EP0117804B1 - Manufacturing method of a microwave cavity, and cavity obtained thereby - Google Patents

Manufacturing method of a microwave cavity, and cavity obtained thereby Download PDF

Info

Publication number
EP0117804B1
EP0117804B1 EP84400297A EP84400297A EP0117804B1 EP 0117804 B1 EP0117804 B1 EP 0117804B1 EP 84400297 A EP84400297 A EP 84400297A EP 84400297 A EP84400297 A EP 84400297A EP 0117804 B1 EP0117804 B1 EP 0117804B1
Authority
EP
European Patent Office
Prior art keywords
cavity
components
metal
process according
microwave
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.)
Expired
Application number
EP84400297A
Other languages
German (de)
French (fr)
Other versions
EP0117804A1 (en
Inventor
Jacques Urien
Elie Bressan
Jacques Danguy
Marcel Narzul
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Espace Industries SA
Original Assignee
Alcatel Espace Industries SA
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 Alcatel Espace Industries SA filed Critical Alcatel Espace Industries SA
Publication of EP0117804A1 publication Critical patent/EP0117804A1/en
Application granted granted Critical
Publication of EP0117804B1 publication Critical patent/EP0117804B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
    • H01P11/008—Manufacturing resonators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Definitions

  • the present invention relates to a method of manufacturing a microwave cavity and a cavity obtained by this method.
  • a microwave cavity is constituted by a dielectric medium, generally air or vacuum, surrounded by a metallic envelope forming an enclosure and the dimensions of which are determined to cause inside the enclosure the resonance of an electromagnetic wave.
  • the cavities are obtained either by mechanical assembly of parts machined from an iron-nickel alloy material, or by mechanical assembly of parts made of composite synthetic fibers / resin, metallic. These two solutions make it possible to obtain both a low coefficient of expansion and good mechanical rigidity.
  • Iron-nickel alloy cavities are heavy, which is a disadvantageous factor for their use in satellites. To reduce their weight, we seek to reduce the thickness of the envelope but below a certain thickness, it is no longer possible to machine the cavity without causing deformations.
  • the cavities made of synthetic materials for example carbon fiber
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is a method of manufacturing a microwave cavity according to which the various elements of the cavity are preformed before their assembly, the preformed elements then being covered by at least one metallic layer which is good conductor of electricity. , these various elements then being positioned to form the cavity, then all of these elements being fixed to one another by melting then cooling of the deposited metal covering said elements of the cavity, the melting of the deposited metal taking place in a single operation in a furnace brought to the melting temperature, characterized in that the adjacent elements constituting the cavity being of small thickness are kept in position before and during the melting operation by welding of metallic objects, of small dimension compared to the elements of the cavity, brought into contact with adjacent elements.
  • the main advantage of this process is that, thanks to the fusion of the deposited metal, on the one hand, the mechanical connection of the elementary parts to each other and, on the other hand, ensures perfect electrical continuity between the internal walls of the cavities, obtained since, the metallic deposits covering each elementary part merge to form a homogeneous crystal structure.
  • each of the parts 1, 2 and 3 is covered by successive deposits 5, 6, 7 of materials which are good conductors of electricity, constituted for example, in the case where the parts are made of iron-nickel, by a first layer of copper and a second layer of silver, the whole having an approximately equal thickness at 5 microns or higher, depending on the frequency of the electromagnetic wave which must resonate inside the cavity.
  • the copper layer serves as an adhesion layer to fix the silver layer.
  • the parts 1, 2 and 3 forming the elements of the cavity are positioned relatively with respect to each other according to the method of assembly shown in FIG. 1, to form the cavity.
  • Steel balls 8 to 11 are each welded between two adjacent elements to ensure a rigid mechanical connection of all the elements together before the next brazing operation.
  • the faces of the bottom 2 and of the cover 3, in contact with the ends of the section 1, have surfaces different from those of the end sections respectively in contact with the section 1, to allow each ball to be able to abut, in the angle formed by the adjacent parts which it connects.
  • the welding of the balls between each adjacent part is carried out, in a preferred embodiment of the invention, by a spot welding process consisting in carrying out an electrical discharge between each of the balls and the corresponding adjacent parts or elements to be connected.
  • the ball will, for example, first be held at the end of an electric current supply electrode by means of a vacuum gripper of known type, but not shown, then will be applied in contact with adjacent parts to be connected.
  • the electric power involved is determined for each type of cavity depending in particular on the thickness of the metal deposit covering each part or element e must be sufficient to allow the ball to pass through the deposit and weld on the underlying metal parts , without damaging them.
  • the fourth step of the method consists in carrying out the final assembly by brazing together preassembled parts in the third step, in an oven brought to high temperature, or any other equivalent means, to achieve the melting of the metal deposit covering metal parts 1 , 2 and 3 in one or more operations.
  • the cavity thus assembled is cooled slowly to obtain a simultaneous connection of all the parts which have been heated.
  • the method according to the invention makes it possible to obtain simultaneous brazing of pieces of about 4/10 0 mm in iron-nickel preassembled of a cavity, covered with a thickness of a deposit of copper and d money of 5 u. by melting the deposit at a temperature of up to 850 ° C.
  • the electrical surface conductivity of the internal walls of the cavity needs to be improved.
  • the process which has just been described can advantageously be supplemented by an electrolytic deposit of additional silver.
  • the filter of Figure 2 consists of two cavities placed end to end.
  • a first cavity comprises the same elements as the cavity in FIG. 1, identified by the same references 1 to 4 and the second cavity is constituted by a section 12 of which one end is placed in contact with the cover 3 of the first cavity and whose the other end is closed by a cover 13 pierced in its center by an iris 14.
  • the elements of the filter are produced in isolation and then assembled by ball welds such as balls 8 to 11 and 16 to 18 shown in Figure 2.
  • the method of pre-assembly which has just been described eliminates the use of complicated tools that could be used to pre-assemble the elementary parts before the brazing operation, it is necessary understand that this method of pre-assembly does not exclude the use of other tools.
  • other objects of any shape may be used instead of balls, which can advantageously replace the balls, to hold the elementary parts together during the brazing operation and, in certain cases, proceed in certain cases. to a direct spot weld of the adjacent joined elements without using intermediate steel objects.

