RFID technology actually refers to radio frequency technology. Its technology mainly relies on the principle of magnetic field or electromagnetic field to realize two-way communication between devices through radio frequency, so as to realize the function of exchanging data. The biggest feature of this technology is that it can obtain each other without contact. RFID information, ETC, logistics, and libraries are several typical application scenarios. The commonly used radio wave frequency bands for RFID technology mainly include: low frequency, high frequency, ultra-high frequency and microwave frequency bands.RFID system compositionRFID system is mainly composed of three parts: reader, electronic label and data management system.

RFID Reader: Also known as a reader , it is mainly used to read out the information in the electronic tag, or write the information required by the tag into the tag. According to different uses, readers are divided into read-only readers and read/write readers, which are the information control and processing center of the RFID system. When the RFID system works, the reader transmits radio frequency energy in an area to form an electromagnetic field, and the size of the area depends on the transmission power. The tags in the coverage area of the reader are triggered, send the data stored in it, or modify the data stored in it according to the instructions of the reader and can communicate with the computer network through the interface .

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