US2497831A - Electron discharge device employing cavity resonators - Google Patents

Electron discharge device employing cavity resonators Download PDF

Info

Publication number
US2497831A
US2497831A US611937A US61193745A US2497831A US 2497831 A US2497831 A US 2497831A US 611937 A US611937 A US 611937A US 61193745 A US61193745 A US 61193745A US 2497831 A US2497831 A US 2497831A
Authority
US
United States
Prior art keywords
resonators
adjacent
chamber
anode
cavity resonators
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
US611937A
Other languages
English (en)
Inventor
Vore Henry B De
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 NL69080D priority Critical patent/NL69080C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US611937A priority patent/US2497831A/en
Priority to FR932091D priority patent/FR932091A/fr
Priority to CH271760D priority patent/CH271760A/de
Priority to GB24972/46A priority patent/GB617937A/en
Application granted granted Critical
Publication of US2497831A publication Critical patent/US2497831A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • 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

  • My invention relates to electron discharge devices useful. at ultra high frequencies and more particularly to such devices utilizing cavity resonators, for example, cavity resonator type magnetrons.
  • the anode segments or elements define a cylindrical chamber in which is coaxially mounted a cathode or into which chamber electrons are axially directed. Adjacent anode segments are coupled together by means of cavity resonators.
  • a cylindrical anode block has at its axis a cylindrical chamber extending therethrough. Radial slots which are closed at their outer ends and open at their sides communicate at their inner ends with this chamber and provide the cavity resonators, the walls of the-cathode chamber between the slots providing the anode segments.
  • the cathode is mounted coaxial of this chamber.
  • radially directed vanes may be mounted within a drum-shaped enclosure, the inner ends forming the anode elements and the spaces between the vanes forming the resonators.
  • the cavity resonators may be formed simply by sheet metal structures coupling adjacent edges of the anode elements or segments surrounding the cathode space and defining the cathode chamher.
  • the usual magnetic means are provided for directing a magnetic field parallel to the cathode or parallel to the cathode chamber into which the electrons may be directed.
  • Figure 3 is a transverse section taken along the line 3-3 of Figure 4 and showing a modification of the construction of Figures 1 and 2
  • Figure 4 is a transverse section taken along the line 4-4 of Figure 3
  • Figure 5 is a perspective of a further modification of the construction shown in Figures 1 and 2
  • Figure 6 is a perspective showing a modification of the construction shown in Figures 8 and 4 of an electron discharge device made according to my invention.
  • the anode block of conducting material designated generally at H" comprises two registering sections 26 and 21 at the longitudinal axis of which is provided the cathode chamber l i from which extend the radially directed slots I2. These slots I 2 form the cavity resonators, the portions l2 of the chamber wall between slots I3 providing the anode seg ments or elements defining the cathode chamber l I.
  • the ends of the anode block are provided with the recessed chambers Hi and I5 and the step portions 20 and 2
  • the indirectly heated cathode l0 coated with the usual emitting material is insulatingly supported within the cathode chamber H by means of insulating discs 16 and ii, the cathode and its associated heating element being provided with insulated leads l8 and i9 extending to the exterior of the envelope.
  • the usual magnetic poles 24 and 25 provide a constant magnetic field parallel to the cathode and between the cathode and anode block.
  • the sections 26 and 21 are provided with annular depressions or channels of semi-circular cross section which register to provide the tubular duct or passageway 28 between the cavity resonators.
  • a conductor 29 mounted centrally of this duct 28 is a conductor 29 in the form of a closed ring and insulatingly supported within the duct by means of insulating beads Jill-30.
  • this concentric transmission line is such that the propagation time for a wave passing along the line from one cavity to the next is an odd number of half periods of oscillations generated.
  • the speed of propagation of a wave is equal to the velocity of'light, and the length of the concentric transmission lines between adjacent cavities should be 3 an odd number of half wave-lengths.
  • This line then should be located at such a distance from the center of the anode that its length is where is the wavelength of the oscillations, N is the number of cavities and nisanyinteger.
  • the anode block comprises the two annular sections 30 and 3
  • the portionsx31 between the slot resonators 36 provide the anode segments.
  • the cavity resonators are shaped as rectangular cavities completely enclosed except forthe opening into the cathode space 38. Each cavity would thus be in the form of a hollow rectangular box with the endifacing the cathode open.
  • These boxes are so proportioned as to resonate with the oscillating electric field directioncircumferential with respect to the anode cylinder or block.
  • the axial dimension of the box is less than one wavelength and more than one-half wavelength of the radia tion to be generated.
  • the dimension in the direction of the electric field may be any convenient value, preferably smaller than a half wavelength.
  • the radial dimension may be any value, preferably greater than a half wavelength. The possibility of making this radial dimension large adds to the convenience of manufacture in the case of the device designated to produce oscillations of the order .of ten thousand megacyclesand greater.
  • the indirectly heated cathode 39 is provided with'heater 40, and theleads 4
  • the wave transmission meansfor coupling the adjacent resonators is a tubular waveguide having dimensions a and b, the waveguide being formed by anannular depressions'or grooves in the 'facing surfacesof the two portions 30 and 3! of the anode block which when assembled providea peripherally closed tubular passageway 43.
