EP0117804B1 - Procédé de fabrication d'une cavité hyperfréquence, et cavité obtenue par ce procédé - Google Patents

Procédé de fabrication d'une cavité hyperfréquence, et cavité obtenue par ce procédé Download PDF

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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)
English (en)
French (fr)
Other versions
EP0117804A1 (fr
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/fr
Application granted granted Critical
Publication of EP0117804B1 publication Critical patent/EP0117804B1/fr
Expired legal-status Critical Current

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP84400297A 1983-02-25 1984-02-14 Procédé de fabrication d'une cavité hyperfréquence, et cavité obtenue par ce procédé Expired EP0117804B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8303126A FR2541826B1 (fr) 1983-02-25 1983-02-25 Procede de fabrication d'une cavite hyperfrequence et cavite obtenue par ce procede
FR8303126 1983-02-25

Publications (2)

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

Family

ID=9286271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400297A Expired EP0117804B1 (fr) 1983-02-25 1984-02-14 Procédé de fabrication d'une cavité hyperfréquence, et cavité obtenue par ce procédé

Country Status (6)

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

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 (enrdf_load_stackoverflow) * 1990-05-18 1992-01-31
DE19642673A1 (de) * 1996-10-16 1998-04-23 Widia Gmbh Mikrowellenofen und Bauteile hierfür
ATE261194T1 (de) * 1997-12-16 2004-03-15 Spinner Gmbh Elektrotech Bandpassfilter
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 (de) * 1963-10-26 1971-10-07 Kuhn Hans Dipl Phys Verfahren zur herstellung von mikrowellenbauteilen
US3529267A (en) * 1967-10-20 1970-09-15 Corning Glass Works Microwave cavity resonator using coated fused silica or glass ceramic
JPS509784A (enrdf_load_stackoverflow) * 1973-06-01 1975-01-31
HU172698B (hu) * 1976-09-30 1978-11-28 Finommech Vallalat Sposob dlja prisoedinenija tokoprovodjahhikh ehlementov sbornoj chasti i pri pomohhi ehtogo dlja izgotovlenija sbornoj chasti
US4260967A (en) * 1979-03-26 1981-04-07 Communications Satellite Corporation High power waveguide filter

Also Published As

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

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