US2642551A - High-frequency magnetron - Google Patents

High-frequency magnetron Download PDF

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Publication number
US2642551A
US2642551A US160749A US16074950A US2642551A US 2642551 A US2642551 A US 2642551A US 160749 A US160749 A US 160749A US 16074950 A US16074950 A US 16074950A US 2642551 A US2642551 A US 2642551A
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United States
Prior art keywords
resonators
magnetron
vanes
cathode
slots
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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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US160749A
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English (en)
Inventor
Charles V Litton
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Individual
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Individual
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Filing date
Publication date
Priority to NL77788D priority Critical patent/NL77788C/xx
Priority to NL7403300.A priority patent/NL161075C/xx
Application filed by Individual filed Critical Individual
Priority to US160749A priority patent/US2642551A/en
Priority to GB5111/51A priority patent/GB686499A/en
Priority to DEI4103A priority patent/DE893062C/de
Priority to FR1036851D priority patent/FR1036851A/fr
Application granted granted Critical
Publication of US2642551A publication Critical patent/US2642551A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/18—Resonators
    • H01J23/22—Connections between resonators, e.g. strapping for connecting resonators of a magnetron

Definitions

  • This invention relates to generators of ultrahigh frequency and particularly to magnetrons constructed to produce a large amount of power at the ultra high frequencies.
  • the power available from a magnetron may be increased if a plurality of magnetrons are stacked together or if a single magnetron is increased in size. With an increase in size or in frequency of oscillations, undesired and extraneous modes occur more readily, which may be eliminated if one provides slots in the anode structure which dei-mes the cavity resonators of the magnetron. These slots are arranged at predetermined points spaced along the length of the anode structure in a direction parallel to the magnetron cathode which is coaxially mounted with respect to the cavity resonators.
  • These slots prevent ultra high frequency waves from developing in the resonators in certain extraneous modes and particularly in those modes in which the electric field component is parallel to the axis of the magnetron. In particular they eliminate the longitudinal mode of operation of the magnetron by preventing current from flowing in an axial direction along the edges of the vanes or partitions which implemente the cavity resonators of the magnetron.
  • An example of such slots is given in the U. S. Patent No. 2,450,023 issued to Spencer.
  • I carry out the above-mentioned objects by providing a slot a quarter wave length long at the operating frequency in each vane or partition which defines the cavity resonators of the magnetron and I further provide an electromagnetic wave coupling path between at least a pair of adjacent resonators in the magnetron for locking the resonators into operation in the desired mode.
  • the method of connection serves deliberately to reenforce a push-pull mode, which naturally wants to come in as'the anode is made axially longer.
  • the sections individually operate with constant elds but theslots permit a phase reversal at appropriateY points along the anode.
  • the slots and feedback loop re-enforce the tendency and a very stable long-anode configuration results.
  • the system will couple eic'iently to the electron lstream. It is noted that the cathode may need a ring mounted on it in the plane of the slots to maintain high electronic eiiiciency and low back bombardment.
  • Figure l is a diagrammatic perspective view of a pair of adjacent resonators of a magnetron incorporating an embodiment of my invention
  • Figure 2 is a longitudinal sectional view of'a magnetron incorporating features of my invention
  • Figures 3 and 4 are cross sectional and side views of the magnetron of Figure 2;
  • Figure 5 is a diagrammatic perspective view of a pair of adjacent cavity resonators of a magnetron illustrating a further embodiment of my invention.
  • further mode stabilizing means in the form of a coupling between the upper half of one cavity resonator and the lower half of an adjacent cavity resonator.
  • the coupling path 'I is made an integral multiple of a half wave length long at the operating frequency and if it is coupled into each of the cavity resonators as discussed in my copending application mentioned above with or without phase reversal depending on whether the length is an odd or even multiple of a quarter Wave length, the coupling path will tend to lock the coupled portions of the adjacent cavity resonators into in-phase operation.
  • the coupling path will tend to lock the coupled portions of the adjacent cavity resonators into in-phase operation.
  • ultra-high frequency current will be flowing in the end wall from vane 2 to vane I at a given instance of time.
  • the electromagnetic wave path 'I is an integral multiple of a half wave length long at the operating frequency and coupled into the resonators as discussed above, no current will ow through it and hence no energy will be transferred from the upper part of the resonator between vanes I and 3 to the lower part of the resonator between vanesl 2 and 3 when they are operating in the same mode. If they tend to oscillate in different modes coupling path 'I will cause ultra-high frequency energy to be transferred between the two cavity resonators so that they are pulled back into oscillation in the desired mode.
