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RFID is the English abbreviation of radio frequency identification, is a kind of automatic identification technology, can identify specific targets and read and write relevant data through radio signals, without the need to establish mechanical or optical contact between the identification system and specific targets, it is considered to be one of the most promising information technology in the 21st century. The radio signal is transmitted from the tag attached to the item through an electromagnetic field tuned to radio frequency to automatically identify and track the item. Some tags can get energy from the electromagnetic field emitted by the