EP0046098B2 - Résonateur accordable et circuit hyperfréquence comportant au moins un tel résonateur - Google Patents

Résonateur accordable et circuit hyperfréquence comportant au moins un tel résonateur Download PDF

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Publication number
EP0046098B2
EP0046098B2 EP81401184A EP81401184A EP0046098B2 EP 0046098 B2 EP0046098 B2 EP 0046098B2 EP 81401184 A EP81401184 A EP 81401184A EP 81401184 A EP81401184 A EP 81401184A EP 0046098 B2 EP0046098 B2 EP 0046098B2
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EP
European Patent Office
Prior art keywords
cavity
finger
resonator
diver
inwards directed
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 - Lifetime
Application number
EP81401184A
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German (de)
English (en)
French (fr)
Other versions
EP0046098A1 (fr
EP0046098B1 (fr
Inventor
Jean Fouillet
Jean-Claude Cruchon
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 Thomson Faisceaux Hertziens SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
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Application filed by Alcatel Thomson Faisceaux Hertziens SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
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    • 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 invention relates to microwave circuits and more particularly to a tunable resonator usable in such circuits, tunable microwave filters or microwave waveguides.
  • the tunable coaxial resonators currently used to make tunable microwave filters generally consist of a hollow metal finger forming a clamp, fixed relative to the wall of the filter or of the guide in which it is placed, and of a metal finger movable at the 'interior of this hollow finger, which allows to achieve the desired agreement by varying the total length of the finger in the guide.
  • US-P-4,207,548 describes a tunable resonator in which the variation in tuning frequency is obtained by variation in length of a plunger sliding in a tubular conductor by means of a rod placed inside the plunger .
  • the external surface of the plunger and the internal surface of the conductor are kept spaced apart, pieces of PFTE (Teflon) for example allowing the spacing to be maintained.
  • PFTE Teflon
  • the problem to be solved is therefore to produce a simple resonator, tunable by variation of the length of a metal finger plunging into a cavity or a guide, the mechanical and electrical characteristics of which do not deteriorate over time and the electrical characteristics of which are stable and reproducible across the entire tuning range; this resonator can be used in tunable circuits, filters or guide susceptances and does not have the above-mentioned drawbacks.
  • a resonator of the ⁇ / 4 type, tunable in a large frequency range, comprising a first resonant cavity provided with a reentrant hollow finger fixed relative to a wall and arranged along the axis (XX ') of said cavity, and a movable plunger inside the finger, capable of extending the reentrant finger to allow adjustment of the tuning frequency of said resonator; said metal plunger being electrically isolated from the reentrant metal finger by a dielectric spacer, having a permittivity less than 4, facilitating sliding between the two; this plunger forming with the reentrant finger an internal coaxial line of low impedance (Z3); an actuator element (4) being provided to allow adjustment of the insertion of the plunger by sliding and the resonator comprising a second cavity, the actuator element forming with this second cavity, in which it slides, a coaxial line of high impedance ( Z4), and having at the bottom of the crossing of the wall of the second cavity
  • FIG. 1 is the diagram of an embodiment of the tunable coaxial resonator according to the invention.
  • FIG. 2 represents the equivalent electrical diagram of the tunable coaxial resonator shown in FIG. 1.
  • FIG. 1 shows a resonator, the structure of which is that of a reentrant coaxial cavity, that is to say which comprises a circular or rectangular section cavity, of axis XX, 1, comprising a reentrant finger 2 of the same axis as the cavity 1.
  • a mobile plunger 3 is capable of extending the reentrant finger 2 when it is pushed by means of a pusher 4 sliding in a cavity 6, the reentrant finger 2 being hollow.
  • This plunger is a metal plunger, but the sliding of the plunger in the reentrant finger is ensured by an intermediate layer 5 made of a low loss dielectric material forming insulation between the finger 2 and the plunger 3.
