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BlogsAsk The Experts ForumCan RFID Determine Whether People Are Arriving or Leaving?

Can RFID Determine Whether People Are Arriving or Leaving?

Posted By RFID Journal, 07.24.2015

I would like to create a kit that uses ultrahigh-frequency (UHF) RFID to detect if a person is entering or exiting a room. I want to place two antennas next to each other, and then ascertain which antenna detects a tag earlier. Will this work?

—Name withheld

———

Yes, this should work, provided the tag can be read consistently. The challenge is that the human body is mostly composed of water, which absorbs RF energy in the UHF spectrum. So a person's body can sometimes prevent tags from being consistently interrogated. But if a tag is read consistently, then a reader can be set up to report which antenna picked up that tag's signal first, which should indicate the direction in which the tag (and thus the person) is moving.

—Mark Roberti, Founder and Editor, RFID Journal

USER COMMENTS

Jason Pitcock 2015-08-18 04:21:31 PM
We have had great success using a battery assisted passive ID card/badge. Please send us an email if you would like to schedule a demonstration! jplrfid.com
Suresh SAWHNEY 2015-08-19 04:11:55 AM
Not only can this be done, we are already utilizing our algorithms for live customers utilizing our solutions . The same principal is possible for store houses with Portals, Laptop Tracking etc. We have special ID cards developed which will be read in the bi-directional mode as desired by you. Please feel free to visit our website - www.dolphinrfid.in .

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