US3087128A - Cavity resonator having a variable quality factor - Google Patents

Cavity resonator having a variable quality factor Download PDF

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Publication number
US3087128A
US3087128A US853765A US85376559A US3087128A US 3087128 A US3087128 A US 3087128A US 853765 A US853765 A US 853765A US 85376559 A US85376559 A US 85376559A US 3087128 A US3087128 A US 3087128A
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US
United States
Prior art keywords
cavity
quality factor
cavity resonator
pistons
resonator
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Expired - Lifetime
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US853765A
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English (en)
Inventor
Frigyes Istvan
Almassy Gyorgy
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.)
Budavox Budapesti Hiradastechnikai Vallalat
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Budavox Budapesti Hiradastechnikai Vallalat
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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

  • a cavity resonator having a high quality factor must be employed, but in the testing of the modulator of a transmitter a cavity resonator having a larger band width than the tested signal must be employed, and this can therefore generally be done by means of a signal decoupled from a cavity resonator and detected. If the quality factor of the cavity resonator of lower quality factor is variable, the same resonator may be employed for both purposes.
  • the quality factor of the cavity resonator can be reduced by artifically increasing the cavity losses.
  • Methods are known from the technical literature, in which, for example, a high-loss material is introduced into the cavity, or a plate coated with a high-loss material is moved relative to the electric force lines, and so on.
  • the mechanism varying the quality factor of the cavity resonator is so connected to a mechanism by which the frequency thereof is finely tuned that the frequency variation set up at the variation of the quality factor is automatically balanced out.
  • a constructional example of the cavity resonator according to the invention is illustrated in the drawing at 1.
  • the diameters of the tubes 2 and 5 extending from the Wall of the cavity resonator 1 must be so dimensioned that, if the tubes are also filled by the dielectric elements 4, 7, the resonance frequency of the cavity 10, which is tunable by the tuning piston 9, is higher than the lowest limit frequency.
  • the tuning piston Disposed in the tube 2 is the tuning piston 3, which can be moved by means of the dielectric rod 4.
  • the piston may consist of various high-loss materials, such for example as iron powder cores, or dielectric materials and the like saturated wtih graphite may be employed, but the greatest advantage is aiforded by a ferromagnetic material, because in this case a given percentage variation of the quality factor is accompanied by a smaller detuning of the frequency.
  • the tuning piston 6 Disposed in the tube 5 is the tuning piston 6 consisting of dielectric material or metal and movable by means of the dielectric rod 7.
  • Tuning piston 3 efiects a greater loss than tuning piston 6, and it will be noted that piston 3 may thus consist of ferromagnetic material.
  • the dielectric rods 4 and 7 are connected together by the connecting rod 8.
  • the dimensions of the tuning piston 6 must be such that the resonance frequency variation resulting from the displacement of the tuning piston 3, constructed of high loss material is compensated for by the displacement of the piston 6.
  • the resonance frequency variation may also be balanced out by connecting the dielectric rods 4 and 7, not directly, but indirectly by means of an appropriate transmission system.
  • means for varying the quality factor comprising at least one pair of tuning pistons operatively associated with the resonator cavity and movable conjointly and in opposed direct-ions relative to such cavity; the dimensions of said pistons being so selected that the resonance frequency of the cavity is not appreciably varied by such conjoint movement of said pistons; the materials of the respective pistons differing as to loss factors.
  • Cavity resonator according to claim 1 characterized in that the tuning piston effecting the greater loss consists of ferro magnetic material.
  • Cavity resonator according to claim 1 characterized in that the tuning pistons are rigidly connected together for such conjoint movement.
  • Cavity resonator according to claim 1 characterized in that the tuning pistons are connected together through a transmission system for such conjoint movement.
  • Cavity resonator according to claim 1 in which the pistons of each pair are movable in cylinders extending in aligned opposed relation from, and communicating with, the cavity of said resonator.

