Vehicle communication device with passive selection circuit

Abstract

The present invention relates to a vehicle (2) communication device (10) comprising a single communication antenna (11), a matching circuit (12) configured to match the impedance of said communication antenna (11), a high-frequency processing module (13) connected to said matching circuit (12) and configured to process the high-frequency signals received by the antenna (11), and a passive selection circuit (15) connected to the matching circuit (12) and configured to communicate with a near-field communication module (14) which receives signals via the antenna (11), to operate in open circuit when the power of the signals received by the antenna (11) is less than a predetermined power threshold, and to transfer the signals received from the antenna (11) via the matching circuit (12) to the high-frequency processing module (13) when the power of said signals is greater than the predetermined power threshold.Figure for the abbreviation: Fig 2.

Description

Title of the invention: Vehicle communication device with passive selection circuit. Technical field

[0001] The present invention relates to the automotive field and more particularly concerns a high-frequency, near-field signal communication device. Previous technique

[0002] In the field of radio frequency communications, particularly for motor vehicles, several types of radio frequency waves are used for different applications.

[0003] A determining criterion for the type of radio frequency emission used is the distance between the transmitter and the receiver, another is the required quality of signal reception.

[0004] For short-range applications, on the order of a few meters, and where the quality of the information transmitted by the signal is not essential, so-called "high-frequency" radio frequencies are generally used. The high-frequency (HF) range includes transmission frequencies between 3 and 30 megahertz (MHz).

[0005] For very short-range applications, below 10 centimeters, where the quality of the transmitted information is paramount, NFC (Near-Field Communication) technology is often used. The NFC operating frequency is 13.56 megahertz.

[0006] These two types of radio frequency signals imply the use in receivers of different types of electronic circuits for each.

[0007] In certain applications, such as in the automotive sector, it can be advantageous to have a receiving device that combines both types of radio frequency signals. For a portable access device used to unlock a vehicle and activate vehicle functions, it is therefore advantageous to be able to receive high-frequency signals or near-field signals between the user and the vehicle.

[0008] It is then necessary to have the circuits necessary for both types of radio frequency emissions in the same device.

[0009] One solution is to have both circuits, each with its own corresponding antenna, within the device. This solution is not advantageous because space is limited in devices such as electronic car keys or badges, and the presence of two circuits so close together can create cross-interference between them.

[0010] Another solution is to have a single circuit for both types of radio frequency emissions. This solution resolves the problem of space and cross-interference, but the single circuit necessarily degrades the quality of the signal transmitted by both types of radio frequency emissions.

[0011] Finally, one solution consists of having a common section for both types of radio frequency emissions and an intelligent circuit capable of detecting the type of radio frequency emission and activating the corresponding components. This solution also solves the problem of space and cross-interference, but the intelligent circuit requires a permanent power supply, which considerably reduces the lifespan of devices such as electronic keys or vehicle access cards.

[0012] A simple, reliable and effective solution that would at least partially remedy these drawbacks would therefore be advantageous. Description of the invention

[0013] To this end, the invention first relates to a communication device for a motor vehicle, said device comprising a single communication antenna, an adaptation circuit configured to match the impedance of said antenna, a high-frequency processing module connected to said adaptation circuit and configured to process the high-frequency signals received by the antenna and a passive selection circuit, connected to the adaptation circuit and configured to communicate with a near-field communication module so that said near-field communication module receives signals via the antenna, to operate in open circuit when the power of the signals received by the antenna is less than a predetermined power threshold and to transfer the signals received from the antenna via the adaptation circuit to the near-field communication module (14) when the power of said signals is greater than the predetermined power threshold.

[0014] The device according to the invention can thus receive high-frequency and near-field radio frequency signals via a single communication antenna, and adapt the received signals according to their type to redirect them to the appropriate processing module. The passive selection circuit acts as a switch that does not require its own power supply because it closes when the antenna receives near-field signals that generate sufficient voltage in the device's circuits and remains open in all other cases. The circuit according to the invention is therefore energy self-sufficient. This simple circuit is therefore inexpensive and has a limited footprint in the device since it does not require additional components for power supply or active management, such as a microcontroller.

