WO2018130888A1 - Antenne comprenant un aéronef sans pilote - Google Patents

Antenne comprenant un aéronef sans pilote Download PDF

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Publication number
WO2018130888A1
WO2018130888A1 PCT/IB2017/057346 IB2017057346W WO2018130888A1 WO 2018130888 A1 WO2018130888 A1 WO 2018130888A1 IB 2017057346 W IB2017057346 W IB 2017057346W WO 2018130888 A1 WO2018130888 A1 WO 2018130888A1
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WO
WIPO (PCT)
Prior art keywords
antenna
frequency band
given frequency
coupling network
electrical conductors
Prior art date
Application number
PCT/IB2017/057346
Other languages
English (en)
Inventor
Frederic Broyde
Evelyne Clavelier
Original Assignee
Tekcem
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tekcem filed Critical Tekcem
Publication of WO2018130888A1 publication Critical patent/WO2018130888A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U10/00—Type of UAV
    • B64U10/60—Tethered aircraft
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/286—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft
    • H01Q1/287—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft integrated in a wing or a stabiliser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H01Q1/46—Electric supply lines or communication lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U2101/00—UAVs specially adapted for particular uses or applications
    • B64U2101/20—UAVs specially adapted for particular uses or applications for use as communications relays, e.g. high-altitude platforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U2201/00—UAVs characterised by their flight controls
    • B64U2201/20—Remote controls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U2201/00—UAVs characterised by their flight controls
    • B64U2201/20—Remote controls
    • B64U2201/202—Remote controls using tethers for connecting to ground station
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U50/00—Propulsion; Power supply
    • B64U50/10—Propulsion
    • B64U50/19—Propulsion using electrically powered motors

Definitions

  • Antenna comprising an unmanned aircraft
  • the invention relates to an antenna for radiocommunication, for instance an antenna for radio reception and/or radio emission in the frequency range 1.8 MHz to 30 MHz.
  • Efficient antennas for operation below 30 MHz must reach a sufficient height above ground, and possibly above surrounding trees or buildings.
  • a tubular pole or mast (with or without guys) may be satisfactory in the 10 MHz to 30 MHz frequency range.
  • Below 10 MHz there is typically a need to use a lattice tower.
  • a kite or a Charliere gas balloon to support an approximately vertical antenna.
  • the purpose of the invention is an antenna, without the above-mentioned limitations of known techniques.
  • Coupled always refer to an electrical coupling.
  • “coupled” may indicate that the items are directly coupled, that is to say connected (or, equivalently, in electrical contact) to one another, and/or that the items are indirectly coupled, in which case an electrical interaction different from direct coupling exists between the items, for instance through one or more components.
  • Coupled may indicate that the items are directly coupled, in which case each terminal of one of the items is directly coupled to one and only one terminal of the other item, and/or that the items are indirectly coupled, in which case an electrical interaction different from direct coupling exists between the terminals of the items, for instance through one or more components.
  • direct current means a current that is independent of time
  • d.c means direct current.
  • the apparatus of the invention is an antenna for radio transmission in a given frequency band, the antenna comprising:
  • an unmanned aircraft comprising n "aircraft power input terminals" to receive electric power, where n is an integer greater than or equal to 2;
  • each of the n electrical conductors being insulated from one another, each of the n electrical conductors having a first end and a second end, the first end of said each of the n electrical conductors being coupled to one and only one of the n aircraft power input terminals, each of the n aircraft power input terminals being coupled to the first end of one and only one of the n electrical conductors;
  • the coupling network comprising n "coupling network power input terminals" to receive electric power outside the given frequency band, the coupling network comprising n paths for a direct current, each of said paths for a direct current existing from one and only one of the coupling network power input terminals to the second end of one and only one of the n electrical conductors, the coupling network comprising a "signal terminal” for signals in the given frequency band, the coupling network comprising, for each of the n electrical conductors, a path for a current in the given frequency band, said path for a current in the given frequency band existing from the signal terminal to the second end of said each of the n electrical conductors.
