US2504739A - Electron discharge device having a cavity resonator provided with a tuning electrode - Google Patents

Electron discharge device having a cavity resonator provided with a tuning electrode Download PDF

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Publication number
US2504739A
US2504739A US555943A US55594344A US2504739A US 2504739 A US2504739 A US 2504739A US 555943 A US555943 A US 555943A US 55594344 A US55594344 A US 55594344A US 2504739 A US2504739 A US 2504739A
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United States
Prior art keywords
cavity
cathode
tuning
anode
magnetron
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
US555943A
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English (en)
Inventor
William E Shoupp
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 BE472619D priority Critical patent/BE472619A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US555943A priority patent/US2504739A/en
Priority to GB6916/47A priority patent/GB641086A/en
Priority to FR947720D priority patent/FR947720A/fr
Application granted granted Critical
Publication of US2504739A publication Critical patent/US2504739A/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
    • H01J25/58—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 a number of resonators; having a composite resonator, e.g. a helix
    • H01J25/587—Multi-cavity magnetrons
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/30—Angle modulation by means of transit-time tube
    • H03C3/32—Angle modulation by means of transit-time tube the tube being a magnetron

Definitions

  • i rhts mventien relates to 'electron discharge deames generally referred “to as magnetrons, and vmrtmumnyw "tuning 'mean's for the same.
  • thorns as somewhat 'fles'criptii e oftmii'rrg means f'or a magnetron, and -coiisistltg 6f a plurality of wrongs, one in each flit fsei eral resonant *oavities or a magii'etron, and
  • an object 'of the ipr'esent mvefltioh is t'o proyide a tuning means and/or a ereouemsy modulation means for a magnetron *whmn wflmccompiisn tuning by electrical in'eththereby avoiiiin'g th'e Iadverse structured and operational characteristics rel'ated afbove -'for the crown of thorns method.
  • the invention contemplates-operator control of internal tuning means biit without transitional movement "of hie'chninism .lirom 'exterior "to interior of the ima ematron.
  • Figure is a detail sectional viewer a part of the magnetron ason t me (if 2., sh'oiilmazes.-
  • the invention provides fixed means within the endspaces of the magnetron, -here #shown as rings, between which extend a plurality of tuning elements.
  • Each Ituning element passeslongitudinally through a, const1 icted :part of one of the resonantcavitiesof the magnetron, and is .shown eccentric to vthe cylindrical part of suchcavityhere depicted as ;using that conventional shape.
  • the invention “however, is not limited to this shape of cavity and -location of tuning element.
  • the reference numeral l0 designates .a cylindrical metallic magnetron body, the ends whereof have cover or end plates i l sealed therein that the interior may be evacuated.
  • said body Within and as an integral :part 01 said body the usual magnetron anode structure 12 of generally cylindrical-shape but shorter-than the outer part oi-the body-so as -to"-provide end spaces l3 between the anodea-nd said end plates I.
  • Tl-1e anodeastructure is axially hollow to provide a cathodecavity and radiating from this cathode cavity are a vplurality 'of resonant cavities 14, each havingin the form shown a cylindrical ,portion ,parallel to the cathode cavity and each cylindrical portion havinga longitudinal constricted capacitativeslot I 5 constituting-a lateral opening from the cylin drical ;portion of the cavity :into the hollowcentral :part of cathode chamber of the magnetron.
  • Said lead-in rod is introduced through a hollow housing 2
  • Each said tuning electrode has ends thereof protrudinginto the end spaces l3, and those ends are secured, as
  • tuning electrode may be a hot cathode, emissive of electrons due to heat generated by an electric current travers- ,''ing the said cathode by virtue of connection through the arms, rings and lead-in rods. Control of the current thus applied to said tuning electrodes will vary, as desired, the electron emission from said tuning electrodes.
  • a modulation voltage may be applied from the exterior to one ring and to the anode, in which event variation in the modulation voltage efiectlve between the tuning electrode and the anode may be utilized as the tuning means with or without altering the current applied for heating the tuning electrode.
  • said tuning electrode may be of a character which readily emits secondary electrons released by bombardment. Such bombardment may be obtained in part by electronsfrom the cathode l6 of the magnetron and in part by electrons returning to said tuning electrode.
  • a modulation voltage is applied, as above described,
  • the electrons from the tuning electrode will vary their average distance from that electrode and consequently will modify-the for the purpose, such as alloys of silver-magnesium, beryllium-copper, pure-beryllium or other substances or alloys used either as the entire body of the electrode or as a part or coating therefor.
  • the tuning electrode is shown and preferably is situated in the constricted or slot portion of the cavity; its essential location is more broadly defined as eccentric to the axis of the cavity and somewhat more specifically as in proximity to the constricted portion of the cavity.
  • An electron discharge device having a cathode and anode with cavity resonators in the anode having constricted portions, tuning means longitudinally disposed in a cavity resonator in proximity to a constricted portion and projecting out of opposite ends of said cavity resonator, and means mounting said tuning means by said-pro jecting ends with the 'major portion of said tuning means in said cavity resonator.
  • An electron discharge device havinga cathode and an anode around the cathode, said anode having a cathode cavity and having cavity resonators opening intosaid cathode cavity, and electron emissive tuning means longitudinally disposed in one of said cavity resonators in proximity to the opening of a cavity resonator into the cathode cavity, said tuning-means having a cross-section negligible in size compared to said cavity resonator whereby the cavity resonator is unobstructed to electrical lines of force longitudinal of said cavity resonator and tuning means.
