The present invention provides a MEMS and a sensor having the MEMS which can be formed without a process of etching a sacrifice layer. The MEMS and the sensor having the MEMS are formed by forming an interspace using a spacer layer. In the MEMS in which an interspace is formed using a spacer layer, a process for forming a sacrifice layer and an etching process of the sacrifice layer are not required. As a result, there is no restriction on the etching time, and thus the yield can be improved.

A controller may be configured to generate commands to position a vehicle relative to primary inductive charge coils that are configured to charge TPMS arrangements. A controller may further be configured to generate commands based on data indicative of electromagnetic field strength between TPMS arrangements and a corresponding coil to reduce a difference in power received by the arrangements during a charge period.

The aircraft tire pressure resonant loop link assembly electromagnetically couples a magnetic field between a wheel axle electromagnetic adapter transformer primary coil and a tire pressure sensor receiver coil for powering a tire pressure sensor, and includes a pair of spaced apart electrically conductive connecting arms, a single electrically conductive primary loop electrically connected to first ends of the connecting arms mounted adjacent to a secondary tire pressure sensor coil, and a circuit including a resonant tuning capacitor and a secondary coil with one or more electrically conductive loops at second ends of the connecting arms. The tire pressure sensor coil pair includes a transformer core, and secondary resonant coil pair also includes a transformer core.

The present invention provides a MEMS and a sensor having the MEMS which can be formed without a process of etching a sacrifice layer. The MEMS and the sensor having the MEMS are formed by forming an interspace using a spacer layer. In the MEMS in which an interspace is formed using a spacer layer, a process for forming a sacrifice layer and an etching process of the sacrifice layer are not required. As a result, there is no restriction on the etching time, and thus the yield can be improved.

A wireless sensor includes an antenna, a tuning circuit, a pressure sensing circuit, a processing module, and a transmitter. Collectively, the pressure sensing circuit, the antenna, and the tuning circuit have one or more radio frequency (RF) characteristics and the pressure sensing circuit causes the RF characteristic(s) to vary with varying sensed pressures. The processing module detects a variance of the RF characteristic(s) from a desired value. In response to the detecting of the variance, the processing module adjusts the tuning circuit to substantially re-establish the desired value of the RF characteristic(s). The processing module generates a message regarding the adjusting of the tuning circuit, wherein a level of the adjusting is representative of a variance of pressure sensed by the pressure sensing circuit. The transmitter transmits the message.

A wheel rim device is adapted to be signally connected to a host computer of a tire pressure device, is adapted for a tire pressure detector of the tire pressure device to be mounted thereon, and includes a wheel rim body, an electric power generating mechanism configured to be driven by the wheel rim body to rotate to generate electric power, and a tire pressure indicator. The tire pressure indicator includes a power storage module electrically coupled to the electric power generating mechanism to store the electric power. The tire pressure indicator is adapted to wirelessly receive a tire pressure value signal that indicates a tire pressure value from the host computer and is configured to emit light according to the tire pressure value.

A wheel rim device is adapted for a tire pressure detector to be mounted thereon, and includes a wheel rim body, an electric power generating mechanism, and a tire pressure indicator electrically coupled to the electric power generating mechanism. The tire pressure indicator includes a wireless communication module, a light emitting module, and a control module signally connected to the wireless communication module and the light emitting module. When the wheel rim body rotates, the electric power generating mechanism rotates and generates the electric power, the tire pressure indicator receives the electric power and is energized. The wireless communication module is adapted to wirelessly receive a tire pressure signal from the tire pressure detector. The control module is configured to obtain a tire pressure value from the tire pressure signal and control the light emitting module to emit light according to the tire pressure value.

A wireless sealant and pressure monitoring system for tubeless tires includes an integrated wireless component positioned inside a tubeless tire. The integrated wireless component comprises a first and second conductive sealant sensor pad, a current sensor, and a pressure sensor. The current sensor measures an electrical current flowing between the first and second sealant sensor pads, providing a measure of the sealant level inside the tire. The pressure sensor measures the pressure inside the tubeless tire. The system also includes a wireless transmitter in communication with the current sensor and pressure sensor, configured to transmit data corresponding to the measured electrical current and measured pressure.

A bicycle rim includes a rim well which is connected to rim walls. A pressure sensor is connected to the rim well. The pressure sensor is electrically connected to an NFC antenna for contactless transmission of data and contactless reception of energy.

A radio frequency identification (RFID) tag includes an antenna, an analog front end, a processing circuit, and memory. The analog front end includes a power circuit, a tuning circuit, a transmitter, and a receiver. The power circuit is operably coupled to convert a radio frequency (RF) signal into a power supply voltage. The tuning circuit, when enabled, adjusts an RF characteristic of the analog front end to tune power harvesting from the RF signal. The transmitter is operably coupled to transmit a response signal to the RFID reader via the antenna. The receiver is operably coupled to receive a command signal from the RFID reader, wherein the command signal is contained within a portion of the RF signal. The processing circuit is operable to interpret the command signal and generate the response signal.