US2934672A - Velocity modulation electron discharge device - Google Patents

Velocity modulation electron discharge device Download PDF

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Publication number
US2934672A
US2934672A US665337A US66533757A US2934672A US 2934672 A US2934672 A US 2934672A US 665337 A US665337 A US 665337A US 66533757 A US66533757 A US 66533757A US 2934672 A US2934672 A US 2934672A
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United States
Prior art keywords
resonator
coaxial
resonators
waveguide
electron beam
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Expired - Lifetime
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US665337A
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English (en)
Inventor
Pollack Louis
Goldman Hyman
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TDK Micronas GmbH
International Telephone and Telegraph Corp
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Deutsche ITT Industries GmbH
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Priority to NL233762D priority Critical patent/NL233762A/xx
Priority to BE568536D priority patent/BE568536A/xx
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to US665337A priority patent/US2934672A/en
Priority to GB38653/57A priority patent/GB826090A/en
Priority to FR767226A priority patent/FR73294E/fr
Priority to GB18149/58A priority patent/GB887195A/en
Priority to US766514A priority patent/US2960658A/en
Priority to CH355223D priority patent/CH355223A/fr
Priority to FR781447A priority patent/FR1217880A/fr
Priority to CH356830D priority patent/CH356830A/fr
Application granted granted Critical
Publication of US2934672A publication Critical patent/US2934672A/en
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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
    • H01J25/02—Tubes with electron stream modulated in velocity or density in a modulator zone and thereafter giving up energy in an inducing zone, the zones being associated with one or more resonators
    • H01J25/10—Klystrons, i.e. tubes having two or more resonators, without reflection of the electron stream, and in which the stream is modulated mainly by velocity in the zone of the input resonator
    • H01J25/12—Klystrons, i.e. tubes having two or more resonators, without reflection of the electron stream, and in which the stream is modulated mainly by velocity in the zone of the input resonator with pencil-like electron stream in the axis of the resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/02—Tubes with electron stream modulated in velocity or density in a modulator zone and thereafter giving up energy in an inducing zone, the zones being associated with one or more resonators
    • H01J25/22—Reflex klystrons, i.e. tubes having one or more resonators, with a single reflection of the electron stream, and in which the stream is modulated mainly by velocity in the modulator zone
    • H01J25/24—Reflex klystrons, i.e. tubes having one or more resonators, with a single reflection of the electron stream, and in which the stream is modulated mainly by velocity in the modulator zone in which the electron stream is in the axis of the resonator or resonators and is pencil-like before reflection