  • the magnets and 46 provide the usual magnetic field parallel to the cathode and filling the cathode-anode space.
  • the speed of propagation is not equal to the'speed of light and must be calculated for-the mode'of'propagationin? the guide, thecross' sectional dimension of the-guide and the'freouencv-Ofoscillation. From the calculated speed of propagation the proper length of the waveguide may be chosen to give the propagation time of 1a wave .from :one cavity wall'to thenext equal to an integral number of periods.
  • the method whereby a waveguide couples to a resonant cavity is somewhat different from that for a coaxial line. In either case, the object is to have the oscillations in adjacent cavities in opposite phase.
  • connecting waveguide must have thesame direction-at ever instant, and hence the proper length of the waveguides must be an integral number of wavelengths, measured in the guides.
  • the rectangular waveguides should be dimensioned-such that'the radical dimension 0. is less than one-half of theCfree space wavelength while the dimension b-parallel to'the axis of the-anode is-greater than one half and preferably lessthan one free space wavelength.
  • the guide wavelength' will'then be determined by thisaxial dimension.
  • Theguide wavelength'A isgiven .by:
  • the coupling is to the electromagnetic field between the cavity walls. Sincethis is exactly Opposite in phase in adjacent cavities, the connecting concentric transmissionline should be an odd number of half wavelengths in. length, measured to the cavity centers.
  • Figures 5. and 611 show a still further modification of the invention.
  • Figure 5 is of the form shown in Figures 1 and'2,except that eachof the cavity resonators l2 is;formed by sheet metal which is connectedzto the:a'djacent ed es'of two adjacent anode segments or elements 13. .
  • conventional coaxial lines '28,,29" couple adjacent cavity resonators.
  • energy' may be coupled out of the device 'in-the usual ways,'such as for example by coupling loopsextending intoa coaxial transmission line, or through windows into wave uides.
  • An electron discharge device having a plurality of anode elements defining a chamber, a cathode for supplying electrons within said cham ber, cavity resonators coupled between adjacent anode elements and wave transmission means coupling said resonators together, said coupling means including a peripherally-closed tubular conducting wall extending between and opening into adjacent resonators intermediate the ends thereof.
  • An electron discharge device having a plu rality of anode elements defining a chamber, a
  • cathode for supplying electrons within said chamber, cavit resonators coupled between adjacent anode elements and wave transmission means coupling said resonators together, said coupling means including a peripherally-closed tubular conducting wall extending between and opening into adjacent resonators intermediate the ends thereof, said tubular conducting wall having an axial length substantially equal to an odd number of half wavelengths of the fundamental frequency of said resonators.
  • An electron discharge device having an anode block of solid conducting material, said ber and forming therebetween anode elements defining said chamber and cavity resonators connecting adjacent anode elements, said block having a tubular passageway connecting adjacent cavity resonators intermediate the inner and outer ends thereof and a conductor positioned axially of said tubular passageway and insulated from the walls thereof and providing with said tubular passageway a concentric transmission line connecting adjacent resonators.
  • An electron discharge device having an anode block of solid conducting material and having an axially directed central chamber, and cathode means for supplying electrons within said chamber, said anode block having radially di rected slots extending from said chamber and forming anode elements between the inner ends of adjacent slots, said slots providing cavity resonators connecting adjacent anode elements, said block having resonator coupling means comprising a peripherally-closed tubular passageway connecting adjacent cavity resonators intermediate the inner and outer ends thereof.
  • An electron discharge device having an anode block of solid conducting material, said block having an axially directed central chamber, cathode means for supplying electrons within said chamber, said anode block having radially directed slots extending from said chamber and forming anode elements between the inner ends of the slots, said slots providing cavity resonators connecting adjacent anode elements, said block having an annular tubular passageway connecting adjacent cavity resonators intermediate the inner and outer ends thereof, and a ring-like conductor positioned centrally of said passageway and insulated from the walls thereof and lengths of the resonant frequency of said reso.-'.
  • each of said parts having an axially directed central chamber and a plurality of radially directed slots extending from said chamber and forming anode elements between the inner ends of the slots, said slots providing cavity resonators connecting adjacent anode elements, each of said parts having an annular channel in the contacting face thereof, said channels registering for providing an annular tubular passageway, said annular tubular passageway coupling adjacent resonators together.
  • An electron discharge device having an anode block comprising two registering parts, each of said parts having an axially directed central chamber and a plurality of radially directed slots extending from said chamber and forminganode elements between the inner ends of the slots, said slots providing cavity resonators con-- necting adjacent anode elements, each of said parts having an annular semi-cylindrical channel in the contacting face thereof, said channels registering for providing an annular tubular passageway, said annular tubular passageway coupling adjacent resonators together, and a ring-like conductor positioned within said annular tubular passageway but insulated from the to adjacent edges of adjacent arcuate shaped elements to provide cavity resonators connected between adjacent anode elements, cathode means for supplying electrons within said central chamber, and tubular conducting members extending between adjacent resonators for coupling adja cent resonators intermediate the ends thereof.
