Surface acoustic wave based radio frequency identification

In this paper, a novel SAW RFID tag based on UWB chirp spread spectrum theory was proposed. The tag designation is in accordance with FCC standards of UWB wireless communications. The combination of UWB for SAW RFID has the characteristic of short delay due to large bandwidth and low energy required for the reader. Moreover, the encoding and detection for UWB SAW tag, which replaced the universally employed pulse position and on/off encoding methods in SAW tags with its central frequency of 2.45GHz and bandwidth of 82.5MHz, offers an effective way for multi-access SAW RFID tag system. Implementation of UWB CSS SAW RFID tag was demonstrated.