US2849652A - Magnetron - Google Patents

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US2849652A
US2849652A US425584A US42558454A US2849652A US 2849652 A US2849652 A US 2849652A US 425584 A US425584 A US 425584A US 42558454 A US42558454 A US 42558454A US 2849652 A US2849652 A US 2849652A
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vanes
cavity
cavity resonator
cathode
magnetron
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Steimel Karl
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Telefunken AG
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Telefunken AG
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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
    • 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

  • the present invention relates to. a new and improved short wave, cavity resonator type magnetron.
  • magnetrons which have four anode segments and in which the individual segments form a bridge circuit having two mutually decoupled resonant circuits. These magnetrons operate at relatively long wavelengths.
  • One of these well known arrangements may be illustrated by a circuit similar to the one shown in Fig. 2.
  • the inductive portions ofthe tuned circuits are shown as inductive elementsand the circuit capacitances shown as the distributed capacitances between adjacent anode sections. They also may be actual elements of an external tuned circuit.
  • the magnetron may be employed as a separately excited amplifier or may be operated as a frequency stabilized wave generator.
  • the range of this prior art magnetron is limited. It is not, for example,suitable for use at ultrashort wave lengths;
  • a magnetron comprising a cathode and aplurality of cavity resonators symmetrically disposed about the cathode, each having an open end. facing the cathode.
  • the number of cavity resonators is equal to an integral-multiple of x, x being an integer greater than one.
  • Means are provided coupled to at least some of the cavity resonators for causing immediately succeeding groups, each consisting. of x adjacent resonators, to oscillate together as succeedingfirst units, forming together a first cavity resonator system.
  • the above means aso causes immediately succeeding different groups, each consisting of x adjacent different ones of said resonators than comprise any first unit to oscillate together as immediately succeeding second units forming together a second cavity resonator system.
  • the first and second units overlap one another and are mutually electrically decoupled from one another.
  • the magnetron comprises a vane-type magnetron and the vanes of like phase in atleast one of the systems of cavity resonators are strapped together.
  • a first set of alternate vanes of the magnetron are maintained at a first predetermined direct potential and the remaining alternate vanes of the magnetron are maintained at a second predetermined direct. potential which is diiferent from the first predetermined direct potential.
  • the outer ends of a first set of alternate magnetron vanes are displaced in axial direction, that is toward one end of the cylindrical anode block and the outer. ends of another set of alternate vanes of the magnetron are dis 2 placed toward the other end of the cylindrical anode block.
  • Magnetrons constructed'in accordance with the invention can, as in the case of prior art magnetrons, either function as a separately excited amplifier or as a magnetron generator, the frequency of which is pulled into synchronization.
  • the proposed construction is of special importance when contrasted with the known arrangements.
  • Up to the present time in order to stabilize the frequency of a magnetron with a high Q device, it was necessary to provide an extremely short coupling circuit between the stabilizing device and one of: the cavity resonators of the magnetron. Although this did provide frequency stabilization of the magnetron, there was the disadvantage that even minor frequency variations caused abrupt jumps in the frequency output of the magnetron.
  • Fig. Us a top view of a magnetron in accordance with the invention, with the end plate of the magnetron removed, showing schematically the high frequeney field distribution between different anode vane. sections;
  • Fig. 2 is an equivalent circuit of Fig. 1;
  • Fig. 3' is a top view, with an end plate removed, of a preferred embodiment of a magnetron in accordance with the: invention
  • Fig. 4 is a cross-section along line AA of Fig. l;
  • Fig. 5 is a top view, with an end plate removed, of anotherembodiment of a magnetron in accordance with the invention;
  • Fig. 6 is a cross-section along line BB of Fig. 5';
  • Fig. 7 is a cross-sectional view of another embodiment of a' magnetron in accordance with the invention.
  • Fig. 8 is a top view of a magnetron, with an end plate removed, showing the high frequency field distribution of an arrangement wherein each" oscillating unit comprises three adjacent cavity resonators;
  • Fig. 9 is a top view, with an end plate removed, of apractical embodimentcf a magnetron in accordance with the arrangement shown in Fig. 8; and' Fig. 10 is a crosssection along line (BC of Fig. 9.
