US2471155A - Balanced variable reactance device - Google Patents

Balanced variable reactance device Download PDF

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Publication number
US2471155A
US2471155A US674971A US67497146A US2471155A US 2471155 A US2471155 A US 2471155A US 674971 A US674971 A US 674971A US 67497146 A US67497146 A US 67497146A US 2471155 A US2471155 A US 2471155A
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United States
Prior art keywords
plates
positionable
loop
capacitance
reactance
Prior art date
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Expired - Lifetime
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US674971A
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English (en)
Inventor
Robert V Langmuir
Jr Philip H Peters
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General Electric Co
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General Electric Co
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Publication date
Priority to BE475353D priority Critical patent/BE475353A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US674971A priority patent/US2471155A/en
Priority to GB4767/48A priority patent/GB637277A/en
Application granted granted Critical
Publication of US2471155A publication Critical patent/US2471155A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H5/00—One-port networks comprising only passive electrical elements as network components
    • H03H5/006—One-port networks comprising only passive electrical elements as network components comprising simultaneously tunable inductance and capacitance

Definitions

  • This invention relates to variable reactances for high frequency oscillating systems, and more particularly to a novel apparatus which permits simultaneous adjustment of both the inductance and capacitance of a system in such a manner that those parameters are always electrically balanced with respect to a fixed electrical reference point, such as a ground connection of zero voltage.
  • the inductance and capacitance are provided by juxtaposed parallel disks having sector-shaped cut-out portions leaving corresponding sectoral ring portions on the periphery of the disks.
  • the disks are interleaved on a common axis of rotation in such manner that relative rotation thereof effects an increase or decrease of the capacitance between the disks and a like simultaneous increase or decrease of the inductance formed by the peripheral ring portions.
  • a notable disadvantage of such arrangements lies in the fact that when they are employed as tuned circuits in which standing waves are set up the reactance presents no electrically neutral point which is fixed for all positions of the movable members, i. e., the point of zero high frequency voltage shifts about on the inductive portion as the movable member is operated. That disadvantage can be particularly inconvenient in certain types of electrical circuits, for example, those employing push-pull networks in which the various voltages and currents must be balanced against a common electrical reference point.
  • variable reactance having simultaneously adjustable inductive and capacitative components in which those components are electrically balanced with respect to a fixed electrical reference point for all values of reactance.
  • Fig. 1 represents a device embodying a variable reactance in accordance with the principles of the invention
  • Fig. 2 represents schematically an oscillating circuit in which the invention might find employment.
  • the invention is shown as comprising a plurality of fixed plates, I through 4, having rectangular cutout portions 5 and 6, such that the plates present a substantially C-shaped configuration as shown.
  • the configuration is bounded, as will be apparent from the drawing, by a loop comprising a vertical memher 1, horizontal arms 8 and 9, and extended fiat portions Ill and II of substantial area projecting toward each other but being separated by the gap formed by the rectangular cutout portions 6.
  • substantial area as applied to portions I0 and II and plates l2, l3 and I4 is meant an area sufiicient to provide whatever value of capacitance is desired for the device. The capacitance, and thus the area, will be determined by the particular inductive and capacitative range desired for the reactances.
  • the plates l2, l3 and I4 may be slidably mounted by any suitable means, such as by means of the insulating carrier members l5 which slide on a track IS on the base I! which may be of conductive material such as copper, and which may conductively interconnect plates I through 4.
  • the plates l2, l3 and M are spaced and supported in insulated relationship from plates I through 4 by means of the cross arm l8 which rests on carrier members 15.
  • any suitable means for moving the plates !2, l3 and M in reciprocating motion on the tracks l6 may be provided although for purposes of illustration there is shown a threaded driving rod l9 which threadedly engages screw 20 on one of the carrier members [5 and which is secured against longitudinal movement by flange or washer members 2i and 22 abutting against end plate 23.
  • the threaded rod I9 may be operated in reciprocating fashion either manually or by suitable power devices (not shown).
  • the plates I through i may be closed at their ends by means of conductive end plates 23 and 26 and top plate 2'! conductively connected to the plates I through 4 and forming an enclosure therefor.
  • a magnetron 28 which may be of the conventional split anode type.
  • Each of the anode leads 29 is connected to one of the portions Ill and II by preferably short connecting leads 29' which have a minimum of capacitance and inductance of their own.
  • the magnetron When properly energized, as hereinafter set forth in greater detail, the magnetron will oscillate with the described reactance as a tuned external circuit, the oscillating frequency of the magnetron being dependent upon the reactance value as determined by the position of the slidable plates 12, I3 and I4.
  • the inductance will be primarily determined by the area bounded by the movable plates I2, is and I4, vertical member "I and the arms 8 and 9. As the members 52, I3 and I l are moved to the lefthand end of the device that area will become progressively smaller. The eiiective inductance of the reactance is thereby decreased.
  • the capacitance of the device will be primarily determined by the capacitance between the slidable plates I2, 13 and M and the flat portions It? and II of the fixed plates I through t.
  • Fig. 2 in which corresponding portions of "Fig. 1 are similarly identified, there is shown as an'example of one use of the aforedescribed reactance, an oscillating circuit comprising the magnetron 3i, a variable reactance of the type heretofore described, and a suitable output circuit in the form of the parallel transmission line32 which'c'onducts energy from the oscillating circuit to any suitable external utilization'circuit (not shown).
  • the magnetron 31 may be of any of the conventional types such as the split anodetype.
