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Define Ground Reference in Substrate in GSG-CPW design in Momentum Simulat

Question asked by jaz on Dec 18, 2012

I am slightly confuse about what ground reference plane i should define in momentum, substrate layer to simulate for GSG type of CPW design. To illustrate the design, it is high speed trace of ground-signal-ground configuration. Conventionally, i always use the bottom most layer as "cover" ground reference assuming the bottom ground plane. However, for GSG type of CPW design, if i am not wrong there are guided waves ground effect from both the G to S trace. So, do i need to define both ground plane in Momentum? and if yes, how should i define both the ground plane? I am using ADS2011. I am alright with ADS 2009 as well.

Thank you