  • a vane-type magnetron having a cylindrical anode 60 symmetrically disposed about a' cathode 9. Secured to the anode block and extending inwardly therefrom toward the cathode is a first plurality of alternate anode vanes 1-4 and a second plurality of alternate anode vanes -fi. Also provided is a symmetrical coupling loop 61 which passes through an aperture in anode vane 5 or a non-symmetrical coupling loop 62 which passes through an aperture in vane 3.
  • the first set of alternate anode vanes comprise a first system of cavity resonators, each of said cavity resonators consisting of the space defined by one of the vanes, for example, such as vane 1, the inner wall between that vane and the next adjacent vane such as inner wall portion 63, the walls of the adjacent vane such as walls 64 and 65 of vane 8, the inner wall portion of the anode block adjacent the last-named vane, such as wall portion 66, and the next adjacent vane such as vane 4.
  • one of the cavity resonator units of the first system of cavity resonator systems is shown as a series of parallel lines between vanes 1 and 4. Succeeding units would comprise the spaces between vanes 1 and 2, 2 and 3, and 3 and 4.
  • one of the cavity resonator units of the second system of cavity resonators is shown as the crossed lines extending between vanes 5 and 6. It is to be understood that as in the case of the first system, succeeding cavity resonator units exist between vanes 6 and 7, 7 and 8, and 8 and 9. It is easily seen from the above that the two systems of cavity resonators overlap one another.
  • cathode structure 9 is illustrated schematically, however, it is to be understood that any type of cathode structure known in the magnetron art may be employed.
  • the equivalent circuit illustrated in Fig. 2 illustrates how the two cavity resonator systems are decoupled from one another.
  • anode vanes of like phase are illustrated as a single segment; thus rather than showing eight anode segments the drawing shows only four segments.
  • the segments 1, 2 correspond to vanes 1-4 and the segments 5, 6' correspond to vanes 5-8.
  • the resonant circuit inductance of the first system of cavity resonators is represented by inductance L and the resonant circuit inductance of the second cavity resonator system is represented by inductance L
  • the distributed capacitance between vanes which comprises the resonant circuit capacitances is represented by capacitances C 5, C 2, C 6, and C 1. From the equivalent circuit it is seen that the magnetron may be thought of as a bridge circuit in which segment pairs 1', 2' are decoupled from segments pairs 5', 6.
  • the arrangement of Fig. 1 comprises two cavity resonator systems which are independent from one another and which both interact with the same electron stream. If during the operation of the magnetron, energy is taken from only one of the systems as, for example, in the case where only coupling loop 61 is used to supply an external load, the unloaded system has a frequency stabilizing effect on the loaded system because of the much higher Q of the unloaded system. In some embodiments of the invention actually constructed it has been found that the Q of the unloaded system, in general, is about ten times that of the loaded system.
  • an output coupling loop such as 61 (Fig. 1) may be employed.
  • This loop passes through an aperture in vane 5 and loads the first cavity resonator system, that is, the one in which cavity resonator units comprise the space between vanes 1-2, 2-3 etc.
  • coaxial cables couple loop 61 to the load.
  • lecher lines may be employed or, in the case of higher frequencies, wave guides may be employed.
  • an unbalanced loop such as 62 which is grounded at one end to the anode shell, in order to supply the output of the magnetron to a load.
  • a coaxial line may be used to transmit the energy to the load orlecher lines, or a Wave guide according to the operating frequency.
  • a single output means is necessary. If it is desired to load the first cavity resonator system (1-4) then a loop such as 61 is used and if it is desired to load the second cavity resonator system (5-8) then a loop such as 62 may be used. It is also possible to use both loops simultaneously in the case where it is desired to use one of the loops for an output load and the other of the loops as an input to the magnetron. In a preferred embodiment of the invention, for example, it may be desirable to supply a control oscillation through loop 62 to the second oscillating system for purposes of frequency stabilization and to derive the output of the magnetron from the first cavity resonator system by means of loop 61.
  • the magnetron that at least the unloaded system (the one which is driven from an external source) is not self-excited.
  • the voltage fed to the unloaded cavity resonator system is a stabilizing oscillation
  • the frequency of the oscillation is preferably the same as that of the output frequency of the magnetron.
  • the stabilizing oscillation may be derived from a klystron or another magnetron oscillator.
  • the electron stream interacts with the oscillating field of the unloaded cavity resonator system and becomes divided up into characteristic bunches, such as is familiar in velocity modulation devices, so that the electron stream appears to provide between the distributed capacitances of the loaded cavity resonator system a predetermined reactive component.
