US2348986A - Resonant cavity magnetron - Google Patents

Resonant cavity magnetron Download PDF

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Publication number
US2348986A
US2348986A US362487A US36248740A US2348986A US 2348986 A US2348986 A US 2348986A US 362487 A US362487 A US 362487A US 36248740 A US36248740 A US 36248740A US 2348986 A US2348986 A US 2348986A
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United States
Prior art keywords
anode
cavity
members
slits
resonant cavity
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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
US362487A
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English (en)
Inventor
Ernest G Linder
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
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Filing date
Publication date
Priority to NL63088D priority Critical patent/NL63088C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US362487A priority patent/US2348986A/en
Priority to US508348A priority patent/US2415253A/en
Application granted granted Critical
Publication of US2348986A publication Critical patent/US2348986A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relates to magnetrons and particularly to resonant cavity magnetrons in which the cavity acts as a tank circuit.
  • Magnetrons using a plurality of arcuate shape anodes, are well known.
  • the arcuate shape anodes are usually connected to tank circuits or in some devices the anodes themselves form the tank circuit as shown in Ernest G. Linders U. S. Patent No. 2,233,482 granted on March 4, 1941, for Anode tank circuit oscillators.
  • electrons under the influence of a magnetic field, travel along curved paths toward the anode. Some of the electrons give up their energy to initiate or reinforce oscillatory currents inthe tank circuit.
  • the anode electrode of a magnetron includes a slit or a plurality of slits.
  • a resonant cavity member also including a slit is attached to the anode so that a slit in the anode substantially coincides with the slit in the resonant cavity member.
  • some of the electrons deliver energy to reinforce or, establish within the cavity standing electromagnetic waves.
  • Fig. l is a perspective view of one embodiment of the invention
  • Figures 2a and 2b are plan and elevational views, respectively, of the anode and resonant cavity members employed in said one embodiment
  • Figure 3 is a graph illustrating the field distribution of the device of Fig. 1
  • Figure 4 is a schematic diagram of the circuit of the invention as applied to a detector
  • Figure 5 is a plan view of the electrode and cavity portion including phasing means
  • a substantially cylindrical anode 3 within an evacuated envelope l are mounted a substantially cylindrical anode 3 and a pair of substantially cylindrical members 5, i which each include a resonant cavity.
  • the anode includes longitudinal slits 9, ll;
  • anode and cavity members may be fabricated in any desired manner, and
  • a cathode 17 extends along the axis of the anode.
  • a magnetic field is established by a permanent magnet l5, eiectromagnet, or solenoid. If a permanent magnet is used, cylindrical or conical polepieces may be attached to increase the :dux which surrounds and is substantially parallel to the cathode.
  • the circuit connections are as follows:
  • the cathode is connected to a battery 25 and rheostat 23.
  • the anode is connected to the positive terminalof a battery 25 whose negative terminal is connected to the cathode circuit.
  • a pickup loop 21 is inserted through a suitable aperture 29 in one of the resonant cavities.
  • the pickup loop may be terminated in a load circuit, such as a dipole antenna.
  • the device may be used as a detector by means of the circuit shown in Fig. 4.
  • the pickup loop 3! is connected through a transmission line 33 to a dipole antenna 35.
  • the anode is connected through a. transformer primary 3l and battery 39 to the cathode circuit ll.
  • the secondary of the transformer is connected to a signal indi-v cator, such as telephone receivers 43.
  • the slitted anode arrangement may be used with a plurality of resonant cavity members as shownin Fig. 5.
