US2235767A - Magnetron tube - Google Patents

Magnetron tube Download PDF

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Publication number
US2235767A
US2235767A US232027A US23202738A US2235767A US 2235767 A US2235767 A US 2235767A US 232027 A US232027 A US 232027A US 23202738 A US23202738 A US 23202738A US 2235767 A US2235767 A US 2235767A
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US
United States
Prior art keywords
magnetic field
anode
magnetron
cathode
output
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
US232027A
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English (en)
Inventor
David G C Luck
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.)
RCA Corp
Original Assignee
RCA Corp
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
Priority to NL58124D priority Critical patent/NL58124C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US232027A priority patent/US2235767A/en
Application granted granted Critical
Publication of US2235767A publication Critical patent/US2235767A/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
    • 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

Definitions

  • My invention relates to magnetron tubes and moreparticularly to a method and means for coupling an output or load circuit to a thermionic tube of the magnetron type.
  • Thermionic tubes which are used for amplifying, generating oscillations, and the like, are provided with input and output electrodes.
  • a grid is usually utilized as the input electrode and a plate or anode is utilized as the output elec- 10 trode.
  • grid and anode electrodes may be used also.
  • end plates or other auxiliary electrodes, are utilized either as input or output electrodes.
  • auxiliary electrodes are utilized either as input or output electrodes.
  • the output or load circuit is connected in series with, or directly to, one of the electrodes.
  • Figure 1 is a perspective View of a magnetron employing an output circuit in accordance with my invention
  • Figure 2 is a schematic diagram showing the device illustrated in Figure 1 and connections therefor;
  • Figure 3 is a schematic drawing of an alternative method of controlling the electron flow in a magnetron.
  • Fig. 1 illustrates a magnetron of the single anode type.
  • the tube consists of a cathode 5 which passes through a cylindrical anode 1, concentrically arranged about the cathode.
  • a magnetic field substantially parallel to the axis of the cathode is produced by any suitable means, such as a horseshoe magnet 9, or the like.
  • the cathode and anode electrodes are suitably mounted within a glass envelope II.
  • a solenoid I3 is placed aroundthe glass envelope and is con- 1 centric with the anode electrode.
  • a grid may be included in the tube structure, and may, for example, take the form of a helix I5 which is positioned concentrically about the cathode. No attempt has been made in the drawing to illustrate the method of mounting the various electrodes within the glass envelope, as this is well known to those skilled in the art.
  • the dotted line spiraling out from the cathode indicates the course of electrons due to the presence of the magnetic field. This action is well known and need not be described herein.
  • Fig. 2 illustrates a preferred embodiment of my invention.
  • a magnetron constructed in the manner described with respect to the illustration ofFig. lis reproduced in Fig. 2.
  • circuit connections are shown to illustrate how a device of this character may be utilized to amplify alternating currents.
  • the cathode is energized by a battery I! or the like.
  • the negative terminal of the battery is connected to ground.
  • a high positive potential is applied to the anode l by a battery is which is connected between the anode and ground.
  • the input voltage from a source which is not shown, is connected to a pair of input terminals 2i.
  • One of the input terminals is connected to ground and the other is connected to the grid It.
  • the output is taken from a pair of terminals 23 which are connected respectively to the two terminals of a solenoid l3 which surrounds the magnetron.
  • a variable condenser 25, or the like, is connected across the solenoid l3, for the purpose of tuning it to resonance.
  • This device may well be compared to the operation of a transformer.
  • the current flowing from anode to cathode follows a rotating path due to the repeated rotation of the electrons about the cathode. This current is comparable to the current through the primary turns of a transformer.
  • the resultant magnetic field passes through the outer solenoid and will induce a voltage therein when the intensity of the magnetic field is varied. As pointed out.
  • the magnetic field may be varied by applying a control voltage to the grid electrode or by varying the anode potential. Other conditions being equal, the maximum output is obtained if the output circuit is resonant at the frequency of the input voltage.
  • Magnetrons of the usual type which employ a cylindrical anode must be slightly modified in order to permit the most efficient operation of my invention.
