RFID is an abbreviation for Radio Frequency IdenTIficaTIon in Radio Frequency Identification Technology. Radio frequency identification technology is an automatic identification technology that began to emerge in the 1990s. This technology is being widely used in the world. In China, the technology and its application are in the primary development stage, and there are many problems such as low technical level and incomplete standard specifications. At the same time, radio frequency identification technology has broad development prospects and huge market potential in China. Compared with bar code technology, the development and application of radio frequency identification technology will be a technological revolution in China's automatic identification industry. However, while new wireless technologies are driving the development of related industries, if they are used improperly, they will inevitably bring frequency interference. How to coexist peacefully with existing radio services is the main consideration of this paper.
1. Introduction to RFID technologyRadio frequency identification technology is a technology that uses radio frequency signals to realize contactless information transmission through spatial coupling (alternating magnetic field or electromagnetic field) and to achieve identification purposes through the transmitted information.
Radio frequency identification systems typically consist of an electronic tag (radio frequency tag) and a reader. The electronic tag has a certain format of electronic data, which is often used as the iconic information of the item to be identified. In the application, the electronic tag is attached to the item to be identified as an electronic mark of the item to be identified. The reader and the electronic tag can exchange information according to the agreed communication protocol. Usually, the reader sends a command to the electronic tag, and the electronic tag returns the iconic data of the memory to the reader according to the command of the received reader. . This communication is realized by the spatial coupling of the alternating magnetic field or electromagnetic field and the modulation and demodulation of the radio frequency signal in the contactless mode.
At present, RFID technology is mainly used in vehicle identification, automated production line management, livestock identification, identification, and access control management.
Figure 1 Schematic diagram of the RFID system
Table 1 Application of RFID technology
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