US2890370A - Travelling wave tubes - Google Patents

Travelling wave tubes Download PDF

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Publication number
US2890370A
US2890370A US407732A US40773254A US2890370A US 2890370 A US2890370 A US 2890370A US 407732 A US407732 A US 407732A US 40773254 A US40773254 A US 40773254A US 2890370 A US2890370 A US 2890370A
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US
United States
Prior art keywords
helix
tube
wave
wave guide
electron beam
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
US407732A
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English (en)
Inventor
Rogers Douglas Cecil
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 claimed from GB839453A external-priority patent/GB755834A/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority claimed from GB18181/54A external-priority patent/GB787181A/en
Application granted granted Critical
Publication of US2890370A publication Critical patent/US2890370A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/029—Schematic arrangements for beam forming
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
    • C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
    • C07D261/06—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members
    • C07D261/10—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D261/18—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
    • C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D317/46—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
    • C07D317/48—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring
    • C07D317/62—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to atoms of the carbocyclic ring
    • C07D317/66—Nitrogen atoms not forming part of a nitro radical
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/0404—Control of fluid pressure without auxiliary power with two or more controllers mounted in parallel
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/12—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid
    • G05D23/125—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • 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
    • 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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/06—Electron or ion guns
    • H01J23/065—Electron or ion guns producing a solid cylindrical beam
    • 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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • 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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/42—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit the interaction circuit being a helix or a helix-derived slow-wave structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
    • H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
    • H01J25/38—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the forward travelling wave being utilised
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode

Definitions

  • One of the forms of slow wave structure mostcommonly in use to-day is a conductor formed as a helix surrounding the electron beam and contained within the evacuatedenvelope of the travelling wave tube. It is common practice to pass the travelling wave tube through a section of hollow rectangular wave guide, so as to position an end or the helix just within the wave guide, a lhigh'fr equency choke being provided opposite the said end of the helix by means of a choke member inside the tube envelope which is coaxial with an outer choke member continuous with the wave guide wall.
  • the end of the helix is joined to the inner choke member by a straight rod which behaves as a probe antenna, one end of which is efiectively at earth potential by virtue of the capacitative coupling between the inner and outer choke members, the other end being in electrical and mechanical contact with the helix.
  • the system is somewhat analogous to that of an earthed quarter-wave antenna.
  • the electron beam must travel the length of the antenna before entering the helix and, therefore, there is a noneifective region of the axial length of the electron beam on which interaction with the electromagnetic waves does not occur. Not only does this non-eifective region of the electron beam result in an increased length of the travelling-wave tube, which is undesirable purely from the aspect of physical size, but it increases the difiiculty of maintaining the electron beam in focus over the length of the tube in which interaction takes place.
  • a travelling wave tube comprising a helix, means for projecting an electron beam along the axis of the helix and means for coupling the helix to a wave guide comprising a probe member one end of which is connected to the helix whereas the other end is connected to another member in the tube which is adapted to form electrically a part of the wave guide wall, the said probe member being shaped to bring the end of the helix so close to the said other member that the helix extends through a substantial portion of the width of the wave guide.
  • the probe member is U-shaped.
  • a travelling wave tube comprising electrode means for projecting an electron beam along an axis to an electron'collector electrode, a helix surrounding the said axis for propagating electromagnetic waves in a slow mode to intercharge energy with the said beam and co-operating, during operation of the tube, with a wave guide through which the tube projects; means for coupling the said helix as a transmission path to the said wave guide, the said means comprising a generally U shaped probe having arms parallel to the said axis, one arm being secured to the end of the helix and the end of the other arm being secured so that, during operation of the tube, it is capacitatively coupled to the wall of the said wave guide opposite the said end of the helix.
  • Fig. 1 shows, diagrammatically, a travelling-wave tube according to the present invention inserted in its cooperating apparatus
  • Fig. 2 is a diagram illustrating a known method of coupling between helix and rectangular wave guide
  • Fig. 3 illustrates the coupling arrangement of the present invention.
  • a travelling wave tube 1 comprises an electron gunhoused within a bulb portion 2 of a tube envelope which is provided with an end cap 3 carrying connecting pins for supplying the appropriate polarising potentials to the tubeelectrodes.
  • the base also carries a locating flange 5 for positioning the tube within the associated apparatus, but as we are not here concerned with the mounting arrangements of the tube within its associated apparatus, nor with the means for mounting the components of the travelling wave tube within the tube envelope, in order to simplify the drawings these items have not been shown in any of the figures.
  • a collector electrode 6 is provided, carrying a cooling member 7. Between the bulb 2 and the collector electrode 6 the envelope of the tube is of reduced diameter and surrounds a helix 8.
  • the travelling wave tube 1 projects through an input wave guide 9 near the electron gun end and an output wave guide 10 near the collector electrode, for coupling to the respective ends of the helix, the wave guides being provided with extensions 11 and 12, respectively, each provided with a short-circuiting plunger 13 to adjust the impedance match between the respective rectangular wave guides and the helix.
  • high frequency chokes are provided passage of the electron beam.
  • the coupling means between each of the wave guides 9 and 10 and the respective end of the helix comprises a probe antennae 16 connected between the inner choke member 15 and the adjacent end turn of the helix, and will be more fully described below.
  • the travelling wave tube 1 is shown surrounded by a set of solenoids 17, 18 and 19 respectively, which are energised during operation to provide the requisite axial magnetic field for guiding the electron beam between the electron gun and the collector electrode 6.
  • Fig. 2 illustrates diagrammatically, a common prior coupling arrangement used with travelling wave apparatus in other respects fundamentally similar to that of Fig. 1.
  • An input or output feeder wave guide is shown in section at continuous with an extension 21 containing a short-circuiting piston 22.
  • An outer wave guide choke member 23 projects from the rear wall 24 of the wave guide.
  • the travelling wave tube envelope 25 projects through the wave guide section 20, 21 and encloses a helix 26 and an inner choke member 27 in the form of a hollow cylinder partially closed by an end disc 28 apertured at 29 for passage of the electron beam. Due to the capacitative coupling between members 23 and 27, the disc 28 is effectively a continuation of the rear wave guide wall 24.
  • a rod 30 is secured to the disc 28 and projects parallel to the axis of the electron beam and helix across the wave guide 20. A few turns of the helix 26 project inside the wave 'guide 20, the end turn being secured to the end 31 of the rod 30, which rod forms a probe antenna virtually earthed at one end by the disc 28.
  • the length of the probe antenna would commonly be of the order of 0.4 inch, which, if reproduced at both ends of the tube may amount to an appreciable fraction of the total length over which the electron beam focussing is critical. A saving of even some of this extra length results in a very worth while reduction in the size and weight of the focussing coils and associated structure of the travelling wave apparatus. This reduction is achieved in the present invention by utilising a folded construction for the antennae in place of the straight rod 30.
  • a U shaped probe antenna 32 is provided having unequal legs parallel to the axis of the electron beam and helix.
  • the longer leg 33 is secured to the disc 28 and the end 34 of the shorter leg is joined to the end of the helix 26.
  • the end of the helix must not, of course, protrude beyond the rear wall 24 of the wave guide and must certainly not foul the disc 28, for which reasons it is necessary that the arms of member 32 must be of unequal length. The difference between them may, however, be quite small and the optimum dimensions and proportioning of the probe antennae are best determined empirically.
  • the wave guide 20 had transverse dimensions of 2 in. x inch and the helix consisted of 0.028 inch diameter wire, Wound at 20 turns per inch with an internal diameter of 0.131 inch.
  • a suitable probe antenna had the base of the U, flattened at right angles to the arms, the internal separation between which was 0.125 inch.
  • the plane of the U was substantially parallel to the helix.
  • the overall length from the base of the U to the end of the longer leg secured to the disc 28 was 0.650 inch, the other leg, being shorter by 0.100 inch.
  • the invention is equally applicable to the coupling between a rectangular wave guide and a short length of helix which can be used, for example, to launch space charge waves upon an electron beam.
  • the plane of the U of the probe antenna was substantially parallel to the axis of the helix; in other embodiments it has been convenient to have the plane of the U at right angles to the helix axis.
  • a travelling wave tube comprising electrode means for projecting an electron beam along an axis to an electron collector electrode, a helix surrounding the said axis for propagating electromagnetic waves in a slow mode to intercharge energy with the said beam and cooperating, during operation of the tube, with a wave guide through which the tube projects; means for coupling the said helix as a transmission path to the said wave guide, the said means comprising a hollow cylindrical element of substantially the same outer diameter as the diameter of said helix capacitively coupled to the wall of the said wave guide opposite the said end of the helix, a generally U shaped probe having arms parallel to the said axis, one arm being secured to the end of the helix and extending along said helix away from said end and the end of the other arm being secured to said cylindrical element.
  • a tube according to claim 1 in which said cylin der element comprises an inner wave guide choke member further comprising an outer choke member surrounding the said tube and projecting from the rear of the said wave guide opposite the said end of the helix.