[0015] Advantageously, the passive selection circuit comprises a transistor, said transistor having a collector, a base, and an emitter, said collector being connected to the output of the matching circuit, said emitter being configured to communicate with the near-field communication module, said base being connected to said collector. The operation of the transistor makes it a switch that is open as long as the voltage at the base is insufficient. When the device receives a high-frequency signal, the voltage generated in the circuit is too low for the transistor, and the passive selection circuit is then open. Conversely, when the device receives a near-field signal, the voltage generated in the circuit is then sufficient for the transistor, and the passive selection circuit is then closed, allowing the signal to be sent to the near-field communication module.

[0016] Any type of transistor can be used in the selection circuit according to the invention, for example GaN, FET, MOSFET transistors, whose connections do not have the same name.

[0017] Advantageously, the passive selection circuit comprises a transistor, a diode, and an electrical capacitor, said diode being connected by its input terminal to the output of the matching circuit, said transistor comprising a collector, a base and an emitter, said collector being connected to the output of the matching circuit, said emitter being connected to said capacitor and being configured to communicate with the near-field communication module, said base being connected to the midpoint connecting the output terminal of said diode to said capacitor.

[0018] Preferably, the matching circuit comprises a plurality of electrical capacitors, at least three, including a first capacitor connected in series with the communication antenna, the second and third capacitors connected to the first, the second capacitor connected to the passive selection circuit, the third capacitor connected to the other pole of the antenna, and the high-frequency processing module connected to the junction of the three capacitors. These various capacitors allow the impedance of the matching circuit to be matched according to the type of signal received. The second capacitor only carries an electric current when the passive selection circuit is closed, thus changing the impedance of the matching circuit between the reception of a high-frequency signal and a near-field signal.

[0019] In a first embodiment, the device according to the invention comprises the near-field communication module connected to the passive selection circuit. Thus, the device can be a badge or a key that can receive high-frequency signals and near-field signals while being compact and energy-efficient.

[0020] Preferably, the near-field communication module is connected to the passive selection circuit via a printed circuit board trace.

[0021] In a second embodiment, the device is configured to communicate with a smartphone via a communication link. The device can then assist the smartphone, for example with the high-frequency processing module which is not generally included in current phones.

[0022] Advantageously in this second embodiment, the communication link is wired or wireless.

[0023] The device can thus be connected to the phone by a cable, for example of the USB type.

[0024] The device can also be connected to the telephone by a wireless communication link, for example of the radio frequency wave type.

[0025] According to another aspect, the invention also relates to an assembly comprising a device as presented and a smartphone configured to communicate with said device via a communication link.

[0026] The communication link can be wired or wireless.

[0027] Advantageously, in the whole as presented, the communication module in Near field is implemented in the smartphone. This scenario is the simplest to implement since the majority of current smartphones already include a near field communication module.

[0028] According to another aspect, the invention also relates to a vehicle configured to communicate in high-frequency signals or near-field signals with a device or assembly as presented.

[0029] According to another aspect, the invention also relates to a method for frequency selection between a vehicle as shown and a device or assembly as shown, said vehicle being configured to emit high-frequency signals and near-field signals, said method comprising the steps of:

[0030] - reception, by the communication antenna of the device, of a signal radio frequency,

[0031] - generation, by the communication antenna of the device, of a voltage across the terminals of the adaptation circuit,

[0032] - if the generated voltage is sufficiently high, circuit configuration of Passive selection in a closed circuit

[0033] - sending, via the passive selection circuit, the signal received by the antenna of communication to the near-field communication module,

[0034] - if the generated voltage is too low, the passive selection circuit is configured in open circuit

[0035] - sending the signal received by the communication antenna to the processing module high-frequency.

[0036] According to another aspect, the invention also relates to a method for determining the distance between a vehicle and a device or assembly as shown, said vehicle being configured to emit and receive high-frequency signals and near-field signals, said method comprising the steps of:

[0037] - emission, by the vehicle, of a radio frequency signal,

[0038] - reception, by the device, of the emitted radio frequency signal,

[0039] - generation, by the communication antenna of the device, of a voltage across the terminals of the adaptation circuit,

[0040] - if the generated voltage is sufficiently low, selection circuit configuration passive open circuit

[0041] - sending the signal received by the communication antenna to the processing module high-frequency,

[0042] - processing, by the high-frequency processing module, of the signal sent and emission of a radio frequency signal,

[0043] - reception, by the vehicle, of the radio frequency signal sent and calculation of the distance between the vehicle and the device.

