Abstract: An integrated circuit is one that performs radio communication with an external apparatus and includes a processing circuit, a diagnostic circuit configured to perform a diagnosis of the processing circuit according to a plurality of diagnostic items and a charging circuit configured to store charge for causing the diagnostic circuit to operate, during a period of performing radio communication, in which the diagnostic circuit is configured to perform the diagnosis on a first subset of the plurality of diagnostic items by using the charge stored in the charging circuit during a first period of not performing radio communication.

Abstract: A near field communication device includes an amplifier that amplifies a signal received through an antenna and outputs the signal as an amplified receive signal, a gain control block that adjusts a gain of the amplifier based on a level of a noise included in the amplified receive signal during a noise reception sequence, and a data determination block that determines a noise threshold voltage based on the level of the noise of the amplified receive signal after the gain is completely adjusted and determines data from the amplified receive signal by using the noise threshold voltage.

Abstract: Systems and methods for location estimation and tracking for passive RFID and wireless sensor networks in accordance with embodiments of the invention are disclosed. In one embodiment, a process for obtaining location information using an RFID reader system includes transmitting a combined interrogation and ranging signal from a plurality of antennas, where the ranging signal is a pseudorandom signal, receiving a backscattered return signal from an RFID tag at one or more receive antennas, extracting an information signal from the return signal and decoding the information signal to obtain RFID tag data, extracting a received ranging signal from the return signal, and estimating a range to the RFID tag based upon correlation between the ranging signal and the received ranging signal.

Abstract: Methods and apparatuses are provided using RFID devices to assist in determining an open status of a container. For example, a first RFID tag is fixed to a first portion of the container and a second RFID tag is fixed to a second portion of the container. Upon a user action to at least partially open the container, the first and second portions will move relative to each other, such that one or more of the RFID tags will no longer be readable by the RFID-tag reader or will now be readable by the reader. The reading or cessation of reading of one or more RFID tags indicates at least one open status of the container. In some embodiments, the open status is at least one of an unsealing confirmation, an open motion initiation status, an open motion confirmation, a partial open status and a fully open status.

Abstract: A method, device, and system for a user to place an order with a service provider using a Bluetooth-enabled apparatus that connects to a Bluetooth-enabled phone. Upon pressing a button on the Bluetooth-enabled apparatus, the apparatus and the phone automatically pair, and the phone automatically dials a preset number and sends a preset message to the service provider. A confirmation can be sent to the user. An order can also be placed automatically when the lid of the apparatus is opened. The apparatus can include indicator lights to signal errors and/or the status of the order.

Abstract: Some demonstrative embodiments include apparatuses, systems and/or methods of detecting an activity of a wireless communication device. For example, a Near Field Communication (NFC) device may include a transmitter to transmit information to a polling device by modulating a carrier signal emitted by the polling device; a sensor to sense a plurality of sensed modulation levels of the carrier signal; and a controller to detect an activity of an other NFC device based on the sensed modulation levels.

Abstract: A carrier using method includes: receiving, by the user equipment, configuration information that is of a secondary component carrier and sent by the base station, and configuring the secondary component carrier according to the configuration information; after receiving a first activation command sent by the base station, activating the configured secondary component carrier to obtain an activated secondary component carrier, and controlling to enable a radio frequency RF module of the user equipment; receiving use right control information that is of the activated secondary component carrier and sent by the base station, and determining an available time of the activated secondary component carrier according to the use right control information; performing an operation related to the activated secondary component carrier within the available time; and stopping performing the operation related to the activated secondary component carrier after the available time is reached.

Abstract: Disclosed herein is a mobile Radio Frequency Identification (RFID) reader: including a plate panel for recognition of RFID tag information configured to include an antenna and a recognition surface; a grip configured such that the central axis of thereof is included in a plane to which the plate panel for the recognition of RFID tag information belongs and the grip is substantially parallel to the height direction of the plate panel for recognition of RFID tag information and is spaced apart from the plate panel for recognition of RFID tag information; and a coupling portion configured such that the coupling portion is substantially parallel to the horizontal direction of the recognition surface of the plate panel for recognition of RFID tag information and both ends of the coupling portion are coupled to the plate panel for recognition of RFID tag information and the grip, respectively.