Description

La présente invention concerne un procédé de fabrication d'une cavité hyperfréquence et une cavité obtenue par ce procédé.The present invention relates to a method of manufacturing a microwave cavity and a cavity obtained by this method.

Elle s'applique plus particulièrement à la réalisation de cavités et de filtres hyperfréquences pour satellites de télécommunications.It applies more particularly to the production of cavities and microwave filters for telecommunications satellites.

Une cavité hyperfréquence est constituée par un milieu diélectrique, généralement de l'air ou du vide, entouré par une enveloppe métallique formant enceinte et dont les dimensions sont déterminées pour provoquer à l'intérieur de l'enceinte la résonance d'une onde électromagnétique.A microwave cavity is constituted by a dielectric medium, generally air or vacuum, surrounded by a metallic envelope forming an enclosure and the dimensions of which are determined to cause inside the enclosure the resonance of an electromagnetic wave.

Dans les techniques de réalisation spatiales, et lorsqu'une grande stabilité thermique est requise les cavités sont obtenues, soit par assemblage mécanique de pièces usinées dans un matériau en alliage de fer-nickel, soit par assemblage mécanique de pièces réalisées en composite fibres synthétiques/résine, métallisé. Ces deux solutions permettent d'obtenir à la fois un faible coefficient de dilatation et une bonne rigidité mécanique.In spatial production techniques, and when high thermal stability is required, the cavities are obtained either by mechanical assembly of parts machined from an iron-nickel alloy material, or by mechanical assembly of parts made of composite synthetic fibers / resin, metallic. These two solutions make it possible to obtain both a low coefficient of expansion and good mechanical rigidity.

Les cavités en alliage fer-nickel sont lourdes, ce qui constitue un facteur pénalisant pour leur utilisation dans les satellites. Pour diminuer leur poids on cherche à diminuer l'épaisseur de l'enveloppe mais en dessous d'une certaine épaisseur, il n'est plus possible d'usiner la cavité sans provoquer de déformations.Iron-nickel alloy cavities are heavy, which is a disadvantageous factor for their use in satellites. To reduce their weight, we seek to reduce the thickness of the envelope but below a certain thickness, it is no longer possible to machine the cavity without causing deformations.