  • the line 32 may comprise conductors 3B and 39, each connected respectively to the points 40 and A l on the inductive portion of the reactor. It will be understood that the points 40 and l! may be chosen at any suitable points on the inductance or the capacitance depending upon the voltage desired to be imposed 011 the line 32.
  • a variable reactance comprising a conductive 'pl'ate having a loop constituting an inductive portion and surfaces of substantial area on opposite "ends of said loop constituting a capacitative portion, said loop and said surfaces being symmetrically distributed with respect to a central transverse plane through said plate, a positionable niernbe'r of substantial 'area'having opposite halves symmetrically positioned on opposite sides of said transverse plane and juxtaposed in symmetrical relation to said loop and said surfaces, and means for moving said positionable member parallel to and in proximity tosaid-plat-e, whereby the :su'rface of said positionabl'e member may "be juxtaposed in varyin proportions to said loop and said surfaces.
  • a variable reactance comprising a conductive plate having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, a positionable member of substantial area juxtaposed to said plate in symmetrical relation with respect to said surfaces, said loop, said surfaces and said positionable member being symmetrically positioned with respect to a central transverse plane through said plate whereby electrical voltage and current relations in said plate are electrically balanced with respect to said transverse plane, and means for moving said positionable member parallel to and in proximity to said plate whereby the surface of said positionable member may be juxtaposed in varying pro-portions to said loop and said surfaces.
  • a variable reactance comprising a conductive plate having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, said loop and said surfaces being symmetrically distributed with respect to a central transverse plane through said plate, a po-; sitionable member of substantial area having opposite halves symmetrically positioned on opposite sides of said transverse plane and juxtaposed in symmetrical relation to said loop and said surfaces, and means for moving said positionable member parallel to and in proximity to said plate to juxtapose the surface of said positionable member in varying proportions to said loop and said surfaces whereby motion of said positionable member in one direction effectively decreases both the inductance and capacitance of said reactance simultaneously and motion in the other direction simultaneously increases both the inductance and capacitance of said reactance simultaneously.
  • a variable reactance comprising a substantially C-shaped conductive plate having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, said loop and said surfaces being symmetrically distributed with respect to a central transverse plane through said plate, a positionable member of substantial area having opposite halves symmetrically positioned on opposite sides of said transverse plane and juxtaposed in symmetrical re-l lation to said loop and said surfaces, and means for moving said positionable member parallel to and in proximity to said plate to juxtapose the surface of said positionable member to varying proportions of said 100p and said surfaces whereby motion of said positionable member in one direction effectively decreases both the inductance and capacitance of said reactance simultaneously and motion in the other direction simultaneously increases both the inductance and capacitance of said reactance simultaneously.
  • a variable reactance comprising a plurality of parallel conductive plates each having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, said loop and said surfaces being symmetrically distributed with respect to a central transverse plane through said plates, a plurality of positionable parallel members of substantial area having opposite halves symmetrically positioned on opposite sides of said transverse plane movably positioned within the interspa-ces between said plates and being juxtaposed in symmetrical re lation to said loops and said surfaces, and means for moving said positionable members parallel to said plates whereby the surface of said positionable members may be juxtaposed in varying proportions to said loop and said surfaces.
  • a variable reactance comprising a plurality of parallel conductive plates each having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, said loop and said surfaces being symmetrically distributed with respect to a central transverse plane through said plates, a plurality of positionable parallel members of substantial area having opposite halves symmetrically positioned on opposite sides of said transverse plane movably positioned within the interspaces between said plates and being juxtaposed in symmetrical relation to said loops and said surfaces, and means for moving said positionable members parallel to said plates to juxtapose the surface of said positionable members in varying proportions to said loop and said surfaces whereby motion of said positionable members in one direction effectively decreases both the inductance and capacitance of said reactance simultaneously and motion in the other direction simultaneously increases both the inductance and the capacitance of said reactance simultaneously.
  • a variable reactance comprising a plurality of parallel conductive plates each having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, a plurality of parallel positionable members of substantial area one of each being positioned in each of the interspaces between said plates in symmetrical relation with respect to said surfaces, said surfaces, said loops and said positionable members being symmetrically positioned with respect to a central transverse plane through said plates whereby electrical voltage and current relation-s in said plates are electrically balanced with respect to said transverse plane, and means for moving said positionable members parallel to and in proximity to said plates whereby the surface of said positionable members may be juxtaposed in varying proportions to said loops and said surfaces.
  • a variable reactance comprising a plurality of parallel conductive plates each having a loop constituting an inductive portion and surfaces of substantial area on opposite ends of said loop constituting a capacitative portion, said loops and said surfaces being symmetrically distributed with respect to a central transverse plane through said plates, a positionable member comprising a plurality of parallel plates of substantial area each having opposite halves symmetrically positioned on opposite sides of said transverse plane and juxtaposed in symmetrical relation to said loops and said surfaces, and mean-s for moving said positionable member parallel to and in proximity to said first mentioned plates to juxtapose the surface of said second mentioned plates in varying proportions to said loops and said surfaces whereby motion of said positionable memher in one direction effectively decreases both the inductance and capacitance of said reactance simultaneously and motion in the other direction simultaneously increases both the inductance and capacitance of said reactance simultaneously.