Abstract: A feeding module for an address book includes a processor and a memory. The processor receives at least one search parameter. The processor accesses information sources to find existing entities and expecting entities that match the at least one search parameter. The memory stores the found existing entities and the found expecting entities. The feeding module forwards the found existing entities and the found expecting entities to an address book to be displayed.

Abstract: An internet of things (IoT) edge appliance is configured to perform a method that includes receiving a configuration signal to configure the IoT edge appliance to communicate with at least one of a first device on the cloud network or a second device on the industrial process control and automation system network. The method also includes configuring a communication link with a cloud network and an industrial process control and automation system network. The method further includes communicating data with the at least one of the first device on the cloud network or the second device on the industrial process control and automation system network.

Abstract: The present invention provides a method of operating a bi-directional communication system between a plurality of communication devices, which comprises at least one communication controller and a plurality of nodes including a first node. The method includes periodically broadcasting a beacon signal from said communication controller at a broadcast interval via a channel of a first host. The beacon signal contains a first address of the communication controller. The method further includes periodically scanning the beacon signal on the first host by the first node. Upon detecting of the beacon signal by the first node, the first node transmits an identification payload to the communication controller. Upon receipt of the identification payload by the communication controller, an acknowledgement signal is transmitted to the first node.

Abstract: Passive wireless transponders can perform transponder-to-transponder communication when illuminated by an interrogation carrier wave. The transponder-to-transponder communication permits each transponder to determine the identity of “other” proximately transponders. The transponder-to-transponder communication optionally permits each transponder to identify a “nearest neighbor” using one or more backscatter signal properties such as received signal strength or time-of-flight. Using this information and one or more externally supplied or internally stored instruction sets transponders can provide neighboring transponder data to an interrogator. Using this “neighbor” data, the interrogator can provide a system user with data indicative of the relative locations of a plurality of tags arranged in a one or two dimensional matrix.

Abstract: An information processing apparatus includes processing circuits that have respective identification information and that perform processing corresponding to a request from another information processing apparatus, and a reporting circuit that stores the respective identification information of the processing circuits and, instead of the processing circuits, that reports the identification information to the another information processing apparatus in response to a request for reporting the identification information, the request being issued from the another information processing apparatus.

Abstract: A radio frequency identification (RFID) tag reading system and method accurately and rapidly determine, in real-time, true bearings of RFID tags associated with items in a controlled area. Primary transmit and receive beams are steered over the area, and multiple secondary receive beams are substantially simultaneously steered to a plurality of bearings in the area. The highest signal strength of secondary receive signals from the secondary receive beams determines an approximate tag bearing of each tag. Two secondary receive beams at opposite sides of the approximate tag bearing in elevation are selected to obtain a pair of elevation offset signals, and two secondary receive beams at opposite sides of the approximate tag bearing in azimuth are selected to obtain a pair of azimuth offset signals. The elevation offset signals and the azimuth offset signals are processed to determine a true bearing for each tag in real-time.

Abstract: A device specifies status data that should be uploaded to a management system using condition data and calculation logic, and uploads only status data that should be uploaded.

Abstract: Provided is a method of preventing collision between a plurality of RFID tags by an RFID reader. An anti-collision method by a tag reader apparatus in an RFID system including a plurality of RFID tags, includes changing a length of a collision recovery slot in the collision recovery slot which successfully identifies a plurality of tags even though at least two tags simultaneously replied in one slot to cause collision so that data transmission of at least one identified tag is achieved.

Abstract: A user equipment (UE) includes a memory element and a processor. The memory element is configured to store a plurality of head-related transfer functions. The processor is configured to receive an audio signal. The audio signal includes a plurality of ambisonic signals. The processor is also configured to identify an orientation of the UE based on physical properties of the UE. The processor is also configured to rotate the plurality of ambisonic signals based on the orientation of the UE. The processor is also configured to filter the plurality of ambisonic signals using the plurality of head-related transfer functions to form speaker signals. The processor is also configured to output the speaker signals.

Abstract: An image forming apparatus including a wireless tag reader is described. The wireless tag reader is configured to be located in a first position to read wireless tags associated with consumables when the consumables are inserted into, stationary in, or removed from the image forming apparatus, and in a second position to read wireless tags outside of the image forming apparatus.