  • This intermediate layer 5 is, in the embodiment shown in FIG. 1, a layer which coats the metallic plunger 3.
  • This layer may consist of an organic dielectric material deposited by projection or of a glued dielectric sheet. This layer can also be a glued sheet of paper or a simple layer of glue.
  • the material chosen to constitute the intermediate layer must be depositable in a thin layer adhering to the metal forming the plunger (or the fixed finger) to form a layer of 1 / 100 e to 1 / 10 e of mm.
  • the material must have a fairly low permittivity ( ⁇ r ⁇ 4) and introduce only low losses (low tg ⁇ ).
  • the length of the line moves away from the theoretical length ⁇ 4 during the variation of position of the plunger, ⁇ being the wavelength used, and the TOS of the line then varies with the tuning frequency.
  • polytetrafluorethylene Teflon
  • polyester Mylar type
  • materials such as epoxy resins, silicones.
  • the intermediate layer may, instead of covering the plunger, cover the internal wall of the hollow reentrant finger, by lining.
  • this intermediate layer avoids the localized metal-metal electrical contact previously existing in the tunable resonators between the reentrant finger and the movable plunger: it appreciably increases the overvoltage coefficient Q of the resonator, because the short-circuit at the end of the line is better reduced by this better termination.
  • This layer also makes it possible, by avoiding seizure due to direct mechanical contact between the hollow reentrant finger and the movable plunger, to significantly increase the longevity of the circuits using such resonators.
  • this layer makes it easier to make the agreement by giving better reproducibility at the point of contact, due to the mechanical stability of the device.
  • This resonator structure makes it easy to produce adjustable, fixed or frequency tunable microwave filters, in TEM wave, under the cut-off.
  • an analogous filter produced with resonators using metal-to-metal clamp contacts allows only an overvoltage coefficient of the order of 1500 to 1600 to be obtained.
  • the high frequency of the tuning range is given when the plunger is flush with the end of the hollow finger and the frequency decreases when the plunging of the plunger into the cavity increases.
  • the equivalent electrical diagram of the resonator shown in Figure 1 is shown in Figure 2.
  • the cavity 1 and the reentrant finger 2 form a coaxial line of fixed length, closed by a fixed short circuit formed by the ring 10. This line has an impedance Z1.
  • the cavity 1 and the metal plunger 3, in its part extending the reentrant finger 2 form a second coaxial line open at its end, of impedance Z2.
  • the length of this extension line being variable, the tuning frequency is variable.
  • the metal plunger 3 also forms with the reentrant finger 2, isolated from one another by the intermediate layer 5, a third coaxial line of very low impedance Z3.
  • a capacitance C1 due to the discontinuities between these three lines has also been shown on the electrical diagram.
  • the piston 4 provided for the adjustment of the depression of the plunger intervenes for its part in the following manner: it forms with the cavity in which it slides a fourth coaxial line of very high impedance Z4: a discontinuity capacity C2 representing the transition between the third line and this fourth coaxial line.
  • a discontinuity capacity C2 representing the transition between the third line and this fourth coaxial line.
  • the invention is not limited to the embodiments described in conjunction with the figures.
  • the resonator described has been in connection with a coaxial cavity of reentrant structure in order to produce tunable filters.
  • the same resonator can be used as a variable plunger in a guide to constitute a variable susceptance.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
EP81401184A 1980-07-29 1981-07-24 Résonateur accordable et circuit hyperfréquence comportant au moins un tel résonateur Expired - Lifetime EP0046098B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81401184T ATE29802T1 (de) 1980-07-29 1981-07-24 Abstimmbarer resonator und mikrowellenschaltung mit wenigstens einem solchen resonator.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8016709 1980-07-29
FR8016709A FR2488056A1 (fr) 1980-07-29 1980-07-29 Resonateur accordable et circuit hyperfrequence comportant au moins un tel resonateur

