US2734148A - Magnetron tube - Google Patents

Magnetron tube Download PDF

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Publication number
US2734148A
US2734148A US2734148DA US2734148A US 2734148 A US2734148 A US 2734148A US 2734148D A US2734148D A US 2734148DA US 2734148 A US2734148 A US 2734148A
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Prior art keywords
magnetron
axis
auxiliary
cathode
resonator
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Expired - Lifetime
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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
    • H01J25/55—Coaxial cavity magnetrons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof
    • H01J23/213—Simultaneous tuning of more than one resonator, e.g. resonant cavities of a magnetron

Definitions

  • the present invention refers to magnetron tubes and more particularly to magnetron oscillators with cavity resonators whose oscillation frequency may be adjusted.
  • Tunable magnetrons of the prior art can be divided in two main classes.
  • the tuning of the whole anodic block is performed by alteration of one cavity resonator only; in the other class, the resonating frequency of all the cavity resonators is simultaneously adjusted by means of a device which is symmetrical with respect to the axis of the cathode.
  • Frequency adjustment performed by acting upon one cavity resonator only presents certain disadvantages, namely that the effect on the whole of the anodic block is small and therefore a small range of frequencies is covered; further dissymmetry is introduced in the field with respect to the cathode axis, thus reducing the efficiency.
  • a magnetron having a cylindrical cathode and a concentric anodic block grooved with cavity resonators, hereinafter termed main cavity resonators comprises an additional adjustable cavity resonator, hereinafter called auxiliary cavity resonator, which is simultaneously coupled to alternate main cavity resonators, the coupling means being symmetrical with respect to the cathode axis.
  • Fig. 1 shows a longitudinal section, by a plane passing through the axis of the cathode, of a magnetron according to the invention.
  • Fig. 2 is a section of the magnetron according to the invention by a plane perpendicular to the cathode axis and shows the distribution of the lines of force of the electric field.
  • Fig. 2a very diagrammatically shows a perspective view of the magnetron according to the invention with a portion cut away.
  • Fig. 3 is an equivalent diagram of the magnetron.
  • Fig. 4 shows a section of the magnetron according to the invention, by a plane comprising the axis of the magnetron, the latter being provided with a lateral auxiliary cavity resonator.
  • main cavity resonators provided in an anodic block 1 are coupled to a concentric auxiliary cavity resonator 5, by
  • the external cavity resonator operates according to modes of H type which are symmetrical with respect to the magnetron axis, as shown in Figure 2. As the lines of force of the electric field have no transversal component, piston 7 may be mounted with some clearance with respect to the resonator walls.
  • Fig. 3 is the equivalent diagram of the anodic block. It comprises a network of 2 N poles, N being the number of main cavity resonators, each pair of poles being connected to an admittance Y1, and alternate admittances Y being respectively coupled through transformers T to variable impedances Z2, coupled to each other.
  • Y1 represents a main cavity resonator
  • T the coupling apertures
  • the chain of impedances Z2 represents the auxiliary cavity resonator.
  • Z2 makes it possible to vary the resonance frequency of the network by adjustment of the values of Y1 and Z2;
  • the described system presents a rotational symmetry of the order N/2 around the axis. Therefore, the electromagnetic fields inside the magnetron will present the same symmetry;
  • the magnetron of the invention is made equivalent to a rising sun magnetron.
  • Fig. 4 shows a section of another embodiment of the magnetron according to the invention by a plane comprising the magnetron axis.
  • an auxiliary cavity resonator 5 still operating according to modes H, is coupled to alternate main cavity resonators by means of an apertured lateral wall 2.
  • the volume of auxiliary cavity resonator 5 can be changed by means of a piston 7, fixed to a flexible membrane 8.
  • a magnetron tube of the type comprising a cathode having an axis, an anode including a plurality of main cavity resonators, an auxiliary tunable cavity resonator, and means for coupling said auxiliary cavity resonator with said main cavity resonators: said coupling means being positioned in alternate main cavity resonators and symmetrically located with respect to the axis of said cathode.
  • a magnetron tube of the type comprising a cathode having an axis, an anode including a plurality of main cavity resonators, an auxiliary tunable cavity resonator, and means for coupling said auxiliary resonator with said main resonators: said coupling means constituted by apertures respectively provided in alternate main cavities to connect said alternate main cavities with said auxiliary cavity, said apertures being symmetrical with respect to the axis of said cathode, the respective centers of said apertures being contained in the same plane.
  • a magnetron, tube comprising a cathode having. an axis, an anode including'a plurality of main cavity resonators, an auxiliary tunable cavity resonator, said tunable resonator being toroidal and coaxially surrounding said anode, a common Wall separating said auxiliary resonator and said main resonators, saicl common wall having apertures provided therein to connect alternate main cavity resonators with said auxiliary cavity resonator, said apertures being symmetrical with respect to the axis of said cathode, the respective centers of said apertures being contained in the same plane.
  • a magnetron tube comprising a cathode having an axis, an anode including a plurality of main cavity resonators, a lateral wall to close said" main resonators, an
  • auxiliary tunable cavity resonator said auxiliary resonator being toroidal and adjacent to said wall, said wall being provided with apertures to connect alternate main cavity resonators With said auxiliary cavity resonator, said apertures being symmetrical with respect to the axis of the cathode.

