How to define ground plane in Momentum substrate definition

Could someone please show me how to properly define the ground plane in the substrate definition of Momentum? I am trying to do a simple simulation of a 28GHz 50-ohm microstrip/stripline in ADS and compare the S11 result with that from Momentum for different R4035B substrate thickness. However, I am having difficulty getting the result of this simple simulation to match -- it seems that my ground plane in the substrate definition of Momentum is not done properly. Thank you for your help.

In most cases, we leave the substrate backside as the boundary condition, with material "perfect conductor". That is pretty accurate because losses in the ground are small compared to losses in the signal trace.

You can use the "Alumina" template to see what that looks like.

Thank you very much Volker for your help and reply. I tried the method you mentioned and it works for me. I also did more digging and found the following very good article on the internet which very well explains the different ways of defining the ground plane in Momentum: (1) cover, (2) strip plane (finite ground), and (3) slot plane (infinite ground). Hope others find it helpful.

https://abhargava.files.wordpress.com/2015/09/strip_slot_emsimulations.pdf:https://abhargava.files.wordpress.com/2015/09/strip_slot_emsimulations.pdf

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