sergio mariotti said:I think You should provide more details or requirements. Whithout more details the answer may be "it depend !"
I suppose such filter are used to prevent intermodulation of LNA.
If the low noise is a non-compromise request, you may place the filter just after a small gain LNA rather than fron-end.
I.e a 10 dB Gain LNA followed by a good but non excellent BPF may set the IIP3 in the +5...+10dBm range, wich is an excellent value.
Otherwise, as example, for professial use (I mean cost effective), a very low loss filter may be used, largest size combline, or waveguide, may loose less than 0.5dB for 30% BW.
One of the most exotic solution is the use of cryogenerator to cool down both a superconductive filter and the LNA. But, at present, the SC filter may be designed only with moderate BW and it's non-linear for very strong signals.
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