  • An electrondischarge device having a cathode and an anode around the cathode, said anode having a, cathodecavity and having a substantially cylindrical cavityresonator opening lateryally into said'cathode cavity with a constricted strode functioning as a secondary emitter.
  • star 76 openin and a tuning electrode parallel to said cathode and eccentrically disposed with respect to said cylindrical cavity resonaton- A V 4.
  • An electr q le teedevi e havinsa gathode and an anode around the cathode, said anode having a cathode cavity and having a cavity resonator the major part whereof is substantially cylindrical, said cavity resonator opening laterally into said cathode cavity with a constricted opening, and a tuning electrode in said constricted opening.
  • An electron discharge devic having a cathode and an anode with a cathode cavity and cavity resonators in the anode and with con- E having substantially cylindrical portions axially parallel to the cathode, and tuning means in one of said resonators axially eccentric thereto and substantially coextensive with the axial length of said resonator.
  • a magnetron comprising an enclosure, an anode body within the enclosure spaced from the ends thereof providing end spaces within the enclosure, said anode body having a cathode cavity and cavity resonators extending from one to the other of and opening into both said end spaces, a cathode in said cathode cavity, supporting rings in said end spaces concentric with the cathode and of greater diameter than the cathode cavity, and tuning electrodes supported from said rings and extending the length of and each within a cavity resonator.
  • a magnetron comprising an enclosure, an anode body within the enclosure spaced from the ends thereof providing end spaces within the enclosure, said anode body having a cathode cavity and cavity resonators extending from one to the other of and opening into both said end spaces, a cathode in said cathode cavity, supporting rings in said and spaces concentric with the cathode and of greater diameter than the cathode cavity, insulating mounting means for said rings interposed between said rings and the anode body, and tuning electrodes supported from said rings and extending the length of and each within a cavity resonator.
  • a magnetron comprising an enclosure, an
  • anode body within the enclosure spaced from the ends thereof providing end spaces within the enclosure, said anode body having a cathode cavity and cavity resonators extending from one to the other of and opening into both said end spaces and extending laterally from the cathode cavity and providing a constriction next to and opening into said cathode cavity, supporting rings in said end spaces concentric with the cathode and of greater diameter than the cathode cavity, and tuning electrodes supported from said rings and extending the length of a cavity resonator and each within a constriction of a cavity resonator.
  • a magnetron comprising an enclosure, an anode body within the enclosure spaced from the ends thereof providing end spaces within the enclosure, said anode body having a cathode cavity and cavity resonators extending from one to the otherof and opening into both said end spaces, a cathode in said cathode cavity, supporting rings in said end spaces substantially overlying a part of each cavity resonator, radially directed tensioning arms secured to said rings, and tuning electrodes supported from said tensioning arms and extending the length of and each within a cavity resonator.
  • a magnetron comprising an enclosure, an anode body within the enclosure spaced from the ends thereof providing end spaces within the enclosure, said anode body having a cathode cavity and cavity resonators extending from one to the other of and opening into both said end spaces, a cathode in said cathode cavity, supporting rings in each of said end spaces and substantially next to the peripheries of said end spaces, tensioning arms secured to said rings and projecting radially inward thereof, and tuning electrodes supported between pairs of said arms in said resonators.
  • a magnetron comprising an enclosure, an anode body within the enclosure spaced from the ends thereof providing end spaces within the enclosure, said anode body having a cathode cavity and cavity resonators extending from one to the other of and opening into both said end spaces and extending laterally from the cathode cavity and providing a constriction next to and opening into said cathode cavity, supporting rings in each of said end spaces at a part thereof remote from the said constriction of the cavity resonator, a tensioning arm secured on said ring and projecting therefrom to a position overlying said constriction,'and a tuning electrode supported from said tensioning arm and located in said constriction.
  • a tunable magnetron comprising a single anode having cavity resonators, and two cathodes insulated from each other and from said anode, said anode functioning as such for both said cathodes, each said cathode having means coupled thereto for applying a difference of potential between it and said anode and for applying to the two cathodes potentials differing from each other, whereby emission from one cathode is adapted to produce high frequency oscillations in the magnetron and emission from the other cathode is adapted to tune said oscillations over a band of frequencies inclusive of the produced high frequency oscillations.
  • a tunable magnetron comprising a single anode having cavity resonators, and two cathodes insulated from each other and from said anode, said anode functioning as such for both said cathodes, each of said cathode having means coupled thereto for applying a difference of potential between it and said anode and for applying to the two cathodes potentials differing from each other, whereby emission from one cathode is adapted to produc high frequency oscillations in the magnetron, and a source of modulation voltage connected to the said potential applying meansof the other cathode for varying the said oscillations over a band of frequencies inclusive of the produced high frequency oscillations.

