3 layer simulation in ADS

hi ...i have to model a 3 layer PCB.....my layers should be in the following way....
free space
cond1(micro strip)
substrate
ground
substrate
cond2(microstrip)
free space
how to model this in ADS momentum and i also want coupling between cond1 and cond2 .....how to define the layers.....

If you put an ideal ground plane between the two substrates, there will be no coupling between them.
You have to put slots on the ground plane or vias between cond and cond2
Good luck

ideal ground plance ( between two layers ) is not posible to model in ADS.

It will exit either on top side or bottom side.

I suggest more study on ADS momentum manual on substrate definition,layers etc.

You can create a slot type layer between the two signal planes, then the slot type layer will be considered to be an infinite ground plane.