Abstract: A plasma arc torch is provided for use in a plasma cutting system. The plasma arc torch includes a torch body for conducting electrical current. The torch body includes a torch tip configured to pass the electrical current to at least one consumable component connected to the tip. The plasma arc torch also includes at least one antenna positioned relative to the torch tip. The antenna is used to wirelessly detect the presence of the at least one consumable component. The plasma arc torch further includes a detection circuit configured to permit passing of the electrical current from the torch tip to the at least one consumable component based on at least the wireless detection.

Abstract: Systems and methods are disclosed for efficient signaling between devices. A leaf device initiates association with chirp signals to relay devices. Relay devices respond with keep alive signals. The leaf device selects a relay (from those that responded) and associates with it. Alternatively, selection of the relay may be offloaded to a base station. In another embodiment, an available relay device transmits a discovery broadcast to leaf devices. A leaf device responds with a chirp signal to the relay and association occurs. After association, the leaf device periodically sends a chirp signal and the relay responds with a keep alive signal. If either device fails to send its signal, link breakage is assumed. The leaf device reverts to uplink communication with a base station while searching for another relay. Downlink paging may be synchronized with the chirp/keep alive signaling. Other aspects, embodiments, and features are also claimed and described.

Abstract: A drive control system has: a plurality of drive control devices; and an upper-level control device to which each of the drive control devices is connected in parallel with each other via a common signal line. The upper-level control device transmits a common information acquirement request signal to each of the drive control devices. Upon receiving the information acquirement request signal, each of the drive control devices determines transmission start timing for a response signal based on transmission sequence information indicating its transmission sequence and a length of the response signal such that the response signal does not temporally overlap with a response signal being transmitted from another drive control device to the upper-level control device. Each of the drive control devices transmits the response signal to the upper-level control device via the signal line at its transmission starting timing.

Abstract: An approach for facilitating secured use of short-range wireless tokens is disclosed. In some implementations, a short-range wireless token may be wirelessly powered based on the short-range wireless token being within a powering range of an electromagnetic field of a user device. The short-range wireless token may be configured to generate output signals while being powered. The output signals of the short-range wireless token may be disabled while the short-range wireless token continues to be powered by the electromagnetic field based on a predetermined condition determined by the short-range wireless token. The output signals of the short-range wireless token may be re-enabled based on a discontinuing of the powering of the short-range wireless token by the electromagnetic field and then a resuming of the powering of the short-range wireless token by the electromagnetic field.

Abstract: This disclosure describes a non-dissipative snubber circuit configured to boost a voltage applied to a load after the load's impedance rises rapidly. The voltage boost can thereby cause more rapid current ramping after a decrease in power delivery to the load which results from the load impedance rise. In particular, the snubber can comprise a combination of a unidirectional switch, a voltage multiplier, and a current limiter. In some cases, these components can be a diode, voltage doubler, and an inductor, respectively.

Abstract: Systems and methods for operating an RFID transponder (102). The methods involve: performing energy harvesting operations by a voltage scavenging device (130) of the RFID transponder to collect energy from an RF field, magnetic field, heat, light or movement of the RFID transponder; increasing or decreasing, by a voltage converter of the RFID transponder, a voltage level of a signal received from the voltage scavenging device to a sub-threshold voltage level that is at least one order of magnitude below a normal operating range for the RFID transponder; and supplying an operating voltage at the sub-threshold voltage level to at least a transceiver circuit (124) of the RFID transponder.

Abstract: A method is provided for remotely controlling a supply of power to a plurality of electrical appliances. In response to attaching a plug of a first electrical appliance of a plurality of electrical appliances to a first socket of the one or more sockets connected to a main power supply, a control system activates a transceiver at a first of the first socket and the plug; stimulates, via the transceiver, a tag at a second of the first socket and the plug to determine a unique identifier of the tag. The control system receives the unique identifier of the tag from the transceiver and uses the unique identifier to activate/deactivate the transceiver which connects/disconnects the main power supply from the first electrical appliance.

Abstract: A system and computer program product are provided for remotely controlling a supply of power to a plurality of electrical appliances. In response to attaching a plug of a first electrical appliance of a plurality of electrical appliances to a first socket of the one or more sockets connected to a main power supply, a control system activates a transceiver at a first of the first socket and the plug; stimulates, via the transceiver, a tag at a second of the first socket and the plug to determine a unique identifier of the tag. The control system receives the unique identifier of the tag from the transceiver and uses the unique identifier to activate/deactivate the transceiver which connects/disconnects the main power supply from the first electrical appliance.

