Active RFID tags differ from passive tags in that they have an internal power source. This source powers the integrated circuits and allows the active tags also to initiate data transmission, unlike passive tags that must be powered by a reader. Active tags are also much more reliable and can transmit at higher power levels. This makes active tags a
good choice for long range use (up to 300 feet) or for use in areas with high RF interference.
Some highly advanced active tags employ mesh routing technologies to relay signals from tags outside the reader's range.
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