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BlogsAsk The Experts ForumDo Any RFID Tags Have Anti-collision Features?

Do Any RFID Tags Have Anti-collision Features?

Posted By RFID Journal, 04.15.2014

What exactly is tag collision, and how is it avoided?

—Name withheld


Virtually all RFID transponders support some kind of anti-collision algorithm. Tag collision is when two tags try to respond to signals from a reader at the same time. The reader cannot differentiate the signals and, without an anti-collision algorithm, would not be able to interrogate either tag, rendering the system useless any time that more than one tag was in the read field.

There are a variety of methods for preventing tag collisions, but all do essentially the same thing: They make it possible for tags to respond to a reader one at a time. The algorithm used is usually part of the air-interface protocol standard—the "language" that tags and readers use to communicate.

—Mark Roberti, Founder and Editor, RFID Journal


soo sip boon 2018-01-14 11:16:40 PM
May i know the anti collision is a feature on tag or reader? I have a impinj R2000 chip reader, their white paper basically just stated the DBM anti collision feature, but non of the document had stated any tag collision... is it something that we need to program it in the application or firmware?

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