  • the anode electrode includes four slits 41. While the resonant cavities may be of any suitable shape, such as a rectangle cav ity, cuneiform members 49 may be used. The apex of each member is slitted so that the memby a coupling loop.
  • bers may be Jointed to the anode so that each of the slits of the anode coincide with aslit in the apex of an attached resonant cavity member.
  • the resonant cavity members may be coupled.
  • the foregoing formula applies to a rectangular cavity in which the height has a'negligible eifect on wave length.
  • The'formula applies approximately to a wedge shape cavity in which the wedge angle is small.
  • the anode electrode is connected to the wedge shape cavity and effects its resonant wave length. In practice waves of varying length are applied to the cavity and their eflect determined by a p'robe inserted within the cavity.
  • the probe is connected to a resonance indicator.
  • the resonant wave length, or frequency may be thus determined accurately. Since the foregoing formula does not apply to cavities of other shapes, such as a cylindrical cavity, the probe method of determining resonance is preferred. In any event the calculations are only a guide; the exact resonance is determined by any desired method of measurement.
  • the invention has been described as a magnetron in which the anode includes longitudinal slits.
  • Resonant cavity members opening into the anode slits, are attached to the anode.
  • the out-of-phase electrons moving past the slits give up energy to establish and maintain within the resonant cavities standing electromagnetic waves.
  • the waves may be applied to a coupling loop, if the device is used as an oscillator or the currents in a load cricuit may be used to establish electric waves within the cavity. These waves are amplified or detected by the electrons spiralling within the anode electrode.
  • the waves in a plurality of cavities may be phased
  • the invention is not limited to any precise number of resonant cavities of any specific shape.
  • the resonant cavity may be adjusted to respond to any desired frequency by employing means for adjusting the size or shape of the cavity as disclosed in U. S. Patent No.
  • An ultra high frequency device including a cathode, a substantially cylindrical anode surrounding saici cathode and including longitudinal slits, a pair of members including in each a cylindraceous cavity resonator closed at its ends, said cavity resonator being effectively entirely closed to standing waves which are to be established therein, each of said members including a longitudinal slit opening into said cavity resonators respectively, and each of said members secured to said anode with one of said anode slits and one of the slits in said members substantially coinciding and said cavity resonator members mounted eccentrically with respect to said anode, and means adjacent said anode for creating a magnetic field having its lines of force substantially parallel to and surrounding the axis of said cylindrical anode.
  • An ultra high frequency device including a cathode, a substantially cylindrical anode surrounding said cathode and including longitudinal slits, a pair of cylindrical members including in each a cylind'raceous cavity resonator closed at its ends, said cavity resonator being effectively entirely closed to ultra high frequency standing waves which are to be established therein, each of said members including a longitudinal slit opening into said cavity resonator, and each of said members secured to said anode with one of said anode slits and one of the slits in said members coinciding and said anode and members mounted eccentrically, and means adjacent said anode for creating a magnetic field having its lines of force substantially parallel to and surrounding the axis of said cylindrical anode.
  • An ultra high frequency device including a cathode, a substantially cylindrical anode surrounding said cathode and including two diametrically opposed longitudinal slits, a pair of cylindrical members including in each a cylindraceous cavity resonator closed at its ends, said cavity resonator being effectively entirely closed to ultra high frequency standing waves

