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What Are Some Ambient Sources of Energy for Passive Tags?
Are vibration and solar energies viable power sources? And how widely have they been deployed?
The sole source of energy for a passive tag is RF energy from a reader antenna. The definition of a passive tag is a tag with no power source of its own. There are tags that use sunlight, vibration and even energy from living trees (see Forest-Monitoring Sensors Harvest Energy From Trees), but these have not been widely deployed. Most companies utilize either passive tags, battery-assisted passive (BAP) tags or active tags with a battery.
—Mark Roberti, Founder and Editor, RFID Journal
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