US2528387A - Clamped cavity resonator - Google Patents

Clamped cavity resonator Download PDF

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Publication number
US2528387A
US2528387A US668368A US66836846A US2528387A US 2528387 A US2528387 A US 2528387A US 668368 A US668368 A US 668368A US 66836846 A US66836846 A US 66836846A US 2528387 A US2528387 A US 2528387A
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United States
Prior art keywords
resonant cavity
variation
axis
dimensions
temperature
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Expired - Lifetime
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US668368A
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English (en)
Inventor
Niessen Karel Frederik
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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

Definitions

  • This invention relates to an electric resonant cavity, the dimensions of which are dependent on temperature, and to a device for ultra-short waves, for example a radio-transmitting device comprising such a resonant cavity.
  • resonant cavity is to be understood in this description to mean an oscillatory circuit for ultra-short waves having the form of a hollow-space resonator in which a concentrated inductance and capacity are lacking and of which the dimensions are thus of the order of magnitude of the wavelength of the fundamental frequency (smallest natural frequency).
  • these oscillations belong to the non-quasi stationary systems.
  • the walls of such a resonant cavity constitute a body substantially closed on all sides, which usually exhibits the shape of a cylinder, a parallelopiped or a ball and is made of a metal having a very high electrical conductivity such, for example, as copper.
  • the present invention has for its purpose to provide means for limiting or avoiding the fre quency deviation of such a resonant cavity-which occurs with variations in temperature.
  • the resonant cavity body is constructed so as to be liable to deformation, means being provided whereby a variation in the dimensions of the resonant cavity body which occurs with a variation in temperature is locally limited or avoided, which as a matter of fact involves at another place an increase of the variation in dimensions which occurs with thesame variation in temperature.
  • a suitable choice of the place where the latter variation in dimensions occurs that is to say at the place where a corresponding variation in dimensions brings about a frequency deviation smaller or even in- Verse to that brought about by a corresponding variation in dimensions at the first-mentioned place, the frequency deviation with a variation in temperature is compensated at least in part or even an overcompensation may be effected.
  • the invention is thus based on the recognition of the fact that with the resonant cavities F constituted in the usual manner the influences of corresponding variations in dimensions on the frequency variation are so strongly dependent on the place where they occur that an at least partly transfer or displacement of the Variation in dimensions from the place where it occurs to another place, which may be obtained in a simple manner by utilising a resonant cavity body liable to deformation, can limit the frequency Variation.
  • Figures 1 and 3 represent two forms of construction of a spherical resonant cavity according to the invention.
  • Figure 2 shows a section of the resonant cavity shown in Figure 1
  • Figs. 4 and 5 represent a cylindrical and a parallelopiped-shaped resonant cavity according to the invention.
  • reference I indicates a spherical resonant cavity which is constituted, for example, by two copper scales each exhibiting the shape of a hemisphere.
  • This resonant cavity is excited in such manner, for example with the aid of a loop-shaped conductor (not shown) which is led through a recess of the wall into the interior of the resonant cavity, that the field of electrical lines of force produced in the resonant cavity, as viewed in a section according to the plan of the drawing, exhibits the picture indicated by 2 in dotted lines in Fig. 2.
  • the field of electrical lines of force exhibits an axis of symmetry or an electrical axis 3 which co-incides with the geometrical axis Z of the spherical body I.
  • the geometrical equator 4 associated with this geometrical axis coincides with the electrical equator of the resonant cavity which occurs with the described excitation.
  • the present invention makes use thereof for limiting the frequency deviation with variations in temperature.
  • a variation in the electrical length of the axis 3 of the resonant cavity is limited by a clamping device 6 which is arranged outside the resonant cavity and at the places of the extremities of the electrical axis exerts on the spherical body a pressure increasing with temperature.
  • the latter result may be obtained, for example, by manufacturing the clamping device from a material having a linear coefiicient of expansion which is smaller than that of the spherical body constituted by copper or some other good conductor, 1. e. for example by invar, ceramic material, or wood.
  • the pressure exerted on the spherical body by the clamping device and indicated by K in Figure 2 approximately brings about such a deformation of the ball, which is a, body liable to deformation, as to form an ellipsoid flattened in a rotation symmetrical manner relatively to the Z-axis, as is indicated by l in the sectional view.
  • a clamping device which engages the spherical body not only at the points of the extremities of the electrical axis but exhibits a larger contact surface with the spherical body.
  • the contact surface may extend, for example, on each side of the extremities of the electrical axis 3 along the circle 8, which is located in a plane comprising the electrical axis.
  • a band 9 constituted for example by invar, which tightly surrounds the whole spherical body, the band being located in a plane comprising the electrical axis.
  • the spherical body With an increase in temperature the spherical body will now substantially take the form of an ellipsoid elongated in a rotation symmetrical manner relatively to the X-axis.
  • the spherical body is preferably arranged in the clamping device 6 or the band 9 after being cooled down to a temperature which is lower that the lowest operating temperature to be expected.
  • Figs. 4 and 5 One constructional example of the invention with a cylindrical or a parallelopiped-shaped resonant cavity is shown in Figs. 4 and 5. If such a resonant cavit is excited in such manner that, as before, the electrical axis coincides with the Z-axis, a variation in dimension in the direction of the electrical axis will substantially not result in a frequency deviation. On the contrary, variations in dimension in directions normal to the electrical axis, will result in a frequency deviation, these deviations being, however, smaller according as the variations occur farther from the middle of the electrical axis.
  • a greater limitation of the frequency variation or even an overcompensation thereof may be obtained in the manner illustrated in Fig. 5 by utilising two bands l3, [4 arranged preferably symmetrically on each side of the middle of the electrical axis (Z-axis). As it appears from the section indicated in dotted lines by [5, IS, with an increase in temperature there occurs between the bands a decrease in dimensions and at the extremities of the body an increase in dimensions.
  • an overcompensation may in general be obtained by utilising means known per se Whereby a local variation in dimensions of the resonant cavity, in contradistinction to the foregoing, is not only limited or avoided but a variation is effected which is inverse to the variation which normally occurs.
  • a substantially enclosed high-frequency cavity resonator structure constituted by a deformable substance, the dimensions of said structure normally varying in accordance with changes in ambient temperature, and means to clamp said structure at a position maintaining one dimension thereof substantially independent of variation with temperature, whereby said structure becomes deformed in another dimension in response to a temperature change, said structure being characterized by the fact that ayariation' in the value of said other dimension effects a smaller frequency deviation than a corresponding change in the value of said onedimension, said clamping means being constituted by a substance having a coefficient of expansion which is small relative to that of said structure.
  • said band beingconstituted by a sub stance having a coeflicient of expansion which is small relative to that oi the structure.