Abstract: Devices and methods of disrupting data transfer between an RFID interrogation device (50, 50?) and an RFID data storage device (30, 30?) to be protected, are provided. An example of an embodiment of an RFID signal disruptor device includes a container (41, 141) and an RFID signal disruptor circuit (151, 161, 161?, 171, 171?, 271, 271?) configured to substantially disrupt the signal provided by the RFID interrogation device (50, 50?) when the RFID signal disruptor device is positioned to protect the RFID data storage device (30, 30?).

Abstract: A network device search system includes an information processing terminal and a network device. The information processing terminal includes a search request unit configured to transmit a search request signal via a network; and a device information display unit configured to display, if notification information is attached to a received response signal, unique information for the network device included in the response signal in association with the notification information. The network device includes an input screen display unit configured to display an input screen in response to reception of the search request signal; and a search request response unit configured to return, when the notification information is input through the input screen, the response signal including the unique information for the network device by attaching the notification information thereto.

Abstract: An unpowered signal receiver and a method for signal reception detects and responds to very weak signals using pyroelectric devices as impedance transformers and/or demodulators. In some embodiments, surface acoustic wave devices (SAW) are also used. Illustrative embodiments include satellite and long distance terrestrial communications applications.

Abstract: The present invention provides a transceiver for a radio frequency identification (RFID) reader. The transceiver includes an RF front end, a transmitting component, a receiving component, a power divider and a micro control unit (MCU). The power divider has three terminals. The first terminal of the power divider is connected to the transmitting component. The second terminal of the power divider is connected to the receiving component. The third terminal is connected to the RF front end. Moreover, the MCU is connected to the transmitting component and the receiving component, and generates a transmitted signal and receives a retrieved data. According to the present invention, the transceiver further includes an RF switch, a matching circuit and a receiving circuit.

Abstract: A method of adding TTO functionality to an RTF RFID air protocol, such as ISO/IEC 18000-63 and EPC C1G2 protocol, Chinese GB/T 29768-2013. The starting wait state is changed after power-up of the RTF protocol to a TTO state where the tag automatically transmits an ID or an ID plus additional data at intervals to a reader while still waiting for possible RTF commands. A new command is added that enables the reader to obtain a handle from the tag directly from the TTO state to access the tag in an identical manner to the RTF access. The TTO functionality is as defined by the ISO/IEC 1800-64 protocol or IP-X protocol.

Abstract: A method may include generating for transmission a repeating sequence of N constant-frequency pulses of width t seconds at interpulse intervals of T seconds, with each pulse in the sequence having a particular constant phase according to a quadratic phase sequence, which phase is applied to each pulse in a first sense of modulation. The method may further include modulating the phase of echo energy received from one or more objects reflecting the transmitted repeating sequence of N constant-frequency pulses with a second sense of modulation opposite to the first sense of modulation. The method may further include producing from the modulated received echo energy N unique and discrete frequency translations of the received echo energy as a function of range r of the reflecting objects, of magnitude equal to multiples of 1/NT Hz, which may preserve the spectrum of the received echo energy, forming in combination a composite signal frequency spectrum.

Abstract: An electrical outlet, an electrical outlet cover for use with an electrical outlet and methods of identifying a grid connection point for bill processing of a charging event and managing energy services are disclosed. The electrical outlet cover includes a cover unit having a receptacle opening configured to align with a receptacle of the electric outlet and an identification unit configured to present a unique identification that is associated with the electrical outlet. In an embodiment, a method includes establishing an identity tag at a grid connection point (GCP) that unique identifies the GCP, receiving identity tag information to uniquely identify the GCP and monitoring charge event information indicating attributes of the charging event. The method further includes associating the charge event information with the identity tag information, as associated information; and sending the associated information for reconciliation of billing accounts associated with the GCP and the mobile charging device.

Abstract: A method for evaluating, by an radio frequency identification reader (1), a data stream signal (DS) in respect of data and/or collision, comprises comparing the data stream signal (DS) with at least one threshold level, particularly a data bit level and/or a collision level, and evaluating the results of the comparison, wherein both the threshold level and its adaptation speed (?(n)) are adapted in dependence of the course of the data stream signal (DS) and/or the course of said threshold level.

