US2551614A - Tunable magnetron - Google Patents

Tunable magnetron Download PDF

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Publication number
US2551614A
US2551614A US694259A US69425946A US2551614A US 2551614 A US2551614 A US 2551614A US 694259 A US694259 A US 694259A US 69425946 A US69425946 A US 69425946A US 2551614 A US2551614 A US 2551614A
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US
United States
Prior art keywords
magnetron
cylinder
cathode
electron
electrons
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
US694259A
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English (en)
Inventor
Charles V Litton
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE476855D priority Critical patent/BE476855A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US694259A priority patent/US2551614A/en
Priority to GB21920/47A priority patent/GB645189A/en
Priority to FR952312D priority patent/FR952312A/fr
Priority to CH261209D priority patent/CH261209A/de
Application granted granted Critical
Publication of US2551614A publication Critical patent/US2551614A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
    • H01J25/54—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having only one cavity or other resonator, e.g. neutrode tubes

Definitions

  • This invention relates to magnetrons particularly to tunable magnetrons adapted to operate at very high frequencies.
  • magnetrons At those frequencies at which distributed-constant circuit elements are employed, such as for example, coaxial lines or wave guides, certain magnetrons have been proposed whose central cathode is surrounded by a cylindrical anode, which latter has been grooved or provided with inwardly directed vanes to form tuned circuits therein. Such magnetrons are relatively cmplicated, require highly accurate spacing of the cathode in relation to the grooves, careful machining of numerous surfaces of the anode forming the tuned circuits, and fine adjustment of the various potentials and the electromagnetic force applied. These magnetrons are difficult to control and are not capable of being satisfactorily tuned over any substantial frequency range. In order to obtain the optimum operating conditions for a given magnetron, the space between the cathode and anode structure must be carefully adjusted.
  • the optimum spacing cannot be readily predetermined in designing the magnetron and in the structures described, no means are provided for subsequent adjustment. Furthermore this spacing changes with the frequency of operation, and in tuning the magnetron it is desirable to likewise readjust this spacing (referred to hereinafter as: the interaction space).
  • An object of the present invention is the provision of an improved magnetron, particularly one adapted for use at said high frequencies. Another object is to provide a magnetron with a single vane defining two magnetron cavity resonators only.
  • Another object is the provision of a magnetron which is tunable over a range.
  • Another object is the provision of a magnetron in which the interaction space may be readily adjusted.
  • Another object is the provision of a magnetron characterized by simplicity of structure.
  • Fig. 1 is a schematic longitudinal section of a magnetron embodying my invention.
  • Fig. 2 is a similar view taken in a plane revolved 90 from that of Fig. 1.
  • a cathode l is mounted by means of two leads 2 extending through insulators 3 in a metallic bellows G which is fastened to the end plate 5 on a metallic cylinder 6, which end plate 5 and cylinder 6 serve as part of the envelope of the magnetron.
  • the envelope of the magnetron is completed by a glass disk I sealed in the cylinder 6 at a distance from the cathode I. Sealed through a slot in the glass disk I a metallic vane 8 projects towards the cathode I.
  • the vane 8 divides cylinder 6 into two resonant cavities whose tuning is determined by the adjustment of a slidable metallic piston 9 which maybe in contact with the Walls of cylinder 6 and may be capacitively coupled to the vane 8, being slightly spaced therefrom.
  • the vane tapers into the inner conductor III of a coaxial output line, although it will be appreciated that other output means, such as waveguide means may be employed.
  • the cylinder 6 may be capacitively coupled by any suitable arrangement II to the outer conductor l2 surrounding inner conductor Ill, this capacitive arrangement serving to keep the D. C. potentials from the outer conductor I2.
  • a source of potential I3 may be applied to cylinder 6 and vane 8, with the negative side thereof connected to the cathode I.
  • Suitable means such as a choke coil It, may be employed to keep the radio frequency current out of the source I3.
  • any suitable means such as a magnet I5, may be provided.
  • the operation of the device is similar to that of the conventional magnetron with a plurality of tuned or resonant circuits symmetrically arranged about the cathode.
  • the magnetic field produced by N and S along the cathode I causes the electrons to follow spiral paths about the cathode.
  • the electromagnetic field between the vane 8 and the outer cylinder 6 has an electric component that takes energy from some of the electrons.
  • the tuning of the magnetron is accomplished by adjusting the sliding piston 9 which correspondingly changes the size of the resonant cavities I5 and ll.
  • the bellows i is then moved to adjust the interaction; space to the optimum and maintained in position by some retaining means not shown. Both the electromagnetic and electrostatic fields may be further varied for proper adjustment.
  • An electron space discharge device comprising a hollow metallic member, a single metallic element mounted within and spaced from the walls of said member substantially dividing said member into two cavity resonators, said element having a substantially straight end portion, electron emitting means, mounted in said hollow member in parallel relation to said end portion and means positioned adjacent said emitting means for causing said electrons to follow curved paths with respect to said metallic element, said electron producing oscillations in said cavity resonators.
  • An electron space discharge device comprising a hollow metallic cylinder along the longitudinal axis thereof, a flat plate mounted within said cylinder substantially dividing said cylinder into two cavity resonators, electron emitting means mounted in said cylinder parallel to said plate, and means positioned adjacent said emitting means for causing said electrons to follow curved paths with respect to said flat plate, said electrons producing oscillations in said cavity resonators.
  • An electron space discharge device comprising a hollow cylinder, a plate within said cylinder substantially dividing said cylinder alon the longitudinal axis thereof into two cavity resonators, electron emitting means mounted in said cylinder adjacent and parallel to an end of said plate, means positioned adjacent said emitting means for causing said electrons to follow curved paths with respect to said plate, said electrons producing oscillations in said cavity resonators, and a coaxial output line having its inner conductor coupled to said plate and its outer conductor coupled to said cylinder.
  • a magnetron comprising a hollow metallic member, a metallic element substantially dividing said member into two cavity resonators, electron emitting means mounted in said hollow member parallel to said metallic element, an envelope enclosing said emitting means, said hollow member and metallic element extending outwardly from said envelope, a plunger in said hollow member external to said envelope for tuning said cavity resonator, and magnetic field producing means positioned adjacent said emitting means for causing said electrons to follow curved paths with respect to said metallic element.
  • An electron space discharge device wherein said electron emitting means includes a cathode mounted at a spaced distance from said metallic element, and means connected between said cathode and said hollow member for varying the spacing therebetween.
  • An electron space discharge device according to claim 3 wherein said plate and said inner conductor are coupled together by a tapered member.
  • An electron space discharge device wherein said electron emitting means is a cathode, and wherein there are further provided a flexible bellows supported from said cylinder and means on said bellows for supporting said cathode, whereby the spacing between said cathode and said plate may be varied.
  • An electron space discharge device further including piston means mounted within said member and adapted for effectively varying the tuning of said cavity resonators.
  • An electron space discharge device according to claim 3 further including adjustable means in said hollow member for varying th dimensions of said cavity resonators.