Definitions

  • velocity modulation electron discharge devices such as klystron amplifiers and the like, fiat over a much wider' band of frequencies than have heretofore been possible.
  • the amplitude versus frequency response amplifiers has been mainly determined by the input and low level intermediate cavity resonators. These resonators operating as they do with low levels of beam velocity modulation have correspondingly little beam loading and a resulting high Q.
  • the simple cavity resonators are synchronously tuned, the overall response in cascade is quite narrow, and in the UHF (ultra-high frequency) range the bandwidth is less than 0.05 percent of the operating frequency.
  • 7 is possible to utilize characteristics of multicavity resonator klystrons staggered tuning that is partially analogous to cascaded staggered single tuned negative grid voltage amplifiers. This alignment yields fractional bandwidths no greater than approximately 0.5 percent if power gains are to be kept at a usable level.
  • An object of this invention is to provide a cavity resonator arrangement to increase the bandwidth capabilities of klystron amplifiers.
  • Another object of this invention is to provide a cavity resonator arrangement forklystron amplifiers enabling the achievement of fractional bandwidths of at least 2.5 percent in the upper UHF region with power gains of approximately 35 db.
  • Still another object of this invention is to provide'a double cavity resonator arrangement to provide a relatively broadband klystron amplifier.
  • a further object of this invention is to provide a double cavity resonator arrangement to obtain relatively wideband operation of multicavity resonator klystron amplifiers by means of resistive loading of one resonator of said double cavity resonator.
  • a feature of this invention is the provision of a first cavity resonator having a gap therein coaxial of an electron beam path for passage of an electron beam therethrough in coupled relation with the first resonator and a second cavity resonator remote from the beam path and in coupled relation with the first resonator to provide in conjunction therewith a double tuned circuit coupled to the electron beam to increase the bandwidth of velocity modulation amplifiers, such as klystrons.
  • Another feature of this invention is the provision of a first cavity resonator having a gap therein coaxial of an electron beam path for passage of an electron beam therethrough in coupled relation with the first resonator,
  • Still another feature of this invention is the provision of a rectangular waveguide resonator having agap therebeam path for passageof elec in coupled relation with the 'a'double tuned circuit coupled to the electron beam and aresistive load capacitively coupled to the coaxial resonator to cooperate in carrying out the objects and other features of this invention.
  • a further feature of this invention is the provision of a rectangular waveguide resonator having a gap therein coaxial of an electron beam path for passage of an electron beam therethrough in coupled relation with the waveguide resonator, and a coaxial cavity resonator remote and in a coupled relation with the waveguide resonator to provide in conjunction therewith a double tuned circuit coupled to the electron beam and a resistive load capacitively coupled to the coaxial resonator.
  • The-elements of the double tuned circuit arrangement control of waveguide cavity Q and, hence bandwidth, by varying the coefiicient of coupling of an inductive loop extending from the coaxial resonatorinto the field of the waveguide resonator enclosing the klystron interaction gap.
  • the adjustablecoefficient of coupling may be accomplished by varying the angular position of the inductive loop withrespect to the magnetic field or the physical penetration of the inductive loop into the waveguide cavity.
  • transitional response or coupling is meant the maximum coupling between the ,two cavities which will give the broadest fiat top amplitude versus frequency response. This occurs just prior to obtaining the usual double peak response condition of critical coupling.
  • Another feature of this invention includes coupling the input RF energy into the coaxial resonator of the double tuned circuit and loading the circuit by a' resistive load coupled to the waveguide resonator through a low inductance loop.
  • Another feature of this invention includes coupling the output energy at the final klystron gap to a double tuned waveguide resonators mutually coupled by an iris in the common wall thereof thereby being useful as a high power output double tuned circuit.
  • Still a further feature of this invention is the provision of a multicavity resonator klystron wherein each of the cavity resonators contain one or more of the above featuresto achieve a relatively broadband klystron amplifier.
  • Fig. 1 is a diagrammatic representation of klystron amprinciples of this invention
  • Fig. 2 is an equivalent circuit diagram of the radio frequency circuit of the klystron of Fig. 1;,and
  • Fig. 3 is a cross-sectional view taken along line .3--:3
  • Tlie'klystron ampli- -fi'er may consist of a filament 1 heating acathode' 2 for emission of electrons and a focusing electrode 3 for formation of the electrons into a relatively narrow electron beam for propagation along an electron beam path to Appropriate heating potential for filament 1 is supplied from source 5 through the transformer-6. Potentials for the other electrodes are supplied in a conventional manner from sources 7 and 3, as illustrated.
  • drift tubes 9 spaced along the beam path and provided with The beam forming would normally be closed in a vacuum enclosure 4a and the electron beam would be focused along its beam path by means of a magnetic field focusing arrangement (not shown).
  • the velocity modulation action which takes placeat the interaction gaps 10 and the density modulation which takes place in the drift tubes 9 are frequency-sensitive mechanisms and, therefore, the 'usual klystron with conventional high Q tuned circuits is inherently arnarrow
  • bandwidths of from 2.5 percent of center frequency or greater can be achieved, depending on the number of cascaded cavities and power gain required.
  • these double tuned circuits associated with the first five gaps of the klystron amplifier takes the form of cavity resonators 11-1111 tuned tothe operating frequency of the device, such as a rectangular waveguide cavity resonator.
  • the klystron interaction gaps '10-10d may be considered to be a part of the resonators 11-114 arranged coaxially of the electron beam path in a manner whereby an interaction takes place between the electron beam and resonators 11-11d.
  • the propagation mode in cavity resonators 11-11d is the principalor dominant one and the resonators 11-11d are tuned to the operating frequency by moving the primary sliding shorts 12 as illustrated in Fig. 3. To carry out band device.
  • resonators 11-11d have added thereto coaxial resonators 13-13d mutually coupled to resonators 11-11d through inductive coupling loops 14'14a'.
  • the resonant frequency of resonators 13-13d is varied or tuned by moving the sliding plungers or short circuiting elements 15-15d and/or varying thesize or depth of penetration of loops 14-14d. Depth of penetration means the physical length of loops 14-1411 extending into resonators 11-11d. Adjustment of the mutual coupling between resonators 11111d and 13-13d is provided by rotating the coupling loops .by
  • the adjustments or controls, described above, can bemanipulated .while the coaxial resonators are coupled orconnected to the waveguide resonators mounted on the klystron and during 'all adjustments of the klystron at any power levelsof D.C.- beam: power and input radio frequency energy that may be applied to the klystron.
