What is RFID and how does it work?
Ravi Mathur: Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. An RFID tag is a small object that can be attached to or incorporated into a product, animal, or person. RFID tags contain silicon chips and antennas to enable them to receive and respond to radio-frequency queries from an RFID transceiver. Passive tags require no internal power source, whereas active tags require a power source. How has this technology evolved since its origin? The technology appeared during the Second World War, when the radar was invented. During World War II the British, understandably, desired to be able to distinguish between their own returning aircraft and those of the enemy since the coast of occupied France was less than 25 miles away. A system was developed, called Identify: Friend or Foe system (IFF), which distinguished a “friendly” aircraft from a “foe”. Here, a transponde