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  • Microwave Tubes (AREA)
US2734148D 1950-04-03 Magnetron tube Expired - Lifetime US2734148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR839950X 1950-04-03

Publications (1)

Publication Number Publication Date
US2734148A true US2734148A (en) 1956-02-07

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Application Number Title Priority Date Filing Date
US2734148D Expired - Lifetime US2734148A (en) 1950-04-03 Magnetron tube

Country Status (5)

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US (1) US2734148A (fr)
CH (1) CH290732A (fr)
DE (1) DE839950C (fr)
FR (1) FR1015901A (fr)
GB (1) GB701925A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2854603A (en) * 1955-05-23 1958-09-30 Bell Telephone Labor Inc Magnetrons
US2928023A (en) * 1950-12-28 1960-03-08 Charles V Litton Multiple resonator tunable magnetron
US2951182A (en) * 1957-11-25 1960-08-30 Bell Telephone Labor Inc Magnetron
US2976458A (en) * 1958-12-29 1961-03-21 Bell Telephone Labor Inc Magnetron
US3032681A (en) * 1958-12-22 1962-05-01 Bomac Lab Inc Magnetron device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB709129A (en) * 1951-07-13 1954-05-19 English Electric Valve Co Ltd Improvements in or relating to magnetrons
US2808538A (en) * 1952-10-02 1957-10-01 Bell Telephone Labor Inc Magnetron oscillator
DE1006913B (de) * 1953-02-28 1957-04-25 Elektronik Ges Mit Beschraenkt Magnetronroehre mit Topfkreis
DE1046786B (de) * 1953-11-17 1958-12-18 Deutsche Elektronik Gmbh Durchstimmbare Magnetfeldroehre der Radbauart
NL277268A (fr) * 1961-04-26
US3334268A (en) * 1963-09-25 1967-08-01 Raytheon Co Magnetron tube having alternate cavities of the anode structure directly coupled to a stabilizing cavity
JPS54113241A (en) * 1978-02-24 1979-09-04 Hitachi Ltd Magnetron

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2411953A (en) * 1944-01-10 1946-12-03 Raytheon Mfg Co Electron discharge device of the magnetron type
US2419172A (en) * 1943-11-19 1947-04-15 Rca Corp Electron discharge device having coupled coaxial line resonators
US2450629A (en) * 1944-03-14 1948-10-05 Gen Electric Ultra high frequency magnetron generator
US2466060A (en) * 1945-03-31 1949-04-05 Raytheon Mfg Co Electron discharge device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419172A (en) * 1943-11-19 1947-04-15 Rca Corp Electron discharge device having coupled coaxial line resonators
US2411953A (en) * 1944-01-10 1946-12-03 Raytheon Mfg Co Electron discharge device of the magnetron type
US2450629A (en) * 1944-03-14 1948-10-05 Gen Electric Ultra high frequency magnetron generator
US2466060A (en) * 1945-03-31 1949-04-05 Raytheon Mfg Co Electron discharge device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928023A (en) * 1950-12-28 1960-03-08 Charles V Litton Multiple resonator tunable magnetron
US2854603A (en) * 1955-05-23 1958-09-30 Bell Telephone Labor Inc Magnetrons
US2951182A (en) * 1957-11-25 1960-08-30 Bell Telephone Labor Inc Magnetron
US3032681A (en) * 1958-12-22 1962-05-01 Bomac Lab Inc Magnetron device
US2976458A (en) * 1958-12-29 1961-03-21 Bell Telephone Labor Inc Magnetron
US3034014A (en) * 1958-12-29 1962-05-08 Bell Telephone Labor Inc Magnetron

Also Published As

Publication number Publication date
DE839950C (de) 1952-05-26
GB701925A (en) 1954-01-06
CH290732A (fr) 1953-05-15
FR1015901A (fr) 1952-10-28

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