In some embodiments an apparatus includes a display module and a bi-stable display. The bi-stable display is operatively coupled to the display module and is configured to display a first image at a first time. The display module is configured to be operatively coupled to a wireless module and configured to be wirelessly powered by an external wireless power supply. The display module is configured to receive, at a second time after the first time and in response to a wireless interaction with a wireless device, (1) power from the external wireless power supply and (2) a signal from the wireless module indicative of a second image different from the first image. The bi-stable display is configured to display, in response to a signal indicative of an instruction from the display module, the second image at a third time after the second time.

A method for testing a circuit for a transponder, and transponder circuit, is provided, in which the circuit is operated in a passive mode in that the circuit is supplied with energy from a field, in which, during the passive mode, the circuit receives a command via the field to activate a test routine, in which memory content is stored by the test routine as test data in a memory area of a memory of the circuit predetermined by the test routine, in which, during the passive mode, the test data are transmitted via the field.

A filter element for a filter module for filtering process air for a treatment station, the filter element being equipped with an RFID tag.

User devices (1-4) are each provided with a data connection (20) to a remote server (30) and a beacon transceiver. Device (2) is operable to actively transmit beacon signals including its unique beacon identification code for a limited period. During active transmissions by device (2), devices (1 & 3) are within range of the transmissions and are operable to extract the beacon identification code of the transmitting device (2) and thus directly infer that they are in proximity to the transmitting device (2). The receiving devices (1, 3) communicate with server (30) their own unique beacon identification code and the received beacon identification code of the transmitting device (2). In response, the server (30) communicates details of the transmitting device (2) to the receiving devices (1, 3) and the beacon identification codes of the receiving devices (1, 3) to the transmitting device (2). The transmitting device (2) is thus able to infer the proximity of the receiving devices (1, 3) without the receiving devices (1, 3) having to transmit any beacon signals.

An RFID transponder includes a coding and modulation unit that generates a transmission signal by modulating an oscillator signal with an encoded bit signal. During a first and a second time segment, the encoded bit signal assumes a first and a second logic level, respectively. The transmission signal includes a first signal pulse having a first phase within the first time segment and a second signal pulse having a second phase that is shifted with respect to the first phase by a predefined phase difference within the second time segment. The transmission signal is paused for a pause period between the first and the second signal pulse. The pause period is shorter than a mean value of a period of the first time segment and a period of the second time segment.

A smartphone having: a configurable radio frequency transmitter; a configurable low frequency transponder with at least one low frequency coil; and a smartphone application program that is controlled by a cloud service and that is configured to configure the radio frequency transmitter and the low frequency transponder with protocol parameters and initial data values such that the low frequency transponder mimics a virgin key device that can be programmed to a particular vehicle model.

An inductive wireless power transfer device comprises a transmitter that comprises a transmit coil configured to generate a wireless power signal to a coupling region in response to an input voltage, and a modulator configured to modulate the wireless power signal and encode data with the wireless power signal to establish a back-channel communication link from the transmitter to a receiver. An inductive wireless power receiving device comprises a receiver that comprises a receive coil configured to generate a time varying signal in response to receiving a modulated wireless power signal from a transmitter in a coupling region, and a demodulator configured to demodulate the modulated wireless power signal from an established back-channel communication link from the transmitter to a receiver. Related inductive wireless power transfer systems and methods for back-channel communication from the transmitter to the receiver of an inductive wireless power transfer system are disclosed.

According to one or more aspects of the present disclosure, operations may include monitoring a magnetic field that is around an electronic device. The operations may further include determining, based on the monitoring, that a change in the magnetic field deviates more than an expected amount. In addition, the operations may include, in response to determining that the change in the magnetic field deviates more than the expected amount, activating a near-field communication chip included in the electronic device.

A method for filtering scanned objects displayed on a reader is provided. The reader may scan one or more transponders, and obtain, from a database, an image for each scanned transponder. Each transponder may be associated with an object (e.g., an item of retail inventory). The obtained image for each object may be presented on an interface, and a selection of an object category may be received using the obtained images. A determination may be made as to which objects are associated with the selected object category. A display screen may display data associated with only the objects associated with the selected object category.

A near-field communication (NFC) apparatus includes a clock extractor configured to perform clock recovery based on a first carrier signal sent by an NFC card reader to obtain a field clock signal; a digital phase-locked loop configured to perform frequency tracking on the field clock signal to output a first clock signal; a digital baseband chip configured to perform load modulation based on the first clock signal to generate a second carrier signal; and a controller configured to detect a frequency or a phase of the field clock signal, and selectively perform open-loop control on the digital phase-locked loop based on a detection result.