I want to know how you calculate the Q factor? Thanks.Hello,
10 MHz BW at 1 GHz with the 40 dB attenuation requires resonators with a Q factor of over 200. Therefore any technology that is not able to make resonators with Q>200, will not result in a filter.
3dB Bandwidth is 15MHz, so Q factor will be 66 that is realizable with MS structures.
RFWimp how to calcilate Unloades Q from simulation can u provide some insight into it..... because it will save a lot of time of mine to search the Q values of many types of reonatorsTony_lth: Calculation of Q factor is possible for some simple geometry based on (empirical) formulas or analysis. For difficult geometry (change in cross section, bends, partly in air, partly in dielectric, calculation is virtually impossible. In that case you have to go for simulation and measurement.
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It is necessary to design such filter? There are good SAW filters like 802-RF1000.0M-A Oscilent.
1GHz bandpass with 10MHz BW is a challenge, and now you want to tune it? 8O
I think that you should consider YIG filters or re-design your system arechitecture.
YIG filter example data: https://www.omniyig.com/content/datasheets/YIGFilt_ALL.pdf
Before everyone gets all certain about what can and can not be done at 1 GHz for a BPF, here is one at 9.9 Ghz with 12.5 Mhz bandwidth:
Do you know what is inside of this box? I do not.
Either I do not know and I agree with volker_muehlhaus take it we can take any conclusions for 1GHz microstrip filter from your example.originaly posted by biff44
Do you know what is inside of this box? I do not. It could easily be a suspended substrate type filter, as filtronic is known for.
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