  • each of said paths for a direct current may comprise an inductor, said inductor having a first terminal and a second terminal, the first terminal of said inductor being directly or indirectly coupled to one of the coupling network power input terminals, the second terminal of said inductor being directly or indirectly coupled to the second end of one of the n electrical conductors.
  • Said inductor may for instance be a choke coil.
  • each of said paths for a direct current may present a d.c. resistance less than or equal to 10 ohms, and each of said paths for a direct current may present, at any frequency in the given frequency band, an impedance having an absolute value greater than or equal to 250 ohms.
  • each of said paths for a current in the given frequency band may comprise a capacitor, said capacitor having a terminal which is directly or indirectly coupled to the signal terminal.
  • each of said paths for a current in the given frequency band may present, at any frequency in the given frequency band, an impedance having an absolute value less than or equal to 10 ohms, and each of said paths for a current in the given frequency band may present a d.c. resistance greater than or equal to 250 ohms.
  • Figure 1 is a drawing of an antenna of the invention (first and second embodiments);
  • Figure 2 is a schematic diagram of an antenna of the invention (first embodiment);
  • Figure 3 is a schematic diagram of an antenna of the invention (second embodiment);
  • Figure 4 is a drawing of an implementation of an antenna of the invention (second embodiment);
  • FIG. 5 is a schematic diagram of an antenna of the invention (third embodiment).
  • Figure 1 a drawing of an antenna for radiocommunication in a given frequency band, the given frequency band being a subset of the 500 kHz to 100 MHz frequency interval, the antenna comprising:
  • the coupling network comprising n "coupling network power input terminals" to receive electric power, said electric power resulting from an applied voltage at a frequency lower than any frequency in the given frequency band, the coupling network providing n paths for a direct current, each of said paths for a direct current existing between one and only one of the coupling network power input terminals and the second end of one and only one of the n electrical conductors, the coupling network comprising a "signal terminal", the signal terminal being intended to be used for signals in the given frequency band, the coupling network providing n paths for a current in the given frequency band, each of said paths for a current in the given frequency band existing between the signal terminal and the second end of one of the n electrical conductors.
  • Figure 2 shows a schematic diagram of the antenna.
  • the cable (2) comprises a first electrical conductor (21), a second electrical conductor (22) and a third electrical conductor (23).
  • the first electrical conductor (21) has a first end (211) and a second end (212).
  • the second electrical conductor (22) has a first end (221) and a second end (222).
  • the third electrical conductor (23) has a first end (231) and a second end (232).
  • the first ends (211) (221) (231) of the n electrical conductors are each coupled to one of the n aircraft power input terminals (141) (142) (143).
  • the coupling network (3) has a "coupling network power input connector" (31) comprising said n coupling network power input terminals (31 1) (312) (313).
  • the coupling network comprises n inductors (331) (332) (333) used as choke coils, each of said inductors having a first terminal and a second terminal, the first terminal of said each of said inductors being directly coupled to one and only one of the coupling network power input terminals, the second terminal of said each of said inductors being directly coupled to the second end of one and only one of the n electrical conductors.
  • the coupling network comprises n capacitors (351) (352) (353), each connected between one of the coupling network power input terminals and ground, these capacitors and said inductors forming n low-pass filters which each present, in the given frequency band, a high impedance to the second end of one of the n electrical conductors.
  • Said n paths for a direct current are: a first path from one of the coupling network power input terminals (311) to the second end (212) of the first electrical conductor, through one of the inductors (331); a second path from one of the coupling network power input terminals (312) to the second end (222) of the second electrical conductor, through one of the inductors (332); and a third path from one of the coupling network power input terminals (313) to the second end (232) of the third electrical conductor, through one of the inductors (333).
  • Each of said paths for a direct current presents a d.c. resistance less than or equal to 1 ohm, and each of said paths for a direct current presents, at any frequency in the given frequency band, an impedance having an absolute value greater than or equal to 500 ohms.
  • the coupling network comprises, for each of the n coupling network power input terminals, a path for a direct current, said path for a direct current existing from said each of the n coupling network power input terminals to the second end of one and only one of the n electrical conductors. It is also possible to say that the coupling network comprises, for each of the n electrical conductors, a path for a direct current, said path for a direct current existing from one and only one of the n coupling network power input terminals to the second end of said each of n electrical conductors.