  • the resonators aifected gaps 10-10d consist of coaxial resonators 13-13:! and rectangular waveguide resonators
  • the waveguide resonators 11-11d surround the klystron gaps 10-10d for velocity modulation of the electron beam.
  • the output circuit 20 is formed by two waveguide resonators 21 and 22 mutually coupled together by a variable iris 23 located in the common wall between the resonators 21 and 22.
  • Resonators 2,1 and 22 may be tuned by shorting plungers substantially as shown in Fig. 3.
  • the RF energy is removed througha coaxial line 24 to a suitable load, suchas anantenna, by means of variable capacitive coupling 25.
  • each circuit is loaded with an external resistor to reduce the Q and broaden the amplitude vs. frequency response characteristic. This is illustrated schematically by resistors 18-180 which are connected across the inner and outer conductors and coupled to coaxial resonators 13a-13d, thru coupling 19-19c.
  • the waveguide resonatorll is loaded'by means of resistive load 27 mg of the resonant-circuit.
  • the input signal iscoupled line 30 and the variablecapacitive coupling means 31.
  • The-coupling and loading of input circuit 26- is adjusted to ob tain maximum power transfer and maximal response (equal Q in the nator 11 and secondary i
  • the intermediate circuits flatness of primary circuit waveguide resocircuit coaxial resonator 13). 17 are loaded on one side only through thecoaxial resonator to achieve the maximum impedance acrossthe klystron gap for the given band-width.
  • waveguide resonator 21 is loaded by the klystron beam impedance across the klystron gap for the given bandwidth.
  • waveguide resonator 21 is loaded by the klystron beam impedance andwaveguide resonator 22 is loaded by the output load or'antenna impedance coupled through-thecapacitive coupling 25.
  • the load resistors used inthe first three tuned circuits, resistors 27, 18 and 18a may be air-cooled and the load resistors of other intermediate lcircuits, resistors 18b and 180, may be coaxial linewater oads.
  • the six Idouble tuned circuits are synchronously aligned and cenadjusted for transitional coupling with the klystron unenerg1zed.
  • a sweep signal generator is coupled to one circuit at a time and a response observed at a test point incorporated in the circuit. Then under normal drive and power input conditions, a slight readjustment of the clrcuitwlll result in a desired response.
  • a broadband velocity modulation electron discharge device comprising means to project an electron beam along a given path; a double tuned circuit disposed in energy exchanging relationship with said electron beam including a first cavity resonator having a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with said first resonator, a second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, inductive coupling means for energy exchange between said first and second resonators and means included in each of said first and second resonators to tune each of said resonators independent of one another; and a resistor coupled to said first resonator, said resistor and said double tuned circuit cooperating to increase the effective bandwidth of said discharge device.
  • a broadband velocity modulation electron discharge device comprising means to, project an electron beam along a given path; a double tuned circuit disposed in energy exchanging relationship with said electron beam including a first cavity resonator having a gap therein coaxial of said beam path for passage of said electron beam, therethrough in energy exchanging relationship with said first resonator, a second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, inductive coupling means for energy exchange between said first and second resonators, and means includedin each of said first and second resonators to tune each of said resonators independent of one another; a means to couple radio frequency energy directly into. said second resonator independent of said first resonator; and a resistor coupled to said first resonator; said resistor and said double tuned circuit cooperating to increase the efiective bandwidth of said discharge device.
  • a broadband velocity modulation electron discharge device comprising means to project an electron beam along a given path; and a double tuned circuit to increase the elfective bandwidth of said discharge device disposed in energy exchanging relationshipwith said electron beam including a rectangular waveguide resonator having a gap therein coaxial of said beam path for passage of siad electron beamtherethrough.
  • a broadband velocity modulation electron discharge device comprising means to project an electron beam along a given path; and a double tuned circuit to increase the eftectivebandwidth of said discharge device disposed in energy exchanging relationship with said electron beam including a first cavity resonator having a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with said first resonator, asecond cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said' firstresonator, means included in each of said first and second resonators to tune .inductive'coupling loop for-energy exchange between along a given path;
  • first and second resonators and means to adjust the physical position of said coupling loop to adjust the coefficient of coupling between said first and second resonators; a resistor; and means to adjustably couple said resistor directly to said second resonator independently of said first resonator to cooperate with said double tuned circuit to increase the effective bandwidth of said discharge device.
  • a broadband velocity modulation electron discharge device comprising means to project an electron beam a double tuned circuit disposed in energy exchanging relationship with said electron beam including a. first cavity resonator having a gap therein coaxial of said beam path for passage of said electron beam therethr ough in energy exchanging relationship with said first resonator, a second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, means included in each of said first and second resonators to tune each of said resonators independent of one another, an inductive coupling loop for energy exchange between said first and second resonators, said coupling loop forming a component of said second resonator, and means to adjust the physical position of said coupling loop to adjust the coefficient of coupling between said first and secnd cavities; a resistor; and means to adjustably couple said resistor to said first resonator, said resistor and said double tuned circuit cooperating to increase the efiective bandwidth of said discharge device.
  • a broadbandvelocity modulation electron discharge device comprising means to project an electron beam along a given path; a double tuned circuit disposed in energy exchangingrelationship with said electron beam includinga firstcavity resonator having a gap therein coaxial of said beam path for passage of said electron beam there through in energy exchanging relationship with said first resonator, a second cavity resonator'spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, means included in each of said first and second resonators to tune each of said resonators independent of one another, an inductive coupling loop for energy exchange between said first and second resonators, said coupling loop forming a component of said second resonator, and means to adjust the physical position of said coupling loop to adjust the coeflicient of coupling between said first and second cavities; adjustable means to couple radio frequency energy directly into said second resonator independently of said first resonator; a resistor; and means to adjustably couple said resistor
