cicocicobum
Newbie level 4
floquet port hfss
Hi everybody,
I'm trying to analyze an anular ring patch on ground plane that will be used as a reflectarray element with HFSS ver.11. In order to define the ring size I need to know the reflection coefficient phase curves toward frequency, ring size and field incident angle variation.
The first attempt is analyze it as a frequency selective surface so I set an incident wave, master and slave boundary, PML or radiation boundary and I find the first problem:
- if I put the second radiating/PML surface far (quarter wavelenght) from the ground plane HFSS gives a warning:
The background does not fully touch the following boundaries: 'PerfE1_ground_plane'. This may produce an incorrect result.
- If I put it adjacent to the ground plane it gives me the obvious warning:
Warning - Boundary 'PerfE1_ground_plane' and Boundary 'Rad2' overlap.
Neglecting the warnings I analyze the structure and plot S parameters table finding the real problem:
the table contains "Nan" values so it seems that HFSS couldn't get the correct solutions. The strange thing is that in the solution data (Results->Solution data-> Matrix Data) I find the S11 value while the others S parameters are all zeros.
I can't undestand if the problem comes from PML settings or convergence, or something else. I also thought of plotting field data and getting reflection coefficient dividing manually reflected field by incident field but I can't plot any kind of data relative to fields because I can't set any geometry in the field plot menu (and sometimes reflected field strenght is two or tree times greater than incident field, this is quite strange...)
I also tryed to use the floquet's port but this excitation is listed but not settable in the Excitation-> Assign menù.
Can anybody help me please?
Thank you
Alessandro
Hi everybody,
I'm trying to analyze an anular ring patch on ground plane that will be used as a reflectarray element with HFSS ver.11. In order to define the ring size I need to know the reflection coefficient phase curves toward frequency, ring size and field incident angle variation.
The first attempt is analyze it as a frequency selective surface so I set an incident wave, master and slave boundary, PML or radiation boundary and I find the first problem:
- if I put the second radiating/PML surface far (quarter wavelenght) from the ground plane HFSS gives a warning:
The background does not fully touch the following boundaries: 'PerfE1_ground_plane'. This may produce an incorrect result.
- If I put it adjacent to the ground plane it gives me the obvious warning:
Warning - Boundary 'PerfE1_ground_plane' and Boundary 'Rad2' overlap.
Neglecting the warnings I analyze the structure and plot S parameters table finding the real problem:
the table contains "Nan" values so it seems that HFSS couldn't get the correct solutions. The strange thing is that in the solution data (Results->Solution data-> Matrix Data) I find the S11 value while the others S parameters are all zeros.
I can't undestand if the problem comes from PML settings or convergence, or something else. I also thought of plotting field data and getting reflection coefficient dividing manually reflected field by incident field but I can't plot any kind of data relative to fields because I can't set any geometry in the field plot menu (and sometimes reflected field strenght is two or tree times greater than incident field, this is quite strange...)
I also tryed to use the floquet's port but this excitation is listed but not settable in the Excitation-> Assign menù.
Can anybody help me please?
Thank you
Alessandro