Publications (3)

Publication Number Publication Date
EP0046098A1 EP0046098A1 (fr) 1982-02-17
EP0046098B1 EP0046098B1 (fr) 1987-09-16
EP0046098B2 true EP0046098B2 (fr) 1993-12-29

Family

ID=9244660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401184A Expired - Lifetime EP0046098B2 (fr) 1980-07-29 1981-07-24 Résonateur accordable et circuit hyperfréquence comportant au moins un tel résonateur

Country Status (6)

Country Link
US (1) US4460878A (OSRAM)
EP (1) EP0046098B2 (OSRAM)
JP (1) JPS5753104A (OSRAM)
AT (1) ATE29802T1 (OSRAM)
DE (1) DE3176459D1 (OSRAM)
FR (1) FR2488056A1 (OSRAM)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570491B1 (fr) * 1984-09-14 1988-05-13 Centre Nat Rech Scient Capteur de mesure des variations d'une grandeur physique
US4752753A (en) * 1986-09-04 1988-06-21 Wavecom Coaxial waveguide band reject filter
JPH01170471A (ja) * 1987-12-25 1989-07-05 Terumo Corp 中空糸膜型血液処理器及び製造方法
US4933652A (en) * 1989-04-10 1990-06-12 Celwave Systems Inc. Tem coaxial resonator
US5808528A (en) * 1996-09-05 1998-09-15 Digital Microwave Corporation Broad-band tunable waveguide filter using etched septum discontinuities
DE19917087C2 (de) * 1999-04-15 2001-07-26 Kathrein Werke Kg Hochfrequenzfilter
US6407651B1 (en) 1999-12-06 2002-06-18 Kathrein, Inc., Scala Division Temperature compensated tunable resonant cavity
GB2456738B (en) * 2007-01-15 2011-08-10 Isotek Electronics Ltd TEM mode resonator
US9325044B2 (en) * 2013-01-26 2016-04-26 Nuvotronics, Inc. Multi-layer digital elliptic filter and method
DE102014001917A1 (de) 2014-02-13 2015-08-13 Kathrein-Werke Kg Hochfrequenzfilter in koaxialer Bauweise
JP5878589B2 (ja) * 2014-06-16 2016-03-08 日本電業工作株式会社 共振器及びフィルタ
DE102015008894A1 (de) 2015-07-09 2017-01-12 Kathrein-Werke Kg Gewindelose Abstimmelemente für Koaxialresonatoren und Verfahren zur Abstimmung derselben

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR958806A (OSRAM) * 1944-02-09 1950-03-21
FR1046593A (fr) * 1951-05-11 1953-12-08 Centre Nat Rech Scient Résonateur électromagnétique accordable sur ondes métriques et décimétriques et dispositifs utilisant ce résonateur
DE1061848B (de) * 1956-04-26 1959-07-23 Saba Gmbh Abstimmbarer Leitungsresonanzkreis in Form einer konzentrischen Doppelleitung
FR1261622A (fr) * 1959-06-30 1961-05-19 Siemens Ag Résonateur pour ondes électromagnétiques très courtes
US3293644A (en) * 1964-07-13 1966-12-20 Motorola Inc Wave trap system for duplex operation from a single antenna
FR1444203A (fr) * 1965-05-20 1966-07-01 Thomson Varian Perfectionnements apportés aux dispositifs d'accord des cavités d'un tube hyperfréquence du type klystron
JPS523478Y2 (OSRAM) * 1972-05-02 1977-01-25
CH575179A5 (en) * 1974-09-11 1976-04-30 Siemens Ag Albis Tuning and detuning mechanism for cavity resonator - conducting cylinder slides over fixed stem with insulating layer at interfaces
JPS5218045U (OSRAM) * 1975-07-16 1977-02-08
AU3500078A (en) * 1977-04-21 1979-10-18 Del Technology Ltd Coaxial resonator tuning

Also Published As

Publication number Publication date
JPS6324567B2 (OSRAM) 1988-05-21
FR2488056B1 (OSRAM) 1984-08-03
EP0046098A1 (fr) 1982-02-17
EP0046098B1 (fr) 1987-09-16
JPS5753104A (en) 1982-03-30
US4460878A (en) 1984-07-17
FR2488056A1 (fr) 1982-02-05
DE3176459D1 (en) 1987-10-22
ATE29802T1 (de) 1987-10-15

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