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  • Particle Accelerators (AREA)
US853765A 1958-11-19 1959-11-18 Cavity resonator having a variable quality factor Expired - Lifetime US3087128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HUBU000190 1958-11-19

Publications (1)

Publication Number Publication Date
US3087128A true US3087128A (en) 1963-04-23

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ID=10993807

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US853765A Expired - Lifetime US3087128A (en) 1958-11-19 1959-11-18 Cavity resonator having a variable quality factor

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US (1) US3087128A (enrdf_load_html_response)
CH (1) CH374729A (enrdf_load_html_response)
DE (1) DE1093438B (enrdf_load_html_response)
FR (1) FR1240327A (enrdf_load_html_response)
GB (1) GB937175A (enrdf_load_html_response)
NL (1) NL245452A (enrdf_load_html_response)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187278A (en) * 1963-11-12 1965-06-01 Sylvania Electric Prod Tunable coaxial cavity resonator with plunger mounted ring for shorting coupling loops
US3311839A (en) * 1965-12-16 1967-03-28 Northern Electric Co Compensated tunable cavity with single variable element
US3444485A (en) * 1967-03-17 1969-05-13 Bell Telephone Labor Inc Single adjustment,variable selectivity-constant frequency coaxial transmission line filter
US3699480A (en) * 1969-12-15 1972-10-17 Microwave Ass Variable rf group delay equalizer
US3748604A (en) * 1971-04-21 1973-07-24 Bell Telephone Labor Inc Tunable microwave bandstop resonant cavity apparatus
FR2308076A1 (fr) * 1975-04-14 1976-11-12 Civolani Bruno Systeme de percussion radiale pour armes a feu utilisant des projectiles a autopropulsion et a amorce peripherique
EP0522300A3 (en) * 1991-07-10 1993-09-22 Schott Glaswerke Arrangement for coupling microwave energy

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015006368A1 (de) * 2015-05-20 2016-11-24 Mician Global Engineering Gbr Bandpassfilter mit einem Hohlraumresonator und Verfahren zum Betreiben, Einstellen oder Herstellen eines solchen Bandpassfilters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB635131A (en) * 1945-09-27 1950-04-05 Westinghouse Electric Int Co Improvements in or relating to high frequency transmission systems embodying wave guides
US2566050A (en) * 1949-04-12 1951-08-28 Johnson Service Co Electrical resonator
US2579327A (en) * 1946-01-30 1951-12-18 Bell Telephone Labor Inc High-frequency energy absorbing variable coupling device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL77933C (enrdf_load_html_response) * 1942-01-29
US2688122A (en) * 1947-08-28 1954-08-31 Bell Telephone Labor Inc Constant q resonator
DE836365C (de) * 1950-02-21 1952-04-10 Blaupunkt Werke Gmbh Einrichtung zur verstimmungsfreien Daempfungsaenderung eines abgestimmten Schwingungskreises

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB635131A (en) * 1945-09-27 1950-04-05 Westinghouse Electric Int Co Improvements in or relating to high frequency transmission systems embodying wave guides
US2579327A (en) * 1946-01-30 1951-12-18 Bell Telephone Labor Inc High-frequency energy absorbing variable coupling device
US2566050A (en) * 1949-04-12 1951-08-28 Johnson Service Co Electrical resonator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187278A (en) * 1963-11-12 1965-06-01 Sylvania Electric Prod Tunable coaxial cavity resonator with plunger mounted ring for shorting coupling loops
US3311839A (en) * 1965-12-16 1967-03-28 Northern Electric Co Compensated tunable cavity with single variable element
US3444485A (en) * 1967-03-17 1969-05-13 Bell Telephone Labor Inc Single adjustment,variable selectivity-constant frequency coaxial transmission line filter
US3699480A (en) * 1969-12-15 1972-10-17 Microwave Ass Variable rf group delay equalizer
US3748604A (en) * 1971-04-21 1973-07-24 Bell Telephone Labor Inc Tunable microwave bandstop resonant cavity apparatus
FR2308076A1 (fr) * 1975-04-14 1976-11-12 Civolani Bruno Systeme de percussion radiale pour armes a feu utilisant des projectiles a autopropulsion et a amorce peripherique
EP0522300A3 (en) * 1991-07-10 1993-09-22 Schott Glaswerke Arrangement for coupling microwave energy

Also Published As

Publication number Publication date
FR1240327A (fr) 1960-09-02
DE1093438B (de) 1960-11-24
NL245452A (enrdf_load_html_response)
CH374729A (de) 1964-01-31
GB937175A (en) 1963-09-18

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