The letters RFID stand for "radio frequency identification." An RFID tag, which can be embedded in a security card or placed on a packaging label, gives off a radio signal that is picked up by antennae in the reading devices.
The simplest system can be comprised of a mobile handheld RFID reader (with an integrated antenna) and RFID tags, while more complex systems are designed using multi-port readers, GPIO boxes, additional functionality devices (e.g. stack lights), multiple antennas and cables, RFID tags, and a complete software setup.
Sep 15, 2020 · Top, modern RFID reader/writer modules can be squeezed onto extremely small PCBs. An example is the the Elatec TWN4 MultiTech Nano, a 31×17.8×2.5-mm/1.22×0.7×0.12-in RFID/NFC module. Its small size allows integration into machines with limited space such as handheld readers, tablets, displays, terminals and POS systems.