US1740969A - Duplex transmission system - Google Patents

Duplex transmission system Download PDF

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Publication number
US1740969A
US1740969A US97877A US9787726A US1740969A US 1740969 A US1740969 A US 1740969A US 97877 A US97877 A US 97877A US 9787726 A US9787726 A US 9787726A US 1740969 A US1740969 A US 1740969A
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US
United States
Prior art keywords
antenna
inductance
frequencies
transmission system
duplex transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US97877A
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English (en)
Inventor
Chireix Henri
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Individual
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Individual
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Publication date
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Publication of US1740969A publication Critical patent/US1740969A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation

Definitions

  • the present invention relates to radio communication apparatus by means of which two transmissions are sent out simultaneously by one and the same antenna.
  • the present invention has as its object to remedy the inconveniences in arrangements previously disclosed, by the simultaneous use for each of two transmissions of the entire 26 transmitting antenna.
  • two counterpoises are used provided in the neighborhood of each other and utilized to diminish in known manner the resistance of the aerialground circuit, and to play the part of catpacity in an auxiliary resonant circuit, with the end in view of imparting to the aerial two resonance periods.
  • the invention furthermore provides a simple arrangement adapted to prevent the flow of current from one of 30': the alternators into the other.
  • Fig. 1 is a circuit diagram of the arrangements
  • Fig. 2 shows an equivalent diagram in which the capacities between the counterpoises and between the aerial and each of the counterpoises are indicated in the form of condensers.
  • an antenna is shown at A, having in its circuit a tuning inductance L connected to an intermediate point of a second inductance L whose terminals are connected to different portions of a double counterpoise D.
  • the two portions of the latter are placed close enough together so that the required electrostatic capacity exists between them as explained below.
  • Two 53 alternators are shown at- A and A designed to generate respectively the two frequencies f and f to be transmitted.
  • the alternator A is connected to the antenna circuit by two inductive couplings M and M the former being in the antenna lead-in wire while the latter comprises the inductance L as one of its elements.
  • the alternator A is connected to the antenna by similar inductive couplings M and M
  • the equivalent circuit diagram shown in Fig. 2 makes it' clear that the system comprises, as a matter of fact, three circuits in electrostatic coupling relationship.
  • the generator A is united by electromagnetic couplings M and M, with the antennaground and the auxiliary circuit, respectively.
  • a duplex transmission system comprising a single transmission conductor, means connected thereto for simultaneously imparting two resonant frequencies to the system ;and means for supplying energy to said system at each of said frequencies.
  • a duplex transmission system comprising a transmission conductor, means connected thereto to impart two resonant frequencies ito the system, an energizing means for said system and means for coupling it thereto to permit energization at one of said frequencies and prevent energization at the other of said frequencies, a second energizing means for 5 said system acting simultaneously with the' first and means for coupling it thereto to permit energization at the second of said frequencies and prevent energization at the first of said frequencies.
  • An antenna system comprising an antenna, an inductance having said antenna connected thereto intermediate its ends and a separate counterpoise connected to each end of said inductance, the capacity of these counterpoises forming with said inductance a resonant circuit.
  • An antenna system comprising an antenna, two unequal inductance sections each having one end connected to'said antenna, a counterpoise connected to the other end of each of said inductance sections, said'counterpoises forming with both of said inductancesections a resonantcircuit.
  • a duplex transmission system comprising an antenna, an inductance having separate counterpoises connected to each end and forming therewith a resonant circuit, a lead connecting the antenna to an intermediate point of said inductance and two separate energizing means of difierent frequencies for energizing said system.
  • a duplex transmission system comprising an antenna, an inductance having a separate counterpoise connected to each end and forming therewith a resonant circuit, a lead connecting said antenna to an intermediate point of said inductance, two sources of high frequency current, inductive means for coupling each of said sources to said inductance, and means for coupling said sources to said lead.
  • a duplex transmission system comp'ris- HENRI GHIREIX.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
US97877A 1925-08-12 1926-03-27 Duplex transmission system Expired - Lifetime US1740969A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR614244T 1925-08-12

Publications (1)

Publication Number Publication Date
US1740969A true US1740969A (en) 1929-12-24

Family

ID=8980070

Family Applications (1)

Application Number Title Priority Date Filing Date
US97877A Expired - Lifetime US1740969A (en) 1925-08-12 1926-03-27 Duplex transmission system

Country Status (2)

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US (1) US1740969A (fr)
FR (1) FR614244A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839751A (en) * 1954-09-13 1958-06-17 Canadian Airborne Geophysics L Transmitting apparatus for inductive prospecting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839751A (en) * 1954-09-13 1958-06-17 Canadian Airborne Geophysics L Transmitting apparatus for inductive prospecting

Also Published As

Publication number Publication date
FR614244A (fr) 1926-12-09

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