Rfid (radio frequency identification) is a non-contact automatic identification technology, which realizes the automatic identification of target objects and the collection of related data through radio wave communication. RFID system consists of three main parts: electronic tag, reader and back-end server.

Electronic tag is composed of transceiver antenna, AC/DC circuit, demodulation circuit, logic control circuit, memory and modulation circuit, which can be divided into passive electronic tag, semi-passive electronic tag and active electronic tag. The reader is used to read the data in the electronic tag and process and store it through the background server.

RFID technology has the advantages of fast, remote, NLOS identification and high storage capacity, and is widely used in various fields, such as logistics management, identity identification, access control system, manufacturing and so on.

It should be noted that RFID technology and RFID system are different concepts. RFID technology is a kind of radio frequency identification technology, and RFID system is a complete system composed of electronic tags, readers and background servers.