US2263248A - Oscillation generation system - Google Patents

Oscillation generation system Download PDF

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Publication number
US2263248A
US2263248A US286996A US28699639A US2263248A US 2263248 A US2263248 A US 2263248A US 286996 A US286996 A US 286996A US 28699639 A US28699639 A US 28699639A US 2263248 A US2263248 A US 2263248A
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US
United States
Prior art keywords
tank
electrons
conductor
gaps
inner conductor
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
US286996A
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English (en)
Inventor
Walter Van B Roberts
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
Application filed by RCA Corp filed Critical RCA Corp
Priority to US286996A priority Critical patent/US2263248A/en
Priority to DER108022D priority patent/DE735968C/de
Priority to GB12309/40A priority patent/GB542970A/en
Priority to CH220365D priority patent/CH220365A/de
Application granted granted Critical
Publication of US2263248A publication Critical patent/US2263248A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J25/02—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
    • H01J25/06—Tubes having only one resonator, without reflection of the electron stream, and in which the modulation produced in the modulator zone is mainly velocity modulation, e.g. Lüdi-Klystron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns

Definitions

  • One object of the present invention is to provide a self-excited oscillator 01 the type wherein energy is transferred from an electron beam by electrostatic induction to a resonant circuit.
  • a further object is to provide in connection with such an oscillator an electromagnetic wave horn for radiating energy produced by said oscillator.
  • Amplifiers of a similar sort have also been described employing feed back of oscillations between a pair of tanks, one of which utilizes its coupling with the electron stream to cause the electrons to bunch together in the manner prerequisite to delivering high frequency power to the second tank.
  • the generation of oscillations is simplified by the utilization of a single tank both for the bunching of the beam and also for absorbing power from the beam.
  • the tank consists of a concentric line whose inner conductor is a particular length and spaced axially at both ends from the outer conductor. An electron stream is caused to traverse the interior of the inner conductor across the gaps at both ends.
  • Fig. 1 which shows so much of the construction of an oscillator in accordance with the present invention asis necessary for an understanding thereof, there is shown a high velocity electron beam I produced by an electron gun I, 65
  • Inner conductor 2 is designed to be electrically one-half wavelength long (M2) or a multiple thereof at the operating frequency.
  • M2 one-half wavelength long
  • the narrow gap 4 is located between that end of the inner conductor 2 nearest the electron gun and a flange which is connected to the outer conductor 3 and turned in on the same straight line as the inner conductor.
  • the velocity of the beam can be controlled by the potentials applied to the accelerating electrodes, not shown; thus by varying the velocity of electron beam i we can get proper electron transit time so that the groups of electrons pass gap 5 and move in opposition to the instantaneous electric field along the axis of the tube, thereby delivering power to the tank.
  • the inner conductor 2 By designing the inner conductor 2 to have a length which is a multiple of half the length of the resonant period of the tank, there may be obtained oscillations at some higher mode of oscillation of the tank than its fundamental.
  • 'Ihe' beam after passing through the tank; is received upon a collector electrode 6 which is maintained at a sufficiently positive potential to insure collection.
  • the electron gun I, beam I and collector electrode 6 are inclosed in an evacuated glass envelope 8.
  • the means for generating the beam radiate power directly into the ether through the medium of an electromagnetic wave horn
  • the field at the output end of conductor 2?. is worked against by the bunched beam 11 to sustain oscillations exactly as in Fig. l, but in Fig. 2 the outer conductor instead of shielding the oscillatory field within the tank is flared out into a conical horn 3 through which the lines of force tend to slide out without reflection, and hence result in the radiation of power.
  • an iris diaphragm ii may be installed at the small end of the horn to reduce the radiation to the extent desired. This diaphragm regulates the ratio of energy radiated per cycle to the circulating energy in the tank.
  • This invention finds particular application in the ultra short wave field below five meters, especially below one meter.
  • An electron discharge device circuit having atank, said tank being comprised of an outer conductor and a single hollow inner coaxially arranged conductor separated axially at both ends from said outer conductor bygaps, the length of said inner conductor between said gaps being a multiple including unity of one-half the length of the operating wave corresponding to the resonant period of said tank, a source of electrons for projecting a stream of electrons, through the entire length of said hollow inner conductor and across said gaps in succession, and means for attracting and collecting the elec-, trons crossing the last gap to be traversed by said electrons.
  • An electron discharge device having a cathode for supplying electrons, a collector electrode spaced from said cathode for receiving said electrons, means including a single oscillating tank circuit having a pair of spaced coaxial tubular members arranged to provide a pair of spaced gaps of unequal length between said coaxial tubular members, said gaps being located substantially at the ends of said tubular members, the smaller one of said gaps being nearer said cathode than said other gap and located between one end of the inner tubular member and a flange which is connected to the outer conductor and turned in on the same straight line as the inner conductor, said tubular members being so positioned between the cathode and collector electrode that electrons moving from the cathode to the collector electrode will be modulated by said first gap and pass axially through the tubular members and deliver energy to said tank by virtue of the second gap to be traversed by said electrons.
