This disclosure provides systems, methods and apparatus for detecting foreign objects. In one aspect an apparatus for detecting a presence of an object is provided. The apparatus includes a resonant circuit having a resonant frequency. The resonant circuit includes a sense circuit including an electrically conductive structure. The apparatus further includes a coupling circuit coupled to the sense circuit. The apparatus further includes a detection circuit coupled to the sense circuit via the coupling circuit. The detection circuit is configured to detect the presence of the object in response to detecting a difference between a measured characteristic that depends on a frequency at which the resonant circuit is resonating and a corresponding characteristic that depends on the resonant frequency of the resonant circuit. The coupling circuit is configured to reduce a variation of the resonant frequency by the detection circuit in the absence of the object.

Devices, systems and methods for magnetic field coupling, as described herein, optimize magnetic coupling between transducers generating and detecting quasistatic magnetic fields by translating the generated and detected magnetic fields into a common frame of reference, such as the Earth's gravitational field. In general, a receiving device has knowledge of the strength and direction of a quasistatic magnetic field generated by a transmitting device, which allows the generated magnetic field to be measured and interpreted by the receiving device in the context of the common frame of reference. Such devices, systems, and methods may use magnetic coupling, for example, for proximity detection and/or for communication between devices. Magnetic coupling may be used for proximity detection, for example, by detecting a magnetic field having a defined magnetic field range and/or by measuring magnetic field strength and/or direction and determining distance and/or location.

A temperature sensing device for a heating surface for food products includes a temperature probe configured to be coupled to the heating surface and to generate an electrical signal indicative of a temperature of the heating surface. The device includes a controller in electrical communication with the temperature probe. The device includes a wireless transmitter in electrical communication with the controller. The controller is configured to read the electrical signal from the temperature probe and to provide an output signal to the wireless transmitter. The wireless transmitter is configured to wirelessly transmit a temperature signal to a transceiver based on the output signal. The wireless transmitter is configured to wirelessly receive energy. The controller is configured to be powered by the received energy from the wireless transmitter.

A near field communication (NFC) system includes an NFC reader that communicates with a remote NFC device through load modulation. The NFC reader transmits a wireless carrier signal from an antenna and has a plurality of passive receive antennas to receive the modulated signal. The NFC reader also has circuitry to provide a plurality of data streams that define data recovered from the modulated wireless carrier signal received from the plurality of receivers. The circuitry then selects, based on a location of the NFC device relative to the NFC reader, one of the plurality of data streams for use in processing a transaction.

A circuit monitors a first voltage delivered by a battery. The monitored first voltage is compared with a second voltage. When the comparator detects that the first voltage is smaller than the second voltage, a counter starts counting. If the value of the counter during said counting exceeds a limiting value, an interruption signal is generated to control an operating mode of an electronic device power by said battery.

A batteryless wireless sensor system includes a data acquisition system, a radio frequency (RF) transceiver, and a batteryless wireless sensor device. The RF transceiver is in communication with the data acquisition system, transmits a RF signal, and receives sensor data and provide the sensor data to the data acquisition system. The batteryless wireless sensor device includes a RF transmitter, an analog to digital converter (ADC), and a sensor. The batteryless wireless sensor harvests energy from the RF signal and generates a DC signal based on the energy harvested from the RF signal, powers up and operates the ADC and the sensor based on the DC signal, and generates sensor data. The batteryless wireless sensor then transmits the sensor data via the RF transmitter to the RF transceiver. In certain examples, the ADC is implemented as a current mode ADC.

A bicycle including a frame with a fork, the fork having dropouts between which a wheel axle is mounted. The wheel axle includes a sensor and/or an electric component arranged to be connected to a control element. A detachable electric connection is provided between the sensor and/or electric component and the control element. The detachable electric connection is positioned between the wheel axle and the thru-axle.

Embodiments of the present invention provide systems and methods for performing tests on a device under test (DUT) based on training data derived from a set of training DUTs using nearfield measurement data. Nearfield measurement data can be mapped to performance metrics that approximate performance metrics derived from the far-field measurement data. Nearfield measurements can then be performed on a DUT to generate second nearfield measurement data, and performance metrics of the DUT are generated using the second nearfield measurement data and the mapped performance metrics derived from the training DUTs.

The application relates to an accessory for a kitchen appliance, the kitchen appliance including a reading arrangement having a reading controller and at least one reading antenna connectable to the reading controller, the accessory including at least one transponder arrangement, wherein the transponder arrangement includes a transponder and an accessory position sensor connected to the transponder, wherein the accessory position sensor is configured to detect at least one accessory position parameter of the accessory, and wherein the transponder arrangement is configured to transmit the detected accessory position parameter to the reading arrangement.

In accordance with a first aspect, a communication device is provided, comprising: a transmitter configured to transmit one or more radio frequency signal pulses to an external communication device; a receiver configured to receive one or more response signals in response to the radio frequency signal pulses transmitted by the transmitter; a signal analyzer configured to detect one or more characteristics of the response signals, to compare the detected characteristics with predefined reference characteristics and to generate an output indicative of a result of comparing the detected characteristics with the predefined reference characteristics; a processing unit configured to determine at least one category to which the external communication device belongs based on the output generated by the signal analyzer. In accordance with a second aspect, a corresponding method of operating a communication device is conceived. In accordance with a third aspect, a corresponding computer program is provided.