US2293151A - Resonant cavity device - Google Patents

Resonant cavity device Download PDF

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Publication number
US2293151A
US2293151A US360310A US36031040A US2293151A US 2293151 A US2293151 A US 2293151A US 360310 A US360310 A US 360310A US 36031040 A US36031040 A US 36031040A US 2293151 A US2293151 A US 2293151A
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cavity
electrons
collecting electrode
ultra high
high frequency
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US360310A
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Ernest G Linder
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RCA Corp
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RCA Corp
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Priority to GB12963/41A priority patent/GB548614A/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
    • H01J25/22—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

  • This invention relates to ultra high frequency devices, and more particularly to an ultra high frequency resonant cavity device for generating, detecting or converting oscillations into currents of low frequency.
  • ultra high frequency oscillations is generally applied to electromagnetic oscillations having a frequency of the order of 500 megacycles per second and upward. At the higher frequencies, for example, 3000 megacycles, it has been dimcult to generate powerful oscillations and equally dimcult to detect eiciently. This dimculty has been mainly due to the space characteristics of the thermionic tubes which are employed.
  • the magnetron and Barkhausen-Kurz tubes are the magnetron and Barkhausen-Kurz tubes.
  • the radio frequency potentials are applied to the electrodes by means of resonant circuits.
  • Figure 1 is a schematic diagram of one embodiment of the invention
  • Figure 2 is a schematic dlagram' employed in describing the operation oi the device.
  • the elements of the thermionic device are suitably supported within an evacuated envelope I. These elements are: a cathode 3, cylindrical focusing elements 5, 1, phasing electrodes 9, Il, a collecting electrode I3 and a hollow resonant cavity I2 including apertures I5 which are preferably coaxlally mounted between the phasing electrodes 9 and Il.
  • a dipole antenna Il may beconnected to a transmission line IS which includes a loop 2
  • the y resonant cavity I2 is preferably but not necessarily of toroidal form so dimensioned that an electromagnetic field of the proper frequency will resonate the cavity and -will establish therein oscillations.
  • the frequency, at which resonant oscillations occur, is determined primarily by the dimensions of the cavity. 'I'he cavity is preferably bounded by a suitable conductor which includes one or more apertures through which electrons are directed.
  • a Helmholtz resonator for sound waves corresponds to the instant resonant cavity for electromagnetic waves. If the device is to be use d to convert the ultra high frequency energy by means of a-beating oscillator, the currents of the beating frequency may be induced within thel cavity I2 by loop 23 terminating a transmission line 25 connected t0 a beating oscillator 2l.
  • the cathode, f ocusingand phasing electrodes, and resonant cavity are suitably biased by connections to a potentiomer 29 which is connected across a power source 3l.
  • the collecting electrode I 3 is connected to an am'plier or signal indicating device by a blocking capacitor 33.
  • the collecting electrode I3 may be biased slightly positive or slightly negative by means of the potentiometer 35 and battery 31.
  • an electron beam is established by the cathode 3 and focusing electrodes 5, l.
  • the first phasing electrode 9 may also focus the beam.
  • This beam is projected through the resonant cavity I2 in which the ultra high fre- A'quency iield imparts velocity variation to the beam.
  • Some of the higher velocity electrons pass through the cavity and reach the collecting are reversed and returned to the cavity, again passing through it. 'I'he phase of the returning electron groups is adjusted by proper. electrode spacing and potential so as to establish oscillations within the cavity, or to increase the amplitude of the oscillations, if oscillations have been established within the cavity.
  • the waves to be detected are impressed upon the dipole antenna il and hence induced within the cavity, where they.v form resonant waves which are reinforced or increased by the regenerative action of the velocity modulated electron beam. If the device is used as an oscillator for the production of power at ultra high frequencies, the power is derived by the currents induced in the loop 2l.
  • V AV MeanV This series/is explainable on the basis of transit time from the resonator center to the plate and return. This time I is given by:
  • the invention has been described as an ultra high frequency resonant cavity device in which oscillations may be generated or detected. Furthermore, the detection may 'be of a regenerative character which increases the eciency of detection about 10 times.
