Active RFID tags have a battery, which is used to run the microchip's circuitry and to broadcast a signal to a reader
(the way a cell phone transmits signals to a base station). Passive tags have no battery. Instead, they draw power from the reader,
which sends out electromagnetic waves that induce a current in the tag's antenna. Semi-passive tags use a battery to run the chip's circuitry,
but communicate by drawing power from the reader. Active and semi-passive tags are useful for tracking high-value goods
that need to be scanned over long ranges, such as railway cars on a track, but they cost a dollar or more,
making them too expensive to put on low-cost items. Companies are focusing on passive UHF tags,
which cost under a 50 cents today in volumes of 1 million tags or more. Their read range isn't as far -- typcially less than 20 feet vs.
100 feet or more for active tags -- but they are far less expensive than active tags and can be disposed of with the product packaging
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