microstrip filter design in ADS

hi
i am trying to simulate a microstrip filter using ADS. during optimization am facing some problems with the goal controllers used.
can any of you offer some idea.

What's your problem? Can you give more detail?

am using 3 goal controllers and 1 optim controller in ADS in simulating coupled stages of microstrip filter. when i simulate using s-parameter simulation the error occurs at optim goal.

Hi immaculate

Have you use constrains (limits) on your variables? Some formulas in microstrip models won't work if ratios of w/s/h/t/Er are not within specified limits (formulas not valid).

flyhigh

Could you pls paste your goal and optim controller?