  • An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity positioned between said source and said electrode, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to the cavity the said passing electrons and for adjusting the phase of electrons returning through said cavity so that the returning electrons establish ultra high frev quency Waves within the cavity.
  • An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity located between said source and said electrode, means for establishing ultra high frequency waves within said cavity, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to the cavity the said passing electrons and for adjusting the phase of electrons returning through said cavity so that the returning electrons increase the amplitude of the ultra high frequency waves established within the cavity.
  • An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity located in operable relation between said source and said electrode, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, a hollow electrode disposed beresonant cavity operably located between saidv source and said electrode, means for establishing ultra high frequency waves within said cavity, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to thecavity the said passing electrons v and for adjusting the phase of electrons returning through said cavity so that the returning electrons increase the amplitude of the ultra high frequency waves established within the cavity, and means including' said collecting electrode for deriving currents corresponding to said waves.
  • An ultra high frequency device including a source of electrons, a collecting electrode,l a resonant cavity in operable relation between said source and said electrode, means for establish- .tween said cavity and collecting electrode elecing within said cavity ultra high frequency waves to be detected, means for applying beating oscillations to said cavity,.means for directing electrons from said source through said cavity and toward'said collecting electrode, means for adiusting the phase of the electrons passing through said 'cavity so that velocity variations are established, a hollow electrode disposed between said cavity and collecting lelectrode electrically biased independently of said cavity and said collecting electrode ⁇ for returning to -said cavity said passing electrons and for adjusting the phase of electrons returning through said cavity, and means including said collecting electrode for deriving currents having al frequency corresponding to the beat frequency of the ultra high frequency waves and beating oscillations,
  • An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity operably located between said source and said electrode, .means for directing electrons from said source through said cavity and toward said collecting-electrode, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independ- 'ently of said cavity and said collecting electrode for returning to said cavity said electrons directed through the cavity and for adjusting the Y phase of electrons returning through said cavity so that the returning electrons increase the ultra high frequency waves established within the cavity by electrons passing therethrough.
  • An ultra high frequency device including a.
  • a source of electrons a collecting electrode, a resonant cavity operably located between said source and said electrode, means for establishing ultra high frequency waves within said cavity,
  • Anultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity positioned between said source and said electrode, means for directing electrons from vsaid source through said cavity and toward said collecting electrode, a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to said cavity the electrons directed therethrough' and for adjusting the phase of electrons' returning through said cavity so that the returning electrons increase the amplitude of the ultra high frequency waves established within the cavity by electrons passing therethrough,- and means including said collecting electrode for deriving currents corresponding to said waves.
  • An ultra high -frequency device including a source oi electrons, a collecting electrode, a
  • resonant cavity positioned between said sourcel and said electrode, means for establishing ultra high frequency waves within said cavity, means for directing electrons from said source through said cavity and toward said collecting electrode, a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to said cavity the electrons directed therethrough and for adjusting the phase of electrons returning through said cavity so that the returning electrons increase the ultra high frequency waves established within the cavity, and means including said collecting electrode for deriving currents corresponding to said waves.

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  • Particle Accelerators (AREA)

Description

E. G. UNDER RESONANT CAVITY DEVICE Aug. 18, i942. n2,29351 Filed Oct. 8, 1940 @ITM *25 \7 BEHWNG v osc/LL/WOH Snnentor nder Patented Aug. 18, 1942 UNI' BESONANT CAVITY DEVICE Ernest G. Linder, Philadelphia, Pa., assignor to Radio Corporation of America, a corporation of Delaware Application October 8, 1940. Serial No. 360,310
9 Claims.
This invention relates to ultra high frequency devices, and more particularly to an ultra high frequency resonant cavity device for generating, detecting or converting oscillations into currents of low frequency.
The term "ultra high frequency oscillations is generally applied to electromagnetic oscillations having a frequency of the order of 500 megacycles per second and upward. At the higher frequencies, for example, 3000 megacycles, it has been dimcult to generate powerful oscillations and equally dimcult to detect eiciently. This dimculty has been mainly due to the space characteristics of the thermionic tubes which are employed.