[0044] Advantageously, in the method as presented, the device is configured to communicate with the vehicle on a Bluetooth® Low Energy (BLE) radio frequency link, the vehicle is configured to calculate the distance between the vehicle and the device from the exchanges of Bluetooth® Low Energy (BLE) signals and in which the step of receiving, by the vehicle, the high frequency signal sent and calculating the distance between the vehicle and the device is followed by a step of comparing the distance calculated from the exchanges of high frequency signals and the distance calculated from the exchanges of Bluetooth® Low Energy signals, and a step of validating the measured distance if the two distances are equal. Brief description of the drawings

[0045] Other features and advantages of the invention will become apparent from the following description. This description is purely illustrative and should be read in conjunction with the accompanying drawings, in which:

[0046] [Fig.1] Fig.1 schematically illustrates a vehicle and an assembly comprising a device according to the invention.

[0047] [Fig.2] Fig.2 schematically illustrates a first embodiment of the device according to the invention.

[0048] [Fig.3] Fig.3 schematically illustrates a second embodiment of the device according to the invention connected to a smartphone.

[0049] [Fig.4] Fig.4 illustrates the frequency selection method according to the invention.

[0050] [Fig. 5] [Fig. 4] illustrates the distance measurement confirmation method according to the invention. Description of the implementation methods

[0051] As shown in [Fig.1], the assembly 1 comprising a device 10 according to the invention communicates with a vehicle 2.

[0052] Set 1

[0053] In a first embodiment, shown in Figures 1 and 2, assembly 1 includes a communication device 10.

[0054] In a second embodiment, shown in [Fig.3], the assembly 1 comprises a communication device 10 and a smartphone 20.

[0055] Communication device 10

[0056] As shown in [Fig.2], the device 10 comprises an antenna 11, an adaptation circuit 12, a high-frequency processing module 13, a near-field communication module 14 and a passive selection circuit 15.

[0057] In the embodiment shown in [Fig.3], the device 10 also includes a communication link 16. In this embodiment, the device 10 is an accessory, for example a case or an extension, connected to a smartphone 20 by the communication link 16.

[0058] In another embodiment not shown in the figures, the device 10 is a smartphone 20 comprising the antenna 11, the matching circuit 12, the high-frequency processing module 13, the near-field communication module 14 and a passive selection circuit 15.

[0059] Communication antenna 11

[0060] The antenna 11 is an antenna configured to receive high-frequency radio frequency signals, between 3 MHz and 30 MHz, and near-field signals, at a precise frequency of 13.56 MHz.

[0061] When the antenna 11 receives a high-frequency signal, it generates an electrical voltage at its terminals.

[0062] Adaptation circuit 12

[0063] The adaptation circuit 12 is connected to the antenna 11, the high-frequency processing module 13 and the passive selection circuit 15.

[0064] The adaptation circuit 12 includes a first capacitor 12A, a second capacitor 12B and a third capacitor 12C.

[0065] As shown in [Fig.2], the first capacitor 12A is connected to one pole of the antenna 11. The second capacitor 12B is connected to the first capacitor 12A and to the other pole of the antenna 11.

[0066] The third capacitor 12C is connected to the first capacitor 12A and to the passive selection circuit 15.

[0067] The first capacitor 12A and the second capacitor 12B are configured to form a loop circuit when the antenna 11 receives high-frequency signals at a high distance, and so that the resonant frequency of this circuit is adapted to the frequency of the received high-frequency signal.

[0068] The first capacitor 12A, the second capacitor 12B and the third capacitor 12C are configured to form a loop circuit with the passive selection circuit 15 and the near-field communication module 14 when the antenna 11 receives near-field signals at a short distance, below 10 cm.

[0069] The loop circuit thus formed has a resonance frequency adapted to the frequency of the received NFC signal of 13.56 MHz.

[0070] High-frequency processing module 1 3

[0071] The high-frequency processing module 13 is electrically connected to the adaptation circuit 12.

[0072] The high-frequency processing module 13 is configured to recover voltage variations in the adaptation circuit 12 and to process these variations to extract the high-frequency signal received by the antenna 11 of the device 10.

[0073] High-frequency signal processing is known per se.

[0074] In the embodiment shown in [Fig.3], the high-frequency processing module 13 is connected to the smartphone 20 by the communication link 16.

