Near Field Communication (NFC) is a new technology. Devices using NFC technology (such as mobile phones) can exchange data when they are close to each other. It is developed from the integration of contactless radio frequency identification (RFID) and internet technology. By integrating the functions of sensor card reader, sensor card and point-to-point communication on one chip, the functions of mobile payment, electronic ticketing, access control and mobile identity are realized by using mobile terminals.
NFC is called near field communication technology in Chinese. NFC is developed on the basis of non-contact radio frequency identification (RFID) technology combined with wireless interconnection technology, which provides a very safe and fast communication mode for various electronic products that are becoming more and more popular in our daily life. The "near field" in the Chinese name of NFC refers to the radio waves near the electromagnetic field. Because radio waves are actually electromagnetic waves, it follows Maxwell's equation, and the electric field and magnetic field will alternate energy conversion in the process of propagating from the transmitting antenna to the receiving antenna, and strengthen each other in the conversion process. For example, the radio signals used by our mobile phones are spread by this principle, which is called far-field communication. In the electromagnetic wave of 10 wavelength, the electric field and magnetic field are independent of each other. At this time, the electric field has little significance, but the magnetic field can be used for short-distance communication, which we call near-field communication.
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