  • a broadband velocity modulation electron discharge device comprising means to project an electron beam along a given path; a double tuned circuit disposed in energy exchanging relationship with said electron beam including a rectangular waveguide resonator having a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with said waveguide resonator, a coaxial cavity resonator spaced radially from said beam path, the outer conductor of said coaxial resonator being integral with the wall of said waveguide resonator, means included in each of said waveguide and coaxial resonators to tune each of said resonators independent of one another, an inductive coupling loop extending from the inner conductor of said coaxial resonator for energy exchange between'saidrwaveguide-and coaxial resonators, means to adjust the physical position of saidcoupling'loop to adjust the coefficient of coupling between said coaxial and waveguide resonators;
  • a resistor an adjustableinductive loop coupling said resisto increase the ettective bandwidth of said discharge device; conductive means spaced from the center conductor of said coaxial resonator t capacitively couple radio frequency energy directly into said coaxial resonator independently of said waveguide resonator; and means to adjust the spacing between said conductive means and the center conductor of said coaxial resonator to adjust the amount of energy coupled into said coaxial resonator.
  • a broadband velocity modulation electron discharge device comprising means to project an electron beam along a given path; a double tuned circuit disposed in energy exchanging relationship with said electron beam including a rectangular waveguide resonator having a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with said waveguide resonator, a coaxial cavity resonator spaced radially from said beam path, the outer conductor of said coaxial resonator and the wall of said waveguide resonator being integral, means included in each of said waveguide and coaxial resonatorsto tune each of said resonators independent of one another, aninductive coupling loop extending from the center conductor of said coaxial resonator for energy exchange between said waveguide and coaxial resonators, and means to'adjust the physical location of said coupling looptto adjust the coetficient of coupling between said waveguide and coaxial resonators; a resistor; conductive means coupled to said resistor and spaced from the center conductor of said co
  • a broadband velocity modulation electron discharge device comprising an electron beam forming means to project an electron beam along a given path; a radio frequency input circuit disposed adjacent said beam forming means including a double tuned circuitdisposed in energy exchanging relationship with said electron beam having a first cavity resonator including a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with said first resonatona second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, inductive coupling means for energy exchange between said first'and second resonators, means included in each of said first and second resonators to tune each of said resonators independent of one another, a resistor, means coupling said resistor.
  • a radio frequency output circuit disposed remote from said beamrforming means including a double tuned circuit having a first cavity resonator including a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with said first resonator, a second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, inductive coupling means for energy exchange between said first and second resonators, means included in each of said first and second resonators to tune each of said resonators independent of one another, and means to couple radio frequency energy directly from said second resonator independently of said first resonator; and a plurality of intermediate double tuned circuit elements disposed intermediate said input and output circuits in energy exchanging relationship.
  • each of said intermediate circuit elements including a first cavity resonator having a gap therein coaxial of said beam path for passage therethrough in energy exchanging relationship with said first resonator, a second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first resonator, inductive coupling means for energy exchange between said first and second resonators, means included in each of said first and second resonators to tune each of said resonators independent of one another, a resistor, and means coupling said r'esistordirectly tosaid second resonator independently of said first resonator.
  • a broadband velocity modulation electron discharge device comprising an electron beam forming means to project an electron beam along a given path; a radio frequency input circuit disposed adjacent said beam forming means including a double tuned circuit disposed in energy exchanging relationship with said electron beam having a rectangular waveguide resonator including a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchangng relationship with said waveguide resonator, a coaxial resonator spaced radially from said beam path and having the outer conductor thereof integral with the wall of said waveguide resonator, an inductive coupling loop extending from the center conductor of said coaxial resonator for energy exchange between said first and second resonators, means included in each of said waveguide and coaxial resonators to tune each of said resonators independent of one another, means to adjust the physical position of said coupling loop to adjust the coefiicient of coupling between said waveguide and coaxial resonators, a resistor, means capacitively coupling said resistor to said
  • each of said intermediate circuit elements including a waveguide resonator having a gap therein coaxial of said beam path for passage there through in energy exchanging relationship with said waveguide resonator, a coaxial resonator spaced radially from said beam path and having the outer conductor thereof integral with the wall of said waveguide resonator, an inductive coupling loop extending from the center conductor of said coaxial resonator for energy exchange between said first and second resonators, means included ineach of said waveguide and coaxial resonators to time each of said resonators independent of one another, a resistor, and means capacitively
  • a broadband velocity modulation electron dis charge device comprising means to project an electron beam along a given path; and a double tuned circuit to increase the effective bandwidth of said discharge device disposed in energy exchanging relationship with'said electron beam including a first cavity resonator having a gap therein coaxial of said beam path for passage of said electron beam therethrough in energy exchanging relationship with saidfirst resonator, a second cavity resonator spaced radially from said beam path and having its outer wall integral with the outer wall of said first included in said waveguide resonator to tune said waveresonator, means included in said first resonator to tune guide resonator independent of said coaxial resonator, an said first resonator independent of said second resonator, inductive coupling loop extending from the center conan inductive coupling loop for energy exchange between ductor of sa1d coax1a1 resonator for energy exchange said first and second resonators, a tuning arrangement 5 between said waveguide and coaxial resonators, a tuning for
  • charge device comprising means to project an electron beam along a given path; and a double tuned circuit to 15 References Cited in the file of this patent increasethe effective bandwidth of said discharge device UNITED STATES PATENTS disposed in energy exchanging relationship with said Re 23 284 McArthm.

