• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This emitter (10) of electromagnetic waves comprises: - a reverberant cavity (12), - at least one primary antenna (14) for emitting a primary electromagnetic wave in the reverberant cavity (12) under the effect of a signal d an excitation, - a plurality of secondary antennas (20) each comprising an emitting portion (32) outside the reverberation cavity (12) and a receiving portion (34) within the reverberation cavity (12) , each secondary antenna (20) being adapted for the transmitting part (32) to emit a secondary electromagnetic wave outside the reverberation cavity (12) under the effect of an electromagnetic excitation wave received by the receiving part (34) - a system (16) for generating an excitation signal of the or each primary antenna (14), and - a member (18) for transmitting the excitation signal to the or each primary antenna (14).
    公开号:FR3030904A1
    申请号:FR1402979
    申请日:2014-12-23
    公开日:2016-06-24
    发明作者:Henri Vallon；Anne Sophie Chauchat；Dominique Fasse；Andrea Cozza；Quentin Kassab；Jean-Pierre Brasile
    申请人:Thales SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to an emitter of electromagnetic waves, of the type comprising: a reverberant cavity, at least one primary antenna for emitting a primary electromagnetic wave into the reverberant cavity under the reverberation cavity. the effect of an excitation signal, a plurality of secondary antennas each comprising a transmitting part outside the reverberation cavity and a receiving part inside the reverberation cavity, each secondary antenna being adapted so that the transmitting part emits a secondary electromagnetic wave outside the reverberation cavity under the effect of an excitation electromagnetic wave received by the receiving part, a system for generating an excitation signal of the or each primary antenna, and a device for transmitting the excitation signal to the or each primary antenna. Transmitters employing reverberant cavities, as described in FR-A2 985 385, FR-A-2 985 386, and "UWB Antennas Beamforming Using Passive Time-Reversal Device" (D. Carsenat, C. Decroze, IEEE Antennas and Wireless Propagation Letters, 11, 2012) have been developed. The transmitters described in FR-A-2 985 385 and FRA-2 985 386 have the advantage of enabling the generation of high peak powers over a wide frequency band, and the generation of waves of complex shape. The transmitters presented in "UWB Antennas Beamforming Using Passive Time-Reversal Device" (D. Carsenat, C. Decroze, IEEE Antennas and Wireless Propagation Letters, vol 11, 2012) allow to increase the directionality of the beam and to choose the direction radiation using an array of antennas. A disadvantage of known reverberant cavity emitters is that, to enable the wave generated in various directions to be oriented, it is necessary to equip the transmitter with a plurality of secondary antennas. However, it is at the same time desirable to limit the number of secondary antennas to avoid energy losses out of the cavity and keep an important quality factor. A compromise must therefore be found between the opening of the emission angle of the transmitter and the power of the waves that can be generated by this transmitter.
    [0002] An object of the invention is to allow the emission of electromagnetic waves in various directions by means of the same transmitter, minimizing energy losses. Another objective is to limit the cost of the issuer. To this end, the subject of the invention is an emitter of electromagnetic waves of the above-mentioned type, in which each secondary antenna is adapted to switch between a passing state, in which the transmitting and receiving parts of the secondary antenna are electromagnetically coupled to each other. to one another, so that the reception of an electromagnetic excitation wave by the receiving part results in the emission of a secondary electromagnetic wave by the emitting part, and a blocking state, in which the emitting parts and receiver are decoupled electromagnetically from each other, so that the reception of an electromagnetic wave by the receiving part has no effect on the emitting part. According to particular embodiments of the invention, the emitter of electromagnetic waves also has one or more of the following characteristics, taken in isolation or according to any combination (s) technically possible (s): the generation system is adapted so that the primary electromagnetic wave (s) emitted by the primary antenna (s) interact (s) constructively at the level of the part receiving at least one of the secondary antennas to form an electromagnetic excitation wave of said secondary antenna, the electromagnetic excitation wave having an amplitude greater than the amplitude of the or each primary electromagnetic wave, - the cavity is defined within walls surrounding the cavity, the receiving portions of the secondary antennas being distributed along said walls; the receiving parts of the secondary antennas are randomly distributed along the g of the walls of the cavity, - each secondary antenna differs from each other secondary antenna for at least one of the following parameters: direction of emission of the secondary