EP0035440B1 - Dispositif d'accord en hyperfréquences, du type à contacts glissants - Google Patents

Dispositif d'accord en hyperfréquences, du type à contacts glissants Download PDF

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Publication number
EP0035440B1
EP0035440B1 EP81400287A EP81400287A EP0035440B1 EP 0035440 B1 EP0035440 B1 EP 0035440B1 EP 81400287 A EP81400287 A EP 81400287A EP 81400287 A EP81400287 A EP 81400287A EP 0035440 B1 EP0035440 B1 EP 0035440B1
Authority
EP
European Patent Office
Prior art keywords
cavity
rod
tuning device
sliding
laminae
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
EP81400287A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0035440A1 (fr
Inventor
Jean-Claude Curtinot
Xavier Delestre
Jean Fouillet
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.)
Thales SA
Original Assignee
Thomson CSF 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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0035440A1 publication Critical patent/EP0035440A1/fr
Application granted granted Critical
Publication of EP0035440B1 publication Critical patent/EP0035440B1/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
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • the present invention relates to a microwave tuning device comprising a part fixed relative to the wall of a cavity and a movable part sliding inside the fixed part so as to be able to penetrate more or less deeply into the cavity; good quality electrical contact between the fixed part and the moving part must ensure the passage of surface currents between these two parts.
  • Such devices are known, for example from patent US 25 56 607, in which elastic blades integral with one of the parts ensure sliding contact with the other part. These blades are made of materials with good elasticity but are therefore hard, fragile, abrasive and poorly conduct electricity. To remedy these defects, it is known to cover these elastic strips with a deposit of silver or gold produced by electrolysis, which constitutes a good conductor of the microwave currents which are surface currents. Since the moving part, for reasons of mechanical rigidity, must be made of a metal whose hardness is greater than that of silver or gold, the repeated movements of the moving part inside the fixed part, due to friction, lead to a rapid deterioration of the surface condition, that is to say the deposit of silver or gold.
  • the object of the present invention is to ensure good electrical contact between the fixed part and the mobile part of the device, even when the mobile part is moving.
  • a microwave tuning device as described in claim 1 attached, achieves this goal. It is a tuning device comprising a movable cylindrical rod having a sliding surface and a hollow cylindrical part, fixed to a wall of a cavity, which it crosses, and completed, towards its end situated in the cavity, by n elastic parts (n integer at least equal to 2) and inside which the rod slides, crossing it right through to penetrate an adjustable length into the cavity, the elastic parts pressing on the surface sliding contacts;
  • n longitudinal slots are formed in the end of the cylindrical part located in the cavity and in that the elastic parts comprise: the n blades of the cylindrical part comprised between the n slots and n added parts constituting jaws, of metal which is a good conductor of electricity, associated respectively with the n blades and forming the contacts.
  • the advantages provided by the tuning device according to the invention mainly consist in a better functioning and a longer life of the equipment.
  • Fig. 1 is a partial view, in section, of an “frequency agile” filter.
  • Fig. 1 shows the wall 1 of a cavity. This wall is pierced with a cylindrical hole, 11 mm in diameter, into which is fitted a tuning device; this tuning device comprises a hollow cylindrical part 2, forming a clamp; inside this clamp slides a cylindrical rod, solid, 3, made of brass.
  • the clamp 2 has a cylindrical head, 20, with an outside diameter of 20 mm, outside the cavity, a middle part 21 of the diameter of the hole drilled in the wall of the cavity and an end part 22 consisting of a cylinder with an outside diameter of 9 mm. . While the head 20 and the middle part 21 have a large wall thickness, the end part 22 is a hollow cylinder with a thin wall, which is split longitudinally over a length AB, according to four parallel slots, at 90 ° from each other ; the clamp 2 is made of beryllium bronze and, thanks to a treatment which will be described later, the four blades determined by the four slots are made elastic.
  • inserts such as 40, 41, are interposed between the elastic blades and the rod 3; these inserts, produced in silver, probes integral with the elastic blades and come into contact with the rod 3.
  • the clamp 2 is stuffed as follows.
  • a beryllium bronze blank is produced which is taken up mechanically to achieve the desired dimensions, in particular as regards the outside diameter of the middle part.
  • a silver ring is made integral, by brazing, with the free end of the terminal part 22 of the clamp 2.
  • the terminal part is then sawn using a very fine milling cutter giving a slot width of 3/10 8 millimeter.
  • a conformator constituted by a cylindrical centering axis with a diameter of 1.6 mm, is introduced into the hole of the split ring where the rod 3 will slide. It should be noted that the diameter of this conformator is slightly less than the diameter of the part of the rod 3 which will slide in the clamp 2 so as to ensure, thereafter, a good tightening of the rod between the ends of the clamp.
  • a strapping made using a metal strip, keeps the ends of the clamp 2 in contact with the shaping device.
  • the assembly constituted by the clamp 2, the conformator and the strapping band is introduced for two hours into an enclosure at 320 ° C; this conventional heat treatment is intended to give the blades of the clamp 2 the desired elasticity.
  • the forceps are then covered, by electrolysis, with a silver deposit with a thickness of 7 microns.
  • the clamp does not risk, by rapid wear at the level of the sliding contacts, to cause the disabling of the tuning device.
  • the admissible wear at the level of the contacts is no longer a few microns as with conventional devices where, under the few microns of thickness of the electrolytic deposit of silver, wear shows at the end of the clamp in contact with the rod, a bad conductive metal; this allowable wear is now a few tenths of a millimeter.
  • the wear of the silver of the added parts, such as 40, 41, on the brass of the rod 3 performs a lapping of the tuning device and therefore improves its operation; on the contrary in conventional devices having no attachments, the wear of the silver, which is only there in the form of a thin electrolytic deposit, tends to form chips which are detrimental to the proper functioning of the device.
  • Fig. 2 is a sectional view along XX (see fig. 1) of the tuning device. This view shows the movable rod 3 which, by the I of the four stic blades, marked 25 to 28, constituting the end 22 of the clamp, is clamped between the jaws of the clamp. These jaws are formed by the four sections of the split ring which were discussed during the description of FIG. 1; they are designated by the references 40 to 43 in FIG. 2.
  • the insert (40, 41 in FIG. 1), making contact can be produced not only in silver but in any other metal or alloy which is a good conductor of electricity and relatively malleable so as to be able to wearing out, matching the shape of the sliding surface against which it comes into contact; this is the break-in that was discussed earlier.
  • this insert is of dimensions clearly greater than the surface of the sliding contact which it must provide, it is possible to produce it by assembling two metal parts: a metal part which is good conductor of surface currents and relatively malleable, at the place of sliding contact, and another metal part for which the choice of metal no longer has to be guided by considerations of electrical conductivity.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
EP81400287A 1980-03-05 1981-02-24 Dispositif d'accord en hyperfréquences, du type à contacts glissants Expired EP0035440B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8004949 1980-03-05
FR8004949A FR2477782A1 (fr) 1980-03-05 1980-03-05 Dispositif d'accord en hyperfrequences, du type a contacts glissants, et filtre comportant un tel dispositif

