US2659030A - Magnetron - Google Patents

Magnetron Download PDF

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Publication number
US2659030A
US2659030A US155575A US15557550A US2659030A US 2659030 A US2659030 A US 2659030A US 155575 A US155575 A US 155575A US 15557550 A US15557550 A US 15557550A US 2659030 A US2659030 A US 2659030A
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US
United States
Prior art keywords
helix
magnetron
cathode
anode
wires
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
US155575A
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English (en)
Inventor
Verweel Jan
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2659030A publication Critical patent/US2659030A/en
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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

Definitions

  • This invention relates to a magnetron comprising a number of anode segments which form part of a resonator system.
  • Magnetrons are known in which the resonator system is built up from anumber of resonant cavities which open into the slots between two neighbouring anode segments. Although the known magnetrons are capable of producing excellent results, they have a limitation in that their manufacture is difiicult and costly and thistends to make these structures unavailable for many uses.
  • a further object of the invention is to provide a magnetron anode structure ,which facilitates degassing of the magnetron.
  • a primary object of the invention is to provide a magnetron structure in which the anode comprises a plurality of anode segments forming a part of a resonator system.
  • the resonator system in a magnetron comprising a plurality of anode segments which form part of a resonator system the resonator system is constituted by a helix of conductive material, the shape of which helix is conformed with that of the cathode.
  • the length of each turn of the helix should not exceed onehalf the wavelength of the generated oscillations. If the length of a turn of the helix is equal to one-half the Wavelength of the generated oscillation the adjacent anode segments oscillate in phase opposition, this wavelength being the shortest wavelength which can be produced.
  • the magnetrons according to the invention may be constructed either with a fiat cathode opposite to which a straight helix is arranged or with a cylindrical cathode and a circular helix arranged to surround it coaxially.
  • the high-frequency energy may be taken from the helix by connecting two wires of a lecher wire system to two points of the helix which are comparatively close to one another. These wires may also serve as stay wires and according to the spacing between the points of attachment the helix may be interrupted between them so as to avoid the establishment of a short circuit for the lecher system.
  • the connection of the helix to the wires of the lecher system is chosen to be such that the impedance of the helix is conformed with the lecher system.
  • the anode may alternatively be supported by a system of two coaxial conductors, which are connected to the helix at a suitable point.
  • the helix maybe made from a thin, hollow pipe of suitable metal, so that use may be made of liquid cooling, the liquid being supplied through the; lecher wires mentioned hereinbefore.
  • a coupling loop may be used ending in a waveguide.
  • supplementary connections may be provided between difierent points of the helix. If the turns of the helix are equal to a half-wave length of the generated oscillations, for example, the center of the side of the helix remote from the cathode may be provided with a conductor which connects together all the turns on this side of the helix, since the high-frequency voltage of these points of the turns is equal to zero with the manner of oscillation indicated.
  • the natural frequency of the magnetron varies with the dimensions of the helix, it may be readily controlled by adjustment of the temperature of the magnetron, for instance by heating the anode with an electric current.
  • Fig. 1 is a sectional view of the magnetron of invention taken at right angles to the axis of the electrode system;
  • Fig. 2 is a sectional view of the magnetron taken on line 11-11 of Fig. l and Fig. 3 shows another embodiment of the anode of invention in which the turns of the helix are connected together on the side of the anode remote from the cathode.
  • Figs. 4 and 5 show different views of a magnetron according to the invention having a flat cathode.
  • Fig. 6 shows a completely circular anode in which the energy is led away by a coupling loop.
  • the numeral [0 designates generally a magnetron having a glass base portion I and a bulb portion 2.
  • a cylindrical cathode 4 is secured to support wires 3 fixedly positioned in the base I and which wires also function as lead-in conductors.
  • a circular helix 6 Surrounding the cathode 4 is a circular helix 6 which constitutes the anode of the tube system.
  • This helix 6 may consist simply of fine wire, or may be a hollow pipe through which a cooling liquid may be circulated to facilitate cooling of the structure.
  • N and S are the magnetic pole pieces.
  • the bulb 2 at the level of the electrode system may have a narrowed part 1 In Figs. 4 andffi. the flatcathode is indicated by 13, the straight helix l2 being the anode.
  • N and S are the over shaped pole pieces.
  • the anode 6 is a completely closed circular helix.
  • a coupling loop 9 ends in a wave guide H.
  • a monocrystal tungsten wire was wound on A a, rectangular mandril of 5 x 3 mms. dimensions with a pitch of about 1 mm. and put aroundata diameter of 7 mms., the parts of the helix facing the cathode being directed as far as possible -par-- allel to the axis of the cathode.
  • the cathode had a diameter of 4 mms. At the wave length of 3 cms. even several kilowatts of pulse energy could be obtained with this arrangement.
  • a magnetron comprising a cathode, a plurality of anode segments constituting a portion of a resonating" system and comprising a helix of conductive material, the axis of said helix encircling the cathode, each turn of the helix being equidistant from the cathode and constituting one of said anode segments, a conductor connecting the midpoints of the turns of the helix on the side remot e from, the cathode and means adjacent to said helix to produce a magnetic field traversing the helix.

