring induces an excessive inductance, unsuitable for the transmission of microwave signals.
- the patent US 7416418 discloses a microwave coaxial connector, said board-to-board, in which a first spring is interposed axially between the conductive rods of the connection elements. A second spring is interposed axially between the conductive bodies of the connection elements. The first connector member is attached to the first printed circuit board. When the second printed circuit board is brought against the second connection element, the springs push the rod and the body of the second connector element against the second printed circuit board, opposite the first connector element, so as to ensure satisfactory electrical contact between the second connector element and the second printed circuit board.
- the structure of this connector remains relatively complex.
- Embedded applications require board-to-board connection solutions with maximum integration densities while being less heavy.
- a microwave coaxial connector to connect two printed cards, separated by a distance (height) from card to card which can be between 3 to more than 20 mm, typically less than 1.5 mm, with tolerances on the distance between cards being up to 30% of this distance.
- the temperature soldering process involves a risk of damaging the connector and nearby electronic components on the PCB when these connectors are larger and massive.
- the invention aims to meet all or part of this need.
- the coaxial connector comprises one or more elastic return means for establishing a mechanical pressure between the end of the ground contacts and the two PCBs, the elastic return means (s) being independent of the insulating washers.
- each of the central contacts projects from its surrounding ground contact, in the connector disconnection configuration.
- each electrically insulating washer is mounted in an internal groove inside the central contact which it maintains.
- each insulating washer has star-shaped recesses.
- each insulating washer is made of polyimide.
- the central contact and the ground contact of the first or of the second connection element are soldered to one of the PCBs.
- the invention also relates to a multichannel connector, comprising at least two coaxial connectors described above, which extend around two parallel central axes.
- the multi-channel connector comprises a strip arranged vertically and which projects laterally so as to hang the multi-channel connector in a dedicated cell of an interface plate.
- a card-to-card connection can be made over a short distance over a wide range, typically between 3 and 20 mm, with tolerances on the distance between cards being up to 30% of this distance.
- the invention also makes it possible to reduce the size of each microwave link and therefore to reduce the pitch between two microwave links card to card.
- the invention makes it possible to achieve integration steps of the order of 2.5 mm and to significantly increase the number of card-to-card links.
- the connector has large tolerances to axial misalignment.
- the “card to card” mounting using a coaxial connector according to the invention can be carried out without prior individual holding of the connector with one and / or the other of the printed circuit boards, in particular by soldering the body.
- first conductor outside one of the cards preferably the lower one.
- the integration of a connector according to the invention can be simple and quick.
- the means for holding the connector beforehand on one and / or the other of the cards are clearly distinct from the elastic return means or in other words of the elastic mechanical holding of the central contacts and of the ground contacts allowing the maintaining the distance between cards in order to maintain the electrical connection.
- the contact force between each end of the central contacts and one of the two PCBs to be connected is constant regardless of the distance from the PCB, by the deflection of the electrically insulating washers which maintain a gap between the two central contacts and a pressure at the free end of each of them. This is very advantageous, especially in radar applications (Doppler effect).
- the contact force between each end of the ground contacts and one of the two PCBs to be connected is constant whatever the distance from the PCB thanks to the elastic return means.
- these elastic return means are judiciously arranged outside with respect to the HF line and do not come at all to disturb the transmitted signal.
- each coaxial connector can be greatly reduced, typically of the order of 2.5 mm, which makes it possible to achieve a high integration density.
- the electrical contacts being completely closed radially on themselves, ie over 360 °, the electrical contacts are homogeneous over the entire circumference of the contacts on the PCBs.
- the forces applied to the ground contacts by the elastic return means make it possible to maintain this homogeneity, whatever the conditions of use, in particular during mechanical vibrations.
- the performance of crosstalk and shielding to electromagnetic interference is greatly improved, especially in the multi-channel versions of the connectors.
- a plurality of coaxial connectors according to the invention is integrated in through cells of an interface plate dedicated to be arranged between the two PCBs to be connected. More specifically, the coaxial connectors are positioned in the through cells of the interface plate before positioning the last of the two PCBs.
- An interface plate connection system housing a plurality of coaxial connectors according to the invention has excellent crosstalk performance, each transmission channel being in its dedicated cell while being isolated from the others.
- the applications envisaged for a coaxial connector according to the invention are numerous, among which there may be mentioned, military and civil radar applications, space (observation satellites), telecommunications antenna networks, in particular for very high speed 5G .
- a coaxial connector 1 according to the invention which will be described is capable of carrying microwave signals, that is to say signals in the frequency range between 1 GHz and 20 GHz, or even up to 100 GHZ, in particular equal to 40 GHz.
- a microwave coaxial connector 1 according to the invention which extends around its central axis X, is provided for connecting two printed boards separated by a distance from card to card which may be small, but in a wide range, typically between 3 and 20 mm, with relatively large tolerances of around 30%.
- the Figures 1 to 5 show a microwave coaxial connector 1 comprising a first connection element 2, adapted to cooperate with a second connection element 3.
- the second connection element 3 is free to move, along the central axis X, relative to the first connection element 2, between a disconnection configuration, and a connection configuration in which the connection elements 2, 3 establish a central electrical and ground contact between two printed circuit boards (PCBs).
- PCBs printed circuit boards
- the central and ground contacts of the coaxial connector 1 establish the electrical contacts with compression.
- the first connection element 2 comprises a conductive body 20, which constitutes a ground contact, a conductive rod 21 which constitutes a central contact and at least one flexible electrically insulating washer 22, which in particular ensures the coaxial mechanical maintenance of the central contact 21 inside the ground contact 20, and also the transfer of the forces necessary for the compression of the two rigid ends lower 210 and upper 310 and of the conductive body 20.
- the conductive body 20, the conductive rod 21 and the flexible insulating washer 22 generally each have a symmetry of revolution about the axis X of the connector 1.
- This insulating washer 22 also performs an electrical insulating function in the microwave transmission line. . But the main insulator remains air, which makes it possible to reach an extremely low level of microwave losses.
- the body 20 has a general shape from its lower end 200 of a hollow cylinder of circular section, centered around the axis X which widens in the form of a truncated cone up to its upper end 201 formed by a plurality of elements shaped into petals.
- the rigid lower end 200 of the body 20 is intended to be in electrical and mechanical contact with a first of the printed circuit boards (PCB).
- PCB printed circuit boards
- the conductive rod 21 has a rigid lower end 210 in the form of a stud intended also to come into electrical and mechanical contact with the first PCB, and an upper end 211 in the form of a socket.
- the second connection element 3 for its part comprises a conductive body 30, which constitutes a ground contact, a conductive rod 31 which constitutes a central contact and at least one electrically insulating washer 32, flexible, which in particular ensures the mechanical coaxial maintenance of the central contact 31 inside the ground contact 30.
- the conductive body 30, the conductive rod 31 and the flexible insulating washer 32 each generally have a symmetry of revolution about the axis X of the connector 1.
- the body 30 has the general shape of a rigid hollow cylinder of circular section centered around the axis X from its upper end 300, to its lower end 301.
- the rigid upper end 300 of the body 30 is intended to be in electrical and mechanical contact with the second of the printed circuit boards (PCB).
- the conductive rod 31 is in the form of a rigid axis which has a rigid lower end 310 in the form of a stud also intended to come into electrical and mechanical contact with the first PCB.