  • the anode electrode is positioned between the rotating electrons and the output solenoid. To prevent the anode from acting as a short-circuited turn, it is necessary to provide an axial slit in the anode. This is illustrated by the silt 21 which appears in the drawing.
  • Fig. 3 is a schematic drawing to illustrate the application of a control Voltage to the anode electrode in a magnetron which does not utilize a control grid.
  • the frequency of the input voltage may vary over a wide range. Amplification will take place at audio or radio frequencies. While I have illustrated my invention by a device which has been described as an amplifier, my invention is not so limited.
  • the output circuit may then be utilized to couple the oscillations which are so generated to the load circuit.
  • the high frequency output may be modulated in any well known manner, as by varying the grid voltage.
  • a magnetron having cathode and anode electrodes, means for producing a steady magnetic field substantially parallel to the axis of said electrodes,
  • a magnetron having a cathode, a grid, and a concentric cylindrical anode electrode, means for producing a magnetic field parallel to the axis of said cathode, an input circuit, an output circuit, means connecting said input circuit to said grid electrode, and an output solenoid positioned concentrically about said anode electrode and connected solely to said output circuit.
  • means for creating a rotating component of anode current to produce a secondary axial magnetic field means for varying the intensity of said secondary magnetic field, and means solely responsive to variations of said secondary magnetic field for coupling a load circuit to said magnetron.
  • a magnetron tube of the axial field type means for creating a rotating component of anode current to produce a secondary magnetic field, a control grid for varying said secondary field, a load circuit, and means solely responsive to the variations of said secondary field for coupling said load circuit to said magnetron.
  • the method of extracting energy from an electron discharge device which includes the steps of producing a first magnetic field perpendicular to the normal electron flow to cause said electrons to rotate about an axis substantially parallel to said field, and deriving output currents solely from the magnetic field produced by said rotating electrons.
  • the method of extracting energy from an electron discharge device which includes the steps of producing a first magnetic field perpendicular to the normal electron flow to cause said electrons to rotate about an axis substantially parallel to said first field, varying the secondary magnetic field produced by said rotating electrons, and deriving output currents solely from variations in said secondary magnetic field.
  • the method of extracting energy from an electron discharge device which includes the steps of producing a first magnetic field perpendicular to the normal electron flow to cause said electrons to rotate about an axis substantially parallel to said first field, varying the secondary magnetic field produced by said rotating electrons in accordance with a signal, and deriving output currents solely from the variations of said secondary magnetic field.
  • an electron discharge device having a thermionic cathode and an anode
  • the method of operation which includes the steps of producing a fixed magnetic field whose'lines' of force are perpendicular to the normal electron flow between said cathode and anode-electrodes tocause said electrons to follow circulatory paths before striking said anode, varying the paths of said electrons in accordance with a signal, and deriving output currents solely from the resulting variation in the secondary magnetic field proucked by said electrons.

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  • Microwave Tubes (AREA)
US232027A 1938-09-28 1938-09-28 Magnetron tube Expired - Lifetime US2235767A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL58124D NL58124C (en(2012)) 1938-09-28
US232027A US2235767A (en) 1938-09-28 1938-09-28 Magnetron tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US232027A US2235767A (en) 1938-09-28 1938-09-28 Magnetron tube

Publications (1)

Publication Number Publication Date
US2235767A true US2235767A (en) 1941-03-18

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ID=22871587

Family Applications (1)

Application Number Title Priority Date Filing Date
US232027A Expired - Lifetime US2235767A (en) 1938-09-28 1938-09-28 Magnetron tube

Country Status (2)

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US (1) US2235767A (en(2012))
NL (1) NL58124C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816224A (en) * 1953-12-21 1957-12-10 Nat Union Electric Corp Signal storage device of the magnetron type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816224A (en) * 1953-12-21 1957-12-10 Nat Union Electric Corp Signal storage device of the magnetron type

Also Published As

Publication number Publication date
NL58124C (en(2012))

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