electromagnetic wave emitted by the transmitting part of said secondary antenna, polarization of said electromagnetic wave secondary, phase of said secondary electromagnetic wave, bandwidth of the secondary antenna, and center frequency of the transmitting part of the secondary antenna, - each secondary antenna comprises a switch for switching the secondary antenna selectively in its on state or in its blocking state, the switch consists of an electromechanical switch, or a PIN diode, and it comprises a control module adapted to control the generation system and to control the switches of the secondary antennas. The invention also relates to a method of emitting a high power electromagnetic wave by an emitter of electromagnetic waves as defined above, the method comprising the following steps: providing the transmitter, each secondary antenna state in a first state among its blocking and passing states, generation of an excitation signal of the or each primary antenna, transmission of the excitation signal to the or each primary antenna, transmission, by the or each primary antenna, under the effect of the excitation of said primary antenna by the excitation signal transmitted to it, of a primary electromagnetic wave, switching in its second state of at least one secondary antenna, constructive interaction of the wave or waves ( s) primary electromagnetic (s) emitted by the primary antenna (s) at the receiving part of the or each secondary antenna which, after switching, is in its t passing, to form an electromagnetic wave excitation of said secondary antenna, the electromagnetic excitation wave having an amplitude greater than the amplitude of the or each primary electromagnetic wave, and emission of a secondary electromagnetic wave by the transmitting part of the or each secondary antenna which is in its conducting state, under the effect of the electromagnetic wave excitation of said secondary antenna. According to a particular embodiment of the invention, the method further comprises one or more of the following characteristics, taken alone or according to any combination (s) technically possible (s): - the first state of each secondary antenna is its passing state. it further comprises a step of choosing a firing direction of the emitter of electromagnetic waves, and the switching step is adapted so that, after said switching, any contributing secondary antenna having a positive contribution to the power an electromagnetic wave emitted by the emitter of electromagnetic waves in the selected firing direction is in its on state, and that any other secondary antenna is in its blocking state, - the switching step is the switching of the or each contributing secondary antenna from its blocking state to its on state.
    [0003] Other characteristics and advantages of the invention will appear on reading the description which follows, given solely by way of example and with reference to the appended FIGURE, which is a schematic representation of a transmitter according to FIG. invention.
    [0004] The transmitter 10 shown in FIG. Comprises a reverberant cavity 12, a primary antenna 14 for emitting a primary electromagnetic wave in the reverberant cavity 12, a system 16 for generating an electrical signal for exciting the primary antenna 14, a member 18 for transmitting the electrical excitation signal to the primary antenna 14, and a plurality of secondary antennas 20.
    [0005] The reverberant cavity 12 has, in known manner, equidistributed field or diffuse field properties with respect to the propagation of electromagnetic waves inside the cavity 12. For this purpose, the cavity 12 has irregular shapes, so that for any electromagnetic wave propagating / circulating inside the cavity 12, the field density of said electromagnetic wave is homogeneous and isotropic throughout the cavity 12 Preferably, the cavity 12 also contains diffusers, such as metal rods or plates, in order to reinforce the equidistribution properties of the field in the cavity 12. The cavity 12 is defined inside walls 22 which surround the cavity. cavity 12.
    [0006] Said walls 22 are advantageously all reflective and adapted to limit the electromagnetic losses inside the cavity 12. For this purpose, the walls 22 are typically made of metal, for example steel. Furthermore, the cavity 12 is adapted to allow the diffusion conditions and necessary mixtures between the primary and secondary antennas 14. In other words, the cavity 12 is adapted so that any wave emitted into the cavity 12 by one primary 14 and secondary antennas 20 is forced to reflect on at least one of the walls 22 of the cavity to reach one of the secondary antennas 20, respectively to the primary antenna 14. The primary antenna 14 is adapted to transmit the primary electromagnetic wave under the effect of the electrical excitation signal generated by the system 16. For this purpose, the primary antenna 14 is typically constituted by an antenna element passing through a wall 22 of the cavity 12 and adapted to emit a electromagnetic wave when excited by an electric current. Alternatively, the primary antenna 14 is constituted by a plurality of antenna elements passing through a wall 22 of the cavity 12.