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US362487A 1940-10-24 1940-10-24 Resonant cavity magnetron Expired - Lifetime US2348986A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL63088D NL63088C (en, 2012) 1940-10-24
US362487A US2348986A (en) 1940-10-24 1940-10-24 Resonant cavity magnetron
US508348A US2415253A (en) 1940-10-24 1943-10-30 Cavity resonator magnetron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US362487A US2348986A (en) 1940-10-24 1940-10-24 Resonant cavity magnetron

Publications (1)

Publication Number Publication Date
US2348986A true US2348986A (en) 1944-05-16

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US362487A Expired - Lifetime US2348986A (en) 1940-10-24 1940-10-24 Resonant cavity magnetron

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US (1) US2348986A (en, 2012)
NL (1) NL63088C (en, 2012)

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415253A (en) * 1940-10-24 1947-02-04 Rca Corp Cavity resonator magnetron
US2415470A (en) * 1943-04-21 1947-02-11 Rca Corp Magnetron
US2416899A (en) * 1943-09-24 1947-03-04 Raytheon Mfg Co Electronic discharge device of the magnetron type
US2417789A (en) * 1941-12-01 1947-03-18 Raytheon Mfg Co Magnetron anode structure
US2419572A (en) * 1944-04-05 1947-04-29 Bell Telephone Labor Inc Electron discharge device
US2422465A (en) * 1943-02-02 1947-06-17 Gen Electric High-frequency magnetrons
US2429291A (en) * 1943-07-01 1947-10-21 Westinghouse Electric Corp Magnetron
US2433481A (en) * 1943-07-01 1947-12-30 Westinghouse Electric Corp Magnetron
US2434517A (en) * 1944-05-11 1948-01-13 Westinghouse Electric Corp Method of activating cathodes
US2444418A (en) * 1942-10-15 1948-07-06 Gen Electric High-frequency electronic device
US2452032A (en) * 1944-06-10 1948-10-26 Raytheon Mfg Co Electron discharge device of the magnetron type
US2452056A (en) * 1944-07-20 1948-10-26 Raytheon Mfg Co Electrical discharge device
US2452077A (en) * 1944-01-19 1948-10-26 Raytheon Mfg Co Electric discharge device
US2459195A (en) * 1945-03-03 1949-01-18 Raytheon Mfg Co Electron discharge device
US2462496A (en) * 1942-04-24 1949-02-22 Rca Corp Electron discharge device
US2463524A (en) * 1945-03-10 1949-03-08 Raytheon Mfg Co Electron discharge device
US2474898A (en) * 1944-04-05 1949-07-05 Bell Telephone Labor Inc Electromagnetic resonator of the magnetron type
US2476130A (en) * 1945-01-11 1949-07-12 Raytheon Mfg Co Electron discharge device of the magnetron type
US2481171A (en) * 1945-08-20 1949-09-06 Raytheon Mfg Co Electron discharge device
US2482541A (en) * 1945-05-12 1949-09-20 Gen Electric High-frequency electrical apparatus
US2497831A (en) * 1945-08-22 1950-02-14 Rca Corp Electron discharge device employing cavity resonators
US2508280A (en) * 1944-02-01 1950-05-16 "Patelhold" Patentverwertungs- & Elektro-Holding A.-G. Electron tube
US2530172A (en) * 1945-02-17 1950-11-14 Westinghouse Electric Corp Ultra high frequency generator
US2539337A (en) * 1945-03-07 1951-01-23 Raytheon Mfg Co Electron discharge device of the magnetron type
US2542899A (en) * 1944-11-30 1951-02-20 Raytheon Mfg Co Cavity resonator electron discharge device
US2548808A (en) * 1945-11-06 1951-04-10 Nathan P Nichols Continuous-strip anode for magnetrons
US2564005A (en) * 1945-06-23 1951-08-14 Halpern Julius Automatic frequency control system
US2591976A (en) * 1945-03-22 1952-04-08 Rca Corp Electron discharge device utilizing cavity resonators
US2595652A (en) * 1944-04-05 1952-05-06 Bell Telephone Labor Inc Coupled cavity resonator
US2617079A (en) * 1944-08-08 1952-11-04 Westinghouse Electric Corp Tunable magnetron
US2624862A (en) * 1945-05-09 1953-01-06 Everhart Edgar Tunable strapped magnetron
US2639403A (en) * 1945-02-27 1953-05-19 Us Sec War Strapped multicavity magnetron
US2747137A (en) * 1945-05-12 1956-05-22 Gen Electric High frequency electrical apparatus
US2762944A (en) * 1945-10-30 1956-09-11 Albert M Clogston Magnetic triode
US2831148A (en) * 1952-08-19 1958-04-15 M O Valve Co Ltd Resonant cavity magnetrons
US2832050A (en) * 1945-03-22 1958-04-22 Rca Corp Electron discharge devices

