US3289035A - Reverse magnetron having means to suppress undersired modes - Google Patents

Reverse magnetron having means to suppress undersired modes Download PDF

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Publication number
US3289035A
US3289035A US216228A US21622862A US3289035A US 3289035 A US3289035 A US 3289035A US 216228 A US216228 A US 216228A US 21622862 A US21622862 A US 21622862A US 3289035 A US3289035 A US 3289035A
Authority
US
United States
Prior art keywords
cavity
circular electric
coupling
electric mode
modes
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
US216228A
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English (en)
Inventor
Drexler Jerome
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.)
SFD LAB Inc
S-F-D LABORATORIES Inc
Original Assignee
SFD LAB Inc
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
Application filed by SFD LAB Inc filed Critical SFD LAB Inc
Priority to US216228A priority Critical patent/US3289035A/en
Priority to US216227A priority patent/US3290548A/en
Priority to US219702A priority patent/US3255377A/en
Priority claimed from US221796A external-priority patent/US3223876A/en
Priority to US223499A priority patent/US3231781A/en
Priority to JP38040875A priority patent/JPS4945617B1/ja
Priority to GB31643/63A priority patent/GB1061711A/en
Priority to GB25074/66A priority patent/GB1061715A/en
Priority to GB25073/66A priority patent/GB1061714A/en
Priority to FR944394A priority patent/FR1372678A/fr
Publication of US3289035A publication Critical patent/US3289035A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for 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
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy

Definitions

  • the reverse magnetron tube of the present invention solves the aforementioned difiiculties associated with the prior art tube and provides a 32-35 gigacycle magnetron having a peak power output in the order of 290 kilowatts with average power output of approximately 50 watts while yielding overall efiiciencies of approximately 30% and a tunable bandwidth up to 12%.
  • This tube represents more than an order of magnitude increase in peak 3,289,035 Patented Nov. 29, 1966 lCC power output with approximately double the previously obtained efiiciency while having a long operating life in excess of 2,400 hours.
  • Another feature of the present invention is the provision of an axial rod centrally disposed of the circular electric mode cavity, said rod carrying the output coupling structure for facilitating axial translation of the coupling structure and tuning of the circular electric mode cavity.
  • FIG. 3 is a fragmentary view partly in cross-section and partly broken away of the portion of the structure of FIG. 2 taken along the line 33 in the direction of the arrows,
  • FIG. 5 is a cross-sectional mode diagram showing the TE circular electric mode of the cavity of FIG. 4,
  • FIG. 7 is a mode diagram showing the electric field lines for the TE mode in the cavity of FIG. 4.
  • a strong axial magetic field as of 12,000 to 15,000 gauss for the magnetron interaction region 8 is provided by a bowl shaped magnet '11, only partially shown in FIG. 2, enveloping the anode body portion 1 and having a re-entrant internal magnetic gap extending in the axial direction through the magnetron interaction region 8 between the magnetic pole pieces 12 disposed on opposite sides of the anode vanes 6.
  • the negative cathode potential of approximately 23 kv. is applied to the cathode emitter 9 via high voltage lead-in insulator assembly 4.
  • the cathode 9 uses a low voltage A.C. filament heater and therefore a dual wire cathode lead-in 10 is used.
  • the coupling disc 13 of FIGS. 2, 3 and 4 is replaced by a snowflake shape-d plate 25 :as shown in FIG. 6.
  • the elongated peripherally directed openings in the plate 25 between the radially directed members or points 26 of the snow-flake sha ed plate serve to couple the circular waveguide structure, and consequently the load, more (heavily to the non-circul-ar electric modes within the cavity, characterized by radially directed currents in the cavity end Walls 18 and This selective heavy coupling of the non-circular electric modes to the load serves to suppress these modes and prevent their sustained oscillation in the circular electric mode cavity 5.
  • the snowflake shaped coupling plate 25 has an odd number of connecting points 26. If the plate 25 has an even number of points 26, as for example six, then the undesired TE mode could align itself to minimize its coupling to the load.
  • a coupling device for wave energy communication between a hollow cavity resonator operating in a circular electric mode and a load including, a circular electric mode cavity resonator having an end wall, said end wall having an elongated coupling hole therethrough, a hollow circular electric mode wave supporting structure axially aligned with said coupling hole for wave communication between said cavity and the load, said elongated coupling hole being elongated in the circumferential direction of said cavity end wall to provide coupling to the desired circular electric mode while more heavily coupling the load to the undesired non-circular electric modesof said cavity having radial currents in said end wall to thereby load said undesired modes for suppression there of.