    [0007] The generation system 16 comprises a signal generation and processing unit 24, programmed to generate a primary electrical signal. Preferably, it also comprises, as shown, an amplification stage 26. The amplification stage 26 is, in the example represented, constituted by a solid-state amplifier electrically interposed between an output 28 of the signal unit. generation and signal processing 24 and the transmission member 18. The transmission member 18 is formed by an electrical connection between the primary antenna 14 and the generation system 16. Said electrical connection is preferably switchable.
    [0008] Each secondary antenna 20 has an emitter portion 32 outside the reverberant cavity 12 and a receiver portion 34 inside the reverberant cavity 12, each secondary antenna 20 being adapted for the emitting part 32 to emit a secondary electromagnetic wave. outside the reverberant cavity 12 under the effect of an electromagnetic excitation wave received by the receiving part 34. It will be noted that, although the parts 32 and 34 are described respectively as "transmitter" and "receiver", these functions Parts 32 and 34 are not exclusive; the emitting part 32 is thus also adapted to receive electromagnetic waves circulating outside the cavity 12, and the receiving part 34 is also adapted to emit electromagnetic waves inside the cavity 12.
    [0009] Each secondary antenna 20 is for example formed by a conductive element extending through a wall 22 of the cavity 12. In a variant, each secondary antenna 20 is formed by a slot formed in a wall 22 of the cavity 12. Transmitter portion 32 of each secondary antenna 20 is specifically shaped to impart to the secondary wave emitted by said transmitting portion 32 a predetermined polarization, phase and transmission direction. The conformation of the transmitting part 32 also influences the bandwidth of the secondary antenna 20. Preferably, the conformation of the transmitting part 32 of each secondary antenna 20 is specific to said secondary antenna 20, so that each secondary antenna 20 differs from each other secondary antenna 20 for at least one of the following parameters: emission direction of the secondary electromagnetic wave emitted by the transmitting part 32 of said secondary antenna 20, polarization of said secondary electromagnetic wave, phase of said secondary electromagnetic wave , bandwidth of the secondary antenna 20, and central frequency of the transmitting part 32 of the secondary antenna 20.
    [0010] The transmitting portions 32 of the secondary antennas 20 are preferably arranged in such a way that the transmitter 10 can emit an electromagnetic wave in any direction of space. As a variant, the emitter portions 32 of the secondary antennas 20 are arranged in such a way that the emitter 10 can emit an electromagnetic wave in any half-space direction. The receiving portions 34 of the secondary antennas 20 are distributed along the walls 22 of the cavity 12. They are in particular distributed randomly along said walls 22, that is to say that the positions of all or part of the antennas 20 form no figure of symmetry.
    [0011] Alternatively, the receiving portions 34 of the secondary antennas 20 are arrayed, i.e. the positions of at least a portion of the antennas 20 form a geometric figure with one or more symmetries. The generation system 16 is adapted so that each primary electromagnetic wave emitted by the primary antenna constructively interact at the receiving portion 34 of a portion of the secondary antennas 20 to form an electromagnetic excitation wave of said secondary antennas 20, each electromagnetic excitation wave having an amplitude greater than the amplitude of the primary electromagnetic wave. For this purpose, the signal generation and processing unit 24 is programmed by applying the time reversal principle. This programming is in particular carried out as described below. First, the secondary antennas 20 are configured so that the secondary antennas 20 of a first group of secondary antennas are in their on state, the other secondary antennas 20 being in their blocking state. Then, a first electromagnetic calibration wave is emitted by the emitter portion 24 of one of the secondary antennas 20 of the first group. This electromagnetic calibration wave is preferably a pulse. The first electromagnetic calibration wave diffuses into the cavity 12 and is received, diffusely and spread out over time, by the primary antenna 14. This spreading makes it possible to obtain a signal received at the level of the primary antenna 14 plus long with a much lower peak power than the initial calibration signal. This ratio between the received signal and the calibration wave makes it possible to obtain an amplification margin which will make it possible to obtain a much higher peak power than that of the calibration wave when transmitting the signal. an electromagnetic wave by the transmitter 10.
