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RFID Technology and Its Working Principle (Part I)

RFID technology, also known as electronic tag and radio frequency identification, is a kind of communication technology. It can identify specific targets through wireless signals as well as read and write relevant data without establishing mechanical or optical contact between the identification system and specific targets. Commonly used technologies are low frequency (125k - 134.2k) technology, high frequency (13.56MHz) technology, UHF technology, passive technology, etc. RFID reader-writers can be divided into mobile and fixed reader-writers. At present, RFID technology is widely used in libraries, access control systems, food safety traceability, etc.


Basic components of RFID


RFID is composed of coupling elements and chips. Each RFID tag has a unique electronic code and is attached to the object to identify the target object. Reader: a device for reading (sometimes for writing) tag information, which can be designed as a handheld RFID reader or a fixed reader antenna. It can transmits RF signals between tags and readers.


The working principle of RFID technology


The basic working principle of RFID technology is not complicated. After the RFID tag enters the magnetic field, it receives the radio frequency signal from the reader, and sends the product information stored in the chip through the energy obtained by the induced current (passive tag), or sends the signal of a certain frequency by the tag actively (passive tag). After the reader reads the information and decodes it, the information is sent to the central information system for relevant data processing.