US3536953A - Resonant cavity magnetron with mode suppressing short circuit connections - Google Patents

Resonant cavity magnetron with mode suppressing short circuit connections Download PDF

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Publication number
US3536953A
US3536953A US775606A US3536953DA US3536953A US 3536953 A US3536953 A US 3536953A US 775606 A US775606 A US 775606A US 3536953D A US3536953D A US 3536953DA US 3536953 A US3536953 A US 3536953A
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United States
Prior art keywords
resonant cavity
short circuit
mode
circuit connections
connections
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Expired - Lifetime
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US775606A
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English (en)
Inventor
Johannes Antonius Van De Goor
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US Philips Corp
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US Philips Corp
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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
    • 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
    • H01J23/22—Connections between resonators, e.g. strapping for connecting resonators of a magnetron

Definitions

  • the invention relates to a resonant cavity magnetron in which resonant cavities are formed by substantially flat anode vanes the end faces of which which face the oathode constitute the anode segments and in which annular equipotential connections which are located near to each other connect points located near the cathode on the axial end faces of alternate anode vanes in one or both end spaces.
  • the (1r1) mode is the mode which in frequency is located nearest to the 1r-mode and which occurs in doublet.
  • interruptions in equipotential connections which are distributed axially between the anode vanes.
  • the parts of the interrupted connection adjoining the interruption are then both connected to an anode segment so that in addition to the interrupted connection a bridged resonant cavity is obtained.
  • magnetrons for continuous operation for example, for high-frequency heating
  • said measures are generally insufficient particularly in connection with the higher average powers and the high standing wave ratio which usually occurs.
  • these magnetrons often have to operate with a supply having an unfiltered single phase or two-phase rectified mains voltage, so that, when the vr-mode does not occur immediately, the danger exists that the anode voltage increases to the higher value which is favourable for the (1r-1) mode.
  • the edge steepness of the supply voltage is a few orders of magnitude 3,536,953 Patented Oct. 27, 1970 lower than in magnetrons for radar, these generally operate with a considerably lower standing wave ratio.
  • a resonant cavity magnetron in which the resonant cavities are constituted by substantially flat anode vanes the end faces of which face the cathode constitute the anode segments and in which annular equipotential connections which are located near to each other connects points located near the cathode on the axial end faces of alternate anode vanes in one or both end spaces, short circuit connections are provided in the end spaces on the axial end faces of the anode segments of one or more resonant cavities which are located at an angle of approximately 45 or with the output line of the magnetron, said short circuit connections being located substantially centrally between the equipotential connections and the outside of the anode vanes.
  • the angle between the coupling-out line and the bridged resonant cavities also determines the frequency of the doublet of the (1rl) mode and the radial position of the bridge determines whether the two doublets are coupled out to a more or less equal extent.
  • the number of short circuit connections in one end space may be equal to one single or two connections located diametrically opposite to each other of four connections located 2 by 2 diametrically opposite to each other at diameters intersecting at right angles. If required, another four may be provided in the other space.
  • Reference numeral 1 in the figure denotes the copper anode block in which 20 copper anode vanes 2 are soldered.
  • the axial ends of the vanes are profiled so that they alternately contact the copper equipotential connections 3 and 4.
  • the output line of the magnetron is a coaxial system 5, 6 the inner conductor 6 of which terminates on a transverse brace 7 which terminates on the outermost anode vanes of two adjacent resonant cavities.
  • the resonant cavity 8 which is arranged at an angle of 45 with the output is bridged by a copper brace 9.
  • a second brace 10 may also be provided or in addition two braces 11 and 12. If required, the system of the four braces may also be provided in the other end space.
  • a resonant cavity magnetron comprising an annular block having a plurality of symmetrically positioned inwardly projecting spaced vanes defining resonant cavities therebetween, a concentrically positioned cathode within said annular block spaced from the ends of said vanes, means connecting alternate vanes adjacent their ends facing the cathode to provide equipotential connections thereto, output means connected to the ends of selected vanes at their ends remote from the cathode, and at least one short circuit connection between two adjacent vanes between the equipotential connections and the ends remote from the cathode positioned at an angle of substantially 45 or 135 with the output means.
  • a resonant cavity magnetron as claimed in claim 1 References Cited characterized in that only one short circuit connection is UNITED STATES PATENTS provided at an angle of 45 with the output line.

