I haven't been able to figure out this problem. I'm using Momentum to analyze layout with component models from Murata and Coilcraft. When I place them on the layout, they don't make a connection to traces and ports. If I disconnect components and short the traces, the simulation runs fine. I'm only debugging the connectivity from the component to the layout. Therefore, I'm using the simplest, two-layer substrate, a couple traces, and two ports. The layer names match. The component information area shows that its pads are connected to the correct net names. I even tried native ADS passives with layout artwork. Still no success. Aren't S-parameters embedded in the models? Can anyone comment? Thanks.