Analysis of RFID Technology Application Scheme in Embedded Design!rfid pcb Dealer

　　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 field of inventory management, new developments in RFID tags and high-speed long-distance readers, embedded system designers can easily incorporate a variety of features, such as access control, anti-counterfeiting, simple payment, medical identification, dynamic pricing, product history , Long-distance asset turning and drying. 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 motor vehicles. Suiji 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 big technology in the basket. As early as during the Second World War, the Mozambican military used early forms of RFID to distinguish aircraft that sent me. The first commercial RFID applications appeared in the 1970s and 1980s to track and identify items in a single location. However, in the early days of RFID, many developers of RFID applications took proprietary technology as their basis, each of which used a unique communication method, and demanded that the label-producing company provide specialized reader hardware. . The lack of standardization has led to the fragmentation of the industry, the slow adoption rate, and the actual performance lags behind the publicity of RFID technology. Nowadays, developers are correcting most of the early-stage problems. RFID has also become a growing industry, with dedicated systems for logistics, access control, anti-counterfeiting, item-level inventory, contactless payment, and a variety of new embedded system applications. .

　　One of the most basic and common uses of RFID technology is the EAS (Electronic Commodity Anti-theft) system. Retailers use it to launch a high-tech ""war against shoplifting crimes."

　　This type of crime causes the industry to lose billions of dollars every year. The loss is so large that retailers can easily find reasons to buy an electronic system to burn theft. The EAS system uses large antenna boards and various sizes. The former is installed at store exits, and the latter is hung on high-risk goods. The basic principles of all EAS systems include the use of transmitters and receivers. The former creates electromagnetic fields in the store’s exit area, and the latter can detect electromagnetic fields. When passing through the exit, the small tuned circuit or magnetic material in the security tag will cause the electromagnetic field to change large enough so that the receiver can detect the change and activate the alarm. When the customer purchases the item, the clerk must remove the security The tag may be disabled to prevent the alarm from sounding when the customer leaves the store.

　　Reflection data

　　Developers who overpay newer RFID architectures all regard low-cost transponders (or tags) as the basis of the architecture. They consist of an IC for data storage and communication.

　　And an external antenna. There are two basic types of tags: passive and active. Passive tags do not contain a power source, and rely on the radio frequency signal from the reader to induce a small current in the antenna, which is sufficient to transmit a response signal. RFID tags transmit data by changing the reflected energy of the radio frequency signal from the reader. The working distance of passive tags can reach up to 30 feet, which depends on the power output, antenna structure, and working frequency of the sub-reader. BielomaTIk's RF-LoopTag is an expandable antenna device that also provides short-range and medium-range passive RFID tags.

　　You can use an active RFID tag with its own power supply (such as an internal battery) to show the chopsticks to extend the distance. Active tags can transmit data at a higher power level, and are generally better than passive feces

　　more acurrate. Active tags are generally used for high-priced items such as military vehicles or containers. The antenna structure of the RFID system depends on the application, the environment during reading, and the working frequency.

　　Government departments have allocated several frequency bands for RFID, but they are not uniform in the world. LF (low frequency) devices work in the range of 125kHz to 134kHz and are used in applications such as access control, animal identification, asset turnover, and car security key fobs. HF (High Frequency) 13.56MHz tags are used for applications where the reading distance is less than 3 feet. Unlike other frequency bands, HF tags are not susceptible to interference when transmitting data near metal or water. 860MHz~960MHz UHF (Ultra High Frequency) frequency band is very popular in new applications, because its reading distance is 3m~5mr and the data exchange speed is higher. Typical UHF applications include the drying of tea assets, where the tags are hung on pallets and containers, and when they pass through the entrance equipped with a reader, the operator can find them and make records.

　　In the past few years, Aozhong has worked hard to create a unified set of standards for labeling and reading Sao for each frequency band. ISO and IEC have created a number of RFID standards that include frequency, data encoding methods, and the use of RFID technology. For example, ISO/IEC14443 and 15693 standards define communication interface protocols for RFID tags used in payment systems, contactless smart cards, and proximity cards. ISO has also created standards for performance testing of RFID tags and readers. In addition, the ISO/IEC18000 series includes an automatic identification system for tracking supply chain loans and a dedicated air interface protocol for the goods management system.

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