US2573517A - Ultrahigh-frequency circuit arrangement comprising a discharge tube - Google Patents

Ultrahigh-frequency circuit arrangement comprising a discharge tube Download PDF

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Publication number
US2573517A
US2573517A US680932A US68093246A US2573517A US 2573517 A US2573517 A US 2573517A US 680932 A US680932 A US 680932A US 68093246 A US68093246 A US 68093246A US 2573517 A US2573517 A US 2573517A
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United States
Prior art keywords
frequency
tubes
impedance
conductors
condensers
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Expired - Lifetime
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US680932A
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English (en)
Inventor
Adelbert Van Weel
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
    • H03B5/1817—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator
    • H03B5/1835—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator the active element in the amplifier being a 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
    • H03F1/12—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of attenuating means
    • H03F1/13—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of attenuating means in discharge-tube amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices

Definitions

  • the invention relates to an ultrahigh-frequency circuit arrangement comprising a dissupply voltage is supplied to an electrode through the intermediary of a conductor which is located in proximity of a second conductor, which is traversed by a highfrequency current, wherein the two conductors areconnected to one another at the end located close to the electrode via a condenser of low pedance for voltages of highand ultrahigh-frequency and form in electrical respect a unit exclusively for voltages of such frequencies.
  • the two conductors are connected to the two spectively of a directly heated cathode which has a high-frequency alternating voltage with respect to earth.
  • the object of the present invention is to eliminate these losses.
  • this object is attained by closing the transmission line formed by these two conductors at the end remote from the electrode via a separating condenser by means of a resistance whose value approximately corresponds to the surge impedance of the line.
  • The-invention- is based on the recognition that the impedance of the transmission line formed by the two conductors may have such an inductive value that the circuit formed by this inductive impedance and the condenser which connects the conductors to the end close to the electrode is tuned to a frequency located in the frequency range utilized. Instead of the very low capacitative impedance of the said condenser, there occurs in this way for this frequency between the said ends an ohmic impedance which may give rise to losses.
  • the impedance at the other end is always an ohmic impedance, so that the resonance with the condenser is excluded.
  • Fig. 1 is a schematic diagram of a first embodiment of a high-frequency oscillator incorporating the invention.
  • Fig. 2 is a schematic diagram of a second embodiment of a high-frequency oscillator incorporating the invention.
  • the circuit-arrangement shown in Fig. 1 serves current supply terminals reto generate high-frequency oscillations and comprises two tubes I and 3, which are connected'in push-pull and which comprise directly heated cathodes; the grids of these tubes are connected to one-another and, via a leak-age resistance 4, to earth. Between the anodes of the two tubes is connected an oscillatory circuit 5 tuned to the frequency to be generated, whilst for the oscillations to be generated the cathodes are each connected to a point of a capacitative potentiometer located in parallel to the circuit and formed by the capacities of the tubes.
  • a lecher wire system is connected between the oathodes of the tubes I and 3, which cathodes have a high-frequency voltage with respect to earth.
  • This system consists of two lecher wires 1 whose ends which are not connected to the cathodes are interconnected and earthed.
  • the lecher Wire system 1, 1 may be tuned by means of a slidable short-circuiting bridge 8.
  • the lecher wires 1 traversed by high-frequency current are made hollow and each of them encloses a wire-shaped conductor 9 which is insulated from the wire. These conductors are respectively connected to that current supply terminal of a cathode which is not connected to a lecher-wire. Betweenthe ends of the conductors 'l and 9 which are remote from the cathode is connected a source of heating current H, so that the required heating current is supplied to the cathodes via the conductors I and 9.
  • condensers I3 and I5 which have a low impedance for the oscillations to be generated, are connected between those ends of the conductors I and 9, respectively, which are connected to the same cathode.
  • the impedance of at least one of the two transmission lines formed by the conductors 'I and 9 has such an inductive value that the parallel resonance circuit formed by this inductive impedance and the condenser l3 or I5 is tuned to the frequency of the oscillations to be generated, owing to which, instead of the very low capacitative impedance of the condenser l3 or 15 there occurs for the said frequency between the current supply terminals of the cathode of the tube I or 3 an ohmic impedance which gives rise to losses since a high-frequency voltage which may occur between those ends of the conductors 'l' and 9 which are connected to a cathode causes a highfrequency current through the ohmic impedance present between these ends, which causes losses.
  • these losses are avoided by closing the the twin conductor lines formed by the conductors 1 and 9 at the end remote from the cathode via separating condensers I1 and I9 respectively by means of resistances 2I and 23 respectively, whose values substantially correspond to the surge impedance of the line, the impedance of the line at the end close to the cathode being in this case always an ohmic impedance, so that resonance with the condensers I3 and I5 respectively is excluded.
  • Fig. 2 represents a form of construction of av circuit-arrangement accjirding to the invention, which also serves for the generation of oscillations.
  • a lecher-wire system tuned to the frequency of the oscillations to be generated and consisting of conductors 21 and a short-circuiting bridge 28 is connected between the anodes of the tubes I and 3; whilst the grids of the tubes I and 3 are connected, via condensers 29 and EH respectively of low impedance for the oscillations to be generated, to the anodes of the tubes 3 and I respectively.
  • the cathodes of the tubes I and 3 are connected to one another and earthed.
  • the direct-current voltage required for the anodes of the tubes is supplied by a source of voltage 33 which is connected on the one hand to the lecher-wires 21 and, on the other hand, to earth.
  • a bias voltage which is negative with respect to earth is supplied to the grids of .the tubes I and 3 by conductors 35 which are enclosed by the lecher-wires 21, which are traversed by high-frequency current, and which are connected to a source of bias voltage 31.
  • the two transmission' lines formed by the two conductors 21 and 35 are closed at the end remote from the tubes I and 3 via separating condensers I7 and I9 respectively by means of resistances 2
  • a high frequency device comprising a pair of electron discharge tubes each having a directly heated cathode, a grid and an anode, the grids of said tubes being interconnected, a parallelresonant circuit connected between the anodes of said tubes, a source of cathode voltage for said tubes, a pair of coaxial transmission lines each connected between said source and a respective cathode of said tubes, said lines being juxtaposed in parallel relation,'a' first .pair of condensers having a low impedance for high frequencies, each of said first condensers being shunted across the cathode end of one of said lines, a second pair of condensers having a low impedance for high frequencies, a pair of resistances each connected in series with one of said second condensers across the other end of one of said lines, said resistances having an ohmic value an intermediate point in said source, a first pair of condensers having a low impedance for high frequencies, each of said first condensers being
  • a high-frequency circuit comprising a pair of electron discharge tubes having an electronemissive electrode, a grid electrode and an anode electrode and terminals for said electrodes, a
  • each coaxial conductor including an outer lead and an inner lead, the outer leads of said conductors being connected to one pair of corresponding electrode terminals in said tubes, the inner leads of said conductors being connected to another pair of corresponding terminals in said tubes, means to apply an operating potential through said outer leads to the electrodes connected thereto, a first pair of condensers presenting a low impedance to high-frequencies, each of said first condensers being shunted across the leads at the terminal end of a respective coaxial conductor, a second pair of condensers having a low impedance to high-frequencies, and a pair of resistances each connected in series with one of said second condensers across the leads at the other end of a respective coaxial conductor, said resistances having an ohmic value substantially equal to the surge impedance of said coaxial conductors.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Tubes (AREA)
  • Amplifiers (AREA)
US680932A 1943-03-29 1946-07-02 Ultrahigh-frequency circuit arrangement comprising a discharge tube Expired - Lifetime US2573517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL619149X 1943-03-29

