The working principle of the RFID technology

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

A complete RFID system is composed of reader and electronic tag, that is, the so-called transponder and application software system. Its working principle is that the reader transmits radio wave energy of a specific frequency to drive the circuit to send out the internal data. At this time, the reader will receive and interpret the data in order and send it to the application program for corresponding processing.

In terms of communication and energy sensing between RFID card reader and electronic tag, it can be roughly divided into two types: inductive coupling and backscattering coupling. Generally, low-frequency RFID mostly adopts the first method, while higher frequency RFID mostly adopts the second method.

Depending on the structure and technology used, the reader can be a reading or reading / writing device, which is the information control and processing center of RFID system. The reader is usually composed of coupling module, transceiver module, control module and interface unit. Half duplex communication mode is generally used for information exchange between reader and tag. At the same time, reader provides energy and timing to passive tag through coupling. In practical application, the collection, processing and remote transmission of object recognition information can be further realized through Ethernet or WLAN.