Among the prior art devices are the magnetron and Barkhausen-Kurz tubes. In these tubes, the radio frequency potentials are applied to the electrodes by means of resonant circuits.
The diiculties of generating or detecting radio frequency oscillations, of a wave length of the order of 10 centimeters, will be appreciated by considering the physical size of a magnetron oscillator in which the anode is a cylinder of the order of 2 millimeters radius and 1 centimeter length. In this arrangement, the anode is subjected to intense heat when even low power oscillations are generated. Thus it is quite apparent that the space limitations of the prior art oscillators have prevented the generation of more than about 10 watts of ultra high frequency oscillatory energy. Furthermore, devices of the aforementioned type are inemcient detectors.
(Cl. 25o-20) connected by resonant circuits and which do not themselves oscillate, but which direct electrons through a resonant cavity. In other words, the radio frequency potentials will not be applied to the tube elements and thus some of the restrictions on size 'will be eliminated. As an object of this invention, means will be provided for utilizing a resonant cavity to generate, detect or convert oscillations of a predetermined frequency. It is another object of the invention to provide a resonant cavity having a size corresponding to a predetermined band of wave lengths. It is a further object of the invention to provide means for collecting or inducing electromotive forces within a resonant cavity. A still further object is to provide means for detecting and regenerating ultra high frequency oscillations.
The invention will be described by referring to the accompanying drawing in which Figure 1 is a schematic diagram of one embodiment of the invention; and Figure 2 is a schematic dlagram' employed in describing the operation oi the device. I
Referring to Fig. 1, the elements of the thermionic device are suitably supported within an evacuated envelope I. These elements are: a cathode 3, cylindrical focusing elements 5, 1, phasing electrodes 9, Il, a collecting electrode I3 and a hollow resonant cavity I2 including apertures I5 which are preferably coaxlally mounted between the phasing electrodes 9 and Il. A dipole antenna Il may beconnected to a transmission line IS which includes a loop 2| arranged within the the cavity I2 for inducing or collecting ultra high frequency energy. The y resonant cavity I2 is preferably but not necessarily of toroidal form so dimensioned that an electromagnetic field of the proper frequency will resonate the cavity and -will establish therein oscillations. The frequency, at which resonant oscillations occur, is determined primarily by the dimensions of the cavity. 'I'he cavity is preferably bounded by a suitable conductor which includes one or more apertures through which electrons are directed. By way of an analogue, a Helmholtz resonator for sound waves corresponds to the instant resonant cavity for electromagnetic waves. If the device is to be use d to convert the ultra high frequency energy by means of a-beating oscillator, the currents of the beating frequency may be induced within thel cavity I2 by loop 23 terminating a transmission line 25 connected t0 a beating oscillator 2l. The cathode, f ocusingand phasing electrodes, and resonant cavity are suitably biased by connections to a potentiomer 29 which is connected across a power source 3l. The collecting electrode I 3 is connected to an am'plier or signal indicating device by a blocking capacitor 33. The collecting electrode I3 may be biased slightly positive or slightly negative by means of the potentiometer 35 and battery 31.
In the operation of the device, an electron beam is established by the cathode 3 and focusing electrodes 5, l. It should be understood that the first phasing electrode 9 may also focus the beam. This beam is projected through the resonant cavity I2 in which the ultra high fre- A'quency iield imparts velocity variation to the beam. Some of the higher velocity electrons pass through the cavity and reach the collecting are reversed and returned to the cavity, again passing through it. 'I'he phase of the returning electron groups is adjusted by proper. electrode spacing and potential so as to establish oscillations within the cavity, or to increase the amplitude of the oscillations, if oscillations have been established within the cavity.
If the device is` being used as a detector, the waves to be detected are impressed upon the dipole antenna il and hence induced within the cavity, where they.v form resonant waves which are reinforced or increased by the regenerative action of the velocity modulated electron beam. If the device is used as an oscillator for the production of power at ultra high frequencies, the power is derived by the currents induced in the loop 2l.