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  • Control Of Motors That Do Not Use Commutators (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Microwave Tubes (AREA)
US668368A 1942-03-26 1946-05-09 Clamped cavity resonator Expired - Lifetime US2528387A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL238601X 1942-03-26

Publications (1)

Publication Number Publication Date
US2528387A true US2528387A (en) 1950-10-31

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ID=19780421

Family Applications (1)

Application Number Title Priority Date Filing Date
US668368A Expired - Lifetime US2528387A (en) 1942-03-26 1946-05-09 Clamped cavity resonator

Country Status (7)

Country Link
US (1) US2528387A (enrdf_load_stackoverflow)
BE (1) BE449834A (enrdf_load_stackoverflow)
CH (1) CH238601A (enrdf_load_stackoverflow)
DE (1) DE884974C (enrdf_load_stackoverflow)
FR (1) FR892829A (enrdf_load_stackoverflow)
GB (1) GB613479A (enrdf_load_stackoverflow)
NL (1) NL62745C (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890421A (en) * 1953-02-26 1959-06-09 Univ California Microwave cavity filter
US3208017A (en) * 1963-04-08 1965-09-21 Varian Associates Cavity resonator with means for locking tuning plunger
EP0026086A1 (en) * 1979-09-24 1981-04-01 Western Electric Company, Incorporated Microwave device with dielectric resonator
FR2504325A1 (fr) * 1981-04-21 1982-10-22 Thomson Brandt Oscillateur hyperfrequence stabilise par un resonateur dielectrique et procede de reglage de sa frequence
WO1985000698A1 (en) * 1983-06-30 1985-02-14 Hughes Aircraft Company Thermally-compensated microwave resonator utilizing variable current-null segmentation
US4736173A (en) * 1983-06-30 1988-04-05 Hughes Aircraft Company Thermally-compensated microwave resonator utilizing current-null segmentation
EP0306090A1 (fr) * 1987-09-04 1989-03-08 Philips Composants Oscillateur hyperfréquence a résonateur diélectrique, stable par rapport aux vibrations mécaniques
EP0630067A1 (de) * 1993-06-16 1994-12-21 Robert Bosch Gmbh Anordnung zur Kompensation temperaturabhängiger Volumenänderungen eines Hohlleiters
WO2000049676A1 (en) * 1999-02-16 2000-08-24 Andrew Passive Power Products, Inc. Temperature compensated high power bandpass filter
WO2004082066A1 (de) * 2003-03-11 2004-09-23 Tesat Spacecom Gmbh & Co. Kg Vervahren und anordnung zur temperaturkompensierung an rundresonatoren
US8035465B2 (en) 2004-06-03 2011-10-11 Huber & Suhner Ag Cavity resonator, use of a cavity resonator and oscillator circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461730A (en) * 1965-04-02 1969-08-19 Endevco Corp Accelerometer

