What is the detection range for RFID tags?
The read range of passive tags (tags without batteries) depends on many factors: the frequency of operation, the power of the reader, whether repeaters are used, and interference from metal, water or other RF devices. In general, low-frequency tags have a range of a foot or less. High frequency tags have a range of about three feet and UHF tags can be read from 10 to 20 feet. When longer ranges are needed, such as for tracking railway cars, active tags (tags that use batteries to boost the signal) have read ranges up to 300 feet or more.