Learning Forum

[vagadiya]

I am working on edge couple microstrip, which is inside solution space. For that I can not use wave port and I have to use lumped port. I am using 4 terminal lumped ports and then I define 2 differential lines D1 and D2. Now my question is how can I short-circuit my top ground plane and bottom ground plane? Without short-circuit this ground planes it doesn't make any sence. Thank you.

[Takeshi Itadani]

If you want to place a Wave Port inside the analysis space, you can perform the analysis by touching one side of the Wave Port to a pec object.
If you are using version 2021R2 or later, a setting has been added to automatically create a pec object.

[vagadiya]

Thank you for your reply. Is there any way that I can do this with lumped port?

[Takeshi Itadani]

Lumped Ports are originally placed within the analysis space, so there is no problem with the usual placement method.
If there are GND layers above and below, like in a stripline, use the one closer to the transmission line (the one with stronger electromagnetic field coupling) as the reference.
If you feel that the upper and lower GND layers are the transmission line, then there should be no problem using the GND on either side as the reference. If you are really concerned, you can connect the upper and lower GND layers using a sheet with Perfect E boundary conditions set near the sheet where you set the Lumped Port, and use that connected sheet as the reference for the Lumped Port.