Dans le deuxième cas, les cavités en matériaux synthétiques, par exemple en fibre de carbone, ont des structures légères et des caractéristiques mécaniques particulièrement bien adaptées aux contraintes imposées par la réalisation des satellites mais leur coût de réalisation reste encore élevé.In the second case, the cavities made of synthetic materials, for example carbon fiber, have light structures and mechanical characteristics which are particularly well suited to the constraints imposed by the construction of the satellites, but their production cost is still high.

Enfin, dans les deux cas, les filtres étant constitués par assemblage mécanique de cavités élémentaires, les plans de coupure limitent un peu les performances électriques.Finally, in both cases, the filters being formed by mechanical assembly of elementary cavities, the cut-off planes slightly limit the electrical performance.

Le but de l'invention est de pallier les invonvé- nients précités.The object of the invention is to overcome the aforementioned drawbacks.

Un document de l'art antérieur, le document US-3 372 471, décrit une méthode de fabrication de composants microondes consistant à déposer par voie électrolytique une couche de nickel et à galvaniser au dessus une couche d'argent sur les éléments à assembler. L'assemblage est obtenu en pratiquant entre les éléments à assembler une soudure à l'aide d'un alliage eutectique cuivre argent porté à 780°C dans une enceinte de gaz inerte.A document of the prior art, document US Pat. No. 3,372,471, describes a method of manufacturing microwave components which consists in electrolytically depositing a layer of nickel and galvanizing above it a layer of silver on the elements to be assembled. The assembly is obtained by practicing between the elements to be assembled a weld using a eutectic alloy copper silver brought to 780 ° C in an enclosure of inert gas.

Par contre, l'invention a pour objet un procédé de fabrication d'une cavité hyperfréquence selon lequel les différents élements de la cavité sont préformés avant leur assemblage, les éléments préformés étant alors recouverts par au moins une couche métallique bonne conductrice de l'électricité, ces différents éléments étant alors positionnés pour former la cavité, puis l'ensemble de ces éléments étant fixés entre eux par fusion puis refroidissement du métal déposé recouvrant lesdits éléments de la cavité, la fusion du métal déposé ayant lieu en une seule opération dans un four porté à la température de fusion, caractérisé en ce que les éléments adjacents constituant la cavité étant de faible épaisseur sont maintenus en position avant et durant l'opération de fusion par soudage d'objets métalliques, de faible dimension par rapport aux éléments de la cavité, mis en contact avec les éléments adjacents.On the other hand, the subject of the invention is a method of manufacturing a microwave cavity according to which the various elements of the cavity are preformed before their assembly, the preformed elements then being covered by at least one metallic layer which is good conductor of electricity. , these various elements then being positioned to form the cavity, then all of these elements being fixed to one another by melting then cooling of the deposited metal covering said elements of the cavity, the melting of the deposited metal taking place in a single operation in a furnace brought to the melting temperature, characterized in that the adjacent elements constituting the cavity being of small thickness are kept in position before and during the melting operation by welding of metallic objects, of small dimension compared to the elements of the cavity, brought into contact with adjacent elements.

Ce procédé a pour principal avantage de permettre, grâce à la fusion du métal déposé, d'une part, la liaison mécanique des pièces élémentaires entre elles et d'autre part, d'assurer une parfaite continuité électrique entre les parois internes des cavités ainsi obtenues puisque, les dépôts métalliques recouvrant chaque pièce élémentaire fusionnent pour former une structure cristallique homogène.The main advantage of this process is that, thanks to the fusion of the deposited metal, on the one hand, the mechanical connection of the elementary parts to each other and, on the other hand, ensures perfect electrical continuity between the internal walls of the cavities, obtained since, the metallic deposits covering each elementary part merge to form a homogeneous crystal structure.