  • An electron discharge device having a plurality of arcuate shaped elongated conducting anode elements lying in the surface of a cylinder and defining a central chamber and spaced along.
  • An electron discharge device having a plu-' rality or arcuate shaped elongated conducting anode elements lying in the surface of a cylinder and defining a central chamber and spaced along their longitudinal edges to provide gaps, a plurality of elongated sheet-like U-shaped members having their legs connected to adjacent edges of adjacent arcuate shaped.
  • An electron discharge device having a plurality of arcuate shaped elongated conducting anode elements lying in the. surface of a cylinder and defining a central chamber and spaced along their longitudinal edges to provide gaps.
  • a pluralityof elongated sheet-like U-shaped members having theirlegs connected to adjacent edges of adjacent arcuate shaped elements to provide cavity resonators connected between adjacent anode elements, cathode means for supplying electrons within said central chamber, tubular conducting members extending between adjacent resonators, and a conductor within said tubular members and insulated therefrom for providing a trans mission line coupling adjacent resonators, said tubular members being arcuate shaped and having such a radius of curvature that the length of said tubular members is substantially equal to an odd number of half wavelengths of the resonant frequency of the cavity resonators.
  • An electron discharge device having a plurality-of spaced anode elements defining a chamber, a cathode for supplying electrons within said chamber, cavity resonators coupled between adjacent anode elements and opening into said-cham ber, 'said resonators being substantially closed except for the opening into said chamber, and wave transmission means for coupling said resonators together, said coupling means including a tubular conducting wall extending between and opening into adjacent resonators intermediate the ends thereof.
  • An electron discharge device having a plurality of spaced anode elements defining a chamber, a cathode for supplying electrons within said chamber, cavity resonators coupled between adjacent anode elements and opening into said chamber, said cavity resonators being substantially closed except for the opening into said chamber, and wave transmission means coupling adjacent resonators together, said coupling means including a tubular wave guide extending between and opening into adjacent resonators intermediate the ends thereof, the length of said wave guide being substantially equal to an integral number of wavelengths in the wave guide of the fundamental frequency of said resonators.
  • An electron discharge device having an anode block of solid conducting material, said block having anaxially directed central chamber, and cathode means for supplying electrons within' saidchamber, said anode block having radially directed slots extending from said chamber and forming therebetween anode elements defining said chamber and cavity resonators connecting adjacent anode elements, said cavity resonators being substantially closed on all sides and at the outer end and open to the central chamber, said block having a tubular passageway connecting adjacent cavity resonators intermediate the inner and outer ends thereof.
  • An electron discharge device having an anode block of solid conducting material, said block having an axially directed central chamber, and cathode means for supplying electrons within said chamber, said anode block having radially directed slots extending from said chamber and forming therebetween anode elements defining said chamber and cavity resonators'connectlng' adjacent anode elements, said block having reso nator coupling means comprising a tubular passageway connecting adjacent cavity resonators intermediate the inner and outer ends thereof, the axial length of each of said cavity resonators slots being less than one wavelength of the generated frequency but greater than one-half wavelength, and the radial dimension thereof being greater than one-half wavelength.
  • An electron discharge device having a plurality of anode elements defining a chambena cathode for supplying electrons Within said chamber, cavity resonators coupled between adjacent anode elements, and wave transmission means coupling said resonators together and including a peripherally-closed tubular Wave guide section extending between and opening into each pair of adjacent resonators intermediate the ends thereof.
  • An electron discharge device of the magnetron type comprising an annular series of spaced parallel elongated anode elements defining a cylindrical cathode space, an elongated cathodecoaxially mounted in said space, a radially directed rectangular cavity resonator connected between each pair of adjacent anode elements, means for establishing a constant magnetic field axially of said cathode space, and wave transmission means coupling said resonators together and including an arcuate peripherallyclosed tubular conducting wall concentric with said cathode space and extending between and opening into each pair of adjacent resonators intermediate the inner and outer ends thereof, whereby the desired mode of operation of said device is favored.
  • An electron discharge device wherein the length of the wave guide section between adjacent resonators is substantially equal to an integral number of wavelengths in the guide of the fundamental frequency of said resonators.
  • An electron discharge device having a plurality of anode elements defining a chamber, a cathode for supplying electrons within said chamber, cavity resonators coupled between adjacent anode elements, and wave transmission means coupling said resonators together and including a tubular wave guide section connecting adjacent resonators together and having a length between resonators substantially equal to an integral number of wavelengths in the wave guide of the fundamental frequency of said resonators.

