Re: I cant Get the Masters Degree Because of HFSS, Please He
Goher said:
Dear All,
Also, I attached a very simple cylindrical cavity that i made to check the output results from the HFSS in order to start trusting HFSS. The correct results for this cavity is calculated by the very basic microwave laws which means that they must be correct but the HFSS also gives different values which is strange!!
Hi !
I checked quickly your projects.
1. The main mistake is that you try to calculate full model despite of the natural symmetry plains. In that case the number of
mesh elements is unnecessary large and the results could be really strange because of spliting the dipole (or higher) resonances on two polarizations.
The Frequencies of these two modes may be different since the mesh produced by HFSS is nonsymmetrical.
So you need to split your model with XZ and YZ plains and define proper boundary conditions (E or H).
Moreover you may split it more once by the half length if you defined full cavity in Z direction.
2. You don't need to set PerfectE condition to outer boundary, HFSS assumes it by default
3. Don't use metal (copper) elements in your design if you can avoid it. Just subtract it from the main body and than define lossy (conductivity) boundaries.
4. You try to mesh the skinlayer which is totally useless at freq. about 10 GHz
The depth is about microns or order 10^-5 comparing to the cavity size.
5. Don't try to calculate many modes (20) at one time. It's a lot. Split your analyses on few bands and calculate it one by one with about 5 modes max at once.
6. Control the mesh of your objects ! You need to define proper Model resolution and SurfaceAproximation before you start calculation. Also it will be a good idea to
add more elements (do mesh refinement) to the critical part of your cavity
7. Don't use lower order mesh (better to add more memories
8. After the calculation check the convergence (<0.1 % is good) , EM fields in the cavity and actual mesh. The Fields should be smooth, without unphysical behavior.