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415253A (en) * 1940-10-24 1947-02-04 Rca Corp Cavity resonator magnetron
US2417789A (en) * 1941-12-01 1947-03-18 Raytheon Mfg Co Magnetron anode structure
US2462496A (en) * 1942-04-24 1949-02-22 Rca Corp Electron discharge device
US2444418A (en) * 1942-10-15 1948-07-06 Gen Electric High-frequency electronic device
US2422465A (en) * 1943-02-02 1947-06-17 Gen Electric High-frequency magnetrons
US2415470A (en) * 1943-04-21 1947-02-11 Rca Corp Magnetron
US2429291A (en) * 1943-07-01 1947-10-21 Westinghouse Electric Corp Magnetron
US2433481A (en) * 1943-07-01 1947-12-30 Westinghouse Electric Corp Magnetron
US2416899A (en) * 1943-09-24 1947-03-04 Raytheon Mfg Co Electronic discharge device of the magnetron type
US2452077A (en) * 1944-01-19 1948-10-26 Raytheon Mfg Co Electric discharge device
US2508280A (en) * 1944-02-01 1950-05-16 "Patelhold" Patentverwertungs- & Elektro-Holding A.-G. Electron tube
US2419572A (en) * 1944-04-05 1947-04-29 Bell Telephone Labor Inc Electron discharge device
US2595652A (en) * 1944-04-05 1952-05-06 Bell Telephone Labor Inc Coupled cavity resonator
US2474898A (en) * 1944-04-05 1949-07-05 Bell Telephone Labor Inc Electromagnetic resonator of the magnetron type
US2434517A (en) * 1944-05-11 1948-01-13 Westinghouse Electric Corp Method of activating cathodes
US2452032A (en) * 1944-06-10 1948-10-26 Raytheon Mfg Co Electron discharge device of the magnetron type
US2452056A (en) * 1944-07-20 1948-10-26 Raytheon Mfg Co Electrical discharge device
US2617079A (en) * 1944-08-08 1952-11-04 Westinghouse Electric Corp Tunable magnetron
US2542899A (en) * 1944-11-30 1951-02-20 Raytheon Mfg Co Cavity resonator electron discharge device
US2476130A (en) * 1945-01-11 1949-07-12 Raytheon Mfg Co Electron discharge device of the magnetron type
US2530172A (en) * 1945-02-17 1950-11-14 Westinghouse Electric Corp Ultra high frequency generator
US2639403A (en) * 1945-02-27 1953-05-19 Us Sec War Strapped multicavity magnetron
US2459195A (en) * 1945-03-03 1949-01-18 Raytheon Mfg Co Electron discharge device
US2539337A (en) * 1945-03-07 1951-01-23 Raytheon Mfg Co Electron discharge device of the magnetron type
US2463524A (en) * 1945-03-10 1949-03-08 Raytheon Mfg Co Electron discharge device
US2591976A (en) * 1945-03-22 1952-04-08 Rca Corp Electron discharge device utilizing cavity resonators
US2832050A (en) * 1945-03-22 1958-04-22 Rca Corp Electron discharge devices
US2624862A (en) * 1945-05-09 1953-01-06 Everhart Edgar Tunable strapped magnetron
US2482541A (en) * 1945-05-12 1949-09-20 Gen Electric High-frequency electrical apparatus
US2747137A (en) * 1945-05-12 1956-05-22 Gen Electric High frequency electrical apparatus
US2564005A (en) * 1945-06-23 1951-08-14 Halpern Julius Automatic frequency control system
US2481171A (en) * 1945-08-20 1949-09-06 Raytheon Mfg Co Electron discharge device
US2497831A (en) * 1945-08-22 1950-02-14 Rca Corp Electron discharge device employing cavity resonators
US2762944A (en) * 1945-10-30 1956-09-11 Albert M Clogston Magnetic triode
US2548808A (en) * 1945-11-06 1951-04-10 Nathan P Nichols Continuous-strip anode for magnetrons
US2831148A (en) * 1952-08-19 1958-04-15 M O Valve Co Ltd Resonant cavity magnetrons

Also Published As

Publication number Publication date
NL63088C (en, 2012)

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