Chapter 5
UHF RFID Tags
5.1 Power and Powerlessness
Tags identify objects. When the objects are very expensive, the cost of the tags is of little consequence, but their endurance is of great import, since expensive objects, and our interest in them, are usually also long-lived. When the objects are cheap, the tags must be cheaper. These are the fundamental dynamics of tag design.
As a consequence, tags that are intended to label long-lived, expensive objects (typically viewed as assets on someone’s books) are usually active tags, with their own radio transmitter and receiver, powered by a local battery. Since battery technology has progressed very slowly relative to semiconductor technology, the key issues in designing a passive tag are to minimize ...
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