US2421043A - Detector of modulated carrier frequencies - Google Patents

Detector of modulated carrier frequencies Download PDF

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Publication number
US2421043A
US2421043A US457800A US45780042A US2421043A US 2421043 A US2421043 A US 2421043A US 457800 A US457800 A US 457800A US 45780042 A US45780042 A US 45780042A US 2421043 A US2421043 A US 2421043A
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US
United States
Prior art keywords
electrode
frequency
resonator
collector
grid
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
US457800A
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English (en)
Inventor
Tomlin Stanley Gordon
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
    • H01Q3/32—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by mechanical means
    • 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
    • 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
    • H01J25/08—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 with electron stream perpendicular to the axis of the resonator

Definitions

  • the invention resides in a re ⁇ -ceiver for electromagnetic waves of very high frequency comprising a valve including an electrode system for setting up an electron beam, a collector electrode and a grid electrode in the path of the beam, means for maintaining the electrodes at such potentials that the operating con- .dition of the valve is at a curved part of the gridvoltage collector-current characteristic, and means for ⁇ velocity modulating electrons approaching the grid electrode in accordance with the incoming modulated high frequency wave.
  • a receiver for electromagnetic waves of very high frequency comprising a valve including an electrode system for setting up an electron beam, a collector electrode, means for maintaining the electrodes at such potentials that the' operating condition of the valve is at a curved part 'of the collector-current collector-voltage characteristic, vand means for velocity-modulating electrons appreaching the collector electrode in accordance with the incoming modulated high-frequency Waves.
  • the invention also resides in the method of detecting modulated waves of very high frequency comprising the velocity modulation in accordance with said waves of electrons in the cathode-grid space of a valve set to operate at a curved part of the mutual characteristic.
  • 'I'he invention further resides in the method of detecting modulated waves of very high frequency comprising the velocity modulation in accordance ⁇ with said vwaves of electrons in the cathode-collector electrode space of a valve set to operate at a curved part of the collector-current collector-voltage characteristic.
  • the invention resides in electron discharge apparatus comprising a length of co-axial lineconstituting a high-frequency resonator, an electrode system for directing an electron beam through diametric apertures inthe conductors of the co-axial line at a eld antinode, a collecting electrode in the beam path beyond the conductors of the co-axial line and a grid electrode interposed between the co-axial line and the collecting electrode.
  • such apparatus arranged for the dtection of modulated highfrequency waves, includes means for applying the modulated waves to the resonator, the rescnator having a natural frequency approximately equal to the carrier frequency, a low frequency output circuit connected to the collector electrode and means for applying to the grid electrode and the collector electrode such direct potentials that an operating'point on a curved part of the vgrid-voltage, collectorcurrent characteristic is reached.
  • the preferred method of reception is based upon the velocity modulation of a beam 0f electrons passing transversely through suitable apertures in a co-axial line resonator which is tuned to the frequency of the radiation to be received.
  • Fig. 1 is a substantially central, longitudinal
  • Fig. 2 is a diagrammatic cross sectional view through the upper end of the apparatus at substantially the center of the electron beam
  • Fig. 3 is a collector-current, grid-voltage curve of the apparatus of Figs. 1 and 2 which is to be used to explain the Invention,
  • the apparatus consists of some type of electron gun producing a parallel beam of electrons, a resonator which allows the beam to be velocity modulated, a control grid, and a final collecting electrode. This is shown schematically in Figs. ⁇ 1 and 2 of the accompanying drawings.
  • co-axial conductors I and 2 form a resonator of adjustable length.
  • a co-aXial line 3, 4 terminating in aloop 5 serves to feed incoming waves to the resonator.
  • Electrons.A from a cathode 6 are projected in a beam by focussing and accelerating electrodes l, 8 through apertures 9, I0 in the conductors I and 2.
  • Fins II are provided to reduce the gaps between the conductors at the apertures. The electrons are modulated in velocity in passing the gaps between the conductors and then pass into the field 0f a grid I2 beyond which is a collecting electrodeL I3.
  • the resonator may have an open end at the point where the beam passes through it, or it may be closed at both ends, and in that case the beam must pass through it at one-quarter of a wavelength from the end.
  • the gap between the inner and outer conductors at the apertures mustbe small so that thetransit time across the gap is small compared'with a period of the oscillation applied to the resonator.
  • the diameter of the inner rod is such that the transit time of electrons passing through this rod is an oddnumber is applied to the resonator, a curve Il. of the type. shown in Fig, 3 of the accompanying drawings,
  • the apparatus may also be used'ior the detection of modulated AWavesof very' high frequency if the grid f2 and the collecting electrode I3 are ponnected together or if the grid L2 is omit-ted.
  • v'I he apparatus -thenA consists essentially of an electrongun, means 'for Avelocit7 modulating the r ⁇ eletron ,beam end a ,single collecting electrode.
  • the ⁇ 'theory-Qt the triodejanode bend-'or square 'law detector shows that-the amplitude-of the i audio frequency output can .be increased bysuperposingonthe incoming ⁇ iiodulated carrier Wave, an .additional or'local carrier frequency Voltage ini-phase with it.
  • This kprocess has'i-'been ⁇ found 'd ifiidiilt torapplyin praticeovvingtqthe diiiculty Vo'fe'iecting exact synchronisation.
  • the grid or collector electrode and said resonator is such that for a given beam velocity the transit time of electrons reected from said grid or collector electrode in travelling from resonator to such electrode and back is an odd number of half 10 periods of the frequency of the incoming carrier waves whereby oscillations are produced in said resonator at the frequency of said carrier waves.

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US457800A 1940-06-28 1942-09-09 Detector of modulated carrier frequencies Expired - Lifetime US2421043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2421043X 1940-06-28

Publications (1)

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US2421043A true US2421043A (en) 1947-05-27

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US457800A Expired - Lifetime US2421043A (en) 1940-06-28 1942-09-09 Detector of modulated carrier frequencies

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US (1) US2421043A (enrdf_load_html_response)
BE (1) BE468572A (enrdf_load_html_response)
FR (1) FR930638A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831147A (en) * 1948-04-06 1958-04-15 Weber Joseph Electronic frequency analyzer device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2190511A (en) * 1938-03-01 1940-02-13 Gen Electric Ultra short wave system
US2220841A (en) * 1940-03-30 1940-11-05 Gen Electric High-frequency detector
US2225447A (en) * 1939-09-13 1940-12-17 Rca Corp Electron discharge device
US2293180A (en) * 1940-11-08 1942-08-18 Int Standard Electric Corp Detector system of the velocity modulation type
US2304186A (en) * 1939-12-14 1942-12-08 Int Standard Electric Corp Velocity modulated tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2190511A (en) * 1938-03-01 1940-02-13 Gen Electric Ultra short wave system
US2225447A (en) * 1939-09-13 1940-12-17 Rca Corp Electron discharge device
US2304186A (en) * 1939-12-14 1942-12-08 Int Standard Electric Corp Velocity modulated tube
US2220841A (en) * 1940-03-30 1940-11-05 Gen Electric High-frequency detector
US2293180A (en) * 1940-11-08 1942-08-18 Int Standard Electric Corp Detector system of the velocity modulation type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831147A (en) * 1948-04-06 1958-04-15 Weber Joseph Electronic frequency analyzer device

Also Published As

Publication number Publication date
FR930638A (fr) 1948-01-30
BE468572A (enrdf_load_html_response)

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