Abstract: The present invention relates to a radio frequency identification (RFID) tagging device and method, using which a RFID tag which is designed to attach an object is first linking the object information of an object and an RFID tag with programmed memory data or UID (unique identification) code, being scanned and detected in view of optimizing the RFID tag's signal strength and its effective read rate as well so as to determine a position for the RFID tag to attach thereat while allowing the detection to the RFID tag to be prevented from being adversely affected by metals or magnetic materials, and promising to achieve the optimization of the RFID system applications.

Abstract: A method for data communication between a base station and at least one transponder by a high-frequency electromagnetic carrier signal is disclosed, onto which information packets are modulated, whereby each information packet has a header section, a middle section, and an end section and whereby the middle section has a data field for the transmission of data and/or address information and a protection field placed thereafter for the correction of errors in the transmission of the data and/or address information, whereby after the data field the base station inserts at least one control field, by which the protection field following the inserted control field can be changed in such a way that the duration of an information packet is set variably. The invention relates further to a base station for carrying out this method, to a data communication system containing a base station and at least one transponder in communicative wireless contact with the base station.

Abstract: A method for configuring and operating a read/write unit connected to an industrial control device in a system including multiple transponders having unique identification numbers, the read/write unit. During a recognition phase, a plurality of the transponders are detected, at least two of the transponders are repeatedly detected, and during each detection, the unique identification number of each detected transponder and a number of features relating to each detection of that transponder are registered. During an evaluation phase, the registered features are evaluated statistically for each detected transponder, statistical variables are determined for each detected transponder, and the statistical variables are respectively filtered using filter criteria.

Abstract: The invention relates to an RFID transponder device configured for responding to a request of an RFID reader device, by sending a response (UID) comprising information for encoding a feature set of the RFID transponder device. The invention further relates to an RFID reader device and to an RFID system comprising such RFID transponder device and such RFID reader device. The invention also relates to various methods. The invention provides an RFID system, which is more flexible towards introducing new RFID transponder devices that are newly introduced to the market. The invention enables the introduction of such new devices using a sub-set of a prior defined feature set without requiring updating of the look-up tables of the RFID reader devices that are already on the market. This is achieved by directly encoding the feature set of the RFID transponder device in the response, such as in a unique identifier of the device.

Abstract: A method for handling collision in an identification system where the identification system includes a reader, a first transponder and a second transponder. The method involves the reader transmitting an initialization command to the first transponder and to the second transponder; upon receiving the initialization command, the first transponder and the second transponder enter into a muted state where the first transponder and the second transponder do not respond to commands from the reader; in a randomly determined first start time slot the first transponder enters into an un-muted state and the first transponder remains in the un-muted state until the reader sends a mute command to the first transponder; in a randomly determined second start time slot the second transponder enters into an un-muted state and the second transponder remains in the un-muted state until the reader sends a mute command to the second transponder.

Abstract: The present application relates to a transceiver for use in a communications system that uses magnetic field induction to transmit data, the transceiver having an amplifier for driving an antenna, the amplifier forming, with a capacitance and a resistance connected in parallel with the antenna, a parallel resonant circuit. The resistance value of the resistance is adjustable, to permit adjustment of the loaded quality factor of the parallel resonant circuit. The transceiver includes a processing unit configured to determine the signal to noise ratio (SNR) of a signal received by the transceiver, and based on this SNR select a modulation scheme to apply to a data signal to be transmitted by the transceiver. The value of the resistance is adjusted to a level at which the loaded quality factor of the parallel resonant circuit is able to support the bandwidth and data rate required by the selected modulation scheme.

Abstract: A method may include generating for transmission a repeating sequence of N constant-frequency pulses of width t seconds at interpulse intervals of T seconds, with each pulse in the sequence having a particular constant phase according to a quadratic phase sequence, which phase is applied to each pulse in a first sense of modulation. The method may further include modulating the phase of echo energy received from one or more objects reflecting the transmitted repeating sequence of N constant-frequency pulses with a second sense of modulation opposite to the first sense of modulation. The method may further include producing from the modulated received echo energy N unique and discrete frequency translations of the received echo energy as a function of range r of the reflecting objects, of magnitude equal to multiples of 1/NT Hz, which may preserve the spectrum of the received echo energy, forming in combination a composite signal frequency spectrum.

Abstract: The claimed subject matter provides a system and/or a method that facilitates configuring at least one radio frequency identification (RFID) device. An RFID network can include at least one device associated with a device group, wherein the device group corresponds to a characteristic. An organizational manager can uniformly configure the at least one device based at least in part upon membership of the device group.

