Abstract: A device for detecting the approach of a portable electronic apparatus and for communicating in the near field with a first antenna for communication at high frequency and an electrical power-supply and control unit having a device for measuring a variation in the amplitude of an electrical parameter representative of detection of the approach of the apparatus. The device includes a second near-field communication antenna housed in a space delimited by the first antenna and associated with a resonance circuit by being connected to the control unit by a switch having a first position for near-field communication where the second antenna is not supplied with power and a second position for approach detection where the second antenna is connected and enters into resonance with the first, active antenna.

Abstract: A radio-transmitting sensor for a vehicle wheel, suitable for measuring at least one physical quantity and for transmitting a radio signal representative of this measured physical quantity. The sensor includes a measurement and transmission circuit, an antenna impedance matching circuit, and an antenna circuit. The sensor includes a sensitivity switch controlled by the measurement and transmission circuit and suitable for switching the antenna circuit according to two modes: a dynamic mode in which the antenna circuit is configured as a magnetic antenna, and in which the sensor transmits said radio signal representative of the measured physical quantity, this signal including transmitted data frames; and a static mode in which the antenna circuit is configured as an electric antenna.

Abstract: A device for high-frequency communication and for the inductive charging of an apparatus, including a charging surface, at least one charging antenna emitting a magnetic field at a low frequency and a layer of ferromagnetic material. The device includes at least one communication antenna and a printed circuit board. The communication antenna is in the form of a coil locally surrounding the layer with an axis of symmetry situated in a plane parallel to the layer. The material of the layer is selected so as to have, at high frequency, an imaginary part with sufficiently high permeability to generate leaks on a surface of the layer extending perpendicular to the layer, while at the same time maintaining, at low frequency, an imaginary part with sufficiently low permeability to allow inductive charging.

Abstract: A device for detecting the approach of a portable electronic apparatus and for communicating in the near field with a first antenna for communication at high frequency and an electrical power-supply and control unit having a device for measuring a variation in the amplitude of an electrical parameter representative of detection of the approach of the apparatus. The device includes a second near-field communication antenna housed in a space delimited by the first antenna and associated with a resonance circuit by being connected to the control unit by a switch having a first position for near-field communication where the second antenna is not supplied with power and a second position for approach detection where the second antenna is connected and enters into resonance with the first, active antenna.

Abstract: A method for charging a power supply battery of a portable device by near-field communication with a base station. The method, implemented by the device, includes, the primary antenna of the base station and the secondary antenna of the device being electromagnetically coupled, the steps of modifying the coupling between the primary antenna of the base station and the secondary antenna of the device, of receiving an authentication request signal sent by the base station subsequent to the step of modifying the coupling, and of charging the power supply battery of the device from the energy of the received authentication request signal.

Abstract: A system for detecting the operation of the motor or engine of a motor vehicle equipped with at least one tire-pressure-monitoring-system transmitter including: a low-frequency stage including a resonant stage connected in series with an antenna, a processing stage, a first switch and a second switch, the first switch being connected to at least two capacitors so as to control the parallel connection of at least one of the capacitors, the second switch being connected to at least two resistors so as to control the parallel connection of at least one of the resistors, outputs of the low-frequency stage being arranged to receive input from the processing stage, in order to transfer the perceived signal to a processor of the signal, which is configured to compare the level of the perceived signal to a preset threshold level.

Abstract: A system for detecting the operation of the motor or engine of a motor vehicle equipped with at least one tire-pressure-monitoring-system transmitter including: a low-frequency stage including a resonant stage connected in series with an antenna, a processing stage, a first switch and a second switch, the first switch being connected to at least two capacitors so as to control the parallel connection of at least one of the capacitors, the second switch being connected to at least two resistors so as to control the parallel connection of at least one of the resistors, outputs of the low-frequency stage being arranged to receive input from the processing stage, in order to transfer the perceived signal to a processor of the signal, which is configured to compare the level of the perceived signal to a preset threshold level.

