RFD的基本通信原理-4 Far-Field Propagation and Backscatter Principle Thus it must satisfy P2>Pts for the tag to be powered up and resolve the received signal,and also P4 Prs for the reader to detect and resolve the received signal. Distance r P2 Matching Network Reader Za 四V胶 TAG Reader antenna Tag antenna gain Gt gain Gr Fig.1.Far-Field Propagation for RFID systemRFID的基本通信原理-4 • Far-Field Propagation and Backscatter Principle – Thus it must satisfy P2 > Pts for the tag to be powered up and resolve the received signal, and also P4 > Prs for the reader to detect and resolve the received signal. Pts Prs P4 P2