RFID (Radio Frequency Identification) technology, also known as radio frequency identification, is a kind of communication technology, through radio signals to identify specific targets and to read and write data, without establishing a mechanical or optical contact between recognition system and the specific goal. Commonly used in low frequency (125k~134.2K), high frequency (13.56Mhz), ultra high frequency, microwave and other technologies. At present RFID technology is widely used, such as: library, access control system, food safety trace ability, etc..
The basic principle of RFID technology is not complex: the label into the field, RF signals received by the reader, sending the product information stored in the chips after obtained energyfrom current, or send a certain frequency signal by active tags, the reader will sent it to the central information system for data processing after reading and decoding the information.
A complete set of RFID system is consist of reader, electronic tag (TAG) is also called the transponder, and application software system, the working principle is that the Reader launch a certain frequency radio wave energy to Transponder, to drive the Transponder circuit to sent the internal data, at this time, Reader will receive and interpret the data in order, and sent to application to do the corresponding treatment.
The mode of communication and energy sensing between RFID card reader and tag ican generally be divided into: Inductive Coupling and Backscatter Coupling. Generally low frequency RFID mostly use the first type, while the higher frequency is mostly use the second type.
According to the structure and technology of the reader, the reader can be read or read / write equipment, which is the control and processing center of RFID system information. The reader usually consists of a coupling module, transceiver module, control module and interface unit. Half duplex communication mode is used for information exchange between the reader and the responder, and the reader can provide energy and time sequence through the coupling to the passive transponder. In practical applications, the Ethernet or WLAN can be used to realize the information collection, processing and remote transmission of the object identification. Responder is the information carrier of RFID system, which is mostly composed of coupling components (coils, microstrip antennas, etc.) and micro chip.
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