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US555943A 1944-09-27 1944-09-27 Electron discharge device having a cavity resonator provided with a tuning electrode Expired - Lifetime US2504739A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE472619D BE472619A (fr) 1944-09-27
US555943A US2504739A (en) 1944-09-27 1944-09-27 Electron discharge device having a cavity resonator provided with a tuning electrode
GB6916/47A GB641086A (en) 1944-09-27 1947-03-12 Improvements in or relating to magnetrons
FR947720D FR947720A (fr) 1944-09-27 1947-06-07 Appareil à décharge électronique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US555943A US2504739A (en) 1944-09-27 1944-09-27 Electron discharge device having a cavity resonator provided with a tuning electrode

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US2504739A true US2504739A (en) 1950-04-18

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US (1) US2504739A (fr)
BE (1) BE472619A (fr)
FR (1) FR947720A (fr)
GB (1) GB641086A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742570A (en) * 1951-02-28 1956-04-17 M O Valve Co Ltd Magnetron oscillators
US2748277A (en) * 1951-11-23 1956-05-29 Raytheon Mfg Co Magnetron noise generators
US2750506A (en) * 1953-03-26 1956-06-12 Raytheon Mfg Co High-frequency modulation systems
US2765424A (en) * 1951-03-30 1956-10-02 Westinghouse Electric Corp Magnetron
US2781476A (en) * 1944-11-16 1957-02-12 Rca Corp Magnetron
US2782342A (en) * 1947-07-01 1957-02-19 Rca Corp Magnetron
DE1052582B (de) * 1951-06-26 1959-03-12 Raytheon Mfg Co Elektronenroehre nach Art einer Magnetrongeneratorroehre zur Erzeugung amplitudenmodulierter Schwingungen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826719A (en) * 1955-04-01 1958-03-11 Rca Corp Magnetron

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063342A (en) * 1934-12-08 1936-12-08 Bell Telephone Labor Inc Electron discharge device
US2241976A (en) * 1940-04-25 1941-05-13 Gen Electric High frequency apparatus
US2270777A (en) * 1939-04-06 1942-01-20 Telefunken Gmbh Ultra short wave electron discharge device system
US2338237A (en) * 1939-12-22 1944-01-04 Standard Telephon & Radio Ag High-frequency electron discharge apparatus
US2408234A (en) * 1941-11-26 1946-09-24 Raytheon Mfg Co Tunable magnetron
US2412372A (en) * 1943-10-26 1946-12-10 Rca Corp Magnetron

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063342A (en) * 1934-12-08 1936-12-08 Bell Telephone Labor Inc Electron discharge device
US2270777A (en) * 1939-04-06 1942-01-20 Telefunken Gmbh Ultra short wave electron discharge device system
US2338237A (en) * 1939-12-22 1944-01-04 Standard Telephon & Radio Ag High-frequency electron discharge apparatus
US2241976A (en) * 1940-04-25 1941-05-13 Gen Electric High frequency apparatus
US2408234A (en) * 1941-11-26 1946-09-24 Raytheon Mfg Co Tunable magnetron
US2412372A (en) * 1943-10-26 1946-12-10 Rca Corp Magnetron

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781476A (en) * 1944-11-16 1957-02-12 Rca Corp Magnetron
US2782342A (en) * 1947-07-01 1957-02-19 Rca Corp Magnetron
US2742570A (en) * 1951-02-28 1956-04-17 M O Valve Co Ltd Magnetron oscillators
US2765424A (en) * 1951-03-30 1956-10-02 Westinghouse Electric Corp Magnetron
DE1052582B (de) * 1951-06-26 1959-03-12 Raytheon Mfg Co Elektronenroehre nach Art einer Magnetrongeneratorroehre zur Erzeugung amplitudenmodulierter Schwingungen
US2748277A (en) * 1951-11-23 1956-05-29 Raytheon Mfg Co Magnetron noise generators
US2750506A (en) * 1953-03-26 1956-06-12 Raytheon Mfg Co High-frequency modulation systems

Also Published As

Publication number Publication date
FR947720A (fr) 1949-07-11
GB641086A (en) 1950-08-02
BE472619A (fr)

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