US3774119A - A.c. powered dual magnetron structure for independently generating two frequencies - Google Patents

A.c. powered dual magnetron structure for independently generating two frequencies Download PDF

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Publication number
US3774119A
US3774119A US00163699A US3774119DA US3774119A US 3774119 A US3774119 A US 3774119A US 00163699 A US00163699 A US 00163699A US 3774119D A US3774119D A US 3774119DA US 3774119 A US3774119 A US 3774119A
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United States
Prior art keywords
wave guide
oscillatory
magnetron
cathodes
systems
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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
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US00163699A
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English (en)
Inventor
B Mashin
I Sokolov
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Individual
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Individual
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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
    • 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

  • Two multi-cavity anode blocks together with the cathodes make up two oscillatory systems having independent oscillator resonant frequencies and are arranged so that their axes are parallel.
  • the output arrangement may incorporate a wave guide impedance transformer ensuring independent operation of the two oscillatory systems at their resonant frequencies.
  • the wave guide impedance transformer is expediently located at right angles to a plane containing the axes of the oscillatory systems.
  • cathodes are arranged both on the same axis of the magetron, one above the other.
  • One of the disadvantages is a very longinteraction space along the axis and, as a consequence, a large magnetic gap.
  • this prior-art magnetron has one anode because of which it acts as a single oscillatory system irrespective of the number of cathodes provided, and the power output of this magnetron is netic field of the magnetron by utilizing the rectified anode current of its oscillatory systems.
  • the mean output power is practically independent of the magnitude and phase of the r.f. load. This is explained by the fact that the reflected waves in the two osillatory systems are opposite in phase so that a decrease in the power output of one oscillatory system will bemade up for by an increase in the power output of the other.
  • the microwave spectrum is a quazi-noise type owing to the electron frequency shift.
  • the r.f. voltage will be distributed uniformly without any additional contrivances in practically-any working chamber, irrespective of its size and shape.
  • An object of the present invention is to avoid these disadvantages.
  • a particular object of the invention is to provide an a.c.-powered magnetron comprising at least two oscillatory systems each of which has a multi-cavity anode structure and a cathode of its own and'anoutput arrangement such that both oscillatory systems can operate independently into a common r.f. load and the output power depends very little on variations in the magnitude and phase of the r.f. load.
  • an a.c.-powered magnetron comprising cathodes are, according to the invention, placed in central chambers of multi-cavity anode blocks disposed so that their axes are parallel, and the said anode blocks together with said cathodes make up two oscillatory systems operating at different resonant frequencies, while the output arrangement comprises an impedance transformer which ensures independent operation of the two oscillatory systems at their resonant frequencies and is placed at right angles to a plane containing the axes of the oscillatory systems.
  • the oscillatory systems to an r.f. load by a segment of rectangular waveguide and U- shaped coupling slots of the impedance transformer located at opposite broad walls of the waveguide so that the input plane of a coupling slot of each oscillatory system is the short-circuit plane at the frequency of the' other oscillatory system.
  • the magnetron disclosed herein will operate reliably when powered, for example, in a pushpull manner from a transformer the centre tap' on the secondary winding of which is earthed either solidly or via the coil of an electromagnet which seats up the'operating magat least two cathodes and an-output arrangement, the I
  • the magnetron disclosed herein is simple in design and to make, and an oscillator built around this magnetron is simple and reliable in operation.
  • a magnetron comprises an anode block 1 incorporating two oscillatory systems 2 the anodes of which may, for example, be of laminated construction, with double two-sided straps 3.
  • the cathodes 4 are held in place by cross-armsS and ceramic cylinders 6. High voltage supply is fed to the cathodes 4 by means of posts 8 into which the crossarms 5 are brazed.
  • the anode block structure 1 is cooled by water admitted into cooling ducts 9 milled in the anode block and hermetically sealed by a jacket 10.
  • the oscillatory systems 2 of the magnetron are coupled to an output arrangement 12 which comprises two U-shaped coupling slots 13 of an impedance transformer and a block 14 fastened to the envelope of the anode block 1 by screws 15 and brazing.
  • the magnetron is exhausted through an exhaust tube 16.
  • the vacuum seal of the output arrangement is not shown in the drawing.
  • the magnetron disclosed herein can give stable operation, it is important that one oscillatory system should not affect the other.
  • the input plane of the coupling slot (on the waveguide side) of an adjacent section should be a short-circuit plane at the frequency of that oscillatory system which operates during a given half-cycle of the anode voltage.
  • the electrical length of the coupling slots should be chosen such that the length of the side arms of the output arrangement, treated an an E-plane tee, with the resonant cavities connected to them, will accommodate a whole number of half-wavelengths at the frequencies of the adjacent cavities.
  • any effect of one oscillatory system on the other will be completely eliminated, even though they may be oscillating simultaneously, which may, for example, occur for some time if the electromagnet placed in the anode circuit of the magnetron has a high inductance or when the magnetron is powered from a dc. anode supply.
  • a magnetron apparatus for producing highfrequency electrical output comprising: at least two cathodes disposed with their axes in spaced parallel relationship, and an output arrangement; an anode means including anode blocks each of which is disposed to surround each of said cathodes forming an oscillatory system therewith, a plurality of oscillatory systems so formed by said cathodes operating at different inherent resonant frequencies, said output arrangement having .wave guide means to feed said different inherent resonant frequencies into a common high-frequency load and an impedance transformer, said transformer being disposed at right angles to a plane containing said axes, which are the axes of the oscillatory systems, thereby ensuring independent and stable operation of said oscillatory systems.