Landscapes

  • Microwave Tubes (AREA)
US611937A 1945-08-22 1945-08-22 Electron discharge device employing cavity resonators Expired - Lifetime US2497831A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL69080D NL69080C (en(2012)) 1945-08-22
US611937A US2497831A (en) 1945-08-22 1945-08-22 Electron discharge device employing cavity resonators
FR932091D FR932091A (fr) 1945-08-22 1946-08-09 Dispositif à décharge électronique
CH271760D CH271760A (de) 1945-08-22 1946-08-10 Magnetron.
GB24972/46A GB617937A (en) 1945-08-22 1946-08-21 Improvements in or relating to electron discharge devices for use on ultra high frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US611937A US2497831A (en) 1945-08-22 1945-08-22 Electron discharge device employing cavity resonators

Publications (1)

Publication Number Publication Date
US2497831A true US2497831A (en) 1950-02-14

Family

ID=24451007

Family Applications (1)

Application Number Title Priority Date Filing Date
US611937A Expired - Lifetime US2497831A (en) 1945-08-22 1945-08-22 Electron discharge device employing cavity resonators

Country Status (5)

Country Link
US (1) US2497831A (en(2012))
CH (1) CH271760A (en(2012))
FR (1) FR932091A (en(2012))
GB (1) GB617937A (en(2012))
NL (1) NL69080C (en(2012))

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2612623A (en) * 1949-10-26 1952-09-30 Raytheon Mfg Co Anode structure for electron discharge devices
US2642551A (en) * 1950-05-08 1953-06-16 Charles V Litton High-frequency magnetron
US2649556A (en) * 1950-05-13 1953-08-18 Charles V Litton Magnetron strapping arrangement
US2710364A (en) * 1949-01-17 1955-06-07 Cie Generale De Telegraphic Sa Cavity resonator magnetron
US2745040A (en) * 1953-10-12 1956-05-08 British Thomson Houston Co Ltd Cavity type magnetrons
US2748314A (en) * 1954-07-15 1956-05-29 Westinghouse Electric Corp Tuned magnetron
US2755415A (en) * 1956-07-17 Malter
US2778975A (en) * 1952-11-18 1957-01-22 British Thomson Houston Co Ltd Magnetrons
US2899603A (en) * 1955-07-06 1959-08-11 Tunable magnetron
US2950416A (en) * 1957-02-15 1960-08-23 William C Brown Magnetron output control

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5335432B2 (en(2012)) * 1971-11-22 1978-09-27
JPS4984574A (en(2012)) * 1972-12-20 1974-08-14
GB8717440D0 (en) * 1987-07-23 1987-10-21 English Electric Valve Co Ltd Magnetrons
EP0300608A3 (en) * 1987-07-23 1990-07-18 English Electric Valve Company Limited Magnetrons