D'autre part, il sera possible, en choisissant judicieusement la nature et les épaisseurs des dépôts recouvrant chaque pièce élémentaire, de créer des compositions pouvant fondre à des températures constantes inférieures au point de fusion de chacun des constituants. Cette particularité sera particulièrement intéressante, dans le cas notamment, où les éléments préformés seront en alliage fer-nickel à très faible coefficient de dilatation et où les dépôts seront à base d'argent et de cuivre.On the other hand, it will be possible, by judiciously choosing the nature and the thicknesses of the deposits covering each elementary part, to create compositions which can melt at constant temperatures below the melting point of each of the constituents. This characteristic will be particularly interesting, in the case in particular, where the preformed elements will be of iron-nickel alloy with very low coefficient of expansion and where the deposits will be based on silver and copper.

D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description faite au regard des dessins annexés, donnés uniquement à titre d'exemple et dans lesquels:

  • La figure 1 représente un mode de préassemblage des éléments formant une cavité, destiné à maintenir les éléments entre eux durant l'opération de fusion.
  • La figure 2 représente un filtre hyperfréquence obtenu à l'aide du précédé selon l'invention.
  • La cavité représentée à la figure 1 comprend un tronçon 1 évidé à l'intérieur, de forme cylindrique, parallélépipédique ou similaire, aux extrémités duquel sont rapportées deux plaques métalliques 2 et 3 formant l'une le fond de la cavité, l'autre le couvercle. Dans l'exemple de la figure 1, le couvercle 3 est percé en son centre d'une fente 4 formant iris, pour éventuellement permettre le couplage de la cavité avec une autre cavité adjacente.
  • Le procédé selon l'invention consiste à fabriquer séparément chacun des pièces 1, 2 et 3, par emboutissage, roulage-soudage, découpage ou tout autre moyen de préformage équivalent, d'une tôle de faible épaisseur, de l'ordre de 4/10e mm, en matériau à faible coefficient de dilatation constitué par exemple, par un alliage fer-nickel, du type commercialisé sous la dénomination «Invar» ou tout autre matériau équivalent.
Other characteristics and advantages of the invention will appear during the description given with regard to the appended drawings, given solely by way of example and in which:
  • FIG. 1 represents a mode of pre-assembly of the elements forming a cavity, intended to hold the elements together during the melting operation.
  • FIG. 2 represents a microwave filter obtained using the method according to the invention.
  • The cavity shown in FIG. 1 comprises a section 1 hollowed out inside, of cylindrical, parallelepipedal or similar shape, at the ends of which are attached two metal plates 2 and 3, one forming the bottom of the cavity, the other the lid. In the example of FIG. 1, the cover 3 is pierced in its center with a slot 4 forming an iris, to optionally allow the coupling of the cavity with another adjacent cavity.
  • The method according to the invention consists in separately manufacturing each of parts 1, 2 and 3, by stamping, rolling-welding, cutting or any other equivalent preforming means, from a sheet of thin thickness, of the order of 4 / 10 e mm, made of a material with a low coefficient of expansion consisting, for example, of an iron-nickel alloy, of the type sold under the name "Invar" or any other equivalent material.

Dans une deuxième étape chacune des pièces 1, 2 et 3 est recouverte par des dépôts successifs 5, 6, 7 de matériaux bons conducteurs de l'électricité constitués par exemple, dans le cas où les pièces sont en fer-nickel, par une première couche de cuivre et une deuxième couche d'argent, l'ensemble ayant une épaisseur à peu près égale à 5 microns ou supérieure, suivant la fréquence de l'onde électromagnétique devant résonner à l'intérieur de la cavité. Dans ce cas la couche de cuivre sert de couche d'adhérence pour fixer la couche d'argent. Les procédés d'électrodépositions par voie électrolytique ou tous autres moyens équivalents permettant d'effectuer ces opérations sont connus et par conséquent leur description n'a pas besoin d'être plus longuement détaillée.In a second step, each of the parts 1, 2 and 3 is covered by successive deposits 5, 6, 7 of materials which are good conductors of electricity, constituted for example, in the case where the parts are made of iron-nickel, by a first layer of copper and a second layer of silver, the whole having an approximately equal thickness at 5 microns or higher, depending on the frequency of the electromagnetic wave which must resonate inside the cavity. In this case the copper layer serves as an adhesion layer to fix the silver layer. The electrodeposition processes by electrolytic route or any other equivalent means enabling these operations to be carried out are known and therefore their description need not be given in greater detail.

