Long Range Wireless SAW Passive Tag System Using Patch Antenna for Vibration Monitoring

We have developed 920 MHz band long range wireless SAW passive tag system (WSPTS) using patch antenna for the purpose of structural health monitoring (SHM). Our WSPTS has achieved more than 6 m reading distance. Each reflective FMCW signal from the passive tag can be distinguished in the reader unit by realizing Tx-Rx antenna isolation of more than 50 dB by patch antennas.