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air or vacuum for box in HFSS

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Lathas

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Should the airbox material in HFSS be chosen as air or vacuum, which one will give the most accurate result compared to the actual(measured) response?
 

You can either:
- model the medium present in your real hardware
- realize that the difference is most likely meaningless
 

Medium would be open air...S21/S11 values changed while using air and vacuum during simulation, hence the question!
 

But air Er is only larger by 0.5e-3 than vacuum. If correctly modelled, it shouldn't make no significant difference.
 

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