when i import my design from HFSS to CST i obtained a big difference in results between them, i will be very thankfull for any help
Dear Mohamed el Hammoumi . Varying results between CST and HFSS are normal. I had different results for the same antenna design in HFSS depending on AMD or Intel processor. AS 1s step you need to check that you used in HFSS and CST the same solver type and similar meshing.
@Mohamed el Hammoumi
Pls share your hfss file with confidance and belive. I will check and tell you the actual problem.
In addition to the answer given by @Vadym Slyusar, the mostly used boundary conditions in CST are either Open or PML. Try to use PML from both HFSS and CST or Open in CST and Auto Radiation in HFSS.
Also, you can share the results' mismatch for a better guidance/help
Dear Mohamed el Hammoumi
I suggest you to export your file using .sat format. Also, check the air box dimensions in HFSS.
thank you so much for all of you , i will export my file using .sat as format just to see if i can improve the results . but, from another hand i want share with you the steps used to achieve roughly the same response but with shifting in frequency:
- i imported all the design in CST ;
- i deleted the radiation box
- but i let the rectangular port selected and i double clicked on waveguid port and then just i checked the negative square +Ok
- finally i tried to make some change in the boundary box(the volume) until founding the good results
before comparing the results between HFSS and CST please verify that you set the radiation box dimensions at a distance of lambda/4 from every side of the antenna on HFSS.
For the frequency shift, check the permittivity of the materials because some materials do not have the same permittivity in CST and HFSS even though they have the same name. Also, check the meshing and delta s convergence.
thank you so much Abdebasser lamkaddem , about the substrate material i used FR4 and i new that the value that's which exist in CST is 4.3 and in HFSS is 4.4 but when i import the design i observe that this value dosn't change stil the same 4.4 in the both softwares. about the mesh when i tried to change the values i loos the same performance founding in HFSS .
Dear Mohamed el Hammoumi
In HFSS, for S11 please use interpolating as sweep type and increase the delta s accuracy and make sure that it converges by increasing the maximum number of passes. If it is possible share the setup that you are using in HFSS simulations (sweep type, delta s convergence)...
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