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  • Microwave Tubes (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US00163699A 1971-07-02 1971-07-19 A.c. powered dual magnetron structure for independently generating two frequencies Expired - Lifetime US3774119A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NL7109134A NL7109134A (enrdf_load_stackoverflow) 1971-07-02 1971-07-02
FR7125039A FR2145079A5 (enrdf_load_stackoverflow) 1971-07-02 1971-07-08
GB3226871 1971-07-09
DE19712135701 DE2135701B2 (de) 1971-07-02 1971-07-16 Magnetron
US16369971A 1971-07-19 1971-07-19

Publications (1)

Publication Number Publication Date
US3774119A true US3774119A (en) 1973-11-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00163699A Expired - Lifetime US3774119A (en) 1971-07-02 1971-07-19 A.c. powered dual magnetron structure for independently generating two frequencies

Country Status (5)

Country Link
US (1) US3774119A (enrdf_load_stackoverflow)
DE (1) DE2135701B2 (enrdf_load_stackoverflow)
FR (1) FR2145079A5 (enrdf_load_stackoverflow)
GB (1) GB1315238A (enrdf_load_stackoverflow)
NL (1) NL7109134A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982152A (en) * 1974-11-25 1976-09-21 Raytheon Company Cascade crossed field device
US20120200223A1 (en) * 2010-12-29 2012-08-09 Thales Hyperfrequency wave generator device comprising a plurality of magnetrons
CN110534386A (zh) * 2019-09-05 2019-12-03 电子科技大学 一种轴向双结构双频输出微波炉用磁控管

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593067A (en) * 1947-02-13 1952-04-15 Raytheon Mfg Co High-frequency apparatus
US2895828A (en) * 1958-02-06 1959-07-21 Gen Electric Electronic heating methods and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593067A (en) * 1947-02-13 1952-04-15 Raytheon Mfg Co High-frequency apparatus
US2895828A (en) * 1958-02-06 1959-07-21 Gen Electric Electronic heating methods and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982152A (en) * 1974-11-25 1976-09-21 Raytheon Company Cascade crossed field device
US20120200223A1 (en) * 2010-12-29 2012-08-09 Thales Hyperfrequency wave generator device comprising a plurality of magnetrons
CN110534386A (zh) * 2019-09-05 2019-12-03 电子科技大学 一种轴向双结构双频输出微波炉用磁控管

Also Published As

Publication number Publication date
DE2135701B2 (de) 1977-12-29
DE2135701C3 (enrdf_load_stackoverflow) 1978-08-24
GB1315238A (en) 1973-05-02
DE2135701A1 (de) 1973-01-25
FR2145079A5 (enrdf_load_stackoverflow) 1973-02-16
NL7109134A (enrdf_load_stackoverflow) 1973-01-04

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