How might I avoid one reader interfering with another?
First, let me point out that many passive UHF RFID readers have two, four or even eight ports for connecting up to eight antennas. So it is quite possible that you could cover a door with a single reader. This would be preferable to utilizing two readers, because it would be less expensive and the reader would emit energy from one antenna at a time in rapid succession. You would not need to worry about one reader interfering with another.
If, for some reason, you didn’t want to employ a single reader with multiple antennas, it would be possible to use two readers on the same door. This would require setting up a timing mechanism so that the two devices would not read tags at exactly the same moment. If they did, they would interfere with one another and you would not be able to read the tags. A good systems integrator could set this up for you, but I still believe the single reader is a better approach.
—Mark Roberti, Founder and Editor, RFID Journal
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