- the electrical contact is guaranteed only by the upper end 201 of the ground contact 20 below, at the end of the prestressed petals in the lower end 301 of the ground contact 31 above.
- the microwave signal is then transmitted between the central line formed by the central contact 31 inserted in the socket 21 and the earth line formed by the earth contact 30 inserted in the other earth contact 20.
- this ball joint connection allows the geometric axes of the contacts 2, 3 not to be perfectly aligned and form an angle between them, without adversely affecting the quality of the electrical contacts on each PCB.
- the set of contacts is dimensioned so that each of the central contacts 21, 31 is necessarily projecting from its ground contact 20, 30 which surrounds it, when the coaxial connector 1 is in configuration disconnection, that is to say at rest or in other words without mechanical compression stress for a connection between two PCBs.
- the coaxial connector 1 is provided with two independent systems for pressing the contacts by elastic return, ie one to guarantee the mechanical pressurization of the ground contacts 20, 30 against the two PCBs to be connected, the other for mechanical pressurization of the central contacts 21, 31 against the two PCBs.
- the mechanical pressure for each of the electrical contacts between the end of a central contact and one or the other of the PCBs is guaranteed by the bending of one of the electrical insulating washers.
- the end 210 of the central contact 21 on the first PCB is guaranteed by the bending of at least one electrical insulating washer 22, while the end of the central contact 31 on the second PCB is guaranteed by the bending of at least minus an electrical insulating washer 32.
- the electrical insulating washers 22, 32 are mounted in internal grooves 202, 302 provided for this purpose inside the central contacts.
- the insulating washers 22, 32 have star-shaped recesses which allows them to avoid any undesired deformation during their bending by bending to obtain the desired pressurization of the central contacts 21, 31.
- the star washers 22, 32 do not undergo increased fatigue and / or tearing and their central hole thus perfectly maintains the central contact 21, 31 in the axial position. Any cut that would linearize the fatigue areas related to the bending of the washers 22, 32 would also be interesting.
- the electrically insulating washers 22, 32 are made of polyimide, of the Kapton® type. This material is perfectly suited to all thermal, electrical insulation and mechanical properties for the dual function of both coaxial mechanical holding of the central contacts and flexibility for mechanical pressure for the electrical contact of the central contacts on the two PCBs to connect.
- the mechanical pressure for each of the electrical contacts between the end of a ground contact and one or the other of the PCBs is guaranteed by elastic return means by compression 4 distinct from the insulating washers. 22, 32 and arranged outside the ground contacts 20, 30.
- the compression means 4 are constituted by two helical springs 40, arranged diametrically opposite with respect to the ground contacts 20, 30. This arrangement makes it possible to guarantee a minimal bulk of the connection, and therefore a denser integration, while retaining sufficient compression forces to guarantee the electrical performance of the connection.
- the coaxial connector 1 comprises two plates 23, 33 each coming to bear on an external shoulder of a ground contact.
- One of the ends of each helical spring 40 bears against one of the plates 23, and the other of the ends bears against the other of the plates 33.
- each plate 23, 33 comprises two holding rods 230, 330 around which the helical springs 40 are housed, in order to guide them.
- the springs 40 are prestressed.
- a leaf spring 41 can be arranged in place of the two helical springs 40. More specifically, the spring 41 comprises two flexible blades 42 arranged head to tail, that is to say with their camber in opposite directions, and which are interconnected at their ends 43. Each of the flexible blades 42 bears directly against one of the two ground contacts 20, 30.
- leaf spring 41 The advantage of a leaf spring 41 is that it eliminates the need for plates 23, 33 for supporting the coil springs 40.
- each ground contact 20, 30 with a one-piece extension 34 with the latter when the distance card-to-card of the two PCBs to be connected is greater, provision can be made to provide each ground contact 20, 30 with a one-piece extension 34 with the latter.
- each coaxial connector 1 is housed individually in a through cell of an interface plate, to be arranged at the interface between the two PCBs to be connected.
- FIG. 6 An example of parallel housing of two identical coaxial connectors 1 according to the invention is shown in figure 6 .
- Each of the two connectors 1 is housed in a cell 50 of an interface plate 5 between the two printed circuits, PCB1, PCB2 to be connected.
- the external shape of the connector 1 depends on the cell 50 in which each connector 1 is housed.
- a diamond shape of the support plates 23, 33 or of a leaf spring 41, as illustrated in the Figures 1 to 5 is advantageous because it allows a gain in bulk and therefore, in the end, it increases the integration density of the plurality of coaxial connectors 1.
- the arrangement outside of the elastic return means, ie the springs 4, for the ground contacts makes it possible to have a very small bulk in the axis perpendicular to the alignment of the springs relative to a solution according to the state of the art with a single coaxial spring inside, like that of the patent US 7416418 .
- the connector can be inserted into panel walls / interface plate 5 of very reduced thickness, typically of the order of 3 mm.
- the internal wall of the cells 50 serves as lateral guidance for the coil springs 40 but also for the leaf springs 41.
- the shape of the cells 50 can be adjusted as closely as possible to those of the springs 4 so that the latter are in individual contact with the internal wall of a cell 50 with sufficient friction to maintain each connector 1 in the cell. 50, even in the absence of PCBs.
- the figure 7B schematically represents the height of a central contact 31 of a coaxial connector 1 according to the invention with an insulating washer 32 of height H2.
- the figure 7A schematically represents the height of a central contact 31 of a coaxial connector 1 according to the state of the art with a central helical spring 40 of height H1 in its rest state.
- the gain in height per end induced by the invention is equal to H2-H1.
- the card-to-card distance is reduced with respect to the connectors of the prior art where the helical spring arranged in the axis of the central contact forms with the latter a piston.
- the figure 8A schematically represents a coaxial connector according to the state of the art with the coaxial location around the ground contacts 30 and central 31, of the single zone Z of generation of the restoring forces.
- the figure 8B schematically represents a coaxial connector according to the invention with a location in two zones Z1, Z2 for generating restoring forces, due to the external arrangement of the elastic restoring means 4 of the ground contact 30.
- the figure 10 shows another arrangement with optimized dimensions of a plurality of connectors according to the invention for a card-to-card link.
- the set of central contacts 21, 31 is then put under mechanical pressure by the bending deformation of the insulating washers 22, 32, until the end 210, 310 of the central contacts come in the plane defined by the ends 200 , 300 earth contacts 20, 30.
- All the ground contacts 20, 30 and central 21, 31 are then in mechanical and electrical contact with the two PCBs.
- Each coaxial connector 1 illustrated in Figures 1 to 5 is single-track.
- multichannel coaxial connectors in particular a two-way connector 10, as illustrated in figure 11 .
- This two-way connector 10 comprises two coaxial connectors 1.1, 1.2 like those which have been described previously, which extend around two central axes X1, X2 parallel and between support plates 23, 33 common to the two connectors.
- a strip 6 arranged vertically and which projects laterally from one and / or the other of the support plates 23, 33 makes it possible to hang the multi-way connector 10 in its dedicated socket of the interface plate, if at least one of the two PCBs to be connected is not arranged below the connector 10.
- the support plates 23, 33 of the coil springs 40 are parts clearly distinct from the ground contacts, it is equally possible to envisage that they are each in one piece with one of the ground contacts 20, 30.
