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Grounding problem (ADS Momentum)

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Jabu

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Hey there,

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

2.PNG

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

1.png

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).
 

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