  • the coupling network comprises n capacitors (341) (342) (343), each of these capacitors having a first terminal and a second terminal, the first terminal of said each of these capacitors being directly coupled to the signal terminal (321), the second terminal of said each of these capacitors being directly coupled to the second end of one and only one of the n electrical conductors.
  • Said paths for a current in the given frequency band are: a first path from the signal terminal (321) to the second end (212) of the first electrical conductor, through one of said capacitors (341); a second path from the signal terminal (321) to the second end (222) of the second electrical conductor, through one of said capacitors (342); and a third path from the signal terminal (321) to the second end (232) of the third electrical conductor, through one of said capacitors (343).
  • Each of said paths for a current in the given frequency band presents, at any frequency in the given frequency band, an impedance having an absolute value less than or equal to 1 ohm, and each of said paths for a current in the given frequency band presents an infinite d.c. resistance.
  • the unmanned aircraft (1) is capable of stationary flight.
  • the unmanned aircraft comprises: said aircraft power input terminals (141) (142) (143); 3 capacitors (121) (122) (123); and all other electrical components of the unmanned aircraft (11).
  • Said all other electrical components of the unmanned aircraft include one or more electric motors which provide the thrust necessary for flying.
  • the unmanned aircraft is intended to receive all the electric power it needs for flying from a generator coupled to the coupling network power input connector (31), said electric power being received through the inductors, the cable and the aircraft power input terminals.
  • the electric power is provided by the generator in the form of a three-phase system at a frequency less than or equal to 1600 Hz.
  • said electrical conductors are intended to substantially behave as 3 perfectly isolated electrical conductors.
  • the electric power received from the generator coupled to the n coupling network power input terminals is efficiently used to provide power to the unmanned aircraft.
  • the unmanned aircraft is remote-controlled by utilizing a radio link, said radio link operating outside the given frequency band.
  • the unmanned aircraft has an automatic landing function.
  • the automatic landing function is automatically triggered if: a voltage between two of said aircraft power input terminals (for instance, this voltage can be an rms voltage) is less than one of said one or more minimum voltages; and/or an electromagnetic interference is detected on the radio link utilized for remote- controlling the unmanned aircraft.
  • each of said capacitors (121) (122) (123) of the unmanned aircraft presents a low enough impedance at any frequency in the given frequency band
  • each of said capacitors (341) (342) (343) having a first terminal directly coupled to the signal terminal presents a low enough impedance at any frequency in the given frequency band.
  • incident electromagnetic waves in the given frequency band excite currents flowing along said electrical conductors (21) (22) (23) and in the unmanned aircraft (1), said currents causing a radio reception signal at the signal terminal (321).
  • said electrical conductors are intended to substantially behave as a single electrical conductor. For a radio reception without interference caused by the unmanned aircraft, it must have a sufficiently low electromagnetic emission in the given frequency band.
  • signals in the given frequency band can be efficiently (that is to say with zero or small loss) transferred from the second ends of the n electrical conductors to the signal terminal (for radio reception), and from the signal terminal to the second ends of the n electrical conductors (for radio emission).
  • Second embodiment best mode
  • Figure 1 a drawing of an antenna for radiocommunication in a given frequency band, the given frequency band being a subset of the 1 MHz to 30 MHz frequency interval, the antenna comprising:
  • a cable (2) comprising n electrical conductors which are insulated from one another, each of the n electrical conductors having a first end and a second end, the first end of said each of the n electrical conductors being coupled to one and only one of the n aircraft power input terminals, each of the n aircraft power input terminals being coupled to the first end of one and only one of the n electrical conductors;
  • the coupling network comprising n "coupling network power input terminals" to receive electric power, said electric power resulting from a voltage that is substantially independent of time (direct voltage), the coupling network comprising n paths for a direct current, each of said paths for a direct current existing from one and only one of the coupling network power input terminals to the second end of one and only one of the n electrical conductors, the coupling network comprising a "signal terminal” to deliver and/or receive signals in the given frequency band, the coupling network comprising n paths for a current in the given frequency band, each of said paths for a current in the given frequency band existing from the signal terminal to the second end of one of the n electrical conductors.