    [0012] The reception of this wave by the antenna 14 causes the generation of an electrical calibration signal which is recorded and compared with the electromagnetic one of calibration. It is deduced a first frequency transfer matrix Ho of the cavity 12 for the transmission of electromagnetic waves between the secondary antenna 20 and the primary antenna 14, according to a method such as that described in the article by HC Song, S. Kim, WS Hodgkiss, and WA Kuperman entitled "Environmentally adaptive reverberation nulling a time reversal mirror", The Journal of the Acoustical Society of America, 2004, vol. 116, No. 2, pp 762-768. This step is repeated for each of the secondary antennas 20 of the first group of secondary antennas. The secondary antennas 20 are then reconfigured so that the secondary antennas 20 of a second group of secondary antennas are in their on state, the other secondary antennas 20 being in their blocking state. Then, a second electromagnetic calibration wave is emitted by the emitter portion 24 of one of the secondary antennas 20 of the second group. This electromagnetic calibration wave is preferably a pulse.
    [0013] The second electromagnetic calibration wave diffuses into the cavity 12 and is received, diffusely and spread over time, by the primary antenna 14. The reception of this wave by the antenna 14 causes the generation of an electrical signal calibration that is recorded and compared to the electromagnetic one of calibration. A second frequency transfer matrix HK2 is deduced from the cavity 12 for transmitting electromagnetic waves between the secondary antenna 20 and the primary antenna 14, according to a method similar to that used for calculating the first frequency matrix. This step is repeated for each of the secondary antennas 20 of the second group of secondary antennas.
    [0014] The preceding steps are repeated for the antennas 20 of a plurality of secondary antenna groups, a frequency transfer matrix Hki (with j between 3 and N, N being the number of secondary antenna groups) being calculated for each 20. Finally, the signal generation and processing unit 30 is programmed to generate, for each group of secondary antennas 20, a primary electrical signal Zj (w), with j lying between 1 and N, the signal primary circuit having the following frequency spectrum: X (w) A x ak (W) X n where X (w) is the frequency spectrum of an electromagnetic wave that is to be transmitted by means of the transmitter 10 when each antenna 20 of the group of secondary antennas is in its path, A is the amplification factor provided by the amplifier 26, ak (w) is a phase shift signal applied to each antenna 20 of the group of secondary antennas, and j * is the complex conjugate matrix e of the frequency transfer matrix 1-1k ,. In the example shown, the transmitter 10 also comprises stirrers 35 positioned in the cavity 12. These stirrers 35 are typically constituted by metal plates. The location of the stirrers 35 in the cavity 12 is adapted to maximize the gain provided by the reverberant cavity 12; in other words, the location of the stirrers 35 in the cavity 12 is constituted by the position of the stirrers 35 in the cavity 12 for which the ratio of the peak power of the electromagnetic wave emitted by the transmitter 10 on the peak power of the primary electrical signal generated by the signal generator 24 is maximum. The location of the brewers 35 is determined by the method described below. First, the stirrers 35 are positioned in the cavity 12 in a random position. Then a programming of the generation and signal processing unit 24 is carried out by means of the programming method described above. The peak power of the primary electrical signal obtained by said programming is stored. Thereafter, the stirrers 35 are moved so as to occupy a new position in the cavity 12. A new programming of the signal generation and processing unit 24 is carried out by means of the programming method described above. electromagnetic calibration wave used being identical to the electromagnetic calibration wave used during the first programming. The peak power of the primary electrical signal obtained with this second programming is in turn memorized. This step is then repeated for all possible positions of the stirrers 35 in the cavity 12. Finally, the peak powers memorized for the different positions of the stirrers 35 are compared with each other, so as to identify the position of the stirrers 35 for which the peak power is minimal. The stirrers 35 are then repositioned at this position, said position constituting the location of the stirrers 35. According to the invention, each secondary antenna 20 is adapted to switch between a passing state, in which the transmitting 32 and receiving 34 portions of the antenna 20 are electromagnetically coupled to one another, so that the reception of an electromagnetic excitation wave by the receiver part 32 results in the emission of a secondary electromagnetic wave by the emitting part 34, and a blocking state, in which the emitter 32 and receiver 34 are decoupled electromagnetically from each other, so that the reception of any electromagnetic wave by the receiving part 32 has no effect on the emitting part 34.
