US2086335A - Ultrahigh frequency oscillator system - Google Patents

Ultrahigh frequency oscillator system Download PDF

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Publication number
US2086335A
US2086335A US741393A US74139334A US2086335A US 2086335 A US2086335 A US 2086335A US 741393 A US741393 A US 741393A US 74139334 A US74139334 A US 74139334A US 2086335 A US2086335 A US 2086335A
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United States
Prior art keywords
circuit
electrodes
oscillations
frequency oscillator
impedance
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Expired - Lifetime
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US741393A
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English (en)
Inventor
Posthumus Klaas
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RCA Corp
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RCA Corp
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Publication date
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Publication of US2086335A publication Critical patent/US2086335A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B9/00—Generation of oscillations using transit-time effects
    • H03B9/01—Generation of oscillations using transit-time effects using discharge tubes
    • H03B9/10—Generation of oscillations using transit-time effects using discharge tubes using a magnetron
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements

Definitions

  • This invention relates to an arrangement for producing high frequency and ultrahigh frequency electric oscillations and more particularly to a thermionic generator in which the circuit determining the frequency lies between two or more electrodes of a discharge tube.
  • a magnetron-oscillator comprising two or more anodes which are symmetrically arranged with respect to an incandescent cathode and in which an oscillatory circuit determining the frequency of the produced oscillations is provided between the anodes. Oscillations are produced in this circuit since a negative resistance is inserted be-- tween the electrodes. However, it is necessary, in this case, that the resistance of the circuit substantially corresponds to the negative resistance between the electrodes.
  • the resistance of the circuit be accommodated to the internal resistance. More particularly, when the frequencydetermining circuit of a magnetron-oscillator is constituted by an antenna-dipole, accommodation will be necessary, since the resistance of such an antenna is low and the negative resistance of a magnetron-oscillator is high.
  • the desired accommodation is ensured by connecting the frequency determining circuit to the electrode terminals through conductors, having such a length that the electric distance between the electrodes and the oscillatory circuit amounts to one-quarter wave length of the oscillations to be produced.
  • the frequency-determining circuit is connected to the conductors through condensers having such a size that the influence excited by the interelectrode capacity on the total external impedance is compensated.
  • 2 and Q denote a sectional View of the anodes of a magnetron oscillator.
  • the cathode of this oscillator which is perpendicular to the plane of the drawing, is denoted by K.
  • a field winding 26 may be used for the generation of oscillations.
  • the source of anodevoltage is connected to the anodes 2 and 4 over conductors 24, the length of each of which amounts to one-quarter wave length of the oscillations to be reproduced. That is to say, each of the conductors 24 together with a portion of the bridging conductor 25 to the midpoint thereof, has substantially a quarter wave length so that a nodal point is formed at the midpoint of the bridging conductor 25.
  • the oscillation circuit of the generator is constituted by both parts of a dipole antenna 6.
  • One arm of this antenna is connected through the condenser 16 and the conductors B and 20 to the electrode terminal 2.
  • the other antenna arm is connected through the condenser l8 and conductors iii and 22 to the electrode terminal 4.
  • the conductors 8 and II] have such a size that, together with the electrode supply wires 20 and 22, they have a length of one-quarterwave length of the oscillations produced by the generator. They thus achieve the required accommodation or matching of the impedance of the oscillatory circuit; in the case under review the accommodation of the impedance of antenna 6 to the negative resistance between the electrodes 2 and 4. In fact,
  • the impedance at the end of a line having a length of one-quarter wave length be 2
  • the impedance at the beginning of this line may be represented by where R is the wave resistance of the line.
  • a thermionic generator for producing high frequency and ultra-high frequency oscillations comprising an electron discharge tube having a pair of anodes symmetrically disposed about a cathode, an oscillatory circuitincluding two arms of a dipole antenna system, means including a pair of parallel conductors, each in series with a capacitor, interconnecting each anode respectively with one of said antenna arms for producing an impedance match between the portions of said circuit that lie within and outside of said tube respectively, and means including a source of direct current potential and circuit connections in series therewith interposed between said cathode and said anodes for supplying said discharge tube with the required polarization of its electrodes.
  • An electronic generator for producing high frequency and ultra-high frequency oscillations comprising an electron discharge tube having at least one pair of anodes symmetrically disposed about a cathode, an oscillatory circuit including two capacitors so dimensioned that the interelectrode capacity of the discharge tube is effectively compensated, two arms of a dipole antenna system each arm being coupled to said oscillatory circuit through one of said capacitors, respectively, and a pair of impedance matching conductors, each conductor extending between one of said anodes and one of said capacitors respectively and having an electrical length substantially equal to a quarter wave length of the waves generated, and means including a source of direct current potential and circuit connections in series therewith interposed between said cathode and the anode connectedterminals oi the discharge tube for supplying to said discharge tube the required polarization of its electrodes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US741393A 1933-09-06 1934-08-25 Ultrahigh frequency oscillator system Expired - Lifetime US2086335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2086335X 1933-09-06

Publications (1)

Publication Number Publication Date
US2086335A true US2086335A (en) 1937-07-06

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ID=19873632

Family Applications (1)

Application Number Title Priority Date Filing Date
US741393A Expired - Lifetime US2086335A (en) 1933-09-06 1934-08-25 Ultrahigh frequency oscillator system

Country Status (3)

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US (1) US2086335A (enrdf_load_stackoverflow)
BE (1) BE404742A (enrdf_load_stackoverflow)
NL (1) NL37611C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5180949A (en) * 1990-04-06 1993-01-19 U.S. Philips Corp. Plasma generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5180949A (en) * 1990-04-06 1993-01-19 U.S. Philips Corp. Plasma generator

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Publication number Publication date
NL37611C (enrdf_load_stackoverflow)
BE404742A (enrdf_load_stackoverflow)

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