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active tag
1. An RFID tag that has a transmitter to send back information, rather than reflecting back a signal from the reader, as a passive tag does.

Most active tags use a battery to transmit a signal to a reader; however, some tags can gather energy from other sources. Active tags can be read from 300 feet (100 meters) or more, but they're expensive (typically more than US$20 each).

They're used for tracking expensive items over long ranges; for example, the U.S. military uses active tags to track containers of supplies arriving in ports.

2. Also defined as an RFID tag that includes a battery for powering the microchip's circuitry and transmitting a signal to a reader. Active tags are not used in library RFID systems.
This entry is located in the following unit: Radio Frequency Identification (RFID): Definitions (page 1)