What Is the Fastest Acceptable or Reliable Response Time for a UHF Reader to Interrogate a Tag?

By RFID Journal

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Ask The ExpertsWhat Is the Fastest Acceptable or Reliable Response Time for a UHF Reader to Interrogate a Tag?
RFID Journal Staff asked 9 years ago
What would that time be, in seconds?

—Name withheld

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I am unsure what you mean by “fastest acceptable or reliable.” The EPC Gen 2 RFID protocol calls for tags to be read at a rate of 850 times per second under the Federal Communication Commission‘s RF restrictions, and 450 times per second under ETSI rules. To comply with the standard, a user would have to be able to encode 5 tags per second.

These are theoretical speeds that were required in 2004, when the protocol was created. The technology has since become much better, and much faster. AT RFID Journal LIVE! 2012, being held next week in Orlando, Fla., Impinj and NXP Semiconductors will explain how they can encode tags at a rate of 50 per second or higher.

Having a high number of tags within a small read field, or having tags embedded in dense material, can slow down read rate, as it takes time to walk through an anti-collision protocol and energize tags embedded in thick dense material.

I hope that answers your questions.

—Mark Roberti, Founder and Editor, RFID Journal

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