How does an NFC smart card work?

Posted by sere on March 6th, 2020

NFC is a kind of contactless identification and interconnection technology, I believe many friends want to know the specific working principle of NFC smart card is what kind of? Wanlian series with you to understand the NFC smart card NFC technology principle.

NFC smart card NFC technology principle

NFC smart card technology can quickly and automatically set up wireless networks, providing a "virtual connection" for cellular, bluetooth or WiFi devices to communicate over short distances, suitable for communication between mobile devices, consumer electronics, PCS and smart controls.

The NFC smart card occurs between the initiating device and the target device. Any NFC device can be the initiating device or the target device. They are coupled by ac magnetic field, and are modulated by ASK or FSK to transmit digital signal. The initiating device generates a radio frequency magnetic field to initialize (modulation scheme, coding, transmission speed and RF interface frame format); The target device responds to the command issued by the initiating device and chooses the radio-frequency magnetic field emitted by the initiating device or generated by itself for communication.

Both NFC smart card and Bluetooth are short-range communication technologies, but NFC does not require complex setup procedures and can simplify Bluetooth connectivity. What makes NFC better than bluetooth is that it's easy to set up. Data connection via NFC is much faster than creating a connection manually, taking less than a tenth of a second. Two NFC devices are close enough to each other to transmit data with a beep. In addition, for the implementation of functions such as swiping CARDS for payment, exchanging business CARDS and opening doors, NFC is much more than Wifi and bluetooth. The charm of NFC lies in simplifying many things.

For mobile phones or mobile consumer electronics, NFC smart card is much easier to use. NFC power consumption is low, only connected to one machine at a time, with a high level of confidentiality and security, very helpful to avoid credit card transactions stolen. Although NFC smart card is not as fast and distant as bluetooth (less than 20 cm), the goal of NFC is not to replace bluetooth or other wireless technologies, but to complement each other in different situations and areas.