Grounding problem (ADS Momentum)

Hey there,

Just started to do EM simulation with ADS Momentum. Simulation results of a simple microstrip line (lambda/4 @ ~90GHz) looks like this:

I defined 2 Ports using 4 Pins for excitation. You can see the standing waves on the ground plane at all lambda/4.

How can I solve this grounding problem? Is it an issue of my simulation setup? I expect a non resonant behaviour for a simple piece of microstrip...

Jabu

This is reality, your finite ground structure starts radiating.

If you want to have an ideal ground, use the bottom boundary condition (substrate backside).

Tried to figure out how to do that - where can I find that setting?

This is infinite ground as a boundary condition

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