  • Figure 3 shows a schematic diagram of the antenna.
  • the cable (2) comprises a first electrical conductor (21) and a second electrical conductor (22).
  • the first electrical conductor (21) has a first end (211) and a second end (212).
  • the second electrical conductor (22) has a first end (221) and a second end (222).
  • the first ends (211) (221) of the n electrical conductors are each coupled to one of the n aircraft power input terminals (141) (142).
  • the coupling network (3) has a "coupling network power input connector" (31) comprising said n coupling network power input terminals (311) (314).
  • One of the coupling network power input terminals (314) is connected to the reference node (ground).
  • the coupling network comprises n inductors (331) (334), each of said inductors having a first terminal and a second terminal, the first terminal of said each of said inductors being directly coupled to one and only one of the coupling network power input terminals, the second terminal of said each of said inductors being directly coupled to the second end of one and only one of the n electrical conductors.
  • the coupling network comprises a capacitor (351) connected between one of the coupling network power input terminals and ground, this capacitor and one of the inductors (331) forming a low-pass filter which presents, in the given frequency band, a high impedance to the second end (212) of one of the n electrical conductors.
  • the other inductor (334) also presents a high impedance to the second end (222) of one of the n electrical conductors, in the given frequency band.
  • Said n paths for a direct current are: a first path from one of the coupling network power input terminals (311) to the second end (212) of the first electrical conductor, through one of the inductors (331); and a second path from one of the coupling network power input terminals (314) to the second end (222) of the second electrical conductor, through one of the inductors (334).
  • Each of said paths for a direct current presents a d.c. resistance less than or equal to 0.02 ohm, and each of said paths for a direct current presents, at any frequency in the given frequency band, an impedance having an absolute value greater than or equal to 1000 ohms.
  • the coupling network (3) has a "signal port" (32) comprising the signal terminal (321) and a terminal (322) connected to the reference node (ground).
  • the coupling network also comprises: a capacitor (341) having a first terminal and a second terminal, the first terminal of this capacitor being directly coupled to the signal terminal (321), the second terminal of this capacitor being directly coupled to the second end of one and only one of the n electrical conductors (222); and a capacitor (344) having a first terminal and a second terminal, the first terminal of this capacitor being directly coupled to the second end of one and only one of the n electrical conductors (212), the second terminal of this capacitor being directly coupled to the second end of one and only one of the n electrical conductors (222).
  • Said paths for a current in the given frequency band are: a first path from the signal terminal (321) to the second end (212) of the first electrical conductor, through two of said capacitors (341) (344); and a second path from the signal terminal (321) to the second end (222) of the second electrical conductor, through one of said capacitors (341).
  • Each of said paths for a current in the given frequency band presents, at any frequency in the given frequency band, an impedance having an absolute value less than or equal to 0.2 ohm, and each of said paths for a current in the given frequency band presents a substantially infinite d.c. resistance.
  • the unmanned aircraft (1) is of the type commonly referred to as "drone” or "unmanned aerial vehicle". More precisely, the unmanned aircraft is a quadcopter (that is to say a rotorcraft that is lifted by 4 rotors), weighing less than 3 kilograms.
  • the unmanned aircraft comprises: said aircraft power input terminals (141) (142); a capacitor (124); and all other electrical components of the unmanned aircraft (11). Said all other electrical components of the unmanned aircraft include 4 electric motors which provide the thrust necessary for flying.
  • the unmanned aircraft is intended to receive all the electric power it needs for flying from a generator coupled to the coupling network power input connector (31), said electric power being received through the inductors, the cable and the aircraft power input terminals.
  • the electric power is provided by the generator in the form of a voltage that is substantially independent of time.
  • said electrical conductors are intended to behave like 2 perfectly isolated electrical conductors.
  • each of said paths for a direct current presents a d.c. resistance less than or equal to 0.02 ohm
  • each of said paths for a current in the given frequency band presents an infinite d.c. resistance
  • the electric power received from the generator by the n coupling network power input terminals is efficiently transferred to the second ends of the n electrical conductors.
  • the electric power received from the generator coupled to the n coupling network power input terminals is efficiently used to provide power to the unmanned aircraft.