- card-to-card connection which has been described with coaxial connectors 1 according to the invention and an interface plate with connector housing cells, makes it possible to produce a robust and complete card-to-card connection without welding, it is also possible to envisage soldering the contacts on one side, that is to say to one of the two PCBs to be connected.
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- Coupling Device And Connection With Printed Circuit (AREA)
Abstract
Connecteur coaxial (1) hyperfréquence, destiné à relier deux cartes de circuit imprimé (PCB) entre elles, d'axe central (X) comprenant :
- deux éléments de connexions (2, 3) avec chacun un contact central et un contact de masse, les contacts de masse (30) et central (31) du deuxième élément étant libres de se déplacer, le long de l'axe (X), par rapport à ceux (20, 21) du premier élément, entre une configuration de déconnexion, et une configuration de connexion dans laquelle les éléments sont destinés à établir un contact électrique de masse et central entre les deux PCB ;
- au moins une rondelle électriquement isolante (32), flexible, qui permet à la fois le maintien mécanique coaxial entre chaque contact central à l'intérieur du contact de masse du premier ou du deuxième élément de connexion, et d'établir une pression mécanique entre l'extrémité du contact central et un des deux PCB.
Microwave coaxial connector (1), intended to connect two printed circuit boards (PCB) together, with a central axis (X) comprising:
- two connection elements (2, 3) each with a central contact and a ground contact, the earth contacts (30) and central (31) of the second element being free to move, along the axis (X ), with respect to those (20, 21) of the first element, between a disconnection configuration, and a connection configuration in which the elements are intended to establish a ground and central electrical contact between the two PCBs;
- At least one electrically insulating washer (32), flexible, which allows both mechanical coaxial maintenance between each central contact inside the ground contact of the first or second connection element, and to establish a mechanical pressure between the end of the central contact and one of the two PCBs.
Description
La présente invention concerne un connecteur coaxial hyperfréquence. Un tel connecteur est destiné notamment à relier deux cartes de circuit imprimé (PCB acronyme anglais de « Printed Circuit Board ») ou encore une carte de circuit imprimé à un autre composant tel qu'un module ou un filtre.The present invention relates to a microwave coaxial connector. Such a connector is intended in particular to connect two printed circuit boards (PCB acronym for “Printed Circuit Board”) or even a printed circuit board to another component such as a module or a filter.
Par « connecteur hyperfréquence », on entend ici et dans le cadre de la présente invention, un connecteur apte à assurer la transmission de signaux dans la gamme des hyperfréquences, par exemple à des fréquences comprises entre 1 GHz et 20 GHz, voire jusqu'à 100GHz, notamment égales à 40 GHz.By “microwave connector” is meant here and within the framework of the present invention, a connector capable of ensuring the transmission of signals in the microwave range, for example at frequencies between 1 GHz and 20 GHz, or even up to 100GHz, in particular equal to 40 GHz.
Par « contact », on entend ici et dans le cadre de la présente invention, un élément en matériau conducteur électrique pour laisser passer le courant électrique.By "contact" is meant here and in the context of the present invention, an element made of electrically conductive material for letting the electric current pass.
Pour établir une liaison coaxiale entre deux cartes de circuit imprimé parallèles et plus ou moins proches l'une de l'autre, on connaît les connecteurs coaxiaux, comportant un premier élément de connecteur cylindrique destiné à être fixé, par une extrémité, à une première carte de circuit imprimé, et un deuxième élément de connecteur cylindrique destiné à venir au contact, par une extrémité, d'une deuxième carte de circuit imprimé, chaque élément de connecteur comportant un contact central et un contact extérieur séparés par un isolant, les contacts centraux et extérieurs des premier et deuxième éléments de connecteurs comportant des portées cylindriques mutuellement en contact, des moyens élastiques étant interposés entre les premier et deuxième éléments de connecteur et sollicitant les contacts central et extérieur du deuxième élément de connecteur en direction de la deuxième carte de circuit imprimé.To establish a coaxial connection between two parallel printed circuit boards which are more or less close to one another, coaxial connectors are known, comprising a first cylindrical connector element intended to be fixed, by one end, to a first printed circuit board, and a second cylindrical connector element intended to come into contact, at one end, with a second printed circuit card, each connector element comprising a central contact and an external contact separated by an insulator, the contacts central and external of the first and second connector elements having mutually contacting cylindrical surfaces, elastic means being interposed between the first and second connector elements and urging the central and external contacts of the second connector element towards the second card printed circuit board.
Le premier élément de connecteur peut être fixé mécaniquement, notamment par brasage, à la première carte de circuit imprimé et la deuxième carte est amenée en appui contre le second élément de connecteur qui est déplacé relativement au premier élément de connecteur, les contacts du second élément de connecteur étant pressés sous l'action des moyens élastiques contre les zones conductrices prévues sur la deuxième carte. Ainsi, ces moyens élastiques sont nécessaires pour obtenir un effort de contact mécanique suffisant, garant d'un bon contact électrique.The first connector element can be mechanically fixed, in particular by soldering, to the first printed circuit board and the second card is brought into abutment against the second connector element which is moved relative to the first connector element, the contacts of the second element connector being pressed under the action of elastic means against the conductive areas provided on the second card. Thus, these elastic means are necessary to obtain a sufficient mechanical contact force, guaranteeing good electrical contact.
Des moyens auxiliaires assurent le maintien en position de la seconde carte de circuit imprimé à proximité de la première carte de circuit imprimé, empêchant ainsi le second élément de connexion de se déconnecter vis-à-vis du premier élément de connexion et de la seconde carte de circuit imprimé.Auxiliary means keep the second printed circuit board in position near the first printed circuit board, thus preventing the second connection element from disconnecting from the first connection element and from the second card printed circuit board.
Un connecteur de ce type dans lequel les moyens élastiques sont des joints toriques en élastomère est décrit dans le brevet
La demande de brevet
Le brevet
Pour s'affranchir de l'inconvénient lié à l'utilisation des deux ressorts du brevet
Les applications embarquées requièrent des solutions de connexion carte-à-carte avec des densités d'intégration maximales tout en étant de poids moindre.Embedded applications require board-to-board connection solutions with maximum integration densities while being less heavy.
Par ailleurs, les connecteurs coaxiaux existants pour des applications carte-à-carte ne sont pas conçus pour avoir des tolérances en déplacement et en compression importantes dans une large gamme de hauteur.Furthermore, existing coaxial connectors for board-to-board applications are not designed to have large displacement and compression tolerances over a wide range of heights.
Or, les inventeurs ont été confrontés à un besoin de connecteur coaxial hyperfréquence pour relier deux cartes imprimées, séparées d'une distance (hauteur) de carte à carte pouvant être comprise entre 3 à plus de 20mm, typiquement inférieure à 1,5 mm, avec des tolérances sur la distance entre cartes étant pouvant atteindre jusqu'à 30% de cette distance.However, the inventors were confronted with a need for a microwave coaxial connector to connect two printed cards, separated by a distance (height) from card to card which can be between 3 to more than 20 mm, typically less than 1.5 mm, with tolerances on the distance between cards being up to 30% of this distance.
