RFID components and features
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RFID is the abbreviation of Radio Frequency Identification (RFID) technology. Radio frequency identification technology is an automatic identification technology that began to mature in the 1990s. Radio frequency identification technology is a spatial coupling using radio frequency signals. An alternating magnetic field or an electromagnetic field is a technique for achieving contactless information transfer and achieving the purpose of identification through the transmitted information.
Compared with the widely used automatic identification technologies such as camera, bar code, magnetic card, IC card, etc., the radio frequency identification technology has many outstanding advantages: first, non-contact operation, long-distance recognition (several centimeters to tens of meters), Therefore, no manual intervention is required to complete the identification work, and the application is convenient. Secondly, there is no mechanical wear, long service life, and it can work in various harsh environments such as oil stains and dust pollution. Third, it can recognize high-speed moving objects and recognize multiple at the same time. Fourth, the reader has a physical interface that is not directly open to the end user to ensure its own security. Fifth, in addition to the password protection of the electronic tag, the data part can be managed by some algorithms. Sixth, there is a mutual authentication process between the reader and the tag to achieve secure communication and storage.
At present, RFID technology has been widely used in industrial automation, object tracking, traffic control management, anti-counterfeiting and military applications.
The RFID system consists of three parts:
Electronic tag (Tag):
It consists of coupling elements and chips, and each electronic tag has a globally unique identification number (ID) that cannot be modified or copied. This provides security. The electronic tag is attached to the object to identify the target object. The electronic label generally stores electronic data in an agreed format. In practical applications, the electronic label is attached to the surface of the object to be identified.
Antenna (Antenna)
The RF signal, that is, the data information of the tag, is transmitted between the tag and the reader.
Reader
Devices that read (or write) electronic tag information can be designed to be handheld or fixed.
The reader can read and recognize the electronic data stored in the electronic tag without contact, thereby achieving the purpose of automatically recognizing the object. Usually the reader is connected to the computer, and the read tag information is transmitted to the computer for further processing.
RFID features
(1) Data read and write (ReadWrite) function:
As long as the RFIDReader can be used, the information can be directly read into the database without any contact, and multiple tags can be processed at one time, and the status of the logistics processing can be written into the tag for the next stage of logistics processing.
(2) Shapes that are easy to miniaturize and diversify:
RFID is not limited in size and shape for reading, and it does not need to match the fixed size and print quality of the paper for reading accuracy. In addition, RFID electronic tags can be miniaturized and applied in different products. As a result, the production of the product can be controlled more flexibly, especially on the production line.
(3) Environmental resistance:
Paper can't be seen as soon as it gets dirty, but RFID has strong stain resistance to water, oil and drugs. RFID can also read data in dark or dirty environments.
(4) Reusable:
Since RFID is electronic data, it can be overwritten repeatedly, so it can be recycled and reused. For example, passive RFID can be used without a battery and there is no need for maintenance.
(5) Penetration:
Transmissive communication is also possible if RFID is covered with non-metallic or non-transparent materials such as paper, wood and plastic. However, if it is ferrous metal, communication will not be possible.
(6) The memory capacity of the data is large:
The data capacity will expand with the development of memory specifications, and the amount of data that will be carried in future items will become larger and larger, and the demand for capacity expansion of the volume label will increase, and RFID will not be restricted.
(7) System security:
Transferring product data from the central computer to the workpiece will provide security for the system and greatly improve system security.
(8) Data security:
The accuracy of the data stored in the radio frequency tag is ensured by means of verification or cyclic redundancy check.