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US397100A (en) * 1889-01-29 Retaining device for barrel-hoops
US462198A (en) * 1891-10-27 Trunk strap and fastening
US532913A (en) * 1895-01-22 Cistern
US774384A (en) * 1903-12-22 1904-11-08 Philip E Fisher Water-conducting pipe or the like.
US1125011A (en) * 1912-08-22 1915-01-12 Draper Mfg Co Sheet-metal receptacle.
US1668230A (en) * 1923-12-26 1928-05-01 Allegheny Steel Co Annealing box
US2315313A (en) * 1939-09-05 1943-03-30 Gen Electric Cavity resonator
US2370677A (en) * 1941-02-15 1945-03-06 Specialties Dev Corp Container for high-pressure fluids
US2409227A (en) * 1941-07-11 1946-10-15 Bell Telephone Labor Inc Ultra high frequency electronic device
US2460286A (en) * 1938-01-17 1949-02-01 Univ Leland Stanford Junior Radiating electromagnetic resonator

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US397100A (en) * 1889-01-29 Retaining device for barrel-hoops
US462198A (en) * 1891-10-27 Trunk strap and fastening
US532913A (en) * 1895-01-22 Cistern
US774384A (en) * 1903-12-22 1904-11-08 Philip E Fisher Water-conducting pipe or the like.
US1125011A (en) * 1912-08-22 1915-01-12 Draper Mfg Co Sheet-metal receptacle.
US1668230A (en) * 1923-12-26 1928-05-01 Allegheny Steel Co Annealing box
US2460286A (en) * 1938-01-17 1949-02-01 Univ Leland Stanford Junior Radiating electromagnetic resonator
US2315313A (en) * 1939-09-05 1943-03-30 Gen Electric Cavity resonator
US2370677A (en) * 1941-02-15 1945-03-06 Specialties Dev Corp Container for high-pressure fluids
US2409227A (en) * 1941-07-11 1946-10-15 Bell Telephone Labor Inc Ultra high frequency electronic device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890421A (en) * 1953-02-26 1959-06-09 Univ California Microwave cavity filter
US3208017A (en) * 1963-04-08 1965-09-21 Varian Associates Cavity resonator with means for locking tuning plunger
EP0026086A1 (en) * 1979-09-24 1981-04-01 Western Electric Company, Incorporated Microwave device with dielectric resonator
FR2504325A1 (fr) * 1981-04-21 1982-10-22 Thomson Brandt Oscillateur hyperfrequence stabilise par un resonateur dielectrique et procede de reglage de sa frequence
EP0064000A1 (fr) * 1981-04-21 1982-11-03 Societe Electronique De La Region Pays De Loire Résonateur diélectrique réglable, notamment pour oscillateur hyperfréquence, et procédé de réglage d'un tel résonateur
WO1985000698A1 (en) * 1983-06-30 1985-02-14 Hughes Aircraft Company Thermally-compensated microwave resonator utilizing variable current-null segmentation
US4736173A (en) * 1983-06-30 1988-04-05 Hughes Aircraft Company Thermally-compensated microwave resonator utilizing current-null segmentation
FR2620281A1 (fr) * 1987-09-04 1989-03-10 Radiotechnique Compelec Oscillateur hyperfrequence a resonateur dielectrique, stable par rapport aux vibrations mecaniques
EP0306090A1 (fr) * 1987-09-04 1989-03-08 Philips Composants Oscillateur hyperfréquence a résonateur diélectrique, stable par rapport aux vibrations mécaniques
EP0630067A1 (de) * 1993-06-16 1994-12-21 Robert Bosch Gmbh Anordnung zur Kompensation temperaturabhängiger Volumenänderungen eines Hohlleiters
WO2000049676A1 (en) * 1999-02-16 2000-08-24 Andrew Passive Power Products, Inc. Temperature compensated high power bandpass filter
US6232852B1 (en) 1999-02-16 2001-05-15 Andrew Passive Power Products, Inc. Temperature compensated high power bandpass filter
US6529104B1 (en) 1999-02-16 2003-03-04 Andrew Passive Power Products, Inc. Temperature compensated high power bandpass filter
USRE40890E1 (en) * 1999-02-16 2009-09-01 Electronics Research, Inc. Temperature compensated high power bandpass filter
WO2004082066A1 (de) * 2003-03-11 2004-09-23 Tesat Spacecom Gmbh & Co. Kg Vervahren und anordnung zur temperaturkompensierung an rundresonatoren
US20060109068A1 (en) * 2003-03-11 2006-05-25 Franz-Josef Goertz Method and device for compensating the temperature of circular resonators
US7375605B2 (en) 2003-03-11 2008-05-20 Tesat-Spacecom Gmbh & Co. Kg Method and device for compensating the temperature of circular resonators
US8035465B2 (en) 2004-06-03 2011-10-11 Huber & Suhner Ag Cavity resonator, use of a cavity resonator and oscillator circuit

Also Published As

Publication number Publication date
BE449834A (enrdf_load_stackoverflow)
GB613479A (en) 1948-11-29
DE884974C (de) 1953-07-30
CH238601A (de) 1945-07-31
NL62745C (enrdf_load_stackoverflow)
FR892829A (fr) 1944-05-22

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