ads inductor simulation

Hi,

I am trying to simulate a differential (symmetric) transformer (with a pattern ground plane) in ADS Momentum. I am having problems with the port assignment. I have assigned 2 sets of differential ports to the transformer ports. But I am not able to figure out what to do about the ground plane. If I try to add a ground port, it asks for a single/internal port, whereas I am using differential ports for the transformer. Kindly help!

SP

Do not assign any GND port.
Just carry the simulation.

http://www.designers-guide.org/Forum...1205240723/0#9

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