Abstract: A charging device housed on board a motor vehicle includes at least one “WPC” inductive primary antenna, having a charging frequency, and a second “A4WP” resonant primary antenna, having a resonant frequency at least 1000 times higher than the charging frequency, a ferromagnetic body situated below and joined to the inductive antenna. The method for charging a mobile terminal includes: equipping the ferromagnetic body and inductive antenna beforehand with a system able to move the ferromagnetic body and inductive antenna with respect to the resonant antenna, moving the ferromagnetic body associated with the inductive antenna with respect to the resonant antenna, depending on the resonant frequency of the resonant antenna when the mobile terminal is charged by the resonant antenna, and moving the ferromagnetic body associated with the inductive antenna depending on the charging efficiency of the inductive antenna when the mobile terminal is charged by the inductive antenna.

Abstract: A device for near-field communication with a portable user apparatus, includes: a first communication antenna located on a first carrier; a first device for activating the first antenna located on a second carrier, which is facing the first carrier and mechanically connected to the first carrier by pads. The pads are made of conductive metal and the device also includes: a second antenna, a first winding portion of which is located on one end of the first carrier and a second winding portion of which is located on one end of the second carrier, the two ends facing one another. The first portion and second portion of each winding electrically connected by a pad, the second antenna emitting an electromagnetic field, a main component of which is perpendicular to a main component of the electromagnetic field emitted by the first antenna; and a second device for activating said second antenna.

Abstract: An apparatus for detecting the approach of a mobile device and for near-field communication with the device, includes an NFC antenna under a receiving surface, at least one matching component and an electronic control unit connected by a power supply line and capable of near-field communication with the mobile device. The detection apparatus includes: at least one conductive element; a selector, located on each side of the component and on each side of the conductive element, each having two positions: in a first position the component is connected to the power supply line and the conductive element is not; in a second position the conductive element is connected to the power supply line and the component is not; measuring a variation in an electrical parameter of the conductive element when the two selectors are in the second position to detect the approach of the mobile device toward the receiving surface.

Abstract: A method for determining the relative position of a metal object in relation to a user device and to a transmitter antenna of an inductive charging support when charging the user device. The method includes measuring the quality factor of the transmitter antenna, measuring the quality factor of the receiver antenna, and comparing the measured quality factor of the transmitter antenna with a predetermined quality factor threshold of the transmitter antenna and comparing the measured quality factor of the receiver antenna with a predetermined quality factor threshold of the receiver antenna so as to deduce therefrom the relative position of the metal object in relation to the user device and to the transmitter antenna or the absence of an interfering metal object.

Abstract: A magnetic induction charging device (50) includes an electrical power supply source (60) connected to a main coil (61). The device (50) includes passive resonant circuits (70, 80, 90, 100) of different respective resonant frequencies in a range of predetermined main frequency values. Each passive resonant circuit (70, 80, 90, 100) includes a secondary coil (71, 81, 91, 101). The secondary coils (71, 81, 91, 101) are arranged in respective different zones of the main coil (61). The electrical power supply source (60) is adapted to generate different charging signals of main frequencies in the range of predetermined main frequency values.

Abstract: An apparatus for detecting the approach of a mobile device and for near-field communication with the device, includes an NFC antenna under a receiving surface, at least one matching component and an electronic control unit connected by a power supply line and capable of near-field communication with the mobile device. The detection apparatus includes: at least one conductive element; a selector, located on each side of the component and on each side of the conductive element, each having two positions: in a first position the component is connected to the power supply line and the conductive element is not; in a second position the conductive element is connected to the power supply line and the component is not; measuring a variation in an electrical parameter of the conductive element when the two selectors are in the second position to detect the approach of the mobile device toward the receiving surface.

Abstract: A charging device housed on board a motor vehicle includes at least one “WPC” inductive primary antenna, having a charging frequency, and a second “A4WP” resonant primary antenna, having a resonant frequency at least 1000 times higher than the charging frequency, a ferromagnetic body situated below and joined to the inductive antenna. The method for charging a mobile terminal includes: equipping the ferromagnetic body and inductive antenna beforehand with a system able to move the ferromagnetic body and inductive antenna with respect to the resonant antenna, moving the ferromagnetic body associated with the inductive antenna with respect to the resonant antenna, depending on the resonant frequency of the resonant antenna when the mobile terminal is charged by the resonant antenna, and moving the ferromagnetic body associated with the inductive antenna depending on the charging efficiency of the inductive antenna when the mobile terminal is charged by the inductive antenna.