  • the resonant frequency of the loaded cavity resonator system adjusts itself so that all reactive components mutually cancel one another.
  • the electron stream also influences the resonant frequency of the resonators of the loaded system of cavity resonators.
  • Figs. 3 and 4 illustrate an embodiment of the invention discussed above. It comprises a magnetron having a cylindrical anode block 30, a first set of alternate vanes PSI-31c, and a second set of alternate vanes 32-320 Within the block is a cathode 39 which is supplied through leads 52 and 53. For simplicity of illustration these are not shown in Fig. 3.
  • the set of vanes 31-31c are conductively connected to the anode shell and the remaining vanes 32420 are insulated from the shell by means of insulators 48-51, respectively. Vanes 32-32c are maintained at a potential ditferent from that of vanes 31-310 by means of a source of potential 45 which supplies direct voltage to the former vanes through leads 47.
  • Capacitor 42, coil 43 and resistor 44 serve to filter out any high frequency energy and prevent the same from entering the direct voltage source.
  • Strap 40 connects together vanes of a given like phase and strap 41 connects together vanes of another like phase. Strap 40 is connected only to vanes 31 and 31b and strap 41 is connected only to vanes 31a and 310.
  • the output of the system may be obtained by the coaxial line arrangement 46 the center conductor of which is connected to the inner strap and the outer conductor of which is connected to the outer strap.
  • the end plates 54 and 55 of the magnetron are illustrated in Fig. 4.
  • the magnetron acts as two separate systems of cavity resona- 31 and 31a, 31a and 31b, 31b and 310, and 31c and 31,
  • the cavity resonator system defined by vanes 31-31c is the loaded system and the cavity resonators defined by the vanes 32-320 is the unloaded system.
  • the source of potential 45 is accordingly made adjustable.
  • Figs. 5 and 6 illustrate another embodiment of the invention.
  • the magnetron comprises a cathode 10, an anode cylinder 19 symmetrically disposed about the cathode and a plurality of vanes. 11-18 conductively connected to the anode cylinder and extending inwardly toward the cathode.
  • vanes 1114. define a first system of cavity resonators and vanes. 15-18 define. a second system of cavity resonators.
  • the ends of the vanes conductively secured to the anode. cylinder 19- are, displaced in axial direction of the cylinder from one another.
  • the set of vanes 11-14 are displaced toward the left end of the anode cylinder (Fig. 6) and the set of'vanes 15-18. are displaced toward the right end. of the anode cylinder (Fig. 6).
  • the inner. ends of the vanes are aligned with one another andlie in an imaginary narrow cylindrical surface.
  • tuning equipment which may, for ex-' ample, make. use of the skin eifect principle and which does not otherwise disturb the above set forth, desirable mode of operation.
  • Fig. 7 illustrates schematically one preferred type of tuning arrangement which may be employed.
  • the vanes 11, 13, are displaced in axial direction of the cylinder from the vanes 17, 18.
  • two rings 20-, 21' which are shown in section in Fig. 7, are employed. These rings may be moved toward or away from the respective cavity resonator systems by means of mechanical shafts S, S, respectively, which serve to move membranes 22, 23, respectively, in the magnetron housing, the rings 20, 21 being held on said membranes by studs 67, 68., respectively.
  • Tuning arrangements such as described above are essential if it is desired to have the magnetron operate over abroad frequency band. In the event that an especially high Q is desired for the unloaded system, this may be obtained by increasing the surface conductivity of the. cavity resonators forming the unloaded cavity resonator CLO system as, for example, by plating the walls of the cavity resonators with silver as at X.
  • Fig. 8 illustrates a multiple cavity vane type magnetron for the purposes of explanation which includes three'cavity resonator systems which are mutually decoupled from one another.
  • the vanes defining the resonators of different systems are cross hatched differently.
  • the first set of cavity resonators is defined by vanes 25' -25;,; the second set of cavity resonators is defined by vanes 26 -26 and the third set of cavity resonators is defined by the vanes 27 -27
  • the field distribution pattern of cavity resonator system 25 is illustrated in part by the dashed line and arrows.
  • Figs. 9 and 10 illustrate a practical. embodiment of the magnetron shown in Fig. 8.
  • the cathode is not shown in these figures.
  • vanes of like phase of one of the systems are connected together by magnetronstraps 28 and- 29-.