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  • Microwave Tubes (AREA)
US155575A 1949-05-13 1950-04-13 Magnetron Expired - Lifetime US2659030A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL283560X 1949-05-13

Publications (1)

Publication Number Publication Date
US2659030A true US2659030A (en) 1953-11-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
US155575A Expired - Lifetime US2659030A (en) 1949-05-13 1950-04-13 Magnetron

Country Status (7)

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US (1) US2659030A (US08124317-20120228-C00026.png)
BE (1) BE495667A (US08124317-20120228-C00026.png)
CH (1) CH283560A (US08124317-20120228-C00026.png)
DE (1) DE820940C (US08124317-20120228-C00026.png)
FR (1) FR1017426A (US08124317-20120228-C00026.png)
GB (1) GB676914A (US08124317-20120228-C00026.png)
NL (2) NL146431B (US08124317-20120228-C00026.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313343A (en) * 1996-05-20 1997-11-26 Reuters Ltd A keyboard having keycaps with transparent front faces

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1417912A (en) * 1916-06-24 1922-05-30 Hewitt Peter Cooper Vacuum electric apparatus
DE426053C (de) * 1926-03-08 Siemens & Halske Akt Ges Entladungsroehre
US1987989A (en) * 1929-12-03 1935-01-15 Western Electric Co Short wave oscillation generator
US2009369A (en) * 1931-06-24 1935-07-23 Rca Corp Oscillation generation
DE663309C (de) * 1934-10-30 1938-08-04 Telefunken Gmbh Kurzwellenroehre mit Kathode und konzentrisch dazu angeordneter einteiliger Anode
US2266411A (en) * 1938-05-27 1941-12-16 Int Standard Electric Corp Electron tube
US2521556A (en) * 1946-11-20 1950-09-05 Gen Electric Magnetron

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE426053C (de) * 1926-03-08 Siemens & Halske Akt Ges Entladungsroehre
US1417912A (en) * 1916-06-24 1922-05-30 Hewitt Peter Cooper Vacuum electric apparatus
US1987989A (en) * 1929-12-03 1935-01-15 Western Electric Co Short wave oscillation generator
US2009369A (en) * 1931-06-24 1935-07-23 Rca Corp Oscillation generation
DE663309C (de) * 1934-10-30 1938-08-04 Telefunken Gmbh Kurzwellenroehre mit Kathode und konzentrisch dazu angeordneter einteiliger Anode
US2266411A (en) * 1938-05-27 1941-12-16 Int Standard Electric Corp Electron tube
US2521556A (en) * 1946-11-20 1950-09-05 Gen Electric Magnetron

Also Published As

Publication number Publication date
DE820940C (de) 1951-11-15
FR1017426A (fr) 1952-12-10
NL146431B (nl)
BE495667A (US08124317-20120228-C00026.png)
NL71310C (US08124317-20120228-C00026.png)
GB676914A (en) 1952-08-06
CH283560A (de) 1952-06-15

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