What Is RFID?
RFID can identify and locate objects automatically and without contact using electromagnetic waves. A functioning system always consists of a transponder and a reader. A transponder is a microchip with an antenna or coil that picks up the electromagnetic waves from a reader and transmits the data. The transponder can actively transmit data if equipped with a battery. Without its own power supply, it depends on a reader's electromagnetic field. Therefore, there are two types of transponders: active and passive.