By way of example, the following table ci resonator voltages was found to give the detection maxima:
V AV MeanV This series/is explainable on the basis of transit time from the resonator center to the plate and return. This time I is given by:
This 3/2 power law is followed by the above data.
Putting V=1000, AV=170, S=2.4, we get AT=2.17 -10, experimental value is 31610-10. Also These results indicate that transit times of an `integral number of periods give maximum sensi- Hence, if the spacing through the cavity is made twice that from the cavity to the cathode and/or anode, then, when the transit time through the cavity is one-half period, the transit time from cavity to A or to C and back to the cavity will be one period.
Thus, the invention has been described as an ultra high frequency resonant cavity device in which oscillations may be generated or detected. Furthermore, the detection may 'be of a regenerative character which increases the eciency of detection about 10 times.
It should be understood that the invention is not limited tothe precise arrangement or spacing of the elements shown.
I claim as my invention:
l. An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity positioned between said source and said electrode, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to the cavity the said passing electrons and for adjusting the phase of electrons returning through said cavity so that the returning electrons establish ultra high frev quency Waves within the cavity.
2. An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity located between said source and said electrode, means for establishing ultra high frequency waves within said cavity, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to the cavity the said passing electrons and for adjusting the phase of electrons returning through said cavity so that the returning electrons increase the amplitude of the ultra high frequency waves established within the cavity.
3. An ultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity located in operable relation between said source and said electrode, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, a hollow electrode disposed beresonant cavity operably located between saidv source and said electrode, means for establishing ultra high frequency waves within said cavity, means for directing electrons from said source through said cavity and toward said collecting electrode, means for adjusting the phase of the electrons passing through said cavity so that velocity variations are established, a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to thecavity the said passing electrons v and for adjusting the phase of electrons returning through said cavity so that the returning electrons increase the amplitude of the ultra high frequency waves established within the cavity, and means including' said collecting electrode for deriving currents corresponding to said waves.
5.. An ultra high frequency device. including a source of electrons, a collecting electrode,l a resonant cavity in operable relation between said source and said electrode, means for establish- .tween said cavity and collecting electrode elecing within said cavity ultra high frequency waves to be detected, means for applying beating oscillations to said cavity,.means for directing electrons from said source through said cavity and toward'said collecting electrode, means for adiusting the phase of the electrons passing through said 'cavity so that velocity variations are established, a hollow electrode disposed between said cavity and collecting lelectrode electrically biased independently of said cavity and said collecting electrode `for returning to -said cavity said passing electrons and for adjusting the phase of electrons returning through said cavity, and means including said collecting electrode for deriving currents having al frequency corresponding to the beat frequency of the ultra high frequency waves and beating oscillations,
6. An ultra high frequency device vincluding a source of electrons, a collecting electrode, a resonant cavity operably located between said source and said electrode, .means for directing electrons from said source through said cavity and toward said collecting-electrode, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independ- 'ently of said cavity and said collecting electrode for returning to said cavity said electrons directed through the cavity and for adjusting the Y phase of electrons returning through said cavity so that the returning electrons increase the ultra high frequency waves established within the cavity by electrons passing therethrough.
7. An ultra high frequency device including a.
source of electrons, a collecting electrode, a resonant cavity operably located between said source and said electrode, means for establishing ultra high frequency waves within said cavity,
means for directing electrons from said source through said cavity and toward, said collecting electrode, and a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and f said collecting electrode for returning to said cavity said electrons directed throughthe cavity and for adjusting the phase of electrons returning through said cavity so that the `returning electrons increase the ultra high frequency waves established within the cavity.
8. Anultra high frequency device including a source of electrons, a collecting electrode, a resonant cavity positioned between said source and said electrode, means for directing electrons from vsaid source through said cavity and toward said collecting electrode, a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to said cavity the electrons directed therethrough' and for adjusting the phase of electrons' returning through said cavity so that the returning electrons increase the amplitude of the ultra high frequency waves established within the cavity by electrons passing therethrough,- and means including said collecting electrode for deriving currents corresponding to said waves.
