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Application of RFID tag in EAS system

EAS (Electronic Article Surveillance), also known as electronic commodity anti-theft system, is one of the commodity security measures widely used in the retail industry. It is a high-tech electronic anti-theft device, which uses high-tech means to give goods a kind of self-defense ability, which can effectively protect goods and prevent goods from being stolen. In foreign countries, 90% of retail businesses use EAS systems to reduce theft rate. In China, the EAS system is the most reliable and economical high-tech management method to reduce theft and loss.

A typical EAS system generally consists of three parts: 1) electronic sensors attached to the goods; 2) electronic sensor control devices to allow normal entry and exit of authorized goods; 3) monitors, which emit a certain amount of radiation within a certain area of the exit Surveillance space.

The working principle of the EAS system is: In the surveillance area, the transmitter transmits a signal to the receiver at a certain frequency. Transmitters and receivers are generally installed at the entrances and exits of retail stores and libraries to form a certain surveillance space. When a tag with special characteristics enters the area, it will interfere with the signal sent by the transmitter. This interference signal will also be received by the receiver, and then after the analysis and judgment of the microprocessor, it will control the sound of the alarm.

According to the detection signal method of the application, it can be divided into different types such as radio system, electromagnetic wave system, microwave system, frequency division system, intelligent system and acousto-magnetic system. At present, the EAS system has also been widely used in major shopping malls, bookstores, and libraries in China. Its basic working principle is as follows:

(1) Attach the magnetic strip to the product.

(2) Install a detector at the exit passage of the mall.

(3) The authorized product is degaussed by a dedicated degausser to make the magnetic strip invalid.

(4) When unauthorized goods (not demagnetized) pass through the exit, the access control detector detects and sends out an alarm to intercept the exit of the goods.

RFID is classified according to frequency. There are low frequency, high frequency, ultra high frequency, microwave and other RFIDs, which have their own strengths in different application fields. This article only describes the EAS technology involved in ultra-high frequency (UHF) RFID that has broad application prospects in the fields of warehousing and logistics, retail, book management, and intelligent transportation.

Take a large-scale retail application as an example. If UHF RFID technology is used for quick and easy access management of goods, while the original EAS system is used for access monitoring, it will inevitably cause two systems to exist at the same time, resulting in waste, not to mention the management. Bring difficulties and increase the operating costs of businesses.

Because the ISO18000-6C protocol does not stipulate the relevant standards of EAS, different electronic label chip design companies have different considerations in the design of EAS.



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