![]() The low-pass prototype people usually use is Chebyshev because it has a good tradeoff between out of band and in band performance, but others exist like elliptical, etc. This means that the higher your Qu, the lower your loss the higher your fractional bandwidth, the lower your loss the higher your filter order, the higher your loss.Ģ*) From these specs, you generate what are called low pass prototype values. The insertion loss is roughly inversely proportional to the unloaded Q of your resonators and your fractional bandwidth and proportional to the filter order (number of resonators) i.e. ![]() ![]() Center frequency and fractional bandwidth are generally dictated by your application but then you have the insertion loss of your filter. To design a filter, the process flow is generally something like the following:ĭetermine filter specs.
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