9. An ultra high -frequency device including a source oi electrons, a collecting electrode, a
resonant cavity positioned between said sourcel and said electrode, means for establishing ultra high frequency waves within said cavity, means for directing electrons from said source through said cavity and toward said collecting electrode, a hollow electrode disposed between said cavity and collecting electrode electrically biased independently of said cavity and said collecting electrode for returning to said cavity the electrons directed therethrough and for adjusting the phase of electrons returning through said cavity so that the returning electrons increase the ultra high frequency waves established within the cavity, and means including said collecting electrode for deriving currents corresponding to said waves.
ERNEST G,.I`.INDER.
US360310A 1940-10-08 1940-10-08 Resonant cavity device Expired - Lifetime US2293151A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416714A (en) * 1943-02-22 1947-03-04 Bell Telephone Labor Inc Electron discharge device
US2417551A (en) * 1941-01-17 1947-03-18 Emi Ltd Electron discharge device and associated circuit
US2418518A (en) * 1943-03-20 1947-04-08 Gen Electric Ultra high frequency converter of the space-resonant type
US2421273A (en) * 1943-02-25 1947-05-27 Gen Electric Ultra high frequency electric discharge device
US2433386A (en) * 1941-09-26 1947-12-30 Standard Telephones Cables Ltd Ultra high frequency mixer circuit
US2436397A (en) * 1942-08-08 1948-02-24 Bell Telephone Labor Inc Ultra high frequency oscillator
US2445404A (en) * 1941-08-08 1948-07-20 Emi Ltd Electron discharge device and associated circuit
US2445771A (en) * 1941-12-12 1948-07-27 Standard Telephones Cables Ltd Electron discharge device of the velocity modulation type
US2450026A (en) * 1941-08-29 1948-09-28 Standard Telephones Cables Ltd Thermionic device for use with wave guides
US2458167A (en) * 1944-04-27 1949-01-04 Machlett Lab Inc Electrical discharge device having cavity resonators
US2461306A (en) * 1943-05-31 1949-02-08 Rauland Corp Oscillator-amplifier radio circuits
US2470802A (en) * 1943-08-10 1949-05-24 Rca Corp Microwave device
US2476885A (en) * 1943-07-28 1949-07-19 Westinghouse Electric Corp Mixer for microwave receivers
US2487800A (en) * 1943-01-22 1949-11-15 Sperry Corp Frequency multiplier and stabilization cavity resonator apparatus
US2489156A (en) * 1943-03-09 1949-11-22 Westinghouse Electric Corp Oscillation generator of the reflex type
US2489298A (en) * 1946-11-16 1949-11-29 Gen Electric Velocity modulation electron discharge device
US2516887A (en) * 1943-10-30 1950-08-01 Int Standard Electric Corp Ultra high frequency radio receiver
US2520182A (en) * 1940-12-24 1950-08-29 Int Standard Electric Corp Electron discharge apparatus
US2524179A (en) * 1944-04-13 1950-10-03 Edwin G Schneider Tuned ultra high frequency thermionic detector
US2538669A (en) * 1940-12-02 1951-01-16 Hartford Nat Bank & Trust Co Electron tube system of the velocity modulation type
US2571676A (en) * 1941-05-21 1951-10-16 Emi Ltd Circuit arrangement embodying electron discharge device employing hollow resonator
US2581408A (en) * 1947-04-16 1952-01-08 Sperry Corp High-frequency electron discharge device
US2593443A (en) * 1942-01-29 1952-04-22 Sperry Corp High-frequency tube structure
US2602137A (en) * 1941-10-23 1952-07-01 Sperry Corp High-frequency converter apparatus
US2616038A (en) * 1947-09-23 1952-10-28 Univ Leland Stanford Junior Frequency converter
US2629821A (en) * 1945-06-07 1953-02-24 La Verne R Philpott High-frequency signal translation circuit
US2632115A (en) * 1947-06-21 1953-03-17 Csf Focusing device for electron microscopes