Dans une troisième étape les pièces 1, 2 et 3 formant les éléments de la cavité sont positionnées relativement les uns par rapport aux autres suivant le mode d'assemblage représenté à la figure 1, pour former la cavité. Des billes d'acier 8 à 11 sont soudées chacune entre deux éléments adjacents pour assurer une liaison mécanique rigide de tous les éléments entre eux avant l'opération suivante de brasage. Sur la figure 1 les faces du fond 2 et du couvercle 3, en contact avec les extrémités du tronçon 1, présentent des surfaces différentes de celles des sections d'extrémités respectivement en contact du tronçon 1, pour permettre à chaque bille de pouvoir abuter, dans l'angle formé par les pièces adjacentes qu'elle relie. La soudure des billes entre chaque pièce adjacente est réalisée, dans un mode préféré de réalisation de l'invention, par un procédé de soudage par point consistant à effectuer une décharge électrique entre chacune des billes et les pièces ou éléments adjacents correspondants à relier. Pour effectuer cette décharge, la bille sera, par exemple, d'abord maintenue à l'extrémité d'une électrode d'amenée du courant électrique au moyen d'un préhenseur à dépression de type connu, mais non représenté, puis sera appliquée en contact avec les pièces adjacentes à relier.In a third step, the parts 1, 2 and 3 forming the elements of the cavity are positioned relatively with respect to each other according to the method of assembly shown in FIG. 1, to form the cavity. Steel balls 8 to 11 are each welded between two adjacent elements to ensure a rigid mechanical connection of all the elements together before the next brazing operation. In FIG. 1, the faces of the bottom 2 and of the cover 3, in contact with the ends of the section 1, have surfaces different from those of the end sections respectively in contact with the section 1, to allow each ball to be able to abut, in the angle formed by the adjacent parts which it connects. The welding of the balls between each adjacent part is carried out, in a preferred embodiment of the invention, by a spot welding process consisting in carrying out an electrical discharge between each of the balls and the corresponding adjacent parts or elements to be connected. To carry out this discharge, the ball will, for example, first be held at the end of an electric current supply electrode by means of a vacuum gripper of known type, but not shown, then will be applied in contact with adjacent parts to be connected.

La puissance électrique mise en jeu est déterminée pour chaque type de cavité en fonction notamment de l'épaisseur du dépôt métallique recouvrant chaque pièce ou élément e doit être suffisante pour permettre à la bille de traverser le dépôt et se souder sur les parties métalliques sous jacentes, sans toutefois les endommager.The electric power involved is determined for each type of cavity depending in particular on the thickness of the metal deposit covering each part or element e must be sufficient to allow the ball to pass through the deposit and weld on the underlying metal parts , without damaging them.

La quatrième étape du procédé consiste à réaliser l'assemblage final par brasage entre elles des pièces préassemblées à la troisième étape, dans un four porté à haute température, ou tous autres moyens équivalents, pour réaliser la fusion du dépôt métallique recouvrant des pièces métalliques 1, 2 et 3 en une ou plusieurs opérations. A la fin de la quatrième étape la cavité ainsi assemblée est refroidie lentement pour obtenir une liaison simultanée de toutes les pièces qui ont été chauffées. A titre indicatif le procédé selon l'invention permet d'obtenir un brasage simultané de pièces d'environ 4/100 de mm en fer-nickel préassemblées d'une cavité, recouvertes d'une épaisseur d'un dépôt de cuivre et d'argent de 5 u. par fusion du dépôt à une température pouvant attein- dre 850°C.The fourth step of the method consists in carrying out the final assembly by brazing together preassembled parts in the third step, in an oven brought to high temperature, or any other equivalent means, to achieve the melting of the metal deposit covering metal parts 1 , 2 and 3 in one or more operations. At the end of the fourth step, the cavity thus assembled is cooled slowly to obtain a simultaneous connection of all the parts which have been heated. By way of indication, the method according to the invention makes it possible to obtain simultaneous brazing of pieces of about 4/10 0 mm in iron-nickel preassembled of a cavity, covered with a thickness of a deposit of copper and d money of 5 u. by melting the deposit at a temperature of up to 850 ° C.

