EM simulation of PCB CPWG

Hello guys!

I am new to ADS and EM simulations in general, so sorry if I ask some stupid questions.

I am trying to design a PCB with ~5 cm lines which run from 1 surface SMA to another. Simple point to point connection.

I designed the layout of 1 line in Circuit Maker and exported it as ODB data base to ADS.So far everything is good.

In ADS I want to simulate it and see S-parameters in a given frequency range of 1-15GHz.

My design is attached, blue polygon is a ground plane and green lines are top layer.

I have some problems with port definitions, since I am getting warnings for electrically large distance between the ports.

I defined area pins (see picture number two) for the signal and the landing zones of the SMA connector. But I do not know how to defined a ground plane (bottom layer) to act as a reference layer for all the ports.

I tried to do the CPWG tutorial of ADS, but there they use only one metal layer and ideal infinite ground reference plane.

Please advice!

Thank you in advance!

A port for ADS Momentum consists of two pins, a positive pin and a negative pin. (There are some cases where you might define two negative pins, for a symmetrical port.) If your ground reference is on an infinite ground plane (cover), the negative pin will show up as "Gnd" in the emSetup, Port branch. If your ground reference is on a finite ground plane (your case), you will need to define this plane, i.e. draw it on a layout layer and map it to the substrate. If you require more assistance, please contact your local Technical Support department.

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