Distance between tags

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This topic contains 1 reply, has 2 voices, and was last updated by  Greg Pitner 2 weeks, 4 days ago.

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  • #1289

    Hunter Gipson
    Community Member
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    I am using RFM2100-ARF temperature sensors and the ThingMagic Astra-EX reader. In my testing there are 20 sensors in a small area of approximately 6 square feet. In my data there have been some sensors that have not reported data due to the shadowing from the other sensors. Is there a recommended minimum distance for spacing the sensors?

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    #1290

    Greg Pitner
    RFMicron Team Member
    • ★★★★

    Hi Hunter — tags can indeed become more difficult to read if they are placed close together, and the tag density you have is in the ballpark where this can be a problem. Setting a minimum distance is tricky because it can depend on the environment, the orientation of the tags, exactly how much read degradation is tolerable, and so on. But in general, tags should be well isolated from each other when they are at least a wavelength apart (about a foot). You can often get away with somewhat closer spacing, but, like I mentioned, it all depends. It often helps to orient tags perpendicularly to each other if you are trying to reduce spacing.

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