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in HL9.2 you will not get the AC cap behavior into the 3D solver. You either short the the cap pads to ignore the low frequency behavior or add ports to the capacitor pads. The second solution for a diff pait with two caps will end in a 8 port touchstone model. In a second step you connect the four capacitor ports in linesim with a capacitor model and extract the final 4 port touchstone model.