    [0015] For this purpose, each secondary antenna 20 comprises a switch 36 for switching the secondary antenna 20 selectively in its on state or in its blocking state, and the transmitter 10 comprises a control module 38 of the switches 30. The transmitter 10 comprises also a man-machine interface 40, for the entry by an operator of a firing instruction of the transmitter 10 in a firing direction chosen by the operator. The switch 36 is electrically interposed between the transmitter 32 and receiver 34 portions of the secondary antenna 20. It is adapted to switch between a closed state, in which it provides an electrical connection between the transmitting and receiving portions 32, 34, and a an open state in which it electrically isolates the emitter and receiver portions 32, 34 from each other. The switch 36 consists for example of a PIN diode ("Positive Intrinsic Negative Diode" in English). Thus, the switch 36 is adapted to switch quickly between its open and closed states, typically in a time less than 10 ns. In a variant, the switch 36 consists of an electromechanical switch.
    [0016] The control module 38 is electrically connected to a port (not shown) for controlling each switch 36, to control the switching of each switch 36. It is also electrically connected to a control port 42 of the generating and switching unit. signal processing 24, for controlling the generation and signal processing unit 24. It is also electrically connected to the man-machine interface 40, for the reception of the firing instruction. The control module 38 is programmed to derive from the firing instruction an electrical control signal from the generation and signal processing unit 24 and an electrical control signal from the switches 36, and to send the electrical control signal to the signal generation and processing unit 24 and the electrical control signal to the switches 36. The electrical control signal is adapted to control the switching of a predetermined group of switches among the switches 36 so that, after this switching, only secondary antennas contributing to the direction of shooting chosen by the operator, taken among the secondary antennas 20, are in their on state.
    [0017] The contributing secondary antennas are adapted so that the emission of secondary electromagnetic waves by said contributing secondary antennas results in the emission by the transmitter 10 of an electromagnetic wave in the firing direction chosen by the operator. They have preferably been determined during a step of determining the contributing secondary antennas, during which it has been determined, for each secondary antenna 20 and for each firing direction, whether the emission of a secondary electromagnetic wave by said secondary antenna 20 contributed positively or negatively to the power of a wave emitted by the transmitter 10 in the firing direction, only the secondary antennas 20 having a positive contribution being determined as contributing secondary antennas for said firing direction. In particular, the contributing secondary antennas all belong to the same group of secondary antennas among the groups of secondary antennas successively switched during the programming process. The electrical control signal is adapted to cause generation, by the signal generation and processing unit 24, to generate a primary electrical signal from the plurality of primary electrical signals programmed for the signal generation and processing unit. 24. The electrical control signal is in particular adapted so that the primary electrical signal thus generated by the signal generation and processing unit 24 generates the formation of electromagnetic excitation waves at the receiving part 34 of each contributing secondary antenna. For this purpose, the electrical control signal is adapted so that the primary electrical signal generated is the electrical signal programmed for the group of secondary antennas to which the contributing secondary antennas belong. A method of emitting an electromagnetic wave by means of transmitter 10 will now be described with reference to FIG. In the initial state, no signal is emitted by the signal generation and processing unit 24, and the secondary antennas 20 are each in a first state of their passing and blocking states. This first state is preferably the blocking state. First, an operator chooses a firing direction of the transmitter 10. He then uses the man-machine interface 42 to communicate to the transmitter 10 a firing instruction in the chosen direction. This firing instruction is received by the control module 38, which deduces a control signal from the signal generation and processing unit 24. It also deduces therefrom a control signal from the switches 36.
