µÍ³É±¾¼¯³É½â¾ö·½°¸Ê¹ÐµÄNFCÎÞÏßÓ¦ÓóÌÐò

¡¡¡¡µÍ³É±¾¼¯³É½â¾ö·½°¸Ê¹ÐµÄNFCÎÞÏßÓ¦ÓóÌÐò

¡¡¡¡½ü³¡Í¨ÐÅ£¨NFC£©¼¼ÊõÒÑ¿ªÊ¼´ó¾Ù½ø¾üÒƶ¯Í¨ÐŲúÆ·£¬ÈçÊÖ»ú£¬ºÍÐí¶àÆäËûÓ¦Ó㬰üÀ¨ÖÇÄÜ¿¨¡¢ÏúÊÛµãÖնˡ¢¹«¹²½»Í¨Ö§¸¶¿¨¡¢×Ô¶¯ÊÛ»õ»ú¡¢¶©Æ±¡¢ÖÇÄܹã¸æº£±¨£¬ºÍ¸ü¶à¡£ÎªÁËÂú×ãÎÞÏßNFC½â¾ö·½°¸ÎÞ´¦²»ÔÚËùÐèµÄ³É±¾/¼Û¸ñµã£¬°ëµ¼Ì幩ӦÉ̺ÍϵͳÉè¼Æ×éÖ¯ÕýÔÚÖƶ¨¸ü¸ß¶È¼¯³ÉµÄ½â¾ö·½°¸£¬½µµÍϵͳ³É±¾²¢¼ò»¯ÏµÍ³ÊµÏÖ¡£

¡¡¡¡ÎÞÏßͨÐÅÓжàÖÖÑ¡Ôñ£¬Ã¿¸ö½ÚµãÖ®¼äÓв»Í¬µÄÊý¾ÝÍÌÍÂÁ¿·¶Î§ºÍÎïÀí¾àÀëÏÞÖÆ£¬Èçͼ1Ëùʾ¡£ÓÐЩÎÞÏß±ê×¼ÔÚijЩ·½ÃæÊÇÖصþµÄ£¬ÓÐЩ½«¾ßÓÐÏàͬµÄ·¶Î§»òÊý¾ÝÍÌÍÂÁ¿£¬ËùÒÔ×îÖÕÓ¦ÓóÌÐò½«ÔÚ¾ö¶¨Äĸö±ê×¼×îÊʺÏϵͳÖÐÆð×ÅÖØÒª×÷Óá£

¡¡¡¡

¡¡¡¡Figure 1£º Many wireless standards are available for designers to use in their system. For very-short range communications£¬ the NFC wireless standard can operate at distances of less than 20 cm£¬ vs. other standards that function over much larger distances. £¨Image courtesy of the NFC Forum.£©

¡¡¡¡NFC is a form of RFID£¬ but it has its own set of standards that govern its interface and operation. Vendors that design products to meet the standards will be able to link their products to and interoperate with any other NFC-enabled products. The NFC standards determine not only the contactless operating environment£¬ but also the data formats and data transfer rates.?

¡¡¡¡However£¬ before delving into the design of NFC systems£¬ we will review some of the basics of NFC operation. The NFC standard defines a short-range wireless connectivity capability that can carry secure two-way interactions between electronic devices. A simple communications link between two NFC devices is easy to establish and does not require any setup by users. Once established the NFC link allows users to access digital content£¬ perform contactless transactions£¬ and even connect electronic devices by placing devices close to each other.