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US2522184A - Magnetron - Google Patents

Magnetron Download PDF

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Publication number
US2522184A
US2522184A US696117A US69611746A US2522184A US 2522184 A US2522184 A US 2522184A US 696117 A US696117 A US 696117A US 69611746 A US69611746 A US 69611746A US 2522184 A US2522184 A US 2522184A
Authority
US
United States
Prior art keywords
high frequency
tube
cathode
oscillation
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
US696117A
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English (en)
Inventor
Ludi Fritz
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.)
Patelhold Patenverwertungs and Elektro-Holding AG
Original Assignee
Patelhold Patenverwertungs and Elektro-Holding AG
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 Patelhold Patenverwertungs and Elektro-Holding AG filed Critical Patelhold Patenverwertungs and Elektro-Holding AG
Application granted granted Critical
Publication of US2522184A publication Critical patent/US2522184A/en
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
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/14—Leading-in arrangements; Seals therefor
    • H01J23/15—Means for preventing wave energy leakage structurally associated with tube leading-in arrangements, e.g. filters, chokes, attenuating devices
    • 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
    • H01J25/56—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 with interdigital arrangements of anodes, e.g. turbator tube

Definitions

  • the present invention concerns a magnetron for generating ultra-short electromagnetic waves, an annular hollow body at least almost closed and bounded in a radial direction by two cylindrical casings being provided as the oscillation system, the cylindrical casing nearer to the axis being divided along the entire cylinder periphery into two parts by a tortuous slot. said two parts being at different alternating potential but at the same direct potential relative to the cathode located in the axis of the system.
  • the high frequency alternating field of the electron tube produces for instance by means of induction or inuence eiiect high. frequency currents in the tube parts, such as the cathode and the like, and. these currents cause a loss of high frequency energy. These losses can be ohmic or on the other hand they may be due to the radiation of high. frequency energy.
  • the present invention avoids these disadvantages land is characterised by the feature that at least a tube part which docs not belong to the tube oscillation circuit for determining the frequency and in which during operation high frequency currents occur, is connected to a lowradiation electrical oscillation system which is so tuned that the high frequency losses are at least approximately a minimum.
  • Fig. l shows a tube according to the invention in cross-section
  • Fig. 2 a constructional form of an oscillation system for reducing the losses and connected to the heating circuit system
  • Fig. 3 shows the combination of a loss-reducing oscillation system with a permanent magnet.
  • Fig. Il illustrates a modiiied form of the invention where the oscillation system is used simultaneously for extracting the high frequency energy.
  • Figs. c and 5b show two tube sections at right angles to each other.
  • Fig. l the cross-scction is taken Ialong a plane passing through the tube axis.
  • Reference numeral l indicates the electron-emitting hot cathode which in this case is in the form of a spiral
  • 2 is an annular cavity resonator of rec tangular cross-section at anode potential
  • 4 is an energy extracting vor collecting electrode.
  • the capacitive part of the cavity resonator is mainly formed by the segments 5 arranged next to each other in the circumferential direction.
  • the tube is loc-ated inside a glass vessel 25. The method of operation of the tube is already described in my copending application Serial No. tl7,533, filed March 5, 1943, and does not therefore need to be repeated again.
  • the leads for the heating current are constructed Lecher lines which are closed by a capacity E.
  • the Lecher line can be varied for instance by shifting the capacity l5 together with its leads 'l along the Lecher system 3.
  • the oscillation system comprising the Lecher system 3, capacity ii together with the leads l, and the cathode l, is according to the invention tuned in such a manner that the high frequency losses are a minimum. Tuning is not only possible by altering the electrically effective length of the Lecher line.
  • the capacitance of condenser 6 can also be varied.
  • the heating current for the cathode l is supplied over the side plates ll which serve to support the former. Ii the side plates and cathode are electrically separated from each other, it is ad- 'vis-able to tune both by means of special oscillation systems so as to reduce the high frequency losses to a minimum. Tuning for minimum high. ⁇ frequency losses is generally ⁇ achieved when the length of the Lecher line amounts to an uneven multiple of a quarter wave length of the prevailing oscillations, preferably equal to M4.
  • a screening pot i6 in the form of a concentric Lecher line short-circuited at one end is arranged in place of a tuned two-Wire Lecher line.
  • Screening pot I6 has a length of l/fl or an uneven multiple of same, )l being the Wave length of the electromagnetic oscillations of the magnetron tube. They screening not can be located inside or outside the tubevessel.
  • Fig. 3 shows a constructional form of the tube without glass vessel.
  • Reference numeral l' again indicates the cathode, 2 the cavity resonator, and 3, 6 the low-radiation tuneable oscillation system, Whilst 4 is the energy collecting electrode and 5 the anode segments; I1 are the poles of a magnet.
  • Fig. 5a the plane on which the cross-section is taken lies in the axis of the tube
  • Fig. 5b is a sectional View along a plane perpendicular to the tube axis.
  • 26 is a getter device.
  • System 23, 24 is again tuned in such a manner that the high frequency losses are a minimum, and the Lecher line 22 together with the variable capacitance 21 serves to tune the natural frequency.
  • Loop 2l serves for collecting the high frequency energy and passing it on to the consumer.
  • the frequency of the oscillations of the cavity resonator can be influenced by varying the tuning of the oscillation circuits. It is therefore advisable to make the impedance I8 variable.
  • the impedance i8 consists of a cavity resonator.
  • Another modified constructional form of the invention is obtained by substituting a tube arrangement, which acts as a variable condenser, for the capacitance 6 of Fig. 1, this tube being influenced for instance by altering the grid bias. This enables the tube oscillations to be modulated.
  • a magnetron for generating ultra-short electromagnetic waves comprising, within an evacuated envelope, a hollow cavity resonator having inner and outer cylindrical Walls connected by end walls, the inner cylindrical wall being divided into a plurality of parallel anode segments connected in alternation to the respective end walls, means for establishing a magnetic field within the cylindrical space defined by said anode segments and parallel to the axis thereof, a cathode extending through said cylindrical space and having an axis substantially parallel to the axis thereof, side plates arranged perpendicular to the axis of and spaced axially from the respective end walls of said cavity resonator, said cathode being electrically connected to and supported by said side plates, leads electrically connected to the respective side plates and extending to the exterior of said envelope, and a condenser connecting said leads and cooperating therewith to form a Lecher line non-resonant at the frequency of the generated oscillations.