    [0018] The control signal is transmitted to the switches 36. Under the effect of this signal, a portion of the secondary antennas 20 switch in their second state so that, after this switching, only the secondary antennas contributing to the firing direction chosen by the operator are in their on state. Preferably, the secondary switching antennas 20 are all the secondary antennas 20 with the exception of the contributing secondary antennas, switching from the on state to the blocking state. In a variant, the secondary switching antennas 20 are the contributing secondary antennas, the switching being from the on state to the blocking state. The control signal is transmitted to the signal generation and processing unit 24, which then generates a primary electrical signal. This primary electrical signal is amplified by the amplification stage 26, and is thus amplified to the primary antenna 14. The primary antenna 14 thus receives an excitation signal constituted by the amplified primary electrical signal. Under the effect of this excitation signal, the primary antenna 14 begins to emit a primary electromagnetic wave in the cavity 12. This primary electromagnetic wave, after reflection on the walls 22 of the cavity 12, constructively interacts with it. even at the receiving part 34 of each contributing secondary antenna, so as to produce an excitation wave of each contributing secondary antenna. Under the effect of the excitation of each contributing secondary antenna induced by this excitation wave, the emitting part 32 of said antenna finally emits a secondary electromagnetic wave outside the cavity 12. This secondary electromagnetic wave constructively interacts with waves other secondary electromagnetic waves so as to form a high power electromagnetic wave, oriented in the firing direction chosen by the operator.
    [0019] By a controlled addressing of the secondary antennas 20 using the time reversal, the invention described above thus allows the pointing of an electromagnetic wave beam in all directions of space. In addition, by allowing the deactivation of secondary antennas 20 which are not addressed, the invention makes it possible to increase the directivity of the transmitter 10 in the desired direction while keeping a good quality factor necessary for a better performance of the transmitter. time reversal technique used. Finally, the invention allows the realization of compact and inexpensive transmitters.
    权利要求:
    Claims (12)
    [0001]
    A transmitter (10) for electromagnetic waves, comprising: a reverberant cavity (12), at least one primary antenna (14) for emitting a primary electromagnetic wave into the reverberant cavity (12) under the effect of a signal excitation circuit, a plurality of secondary antennas (20) each comprising an emitter portion (32) outside the reverberation cavity (12) and a receiver portion (34) within the reverberation cavity (12) , each secondary antenna (20) being adapted for the transmitting part (32) to emit a secondary electromagnetic wave outside the reverberation cavity (12) under the effect of an electromagnetic excitation wave received by the receiving part (34) , a system (16) for generating an excitation signal of the or each primary antenna (14), and a member (18) for transmitting the excitation signal to the or each primary antenna (14), characterized in what each secondary antenna ( 20) is adapted to switch between an on state, wherein the transmitter (32) and receiver (34) portions of the secondary antenna (20) are electromagnetically coupled to one another, so that the reception of an electromagnetic excitation wave by the receiving part (34) results in the emission of a secondary electromagnetic wave by the transmitting part (32), and a blocking state, in which the emitting (32) and receiving (34) parts are electromagnetically decoupled from one another, so that the reception of an electromagnetic wave by the receiving part (34) has no effect on the emitting part (32).
    [0002]
    2. An electromagnetic wave transmitter (10) according to claim 1, wherein the generating system (16) is adapted so that the primary electromagnetic wave (s) emitted by the or the primary antenna (s) interact (s) constructively at the receiving portion (34) of at least one of the secondary antennas (20) to form an electromagnetic excitation wave of said secondary antenna (20) the electromagnetic excitation wave having an amplitude greater than the amplitude of the or each primary electromagnetic wave.