A ce stade du procédé, il est possible que la conductibilité électrique de surface des parois internes de la cavité ait besoin d'être améliorée. Dans ce cas, le procédé qui vient d'être décrit peut être avantageusement complété par un dépôt électrolytique d'argent complémentaire.At this stage of the process, it is possible that the electrical surface conductivity of the internal walls of the cavity needs to be improved. In this case, the process which has just been described can advantageously be supplemented by an electrolytic deposit of additional silver.

Le procédé qui vient d'être décrit n'est naturellement pas limité à la fabrication d'une cavité du type de celle représentée à la figure 1 et de nombreuses variantes de réalisation sont également possibles, notamment, grâce au procédé selon l'invention on peut obtenir par brasage en une ou plusieurs opérations, l'assemblage de plusieurs cavités mises bout à bout, pour constituer, par exemple, un filtre hyperfréquence du type de celui représenté à la figure 2.The process which has just been described is naturally not limited to the manufacture of a cavity of the type shown in FIG. 1 and numerous variant embodiments are also possible, in particular, thanks to the process according to the invention, can be obtained by soldering in one or more operations, the assembly of several cavities placed end to end, to constitute, for example, a microwave filter of the type shown in FIG. 2.

Le filtre de la figure 2 est constitué par deux cavités mises bout à bout. Une première cavité comprend les mêmes éléments que la cavité de la figure 1, repérés par les mêmes repères 1 à 4 et la deuxième cavité est constituée par un tronçon 12 dont une extrémité est placée en contact avec le couvercle 3 de la première cavité et dont l'autre extrémité est fermée par un couvercle 13 percé en son centre par un iris 14. Comme pour la cavité de la figure 1 les éléments du filtre sont fabriqués isolément puis assemblés par soudures de billes telles que les billes 8 à 11 et de 16 à 18 représentées sur la figure 2. Egalement, bien que le mode de préassemblage qui vient d'être décrit supprime l'emploi d'outillages compliqués que l'on pourrait utiliser pour préassembler les pièces élémentaires avant l'opération de brasage, il faut comprendre que ce mode de préassemblage n'exclut pas l'emploi d'autres outillages. En particulier, dans des variantes de réalisation on pourra utiliser à la place de billes tous autres objets de formes quelconques, pouvant remplacer avantageusement les billes, pour maintenir les pièces élémentaires entre elles pendant l'opération de brasage et à la limite procéder dans certains cas à une soudure par points directe des éléments adjacents assemblés sans utiliser d'objets en acier intermédiaires.The filter of Figure 2 consists of two cavities placed end to end. A first cavity comprises the same elements as the cavity in FIG. 1, identified by the same references 1 to 4 and the second cavity is constituted by a section 12 of which one end is placed in contact with the cover 3 of the first cavity and whose the other end is closed by a cover 13 pierced in its center by an iris 14. As for the cavity in FIG. 1, the elements of the filter are produced in isolation and then assembled by ball welds such as balls 8 to 11 and 16 to 18 shown in Figure 2. Also, although the method of pre-assembly which has just been described eliminates the use of complicated tools that could be used to pre-assemble the elementary parts before the brazing operation, it is necessary understand that this method of pre-assembly does not exclude the use of other tools. In particular, in alternative embodiments, other objects of any shape may be used instead of balls, which can advantageously replace the balls, to hold the elementary parts together during the brazing operation and, in certain cases, proceed in certain cases. to a direct spot weld of the adjacent joined elements without using intermediate steel objects.

