local port in EM circuit simulations
Right now, my circuit structure has a copper trace on one layer, and the finite ground plane on the other layer. I want to mount some active component such as diode, capacitor and inductor on the copper trace layer.
So I think I should define a couple of local port (in IE3D) or lump port (in HFSS) on the copper trace layer gap in the EM simulator, and after the simulation, I can cascade the SNP data together with the S-parameter file of the active device in order to get the whole circuit performance.
My Problem is if the copper trace is not overlapping with the finite ground plane, how can I define the local port/lump port? It seems that both IE3D and HFSS require the local port be defined with two vertical overlap conductor layers.
This is my structure geometry
-------------xxx--------------------<-(copper trace)
xxxxx------------------------------<-(RF GND)
can not define local port with no overlap
Hi, Wingji:
On IE3D, as long as your + and - terminals are close to each other, it may not need overlapping. The requirement of close + and - terminals must be met. Otherwise, the s-parameters will not be accurate. Regards.
Hi, jian. I remember in IE3D you need to sepecify a verticle or horizontal rectangular patch as the localized port. So what type of ports did you mentioned in the non-aligned "+""-" terminals scheme?
Thanks
Hi, winglj:
You can use either v-localized or h-localized port. You can also use two extension ports (+, -). In case your 2 terminals are not aligned, not on the same layers and not suitable for extension ports, you can add some small extra polygons to make them suitable for v-localized or h-localized port. The small effect created by the small addition is in the same order as the other effects caused by your irregular port configuaration anyway. In reality, you will need to connect some lumped element at the port, the small detail in the connection will cause some difference in your final result. You can't consider this small effects too.
Best regards,