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US665337A 1957-06-12 1957-06-12 Velocity modulation electron discharge device Expired - Lifetime US2934672A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
NL233762D NL233762A (US07915450-20110329-C00059.png) 1957-06-12
BE568536D BE568536A (US07915450-20110329-C00059.png) 1957-06-12
US665337A US2934672A (en) 1957-06-12 1957-06-12 Velocity modulation electron discharge device
GB38653/57A GB826090A (en) 1957-06-12 1957-12-12 Improvements in or relating to microwave amplifiers
FR767226A FR73294E (fr) 1957-06-12 1958-06-05 Perfectionnements aux tubes à ondes progressives
GB18149/58A GB887195A (en) 1957-06-12 1958-06-06 Velocity modulation electron discharge device
US766514A US2960658A (en) 1957-06-12 1958-10-10 Microwave amplifiers
CH355223D CH355223A (fr) 1957-06-12 1958-11-04 Amplificateur pour hyperfréquences
FR781447A FR1217880A (fr) 1957-06-12 1958-12-11 Amplificateur pour hyperfréquences
CH356830D CH356830A (fr) 1957-06-12 1959-07-07 Accouplement à induction électromagnétique

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US665337A US2934672A (en) 1957-06-12 1957-06-12 Velocity modulation electron discharge device
GB355223X 1957-12-12

