Imho your problem will be the board material not the inductor proper. At that
frequency on FR board inductors are more or less transmission lines that need a
little more capacitive loading at the ends to get them into range. The 'normal'
way to get over this is to approximate an inductor (one turn or part thereof)
and a place for a SMD cap at its end (closure) and build it and measure it.
Rinse & repeat until it starts working. Things like trace proximity (including
to iself - as in spiral or meander) can change the frequency by 1-3% (10MHz off
at 400MHz).

Peter P.


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