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  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Theoretical Computer Science (AREA)
  • Microwave Tubes (AREA)
  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Waveguides (AREA)
US407732A 1953-03-26 1954-02-02 Travelling wave tubes Expired - Lifetime US2890370A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB328589X 1953-03-26
GB839453A GB755834A (en) 1953-03-26 1953-03-26 Improvements in or relating to the coupling of a helix in a travelling wave tube or the like to a waveguide
GB28268/53A GB762106A (en) 1953-03-26 1953-10-14 Improvements in or relating to travelling wave tubes
GB18181/54A GB787181A (en) 1953-03-26 1954-06-21 Improvements in or relating to travelling wave tubes
DEL19900A DE1001360B (de) 1953-03-26 1954-09-14 Ankopplungsanordnung fuer Wanderfeldroehren

Publications (1)

Publication Number Publication Date
US2890370A true US2890370A (en) 1959-06-09

Family

ID=61021422

Family Applications (5)

Application Number Title Priority Date Filing Date
US407732A Expired - Lifetime US2890370A (en) 1953-03-26 1954-02-02 Travelling wave tubes
US447173A Expired - Lifetime US2824996A (en) 1953-03-26 1954-08-02 Travelling wave tubes
US502811A Expired - Lifetime US2871392A (en) 1953-03-26 1955-04-21 Travelling wave tubes
US529818A Expired - Lifetime US2908843A (en) 1953-03-26 1955-08-22 Coupling arrangement for traveling wave tubes
US530224A Expired - Lifetime US2918593A (en) 1953-03-26 1955-08-24 Traveling wave tubes

Family Applications After (4)

Application Number Title Priority Date Filing Date
US447173A Expired - Lifetime US2824996A (en) 1953-03-26 1954-08-02 Travelling wave tubes
US502811A Expired - Lifetime US2871392A (en) 1953-03-26 1955-04-21 Travelling wave tubes
US529818A Expired - Lifetime US2908843A (en) 1953-03-26 1955-08-22 Coupling arrangement for traveling wave tubes
US530224A Expired - Lifetime US2918593A (en) 1953-03-26 1955-08-24 Traveling wave tubes

Country Status (7)

Country Link
US (5) US2890370A (xx)
BE (7) BE529619A (xx)
CH (5) CH322461A (xx)
DE (4) DE1099093B (xx)
FR (13) FR66255E (xx)
GB (6) GB742070A (xx)
NL (4) NL200402A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062983A (en) * 1959-04-28 1962-11-06 Gen Electric High frequency energy interchange device
US3729644A (en) * 1970-12-04 1973-04-24 Nippon Electric Co Helix traveling-wave tube

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US2654952A (en) * 1951-03-01 1953-10-13 Philip O Solon Ellipsograph
US2940020A (en) * 1952-04-08 1960-06-07 Int Standard Electric Corp Focusing magnet for long electron beams
DE1232532B (de) * 1956-07-11 1967-01-19 W App Nfabriek N V As Druckregler fuer Brenngase
US3027484A (en) * 1958-03-29 1962-03-27 Kobe Kogyo Kabushiki Kaisha Periodic magnetic focussing system for travelling wave tubes
DE1276217B (de) * 1958-06-25 1968-08-29 Siemens Ag Elektronenstrahlroehre mit Geschwindigkeitsmodulation, insbesondere Lauffeldroehre
GB869714A (en) * 1958-12-17 1961-06-07 Mullard Ltd Travelling-wave tubes
DE1090732B (de) * 1959-05-02 1960-10-13 Telefunken Gmbh Koaxiale Ankoppelvorrichtung fuer eine Hochfrequenzroehre
US3032677A (en) * 1959-05-08 1962-05-01 Raytheon Co Traveling wave tubes
DE1136425B (de) * 1959-07-17 1962-09-13 Philips Nv Anordnung zum Ankoppeln der wendelfoermigen Verzoegerungsleitung einer Lauffeldroehre an einen quer zur Wendelachse verlaufenden Hohlleiter
IT699974A (xx) * 1959-12-10
US3134925A (en) * 1960-09-12 1964-05-26 Westinghouse Electric Corp Magnetic structure for providing smooth uniform magnetic field distribution in traveling wave tubes
US3211947A (en) * 1962-05-14 1965-10-12 Bloom Stanley Noise reduction of traveling-wave tubes by circuit refrigeration
US3324337A (en) * 1963-12-02 1967-06-06 Varian Associates High frequency electron discharge device and focusing means therefor
GB1145469A (en) * 1967-08-24 1969-03-12 Standard Telephones Cables Ltd Cooler for a travelling wave tube
JPS5868846A (ja) * 1981-10-07 1983-04-23 バリアン・アソシエイツ・インコ−ポレイテツド 永久磁石で集束される線形ビ−ムマイクロ波管
FR2641899A1 (fr) * 1989-01-17 1990-07-20 Thomson Tubes Electroniques Canon a electrons muni d'un dispositif actif produisant un champ magnetique au voisinage de la cathode
US5332947A (en) * 1992-05-13 1994-07-26 Litton Systems, Inc. Integral polepiece RF amplification tube for millimeter wave frequencies
GB9418028D0 (en) * 1994-09-07 1994-10-26 Eev Ltd Cavity arrangements

