SAW BASED PASSIVE RADIO SENSIG SYSTEM USING PIEZOELECTRIC POWER AND WIRELESS POWER TRANSMISSION

摘要

The present invention discloses a surface acoustic wave-based wireless power / wireless sensing system.;Surface acoustic wave-based wireless power / wireless sensing system of the present invention includes an energy conversion unit for converting mechanical energy into electrical energy according to changes in the physical environment of the surrounding; A wireless power rectifying unit rectifying and outputting microwave power applied through wireless power transmission; An energy storage unit for rectifying and storing the electric energy generated by the energy conversion unit and storing an output voltage of the wireless power rectifying unit; A pulse generator for generating and outputting an RF signal by receiving electrical energy stored in the energy storage unit; Sensing unit for sensing the pressure applied from the outside; And a SAW transponder for generating a surface acoustic wave by receiving an RF signal from the pulse generator, varying the surface acoustic wave according to the magnitude of the pressure applied to the sensing unit, and converting and converting the variable surface acoustic wave into an RF sensing signal. Using semi-permanent piezoelectric power generation and wireless power transmission, semi-permanent real-time continuous tire pressure sensing is possible, and long-distance transmission of the sensed signal is possible.