Outre les inconvénients précités, la plupart des connecteurs coaxiaux connus pour des liaisons carte-à-carte nécessitent un process de brasage pour fixer chacune des extrémités longitudinales des connecteurs à un PCB. Cette solution n'est pas satisfaisante notamment lorsqu'un grand nombre de connexions est nécessaire car elle nécessite des précisions d'alignement trop élevées et implique des contraintes mécaniques sur chacun des connecteurs.In addition to the aforementioned drawbacks, most of the known coaxial connectors for board-to-board connections require a soldering process to fix each of the longitudinal ends of the connectors to a PCB. This solution is not satisfactory in particular when a large number of connections is necessary because it requires too high alignment accuracies and involves mechanical stresses on each of the connectors.
De plus, le procédé de brasage en température comporte un risque d'endommager le connecteur et les composants électroniques proches sur le PCB lorsque ces connecteurs sont plus volumineux et massifs.In addition, the temperature soldering process involves a risk of damaging the connector and nearby electronic components on the PCB when these connectors are larger and massive.
Il existe donc un besoin pour améliorer encore les connexions carte-à-carte, notamment afin de permettre une installation avec moins de, voire sans soudure, de compenser des tolérances de désalignement élevées, de maîtriser l'impédance avec des performances hyperfréquence élevées, d'obtenir des connexions pour une gamme de hauteur importante avec des tolérances en déplacement et en compression également importantes, d'atteindre des densités d'intégrations maximales pour un poids moindre.There is therefore a need to further improve the board-to-board connections, in particular to allow installation with less, or even soldering, to compensate for high misalignment tolerances, to control the impedance with high microwave performance, d '' obtain connections for a large height range with equally large displacement and compression tolerances, to achieve maximum integration densities for a lower weight.
L'invention vise à répondre à tout ou partie de ce besoin.The invention aims to meet all or part of this need.
L'invention a ainsi pour objet, selon l'un de ses aspects, un connecteur coaxial hyperfréquence, destiné notamment à relier deux cartes de circuit imprimé entre elles, d'axe central (X) comprenant :
- un premier élément de connexion comprenant un corps conducteur, formant un contact de masse, et une tige conductrice formant un contact central agencé à l'intérieur du contact de masse;
- un deuxième élément de connexion comprenant un corps conducteur, formant un contact de masse, une tige conductrice formant un contact central agencé à l'intérieur du contact de masse; les contacts de masse et central du deuxième élément de connexion étant libres de se déplacer, le long de l'axe central (X), par rapport à ceux du premier élément de connexion, entre une configuration de déconnexion, et une configuration de connexion dans laquelle le premier et le deuxième éléments de connexion sont destinés à établir un contact électrique de masse et un contact électrique central entre les deux PCB ;
- au moins une rondelle électriquement isolante, flexible, qui permet à la fois le maintien mécanique coaxial entre chaque contact central à l'intérieur du contact de masse du premier ou du deuxième élément de connexion, et d'établir une pression mécanique entre l'extrémité du contact central et un des deux PCB.
- a first connection element comprising a conductive body, forming a ground contact, and a conductive rod forming a central contact arranged inside the ground contact;
- a second connection element comprising a conductive body forming a ground contact, a conductive rod forming a central contact arranged inside the ground contact; the earth and central contacts of the second connection element being free to move, along the central axis (X), relative to those of the first connection element, between a disconnection configuration, and a connection configuration in which the first and second connection elements are intended to establish an electrical ground contact and a central electrical contact between the two PCBs;
- at least one electrically insulating, flexible washer, which allows both mechanical coaxial maintenance between each central contact inside the earth contact of the first or second connection element, and to establish a mechanical pressure between the end from the central contact and one of the two PCBs.
Selon un mode de réalisation avantageux, le connecteur coaxial comprend un ou des moyens de rappel élastique pour établir une pression mécanique entre l'extrémité des contacts de masse et les deux PCB, le(s) moyen(s) de rappel élastique étant indépendants des rondelles isolantes.According to an advantageous embodiment, the coaxial connector comprises one or more elastic return means for establishing a mechanical pressure between the end of the ground contacts and the two PCBs, the elastic return means (s) being independent of the insulating washers.
De préférence, chacun des contacts centraux est en saillie par rapport à son contact de masse qui l'entoure, en configuration de déconnexion du connecteur.Preferably, each of the central contacts projects from its surrounding ground contact, in the connector disconnection configuration.
Selon une variante de réalisation avantageuse, chaque rondelle électriquement isolante est montée dans une gorge intérieure à l'intérieur du contact central qu'elle maintient.According to an advantageous alternative embodiment, each electrically insulating washer is mounted in an internal groove inside the central contact which it maintains.
Avantageusement, chaque rondelle isolante présente des évidements en forme d'étoile.Advantageously, each insulating washer has star-shaped recesses.
De préférence, chaque rondelle isolante est en polyimide.Preferably, each insulating washer is made of polyimide.
Selon une configuration d'installation avantageuse, le contact central et le contact de masse du premier ou du deuxième élément de connexion sont soudés sur l'un des PCB.According to an advantageous installation configuration, the central contact and the ground contact of the first or of the second connection element are soldered to one of the PCBs.
L'invention concerne également un connecteur multivoie, comprenant au moins deux connecteurs coaxiaux décrits précédemment, qui s'étendent autour de deux axes centraux parallèles.The invention also relates to a multichannel connector, comprising at least two coaxial connectors described above, which extend around two parallel central axes.
Selon un mode de réalisation avantageux, le connecteur multivoie comprend une lamelle agencée à la verticale et qui fait saillie latéralement de sorte à d'accrocher le connecteur multivoie dans une alvéole dédiée d'une plaque d'interface.According to an advantageous embodiment, the multi-channel connector comprises a strip arranged vertically and which projects laterally so as to hang the multi-channel connector in a dedicated cell of an interface plate.
L'invention a enfin pour objet un module de connexion, destiné notamment à relier deux cartes de circuit imprimé (PCB) entre elles, comprenant :
- une plaque d'interface comprenant une pluralité d'alvéoles traversantes, la plaque d'interface étant destinée à être agencée entre les deux PCB ;
- une pluralité de connecteurs décrits précédemment, logés individuellement dans une alvéole de la plaque d'interface.
- an interface plate comprising a plurality of through cells, the interface plate being intended to be arranged between the two PCBs;
- a plurality of connectors described above, housed individually in a cell of the interface plate.
Grâce à l'invention, on peut réaliser une connexion carte-à carte sur une faible distance dans une large gamme, typiquement comprise entre 3 et 20 mm, avec des tolérances sur la distance entre cartes étant pouvant atteindre jusqu'à 30% de cette distance.Thanks to the invention, a card-to-card connection can be made over a short distance over a wide range, typically between 3 and 20 mm, with tolerances on the distance between cards being up to 30% of this distance.
L'invention permet également de réduire l'encombrement de chaque liaison hyperfréquence et donc de réduire le pas entre deux liaisons hyperfréquences carte à carte. L'invention permet d'atteindre des pas d'intégration de l'ordre de 2,5 mm et de densifier notablement le nombre de liaisons carte à carte.The invention also makes it possible to reduce the size of each microwave link and therefore to reduce the pitch between two microwave links card to card. The invention makes it possible to achieve integration steps of the order of 2.5 mm and to significantly increase the number of card-to-card links.
L'encombrement de cette connexion est très faible et permet une intégration de très haute densité.The size of this connection is very small and allows very high density integration.
En outre, le connecteur présente des tolérances importantes au désalignement axial.In addition, the connector has large tolerances to axial misalignment.
