Hello,

I'm working on a transmitter and receiver in the 400MHz range. The
inductors in that frequency range are really small (tens of nH) and I
thought that buying such an inductor may not make much sense. So I looked
into PCB and air core inductors. Here's what I found so far:

<http://www.educypedia.be/electronics/electroniccalculatorcomp.htm> Lots of
links to all kinds of calculator sites.

<http://emcsun.ece.umr.edu/new-induct/> Inductor calculations for all kinds
of geometries, but not PCB spirals.

<http://smirc.stanford.edu/spiralCalc.html> Calculator for integrated
spiral inductors; may work for PCB inductors also, but I don't know what
they assume in terms of what's around the conductor.

<http://tinyurl.com/2rn89n> A paper by Marc T. Thompson listing a number of
formulas for PCB and wire coils.

<http://www.freelists.org/archives/si-list/11-2001/msg00109.html> Steve
Rogers, who seems to have done some work with PCB inductors, lists a number
of sources of information and describes some of the potential problems with
PCB inductors. 


Has anybody experience with PCB inductors? Or maybe even with a
formula/calculator that yields realistic results? Are simple air core
inductors much easier to get right?

Thanks,
Gerhard

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