  • the outer strap connects together vanes 25 and 25 and the inner strap connects together vanes 25: and 25
  • magnetron system 25 would be loaded and the output of'the magnetron would be obtained by connecting a pair. of conductors to the two.
  • a three system' cavity resonator magnetron arrangement may also be produced by offsetting from one another the respective vanes of. the three systems similar to the embodiment illustrated in Figs. 5-7.
  • Another type of mutually decoupled three is another type of mutually decoupled three:
  • system cavity magnetron may be. constructed by maintaining the vanes defining eachcavity resonator system at dilferent direct potentials similar to the; embodiment illustrated. in Figs. 3 and. 4. Finally, it is to.-be under stood that any two or more of the above means for providing mutually decoupled cavity resonator magnetrons may be employed.
  • a magnetron comprising, in combination, a cathode; a plurality of cavity resonators symmetrically disposed about said cathode and each having an open end facing the same, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupled to at least some of said cavity resonators for causing immediately succeeding groups, each consisting of x adjacent resonators, to oscillate together as succeeding first units forming together a first cavity resonator system, and for causing immediately succeeding different groups, each consisting of x adjacent different ones of said cavity resonators than comprise any of said first units, to oscillate together as succeeding second units forming together a second cavity resonator system, whereby said first and second units overlap one another and are mutually electrically decoupled from one another; output means coupled to one of said first units for extracting radio frequency energy from said magnetron and thereby loading said first cavity resonator system; and input means coupled to one of said second units
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one, a first set of alternate ones of said vanes being conductively connected to said anode cylinder, and the remaining ones of said vanes being insulated from said anode cylinder; and means coupled to said remaining ones of said vanes for maintaining them at a direct potential which is dilferent from that of said first set of alternate ones of said vanes, whereby said first set of vanes define a first cavity resonator system and said second set of vanes define a second cavity resonator system,
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one, a first set of alternate ones of said vanes being conductively connected to said anode cylinder, and the remaining ones of said vanes being insulated from said anode cylinder; means coupled to said remaining ones of said vanes for maintaining them at a direct potential which is different from that of said first set of alternate ones of said vanes, whereby said first set of vanes define a first cavity resonator system and said second set of vanes define a second cavity resonator system, the units of each cavity
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one, a first set of alternate ones of said vanes being conductively connected to said anode cylinder, and the remaining ones of said vanes being insulated from said anode cylinder; means coupled to said remaining ones of said vanes for maintaining them at a direct potential which is different from that of said first'set of alternate ones of said vanes, whereby said first set of vanes define a first cavity resonator system and said second set of vanes define a second cavity resonator system, the units of each
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from' said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of two, each of said vanes being conductively connected to said anode cylinder, and the ends of a first set of alternate ones of said vanes connected to said anode cylinder being displaced in the axial direction of said anode cylinder from the ends connected to said anode cylinder of the remaining of said vanes, whereby said first set of alternate ones of said vanes define a first cavity resonator system and the remaining ones of said vanes define a second cavity resonator system.
  • a magnetron comprising in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavityresonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of two, each of said vanes being conductively connected to said anode cylinder, the ends of a first set of alternate ones of said vanes connected to said anode cylin- 9 der being displaced in the axial direction of said anode cylinder from the ends connected to said anode cylinder of the remaining of said vanes, and the inner ends of allof said vanes lying in an imaginary narrow cylindrical surface, whereby said first set of alternate ones of said vanesdefine a first cavity resonator system and the remaining ones of said vanes define
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the
  • number of cavity resonators being equal to an integral multiple of two, each of said vanes being conductively connected to said anode cylinder, the ends of a first set of alternate ones of said-vanes connected to said anode cylinder beingjdisplaced in the axial direction of said anode'cylinder'from the ends connected to said anode cylinder of the remaining of said vanes, and the inner ends of all of said vanes lying in an imaginary narrow cylindrical'surface, whereby said first set of alternate ones of said vanes define a first cavity resonator system and the remaining ones of said vanes define a second cavity resonator system; and means coupled to said first cavity resonator system for extracting radio frequency energy from said magnetron and thereby loading said first cavity resonator system, whereby said second cavity resonatorsystem' has a Q which is substantially larger than the Q of the first cavity resonator system andthe second cavity resonator system thereby has a frequency stabilization efiect on said first cavity resonator system.