Le montage « carte à carte » à l'aide d'un connecteur coaxial selon l'invention peut être réalisé sans maintien préalable individuel du connecteur avec l'une et/ou l'autre des cartes de circuit imprimé, notamment par brasage du corps premier conducteur extérieur à une des cartes, de préférence à celle inférieure. Autrement dit, l'intégration d'un connecteur selon l'invention peut être simple et rapide.The “card to card” mounting using a coaxial connector according to the invention can be carried out without prior individual holding of the connector with one and / or the other of the printed circuit boards, in particular by soldering the body. first conductor outside one of the cards, preferably the lower one. In other words, the integration of a connector according to the invention can be simple and quick.
On précise ici que bien entendu les moyens de maintien préalable du connecteur à l'une et/ou l'autre des cartes sont clairement distincts des moyens de rappel élastique ou autrement dit de maintien mécanique élastiques des contacts centraux et des contacts de masse permettant le maintien de la distance entre cartes afin de conserver la connexion électrique.It is specified here that of course the means for holding the connector beforehand on one and / or the other of the cards are clearly distinct from the elastic return means or in other words of the elastic mechanical holding of the central contacts and of the ground contacts allowing the maintaining the distance between cards in order to maintain the electrical connection.
L'effort de contact entre chaque extrémité des contacts centraux et un des deux PCB à relier est constant quelle que soit la distance avec le PCB, par la déflexion des rondelles isolantes électriquement qui permettent de maintenir un écart entre les deux contacts centraux et une pression en extrémité libre de chacun d'entre eux. Cela est très avantageux, notamment dans les applications radar (effet Doppler).The contact force between each end of the central contacts and one of the two PCBs to be connected is constant regardless of the distance from the PCB, by the deflection of the electrically insulating washers which maintain a gap between the two central contacts and a pressure at the free end of each of them. This is very advantageous, especially in radar applications (Doppler effect).
De la même façon, l'effort de contact entre chaque extrémité des contacts de masse et un des deux PCB à relier est constant quelle que soit la distance avec le PCB grâce aux moyens de rappel élastique. En outre, ces moyens de rappel élastiques sont judicieusement agencés à l'extérieur par rapport à la ligne HF et ne viennent absolument pas perturber le signal transmis.In the same way, the contact force between each end of the ground contacts and one of the two PCBs to be connected is constant whatever the distance from the PCB thanks to the elastic return means. In addition, these elastic return means are judiciously arranged outside with respect to the HF line and do not come at all to disturb the transmitted signal.
De plus, ces efforts sur les contacts de masse d'une part et ceux sur les contacts centraux d'autre part sont indépendants grâce aux deux systèmes indépendants l'un de l'autre, les moyens de rappel élastique à l'extérieur pour les contacts de masse, et les rondelles élastiques pour les contacts centraux. Cela garantit un contact radiofréquence sur PCB constant et homogène.In addition, these efforts on the ground contacts on the one hand and those on the central contacts on the other hand are independent thanks to the two systems independent of each other, the elastic return means on the outside for the ground contacts, and spring washers for central contacts. This guarantees constant and homogeneous radio frequency contact on PCB.
Le diamètre extérieur de chaque connecteur coaxial peut être très réduit, typiquement de l'ordre de 2,5 mm, ce qui permet d'atteindre une grande densité d'intégration.The outer diameter of each coaxial connector can be greatly reduced, typically of the order of 2.5 mm, which makes it possible to achieve a high integration density.
De plus, les contacts extérieurs de masse étant complètement fermés radialement sur eux-mêmes, i.e. sur 360°, les contacts électriques sont homogènes sur toute la circonférence des contacts sur les PCB. Les efforts appliqués sur les contacts de masse par les moyens de rappel élastique (ressorts hélicoïdaux, à lames) permettent de maintenir cette homogénéité, quelles que soient les conditions d'utilisation, notamment lors de vibrations mécaniques. Les performances de diaphonie et de blindage aux interférences électromagnétiques (EMI pour « ElectroMagnetic Interferences ») sont grandement améliorées, notamment dans les versions multivoies des connecteurs.In addition, the external ground contacts being completely closed radially on themselves, ie over 360 °, the electrical contacts are homogeneous over the entire circumference of the contacts on the PCBs. The forces applied to the ground contacts by the elastic return means (helical, leaf springs) make it possible to maintain this homogeneity, whatever the conditions of use, in particular during mechanical vibrations. The performance of crosstalk and shielding to electromagnetic interference (EMI for “ ElectroMagnetic Interferences ”) is greatly improved, especially in the multi-channel versions of the connectors.
Une pluralité de connecteurs coaxiaux selon l'invention est intégrée dans des alvéoles traversantes d'une plaque d'interface dédiée à agencer entre les deux PCB à relier. Plus précisément, les connecteurs coaxiaux sont positionnés dans les alvéoles traversantes de la plaque d'interface avant de positionner le dernier des deux PCB.A plurality of coaxial connectors according to the invention is integrated in through cells of an interface plate dedicated to be arranged between the two PCBs to be connected. More specifically, the coaxial connectors are positioned in the through cells of the interface plate before positioning the last of the two PCBs.
De fait, on peut avantageusement prévoir une forme d'alvéole très ajustée de sorte que les moyens de maintien mécanique élastiques des contacts de masse (ressorts hélicoïdaux, ressort à lames) sont en contact avec la paroi interne de l'alvéole et la friction est suffisante pour maintenir le connecteur dans l'alvéole, même sans la présence de PCB.In fact, it is advantageously possible to provide a very adjusted shape of cell so that the elastic mechanical holding means of the ground contacts (springs helical, leaf spring) are in contact with the internal wall of the cell and there is sufficient friction to keep the connector in the cell, even without the presence of PCBs.
Un système de connexion à plaque d'interface logeant une pluralité de connecteurs coaxiaux selon l'invention présente d'excellentes performances en diaphonie, chaque voie de transmission étant dans son alvéole dédiée en étant isolée des autres.An interface plate connection system housing a plurality of coaxial connectors according to the invention has excellent crosstalk performance, each transmission channel being in its dedicated cell while being isolated from the others.
Les applications envisagées pour un connecteur coaxial selon l'invention sont nombreuses parmi lesquelles on peut citer, les applications radar militaires et civiles, le spatial (satellites d'observation), les réseaux d'antennes de télécommunications, notamment pour le très haut débit 5G.The applications envisaged for a coaxial connector according to the invention are numerous, among which there may be mentioned, military and civil radar applications, space (observation satellites), telecommunications antenna networks, in particular for very high speed 5G .
