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I just deleted a reply because I misread your boundary conditions. Have you tried to cap the ends of the coax with a PEC cylinder? Im taking a look at your model and if I can figure out the problem I'll post later.

Yes, with an infinite ground plane the monopole looks like a dipole, but would yield a farfield that looks like the top half of a dipole's farfield pattern. I made some changes to the CalcNF2FF arguments and the theta range but running into problems. I get the error: data mismatch between read and r...

That sounds exactly like what's happening. Thank you, I'll look into the usage to see how its done. I'll post it as a tutorial once I get it to work. Thanks, Thorsten.

Paul

I am trying to simulate a simple monopole antenna on an infinite ground-plane. The negative z boundary is set to PEC with all other boundaries set to PML_8. A lumped port is put between the z=0 plane (plane of the PEC ground plane) and the bottom of the monopole. The S-parameters look fine and compa...

I've not come across this yet but could it be something to do with the model and translation units?

As I understand it, ports need to be defined as inline with the coordinate system/mesh. So there needs to be a parallel section of transmission line or waveguide between the port's start and stop coordinates. Hope that helps.

Thanks Thorsten, Yes that makes sense. I'm working towards some coupled line couplers. The two varieties im considering are stepped line and the other is a continuously tapering line. So based on your explaination I would use the thirds rule for the stepped line coupler, where the lines are rectangu...

Does anyone know if there is a disadvantage to use the thirds rule in addition to the mesh lines lying on the edges? Is the accuracy degraded if this is done?

Did you manage to get it to work properly? I've not had any luck yet despite checking the port and priorities of the physical elements.

I have updated the files in the zipped folder, the far field files are more manageable. I used the 'OptResolution' option to achieve this using "max_res*2". The total size of 'tmp' is now 2.75 Gb.

By using "max_res*4", the 'tmp' folder will be around 815 Mb.