I should use Transmission line based T network and see how close I can get to those required impedance values. It is related to broadband Matching.
As someone pointed out in the previous post, I could only think of matching from 50 ohm to the needed impedance at the center frequency of the band (sqrt(Fmin*Fmax)). Anyone has better Ideas? Thanks
I'm not sure if thats what you want, but you can use an RF switch(SP6T or something like that) with a couple nanosec~switch time; and design different matching networks covering different frequencies.