D'autres avantages et caractéristiques de l'invention ressortiront mieux à la lecture de la description détaillée d'exemples de mise en oeuvre de l'invention faite à titre illustratif et non limitatif en référence aux figures suivantes parmi lesquelles :
- la
figure 1 représente en vue en perspective un premier exemple de connecteur coaxial hyperfréquence conforme à l'invention ; - la
figure 2 est une autre vue en perspective du connecteur selon lafigure 1 ; - la
figure 2A est une vue en coupe longitudinale du connecteur selon lesfigures 1 ;et 2 - la
figure 3 est une vue en perspective d'une variante du connecteur coaxial selon lesfigures 1 à 2A ; - la
figure 4 représente en vue en perspective un deuxième exemple de connecteur coaxial hyperfréquence, conforme à l'invention ; - la
figure 5 est une vue en perspective d'une variante du connecteur coaxial selon lafigure 4 ; - la
figure 6 représente en vue de coupe longitudinale deux connecteurs coaxiaux monovoies selon l'invention dans leurs alvéoles respectives d'une plaque d'interface agencée entre deux PCB à relier; - les
figures 7A et 7B représentent schématiquement la hauteur minimale nécessaire de la ligne centrale d'un connecteur coaxial respectivement selon l'état de l'art et selon l'invention ; - les
figures 8A et 8B représentent schématiquement en vue de dessus un connecteur coaxial respectivement selon l'état de l'art et selon l'invention avec les zones symbolisées de génération des forces de rappel qu'il engendre ; - les
figures 9A et 9B reprennent les schémas desfigures 8A et 8B mais pour une pluralité de connecteurs coaxiaux; - la
figure 10 représente schématiquement un autre agencement optimal d'une pluralité de connecteurs coaxiaux selon l'invention avec pour chacun les zones symbolisées de génération des forces de rappel qu'il engendre ; - la
figure 11 représente en vue en perspective et en coupe partielle d'un exemple de connecteur coaxial hyperfréquence multivoies selon l'invention.
- the
figure 1 shows in perspective view a first example of microwave coaxial connector according to the invention; - the
figure 2 is another perspective view of the connector according to thefigure 1 ; - the
figure 2A is a longitudinal section view of the connector according to theFigures 1 and 2 ; - the
figure 3 is a perspective view of a variant of the coaxial connector according to theFigures 1 to 2A ; - the
figure 4 shows in perspective view a second example of microwave coaxial connector, according to the invention; - the
figure 5 is a perspective view of a variant of the coaxial connector according to thefigure 4 ; - the
figure 6 shows in longitudinal section two coaxial single-track connectors according to the invention in their respective cells of an interface plate arranged between two PCBs to be connected; - the
Figures 7A and 7B schematically represent the minimum necessary height of the central line of a coaxial connector respectively according to the state of the art and according to the invention; - the
Figures 8A and 8B schematically represent a top view of a coaxial connector respectively according to the state of the art and according to the invention with the symbolized zones of generation of the restoring forces which it generates; - the
Figures 9A and 9B use the diagrams ofFigures 8A and 8B but for a plurality of coaxial connectors; - the
figure 10 schematically represents another optimal arrangement of a plurality of coaxial connectors according to the invention with for each the symbolized zones of generation of restoring forces which it generates; - the
figure 11 shows in perspective view and in partial section of an example of a multi-channel microwave coaxial connector according to the invention.
Dans l'ensemble de la présente demande, les termes « vertical », « inférieur », « supérieur », « bas », « haut », « dessous » et « dessus» sont à comprendre par référence par rapport à un connecteur coaxial hyperfréquence en configuration verticale avec l'élément de connexion 2 en dessous de l'élément de connexion 3.Throughout the present application, the terms "vertical", "lower", "upper", "bottom", "high", "below" and "above" are to be understood by reference with respect to a microwave coaxial connector in vertical configuration with the
De même, les termes «interne» et «externe » sont à comprendre par rapport à l'axe central X du connecteur coaxial : une paroi interne est située à l'intérieur du connecteur et tournée vers l'axe, tandis qu'une paroi externe est tournée dans un sens opposé, vers l'extérieur du connecteur 1.Similarly, the terms "internal" and "external" are to be understood with respect to the central axis X of the coaxial connector: an internal wall is located inside the connector and faces the axis, while a wall external is turned in an opposite direction, towards the outside of
Par souci de clarté, une même référence numérique est utilisée pour un même élément d'un connecteur coaxial selon l'état de l'art et d'un connecteur coaxial selon l'invention.For the sake of clarity, the same reference number is used for the same element of a coaxial connector according to the state of the art and of a coaxial connector according to the invention.
Un connecteur coaxial 1 selon l'invention qui va être décrit est apte à véhiculer des signaux hyperfréquences, c'est-à-dire des signaux dans la gamme de fréquences comprises entre 1 GHz et 20 GHz, voire jusqu'à 100 GHZ, notamment égales à 40 GHz.A
On a représenté sur la
Un connecteur coaxial hyperfréquence 1 selon l'invention qui s'étend autour de son axe central X, est prévu pour relier deux cartes imprimées séparées d'une distance de carte à carte qui peut être faible, mais dans une gamme large, typiquement comprise entre 3 et 20 mm, avec des tolérances relativement importantes de l'ordre de 30%.A microwave
Les
Le second élément de connexion 3 est libre de se déplacer, le long de l'axe central X, par rapport au premier élément de connexion 2, entre une configuration de déconnexion, et une configuration de connexion dans laquelle les éléments de connexion 2, 3 établissent un contact électrique central et un de masse entre deux cartes de circuit imprimé (PCB).The
Dans la configuration de connexion, les contacts centraux et de masse du connecteur coaxial 1 établissent les contacts électriques avec compression.In the connection configuration, the central and ground contacts of the
Le premier élément de connexion 2 comprend un corps conducteur 20, qui constitue un contact de masse, une tige conductrice 21 qui constitue un contact central et au moins une rondelle électriquement isolante 22, flexible, qui assure notamment le maintien mécanique coaxial du contact central 21 à l'intérieur du contact de masse 20, et également le report des efforts nécessaires à la mise en compression des deux extrémités rigides inférieure 210 et supérieure 310 et du corps conducteur 20.The
Le corps conducteur 20, la tige conductrice 21 et la rondelle isolante flexible 22 présentent globalement chacun une symétrie de révolution autour de l'axe X du connecteur 1. Cette rondelle isolante 22 assure aussi une fonction d'isolant électrique dans la ligne de transmission hyperfréquence. Mais l'isolant principal reste l'air, ce qui permet d'atteindre un niveau de pertes hyperfréquences extrêmement faible.The
Le corps 20 a une forme générale depuis son extrémité inférieure 200 d'un cylindre creux de section circulaire, centré autour de l'axe X qui s'évase sous la forme d'un tronc de cône jusqu'à son extrémité supérieure 201 formée par une pluralité d'éléments conformés en pétales.The
L'extrémité inférieure rigide 200 du corps 20 est destinée à être en contact électrique et mécanique avec une première des cartes de circuit imprimé (PCB).The rigid
La tige conductrice 21 présente une extrémité inférieure rigide 210 en forme de téton destinée également à venir en contact électrique et mécanique avec la première PCB, et une extrémité supérieure 211 sous la forme d'une douille.The
Le deuxième élément de connexion 3 quant à lui comprend un corps conducteur 30, qui constitue un contact de masse, une tige conductrice 31 qui constitue un contact central et au moins une rondelle électriquement isolante 32, flexible, qui assure notamment le maintien mécanique coaxial du contact central 31 à l'intérieur du contact de masse 30.The
Le corps conducteur 30, la tige conductrice 31 et la rondelle isolante flexible 32 présentent globalement chacun une symétrie de révolution autour de l'axe X du connecteur 1.The
