US2996690A - Temperature compensated cavity resonator - Google Patents

Temperature compensated cavity resonator Download PDF

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Publication number
US2996690A
US2996690A US730609A US73060958A US2996690A US 2996690 A US2996690 A US 2996690A US 730609 A US730609 A US 730609A US 73060958 A US73060958 A US 73060958A US 2996690 A US2996690 A US 2996690A
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United States
Prior art keywords
cavity resonator
section
expansion
temperature
main body
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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
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US730609A
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English (en)
Inventor
Clair Maurice W St
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Varian Medical Systems Inc
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Varian Associates Inc
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Filing date
Publication date
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Priority to US730609A priority Critical patent/US2996690A/en
Priority to GB10715/59A priority patent/GB866246A/en
Priority to DEV16408A priority patent/DE1167403B/de
Priority to FR793052A priority patent/FR1224416A/fr
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Publication of US2996690A publication Critical patent/US2996690A/en
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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
    • H01P7/06—Cavity resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/02—Tubes with electron stream modulated in velocity or density in a modulator zone and thereafter giving up energy in an inducing zone, the zones being associated with one or more resonators
    • H01J25/22—Reflex klystrons, i.e. tubes having one or more resonators, with a single reflection of the electron stream, and in which the stream is modulated mainly by velocity in the modulator zone
    • H01J25/24—Reflex klystrons, i.e. tubes having one or more resonators, with a single reflection of the electron stream, and in which the stream is modulated mainly by velocity in the modulator zone in which the electron stream is in the axis of the resonator or resonators and is pencil-like before reflection

Definitions

  • cavity resonators or stalos of the present type be tunable over a range of resonant frequencies and, once tuned, that they remain fixed in dimension during use so that their resonance frequency will not change.
  • these cavity resonators undergo a wide range of operating temperatures and are constantly changing in dimensions due to expansion and contraction of their structural parts.
  • Various temperature compensating schemes have been utilized in the past to maintain the cavity resonator frequency constant over a range of operating temperatures. It is the main object of the present invention to provide a cavity resonator incorporating novel, improved tuning apparatus and temperature compensation features.
  • One feature of the present invention is the provision of a novel cavity resonator constructed of parts made of materials having different coefiicients of expansion and so interrelated that at least one of the main structural walls of the cavity resonator will move in variable accordance with the temperature changes of the cavity resonator to maintain a fixed operating frequency; or some predetermined fixed temperature coefiicient of frequency different from zero, if desired.
  • An other feature of the present invention is the provision of a novel cavity resonator construction of the above featured type wherein the one end wall of the cavity resonator is circular and is mounted at its periphery on a rim made of a metal of diiferent coefficient of expansion, the end wall and rim being so formed and dimensioned that radial expansion of the wall results in an axial movement of the wall due to its interaction with the rim material.
  • Still another feature of the present invention is the provision of a cavity resonator incorporating a novel tuning plate construction for selectively changing the dimensions of the cavity resonator.
  • FIG. 1 is an elevation view of a cavity resonator which embodies the present invention mounted on a klystron oscillator for stabilization purposes,
  • FIG. 2 is a longitudinal cross-section view of the cavity resonator taken along section line 2-2 of FIG. 1,
  • FIG. 3 is a cross-section view of the tuner mechanism taken along section line 3-3 in FIG. 2,
  • FIG. 4 is an enlarged cross-section view of a portion of one side Wall taken along section line 44 in FIG. 2
  • FIG. 5 is a modification of the structure shown in FIG. 4, and
  • a locking screw 27 is welded to the tuner plate 23 and extends up within the hollow tuner screw member 26, the screw 27 being provided with a lock nut 28 and washer 29 adapted to engage a ledge 31 on the tuner screw member 26.
  • the plate 23 may be moved inwardly into the cavity resonator by screwing the tuner member 26 into the extension 22.
  • the screw 26 is locked by means of lock nut 32.
  • the plate 23 is pulled up firmly against the inner end of the tuner screw 26 by tightening lock nut 28 down on screw 27.
  • the lip 25 serves to limit the distance that tuner screw 26 can be moved into the cavity resonator to therefore prevent overstretching the bellows 24.
  • the same end plate 18 is constructed in a novel manner to provide temperature compensation for this cavity resonator.
  • the large central portion 33 of this end plate (including the above described tuner mechanism) is made of steel or other high expansion material and is brazed to an outer rim or ring portion 34 which is of a material such as Invar having a very low thermal coefiioient of expansion relative to the material of the central portion 33.
  • the central portion 33 is provided with a peripheral section 35 joined to the central or main section 33 at a relatively thin annular junction point 36 (FIG. 4). It is noted that the tuner structure shown in the plate 18 in FIG. 2 has been omitted in FIGS. 4 and 5 for the purpose of giving a clearer picture of the temperature compensation feature.
  • the annular Invar ring 34 also has an inner circumferal section 37 which is joined to the main section of the Invar ring at a relatively thin junction point 38.
  • the upper surface 40 of the peripheral section 35 is directed at an angle relative to the axis line 39 and mates with the end surface of the circumferal section 37 which extends at the same angle, these two surfaces being securely brazed together. The reason for this angular mating surface 40 will be described in more detail below.
  • the Invar ring 34 and main body 11 to which the ring 34 is secured have a relatively slight expansion over the temperature range of operation of the cavity resonator due to the low coefficient of expansion of Invar. Therefore the junction point 38 remains substantially stationary in the radial direction and in the axial direction relative to the axis 39 during all temperatures of operation.
  • the steel central portion 33 has a relatively high thermal coeflicient of expansion and it expands radially from the central axis 39 a relatively large distance as well as inwardly into the cavity resonator.
  • the junction point 36 moves radially outward from the axis 39 and axially inward into the cavity resonator with temperature expansion and vice versa with temperature contraction.
  • the point 38 may be shifted relative to the point 36 by shaving the surface 46 (see FIG. 5) and thus decreasing the angle 0.

