RFID系统利用射频信号通过空间耦合进行双向信息传输，实现对待识别物体的自动识别和数据采集。
RFID systems achieve auto-identification and data-gathering of the object to be identified by utilizing space coupling of radio frequency signal to conduct two-way transmission of signals.
提出了三种实现信息双向传输的数字通信模型，分析了它们各自的特点和应用场合。
Three digital communication models to realize information dual-direction transmission are brought forward and their characteristics and applied situation are analyzed.
通信双方建立连接后可以双向传输文本信息和各种格式的文件，并且在双方对发文件的同时仍然可以进行双向的文本信息通信。
After the connection is created, the two sides can make a two-way transmission of both text message and files in all kinds of format.
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