Le corps 30 a une forme générale d'un cylindre creux rigide de section circulaire centré autour de l'axe X depuis son extrémité supérieure 300, jusqu'à son extrémité inférieure 301.The
L'extrémité supérieure rigide 300 du corps 30 est destinée à être en contact électrique et mécanique avec la deuxième des cartes de circuit imprimé (PCB).The rigid
La tige conductrice 31 est sous la forme d'un axe rigide qui présente une extrémité inférieure rigide 310 en forme de téton destinée également à venir en contact électrique et mécanique avec la première PCB.The
Dans la configuration assemblée du connecteur coaxial, illustrée en
De même, le contact électrique est garanti seulement par l'extrémité supérieure 201 du contact de masse 20 du dessous, en bout des pétales précontraintes dans l'extrémité inférieure 301 du contact de masse 31 du dessus. Le jeu de la partie tronconique formée par les pétales 201 à l'intérieur de l'extrémité 301 du contact de masse 30, forme en quelque sorte une liaison rotule.Likewise, the electrical contact is guaranteed only by the
Le signal hyperfréquence est alors transmis entre la ligne centrale formée par le contact central 31 inséré dans la douille 21 et la ligne de masse formée par le contact de masse 30 inséré dans l'autre contact de masse 20.The microwave signal is then transmitted between the central line formed by the
Dans une configuration où les deux PCB à relier ne sont pas parfaitement parallèles, cette liaison rotule permet aux axes géométriques des contacts 2, 3 de ne pas être parfaitement alignés et forment un angle entre eux, sans nuire à la qualité des contacts électriques sur chaque PCB.In a configuration where the two PCBs to be connected are not perfectly parallel, this ball joint connection allows the geometric axes of the
Selon l'invention, on dimensionne l'ensemble des contacts de sorte que chacun des contacts centraux 21, 31 soit nécessairement en saillie par rapport à son contact de masse 20, 30 qui l'entoure, lorsque le connecteur coaxial 1 est en configuration de déconnexion, c'est-à-dire au repos ou autrement dit sans sollicitation mécanique de compression en vue d'une liaison entre deux PCB.According to the invention, the set of contacts is dimensioned so that each of the
Par conséquent, selon l'invention, le connecteur coaxial 1 est prévu avec deux systèmes indépendants de mise en appui des contacts par rappel élastique, i.e. l'un pour garantir la mise en pression mécanique des contacts de masse 20, 30 contre les deux PCB à relier, l'autre pour la mise en pression mécanique des contacts centraux 21, 31 contre les deux PCB.Consequently, according to the invention, the
Selon l'invention, la pression mécanique pour chacun des contacts électriques entre l'extrémité d'un contact central et l'une ou l'autre des PCB est garantie par la flexion d'un des rondelles isolantes électrique.According to the invention, the mechanical pressure for each of the electrical contacts between the end of a central contact and one or the other of the PCBs is guaranteed by the bending of one of the electrical insulating washers.
Ainsi, l'extrémité 210 du contact central 21 sur la première PCB est garantie par la flexion d'au moins une rondelle isolante électrique 22, tandis que l'extrémité du contact central 31 sur la deuxième PCB est garantie par la flexion d'au moins une rondelle isolante électrique 32.Thus, the
Avantageusement, les rondelles isolantes électriques 22, 32 sont montées dans des gorges intérieures 202, 302 prévues à cet effet à l'intérieur des contacts centraux.Advantageously, the electrical insulating
De préférence, les rondelles isolantes 22, 32 présentent des évidements en forme d'étoile ce qui leur permet d'éviter toute déformation non souhaitée lors de leur cambrage par flexion pour obtenir la mise en pression désirée des contacts centraux 21, 31. Ainsi, à terme, les rondelles 22, 32 en étoile ne subissent pas de fatigue accentuée et/ou de déchirement et leur trou central maintient ainsi parfaitement le contact central 21, 31 en position axiale. Toute découpe qui permettrait de linéariser les zones de fatigue liées à la flexion des rondelles 22, 32 serait également intéressantes.Preferably, the insulating
De préférence encore, les rondelles 22, 32 isolantes électrique sont en polyimide, de type en Kapton®. Ce matériau est parfaitement adapté à l'ensemble des propriétés thermique, d'isolation électrique, et mécaniques pour la double fonction à la fois de maintien mécanique coaxial des contacts centraux et de flexibilité pour la pression mécanique pour le contact électrique des contacts centraux sur les deux PCB à relier.More preferably, the electrically insulating
Egalement, selon l'invention, la pression mécanique pour chacun des contacts électriques entre l'extrémité d'un contact de masse et l'une ou l'autre des PCB est garantie par des moyens de rappel élastique par compression 4 distincts des rondelles isolantes 22, 32 et agencés à l'extérieur des contacts de masse 20, 30.Also, according to the invention, the mechanical pressure for each of the electrical contacts between the end of a ground contact and one or the other of the PCBs is guaranteed by elastic return means by
Dans les exemples illustrés aux
Plus précisément, selon ce mode de réalisation, le connecteur coaxial 1 comprend deux platines 23, 33 chacune venant en appui sur un épaulement extérieur d'un contact de masse. Une des extrémités de chaque ressort hélicoïdal 40 vient en appui contre l'une des platines 23, et l'autre des extrémités vient en appui contre l'autre des platines 33.More specifically, according to this embodiment, the
Avantageusement, chaque platine 23, 33 comporte deux tiges de maintien 230, 330 autour desquelles les ressorts hélicoïdaux 40 sont logés, afin de les guider.Advantageously, each
De préférence, en configuration de déconnexion du connecteur qui correspond à une absence d'efforts longitudinaux sur les contacts, les ressorts 40 sont précontraints.Preferably, in the connector disconnection configuration which corresponds to an absence of longitudinal forces on the contacts, the
Comme illustré en
Un ressort à lames 41 a pour avantage de s'affranchir de l'utilisation des platines 23, 33 d'appui des ressorts hélicoïdaux 40.The advantage of a
Selon une variante de réalisation avantageuse, illustrée aux
Pour réaliser une liaison carte-à-carte, on met en oeuvre une pluralité de connecteurs coaxiaux 1 qui viennent d'être décrits.To make a card-to-card connection, a plurality of
Pour ce faire, chaque connecteur coaxial 1 est logé individuellement dans une alvéole traversante d'une plaque d'interface, à agencer à l'interface entre les deux PCB à relier.To do this, each
Un exemple de logement en parallèle de deux connecteurs coaxiaux identiques 1 selon l'invention est montré en
Chacun des deux connecteurs 1 est logé dans une alvéole 50 d'une plaque d'interface 5 entre les deux circuits imprimés, PCB1, PCB2 à relier.Each of the two
La forme extérieure du connecteur 1 dépend de l'alvéole 50 dans lequel vient se loger chaque connecteur 1.The external shape of the
Une forme en losange des platines d'appui 23, 33 ou encore d'un ressort à lames 41, telle qu'illustrée dans les
L'agencement à l'extérieur des moyens de rappel élastique, i.e. les ressorts 4, pour les contacts de masse permet d'avoir un encombrement très réduit dans l'axe perpendiculaire à l'alignement des ressorts par rapport à une solution selon l'état de l'art avec un seul ressort coaxial à l'intérieur, comme celui du brevet
La paroi interne des alvéoles 50 sert de guidage latéral aux ressorts hélicoïdaux 40 mais également aux ressorts à lames 41.The internal wall of the
En pratique, on peut ajuster au plus près la forme des alvéoles 50 à celles des ressorts 4 de sorte que ces derniers sont en contact individuellement avec la paroi interne d'une alvéole 50 avec une friction suffisante pour maintenir chaque connecteur 1 dans l'alvéole 50, et ce même en l'absence de PCB.In practice, the shape of the
Cela est avantageux au montage car on peut disposer d'un module assemblé, i.e. une plaque d'interface 5 dans les alvéoles 50 de laquelle sont montés et maintenus par friction les connecteurs coaxiaux 1.This is advantageous for mounting since it is possible to have an assembled module, i.e. an
La
La
Au final, le gain en hauteur par extrémité induit par l'invention, est égal à H2-H1.In the end, the gain in height per end induced by the invention is equal to H2-H1.