  • FIGS. 2 through 4 show in detail the structure of a magnetron embodying the quarter wave length slot and the electromagnetic coupling means between resonators of the magnetron.
  • vanes I0 mounted coaxially inside of eight vanes I0.
  • the vanes I0 are arranged radially about the cathode 9 and form cavity resonators with the cylindrical end wall II.
  • the vanes are provided with strap pairs I2 and I3 one in the upper and the other in the lower portion of each vane.
  • the straps are connected to alternate vanes and tend to cause the resonators between the vanes to oscillate in that mode in which thel-ultrahighfrequency potential, at the inner end of each vane is 180 i out of phase with that at an adjacent vane.
  • Each Vane I 0 has a slot I4 at the midpoint of the vane-along the axis of the resonator and extending radially from the cathode.
  • a wave path is shown in the form of a wave guide I5 coupled between a pair of adjacent cavity resonators I6 and I'I by means of resonator to wave guide matching sections I8 and I9.
  • the wave guide is provided with telescoping portions v20 so that ,it may be adjusted to the desired length.
  • it is coupled 'between the upper portion of resonator I6 and the lower portion Vof resonator I1.
  • is provided about cathode 9 in the plane of slots I4 to protect it against back bombardment in this area.
  • FIG. 5 there is shown three vanes 22, 23 and 24 of a magnetron formed by a plurality of vanes arranged radially about a cathode. The vanes form a pair of adjacent cavity resonators 25 and 26 with end wall 21. Each vane is provided with three slots 28, 29 and 30 extending a quarter of a wave length into the vane from the inner edge which will be adjacent the cathode.
  • Coupling path 32 is arranged between the portion of a resonator 25 which is between slots 29 and 30l and the lower portion of resonator 2B. 'Ihe coupled portions of the resonators will be oscillating in phase as discussed in connection with Figure 1 and if the paths 3 ⁇ I and 32 are coupled to the resonators ⁇ without phase reversal they should be made an even multiple of a half wave length long at the operating frequency in order that they will lock the coupled portions of the resonators into in-phase operations as is desired.
  • a magnetron for stable operation at ultrahigh frequencies with high power output comprising a cathode, an anode structure about said cathode having walls defining a plurality of cavity resonators, each of said walls being provided with a resonant slot extending radially from said cathode, and an electromagnetic wave path device coupled from a region in one of said resonators spaced axially from one of said slots in one direction to a region in another of said resonators spaced ⁇ axially from said one slot in the opposite direction.
  • a magnetron for stable operation of ultrahigh frequencies with high power output comprising a cathode and an anode structure a'bout said cathode having Walls defining a plurality of cavity resonators, each of said walls being provided with a slot substantially at the midpoint and extending lengthwiseradially from the edge of said wall adjacent said cathode, said slot being substantially a quarter Wave length long at the frequency of vibrations in the longitudinal mode in said cavity resonators.
  • a magnetron for stable operation at ultrahigh frequencies with high power output comprising a cathode, an anode structure about said cathode having vanes dening a plurality of cavity resonators, each of said vanes being provided substantially at its midpoint with a slot extending radially from said cathode, said slot being substantially a quarter wave length long at the frequency of vibrations in the longitudinal mode in said cavity resonators, and an electromagnetic wave path device coupled from a region in one oi said resonators spaced axially from one of said slots in one direction to a region in another of said resonators spaced axially from .said one slot in the opposite direction, said path device having a length to lock said coupled regions into in-phase oscillations.
  • a magnetron for stable operation at ultrahigh frequencies with high power output comprising an elongated cathode, an anode structure about said cathode having vanes defining a plurality of cavity resonators, each of said vanes being provided with a plurality of resonant slots evenly spaced axially along said vanes, and an electromagnetic wave path device coupled from a region in one of said resonators spaced axially from one of said slots to a region in another of said resonators spaced axially from said one slot in the opposite direction, andan additional electromagnetic wave path device coupled from a region in one of said resonators spaced axially from said one slot and from either of said rsttwo-mentioned regions to a region in another of said resonators spaced axially from said one slot and from any of said first-three-mentioned regions, said wave path devices each having a length to lock said coupled regions into in-phase oscillations.
  • a magnetron including a cathode and an anode about said cathode having wallsfdening a plurality of cavity resonators
  • means for stabilizing the operation of said magnetron at ultra-high frequencies with high power output comprising means in each of said walls dening a resonant slot extending radially from said cathode
  • rand means coupling a first region in one of said resonators spaced axially from one of said slots in one direction to a second region in another of said resonators separated from said one resonator by an even number of resonators, said second region being spaced axially from said one slot in the opposite direction from said first region, said means being designed to lock said regions into inphase oscillations.