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US766514A Expired - Lifetime US2960658A (en) 1957-06-12 1958-10-10 Microwave amplifiers

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BE (1) BE568536A (US07915450-20110329-C00059.png)
CH (1) CH355223A (US07915450-20110329-C00059.png)
FR (1) FR1217880A (US07915450-20110329-C00059.png)
GB (2) GB826090A (US07915450-20110329-C00059.png)
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Cited By (10)

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US3169206A (en) * 1959-08-06 1965-02-09 Varian Associates High frequency tube method and apparatus
US3210593A (en) * 1960-05-25 1965-10-05 Varian Associates Method and apparatus for the broadbanding of power type velocity modulation electron discharge devices by interaction gap spacing
US3221205A (en) * 1962-05-23 1965-11-30 Hughes Aircraft Co Traveling-wave tube with trap means for preventing oscillation at unwanted frequencies
US3221204A (en) * 1961-11-20 1965-11-30 Hughes Aircraft Co Traveling-wave tube with trap means for preventing oscillation at unwanted frequencies
US3248593A (en) * 1962-02-16 1966-04-26 Gen Electric Multiple beam radio frequency apparatus having cooperating resonators and mode suppression means
US3365607A (en) * 1963-09-20 1968-01-23 Varian Associates Electron discharge device
DE1298200B (de) * 1960-09-06 1969-06-26 Varian Associates Mehrkammerklystronverstaerkerroehre grosser Bandbreite
US3725721A (en) * 1971-05-17 1973-04-03 Varian Associates Apparatus for loading cavity resonators of tunable velocity modulation tubes
US3904917A (en) * 1973-05-24 1975-09-09 Nippon Electric Co High-efficiency broadband klystron amplifier of reduced length
US6191651B1 (en) 1998-04-03 2001-02-20 Litton Systems, Inc. Inductive output amplifier output cavity structure

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SU947927A1 (ru) * 1978-12-12 1982-07-30 Предприятие П/Я В-2058 Способ корректировки фазового сдвига в усилительном многорезонаторном клистроне

