Analysis of RFID Technology Application Scheme in Embedded Design

　　RFID (Radio Frequency Identification) technology has the potential to become a common and important part of embedded system design. In addition to the traditional role in the inventory management field, new developments in RFID tags and high-speed long-distance readers allow embedded system designers to easily incorporate a variety of features, such as access control, anti-counterfeiting, simple payment, medical identification, dynamic pricing, product history , Remote asset tracking. Embedded RFID applications generally include readers in products or systems in order to add local data collection features, which enhance the basic functions of the product. Today, people will find embedded RFID applications in hotels, prisons, hospitals, retail outlets, farms, casinos, toll roads, factories, and a variety of commercial and military vehicles. As embedded system developers recognize the value of this technology and adopt it in new designs, these non-traditional RFID applications will become commonplace.

　　The idea of RFID appeared in the middle of the 20th century, and now, it is about to become the next major technology. As early as World War II, the US military used early forms of RFID to distinguish between enemy and friendly aircraft. The first commercial RFID applications appeared in the 1970s and 1980s to track and identify items in a single location. However, in the early deployment of RFID, many developers of RFID applications use proprietary technology as their basis, each of which uses a unique communication method and requires the company that produces the tag to provide specialized reader hardware. The lack of standardization has led to fragmentation of the industry, slow adoption, and the actual performance lags behind the hype about RFID technology. Today, developers are correcting most of the early problems, and RFID has become a growing industry, with dedicated systems for logistics, access control, anti-counterfeiting, item-level inventory, contactless payments, and a variety of new embedded system applications .

　　One of the most basic and common uses of RFID technology is the EAS (Electronic Commodity Security) system. Retailers use it to launch a high-tech "war" against shoplifting crime. This type of crime causes the industry to lose billions of dollars each year. The loss is so large that retailers can easily find reasons to buy expensive electronic systems to curb theft. The EAS system uses large antenna boards and security tags of various sizes. The former is installed at store exits and the latter is hung on high-risk commodities. The basic principles of all EAS systems include the use of transmitters and receivers. The former creates an electromagnetic field in the exit area of the store, and the latter can detect changes in the electromagnetic field. When passing through the exit, the small tuned circuit or magnetic material in the security tag will cause a sufficiently large change in the electromagnetic field so that the receiver can detect the change and activate an alarm. When a customer purchases an item, the clerk must remove or disable the security tag to prevent the alarm from sounding when the customer leaves the store.

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