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  • Microwave Tubes (AREA)
US775606A 1967-11-24 1968-11-14 Resonant cavity magnetron with mode suppressing short circuit connections Expired - Lifetime US3536953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6715979A NL6715979A (xx) 1967-11-24 1967-11-24

Publications (1)

Publication Number Publication Date
US3536953A true US3536953A (en) 1970-10-27

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ID=19801807

Family Applications (1)

Application Number Title Priority Date Filing Date
US775606A Expired - Lifetime US3536953A (en) 1967-11-24 1968-11-14 Resonant cavity magnetron with mode suppressing short circuit connections

Country Status (5)

Country Link
US (1) US3536953A (xx)
DE (1) DE1806058A1 (xx)
FR (1) FR1592846A (xx)
GB (1) GB1249893A (xx)
NL (1) NL6715979A (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792306A (en) * 1972-12-04 1974-02-12 Raytheon Co Multisignal magnetron having plural signal coupling means
US4028583A (en) * 1975-08-07 1977-06-07 Atomic Energy Of Canada Limited High power-double strapped vane type magnetron
US4129834A (en) * 1977-01-17 1978-12-12 U.S. Philips Corporation Resonant cavity magnetron with choke structure for reducing harmonics in output system
US4365185A (en) * 1979-07-14 1982-12-21 English Electric Valve Company Limited Magnetron having three alternatingly connected straps
US5211776A (en) * 1989-07-17 1993-05-18 General Dynamics Corp., Air Defense Systems Division Fabrication of metal and ceramic matrix composites
US5216327A (en) * 1991-12-19 1993-06-01 Raytheon Company Magnetron coaxial adaptor having a cap which fits over the magnetron output antenna
US6384537B2 (en) * 1999-08-25 2002-05-07 Northrop Grumman Corporation Double loop output system for magnetron

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5030655U (xx) * 1973-07-16 1975-04-05
JPS50126159A (xx) * 1974-03-22 1975-10-03

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860285A (en) * 1956-12-14 1958-11-11 Raytheon Mfg Co Electron discharge devices
US3121822A (en) * 1960-10-28 1964-02-18 Gen Electric Circuits for unimoding crossed field devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860285A (en) * 1956-12-14 1958-11-11 Raytheon Mfg Co Electron discharge devices
US3121822A (en) * 1960-10-28 1964-02-18 Gen Electric Circuits for unimoding crossed field devices

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792306A (en) * 1972-12-04 1974-02-12 Raytheon Co Multisignal magnetron having plural signal coupling means
US4028583A (en) * 1975-08-07 1977-06-07 Atomic Energy Of Canada Limited High power-double strapped vane type magnetron
US4129834A (en) * 1977-01-17 1978-12-12 U.S. Philips Corporation Resonant cavity magnetron with choke structure for reducing harmonics in output system
US4365185A (en) * 1979-07-14 1982-12-21 English Electric Valve Company Limited Magnetron having three alternatingly connected straps
US5211776A (en) * 1989-07-17 1993-05-18 General Dynamics Corp., Air Defense Systems Division Fabrication of metal and ceramic matrix composites
US5216327A (en) * 1991-12-19 1993-06-01 Raytheon Company Magnetron coaxial adaptor having a cap which fits over the magnetron output antenna
US6384537B2 (en) * 1999-08-25 2002-05-07 Northrop Grumman Corporation Double loop output system for magnetron

Also Published As

Publication number Publication date
FR1592846A (xx) 1970-05-19
DE1806058A1 (de) 1969-07-31
NL6715979A (xx) 1969-05-28
GB1249893A (en) 1971-10-13

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