Who can tell me what an RFID tag is?

The most basic RFID system consists of three parts: electronic tag, reader and antenna;

Electronic tag: It is composed of coupling elements and chips, and each tag has a unique electronic code, namely ID number. Attaching to an object to identify a target object; When the electronic tag enters the RF signal area (electromagnetic field) generated by the reader antenna, it gains energy and then sends the stored information and data to the reader. Sometimes called radio frequency card, transponder.

Reader: sometimes called interrogator, communicator or reading device, it is used to generate and transmit radio frequency signals, receive radio frequency signals reflected by electronic tags, that is, electronic tag data, and obtain electronic tag data information after processing. At the same time, user data information can also be written into the electronic tag through the reader. The reader can be designed as handheld or stationary.

Antenna: It transmits RF signals between the electronic tag and the reader.