Learning Forum

[bendham.watt]

Hi There,

I would like to simulate an RF Coil loop in HFSS. I am undergoing this endevour to extract S-parameters and see the fields generated on some more exoctic shapes that I am making. However, I just can't seem to wrap my head around how to do this. My HFSS is setup as:

The set-up I have can be distilled down into this incredibly simple case: one loop of copper wire (see pictured below).

I realize that a terminal lumped port may be best suited for this to drive the wire. So, I have tried making a break in the wire, a space for the port, so that the wire can be driven by some input (see below picture). The terminals are on the same plane. Note on creation there is only one conducting body (the wire). On creation it makes two terminal edges. 

                 

Now, when trying to run the similation it says we should remove one of the terminal edges. So I do.

Now my excitation is only on one edge of the sheet:

Now the simulation runs. But this just feels wrong? What is the lumped port doing if it only has one terminal? Why did I have to delete one of the terminals?

Could you please confirm that this is the correct methodology I have here, and confrim that the deletion is required to get this to work? I would like to be confident that I am using the software correctly.

Thank you for any thoughts and help :).

Best,
Matthew

[Takeshi Itadani]

Your settings are correct. When you select Terminal in the Options of Solution Types, you need to set one of the contacting conductors as Terminal and the other conductor as Reference. In the last image, Terminal is set on one edge of the loop, which means that the other side of the Lumped Port is set as Reference, so analysis is possible with this port setting.

[bendham.watt]

Got it, thank you Takeshi for confirming. So, the other side of the Lumped Port is the reference.

The analysis I want to perfom makes sense.