Learning Forum

[nvl]

LumpedPort.docx

[Praneeth]

Kindly use "image" option to embed the screen shot into the post.
The said error may arise when one of the conductors connected to a lumped is touching/shorted with other metal.
Thus the port is only seeing one conductor instead of two conductors. This might not be your intention.
Please check for the intersection point and modify it accordingly.
This may sometimes happen if you have not explicitly added any air region which is required for your model. Please check.
All the very best Praneeth.

[nvl]

I tried to insert small copper box above the port and mark it as another conductor (reference), but now it replies
[error] Port '2': The port has no terminals defined on it. (12:44:18 PMMar 29, 2022)
[error] Simulation completed with execution error on server: Local Machine. (12:44:19 PMMar 29, 2022)
Trying to insert terminal to the port, it conflicts with existing port. Trying to insert terminal elsewhere, the terminal is not in port.
Possibly I don't have two conductors, as my circuit starts from the port and ends to copper plates that should produce RF waves.

[nvl]

Another problem, maybe linked to previous one.
I have done the simulation now, using wave port instead. Resulting current densities (used in phase determination in lines) are order of femtoamperes per square meter. There are no visible vectors anywhere. Maybe there is some problem with current transfer (should not be)?
I have tried to embed and re-embed the port, change port impedance, integration line, applied radiation etc.

[Praneeth]

Please share snapshots of your simulation model to help us serve you better as Ansys personnel cannot access the attachments in the forum.
All the very best Praneeth.

[nvl]

The geometry with wave port is shown below.
With planar lines and more simple geometry, I finally got believable current densities. I still wonder why current is so concentrated to the port?
Even with this, it is difficult to see phase shift elsewhere.

[Praneeth]

I do not see any air region defined in the model tree window. Are you using any auto open region in your model?
Please note that the default material in Ansys HFSS is PEC. It means that HFSS fills PEC automatically in the surrounding areas of your model.
You need to define air region explicitly surrounding your model.
Kindly check if this is applicable to your model.
All the very best Praneeth.

[nvl]

Now I have inserted the air. The effect was that current density still decreased.
I did same for planar one and it seems to work as I would like.

[nvl]

I finally made it as partly planar model and calculated electric field in the charged plates successfully. Now I would like to calculate z-component of the electric field. Fields calculator guide advises to use Output -> Plot, but I don't have such setting. When I try to value/evaluate field normal to xy-plane, the response is: "The stack contents are incompatible with the current operation".