Hi Ally,
It is not possible to combine two materials in Ansys HFSS. However, if you have some measured data for the final material after mixing, then you can assign those properties to a custom material inside Ansys HFSS which you can use for the simulation. Also, you can assign project variables to the material properties in Ansys HFSS which you can parameterize to get the desired response.
All the very best.
Praneeth.
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