  • the unmanned aircraft is remote-controlled by utilizing a radio link, said radio link operating in the ISM band near 2.45 GHz, thus outside the given frequency band.
  • the unmanned aircraft has an automatic landing function which is automatically triggered if: the unmanned aircraft no longer receives, from (or through) the aircraft power input terminals, all the electric power it needs for flying; and/or electromagnetic interference is present on the radio link utilized for remote-controlling the unmanned aircraft.
  • the automatic landing function is automatically triggered if: a voltage between said aircraft power input terminals is less than said minimum voltage; and/or an electromagnetic interference is detected on the radio link utilized for remote-controlling the unmanned aircraft.
  • an electromagnetic interference maybe detected using an error detection code.
  • the unmanned aircraft comprises a rechargeable battery, which can provide enough electric energy to safely perform the automatic landing function in the case where the unmanned aircraft does not receive, from (or through) the aircraft power input terminals, all the electric power it needs for flying.
  • this rechargeable battery is small and light, because little energy is necessary to safely perform the automatic landing function.
  • the antenna is used for radio emission, a signal in the given frequency band is applied to the signal port (32), and excites currents flowing along said electrical conductors (21) (22) and in the unmanned aircraft (1), said currents causing the radio emission.
  • the unmanned aircraft must have a sufficiently high electromagnetic immunity to these currents. As regards these currents, said electrical conductors are intended to behave like a single electrical conductor.
  • said capacitor (124) of the unmanned aircraft presents a low enough impedance at any frequency in the given frequency band
  • said capacitor (344) having each of its terminals directly coupled to the second end of one and only one of the n electrical conductors presents a low enough impedance at any frequency in the given frequency band
  • incident electromagnetic waves in the given frequency band excite currents flowing along said electrical conductors (21) (22) and in the unmanned aircraft (1), said currents causing a radio reception signal at the signal port (32).
  • said electrical conductors are intended to behave like a single electrical conductor.
  • the unmanned aircraft must have a sufficiently low electromagnetic emission in the given frequency band.
  • signals in the given frequency band can be efficiently (that is to say with zero or small loss) transferred from the second ends of the n electrical conductors to the signal terminal (for radio reception), and from the signal terminal to the second ends of the n electrical conductors (for radio emission).
  • FIG. 4 shows a drawing of a use configuration of the antenna, the use configuration comprising:
  • the coupling network comprising said coupling network power input connector (31) and said signal port (32), the coupling network laying on the soil surface (45);
  • an earth connection (4) which couples the reference node (ground) of the coupling network to a ground system comprising 8 radial conductors (often referred to as "radials") laid on the soil, and/or one or more ground rods driven into the soil; a transceiver (5) for radiocommunication in the given frequency band, this transceiver comprising an automatic antenna tuner;
  • a coaxial cable (6) which couples the antenna port of the transceiver to the signal port (32); a power supply (7) which plays the role of the generator mentioned above;
  • a power supply cable (8) which couples the output of the power supply to the coupling network power input connector (31);
  • a remote control unit which is used to control the unmanned aircraft.
  • the end of the cable (2) where the second ends of the n electrical conductors are connected to different nodes of the coupling network is attached to the envelope of the coupling network.
  • the other end of the cable (2) is attached to the unmanned aircraft.
  • the unmanned aircraft has enough thrust to lift the cable (2), but not enough thrust to move the coupling network, so that the cable (2) takes on a nearly vertical position.
  • the remote control unit and the unmanned aircraft have an "automatic stationary flight" function, which, if manually activated, controls the flight to automatically obtain a nearly stationary and vertical position of the cable (2).
  • This use configuration of the antenna can be realized in less than 20 minutes by a single person, and it is not expensive.
  • the antenna of the invention is a low-cost solution to the problem of realizing a reliable and efficient antenna for operation below 30 MHz, without the time and the space needed to erect a mast or a tower.
  • FIG. 5 a schematic diagram of an antenna for radiocommunication in a given frequency band.
  • the given frequency band is the 3.5 MHz to 3.8 MHz frequency interval.
  • the antenna comprises: an unmanned aircraft (1); a cable (2); and a coupling network (3).