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  • Microwave Tubes (AREA)
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US216228A 1962-08-10 1962-08-10 Reverse magnetron having means to suppress undersired modes Expired - Lifetime US3289035A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US216228A US3289035A (en) 1962-08-10 1962-08-10 Reverse magnetron having means to suppress undersired modes
US216227A US3290548A (en) 1962-08-10 1962-08-10 Reverse magnetron
US219702A US3255377A (en) 1962-08-10 1962-08-27 Reverse magnetron with cathode support structure
US223499A US3231781A (en) 1962-08-10 1962-09-13 Reverse magnetron with slot mode absorber
JP38040875A JPS4945617B1 (enrdf_load_stackoverflow) 1962-08-10 1963-08-09
GB31643/63A GB1061711A (enrdf_load_stackoverflow) 1962-08-10 1963-08-09
GB25074/66A GB1061715A (en) 1962-08-10 1963-08-09 Electron-emitting cathode assemblies
GB25073/66A GB1061714A (en) 1962-08-10 1963-08-09 Magnetrons
FR944394A FR1372678A (fr) 1962-08-10 1963-08-10 Magnétron de type inversé

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR1372678T
US216228A US3289035A (en) 1962-08-10 1962-08-10 Reverse magnetron having means to suppress undersired modes
US219702A US3255377A (en) 1962-08-10 1962-08-27 Reverse magnetron with cathode support structure
US221796A US3223876A (en) 1962-09-06 1962-09-06 Cathode heater assembly for use in strong d.c. magnetic fields

Publications (1)

Publication Number Publication Date
US3289035A true US3289035A (en) 1966-11-29

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Family Applications (2)

Application Number Title Priority Date Filing Date
US216228A Expired - Lifetime US3289035A (en) 1962-08-10 1962-08-10 Reverse magnetron having means to suppress undersired modes
US219702A Expired - Lifetime US3255377A (en) 1962-08-10 1962-08-27 Reverse magnetron with cathode support structure

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Application Number Title Priority Date Filing Date
US219702A Expired - Lifetime US3255377A (en) 1962-08-10 1962-08-27 Reverse magnetron with cathode support structure

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US (2) US3289035A (enrdf_load_stackoverflow)
GB (3) GB1061715A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414761A (en) * 1965-09-16 1968-12-03 S F D Lab Dither tuner for a coaxial magnetron
US3458754A (en) * 1966-05-03 1969-07-29 Gen Electric Inverted cross field device having an arcuately segmented cathode
US8446096B1 (en) * 2009-10-02 2013-05-21 The United States Of America As Represented By The Secretary Of The Navy Terahertz (THz) reverse micromagnetron

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441792A (en) * 1966-07-08 1969-04-29 Sfd Lab Inc Reverse magnetron having a tie ring stiffening structure for its cathode support fingers
US3473072A (en) * 1967-03-01 1969-10-14 Nikolai Dmitrievich Ivano Mount for electric vacuum devices
US3805318A (en) * 1969-08-08 1974-04-23 R Marquette Brush cleaning device
US4620170A (en) * 1984-12-19 1986-10-28 Varian Associates, Inc. Means for liquid cooling a microwave window

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482495A (en) * 1943-11-27 1949-09-20 Westinghouse Electric Corp Magnetron
GB727742A (en) * 1951-06-07 1955-04-06 Csf Improvements in or relating to resonant cavity magnetrons
US2815469A (en) * 1951-01-08 1957-12-03 English Electric Valve Co Ltd Magnetron oscillators
US2951182A (en) * 1957-11-25 1960-08-30 Bell Telephone Labor Inc Magnetron

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335818A (en) * 1942-09-29 1943-11-30 Rca Corp Cathode assembly
NL141660B (nl) * 1947-07-31 Ventron Corp Werkwijze ter bereiding van een lichtgevoelig redoxsysteem.
CH309019A (de) * 1952-12-30 1955-08-15 Patelhold Patentverwertung Abstimmeinrichtung für Einkreis-Magnetron.
US3062982A (en) * 1959-12-31 1962-11-06 Gen Electric Electrode assembly support

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482495A (en) * 1943-11-27 1949-09-20 Westinghouse Electric Corp Magnetron
US2815469A (en) * 1951-01-08 1957-12-03 English Electric Valve Co Ltd Magnetron oscillators
GB727742A (en) * 1951-06-07 1955-04-06 Csf Improvements in or relating to resonant cavity magnetrons
US2951182A (en) * 1957-11-25 1960-08-30 Bell Telephone Labor Inc Magnetron

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3414761A (en) * 1965-09-16 1968-12-03 S F D Lab Dither tuner for a coaxial magnetron
US3458754A (en) * 1966-05-03 1969-07-29 Gen Electric Inverted cross field device having an arcuately segmented cathode
US8446096B1 (en) * 2009-10-02 2013-05-21 The United States Of America As Represented By The Secretary Of The Navy Terahertz (THz) reverse micromagnetron
US8624497B1 (en) 2009-10-02 2014-01-07 The United States Of America As Represented By The Secretary Of The Navy Terahertz (THz) reverse micromagnetron

Also Published As

Publication number Publication date
GB1061714A (en) 1967-03-15
GB1061715A (en) 1967-03-15
US3255377A (en) 1966-06-07
GB1061711A (enrdf_load_stackoverflow) 1967-03-15

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