  • An electron discharge device having a cathode for supplying electrons, a collector electrode spaced from said cathode for receiving said electrons, means including a single oscillating tank circuit having a pair of spaced coaxial tubular members arranged to provide a pair of spaced gaps of unequal length between said coaxial tubular members at or near the ends thereof, the length of the inner tubular member between said gaps being electrically a multlpe, including unity, of one-half the length of the operating wave of said tank, said tubular members being so positioned between the cathode and collector electrode that electrons moving from the cathode to the collector electrode will pass axially through the tubular members and across said gaps in succession.
  • An electron discharge device having a cathode for supplying electrons, a collector electrode spaced from said cathode for receiving said electrons, means including an oscillating tank circuit having a pair of coaxial tubular members spaced axially to provide a pair of spaced gaps of unequal length between said coaxial tubular members, the length of the inner tubular mem ber between said gaps being electrically 9. multiple, including unity, of one-hall.
  • Oscillation generator comprising a single concentric line resonator having an outer conductor and a single hollow inner conductor which is a multiple including unity of one-half of the length of the operating wave, the outer conductor of said resonator being provided with flanges at both ends turning in on the same straight line as the inner conductor to provide gaps at both ends between the flanges and the inner conductor. of the resonator, means for causing an electron beam to traverse said resonator along its axis and to pass across both gaps in succession, and means for collecting the emerging beam.
  • a hollow conductor resonant tank circuit a hyperfrequency load circuit of the guided wave type coupled to said tank circuit for energy transfer therebetween, the coupling between said load and tank being sufiiciently loose so that aconsiderable sharpness of resonance of said tank circuit is maintained, a i
  • variable diaphragm comprising the output end of said tank circuit for regulating the ratio of energy radiated by said load circuit to the circulating energy in the tank, and means for projecting electrons through the interior of said tank in a direction to cause the electrons to emerge at the end to which said load circuit is coupled for exciting short wave oscillations in said tank circuit.
  • a hollow conductor resonant tank circuit a load circuit in the form of an electromagnetic wave horn coupled to one end of said tank circuit for energy transfer therebetwee'n, the coupling between said load and tank being sufliciently loose so that a considerable sharpness of resonance of said tank circuit is maintained, a variable diaphragm comprising said one end of said ta'nk circuit for regulating the ratio of energy radiated by said load circuit to the circulating energy in the tank, and means for projecting electrons through the interior of said tank in a direction to cause the electrons to emerge at the end to which saidload circuit is coupled for exciting short Wave oscillations in said tank circuit.
  • a concentric line resonant tank having an inner and an outer-conductor, said outer conductor being flared out at one end in the form of an electromagnetic horn, and a flange at the other end of said outer conductor and turned in on the same straight line as said inner conductor to provide a gap thcreacross.
  • Oscillation generator comprising a single concentric line resonator having an outer conductor and a single hollow inner conductor which aaeaaee is a multiple including unity of one-half of the length of the operating wave, the outer conductor of said resonator being provided at one end with a flange turning in on the same straight line as the inner conductor to provide a gap therebetween, said outer conductor being electrically spaced from said inner conductor at the other end to provide another gap, means for causing an electron beam to transverse the Y resonator along its axis and to pass across both gaps, and means for collecting the beam emerging from said resonator.
  • a concentric line resonant tank having an 'inner and an outer conductor, said outer conductor being flared out at one end in the form of an electromagnetic horn, an iris diaphragm at said one end of said outer conductor, and a flange at the other end of said outer conductor and turned in on the same straight line as said inner conductor to provide a gap thereacross, and means for projecting a stream of charged particles along the axis of said inner conductor and through the entire length of said inner conductor.
  • a concentric line resonant 25 said outer conductor being flared out at one end in the form of an electromagnetic horn, a flange at the other end of said outer conductor and turned in on the same straight line as said inner conductor to p:ovide a gap thereacross, an electron gun for projecting electrons across said gap and axially through the interior of said inner conductor, and a collector electrode for collecting the electronsemerging from the tank.
  • a resonant electrode system including a conductive structure surrounding the beam for a substantial portion of its path length, and including a single conductive tubular element a multiple, including unity, of a half wave long concentrically positioned Within said structure so as to be axially traversed by the beam and spaced at its extremities from said conductive structure to provide a pair of gaps to be traversed by said electron beam, the length of said tubular element being correlated to the average velocity of the beam and to the desired frequency of operation of the apparatus.