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  • Microwave Tubes (AREA)
US694259A 1946-08-31 1946-08-31 Tunable magnetron Expired - Lifetime US2551614A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE476855D BE476855A (de) 1946-08-31
US694259A US2551614A (en) 1946-08-31 1946-08-31 Tunable magnetron
GB21920/47A GB645189A (en) 1946-08-31 1947-08-08 Tunable magnetron
FR952312D FR952312A (fr) 1946-08-31 1947-08-25 Magnétrons accordables à très haute fréquence
CH261209D CH261209A (de) 1946-08-31 1947-08-30 Magnetron.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US694259A US2551614A (en) 1946-08-31 1946-08-31 Tunable magnetron

Publications (1)

Publication Number Publication Date
US2551614A true US2551614A (en) 1951-05-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
US694259A Expired - Lifetime US2551614A (en) 1946-08-31 1946-08-31 Tunable magnetron

Country Status (5)

Country Link
US (1) US2551614A (de)
BE (1) BE476855A (de)
CH (1) CH261209A (de)
FR (1) FR952312A (de)
GB (1) GB645189A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667598A (en) * 1951-11-30 1954-01-26 Rca Corp Electron discharge apparatus utilizing a cavity resonator
US2933607A (en) * 1954-12-16 1960-04-19 J J Maguire Radiation displacement gauge with remote indication
CN107946157A (zh) * 2017-12-31 2018-04-20 中国电子科技集团公司第十二研究所 一种同轴磁控管的微波频率微调装置及同轴磁控管

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2037977A (en) * 1931-05-08 1936-04-21 Rca Corp High frequency oscillation system
US2129713A (en) * 1938-09-13 High frequency oscillation system
US2167201A (en) * 1935-06-28 1939-07-25 Pintsch Julius Kg Electron tube
US2190668A (en) * 1937-07-31 1940-02-20 Bell Telephone Labor Inc Diode oscillator
US2247077A (en) * 1940-07-27 1941-06-24 Gen Electric High frequency electronic apparatus
US2278210A (en) * 1940-07-05 1942-03-31 Bell Telephone Labor Inc Electron discharge device
US2407974A (en) * 1942-12-29 1946-09-24 Westinghouse Electric Corp Ultra high frequency device
US2415962A (en) * 1942-10-16 1947-02-18 Westinghouse Electric Corp Automatic switch for ultra high frequency

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2129713A (en) * 1938-09-13 High frequency oscillation system
US2037977A (en) * 1931-05-08 1936-04-21 Rca Corp High frequency oscillation system
US2167201A (en) * 1935-06-28 1939-07-25 Pintsch Julius Kg Electron tube
US2190668A (en) * 1937-07-31 1940-02-20 Bell Telephone Labor Inc Diode oscillator
US2278210A (en) * 1940-07-05 1942-03-31 Bell Telephone Labor Inc Electron discharge device
US2247077A (en) * 1940-07-27 1941-06-24 Gen Electric High frequency electronic apparatus
US2415962A (en) * 1942-10-16 1947-02-18 Westinghouse Electric Corp Automatic switch for ultra high frequency
US2407974A (en) * 1942-12-29 1946-09-24 Westinghouse Electric Corp Ultra high frequency device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667598A (en) * 1951-11-30 1954-01-26 Rca Corp Electron discharge apparatus utilizing a cavity resonator
US2933607A (en) * 1954-12-16 1960-04-19 J J Maguire Radiation displacement gauge with remote indication
CN107946157A (zh) * 2017-12-31 2018-04-20 中国电子科技集团公司第十二研究所 一种同轴磁控管的微波频率微调装置及同轴磁控管

Also Published As

Publication number Publication date
CH261209A (de) 1949-04-30
FR952312A (fr) 1949-11-15
BE476855A (de)
GB645189A (en) 1950-10-25

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