Are you sure to have chosen the right project?The problem is that I have little knowledge of working with RF circuits
Years back a senior project group at my university did something like this to make an automatic cornhole scoring system. The platform had a loop antenna wound around its perimeter, and the bags had small loop antennas in them to detect the strong signal emitted by the platform. So long as the bags weren't sideways, or leaning up against the side of the platform, it seemed to work pretty well. Using an array of loop coils in the platform would likely give better results. I forget what frequency they operated at, but it was definitely low enough that they could ignore wave propagation effects, which makes things a lot easier.I'm not sure of the circumstances this would be used in but a possibility might be to surround the perimeter (inclusion zone) with a loop antenna and use a low powered transmitter in the bracelet. It still wouldn't be foolproof but it would make it more difficult to create 'dead spots' at any point within the loop. You could also consider RFID technology, especially if there might be more than one bracelet within the detection range.
must detect when the wearer is more than x (say 10 foot) from a certain point
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