> That is true for band pass filters but in the case of a > duplexer the filters are usually notch type (or pass/notch).
In some but not all cases. I have a few shelves full of band-pass only mode duplexers and they have their very useful applications. > So the more notch type cans there are the wider the notch > will be at some given frequency. Not sure if I buy the above statement as in-stone fact. > Note that the pass response of a band pass / reject type > duplexer is very wide to start with. Doesn't have to be... it directly depends on the Q of the cavities and how the duplexer is designed and set up. cheers, s.
