The 16 element dipole antenna array with Radome.
1. An array with hemispherical radome is simulated with the following setup using HFSS software tool version 19 in HP 640 workstation with 16 core processor and 128GB RAM:
a. Frequency sweep : 4.4 to 5 GHz
b. Center frequency : 4.7 GHz
c. Frequency step: 100 MHz
d. No. of adaptive passes : 20
e. Max delta value : 0.02
Note : Radome was designed with 200 segments
2. The meshing itself has taken more time (24 hours) and simulation stopped with error “hf3d error: SOLVER_OUT_OF_MEMORY”.
3. The same array with hemispherical radome is simulated, then mesh time is around 40 minutes and simulation is completed with an error “failed to converge_frequency point 4900000Hz as 400 iterations are reached”.
Note : Radome was designed with 50 segments
Please advise us a solution to address the above issues and complete the simulation to get valid results for our requirement.
Please let us know, if we need to provide any further information to expedite the process.
Increase in no of adaptive passes, may help to meet the convergence creteria. Please do the same. And let me know if the issue persists
Alessio Mancini
Thanks for your suggestion.I am trying to use hybrid region; IE for radome and FE-BI for radiating element. But it shows the error "Hybrid assignment: IE requires an Base". So the IE can be assigned in HFSS design tool or we have to go for HFSS-IE design tool.
Neeresh Kumar These things already tried. Increasing of adaptive passes requires more than 128 GB of RAM size. Also increasing the number of adaptive passes increases the computational time, which is not accepted.
Thank you.
Hello,
These things actually have to do with convergence (or 'correctness') of the solution, which in HFSS for Driven simulations is evaluated on the basis of the scattering parameters observed at each port. HFSS uses adaptive meshing, which is to say that it sets up an initial mesh, solves the fields, and then re-meshes based on where the fields have a high concentration and/or gradient in structure. Each re-meshing step is called an "adaptive pass". Importantly, at each step, the scattering parameters are evaluated at each port, and compared to the previous step. The difference between the two is called "delta S". So, in order to make sure a simulation is correct, HFSS does adaptive passes until the delta S falls below a set threshold. HFSS also gives you a large degree of control over this process: you can set delta S to be whatever it requires, and can also tell it to do a maximum number of passes, such that the simulation will stop whether or not the scattering parameters have converged.
Link:- https://www.ansys.com/-/media/ansys/corporate/resourcelibrary/application-brief/ab-ansys-hfss-adaptive-broadband-meshing.pdf
Thanks,
Smrity Dwivedi thanks for sharing the concept. I really appreciate it.
If you have any suggestion/ solution to the raised problem that will be most helpful. addition to this, if you have any idea in hybrid region assignment please let me know.
Thank you.
Regards.
Debaprasad
9853342902
@debaprasad, Kindly use FEBI (Hybrid) analysis for Radome and FEM for Dipole. First try with PO and for more accuracy change it to IE.
Neeresh Kumar Thanks for your suggestion. Can you please share the process how to assign the Hybrid region for a radome included antenna. Considering which I can able simulate the structure successfully.
Thank you.
Kindly refer the attachment..
You may follow the link:
https://youtu.be/VD_R5ibOhhU
Neeresh Kumar Thanks for your suggestion. I found some useful resource. However, I had gone through these PDF in earlier days.
Actually, I am looking for an solution, where the radiating element is place very closed with non-radiating element. For this particular scenario the issue is coming.
If you have some more useful resource you are welcome to share.
-Regards
Debaprasad
Debaprasad Barad
You can increase the number of passes
Else
Increase the maximum Delta S to little higher value.
It may work. However, accuracy in results will change if you increase maximum Delta S.
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