The principle of RFID technology

- Dec 04, 2018-

The basic principle of RFID technology is not complicated: after the tag enters the magnetic field, it receives the RF signal from the interpreter and sends the product information (passive or passive label) stored in the chip with the energy obtained by the inductive current. Or the tag sends the signal of a certain frequency (Active Tag, active tag or active tag) and the interpreter reads the information and decodes it and sends it to the central information system for data processing. 

A complete RFID system consists of a reader and an electronic tag, known as a transponder and an application software system. Its working principle is that Reader emits radio wave energy of a specific frequency. Used to drive the internal data sent out, this time the Reader will receive in order to interpret the data, sent to the application to do the corresponding processing. 

The communication and energy sensing between RFID card reader and electronic tag can be divided into two types: inductive coupling and backscattering coupling. In general, the first type of RFID is mostly used in low frequency, while the second one is used in higher frequency. 

The reader can be read or read / write device depending on the structure and technology used. It is the information control and processing center of RFID system. Readers usually consist of coupling module, transceiver module, control module and interface unit. The half-duplex communication between reader and transponder is usually used to exchange information, and the reader provides energy and timing to passive transponder by coupling. In practical application, the management functions of object recognition information collection, processing and remote transmission can be realized through Ethernet or WLAN. Transponder is the information carrier of RFID system. The transponder is mostly composed of coupling elements (coil, microstrip antenna) and microchip.

Based on the simple principle of RFID technology, we can foresee more and more touch panel pc is going to integrate with RFID card reader, to use this new technology.