A complete set of the RFID system working principle and structure

A complete set of the RFID system, is a reader (Reader) and the electronic label (TAG) that is called a transponder (Transponder) and application software system consists of three parts, its working principle is a specific frequency Reader emits radio frequency energy to Transponder for internal actuation Transponder circuit will be sent out of the data, in order to receive Reader will interpret the data, given to the application accordingly.

RFID card readers and electronic communication between the label and the energy inductive way generally can be divided into, inductive coupling (InductiveCoupling) and backscatter coupling (BackscatterCoupling) two, most low-frequency RFID in general the first type, and a high-frequency most of the second kind of way.

Reader according to the use of structures and technologies can be read or read/write device, is the RFID system information control and processing centres.

Readers typically consists of coupling module, transceiver modules, control module and interface modules. Readers and portable between generally use half-duplex communication for the exchange of information, while the reader through the coupling to passive transponders provide energy and time series. In practice, you can further through Ethernet or WLAN, and other identifying information for objects of the collection, processing and remote transmission and other management functions. Transponder is RFID system information carriers, the transponder is mostly original by coupling (microstrip antenna coil, etc) and micro-chips on passive unit.

Transponder typically contain:

A. antenna: used to receive the signal sent from the reader, and the requested data back to the reader.

B.AC/DC circuit: the card reader sent over radio frequency signals converted to DC power supply, and the large capacitance stored energy, then by the regulator to provide stable power supply.

C. demodulation circuit: removal of the carrier to remove the genuine modulated signal.

D. logic control circuit: decoding the sent from the reader signals, and in accordance with the requirements of the echo data to the reader.

E. memory: for system operation and identification of the location of the data stored.

F. modulation circuit: logic control circuit is sent out after the data has been loaded into the modulation circuit giving readers an antenna.

Readers often contains:

A. antenna: to send a wireless signal to the Tag and the Tag response back data receive back.

B. system frequency generator: generate system operating frequency.

C. phase lock loop (PLL) who: produce RF carrier signal required

D. modulation circuit: the Tag you want to load into the carrier of the signal and sent to the RF Circuit.

E. microprocessor: generate Tag you want to send a signal to the modulator circuit, while decoding Tag echo signal and data back to the application, if the encrypted system also needed to do the encryption and decryption operations.

F. storage: storage, user programs and data

G. demodulation circuit: demodulation tag sent over the weak signal, then gave a microprocessor handles.

H. peripheral interface: used to and your computer is online

Application software systems typically include:

A. hardware drivers: connectivity, display and processing the card reader.

B. control applications: controlling the operation of the card reader/writer, receiving card data to the return path and corresponding processing, such as opening, closing, dispatch, record ...

And so on.

C. database: store all data related to the Tag, for the use control program.