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RFID(electronic tag, radio frequency identification) technology will permeate every aspect of our life in the future.Its working principle is "low frequency based on transformer coupling model (energy transfer and signal transfer between primary and secondary), and high frequency based on the spatial coupling model of radar detection target (radar transmitting electromagnetic signal encounters target and carries target information back to radar receiver).Harris tokman's "communication using reflected power", published in 1948, laid the theoretical foundation for rfid technology.
