US2485773A - Device for the alternating voltage supply of a load - Google Patents

Device for the alternating voltage supply of a load Download PDF

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Publication number
US2485773A
US2485773A US662023A US66202346A US2485773A US 2485773 A US2485773 A US 2485773A US 662023 A US662023 A US 662023A US 66202346 A US66202346 A US 66202346A US 2485773 A US2485773 A US 2485773A
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United States
Prior art keywords
bridge
voltage
supply
phase
vertex
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Expired - Lifetime
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US662023A
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English (en)
Inventor
Posthumus Klaas
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication of US2485773A publication Critical patent/US2485773A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/48—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source
    • H03H7/487—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source particularly adapted as coupling circuit between transmitters and antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/06—Rhombic antennas; V-antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/48—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source

Definitions

  • the invention relates to a device for the alternating voltage supply of a load consisting of two four terminal network having open and shortcircuited output terminals respectively; it may be applied with particular advantage to a radiotransmitter comprising a rhombic aerial.
  • Forsending out oscillations to be transmitted in one determined direction use may .be made of ,a rhombic aerial with which in order to avoid ,the production of stationary waves in the aerial,
  • the latter is closed at the end remote from the supply end by a resistance whose value corresponds to the surge impedance of the aerial.
  • the invention has for its object to provide a supply system wherein the closing resistance is suppressed.
  • a *singlerhombic aerial use is made in this case of" an aerial system which comprises two-rhombic aerialswhich are open and short-circuited respectively at the ends, which aerial system is, as is well-known, equivalent to the said single rhombic aerial.
  • a bridge circuit which comprises an impedance-inverting four terminal network ineach'of its branches whilst the phase displacement occurring between the output current and the input voltage of one of the four'terminal network isopposite to the corresponding phase displacement in the other four terminal network.
  • the rhombic aerials are connected in this case in two mutually opposite angular pointsof "the bridge circuit whereas to the two other angular pointsare applied Voltages of different values which are taken from the source of supply.
  • the supply system according to the invention may be utilized not only for supplying two rhombic'aerials in the manner indicated above but also in general for the supply of a load consisting of two four terminal network having open and short-circuited terminals respectively.
  • the circuit-arrangement according to the invention is equivalent to a circuit-arrangement wherein the'loadformed by the two .four terminal network is located directly between the pairs of supply terminals.
  • the impedance-inverting four terminal network are preferably ,utilizedsymmetrical vr-cells tuned to the operating wavelength, owing to which an ohmic load occurs for .the operating wavelength in the supply points of the bridge circuit and, besides, the bridge circuit itself can be realized with the raid :of ;.a small number of components.
  • Fig. 1 represents a circuit-arrangement ofan advantageous mode of a'realization of a device according to the invention in conjunction with a load consisting of two rhombic aerials.
  • Figs. 2 and 3 represent substitution diagrams for the rhombic aerials and the circuit-arrangement according to Fig. 1 respectively, whichserve to elucidate'the .operationiof the device according to the invention.
  • the 'loadto be supplied consists of two rhoznbic aerials I .and"2 of which the oneis open'at theireeend and the other'is short-circuited 'at' the corresponding end.
  • the aerials are supplied from atransmitter. 3 through the intermediary of a bridge circuit l whose branches :areformed by impedance-inverting four terminal network :5, .45, :1 and :8 respectively, which :are
  • the rhombicaerials I and 2 are connected in mutually 'op-posite'angular points of the bridge circuit whilst the two other angularpoints :are coupled, through theinterrnediary of lines 9 and H! (which in reality preferably have the same length) .to theoutput circuit of the transmitter 3 in such manner that at the angular points of .supply voltages of mutually different amplitudes areset up. Between'these two supply voltages must be maintained in this case a phasedifference chosen inaccordance with the dimensions of the rhombic aerials.
  • the first index-figure always refers to the :rhombiczaerial l-or 2 whilst thesecond index- :figure indicates whether the current and voltzages concerned correspond totthe wave'referred to hereinafter as the advancing .wave (index
  • the stationary wave in each of the two rhombs may be imagined to be resolved into two advancing waves opposed in direction, as indicated in Fig. 2 by I11, I12 and I21, I22.
  • I11, I12 and I21, I22 In the rhom'bic aerial I which is open at the free end (on the right-hand side in the figure) a wave advancing from the left to the right is produced due to the fact that a voltage V11 with a current I11 is applied to the supply end (on the left-hand side in the figure) whilst at the free end there occurs a voltage V11 and a current I'11.
  • a wave produced by reflection and advancing from the right to the left is set up due to the voltage V12 and the current 1'12 which prevail at the free end so that at the supply end there occur V12 and I12.
  • the various vectors are represented in the figure in the same way as with the rhombic aerial I.
  • V12 and V22 are automatically in antiphase, i. e.
  • the currents I11 and I21 are in this case likewise in phase and the currents I12 and I22 in anti-phase in corresponding points, with the result that upon superposition of the two rhombic ,aerials the waves advancing from the right to the left neutralize one another and that only the Waves advancing from the left to the right are operative, which is just desirable.
