Communication and Powering Scheme for Wireless and Battery-Less Measurement
The paper presents solution for wireless and battery-less measurement in the enclosed areas. The principle is based on passive RFID; nevertheless this paper is focused on high power-demanding applications such as MEMS accelerometers, gas sensors, piezoresistive strain gauges, etc. Standard RFID communication scheme (sensing the input current change on the primary side) cannot be used in this case, because the communication channel is overloaded by the high power load. Paper presents possible solution which is based on the dual frequency scheme - one frequency for powering and other for the communication. This is ensuring capability for measurement up to several centimeters in the frequency bands 125 kHz and 375 kHz.