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How Can We Control Cross-Talks via RFID?

Posted By RFID Journal, 05.09.2018

We use fixed RFID readers and antennas in our toll booths. Sometime, booth one's antenna reads booth two's vehicle tags. Can you please suggest a solution to this problem?




You could change the angle of the reader antenna to point down more, which might solve the problem. You might also be able to attenuate each antenna so that it would be strong enough to read tags on cars in a specific lane, but not powerful enough to read those in the adjacent lanes. If those options don't work, you would need to put shielding between the lanes to prevent the signal from reaching the tags in the other lanes. There are several companies, such as MWT Materials, that sell curtains for blocking RF signals.

—Mark Roberti, Founder and Editor, RFID Journal


Ron Marino 2018-05-10 12:21:46 PM
A more directive reader antenna may also work (higher gain and narrower beamwidth). Could try arraying two of your antennas side by side with a splitter. May exceed FCC antenna gain limit and may have to lower power though. This would focus the beam and provide more power where you want it and less in adjacent lanes.
James E. Heurich 2018-05-10 12:24:11 PM
RFID, Inc. has patented Reader firmware whereby the user can execute a command to read a Tag x number of times in y amount of seconds before reporting the Tag, for example read a Tag 5x in 2 seconds before reporting. A Tag off to one side or the other will not report as often, and even if the Reader is tuned down or a lesser strength Antenna is installed, guess what, a Tag that is 50' away is going to report once a day, that's the volatility of RF. Also, a vertical polarized Antenna can be installed so as to not sense Tags left/right as much as circular or horizontal Antennas, but still, errant reports will occur.
Marc Grun 2018-10-18 07:18:38 AM
MWT Materials makes a rubbery self adhesive RFID absorber that can be attached to the outer side edges of RFID antennas. Wrapping antennas in an RFID absorber has proven an effective way of forming the beam that suppresses the antenna's side lobes and reduces reads where you don't want them. Contact us if interested. www.mwtmaterials.com

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