Abstract: A display driving integrated circuit operates as both a radio-frequency identification (RFID) reader and a display driver. The display driving integrated circuit operates as the RFID reader by supplying power to an RFID tag, verifying the RFID tag according to communication between the RFID tag and the processor to produce verification data, transferring the verification data from the processor to the RFID tag, and transmitting some of the verification data to the display unit. It operates as a display driver by processing data received from the processor and transferring the processed data to the display unit. The display driving integrated circuit implements functions for the RFID reader and the display unit driver using one or more shared elements selected from a timer, a clock signal generator, a cyclic redundancy check calculator, and a data interface.

Abstract: A device includes a processor having a standby state, a control unit coupled to the processor to receive wireless identification information, and a storage device to store a processor wake policy. The control unit applies the policy to received wireless identification information to wake the processor.

Abstract: A tag includes an integrated circuit thereon, including memory, antenna means for RF transmission of data acquired by the integrated circuit, a sensor sensing environmental conditions to which the sensor is subjected, the sensor providing signals based on the environmental conditions to the integrated circuit, a thermistor device of increasing the accuracy of the tag by confining on-board calculation data to a resistance domain and leaving conversion of the data to a temperature domain for an external device once the data is retrieved from the tag's memory.

Abstract: The subject disclosure provides a system and method for remote monitoring of a subject wearing a sports helmet. In one aspect, the system includes a safety helmet and a sensor integrated with the helmet for continuously gathering head acceleration force data, the head acceleration force data associated with the head movements of a subject. The system also includes a wireless transceiver coupled to the sensor for transmitting the head acceleration force data and a mobile device for receiving the head acceleration force data from the wireless transceiver. The system further includes a database engine for displaying the head acceleration force data to a user.

Abstract: A method is disclosed for controlling operational parameters of a wireless reader device and/or one or more other devices based on proximity of the wireless reader device to a wireless electronic circuit. At a first location, the wireless reader device and/or the one or more other devices are controlled based on a first operational parameter. At a second location, interrogation signals are transmitted from the wireless reader device, and response signals are received at the wireless reader device. The response signals are transmitted from the wireless electronic circuit in response to receiving the interrogation signals from the wireless reader device. The response signals convey a control parameter to the wireless reader device that is associated with a second operational parameter. Thereafter, the wireless reader device and/or the one or more other devices are controlled based on the second operational parameter.

Abstract: The invention relates to a method of operating a RFID system comprising at least one reader (1) and a plurality of wireless data carriers (2), each of which comprise at least one data processing element with slow response (5), wherein the method controls the at least one reader (1) to continuously communicate with one of the plurality of wireless data carriers (2), while at least another one of the plurality of wireless data carriers (2) is processing data with its at least one slow response element (5). The invention further relates to a RFID system comprising at least one reader (1) and a plurality of wireless data carriers (2), each of which comprises at least one slow response element (5), wherein the system is capable to continuously communicate with at least one of the plurality of wireless data carriers (2), while at least another one of the plurality of wireless data carriers (2) is processing data with its at least one slow response element (5).

Abstract: A system and method for a RF transaction device for storing user personal data is disclosed. The invention includes a system and method for facilitating a healthcare transaction using a transponder system configured to store different healthcare information in different storage areas on a database. The invention includes providing account information in ISO/IEC 7816 magnetic stripe Track 1/Track 2 format. The invention also includes an RFID reader for transmitting account and database information. In one embodiment the invention provides an RFID reader as a free standing or a computer implemented device. In another embodiment, biometric security measures are used in conjunction with the transponder system. In another embodiment, the transponder system communicates with one or more third-party healthcare providers to facilitate the transfer of healthcare and personal information.

Abstract: A device aimed for locating in real time self-powered mobile elements by electromagnetic radiation, includes elements (505, 520) for receiving a radioelectric signal including at least one item of synchronization information, these elements being configured to receive energy from a received radioelectric signal, elements (515) for emitting an electromagnetic signal, the electromagnetic signal being emitted in response to an activation signal, and control elements (510) connected to the receiving elements and to the elements for emitting an electromagnetic signal, the control elements being electrically powered by the elements for receiving a radioelectric signal and being configured to generate an activation signal in response to synchronization information.