  • the cable (2) comprises a first electrical conductor (21) and a second electrical conductor (22).
  • the first electrical conductor (21) has a first end (211) and a second end (212).
  • the second electrical conductor (22) has a first end (221) and a second end (222).
  • the first ends (211) (221) of the 2 electrical conductors are each coupled to one of the 2 aircraft power input terminals (141) (142).
  • the coupling network (3) has a "coupling network power input connector" (31) comprising 2 coupling network power input terminals (311) (314). One of the coupling network power input terminals (314) is connected to the reference node (ground).
  • the coupling network comprises 2 inductors (331) (334), each of said inductors having a first terminal and a second terminal, the first terminal of said each of said inductors being directly coupled to one and only one of the coupling network power input terminals, the second terminal of said each of said inductors being directly coupled to the second end of one and only one of the 2 electrical conductors.
  • the coupling network comprises a capacitor (335) connected in parallel with one of the inductors (331) to obtain a first parallel resonant circuit presenting a very high impedance in the given frequency band.
  • the coupling network also comprises a capacitor (336) connected in parallel with the other inductor (334) to obtain a second parallel resonant circuit presenting a very high impedance in the given frequency band.
  • the coupling network comprises: a first path for a direct current from one of the coupling network power input terminals (311) to the second end (212) of the first electrical conductor, through one of the inductors (331); and a second path for a direct current from one of the coupling network power input terminals (314) to the second end (222) of the second electrical conductor, through one of the inductors (334).
  • Each of said paths for a direct current presents a d.c. resistance less than or equal to 0.02 ohm
  • each of said paths for a direct current presents, at any frequency in the given frequency band, an impedance having an absolute value greater than or equal to 5000 ohms.
  • the coupling network (3) has a "signal port" (32) comprising the signal terminal (321) and a terminal (322) connected to the reference node (ground).
  • the coupling network also comprises: a capacitor (341) having a first terminal and a second terminal, the first terminal of this capacitor being directly coupled to the signal terminal (321), the second terminal of this capacitor being directly coupled to the second end of one and only one of the 2 electrical conductors (222); a capacitor (342) having a first terminal and a second terminal, the first terminal of this capacitor being directly coupled to the signal terminal (321), the second terminal of this capacitor being directly coupled to the second end of one and only one of the 2 electrical conductors (212); and a capacitor (344) having a first terminal and a second terminal, the first terminal of this capacitor being directly coupled to the second end of one and only one of the 2 electrical conductors (212), the second terminal of this capacitor being directly coupled to the second end of one and only one of the 2 electrical conductors (222).
  • the coupling network comprises: a first path for a current in the given frequency band, from the signal terminal (321) to the second end (212) of the first electrical conductor, through one of said capacitors (342) in parallel with two of said capacitors (341) (344) connected in series; and a second path for a current in the given frequency band, from the signal terminal (321) to the second end (222) of the second electrical conductor, through one of said capacitors (341) in parallel with two of said capacitors (342) (344) connected in series.
  • Each of said paths for a current in the given frequency band presents, at any frequency in the given frequency band, an impedance having an absolute value less than or equal to 0.2 ohm, and each of said paths for a current in the given frequency band presents an infinite d.c. resistance.
  • the unmanned aircraft (1) comprises: said aircraft power input terminals (141) (142); a capacitor (124); two inductors (131) (132); and all other electrical components of the unmanned aircraft (11).
  • said electrical conductors (21) (22) substantially behave as a single electrical conductor for a current flowing along said conductors, at any frequency in the given frequency band; the unmanned aircraft has a sufficiently high electromagnetic immunity to currents flowing along said conductors and excited by a signal applied to the signal port in the given frequency band; and the unmanned aircraft has a sufficiently low electromagnetic emission in the given frequency band.
  • Said capacitor (124) and said two inductors (131) (132) of the unmanned aircraft form a low-pass filter presenting a low impedance to the cable (2) at any frequency in the given frequency band, which contributes to satisfy these requirements.
