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I am trying to export cadence layout to GDSII files and then import it to HFSS. When I import the files to HFSS, I get a flat sheets. It seems that I have to generate (or export) some sort of Tech file from Cadence. Can someone instruct me to how this should be done or point me to the correct documentation that I should be reading to accomplish this ?
There's no such tool as "Cadence" (it's a company name), so which tool are you drawing a layout in?
The GDSII (Stream) file will just have shapes on various layer numbers. Almost certainly you would need to describe information about the layer stack (layer thicknesses, conductivity, dielectric thicknesses etc) for HFSS, but that's an HFSS setup issue. You coul read the HFSS documentation or ask in an Ansys forum (assuming they have such things).
In reply to Andrew Beckett:
In reply to Bahaa:
Thanks. I asked because it might have been a board layout, and you might have been using Allegro or Orcad Layout.
In Virtuoso's case, you might have some of the process stack information in an ICT file or a QRC technology file, but I'm not sure that's going to help you with setup for the layer stack for HFSS (I only have a passing acquantance with HFSS). It may contain some similar information, but the format will be different.