[0075] The high-frequency processing module 13 can transmit high-frequency signals received by the antenna 11 and processed by the device 10 to the smartphone 20.

[0076] Preferably, the communication link 16 includes a processing module to convert the signals before sending them to the smartphone 20. The processing module is not shown in the figures for clarity.

[0077] Near-field communication module _ 1 4

[0078] In the embodiments shown in the figures, the near-field communication module 14 is integrated into the same electrical circuit as the adaptation circuit 12 via the passive selection circuit 15.

[0079] When the passive selection circuit 15 is closed, the near-field communication module 14 is configured to recover the voltage variations in the adaptation circuit 12 and to process these variations to extract the near-field signal received by the antenna 11 of the device 10.

[0080] Near-field signal processing is known per se.

[0081] In the embodiment shown in [Fig.3], the near-field communication module 14 is connected to the smartphone 20 by the communication link 16.

[0082] The near-field communication module 14 can transmit near-field signals received by the antenna 11 and processed by the device 10 to the smartphone 20.

[0083] Preferably, the communication link 16 includes a processing module to convert the signals before sending them to the smartphone 20. The processing module is not shown in the figures for clarity.

[0084] Passive selection circuit 1 5

[0085] The passive selection circuit 15 is electrically connected to the adaptation circuit 12 and to the near-field communication module 14.

[0086] The passive selection circuit 15 is configured to act as an open switch when the signal received by the device 10 is a high-frequency signal whose source is at a distance greater than 10 cm from the device 10 and to act as a closed switch when the signal received by the device 10 is a near-field communication signal, i.e. a 13.56 MHz signal whose source is at a distance less than 10 cm.

[0087] As shown in [Fig.2], the passive selection circuit 15 includes a transistor 151, a diode 152, and a capacitor 153.

[0088] The transistor 151 is advantageously a bipolar transistor, comprising a collector C, a base B and an emitter E.

[0089] Transistor 151 is configured to allow current to flow between collector C and emitter E only if sufficient current is supplied to base B.

[0090] The collector C is connected to the matching circuit 12, the emitter E is connected to the input of the near-field communication module 14 and the base E is connected to the midpoint connecting the output terminal of the diode 152 to the capacitor 153.

[0091] Diode 152 includes an input terminal and an output terminal. An electric current can flow through diode 152 from its input terminal to its output terminal, but the reverse is impossible.

[0092] The input terminal of diode 152 is connected to the collector C of transistor 151.

[0093] The output terminal of diode 152 is connected to the base E of transistor 151.

[0094] Diode 152 only allows electric current to flow from its input terminal to its output terminal, ensuring that current flows from the matching circuit 12 to the base B of transistor 151.

[0095] The capacitor 153 is connected to the base B and to the emitter E of the transistor 151.

[0096] Capacitor 153 allows the voltage at the base B of the transistor to be adjusted. 151.

[0097] Communication link 16

[0098] In the embodiment shown in [Fig.3], the device 10 includes a communication link 16 which allows communication with a smartphone 20.

[0099] The communication link 16 can be wired, for example via a USB connection, or wireless, for example via BLE (Bluetooth® Low Energy).

[0100] The communication link 16 allows the high-frequency processing module 13 and the near-field communication module 14 to communicate directly with the smartphone 20 without going through the IL antenna

[0101] In the case where the communication link 16 is a wireless communication link, the device 10 can communicate directly with the vehicle 2 via the communication link 16.

[0102] In particular, if the communication link 16 is of the Bluetooth® Low Energy type, the device 10 can communicate with the vehicle 2 in Bluetooth® Low Energy.

[0103] Smartphone 20

[0104] Smartphone 20 is the smartphone of the user of vehicle 2.

[0105] In the embodiment shown in [Fig.3], the smartphone 20 is connected to the device 10 by the communication link 16.

[0106] In this embodiment, the device 10 is an accessory of the smartphone 20, and can be contained in an external case into which the smartphone 20 is inserted or in an extension connected to the smartphone 20.

[0107] The smartphone 20 can communicate with the vehicle 2 via radio frequency signals.

[0108] Vehicle 2

[0109] Vehicle 2 includes means for transmitting radio frequency signals, including high frequency signals and near-field communication signals.