  • Said capacitors (341) (342) each having a first terminal which is directly coupled to the signal terminal (321) and a second terminal which is directly coupled to the second end of one and only one of the 2 electrical conductors
  • said capacitor (344) having a first terminal which is directly coupled to the second end of one and only one of the 2 electrical conductors (212) and a second terminal which is directly coupled to the second end of one and only one of the 2 electrical conductors (222), present a low impedance at any frequency in the given frequency band, so that they also contribute to satisfy said requirements.
  • the coupling network may be attached to a land vehicle, and used when the land vehicle does not move.
  • the antenna of the invention can be rapidly deployed in the field. It is suitable for reliable and efficient radiocommunication, without the time, the cost and the space needed to erect a mast or a tower.
  • the antenna of the invention is particularly suitable to quickly create a high performance station for radio emission and/or radio reception in the medium frequency band (hectometric waves) and/or in the high frequency band (decametric waves).
  • the antenna of the invention is suitable for long-range emergency radiocommunications in the context of a disaster, and for long-range tactical radiocommunications, in particular in circumstances where radio- communications by satellite cannot be used.
  • the antenna of the invention is also suitable for the amateur service, in particular for expeditions.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
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  • Details Of Aerials (AREA)

Abstract

L'invention concerne une antenne de radiocommunication, par exemple une antenne de réception et/ou d'émission radio dans la plage de fréquences de 1,8 MHz à 30 MHz. Une antenne de radiocommunication dans une bande de fréquences donnée est pourvue : d'un aéronef sans pilote (1) comprenant deux " bornes d'entrée de puissance d'aéronef " destinées à recevoir de l'énergie électrique; d'un câble (2) comprenant deux conducteurs électriques isolés l'un de l'autre, la première extrémité de chacun des conducteurs électriques étant couplée à une borne parmi les bornes d'entrée de puissance d'aéronef; d'un réseau de couplage (3) comprenant deux " bornes d'entrée de puissance de réseau de couplage " destinées à recevoir de l'énergie électrique en dehors de la bande de fréquence donnée, le réseau de couplage possédant deux voies destinées à un courant continu, une " borne de signal " destinée à des signaux dans la bande de fréquence donnée, et deux voies destinées à un courant dans la bande de fréquence donnée.
PCT/IB2017/057346 2017-01-12 2017-11-22 Antenne comprenant un aéronef sans pilote WO2018130888A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR17/70043 2017-01-12
FR1770043A FR3061807B1 (fr) 2017-01-12 2017-01-12 Antenne comportant un aeronef sans pilote

Publications (1)

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WO2018130888A1 true WO2018130888A1 (fr) 2018-07-19

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FR (1) FR3061807B1 (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11949150B1 (en) * 2020-05-22 2024-04-02 Hrl Laboratories, Llc Tethered unmanned aircraft antenna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB481950A (en) * 1936-09-18 1938-03-18 Standard Telephones Cables Ltd Wireless aerial systems
FR2707386A1 (fr) * 1993-07-05 1995-01-13 Thomson Csf Système d'observation aérienne à drone captif.
US20140327733A1 (en) * 2012-03-20 2014-11-06 David Wagreich Image monitoring and display from unmanned vehicle
US20150184639A1 (en) * 2013-12-31 2015-07-02 Google Inc. High Frequency Bi-directional AC Power Transmission
US20170125893A1 (en) 2015-10-30 2017-05-04 Thales Umbilical antenna structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB481950A (en) * 1936-09-18 1938-03-18 Standard Telephones Cables Ltd Wireless aerial systems
FR2707386A1 (fr) * 1993-07-05 1995-01-13 Thomson Csf Système d'observation aérienne à drone captif.
US20140327733A1 (en) * 2012-03-20 2014-11-06 David Wagreich Image monitoring and display from unmanned vehicle
US20150184639A1 (en) * 2013-12-31 2015-07-02 Google Inc. High Frequency Bi-directional AC Power Transmission
US20170125893A1 (en) 2015-10-30 2017-05-04 Thales Umbilical antenna structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11949150B1 (en) * 2020-05-22 2024-04-02 Hrl Laboratories, Llc Tethered unmanned aircraft antenna

Also Published As

Publication number Publication date
FR3061807A1 (fr) 2018-07-13
FR3061807B1 (fr) 2019-07-05

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