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US2280824A (en) * 1938-04-14 1942-04-28 Univ Leland Stanford Junior Radio transmission and reception
US2284405A (en) * 1940-08-17 1942-05-26 Gen Electric High frequency apparatus
US2446572A (en) * 1941-04-11 1948-08-10 Emi Ltd Damping circuit embodying electron discharge devices of the velocity modulation type
USRE23284E (en) * 1950-10-17 Ultra high frequency electric dis
US2556978A (en) * 1948-10-07 1951-06-12 Bell Telephone Labor Inc Linear accelerator for charged particles
US2610307A (en) * 1940-07-02 1952-09-09 Univ Leland Stanford Junior Tunable cavity resonator electron discharge device
US2789250A (en) * 1952-07-30 1957-04-16 Varian Associates High frequency device
US2790928A (en) * 1952-10-11 1957-04-30 Bell Telephone Labor Inc Electron discharge devices of the klystron type

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US2416303A (en) * 1941-02-05 1947-02-25 Bell Telephone Labor Inc Secondary emissive shell resonator tube
US2379819A (en) * 1941-03-07 1945-07-03 Bell Telephone Labor Inc Frequency modulator
BE480319A (US07915450-20110329-C00059.png) * 1946-04-12

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Publication number Priority date Publication date Assignee Title
USRE23284E (en) * 1950-10-17 Ultra high frequency electric dis
US2280824A (en) * 1938-04-14 1942-04-28 Univ Leland Stanford Junior Radio transmission and reception
US2610307A (en) * 1940-07-02 1952-09-09 Univ Leland Stanford Junior Tunable cavity resonator electron discharge device
US2284405A (en) * 1940-08-17 1942-05-26 Gen Electric High frequency apparatus
US2446572A (en) * 1941-04-11 1948-08-10 Emi Ltd Damping circuit embodying electron discharge devices of the velocity modulation type
US2556978A (en) * 1948-10-07 1951-06-12 Bell Telephone Labor Inc Linear accelerator for charged particles
US2789250A (en) * 1952-07-30 1957-04-16 Varian Associates High frequency device
US2790928A (en) * 1952-10-11 1957-04-30 Bell Telephone Labor Inc Electron discharge devices of the klystron type

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169206A (en) * 1959-08-06 1965-02-09 Varian Associates High frequency tube method and apparatus
US3249794A (en) * 1959-08-06 1966-05-03 Varian Associates High frequency tube method and apparatus
US3210593A (en) * 1960-05-25 1965-10-05 Varian Associates Method and apparatus for the broadbanding of power type velocity modulation electron discharge devices by interaction gap spacing
DE1298200B (de) * 1960-09-06 1969-06-26 Varian Associates Mehrkammerklystronverstaerkerroehre grosser Bandbreite
US3221204A (en) * 1961-11-20 1965-11-30 Hughes Aircraft Co Traveling-wave tube with trap means for preventing oscillation at unwanted frequencies
US3248593A (en) * 1962-02-16 1966-04-26 Gen Electric Multiple beam radio frequency apparatus having cooperating resonators and mode suppression means
US3221205A (en) * 1962-05-23 1965-11-30 Hughes Aircraft Co Traveling-wave tube with trap means for preventing oscillation at unwanted frequencies
US3365607A (en) * 1963-09-20 1968-01-23 Varian Associates Electron discharge device
US3725721A (en) * 1971-05-17 1973-04-03 Varian Associates Apparatus for loading cavity resonators of tunable velocity modulation tubes
US3904917A (en) * 1973-05-24 1975-09-09 Nippon Electric Co High-efficiency broadband klystron amplifier of reduced length
US6191651B1 (en) 1998-04-03 2001-02-20 Litton Systems, Inc. Inductive output amplifier output cavity structure

Also Published As

Publication number Publication date
BE568536A (US07915450-20110329-C00059.png)
GB826090A (en) 1959-12-23
CH355223A (fr) 1961-06-30
NL233762A (US07915450-20110329-C00059.png)
GB887195A (en) 1962-01-17
FR1217880A (fr) 1960-05-06
US2960658A (en) 1960-11-15

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