  • the current occurring in the supply point a is composed of four components I211, I212, I221 and I222, which correspond to V11, V12, V21 and V22 respectively.
  • phase of one of the supply voltages should preferably be regulable with the aid of means known in themselves for this purpose. It should be taken into account in this respect that the ratio between the amplitudes of these voltages Va and Vb only depends upon the damping in the circuit arrangement so that in adjusting the phase it must be possible to maintain unaltered the amplitudes of Va and Vb.
  • the supply voltage of regulable phase may be taken from a rotating field or, for example, the length of the supply line It] may be made adjustable, in which event, if required, separate means for regulating the amplitude of the supply voltage Vb may be utilized.
  • the length of the supply lines 9 and I0 should preferably be so chosen that the voltages set up at the supply ends of these lines are in phase or in antiphase, in which event the lines may be connected directly to the output circuit of the transmitter 3.
  • a particular advantage of the device represented resides in that simply by interchanging the supply ends of one of the rhombic aerials I and 2 it is possible to modify the main direction of radiation of the aerial system. Viewed in the projection on the plane of one of the rhombs, the main direction of radiation obtained after the reversal of the polarity is opposite to the initial main direction of radiation.
  • a system for energizing a load consistingoof two .rhombic antennas having open and :short circuited output terminals respectively,said:sys-
  • a four branch bridge each branch of which is definedby a four terminal phase-shifting network, each network being constituted by a symmetrical Pi section of inductive and capacitative elements tuned to the wavelength of said source, one of the networks providing a 90 degree phase displacement in one direction, the remaining networks each providing a 90 degree phase displacement in the reverse direction, the input terminals of one of the antennas being connected to one vertex of said bridge and the input terminals of the other antenna being connected to the opposing vertex of said bridge, means to apply a first voltage from said source to another vertex of said bridge, and means to apply a second voltage from said source to the vertex of said bridge opposing said another vertex, the value of said second voltage being different from said first voltage.
  • a system for energizing a load consisting of a pair of four terminal networks having open and short-circuited output terminals respectively, said system comprising a four branch bridge each branch of which is defined by a four terminal phase-shifting network, one of the networks in said bridge providing a 90 degree phase displacement in one direction, the remaining networks in said bridge each providing a 90 degree displacement in the reverse direction, the input terminals of one of the load networks being connected to one vertex of said bridge and the input terminals of the other load network being connected to the opposing vertex of said bridge, a source of alternating voltage, means to apply a first voltage from said source to another vertex of said bridge, means to apply a second voltage from said source to the vertex of said bridge opposing said another vertex, and means to adjust the phase displacement between said first and second voltages.
  • a system for energizing a load consisting of two rhombic antennas having open and shortcircuited output terminals respectively, said system comprising a source of high frequency energy, a four branch bridge each branch of which is defined by a four terminal phase-shifting network,
  • each network being constituted by a symmetrical Pi section of inductive and capacitative elements tunable to a desired wavelength, one of the networks providing a 90 degree phase displacement in one direction, the remaining networks each providing a 90 degree phase displacement in the reverse direction, the input terminal of one of the antennas being connected to one vertex of said bridge and the input terminals of the other antenna being connected to the opposing vertex of said bridge, means to apply a first voltage from said source to another vertex of said bridge, means to apply a second voltage from said source to the vertex oi said bridge opposing said another vertex, and means to adjust the relative phase displacements of said first and second voltages.
  • a system for energizing a load consisting of two rhombic antennas having open and shortcircuited output terminals respectively, said system comprising a source of high frequency energy having a predetermined wavelength, a four branch bridge each branch of which is defined by a four terminal phase-shifting network, each network being constituted by a symmetrical Pi section of inductive and capacitative elements tuned to the wavelength of said source, one of the networks providing a 90 degree phase displacement in one direction, the remaining networks each providing a 90 degree phase displacement in the reverse direction, the input terminals of one of said antennas being connected to one vertex of said bridge and the input terminals of the other antenna being connected to the opposing vertex of said bridge, a first transmission line for applying a first voltage from said source to another vertex of said bridge, and a second transmission line for applying a second voltage from said source to the vertex of said bridge opposing said another vertex, said lines having respective lengths efiecting a predetermined phase displacement between the first and second voltages applied to said bridge.
  • a system in accordance with claim 5 further including means for interchanging the connections of the input terminals of said antennas to said one vertex and said vertex opposing said one vertex of the bridge.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
US662023A 1943-06-01 1946-04-13 Device for the alternating voltage supply of a load Expired - Lifetime US2485773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL250782X 1943-06-01

