RFID (Radio Frequency Identification: Radio Frequency Identification), commonly known as "electronic label", is a non-contact automatic Identification technology, it through Radio Frequency signal automatically identify target objects and access to relevant data, identify work without manual intervention, as a wireless version of the barcode, RFID technology has a bar code does not have waterproof and magnetic resistance to high temperature and long service life read distances of label information stored in the data can be encrypted storage capacity bigger changes freely, etc, its application will bring revolutionary change to retail logistics and other industries
Radio frequency tag is physically composed of three parts: tag (antenna reader tag) : it is composed of coupling elements and chips, each tag has a unique electronic code, high-capacity electronic tag has a user write area, attached to the object to identify the target object;Reader: a device designed to read (and sometimes write) label information, either handheld or stationary;Antenna: the transfer of an rf signal between a tag and a reader
Tag inside the antenna and ID chip Encapsulated electronic tags Antennas, readers, and handheld terminals
Data storage: compared with traditional labels, it has a larger capacity (1bit -- 1024bit), and the data can be updated at any time and can be read and written.
Reading and writing speed: compared with bar code, it does not need linear alignment scanning, so it can read and write faster, and can recognize multiple targets and movements.
Easy to use: small size, easy to package, can be embedded in the product;
Security: dedicated chip, unique serial number, difficult to copy;
Durable: no mechanical failure, long life, resistance to harsh environment.
The basic working principle of RFID technology is not complicated: the reader sends the rf signal of a specific frequency through the transmitting antenna, and when the electronic tag enters the effective working area, it generates an induced current, so as to obtain the activation of the energy electronic tag, which enables the electronic tag to send its encoded information through the built-in radio frequency antenna.The receiving antenna of the reader receives the modulated signal sent from the tag, which is transmitted to the reader signal processing module by the antenna regulator. After demodulation and decoding, the effective information is sent to the background host system for relevant processing.The host system recognizes the identity of the tag based on logical operation, and makes corresponding processing and control for different Settings. Finally, it sends out an instruction signal to control the reader to complete the corresponding reading and writing operations
There are two types of Passive Tag: Passive Tag and Passive Tag.Passive sensor itself is not power, the power source is from the Reader, the Reader to launch a frequency make the sensor to produce energy and the data back to the Reader, the volume is lightweight and has a long service life, the induction distance shorter Active Tag (Active) : the price is higher, because of the built-in battery, so the volume than the Passive Tag, use fixed number of year of the longer induction distance according to the frequency of high and low, generally can be divided into LF HF UF three categories:Low Frequency: the induction distance of Low Frequency is short and the reading speed is slow, with 125KHz as the main Frequency and good penetration.High Frequency: the induction distance of 10~15MHz High Frequency is slightly longer, and the reading speed is faster than that of low Frequency, mainly 13.56mhz.Ultra High Frequency/Microwave: between 850~950MHz(UHF) and 2.45ghz, the induction distance is the longest, the speed is the fastest and the penetration is poor
Electronic tags as data carrier, can play the role of identity identification items tracking information collection in a foreign country, the electronic label has been extensive to apply in the field in electronic tag reading and writing device of RFID antenna and application software system is directly connected with the corresponding management information system (each item can be accurately track, this kind of comprehensive information management system for customers bring many benefits, including real-time data collection can secure data access channel offline for all product information, and so on in foreign countries, RFID technology has been widely applied in such as industrial automationBusiness automation and many other areas