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It's a very simple filter you are designing, I bet you are using LC filter designs. You need to tune inductances (coils) or capacitors (trimmers), or both. You should be able to obtain return loss better than 12 dB easily, if you try hard, you should be able to obtain 20 dB RL for such a simple...
There are many emprical formula to calculate Q0 for combline resonator, it's difficult to say which one is more accurate as Qo is a function of ground plane spacing, skin conductivity (silve plating), frequency, impedance, resonator loading, etc. Here is a simple one:
Q0=K*b*sqrt(f)
where K is...
It depends on what kind of resonator you have. Normally, metal cavity, such as combline resonator or an air coil inductor, has a higher unloaded Q at higher frequency, while dielectrics has a higher loss at higher frequency thus lower Q0.
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