Publications (1)

Publication Number Publication Date
US2485773A true US2485773A (en) 1949-10-25

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Application Number Title Priority Date Filing Date
US662023A Expired - Lifetime US2485773A (en) 1943-06-01 1946-04-13 Device for the alternating voltage supply of a load

Country Status (7)

Country Link
US (1) US2485773A (de)
BE (1) BE456147A (de)
CH (1) CH250782A (de)
DE (1) DE862176C (de)
FR (1) FR905411A (de)
GB (1) GB637171A (de)
NL (1) NL67941C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667204A (en) * 1985-04-08 1987-05-19 Hedrick James D Combination dual rhombic and V-type antenna for VHF-UHF television receivers
US5657030A (en) * 1993-09-14 1997-08-12 Peck; William H. Collapsible single or multielement rhombic antennas

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973146C (de) * 1953-07-23 1959-12-10 Telefunken Gmbh Antennenanordnung fuer einen weiten Frequenzbereich

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2147809A (en) * 1937-05-04 1939-02-21 Mackay Radio & Telegraph Co High frequency bridge circuits and high frequency repeaters
US2283897A (en) * 1939-04-26 1942-05-26 Internat Telephone & Radio Mfg Antenna system
US2416790A (en) * 1941-01-28 1947-03-04 Sperry Gyroscope Co Inc Transmission line bridge circuit
US2445895A (en) * 1942-12-31 1948-07-27 Bell Telephone Labor Inc Coupling arrangement for use in wave transmission systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2147809A (en) * 1937-05-04 1939-02-21 Mackay Radio & Telegraph Co High frequency bridge circuits and high frequency repeaters
US2283897A (en) * 1939-04-26 1942-05-26 Internat Telephone & Radio Mfg Antenna system
US2416790A (en) * 1941-01-28 1947-03-04 Sperry Gyroscope Co Inc Transmission line bridge circuit
US2445895A (en) * 1942-12-31 1948-07-27 Bell Telephone Labor Inc Coupling arrangement for use in wave transmission systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667204A (en) * 1985-04-08 1987-05-19 Hedrick James D Combination dual rhombic and V-type antenna for VHF-UHF television receivers
US5657030A (en) * 1993-09-14 1997-08-12 Peck; William H. Collapsible single or multielement rhombic antennas

Also Published As

Publication number Publication date
DE862176C (de) 1953-01-08
FR905411A (fr) 1945-12-04
GB637171A (en) 1950-05-17
BE456147A (de)
CH250782A (de) 1947-09-15
NL67941C (de)

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