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US2611102A (en) * 1948-11-13 1952-09-16 Sylvania Electric Prod Traveling wave tube
US2632130A (en) * 1947-11-28 1953-03-17 Joseph F Hull High current density beam tube
US2636948A (en) * 1946-01-11 1953-04-28 Bell Telephone Labor Inc High-frequency amplifier
US2730649A (en) * 1950-02-04 1956-01-10 Itt Traveling wave amplifier
US2758244A (en) * 1952-06-02 1956-08-07 Rca Corp Electron beam tubes
US2773213A (en) * 1951-03-13 1956-12-04 Rca Corp Electron beam tubes

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US2636948A (en) * 1946-01-11 1953-04-28 Bell Telephone Labor Inc High-frequency amplifier
US2632130A (en) * 1947-11-28 1953-03-17 Joseph F Hull High current density beam tube
US2611102A (en) * 1948-11-13 1952-09-16 Sylvania Electric Prod Traveling wave tube
US2730649A (en) * 1950-02-04 1956-01-10 Itt Traveling wave amplifier
US2773213A (en) * 1951-03-13 1956-12-04 Rca Corp Electron beam tubes
US2758244A (en) * 1952-06-02 1956-08-07 Rca Corp Electron beam tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062983A (en) * 1959-04-28 1962-11-06 Gen Electric High frequency energy interchange device
US3729644A (en) * 1970-12-04 1973-04-24 Nippon Electric Co Helix traveling-wave tube

Also Published As

Publication number Publication date
FR70719E (fr) 1959-07-10
FR66226E (fr) 1956-06-05
FR66255E (fr) 1956-06-28
BE541462A (xx) 1900-01-01
DE1001360B (de) 1957-01-24
US2824996A (en) 1958-02-25
US2908843A (en) 1959-10-13
GB787603A (en) 1957-12-11
US2871392A (en) 1959-01-27
CH351679A (de) 1961-01-31
NL200290A (xx) 1900-01-01
FR73213E (fr) 1960-09-23
GB836219A (en) 1960-06-01
FR67269E (fr) 1958-02-19
DE1109272B (de) 1961-06-22
BE527620A (xx) 1900-01-01
CH328589A (de) 1958-03-15
BE539158A (xx) 1900-01-01
FR73991E (fr) 1960-10-31
CH334859A (de) 1958-12-15
FR69376E (fr) 1958-11-06
FR69772E (fr) 1958-12-30
GB762106A (en) 1956-11-21
FR72041E (fr) 1960-03-21
NL230187A (xx) 1900-01-01
FR68866E (fr) 1958-06-11
NL200402A (xx) 1900-01-01
FR67270E (fr) 1958-02-19
BE541278A (xx) 1900-01-01
BE532535A (xx) 1900-01-01
FR66266E (fr) 1956-06-28
BE570152A (xx) 1900-01-01
CH336509A (de) 1959-02-28
GB742070A (en) 1955-12-21
DE1099093B (de) 1961-02-09
US2918593A (en) 1959-12-22
BE529619A (xx) 1900-01-01
GB831514A (en) 1960-03-30
FR73056E (fr) 1960-09-22
GB799236A (en) 1958-08-06
CH322461A (de) 1957-06-15
NL191459A (xx) 1900-01-01
DE1108336B (de) 1961-06-08

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