[0110] Advantageously, vehicle 2 also includes at least one means for transmitting and receiving in BLE (Bluetooth® Low Energy) [YES] Example of implementation

[0112] First embodiment

[0113] As shown in Figures 1 and 2, assembly 1 contains only device 10 in the first embodiment.

[0114] In a preliminary step, vehicle 2 emits a radio frequency signal.

[0115] In a first step El, the device 10 receives the radio frequency signal emitted by the vehicle 2.

[0116] The device 10 of assembly 1 receives the radio frequency signal when said radio frequency signal reaches the antenna 11 of the device 10.

[0117] In a second step E2, the antenna 11 generates an oscillating voltage following the received radio frequency signal.

[0118] This voltage causes a flow of electrical charges across the terminals of antenna 11.

[0119] The amplitude of the generated voltage depends on the power of the received radio frequency signal. This power decreases with the distance between vehicle 2 and device 10.

[0120] If the radio frequency signal emitted by vehicle 2 is of the near-field communication type, the device 10 only captures this signal if it is very close to vehicle 2, less than 10 cm away.

[0121] The radio frequency signal received by the device 10 is then very powerful and the amplitude of the generated voltage is significant.

[0122] Consequently, the voltage at the base B of transistor 151 of the passive selection circuit 15 is significant and allows transistor 151 to behave as a closed switch, thus passing current to the near-field communication module 14 in a step E3.

[0123] In a step E4, the near-field communication module 14 receives the signal and processes it.

[0124] Capacitors 12A, 12B, and 12C have capacitances adapted to the expected frequency of the near-field communication signal of 13.56 MHz. The matching circuit 12 thus allows the voltage oscillation to be adapted in one step into a signal usable by the near-field communication module 14.

[0125] If the radio frequency signal emitted by vehicle 2 is of the high frequency communication type, the device 10 can capture this signal at a greater distance from vehicle 2, on the order of a few meters.

[0126] The radio frequency signal received by the device 10 is then less powerful and the amplitude of the generated voltage is less important.

[0127] Consequently, the voltage at base B of transistor 151 of the passive selection circuit 15 is no longer sufficient and transistor 151 behaves like an open switch, preventing current from reaching the near-field communication module 14.

[0128] The capacitor 12C of the adaptation circuit 12 is no longer powered and the signal is then captured by the high-frequency processing module 13 in a step E3*.

[0129] In a step E4*, the high-frequency processing module 13 receives the signal and processes it.

[0130] The adaptation circuit 12, with capacitors 12A, 12B, thus allows the voltage oscillation to be adapted in one step into a signal usable by the high-frequency processing module 13.

[0131] Second embodiment

[0132] In the second embodiment shown in [Fig.3], in which the device 10 is an accessory connected to a smartphone 20 by the communication link 16, the process takes place in the same way.

[0133] This embodiment is therefore advantageous for smartphones 20 which do not include a high-frequency processing module 13.

[0134] This embodiment thus allows assembly 1 to implement a method for determining the distance between vehicle 2 and assembly 1 comprising device 10 and a smartphone 20.

[0135] In a step Fl, vehicle 2 emits high-frequency signals.

[0136] In a step F2, the device 10 receives the high-frequency signals sent by vehicle 2.

[0137] Due to the high frequency, the voltage that these signals received by the antenna 11 generate is not sufficient for the passive selection circuit 15 to close, so the high frequency signals are transmitted to the high-frequency processing module 13 via the adaptation circuit 12 in a step F3.

[0138] The high-frequency processing module 13 receives the signals sent by the vehicle 2 in a step F4 and detects that the user wearing the assembly 1 is located in a close area around the vehicle 2.

[0139] In a step F5, the high-frequency processing module 13 generates a response signal which is sent to the smartphone 20 via the communication link 16, and which is then sent to the vehicle 2 by the smartphone 20 in a step F6.

[0140] Alternatively, when the communication link 16 is a wireless link, in particular a Bluetooth® Low Energy link, the device 10 can directly send the signal to the vehicle 2 via the wireless communication link 16.

[0141] The signal sent to the vehicle 2 by the smartphone 20 is preferably a Bluetooth® Low Energy type signal.

[0142] In a step F7, vehicle 2 receives the response signal and calculates the distance between vehicle 2 and the user wearing assembly 1.

[0143] The calculation of the distance can be carried out from the RSSI (“Received Signal Strength Indicator”), i.e. the power of the received signal in the case of Bluetooth® Low Energy signals, or by a measurement of the amplitude of the received signal for high-frequency signals.

