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RFID system working principle

source:RFID News    Popular:Uhf Animal Tag   Release Time:2022-01-26 09:18:59   Article author:sznbone

  RFID system working principle

  A typical RFID system includes three parts: an electronic tag for programmable data, a reader and a remote computer for processing data. The electronic tag is also the radio frequency card, which has the ability of intelligent reading and writing and encrypted communication. The reader is composed of a wireless transceiver module, a control module and an interface circuit. It sends a request signal to the tag through the modulated RF channel, the tag answers the identification information, and then the reader sends the signal to the computer or other data processing equipment.

  In practical applications, the electronic tag is attached to the surface of the object to be identified, and the electronic data in the agreed format is stored in it. The reader sends a radio frequency signal of a certain frequency through the antenna. When the tag enters the magnetic field, it generates an induced current. At the same time, it uses this energy to send out its own encoding and other information. The reader reads and decodes the information and transmits it to the host for related processing. , So as to achieve the purpose of automatically identifying objects. The structure of the radio frequency identification system and the direction of information transmission.

  The biggest feature of the RFID system is non-contact identification, so it can identify multiple electronic tags and high-speed moving tags at the same time. It communicates wirelessly without exposed electrical contacts. The chip of the electronic tag is packaged according to different application requirements and can withstand harsh environments.

  This design adopts a radio transmission radio frequency identification system, and the RFID used at all monitoring points in the mine adopts active working methods. There are two types of underground monitoring points: fixed monitoring points and mobile monitoring points. According to the working principle of RFID, the RFID on the fixed monitoring point is equivalent to a reader that only receives and does not send, and the RFID on the mobile monitoring point is equivalent to an electronic tag.

  The radio frequency chip used in the design is Chipcom's CC1000, which has the characteristics of a single-chip RF transceiver. The CC1000 with separate transceiver design has the advantages of strong anti-interference ability, high communication speed, small size, low power consumption, stable performance, and high cost performance. Considering the cost and other aspects, the working frequency of RFID is 433MHz when designing. After testing, it is proved that the function requirements of this system can be met in terms of transmission distance and data reliability.


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