IC697MEM717

IC697MEM717

IC697MEM717

1.3RFID技術(shù)的工作原理

　　RFID技術(shù)的基本工作原理并不復(fù)雜：標(biāo)簽進(jìn)入磁場(chǎng)后，射頻前端發(fā)出的射頻信號(hào)，憑借感應(yīng)電流所獲得的能量發(fā)送出存儲(chǔ)在芯片中的產(chǎn)品信息（PassiveTag，無(wú)源標(biāo)簽或被動(dòng)標(biāo)簽），或者主動(dòng)發(fā)送某一頻率的信號(hào)（ActiveTag，有源標(biāo)簽或主動(dòng)標(biāo)簽）;讀取信息并解碼后，送至RFID射頻識(shí)別控制單元進(jìn)行有關(guān)數(shù)據(jù)處理。

　　2射頻識(shí)別節(jié)點(diǎn)的硬件設(shè)計(jì)

　　2.1射頻識(shí)別節(jié)點(diǎn)的結(jié)構(gòu)

　　如圖1為射頻識(shí)別節(jié)點(diǎn)的結(jié)構(gòu)：它包括：1）USB轉(zhuǎn)串口單元;2）RFID射頻識(shí)別控制單元;3）RFID讀頭前端單元;4）和無(wú)線射頻收發(fā)單元。射頻前端和標(biāo)簽間一般采用半雙工通信方式進(jìn)行信息交換，同時(shí)通過(guò)耦合給無(wú)源應(yīng)答器提供能量和時(shí)序。在實(shí)際應(yīng)用中，可進(jìn)一步通過(guò)Eth-ernet或WLAN等實(shí)現(xiàn)對(duì)物體識(shí)別信息的采集、處理及遠(yuǎn)程傳送等管理功能。

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