Abstract: The subject matter of the present invention is a method for charging a power supply battery of a portable device by means of near-field communication with a base station. The method, implemented by the device, comprises, the primary antenna of the base station and the secondary antenna of the device being electromagnetically coupled, the steps of modifying (E1) the coupling between the primary antenna of the base station and the secondary antenna of the device, of receiving (E3) an authentication request signal sent by the base station subsequent to said step of modifying the coupling, and of charging (E4) the power supply battery of the device from the energy of the received authentication request signal.

Abstract: A device for detecting the presence of a parasitic metal object on a reception surface of a device for recharging a user apparatus for an automotive vehicle, the device including an antenna of the emitting coil type and: at least two identical passive detection coils, situated between the emitting coil and the reception surface; a determiner for determining the quality factor across the terminals of the two coils, and of the emitting coil; a controller; a storage device for storing the quality factors at predetermined instances; a calculator for calculating ratios between the stored quality factors, or between values of the quality factors stored at different predetermined instances; a comparator for comparing between the ratios in order to detect the presence of an interfering metal object on the reception surface.

Abstract: A device for two-way detection of the approach of a portable apparatus for near-field hands-free access to a vehicle, said device including a communication antenna having a near-field communication frequency, the device including: a first passive inductive sensor oriented towards the outside of the vehicle, a second passive inductive sensor oriented towards the inside of the vehicle, the two sensors being arranged so as to face one another, separated by a ferrite, and receiving the electromagnetic field emitted by the communication antenna, and being capable of detecting the approach of the portable apparatus; a device for measuring a first voltage across the terminals of the first sensor and a device for measuring a second voltage across the terminals of the second sensor; a device for comparing the first voltage and the second voltage in order to detect the approach of the portable apparatus coming from outside or coming from inside the vehicle.

Abstract: A device for two-way detection of the approach of a portable apparatus for near-field hands-free access to a vehicle, said device including a communication antenna having a near-field communication frequency, the device including: a first passive inductive sensor oriented towards the outside of the vehicle, a second passive inductive sensor oriented towards the inside of the vehicle, the two sensors being arranged so as to face one another, separated by a ferrite, and receiving the electromagnetic field emitted by the communication antenna, and being capable of detecting the approach of the portable apparatus; a device for measuring a first voltage across the terminals of the first sensor and a device for measuring a second voltage across the terminals of the second sensor; a device for comparing the first voltage and the second voltage in order to detect the approach of the portable apparatus coming from outside or coming from inside the vehicle.

Abstract: A device for detecting the presence of a parasitic metal object on a reception surface of a device for recharging a user apparatus for an automotive vehicle, the device including an antenna of the emitting coil type and: at least two identical passive detection coils, situated between the emitting coil and the reception surface; a determiner for determining the quality factor across the terminals of the two coils, and of the emitting coil; a controller; a storage device for storing the quality factors at predetermined instances; a calculator for calculating ratios between the stored quality factors, or between values of the quality factors stored at different predetermined instances; a comparator for comparing between the ratios in order to detect the presence of an interfering metal object on the reception surface.

Abstract: Disclosed is a device (D?) for near-field radiofrequency communication with a portable element, the device including: at least one near-field communication primary antenna (A0) having a predetermined communication frequency (Fc); and a microcontroller (30?) electrically connected to the primary antenna, including a power supply source for the primary antenna and a receiver unit for the data (20?) received by the primary antenna. The communication device further includes: at least one passive relay antenna (A1 . . . A8), juxtaposed with the primary antenna, relay frequencies (F1 . . . F8), lying within a range of values around the predetermined communication frequency (Fc), but different from the predetermined communication frequency (Fc), electrically connected to the data receiver unit. Also included is a unit (C4) for adjusting the relay frequency. The communication device can be used to enlarge the near-field communication surface of the communication device.