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Is is possible, and if so, is it viable, to use UHF RFID RSSI to measure distance in the 1-25 millimeter range from the RFID Reader antenna with a resolution down to below half a millimeter?

If it is, could anyone offer some hardware tips to make this work reliably?

Any insight would be appreciated, as we are concerned that the tolerances in the hardware will render this impossible.

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closed as too broad by Chris Stratton, Sparky256, Finbarr, JYelton, duskwuff Feb 17 at 3:58

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ I will be amazed if this is possible, and even more so if it's reliable. \$\endgroup\$ – Hearth Feb 11 at 23:12
  • \$\begingroup\$ Why do you think that RFID would be a suitable technology for your application? It wasn't designed for what you wish to do. \$\endgroup\$ – Transistor Feb 11 at 23:25
  • \$\begingroup\$ I don't think it would be suitable, but our design will have it anyway so we thought to investigate it. \$\endgroup\$ – Brian Feb 11 at 23:27
  • \$\begingroup\$ Bubble wrap wasn't designed for its most popular application (it was designed as wallpaper), but that doesn't stop us using it where it works. My question explores the viability of using an existing technology for a different purpose. Maybe it is viable, maybe not. That's what prompted me to ask the question. \$\endgroup\$ – Brian Feb 11 at 23:29
  • \$\begingroup\$ I have seen a few articles and published papers that use RSSI in item location applications, but those distances are in meters, not millimeters. \$\endgroup\$ – Brian Feb 11 at 23:31
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Someone appears to have published a thesis getting measurements on the order of 200mm here: https://ris.utwente.nl/ws/portalfiles/portal/13263925/thesis_J_Huiting.pdf

So, it might be possible, but would probably earn you a degree if you pulled it off.

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