Publications (2)

Publication Number Publication Date
EP0035440A1 EP0035440A1 (fr) 1981-09-09
EP0035440B1 true EP0035440B1 (fr) 1984-05-16

Family

ID=9239343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400287A Expired EP0035440B1 (fr) 1980-03-05 1981-02-24 Dispositif d'accord en hyperfréquences, du type à contacts glissants

Country Status (5)

Country Link
US (1) US4376923A (OSRAM)
EP (1) EP0035440B1 (OSRAM)
JP (1) JPS56136002A (OSRAM)
DE (1) DE3163570D1 (OSRAM)
FR (1) FR2477782A1 (OSRAM)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8323143D0 (en) * 1983-08-27 1983-09-28 Oxley R F Tuning screw
FI89115C (fi) * 1991-09-18 1993-08-10 Lk Products Oy Foerfarande foer faestandet av en resonatorstav mot ett hoegfrekvensfilters vaegg och hoegfrekvensfilter
GB2308235B (en) * 1995-12-12 1999-11-24 Eev Ltd High frequency apparatus
DE19707153A1 (de) * 1997-02-22 1998-08-27 Philips Patentverwaltung Mikrowellen-Bauelement
US6104263A (en) * 1997-05-28 2000-08-15 Hewlett-Packard Company Capacitive tuning screw having a compressible tip
US8269582B2 (en) * 2009-10-30 2012-09-18 Alcatel Lucent Tuning element assembly and method for RF components
FI3621145T3 (fi) * 2017-05-02 2024-10-03 Kmw Inc Ontelorakenteinen radiotaajuussuodatin

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556607A (en) * 1946-07-27 1951-06-12 Hazeltine Research Inc Wave-signal translating arrangement
US2561727A (en) * 1943-07-07 1951-07-24 Harold G Cooper Tuning of electrical resonators
US2790151A (en) * 1952-01-05 1957-04-23 Henry J Riblet Temperature compensated cavity resonator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280996B (de) * 1967-07-14 1968-10-24 Telefunken Patent Abstimmvorrichtung fuer den Hohlraum eines Mikrowellenbauteils

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561727A (en) * 1943-07-07 1951-07-24 Harold G Cooper Tuning of electrical resonators
US2556607A (en) * 1946-07-27 1951-06-12 Hazeltine Research Inc Wave-signal translating arrangement
US2790151A (en) * 1952-01-05 1957-04-23 Henry J Riblet Temperature compensated cavity resonator

Also Published As

Publication number Publication date
JPS6153887B2 (OSRAM) 1986-11-19
JPS56136002A (en) 1981-10-23
EP0035440A1 (fr) 1981-09-09
DE3163570D1 (en) 1984-06-20
US4376923A (en) 1983-03-15
FR2477782A1 (fr) 1981-09-11
FR2477782B1 (OSRAM) 1983-12-23

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