[0144] This distance calculation can be used to activate vehicle 2 approach functions, such as unlocking the doors or turning on the air conditioning, when the user gets close enough to vehicle 2.

[0145] This method of determining distance via high-frequency signals makes it possible to limit the risks associated with the placement of the smartphone 20 in relation to the user, which can lead to interference with the signals by organic tissues or by metallic elements.

[0146] This method of determining distance via high-frequency signals can be carried out in addition to a method of determining distance carried out by the smartphone 20 itself via Bluetooth® Low Energy type signals to confirm the distance determined.

[0147] Indeed, Bluetooth® Low Energy type signals are more likely to be disrupted by human tissue and metallic elements, which can distort the distance measurement if the smartphone 20 is carried for example in a back pocket of the user's trousers or near metallic elements such as keys.

[0148] The antenna 11 of the device 10 can also capture near-field signals when the user is sufficiently close to the vehicle 2 and provide redundancy with the antenna of the smartphone 20 in the event that the near-field signals are blocked by a part of the user's body or by metallic elements.

Claims

Demands

1. A communication device (10) for a motor vehicle (2), said device (10) comprising a single communication antenna (11), a matching circuit (12) configured to match the impedance of said communication antenna (11), a high-frequency processing module (13) connected to said matching circuit (12) and configured to process the high-frequency signals received by the antenna (11), and a passive selection circuit (15) connected to the matching circuit (12) and configured to communicate with a near-field communication module (14) so ​​that said near-field communication module (14) receives signals via the antenna (11),to operate in open circuit when the power of the signals received by the antenna (11) is less than a predetermined power threshold and to transfer the signals received from the antenna (11) via the matching circuit (12) to the near-field communication module (14) when the power of said signals is greater than the predetermined power threshold.

2. Device (10) according to claim 1, wherein the passive selection circuit (15) comprises a transistor (151), said transistor (151) comprising a collector (C), a base (B) and an emitter (E), said collector (C) being connected to the output of the matching circuit (12), said emitter (E) being configured to communicate with the near-field communication module (14), said base (B) being connected to said collector (C).

3. Device (10) according to the preceding claim, wherein the matching circuit (12) comprises a plurality of electrical capacitors (12A, 12B, 12C), at least three, of which a first capacitor (12A) is connected in series with one pole of the antenna (11), the second capacitor (12B) and the third capacitor (12C) are connected with the first capacitor (12A), the second capacitor (12B) is connected with the passive selection circuit (15), the third capacitor (12C) is connected with another pole of the antenna (11) and the high-frequency processing module (13) is connected with the junction of the three capacitors (12A, 12B, 12C).

4. Device (10) according to any one of the preceding claims, said device (10) comprising the module of near-field communication (14) connected to the passive selection circuit (15).

5. Device (10) according to the preceding claim, said device (10) being configured to communicate with a smartphone (20) via a communication link (16).

6. Device (10) according to the preceding claim, wherein the communication link (16) is wired or wireless.

7. Assembly (1) comprising a device (10) according to any one of the preceding claims and a smartphone (20) configured to communicate with said device (10) via a communication link (16).

8. Assembly (1) according to the preceding claim, wherein the near-field communication module (14) is implemented in the smartphone (20).

9. Vehicle (2) configured to communicate in high-frequency signals or near-field signals with a device (10) according to any one of claims 1 to 6 or with an assembly (1) according to any one of claims 6 or 7.

10. A method for selecting frequency between a vehicle and a communication device (10) according to any one of claims 1 to 6, said transmitter being configured to transmit high-frequency signals and near-field signals, said method comprising the steps of: - receiving (E1), by the antenna (11) of the device (10), a radio frequency signal, - generating (E2), by the antenna (11) of the device (10), a voltage across the terminals of the matching circuit (12), - if the generated voltage is sufficiently high, configuring (E3) the passive selection circuit (15) in closed circuit, - sending (E4), via the passive selection circuit (15) and the matching circuit (12), the signal received by the antenna (11) to the near-field communication module (14), - if the generated voltage is too low, configuring (E3*) the passive selection circuit (15) in open circuit, - sending (E4*), via the adaptation circuit (12),of the signal received by the antenna (11) to the high-frequency processing module (13).

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