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BlogsAsk The Experts ForumHow Much Electricity Is Generated by Passive RFID Tags?

How Much Electricity Is Generated by Passive RFID Tags?

Posted By RFID Journal, 09.03.2009
How much electricity (voltage and current) does a passive RFID transponder generate upon receiving a radio signal, and on which factors are a tag's electric power dependent?

—Jolene

———
I'm not an engineer, so I reached out to Roger Stewart, an independent consultant who has designed RFID integrated circuits for a number of companies. Here's his response: "The voltage and current generated in the tag increase if the tag is brought closer to the reader, but a modern passive tag is designed to operate (at maximum range) on only 1 microwatt of power—typically, at a power supply voltage of 1V with a current drain of about 1 microamp."

—Mark Roberti, Editor,
RFID Journal

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