US2777967A (en) * 1946-04-18 1957-01-15 George H Vineyard High frequency oscillator
US2800603A (en) * 1952-04-08 1957-07-23 Itt Traveling wave electron discharge devices
US2804545A (en) * 1945-10-11 1957-08-27 Jr John F Clark Superregenerative radio receiver
US2853646A (en) * 1954-06-07 1958-09-23 Jr Wilson S Geisler Electron discharge device
US3061791A (en) * 1956-11-23 1962-10-30 Gen Precision Inc Microwave detector

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538669A (en) * 1940-12-02 1951-01-16 Hartford Nat Bank & Trust Co Electron tube system of the velocity modulation type
US2520182A (en) * 1940-12-24 1950-08-29 Int Standard Electric Corp Electron discharge apparatus
US2417551A (en) * 1941-01-17 1947-03-18 Emi Ltd Electron discharge device and associated circuit
US2571676A (en) * 1941-05-21 1951-10-16 Emi Ltd Circuit arrangement embodying electron discharge device employing hollow resonator
US2445404A (en) * 1941-08-08 1948-07-20 Emi Ltd Electron discharge device and associated circuit
US2450026A (en) * 1941-08-29 1948-09-28 Standard Telephones Cables Ltd Thermionic device for use with wave guides
US2433386A (en) * 1941-09-26 1947-12-30 Standard Telephones Cables Ltd Ultra high frequency mixer circuit
US2602137A (en) * 1941-10-23 1952-07-01 Sperry Corp High-frequency converter apparatus
US2445771A (en) * 1941-12-12 1948-07-27 Standard Telephones Cables Ltd Electron discharge device of the velocity modulation type
US2593443A (en) * 1942-01-29 1952-04-22 Sperry Corp High-frequency tube structure
US2436397A (en) * 1942-08-08 1948-02-24 Bell Telephone Labor Inc Ultra high frequency oscillator
US2487800A (en) * 1943-01-22 1949-11-15 Sperry Corp Frequency multiplier and stabilization cavity resonator apparatus
US2416714A (en) * 1943-02-22 1947-03-04 Bell Telephone Labor Inc Electron discharge device
US2421273A (en) * 1943-02-25 1947-05-27 Gen Electric Ultra high frequency electric discharge device
US2489156A (en) * 1943-03-09 1949-11-22 Westinghouse Electric Corp Oscillation generator of the reflex type
US2418518A (en) * 1943-03-20 1947-04-08 Gen Electric Ultra high frequency converter of the space-resonant type
US2461306A (en) * 1943-05-31 1949-02-08 Rauland Corp Oscillator-amplifier radio circuits
US2476885A (en) * 1943-07-28 1949-07-19 Westinghouse Electric Corp Mixer for microwave receivers
US2470802A (en) * 1943-08-10 1949-05-24 Rca Corp Microwave device
US2516887A (en) * 1943-10-30 1950-08-01 Int Standard Electric Corp Ultra high frequency radio receiver
US2524179A (en) * 1944-04-13 1950-10-03 Edwin G Schneider Tuned ultra high frequency thermionic detector
US2458167A (en) * 1944-04-27 1949-01-04 Machlett Lab Inc Electrical discharge device having cavity resonators
US2629821A (en) * 1945-06-07 1953-02-24 La Verne R Philpott High-frequency signal translation circuit
US2804545A (en) * 1945-10-11 1957-08-27 Jr John F Clark Superregenerative radio receiver
US2777967A (en) * 1946-04-18 1957-01-15 George H Vineyard High frequency oscillator
US2489298A (en) * 1946-11-16 1949-11-29 Gen Electric Velocity modulation electron discharge device
US2581408A (en) * 1947-04-16 1952-01-08 Sperry Corp High-frequency electron discharge device
US2632115A (en) * 1947-06-21 1953-03-17 Csf Focusing device for electron microscopes
US2616038A (en) * 1947-09-23 1952-10-28 Univ Leland Stanford Junior Frequency converter
US2800603A (en) * 1952-04-08 1957-07-23 Itt Traveling wave electron discharge devices
US2853646A (en) * 1954-06-07 1958-09-23 Jr Wilson S Geisler Electron discharge device
US3061791A (en) * 1956-11-23 1962-10-30 Gen Precision Inc Microwave detector

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