A magnetic resonance technology is used to implement front and back proximity sensing capability for wireless devices such as a laptap device. For example, a high quality (Q) factor coil antenna may be embedded in a display, such as a liquid crystal display, of a first laptap device to detect other wireless devices (e.g., a second laptap) that are within coupling distance of the first laptap device. In this example, the second laptap device induces a sine wave signal to the first laptap device if the second laptap device is physically located at backside of the first laptap device. Otherwise, the second laptap device may induce a cosine wave signal to the first laptap device if the second laptap device is physically located at the front side of the first laptap device.

A device for the inductive positioning comprises a signal generator, a coil connected with the signal generator, an element for influencing the inductance of the coil depending on its distance to the coil and an evaluator to determine the position of the element with regard to the coil on the basis of a voltage on the coil. The signal generator thereby provides a square wave signal.

A test system for testing a DUT includes near field and intermediate field measurement devices located in a near field and an intermediate field, respectively, of the DUT antenna that sample first and second bounded radiation surfaces, respectively, comprising RF signals emitted by the DUT antenna in at least first and second directions in which the bounded radiation surfaces extend. A receiver of the test system generates first and second matrices of near field and intermediate field values, respectively, from the samples obtained by the near field and intermediate field measurement devices, respectively and inputs them to processing logic of the test system. The processing logic processes the first and second matrices of near field and intermediate field values, respectively, and derives a third matrix of near field phase values therefrom.

Power signals and data signals can be wirelessly transmitted from a surface read-out unit to a downhole tool and the downhole tool can wirelessly transmit data about an environment of a wellbore to the surface read-out unit. The downhole tool can be used for a wellbore operation and include at least one coupler. The surface read-out unit can wirelessly transmit the power signals to the downhole tool and can wirelessly transceive data signals with the downhole tool. The surface read-out unit includes at least one wireless coupler through which to transfer the power signals and the data signals to the at least one coupler of the downhole tool.

A sensor system is disclosed for sensing the position of an object. The system can include a power source and a nullification circuit electrically connected to the power source, the nullification circuit including an output voltage. An electrical medium can be integrated into the nullification circuit, the electrical medium producing a standing wave electric field about the electrical medium when power is supplied from the power source to the electrical medium. The nullification circuit is configured such that the output voltage of the nullification circuit is substantially zero when power is supplied to the electrical medium and the object is not within a predetermined minimum distance from the electrical medium, the output voltage of the nullification circuit having a non-zero value when the object is within the predetermined minimum distance from the electrical medium.

An electromagnetic induction type coordinate positioning apparatus is provided. The apparatus includes a first induction coil, a second induction coil, a trigger circuit, and a control circuit. The first induction coil is flowed through a first current signal, and the first induction coil is configured to sense a pointer device when the electromagnetic induction type coordinate positioning apparatus is in a sleep mode, and generate a first induction signal when detecting the pointer device. The second induction coil is flowed through a second current signal, and the first induction coil is configured to sense and communicate with the pointer device when in an operating mode. The trigger circuit sends an interrupt signal according to the first induction signal. The control circuit interrupts the sleep mode according to the interrupt signal and switches to the operating mode. The control circuit in the operating mode controls the second control signal to flow through the second induction coil.

The invention provides a method and system for precisely measuring AC power and detecting load impedance using a precise analog front-end, zero-crossing detectors, and a phase detection system capable of extracting precise phase information from the sensed voltage and current measurements. More particularly, the invention provides an apparatus, comprising a transmit circuit configured to generate a wireless field via an antenna for transferring charging power to a receiver device, for determining a phase difference between a first signal and a second signal. The apparatus further comprises a phase detection circuit to output a phase signal indicating a duration of a phase offset between a time-varying voltage and a time-varying current of the transmit circuit. The apparatus further comprises a capacitor configured to receive a variable current from a current source for the duration of the phase offset between the time-varying voltage and a time-varying current.

An electronic system for monitoring a physical parameter includes an ADM comprising an accumulation mode sensor for measuring the physical parameter by generating electrical energy associated with the physical parameter in response to a surrounding condition, and an energy storing device coupled to the accumulation mode sensor for accumulatively storing the generated electrical energy; a power source; and an SoC coupling with the ADM and the power source, configured such that the stored electrical energy is monitored, and when the stored electrical energy is equal to or greater than a pre-defined threshold, a wake-up event is generated to trigger the SoC to operates in a run mode in which the physical parameter is wirelessly transmitted to a receiver and the stored electrical energy in the energy storing device is discharged, and then the SoC returns to a sleep mode in which a minimal power is consumed.

The present application relates to the detection of moving vehicles and other objects, in particular though not exclusively for the application of switching stationary charging pads for moving electric vehicle charging. There is provided an electric vehicle detecting apparatus for switching a charging pad for charging a vehicle transmitting a locating signal, the apparatus comprising two sensors separated in the direction of travel of the vehicle, and a detector arranged to detect the vehicle by comparing the locating signals received by each of the two sensors.

An electronic device that includes a sensor module, a measuring module and a near field communication (NFC) device. The sensor module receives an input signal. The measuring module measures the strength of the input signal and determines whether the input meets a predefined threshold. If the strength of the input signal meets the predefined threshold, the measuring module activates the NFC device. If the strength of the input signal does not meet the predefined threshold, the measuring module de-activates the NFC device.