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working principle of RFID
Jun 28, 2018

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

A complete RFID system is composed of three parts: a reader and an electronic tag, namely a so-called transponder and an application software system. The working principle is that Reader emits radio wave energy of a specific frequency to drive the circuit. The internal data is sent out. At this point, the Reader receives the interpretation data in sequence and sends it to the application program for processing.

The communication between the RFID card reader and the electronic tag and the energy sensing method can be roughly divided into two types: inductive coupling and backscatter coupling. Most low-frequency RFIDs use the first type, and higher frequencies use the second method.

The reader can be a read or read/write device depending on the structure and technology used, and is an RFID system information control and processing center. The reader is usually composed of a coupling module, a transceiver module, a control module, and an interface unit. Half-duplex communication is generally used for information exchange between the reader and the transponder, and the reader is coupled to the passive transponder to provide energy and timing. In practical applications, management functions such as collection, processing, and remote transmission of object identification information may be further implemented through Ethernet or WLAN. The transponder is the information carrier of the RFID system, and the transponder is mostly composed of coupling originals (coils, microstrip antennas, etc.) and microchips constituting a passive unit.

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