Around a fixed point, X, an action needs to be performed on a small mobile electrical battery-powered component as soon as it has exceeded that distance from point X. Is there an RFID solution for this scenario?
If you need to trigger an action the moment a component moves precisely 30 centimeters in any direction, this is probably not feasible, as radio waves are affected by environmental conditions. You could set up an omnidirectional reader, but it would be difficult or even impossible to get it to read at exactly 30 centimeters in every direction. There might be rebar in the floor or a lighting fixture that would cause the radio waves to bounce and read the tag a centimeter or two early or late. If the environment is completely controlled, then it might be possible with an HF reader, but I am unaware of any omnidirectional HF reader on the market.
—Mark Roberti, Founder and Editor, RFID Journal
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