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of two, each of said vanes being conductively connected to said anode cylinder, the ends of a first set of alternate'ones of said vanes connected to said anode cylinder being displaced in the axial direction of said anode cylinder from the ends connected to said anode cylinder of the remaining ofsaid vanes, whereby said first set of alternate ones of said vanes define a first cavity resonator system and the remaining ones of said vanes define a second cavity resonator system; and means coupled to each of said cavity reson
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anodecylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open endfacing said cathode, the number or" I cavity resonators being equal to an integral multiple of two, each of said vanes being conductively connected to said anode cylinder, the ends of a first set of alternate ones of said vanes connected to said anode cylinder being displaced in the axial direction of said anode cylinder from the ends connected to said anode cylinder of the remaining of said vanes, whereby said first set of alternate ones of said vanes define a first cavity resonator system and the remaining ones of said vanes define a second cavity resonator system; a pair of tuning rings located inside of said anode
  • A.magnetron comprising, in combination, a cathode; a plurality of cavity resonators symmetrically disposed about said cathode and each having an open end facing the same, the number of cavity resonators being equal to an integral multiple of x, at being an integer greater'than one; and means coupled to at least some of said cavity resonators for causing immediately succeeding groups, each consisting of 2: adjacent resonators, to oscillate together as succeeding first units forming together a first.
  • each of said first units being defined by a pair ofexterior Wall portions having ends close to said cathode, said means comprising a first strap connecting said ends of said wall portions of a given phase together and a second strap connecting the ends-of said wall portions having a phase opposite that of said given phase together.
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end'facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; and means coupled to at least some of said cavity resonators for causing immediately succeeding groups, each consisting of x adjacent resonators, to oscillate together as succeeding first units forming together a first cavity resonator system, and for causing immediately succeeding different groups, each consisting of x adjacent difierent ones of said cavity resonators than comprise any of said first units, to oscillate together as succeeding second units forming together a second cavity resonator system, whereby said
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupled to at least some of said cavity resonators for causing immediately succeeding groups, each consisting of x adjacent resonators, to oscillate together as succeeding first units forming together a first cavity resonator system, and for causing immediately succeeding different groups, each consisting of adjacent different ones of said cavity resonators than comprise any of said first units, to oscillate together as succeeding second units forming together a second cavity resonator system, whereby said first and second units overlap one another
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupled to at least some of said cavity resonators for causing immediately succeeding groups, each consisting of x adjacent resonators, to oscillate together as succeeding first units forming together a first cavity resonator system, and for causing immediately succeeding different groups, each consisting of x adjacent different ones of said cavity resonators than comprise any of said first units, to oscillate together as succeeding second units forming together a second cavity resonator system, whereby said first and second units overlap
  • a magnetron comprising, in combination, a cathode; a plurality of cavity resonators symmetrically disposed about said cathode and each having an open end facing the same,'the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupled to at least some of said cavity resonators for causing immediately succeeding groups, each consisting of x adjacent resonators, to oscillate together as succeeding first units forming together a first cavity resonator system, and for causing immediately succeeding different groups, each consisting of x adjacent different ones of said cavity resonators than comprise any of said first units, to oscillate together as succeeding second units forming together a second cavity resonator system, whereby said first and second units overlap one another and are mutually electrically decoupled from one another; output means coupled to one of said first units for extracting radio frequency energy from said magnetron and thereby leading said first cavity resonator system, whereby said second cavity resonator system has
  • a magnetron comprising, in combination, a cath- 12 ode; a plurality of cavity resonators symmetrically disposed about said cathode and each having an open end facing the same, the number of said cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupling together an integral number of groups of x consecutively adjacent cavity resonators out of said plurality thereof so as to form a first cavity resonator system composed of said groups; and means coupling together an equal number of other groups of x consecutively adjacent cavity resonators out of said plurality thereof so as to form at least one other cavity resonator system composed of said other groups, each of said groups of one of said systems having at least one of said cavity resonators in common with one of the groups of another system, said different cavity resonator systems being arranged in a cyclically overlapping consecutive relationship and being electrically decoupled from one another.
  • a magnetron comprising, in combination, a cathode; an anode cylinder symmetrically disposed about said cathode; a plurality of vanes symmetrically arranged about said cathode and extending inwardly from said anode cylinder toward said cathode, said vanes defining a plurality of cavity resonators, each of said cavity resonators having an open end facing said cathode, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupling together an integral number of groups of x consecutively adjacent cavity resonators out of said plurality thereof so as to form a first cavity resonator system composed of said groups; and means coupling together an equal number of other groups of x consecutively adjacent cavity resonators out of said plurality thereof.