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH215600A (de) * 1938-08-12 1941-06-30 Bbc Brown Boveri & Cie Anordnung mit einer Magnetronröhre.
US2284405A (en) * 1940-08-17 1942-05-26 Gen Electric High frequency apparatus
US2348986A (en) * 1940-10-24 1944-05-16 Rca Corp Resonant cavity magnetron
US2406370A (en) * 1938-07-08 1946-08-27 Univ Leland Stanford Junior Electronic oscillator-detector
US2408409A (en) * 1941-04-08 1946-10-01 Bell Telephone Labor Inc Ultra high frequency electronic device
US2415253A (en) * 1940-10-24 1947-02-04 Rca Corp Cavity resonator magnetron
US2418469A (en) * 1944-05-04 1947-04-08 Bell Telephone Labor Inc Tuner for multiresonators
US2450023A (en) * 1943-11-15 1948-09-28 Raytheon Mfg Co Electron discharge device of the magnetron type

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406370A (en) * 1938-07-08 1946-08-27 Univ Leland Stanford Junior Electronic oscillator-detector
CH215600A (de) * 1938-08-12 1941-06-30 Bbc Brown Boveri & Cie Anordnung mit einer Magnetronröhre.
US2284405A (en) * 1940-08-17 1942-05-26 Gen Electric High frequency apparatus
US2348986A (en) * 1940-10-24 1944-05-16 Rca Corp Resonant cavity magnetron
US2415253A (en) * 1940-10-24 1947-02-04 Rca Corp Cavity resonator magnetron
US2408409A (en) * 1941-04-08 1946-10-01 Bell Telephone Labor Inc Ultra high frequency electronic device
US2450023A (en) * 1943-11-15 1948-09-28 Raytheon Mfg Co Electron discharge device of the magnetron type
US2418469A (en) * 1944-05-04 1947-04-08 Bell Telephone Labor Inc Tuner for multiresonators

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755415A (en) * 1956-07-17 Malter
US2710364A (en) * 1949-01-17 1955-06-07 Cie Generale De Telegraphic Sa Cavity resonator magnetron
US2612623A (en) * 1949-10-26 1952-09-30 Raytheon Mfg Co Anode structure for electron discharge devices
US2642551A (en) * 1950-05-08 1953-06-16 Charles V Litton High-frequency magnetron
US2649556A (en) * 1950-05-13 1953-08-18 Charles V Litton Magnetron strapping arrangement
US2778975A (en) * 1952-11-18 1957-01-22 British Thomson Houston Co Ltd Magnetrons
US2745040A (en) * 1953-10-12 1956-05-08 British Thomson Houston Co Ltd Cavity type magnetrons
US2748314A (en) * 1954-07-15 1956-05-29 Westinghouse Electric Corp Tuned magnetron
US2899603A (en) * 1955-07-06 1959-08-11 Tunable magnetron
US2950416A (en) * 1957-02-15 1960-08-23 William C Brown Magnetron output control

Also Published As

Publication number Publication date
FR932091A (fr) 1948-03-11
GB617937A (en) 1949-02-14
CH271760A (de) 1950-11-15
NL69080C (en(2012))

Similar Documents

Publication Publication Date Title
US2497831A (en) Electron discharge device employing cavity resonators
US2611110A (en) Electronic discharge device of the cavity resonator type
US2432466A (en) Interdigital magnetron
US2489131A (en) Electron discharge device of the cavity resonator type
US2306860A (en) Electron discharge device for very high frequencies
US2548808A (en) Continuous-strip anode for magnetrons
US2815469A (en) Magnetron oscillators
US2629068A (en) Tunable magnetron device
US2462510A (en) Electron discharge device and associated circuit
US4013917A (en) Coupled cavity type slow-wave structure for use in travelling-wave tube
US3334266A (en) Coaxial output line for a magnetron
US2585084A (en) Electron discharge device of the magnetron type
US2655616A (en) Magnetron
US2901666A (en) Magnetron oscillators
US2720628A (en) Tunable cavity resonator
US3379926A (en) Coaxial magnetron having slot mode suppressing lossy material in anode resonators
US2658165A (en) Magnetron tube with cavity resonator
US2714178A (en) Tunable magnetrons
US2467538A (en) Electron discharge device
US2547503A (en) Multiresonator magnetron
US2759122A (en) Tunable magnetron
US3064158A (en) Magnetron cavity resonator assembly
US3093804A (en) Tunable cavity resonator
US2423161A (en) Electron discharge device of the plural cavity resonator type
US4100458A (en) Multipactor discharge tuned co-axial magnetrons