I. What is RFID?
RFID is short name of Radio Frequency Identification. RFID is an untouched wireless automatic identification and data processing technique. It identifies the goal object and obtains relevant data by radio frequency.
Due to its features in technique, it can work in execrable environment, identify the mobile object at high speed, and recognize several tags at one time.
II. RFID system has following 3 parts:
(1) Electronic tag: it is composed of chip and antenna.
According to the read-write times, electronic tag has 3 types, including read only, write only one time programmable and write multiple times programmable, the tag of only read and write only one time programmable usually have unique unchangeable electronic code;
In terms of the frequency, the tag can be divided into 4 kinds, i.e. low frequency, high frequency, ultra high frequency and microwave, where animal tag always uses low frequency.
According to the data processing type, it can be divided into 2 kinds, i.e. active and passive tag, where the passive tag has no power as usual which can be used perpetually;
According to the mode of energy supplying, the tag can be also divided into power tag and non power tag, the non power tag is passive tag
(2) Reader: the device used for read the information of electronic tag can be divided into separate reader and integrated reader in terms of antenna which is separated from module or not. Familiar separate readers are fixed type and typical integrated readers are handset as usual.
(3) Antenna: the device that sends and receives radio frequency between electronic tag and reader.
IV. Basic operational principle of RFID
When entering working region of reader, the antenna of electronic tag starts to receive electromagnetic wave sent from reader and generates induction current by electromagnetic coupling in the coil. The induction current is used as energy by electronic tag to sent the information in the chip back to reader in the form of electromagnetic wave by antenna, and so the overall process is completed.
V. Typical application of RFID technology
Identity recognition for animal
Material circulation and supply management
Manufacture and assembling
Aviation baggage processing
Post/express package processing
Document tracking/library management
Timekeeping of sport
Access control/E-ticket
Auto-charge of road
etc. |
