Radio frequency identification (RFID) is a generic term that is used to describe a system that transmits the identity (in the form of a unique serial number) of an object or person wirelessly, using radio waves. RFID is designed to enable readers to capture data on tags and transmit it to a computer system—without needing a person to be involved. So that, RFID can be used in various bad environment. RFID technology enable people to identify fast moving object and to identify multi-tags simultaneously, when all the relative operation is of great rapidness and convenience.

Short distance RFID products could be used in filthy, dust pollution and other bad environment to replace bar codes, for example, they could be used in a factory on the assembly line to track objects. Long-Distance RFID products are always used in the transport traffic, and their identification range could be up to several tens meter, such as automatic vehicle charges or automatic vehicle identification. RFID system consists of three components

Tag: consists of coupling components and chips. Each label has an exclusive electronic code, which is attached to the object; RFID Tag have about 1k bits data storage of objects. During the Automatic Identification Management System, every electronic tag retains the information of one object’s attribute, state and code and so on. RFID is usually installed on the surface of objects.

Reader: is an equipment to read (sometimes also can write) tag information, and it can be designed to a portable or fixed style. Its main function is as follow:

---to read the data information that stored in tag

---to write some data information into the tag

Amend (or re-write) the data information of the electronic tag.

Antenna: transmit the RF signal between the tag and the reader.

Work Principle :

When the object equipped with RFID tag approach reader within a distance of 0-10 meters and people use the reader to transmit reading signal, the tag installed on the surface of the object will received reading signal from the reader, and then, the tag will transmit this signal and its data information together to the reader. After receiving the transmitting information from the tag, the reader can deal with the information by its internal microprocessor and read out the RFID identification codes and other information that stored in the electronic tags separately.