Publications (1)

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US2573517A true US2573517A (en) 1951-10-30

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US (1) US2573517A (en(2012))
FR (1) FR903045A (en(2012))
GB (1) GB619149A (en(2012))
NL (1) NL65134C (en(2012))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735015A (en) * 1956-02-14 Separator
US2771548A (en) * 1952-07-08 1956-11-20 Polytechnic Res & Dev Co Inc Receiver tunable over v. h. f. and u. h. f. television bands
US5180949A (en) * 1990-04-06 1993-01-19 U.S. Philips Corp. Plasma generator
US6342820B1 (en) * 1999-06-16 2002-01-29 U.S. Philips Corporation Balanced oscillator having a short circuited quarter-wave paired line

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2336555A (en) * 1942-03-03 1943-12-14 Hazeltine Corp High-frequency signal-translating system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2336555A (en) * 1942-03-03 1943-12-14 Hazeltine Corp High-frequency signal-translating system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735015A (en) * 1956-02-14 Separator
US2771548A (en) * 1952-07-08 1956-11-20 Polytechnic Res & Dev Co Inc Receiver tunable over v. h. f. and u. h. f. television bands
US5180949A (en) * 1990-04-06 1993-01-19 U.S. Philips Corp. Plasma generator
US6342820B1 (en) * 1999-06-16 2002-01-29 U.S. Philips Corporation Balanced oscillator having a short circuited quarter-wave paired line

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Publication number Publication date
GB619149A (en) 1949-03-04
NL65134C (en(2012))
FR903045A (fr) 1945-09-21

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