can't view s11 of double diplexed filter? If I terminate into separate outputs, it works...?
I think the simulation is working correctly but you are getting interaction with the two BPFs that are tied together. Those are 50ohm filters being paralleled together and terminations are set to 50ohms on either end. 25ohms would seem better but its still not right when I do that. All of the filters are interacting as setup.
Maybe the filter "type" setting is having an impact???
In the case of a LP/HP diplexer you would want each filter to begin with a series element. I am not sure how genesys implements in using their filter models because I don't see the filter type setting in your design. I am assuming it is defaulting to 1?
In any case I think you should focus on getting the two filters in parallel to work first and go from there.
Retrieving data ...