Claims (10)

1. A process for the manufacture of a microwave cavity according to which the various components (1, 2, 3, 4) of the cavity are preshaped prior to their assembly, the preshaped components are then covered (5, 6, 7) by at least one metal layer of a high electric conductivity, these different components are then positioned to form the cavity, then the components are secured to one another by melting and then cooling the deposited metal covering said components (1, 2, 3) of the cavity, the melting of the deposited metal taking place in a single operation in a furnace raised to the melting temperature, characterized in that the adjacent components (1, 2; 1, 3) constituting the cavity are maintained in position before and during the melting operation by welding metal objects (8, 9, 10, 11) thereon, of a small size compared with the cavity components and which are brought into contact with the adjacent components.
2. A process according to claim 1, characterized in that the welding of a metal object (8, 9, 10, 11) against the adjacent components (1, 2; 1, 3) takes place by performing an electrical discharge between the metal object and the adjacent components to be secured to one another.
3. A process according to any one of claims 1 and 2, characterized in that the metal objects (8, 9, 10, 11) are constituted by steel balls.
4. A process according to any one of claims 1 to 3, characterized in that the preshaped components (1, 2, 3) of the cavity are machined from iron-nickel alloy sheets having a very low expansion coefficient.
5. A process according to any one of claims 1 to 4, characterized in that the metal layer (5, 6, 7) covering the components of the cavity is made by successively depositing copper and silver layers.
6. A process according to claim 5, characterized in that the thickness of the metal layer exceeds at least 5µm.
7. A microwave cavity realized according to the process according to one of the preceding claims, characterized in that the faces of the metal plates in contact with the ends of the section (1) have surfaces differing from those of the end sections, which are respectively in contact with the section (1), in order to enable each metal object (8, 9, 10, 11) to abut in the angle formed by the metal plates (2, 3) and the end portions of the section (1) with which said plates come into contact.
8. A microwave cavity according to claim 7, characterized in that the metal objects (8, 9, 10, 11) are ball-shaped.
9. A microwave cavity according to any one of claims 7 and 8, characterized in that the plates and the section are obtained by machining an iron-nickel sheet with a thickness roughly equal to 4/10 millimetres.
10. A microwave filter, characterized in that it comprises several cavities of the type claimed according to any one of claims 7 to 9, placed end-to-end.
EP84400297A 1983-02-25 1984-02-14 Manufacturing method of a microwave cavity, and cavity obtained thereby Expired EP0117804B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8303126 1983-02-25
FR8303126A FR2541826B1 (en) 1983-02-25 1983-02-25 PROCESS FOR MANUFACTURING A MICROWAVE CAVITY AND CAVITY OBTAINED THEREBY

Publications (2)

Publication Number Publication Date
EP0117804A1 EP0117804A1 (en) 1984-09-05
EP0117804B1 true EP0117804B1 (en) 1989-03-22

Family

ID=9286271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400297A Expired EP0117804B1 (en) 1983-02-25 1984-02-14 Manufacturing method of a microwave cavity, and cavity obtained thereby

Country Status (6)

Country Link
US (1) US4578658A (en)
EP (1) EP0117804B1 (en)
JP (1) JPS59163901A (en)
CA (1) CA1216332A (en)
DE (1) DE3477449D1 (en)
FR (1) FR2541826B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5151332A (en) * 1986-11-10 1992-09-29 Hazeltine Corporation Aluminum sheets bonded with cadmium
US5044546A (en) * 1986-11-10 1991-09-03 Hazeltine Corporation Process for bonding aluminum sheets with cadmium and product thereof
JPH0412570U (en) * 1990-05-18 1992-01-31
DE19642673A1 (en) * 1996-10-16 1998-04-23 Widia Gmbh Microwave oven and components therefor
EP0924791B1 (en) * 1997-12-16 2004-03-03 Spinner GmbH Elektrotechnische Fabrik Bandpass filter
US6727787B2 (en) * 2000-12-21 2004-04-27 The Charles Stark Draper Laboratory, Inc. Method and device for achieving a high-Q microwave resonant cavity