Landscapes

  • Microwave Tubes (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US696117A 1942-02-09 1946-09-11 Magnetron Expired - Lifetime US2522184A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH616866X 1942-02-09

Publications (1)

Publication Number Publication Date
US2522184A true US2522184A (en) 1950-09-12

Family

ID=4523819

Family Applications (1)

Application Number Title Priority Date Filing Date
US696117A Expired - Lifetime US2522184A (en) 1942-02-09 1946-09-11 Magnetron

Country Status (6)

Country Link
US (1) US2522184A (de)
BE (1) BE478534A (de)
CH (2) CH224083A (de)
DE (2) DE972070C (de)
FR (2) FR892467A (de)
GB (1) GB616866A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609522A (en) * 1950-04-03 1952-09-02 Joseph F Hull Magnetron

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462137A (en) * 1946-02-26 1949-02-22 Raytheon Mfg Co Electron discharge device
DE1204334B (de) * 1954-06-22 1965-11-04 Raytheon Co Magnetron

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128235A (en) * 1934-10-11 1938-08-30 Meaf Mach En Apparaten Fab Nv Vacuum discharge tube
US2149024A (en) * 1934-11-28 1939-02-28 Rca Corp Electron discharge device and circuit for high frequency oscillations
US2157179A (en) * 1934-07-02 1939-05-09 Rca Corp Microwave oscillator and detector
US2163589A (en) * 1935-06-20 1939-06-27 Pintsch Julius Kg Electron tube
US2167201A (en) * 1935-06-28 1939-07-25 Pintsch Julius Kg Electron tube
US2207846A (en) * 1938-06-30 1940-07-16 Rca Corp Electronic discharge device
US2421636A (en) * 1944-05-29 1947-06-03 Gen Electric Tunable magnetron
US2432571A (en) * 1943-02-24 1947-12-16 Rca Corp Electron discharge device employing resonators

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE704248C (de) * 1933-06-13 1941-03-26 Rca Corp Magnetfeldroehre fuer ultrakurze Wellen mit ungeschlitzter Anode
DE699011C (de) * 1936-04-30 1940-11-21 Telefunken Gmbh Schlitzmagnetronanordnung zur Erzeugung kurzer Wellen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157179A (en) * 1934-07-02 1939-05-09 Rca Corp Microwave oscillator and detector
US2128235A (en) * 1934-10-11 1938-08-30 Meaf Mach En Apparaten Fab Nv Vacuum discharge tube
US2149024A (en) * 1934-11-28 1939-02-28 Rca Corp Electron discharge device and circuit for high frequency oscillations
US2163589A (en) * 1935-06-20 1939-06-27 Pintsch Julius Kg Electron tube
US2167201A (en) * 1935-06-28 1939-07-25 Pintsch Julius Kg Electron tube
US2207846A (en) * 1938-06-30 1940-07-16 Rca Corp Electronic discharge device
US2432571A (en) * 1943-02-24 1947-12-16 Rca Corp Electron discharge device employing resonators
US2421636A (en) * 1944-05-29 1947-06-03 Gen Electric Tunable magnetron

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609522A (en) * 1950-04-03 1952-09-02 Joseph F Hull Magnetron

Also Published As

Publication number Publication date
CH254464A (de) 1948-04-30
DE972125C (de) 1959-05-27
FR55009E (fr) 1951-06-05
CH224083A (de) 1942-10-31
DE972070C (de) 1959-05-21
BE478534A (de)
GB616866A (en) 1949-01-27
FR892467A (fr) 1944-04-07

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