Semi-passive tags are similar to active tags in that they have their own power source, but the battery only powers the microchip and does not power the broadcasting of a signal. The response is usually powered by means of backscattering the RF energy from the reader, where energy is reflected back to the reader as with passive tags. An additional application for the battery is to power data storage.
Semi-passive tags have three main advantages:
1> greater sensitivity than passive tags;
2> longer battery powered life cycle than active tags;
3> they can perform active functions (such as temperature logging) under their own power, even when no reader is present for powering the circuitry.
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