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US160749A 1950-05-08 1950-05-08 High-frequency magnetron Expired - Lifetime US2642551A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL77788D NL77788C (fr) 1950-05-08
NL7403300.A NL161075C (nl) 1950-05-08 Werkwijze voor het schroeflijnvormig opwikkelen van een onder een hoek gebogen band op ovale buizen, alsmede een inrichting voor het uitvoeren van de werkwijze.
US160749A US2642551A (en) 1950-05-08 1950-05-08 High-frequency magnetron
GB5111/51A GB686499A (en) 1950-05-08 1951-03-02 High frequency magnetron
DEI4103A DE893062C (de) 1950-05-08 1951-04-29 Magnetron fuer grosse Leistung bei ultrahohen Frequenzen
FR1036851D FR1036851A (fr) 1950-05-08 1951-05-08 Magnétron à haute fréquence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US160749A US2642551A (en) 1950-05-08 1950-05-08 High-frequency magnetron

Publications (1)

Publication Number Publication Date
US2642551A true US2642551A (en) 1953-06-16

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US160749A Expired - Lifetime US2642551A (en) 1950-05-08 1950-05-08 High-frequency magnetron

Country Status (5)

Country Link
US (1) US2642551A (fr)
DE (1) DE893062C (fr)
FR (1) FR1036851A (fr)
GB (1) GB686499A (fr)
NL (2) NL77788C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828441A (en) * 1954-12-24 1958-03-25 Hans K Jenny Apertured vane magnetron
US2831148A (en) * 1952-08-19 1958-04-15 M O Valve Co Ltd Resonant cavity magnetrons

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2759122A (en) * 1954-10-01 1956-08-14 Rca Corp Tunable magnetron
US2906921A (en) * 1956-08-23 1959-09-29 Gen Electric Magnetron
JPH06105594B2 (ja) * 1987-12-22 1994-12-21 新日本無線株式会社 マグネトロン
GB2238903B (en) * 1989-12-08 1994-10-19 Eev Ltd Magnetrons

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446825A (en) * 1942-12-31 1948-08-10 Gen Electric Ultra high frequency electric discharge device
US2446826A (en) * 1943-04-14 1948-08-10 Gen Electric Magnetron
US2454560A (en) * 1942-10-02 1948-11-23 Gen Electric Ultra high frequency electric discharge device
US2497831A (en) * 1945-08-22 1950-02-14 Rca Corp Electron discharge device employing cavity resonators
US2523286A (en) * 1945-05-12 1950-09-26 Gen Electric High-frequency electrical apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454560A (en) * 1942-10-02 1948-11-23 Gen Electric Ultra high frequency electric discharge device
US2446825A (en) * 1942-12-31 1948-08-10 Gen Electric Ultra high frequency electric discharge device
US2446826A (en) * 1943-04-14 1948-08-10 Gen Electric Magnetron
US2523286A (en) * 1945-05-12 1950-09-26 Gen Electric High-frequency electrical apparatus
US2497831A (en) * 1945-08-22 1950-02-14 Rca Corp Electron discharge device employing cavity resonators

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831148A (en) * 1952-08-19 1958-04-15 M O Valve Co Ltd Resonant cavity magnetrons
US2828441A (en) * 1954-12-24 1958-03-25 Hans K Jenny Apertured vane magnetron

Also Published As

Publication number Publication date
NL77788C (fr)
FR1036851A (fr) 1953-09-11
NL161075C (nl)
GB686499A (en) 1953-01-28
DE893062C (de) 1953-10-12

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