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Can someone please help me with any tutorials/pdf docs/websites/formula on how to build an inductor?

I need to create an inductor of 1.35mH .... but I would like it to have a reasonably large area... maybe a coil with a diameter of 20cm? And if there's any formulae or program that can do calculations for a PCB trace inductor?

(its to be used as an antenna in an RFID project)

Thanks for your help

Greg