US2375547A - Coupling system for loading devices such as aerials - Google Patents

Coupling system for loading devices such as aerials Download PDF

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Publication number
US2375547A
US2375547A US442373A US44237342A US2375547A US 2375547 A US2375547 A US 2375547A US 442373 A US442373 A US 442373A US 44237342 A US44237342 A US 44237342A US 2375547 A US2375547 A US 2375547A
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Prior art keywords
transmission line
coupling
resistance
aerials
coupling system
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Expired - Lifetime
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US442373A
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English (en)
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Gamet Pierre Paul
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H03H2/006—Transmitter or amplifier output circuits

Definitions

  • COUPLING SYSTEM FOR LOADING DEVICES SUCH AS- AERIALS Filed may 9, 1942 EL; WW
  • Rh E Patented May 8, 1945 COUPLING SYSTEM FOR LOADING DEV-ICES SUCH AS AERIALS Pierre Paul Garnet, Paris, France; vested in the Alien Property Custodian Application May 9; 1942,- Serial No.442,373 Y In France May 26, 1941. g
  • This invention has for its subjectmatter improvements in and relating to coupling systems for radio-frequency output devices such as antennas.
  • the matching over a wide range 'of wave lengths of a transmission line through a coupling box connected between the said transmission line and the output device or through'adjustable inductance coilsconnected in series in one of the conductors of the said transmission line obliges the operator to make an adjustment for the different operating wave lengths.
  • This adjustment is generally obtained by varying the electric'constants of the coupling impedances or the inductance coil connected in series in the transmission line.
  • the present invention has for its object to avoid these disadvantages and to permit of obtaining without diiferent adjustments a convenient matching of the transmission line from the point of view of the supply voltage over a wide range of wave lengths.
  • Another object of the invention is to remedy this inconvenience and to provide a device permitting to control the coupling values within certain limits.
  • Still another object of the present invention is to remedy these inconveniences and to provide a device which compensates in a certain measure for the differences in the energy produced by one of the radio generators, these differences bein due, for instance, to an accidental variation of the potential of the grid bias.
  • Figure 1 is a diagram of the coupling of a high frequency generator with a transmission line with stationary waves through a fixed resistance
  • Figure 2 is a diagram of the coupling of a highfrequencygenerator with a transmission: line with stationary waves through a variable resistance;
  • Figure 3 is a diagram of the coupling of a transmission line for stationary waves with two highfrequeney generators connected in parallel.
  • FIG. -1 The diagram shown in Figure -1 comprises a transmitter station I comprising an oscillatory circuit formedof a variable capacity 2 and of an inductor 3; a tap 4 provided on the inductor 3 g is connected with' a resistance 5 ill'SGliBS-jWith the conductor 6 of a co-axial transmission line I;
  • the oscillating circuit transmits the high-frequency oscillations which it produces to the output device 8 through the medium of the resist ance 5 and of the co-axial transmission line 1.
  • the input impedance of the unit formed of the co-axial transmission line 1 and the output device 8 varies as a function of the wave lengths which are produced by the generator I.
  • the high-frequency excitationvoltage varies.
  • the high-frequency excitation voltage is moderate and if the tap on the inductor 13 corresponds to an excitation'voltage which is higher than the voltage which had been intended, a voltage drop is pro-Y I **d across the terminals of the-resistance 5.
  • the impedance between the tap A and the output device 8' seen from the transmitter side is increased owing to the resistance.
  • the high-frequency excitation voltage is entirely transmitted; indeed, the value of the resistance 5 is negligible with respect to the input impedance ofv the transmission line.
  • the resistance 5 tends to bring the con- .nected impedance seen from the transmitter side to such a value that fixed coupling-is possible on the inductor 3.
  • the transmitter apparatus shown on Figure 2 j s is similar to that shown in Figure 1, but the fixed resistance 5 is replaced by a variable resistance I 9; The latter permits of varying within' certain limits the high frequency voltage transmitted by the generator I to the output device 8 owing to the voltage drop RI caused by the current flowing through the said resistance. When a loose coupling is desired, theres'i'stance is adjusted to the maximum of its value.” On the vcontrary,-when a close coupling is desired, the resistance is adhave been shown'at the input of the .co-axial point on the transmission line.
  • the transmitter apparatus shown in Fig ure 13 comprises two transmitter stations l0 and H" connected with a common transmission line through'zthe medium of resistances i3 and M,
  • 0 has-variable capacity 2 2; randifinductor -23, with tap 24, which correspond respectively to capacity 2, inductor 3- with tap 4, at station I inFig. 1;v vAlso in-Fi'g. 3,
  • the Istation H has variablescapacity 22a, and in duct'or 123a with variable 'tap- 2411, which :cor-respondwrespectively to capacity 2, and inductor r
  • Theoperation of the device i-s asjvfol-lowsz The current delivered; from the transmitters roams .flows through each of the resistances l3 and M; if, for any reason, for instance owing to anaccidental variation of the grid excitation, one of the transmitters produces alarger output, a stronger current flows through the corresponding resistance which dissipates more energy, thus tending to bring to its normal value the energy received-by the output device.
  • a pair of radimtrequency oscillator circuits each comprising an inductance having an adjustable tap, .a trans-mitting antenna unit, a -co-axial transmission line having its axial conductor connected to said antenna unit, and i-ndividualconnections each comprising a series resistance -ex' tending between the end of said axial aconduct'or remote from said antenna unit, and :said adjust able taps respectively.

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  • Transmitters (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
US442373A 1941-05-26 1942-05-09 Coupling system for loading devices such as aerials Expired - Lifetime US2375547A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR582133X 1941-05-26

Publications (1)

Publication Number Publication Date
US2375547A true US2375547A (en) 1945-05-08

Family

ID=8957824

Family Applications (1)

Application Number Title Priority Date Filing Date
US442373A Expired - Lifetime US2375547A (en) 1941-05-26 1942-05-09 Coupling system for loading devices such as aerials

Country Status (3)

Country Link
US (1) US2375547A (enrdf_load_stackoverflow)
FR (1) FR961704A (enrdf_load_stackoverflow)
GB (1) GB582133A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB582133A (en) 1946-11-06
FR961704A (enrdf_load_stackoverflow) 1950-05-19

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