RFID is a radio frequency identification technology, it is mainly through radio signals to identify a specific target, and can read and write data, but only one way to read.
RFID have low frequency (a few mm transmission distance), high frequency (13.56Mhz), ultra-high frequency, microwave frequency, etc., in different frequency bands, resulting in different power, resulting in different transmission distance.
NFC is a short-range wireless communications technology, the chip has the ability to communicate with each other, and computing power. NFC RFID can be seen as a subset, using a high frequency (13.56MHz) RFID standards, but it is a two-way process.
Common parts of NFC and RFID
NFC and RFID relationship is very close, lingering. NFC is a wireless communication technology based on RFID, and RFID it the same in the following two points.
First, NFC and RFID used the same frequency, are 13.56Mhz.
Second, communication theory NFC passive mode is similar to the principle of RFID and communication, are based on the principle of electromagnetic induction coupling radio frequency.
Although born out of RFID and NFC wireless Internet technology, NFC technology but, after all, it is a new technology for wireless communication with RFID there are still differences.
Difference between them based on two points
First, NFC technology to increase point to point communication functions, it can quickly establish a wireless communication between Bluetooth devices. NFC devices to find each other there by establishing a communication connection. In the communication mode, NFC different from the RFID network, which is built on a master-slave relationship under, and the chip passive way through the expensive and require energy to support the “read” device to read. The NFC device but can be set to passive and active modes, even in the case of equipment shutdowns under (passive mode), you can still transmit the identification data, it is precisely this characteristic makes it ideal for smart card applications. At the same time, it can also be in the active mode, and other active or passive RFID provided preparation of communication.
Secondly, NFC and RFID for different applications, in addition to the application point communications, the main applications of NFC mobile micro-payments. NFC applications for mobility characteristics for identification and data exchange, and the main purpose is to identify RFID.