Landscapes

  • Particle Accelerators (AREA)
  • Transducers For Ultrasonic Waves (AREA)
US286996A 1939-07-28 1939-07-28 Oscillation generation system Expired - Lifetime US2263248A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US286996A US2263248A (en) 1939-07-28 1939-07-28 Oscillation generation system
DER108022D DE735968C (de) 1939-07-28 1940-07-28 Roehrenanordnung zur Anfachung ultrakurzer Wellen
GB12309/40A GB542970A (en) 1939-07-28 1940-07-29 Improvements in oscillation generation systems
CH220365D CH220365A (de) 1939-07-28 1941-03-26 Vorrichtung zum Erzeugen von Ultrahochfrequenzschwingungen.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US286996A US2263248A (en) 1939-07-28 1939-07-28 Oscillation generation system

Publications (1)

Publication Number Publication Date
US2263248A true US2263248A (en) 1941-11-18

Family

ID=23101029

Family Applications (1)

Application Number Title Priority Date Filing Date
US286996A Expired - Lifetime US2263248A (en) 1939-07-28 1939-07-28 Oscillation generation system

Country Status (4)

Country Link
US (1) US2263248A (de)
CH (1) CH220365A (de)
DE (1) DE735968C (de)
GB (1) GB542970A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435804A (en) * 1944-01-01 1948-02-10 Rca Corp Cavity resonator magnetron device
US2435609A (en) * 1943-04-20 1948-02-10 Bell Telephone Labor Inc Dipole antenna
US2454094A (en) * 1944-01-21 1948-11-16 Scophony Corp Of America Electron discharge device for producing electric oscillations
US2602893A (en) * 1942-03-31 1952-07-08 Sperry Corp Wave guide antenna

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976519C (de) * 1941-03-25 1963-10-17 Siemens Ag Klystron
DE973175C (de) * 1949-02-20 1960-01-07 Siemens Ag Wanderfeldroehre mit Antenne

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602893A (en) * 1942-03-31 1952-07-08 Sperry Corp Wave guide antenna
US2435609A (en) * 1943-04-20 1948-02-10 Bell Telephone Labor Inc Dipole antenna
US2435804A (en) * 1944-01-01 1948-02-10 Rca Corp Cavity resonator magnetron device
US2454094A (en) * 1944-01-21 1948-11-16 Scophony Corp Of America Electron discharge device for producing electric oscillations

Also Published As

Publication number Publication date
GB542970A (en) 1942-02-04
CH220365A (de) 1942-03-31
DE735968C (de) 1943-06-03

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