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US730609A 1958-04-24 1958-04-24 Temperature compensated cavity resonator Expired - Lifetime US2996690A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US730609A US2996690A (en) 1958-04-24 1958-04-24 Temperature compensated cavity resonator
GB10715/59A GB866246A (en) 1958-04-24 1959-03-26 Temperature compensated cavity resonator
DEV16408A DE1167403B (de) 1958-04-24 1959-04-20 Temperaturkompensierter Hohlraumresonator
FR793052A FR1224416A (fr) 1958-04-24 1959-04-24 Cavité résonnante à compensation thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US730609A US2996690A (en) 1958-04-24 1958-04-24 Temperature compensated cavity resonator

Publications (1)

Publication Number Publication Date
US2996690A true US2996690A (en) 1961-08-15

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Family Applications (1)

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US730609A Expired - Lifetime US2996690A (en) 1958-04-24 1958-04-24 Temperature compensated cavity resonator

Country Status (4)

Country Link
US (1) US2996690A (de)
DE (1) DE1167403B (de)
FR (1) FR1224416A (de)
GB (1) GB866246A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202944A (en) * 1962-04-09 1965-08-24 Varian Associates Cavity resonator apparatus
US3381168A (en) * 1964-12-01 1968-04-30 Westinghouse Electric Corp Frequency stable coaxial magnetron utilizing low coefficient of thermal expansion material
US3541479A (en) * 1968-01-17 1970-11-17 Webb James E Tuning arrangement for an electron discharge device or the like
US3626336A (en) * 1970-04-13 1971-12-07 Varian Associates Heat dissipating structure for cavity resonator tuning actuator
US4260967A (en) * 1979-03-26 1981-04-07 Communications Satellite Corporation High power waveguide filter
US5329255A (en) * 1992-09-04 1994-07-12 Trw Inc. Thermally compensating microwave cavity

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486129A (en) * 1949-10-25 Temperature compensating
US2495744A (en) * 1945-11-01 1950-01-31 Charles V Litton Reactance tuning device
US2507426A (en) * 1944-05-03 1950-05-09 Automatic Elect Lab Electrical resonator
US2752576A (en) * 1955-05-23 1956-06-26 Bomac Lab Inc Tuning mechanism for reference cavity resonators
US2880357A (en) * 1955-10-21 1959-03-31 Varian Associates Electron cavity resonator tube apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB579834A (en) * 1943-11-20 1946-08-16 Norman Charles Barford Improvements in or relating to the tuning of hollow electrical resonators
US2445282A (en) * 1944-05-19 1948-07-13 Bell Telephone Labor Inc Tuning arrangement for cavity resonators
US2501728A (en) * 1944-05-25 1950-03-28 Us Navy Tuning mechanism for resonant cavities and the like
US2600225A (en) * 1946-03-29 1952-06-10 Albert D Ehrenfried Temperature compensated resonant cavity
FR1006613A (fr) * 1948-02-07 1952-04-25 Onera (Off Nat Aerospatiale) Perfectionnements apportés aux dispositifs du genre des cavités ou volumes résonnants
GB790535A (en) * 1955-04-07 1958-02-12 Csf Improvements in mechanical triggering devices for electric circuits

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486129A (en) * 1949-10-25 Temperature compensating
US2507426A (en) * 1944-05-03 1950-05-09 Automatic Elect Lab Electrical resonator
US2495744A (en) * 1945-11-01 1950-01-31 Charles V Litton Reactance tuning device
US2752576A (en) * 1955-05-23 1956-06-26 Bomac Lab Inc Tuning mechanism for reference cavity resonators
US2880357A (en) * 1955-10-21 1959-03-31 Varian Associates Electron cavity resonator tube apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202944A (en) * 1962-04-09 1965-08-24 Varian Associates Cavity resonator apparatus
US3381168A (en) * 1964-12-01 1968-04-30 Westinghouse Electric Corp Frequency stable coaxial magnetron utilizing low coefficient of thermal expansion material
US3541479A (en) * 1968-01-17 1970-11-17 Webb James E Tuning arrangement for an electron discharge device or the like
US3626336A (en) * 1970-04-13 1971-12-07 Varian Associates Heat dissipating structure for cavity resonator tuning actuator
US4260967A (en) * 1979-03-26 1981-04-07 Communications Satellite Corporation High power waveguide filter
US5329255A (en) * 1992-09-04 1994-07-12 Trw Inc. Thermally compensating microwave cavity

Also Published As

Publication number Publication date
DE1167403B (de) 1964-04-09
GB866246A (en) 1961-04-26
FR1224416A (fr) 1960-06-23

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