Radio frequency identification, that is RFID technology, also known as electronic tag, radio frequency identification, is a communication technology that can identify specific targets to read and write related data through radio signals without mechanical or optical contact between the identification system and specific targets. Commonly used RFID technologies include low frequency (125k~134.2K), high frequency (13.56Mhz), ultrahigh frequency, passive and other technologies. RFID readers are also divided into mobile and fixed ones. At present, RFID technology is widely used, such as libraries, access control systems, food safety traceability, and RFID technology in supply chain management.
Each RFID tag which is composed of coupling elements and chips has a unique electronic code and can attach to the object to identify the target object. Reader: A device that reads (and sometimes writes) tag information, can be designed as a handheld RFID tag reader or fixed reader. Antenna: it transmits radio frequency signals between the tag and the reader.
The basic working principle of RFID technology is not complicated. After entering the magnetic field, the RFID tag receives the radio frequency signal from the reader and uses the energy obtained by the induced current to send out the product information stored in the chip (Passive Tag), or actively sends a signal of a certain frequency (Active Tag). Then the reader reads and decodes the information, and sends it to the central information system for relevant data processing.