Hi
If you are looking for a choke that works from 1M to all the way upto 3G- then one way I have seen people do that is connecting inductors in series such that each one of them work in separate bands (min impedance). To elaborate, lets say you have three inductors (L1, L2, L3) in series L1 works(Z>500say) at low freq, L2 in the middle of the band and L3 at the highest freq.
Usually a capacitor to ground, is added at the end to decouple. (I suspect it plays some role in compensating for L flatness as well).
Hope it was useful.