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US674971A 1946-06-07 1946-06-07 Balanced variable reactance device Expired - Lifetime US2471155A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE475353D BE475353A (ru) 1946-06-07
US674971A US2471155A (en) 1946-06-07 1946-06-07 Balanced variable reactance device
GB4767/48A GB637277A (en) 1946-06-07 1948-02-18 Improvements relating to variable reactances

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US674971A US2471155A (en) 1946-06-07 1946-06-07 Balanced variable reactance device

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US2471155A true US2471155A (en) 1949-05-24

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BE (1) BE475353A (ru)
GB (1) GB637277A (ru)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677769A (en) * 1951-03-09 1954-05-04 Ind Dev Engineering Associates High-frequency circuit chassis
US2839676A (en) * 1954-02-05 1958-06-17 Ebert Electronics Company High frequency tuners
US2866096A (en) * 1954-08-16 1958-12-23 Hoffman Electronics Corp Capacitively end tuned resonant line having inductive tracking trimmer mounted on capacitor rotor
US2871358A (en) * 1952-08-06 1959-01-27 Sarkes Tarzian Ultra-high-frequency tuner for television receivers
US2913674A (en) * 1955-02-16 1959-11-17 Standard Coil Prod Co Inc Sweep generator having electromagnetically driven tuning element
US3081406A (en) * 1958-09-13 1963-03-12 Int Standard Electric Corp Cryogenic bistable device
US3156884A (en) * 1962-04-30 1964-11-10 Aladdin Ind Inc Ultra high frequency tuner having rectilinearly sliding plates providing variable inductance and capacitance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085838A (en) * 1927-03-19 1937-07-06 Rca Corp Variable condenser
US2341345A (en) * 1940-10-26 1944-02-08 Gen Electric Tuning system
US2367681A (en) * 1941-12-10 1945-01-23 Gen Radio Co Ultra-high-frequency tuning apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085838A (en) * 1927-03-19 1937-07-06 Rca Corp Variable condenser
US2341345A (en) * 1940-10-26 1944-02-08 Gen Electric Tuning system
US2367681A (en) * 1941-12-10 1945-01-23 Gen Radio Co Ultra-high-frequency tuning apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677769A (en) * 1951-03-09 1954-05-04 Ind Dev Engineering Associates High-frequency circuit chassis
US2871358A (en) * 1952-08-06 1959-01-27 Sarkes Tarzian Ultra-high-frequency tuner for television receivers
US2839676A (en) * 1954-02-05 1958-06-17 Ebert Electronics Company High frequency tuners
US2866096A (en) * 1954-08-16 1958-12-23 Hoffman Electronics Corp Capacitively end tuned resonant line having inductive tracking trimmer mounted on capacitor rotor
US2913674A (en) * 1955-02-16 1959-11-17 Standard Coil Prod Co Inc Sweep generator having electromagnetically driven tuning element
US3081406A (en) * 1958-09-13 1963-03-12 Int Standard Electric Corp Cryogenic bistable device
US3156884A (en) * 1962-04-30 1964-11-10 Aladdin Ind Inc Ultra high frequency tuner having rectilinearly sliding plates providing variable inductance and capacitance

Also Published As

Publication number Publication date
BE475353A (ru)
GB637277A (en) 1950-05-17

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