  • each of said groups of one of said systems having at least one of said cavity resonators in common with one of the groups of another system, said different cavity resonator systems being arranged in a cyclically overlapping consecutive relationship and being electrically decoupled from one another.
  • a magnetron comprising, in combination, a cathode; a plurality of cavity resonators symmetrically disposed about said cathode and each having an open end facing the same, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupling together an integral number of groups of x consecutively adjacent cavity resonators out of said plurality thereof so as to form a first cavity resonator system composed of said groups; and means coupling together an equal number of other groups of x consecutively adjacent cavity resonators out of said plurality thereof so as to form at least one other cavity resonator system composed of said other groups, each of said groups of one of said systems having at least one of said cavity resonators in common with one of the groups of another system, said different cavity resonator systems being arranged in a cyclically overlapping consecutive relationship and being electrically decoupled from one another; and output means coupled to one of said first groups for extracting radio frequency energy from said magnetron and thereby
  • a magnetron comprising, in combination, a cathode; a plurality of cavity resonators symmetrically disposed about said cathode and having each an open end facing the same, the number of cavity resonators being equal to an integral multiple of x, x being an integer greater than one; means coupling together an integral number of groups of x consecutively adjacent cavity resonators out of said plurality thereof so as to form a first cavity resonator system composed of said groups;

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US (1) US2849652A (xx)
DE (1) DE1084384B (xx)
FR (1) FR1103583A (xx)
GB (1) GB782741A (xx)
NL (1) NL100378C (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411034A (en) * 1965-06-11 1968-11-12 Sfd Lab Inc Microwave amplifier tube having capacitive loading means for the slow wave circuit
US5084651A (en) * 1987-10-29 1992-01-28 Farney George K Microwave tube with directional coupling of an input locking signal
CN114664616A (zh) * 2022-03-23 2022-06-24 电子科技大学 一种基于全腔耦合结构锁频锁相的轴向级联相对论磁控管

Citations (5)

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Publication number Priority date Publication date Assignee Title
US2343487A (en) * 1940-04-24 1944-03-07 Gen Electric Electron discharge device
US2474898A (en) * 1944-04-05 1949-07-05 Bell Telephone Labor Inc Electromagnetic resonator of the magnetron type
US2485401A (en) * 1946-06-04 1949-10-18 Gen Electric Magnetron
US2635209A (en) * 1946-03-01 1953-04-14 Albert M Clogston Strapped magnetron
US2766403A (en) * 1952-06-14 1956-10-09 Raytheon Mfg Co High frequency electrical oscillators

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
AT145988B (de) * 1934-09-04 1936-05-25 Telefunken Gmbh Schaltung eines fremdgesteuerten Magnetrons.
FR805927A (fr) * 1935-05-18 1936-12-03 Telefunken Gmbh Montage de contrôle extérieur en particulier de modulation
FR851554A (fr) * 1938-03-16 1940-01-11 Telefunken Gmbh Perfectionnements aux modes de montage pour magnétrons

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343487A (en) * 1940-04-24 1944-03-07 Gen Electric Electron discharge device
US2474898A (en) * 1944-04-05 1949-07-05 Bell Telephone Labor Inc Electromagnetic resonator of the magnetron type
US2635209A (en) * 1946-03-01 1953-04-14 Albert M Clogston Strapped magnetron
US2485401A (en) * 1946-06-04 1949-10-18 Gen Electric Magnetron
US2766403A (en) * 1952-06-14 1956-10-09 Raytheon Mfg Co High frequency electrical oscillators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411034A (en) * 1965-06-11 1968-11-12 Sfd Lab Inc Microwave amplifier tube having capacitive loading means for the slow wave circuit
US5084651A (en) * 1987-10-29 1992-01-28 Farney George K Microwave tube with directional coupling of an input locking signal
CN114664616A (zh) * 2022-03-23 2022-06-24 电子科技大学 一种基于全腔耦合结构锁频锁相的轴向级联相对论磁控管
CN114664616B (zh) * 2022-03-23 2023-05-23 电子科技大学 一种基于全腔耦合结构锁频锁相的轴向级联相对论磁控管

Also Published As

Publication number Publication date
GB782741A (en) 1957-09-11
DE1084384B (de) 1960-06-30
FR1103583A (fr) 1955-11-04
NL100378C (xx)

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