Are Passive Tags Detectable When Moving at Between 10 and 20 Meters Per Second?

By RFID Journal

  • TAGS
Ask The ExpertsAre Passive Tags Detectable When Moving at Between 10 and 20 Meters Per Second?
RFID Journal Staff asked 8 years ago
Is it possible to read a tag passing by at such a high speed?

—Name withheld

———


To answer your question, I reached out to an engineer at Impinj, which manufactures passive ultrahigh-frequency (UHF) RFID chips based on the EPC Gen 2 air-interface protocol. According to the engineer, if the read field is large enough, then it is possible to interrogate tags moving that quickly. The reason the size of the read field is critical is that if a tag is powered up for only a split-second, there is insufficient time for it to reflect back a signal with its encoded ID. Exactly how long the tag remains within the read field depends on a variety of factors, such as the tag IC and reader used, the reader antenna’s distance from the tag and so forth.

—Mark Roberti, Founder and Editor, RFID Journal

Login and post your comment!

Login
Register Now

Not a member?
Signup for an account now to access all of the features of RFIDJournal.com!

Previous Post

»