Radio Frequency Identification (RFID)
Radio Frequency ID (RFID) is a means of identifying and tracking objects using specially encoded tags.
- When an RFID reader scans a tag, the tag responds with the information programmed into it
- a tag can be either:
- an unpowered, passive device that only responds when scanned at close range (up to about 25 m)
- can be embedded in stickers and labels to track parcels and equipment
- or a powered, active device with a range of 100 m
- an unpowered, passive device that only responds when scanned at close range (up to about 25 m)
- also used to implement some types of access badge to operate electronic locks