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Considering the confidentiality, my model may not be able to share in the altair community. I have tried to set the region as free space, then set metallic on its surface, and finally run successfully with the MLFMM solver. Do you think this is right?
Hi @Yufeng Cai ,
In fact, this idea also came to me, but only after I wrote. I think this is the right approach. With a conductivity of 1000 S/m, the material actually has more metallic than dielectric properties. Accordingly, the currents should also be on the surface, which makes the approach plausible.
Best regards,Torben
a conductivity of 1000 S/m corresponds to very high dielectric losses, while a value of tand = 0.003 corresponds to rather low dielectric losses.
Example: If you convert conductivity to loss tangent and vice versa (can be done using an appilication macro in CADFEKO) at 1 GHz:
sigma = 1000 S/m -> tand = 4493.8tand = 0.003 -> sigma = 0.00066759
Best regards & a Happy New Year,Torben
Hi @Yufeng Cai , a conductivity of 1000 S/m corresponds to very high dielectric losses, while a value of tand = 0.003 corresponds to rather low dielectric losses. Example: If you convert conductivity to loss tangent and vice versa (can be done using an appilication macro in CADFEKO) at 1 GHz: sigma = 1000 S/m -> tand = 4493.8tand = 0.003 -> sigma = 0.00066759 Best regards & a Happy New Year,Torben
Thank you for your reply! In my simulation, the parameter of this dielectric is ε_r=4, and the conductivity is 1000 S/m. How can I define this material in FEKO and which solver should I use?
As you know, MLFMM is recommended for electrically large models (>4 lambda). Maybe you could simulate your model with standard MoM?
Hi @Yufeng Cai , As you know, MLFMM is recommended for electrically large models (>4 lambda). Maybe you could simulate your model with standard MoM? Best regards,Torben
But my model is electrically large, it's hard for me to simulate with MoM. Thanks for your replying！
I first thought of the "Dielectric surface impedance approximation", which was implemented especially for dielectrics with particularly high losses. But it seems that the conductivity of 1000 S/m is much too low even for that approach...
The only other thing you could try is MoM with higher order basis functions. This is another method besides MLFMM to reduce memory requirements for electrically large models. I'm not too optimistic, but it's worth a try.
Would it be possible to attach your model here?
Hi @Yufeng Cai , I first thought of the "Dielectric surface impedance approximation", which was implemented especially for dielectrics with particularly high losses. But it seems that the conductivity of 1000 S/m is much too low even for that approach... The only other thing you could try is MoM with higher order basis functions. This is another method besides MLFMM to reduce memory requirements for electrically large models. I'm not too optimistic, but it's worth a try. Would it be possible to attach your model here? Best regards,Torben
Hi @Yufeng Cai , In fact, this idea also came to me, but only after I wrote. I think this is the right approach. With a conductivity of 1000 S/m, the material actually has more metallic than dielectric properties. Accordingly, the currents should also be on the surface, which makes the approach plausible. Best regards,Torben
Thanks for your answer！
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