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981908A (en) * 1958-12-15 1961-04-25 Jr Moody C Thompson Cavity resonator
US3157847A (en) * 1961-07-11 1964-11-17 Robert M Williams Multilayered waveguide circuitry formed by stacking plates having surface grooves
DE1590530B1 (en) * 1963-10-26 1971-10-07 Kuhn Hans Dipl Phys METHOD FOR MANUFACTURING MICROWAVE COMPONENTS
US3529267A (en) * 1967-10-20 1970-09-15 Corning Glass Works Microwave cavity resonator using coated fused silica or glass ceramic
JPS509784A (en) * 1973-06-01 1975-01-31
HU172698B (en) * 1976-09-30 1978-11-28 Finommech Vallalat Method for interconnecting current-carrying elements of a microwave apparatus and by means of this making the apparatus
US4260967A (en) * 1979-03-26 1981-04-07 Communications Satellite Corporation High power waveguide filter

Also Published As

Publication number Publication date
FR2541826B1 (en) 1985-07-05
JPS59163901A (en) 1984-09-17
JPH0223082B2 (en) 1990-05-22
CA1216332A (en) 1987-01-06
US4578658A (en) 1986-03-25
EP0117804A1 (en) 1984-09-05
DE3477449D1 (en) 1989-04-27
FR2541826A1 (en) 1984-08-31

Similar Documents

Publication Publication Date Title
FR2549296A1 (en) METHOD FOR MANUFACTURING A SOLAR CELL
EP0007873B1 (en) Method for soldering a light-emitting semiconductor onto a metallic base
FR2831714A1 (en) Photovoltaic cell assembly with cells arranged on glass substrates and connected by bonding conductors and interconnection elements with a joint forming a sealed volume enclosing the cells
EP0803949B1 (en) Laser diode device
FR2723633A1 (en) SANDWICH HONEYCOMB PANEL CONTAINING INTEGRATED HEAT TUBES
FR2641646A1 (en) SOLAR CELL AND MANUFACTURING METHOD THEREOF
EP1586122B1 (en) Photovoltaic module comprising external connector pins
EP0117804B1 (en) Manufacturing method of a microwave cavity, and cavity obtained thereby
EP2919939B1 (en) Aluminium/copper heterogeneous welding
EP1459347B1 (en) Vacuum tube and method of manufacturing thereof
EP2122728A1 (en) Bipolar plate for a fuel cell with a polymer membrane
WO2017157794A1 (en) Method for welding a conductive element to a battery terminal
FR2508233A1 (en) METHOD FOR PRODUCING A UNIT COMPONENT COMPRISING AN OSCILLATOR DIODE AND A VARIABLE CAPACITY DIODE AND FREQUENCY-ACCORDABLE TRANSMITTER COMPRISING SUCH A UNIT COMPONENT
WO2002078088A1 (en) Method for assembling components of different thicknesses
EP1889342A2 (en) Stack of laser diodes forming a laser device
FR2460035A1 (en) ELECTRONIC GUN FOR CATHODE RAY TUBES AND ITS MANUFACTURING METHOD
FR2499282A1 (en) MAGNETIC HEAD COMPRISING SELF-ADDED STITCHED SLABS
FR2724495A1 (en) BATTERY OF LASER DIODE BARS, AND METHOD OF ASSEMBLING THE SAME
FR3056856B1 (en) THERMOELECTRIC ELEMENT, MODULE AND GENERATOR FOR A THERMAL MOTOR VEHICLE AND METHOD OF MANUFACTURING THE MODULE
FR2474239A1 (en) ELECTRONIC LENSES FOR ELECTRON CANNONS, ESPECIALLY FOR TELEVISION IMAGE TUBES
FR2867608A1 (en) Heat sink for e.g. triac, has body with openings traversed axially by tubes, where each tube is separated from body by insulation layer constituted of powder compressed with good electrical insulating and heat conducting material
FR3139742A1 (en) Spot welding process
FR3139662A1 (en) Fuse
EP0237801A1 (en) Laser with at least one impervious joint
FR2751472A1 (en) Out-of-phase channel for array for microwave antenna e.g. for sweep antenna

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT

17P Request for examination filed

Effective date: 19850226

17Q First examination report despatched

Effective date: 19861202

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALCATEL ESPACE SOCIETE ANONYME DITE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT

REF Corresponds to:

Ref document number: 3477449

Country of ref document: DE

Date of ref document: 19890427

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980112

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980123

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990214

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991201