Ainsi, grâce à l'invention, en diminuant la hauteur de la ligne centrale, on diminue la distance carte à carte par rapport aux connecteurs de l'art antérieur où le ressort hélicoïdal agencé dans l'axe du contact central forme avec ce dernier un piston.Thus, thanks to the invention, by decreasing the height of the central line, the card-to-card distance is reduced with respect to the connectors of the prior art where the helical spring arranged in the axis of the central contact forms with the latter a piston.
La
La
Les
En comparant la configuration selon l'invention (
On voit d'ailleurs sur la
La
Une telle liaison entre deux PCB a lieu avec un module assemblé selon l'invention, de la manière suivante.Such a connection between two PCBs takes place with a module assembled according to the invention, in the following manner.
On met en place un module assemblé comme explicité ci-dessus, en approchant de part et d'autre les deux PCB à relier.We put in place an assembled module as explained above, by approaching on both sides the two PCBs to be connected.
L'ensemble des contacts centraux 21, 31 est alors mis en pression mécanique par la déformation en flexion des rondelles isolantes 22, 32, jusqu'à ce que l'extrémité 210, 310 des contacts centraux viennent dans le plan défini par les extrémités 200, 300 des contacts de masse 20, 30.The set of
Tous les contacts de masse 20, 30 et centraux 21, 31 sont alors en contact mécanique et électrique avec les deux PCB.All the
Puis, les ressorts hélicoïdaux 40 ou à lames 41 sont mis en pression mécanique, jusqu'à ce qu'on obtienne la côte d'espacement des PCB spécifiée avec la tolérance d'ajustement souhaitée.Then, the coil springs 40 or
Ainsi, avec les connecteurs coaxiaux 1 et une plaque d'interface à alvéoles pour loger les connecteurs coaxiaux 1, on peut réaliser une connexion carte-à-carte sans soudure.Thus, with the
Chaque connecteur coaxial 1 illustré aux
Il est possible d'envisager des connecteurs coaxiaux multivoies, notamment un connecteur à deux voies 10, comme illustré en
Ce connecteur à deux voies 10 comprend deux connecteurs coaxiaux 1.1, 1.2 comme ceux qui ont été décrits précédemment, qui s'étendent autour de deux axes centraux X1, X2 parallèles et entre des platines d'appui 23, 33 communes aux deux connecteurs.This two-
Une lamelle 6 agencée à la verticale et qui fait saillie latéralement de l'une et/ou l'autre des platines d'appui 23, 33 permet d'accrocher le connecteur multivoies 10 dans son alvéole dédiée de la plaque d'interface, si au moins un des deux PCB à relier n'est pas agencée en dessous du connecteur 10.A
D'autres variantes et améliorations peuvent être prévues sans pour autant sortir du cadre de l'invention.Other variants and improvements can be provided without departing from the scope of the invention.
Ainsi, si dans les exemples illustrés, le maintien coaxial d'un contact central 21, 31 à l'intérieur de son contact de masse 20, 30 est assuré par une rondelle isolante électrique 22, 32, on peut tout-à-fait envisager de les doubler, notamment en fonction des efforts de pression des contacts centraux 21, 31 que l'on souhaite leur attribuer.Thus, if in the examples illustrated, the coaxial maintenance of a
Également, si dans les exemples illustrés, les platines d'appui 23, 33 des ressorts hélicoïdaux 40 sont des pièces clairement distinctes des contacts de masse, on peut tout aussi bien envisager à ce qu'elles soient chacune monobloc avec un des contacts de masse 20, 30.Also, if in the examples illustrated, the
Si la liaison carte-à-carte qui a été décrite avec des connecteurs coaxiaux 1 selon l'invention et une plaque d'interface à alvéoles de logement des connecteurs, permet de réaliser une liaison carte-à-carte robuste et complète sans soudure, on peut aussi envisager de réaliser une soudure des contacts d'un côté c'est-à-dire à l'une des deux PCB à relier.If the card-to-card connection which has been described with
On peut aussi envisager de câbler l'un des côtés du connecteur alors que l'autre côté sera connecté à un PCB.We can also consider wiring one side of the connector while the other side will be connected to a PCB.
L'expression « comportant un » doit être comprise comme étant synonyme de « comportant au moins un », sauf si le contraire est spécifié.The expression "comprising a" should be understood as being synonymous with "comprising at least one", unless otherwise specified.
Claims (10)
Applications Claiming Priority (1)
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FR1858473A FR3086108B1 (en) | 2018-09-19 | 2018-09-19 | MINIATURE LOW STEP HYPERFREQUENCY COAXIAL CONNECTOR, INTENDED IN PARTICULAR FOR CONNECTING TWO PRINTED CIRCUIT BOARDS BETWEEN THEM |
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EP3627628A1 true EP3627628A1 (en) | 2020-03-25 |
EP3627628B1 EP3627628B1 (en) | 2022-08-31 |
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EP19197551.5A Active EP3627628B1 (en) | 2018-09-19 | 2019-09-16 | Low-pitch miniature hyperfrequency coaxial connector, intended in particular for mutually connecting two printed circuit boards |
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US (1) | US10944193B2 (en) |
EP (1) | EP3627628B1 (en) |
FR (1) | FR3086108B1 (en) |
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FR3086108B1 (en) * | 2018-09-19 | 2020-08-28 | Radiall Sa | MINIATURE LOW STEP HYPERFREQUENCY COAXIAL CONNECTOR, INTENDED IN PARTICULAR FOR CONNECTING TWO PRINTED CIRCUIT BOARDS BETWEEN THEM |
CN111509446A (en) * | 2019-01-31 | 2020-08-07 | 泰科电子(上海)有限公司 | Connector with a locking member |
CN112787120A (en) * | 2019-11-11 | 2021-05-11 | 康普技术有限责任公司 | Coaxial connector and board-to-board connector assembly |
CN112787121A (en) * | 2019-11-11 | 2021-05-11 | 康普技术有限责任公司 | Coaxial connector and board-to-board connector assembly |
TWI750868B (en) * | 2020-10-23 | 2021-12-21 | 禾昌興業股份有限公司 | Circular connector |
CN112601411B (en) * | 2020-12-04 | 2022-08-16 | Oppo广东移动通信有限公司 | Circuit board structure and electronic equipment |
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2018
- 2018-09-19 FR FR1858473A patent/FR3086108B1/en active Active
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- 2019-09-16 EP EP19197551.5A patent/EP3627628B1/en active Active
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Also Published As
Publication number | Publication date |
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FR3086108A1 (en) | 2020-03-20 |
US10944193B2 (en) | 2021-03-09 |
US20200091639A1 (en) | 2020-03-19 |
FR3086108B1 (en) | 2020-08-28 |
EP3627628B1 (en) | 2022-08-31 |
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