    [0003]
    3. An electromagnetic wave transmitter (10) according to claim 1 or 2, wherein the cavity (12) is defined inside walls (22) surrounding the cavity (12), the receiving parts (34) of the secondary antennas (20) being distributed along said walls (22).
    [0004]
    4. An electromagnetic wave transmitter (10) according to claim 3, wherein the receiving portions (34) of the secondary antennas (20) are distributed randomly along the walls (22) of the cavity (12).
    [0005]
    An electromagnetic wave transmitter (10) according to any one of the preceding claims, wherein each secondary antenna (20) differs from each other secondary antenna (20) for at least one of the following parameters: the secondary electromagnetic wave emitted by the transmitting part (32) of said secondary antenna (20), polarization of said secondary electromagnetic wave, phase of said secondary electromagnetic wave, bandwidth of the secondary antenna (20), and center frequency of the transmitting part (32) of the secondary antenna (20).
    [0006]
    An electromagnetic wave transmitter (10) according to any one of the preceding claims, wherein each secondary antenna comprises a switch (36) for switching the secondary antenna (20) selectively in its on state or in its blocking state. .
    [0007]
    The electromagnetic wave transmitter (10) of claim 6, wherein the switch (36) is an electromechanical switch, or a PIN diode.
    [0008]
    An electromagnetic wave transmitter (10) according to claim 6 or 7, comprising a control module (38) adapted to drive the generation system (16) and to control the switches (36) of the secondary antennas (20). .
    [0009]
    9. A method of emitting a high power electromagnetic wave by an electromagnetic wave transmitter (10) according to any one of the preceding claims, comprising the steps of: providing the transmitter (10), each antenna secondary (20) state in a first state among its blocking and passing states, generation of an excitation signal of the or each primary antenna (14), transmission of the excitation signal to the or each primary antenna (14), transmission, by the or each primary antenna (14), under the effect of the excitation of said primary antenna (14) by the excitation signal which is transmitted to it, of a primary electromagnetic wave, switching in its second state of at least one secondary antenna (20), constructive interaction of the primary electromagnetic wave (s) emitted by the primary antenna (s) (14) at the of the receiving part (34) of the or each secondary antenna (20) which, after s switching, is in its conducting state, to form an electromagnetic wave excitation of said secondary antenna (20), the excitation electromagnetic wave having an amplitude greater than the amplitude of the or each primary electromagnetic wave, and transmitting a secondary electromagnetic wave by the transmitting part (32) of the or each secondary antenna (20) which is in its conducting state, under the effect of the electromagnetic excitation wave of said secondary antenna (20) .
    [0010]
    10. The transmission method according to claim 9, wherein the first state of each secondary antenna (20) is its on state.
    [0011]
    The transmission method according to claim 9 or 10, further comprising a step of selecting a firing direction of the electromagnetic wave transmitter (10), and the switching step is adapted so that, after said switching, any contributing secondary antenna (20) having a positive contribution to the power of an electromagnetic wave emitted by the electromagnetic wave transmitter (10) in the selected firing direction is in its on state, and any another secondary antenna (20) is in its blocking state.
    [0012]
    12. The transmission method according to claim 11, wherein the switching step consists of switching the or each secondary antenna (20) contributing from its blocking state to its on state.
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    法律状态:
    2015-12-31| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-24| PLSC| Search report ready|Effective date: 20160624 |
    2016-12-29| PLFP| Fee payment|Year of fee payment: 3 |
    2018-01-02| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-27| ST| Notification of lapse|Effective date: 20190906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1402979A|FR3030904B1|2014-12-23|2014-12-23|ELECTROMAGNETIC WAVE EMITTER WITH REVERBERING CAVITY AND TRANSMISSION METHOD THEREOF|FR1402979A| FR3030904B1|2014-12-23|2014-12-23|ELECTROMAGNETIC WAVE EMITTER WITH REVERBERING CAVITY AND TRANSMISSION METHOD THEREOF|
    EP15202085.5A| EP3038207B1|2014-12-23|2015-12-22|Electromagnetic wave transmitter with a reverberation chamber and associated transmission method|
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