Hi Vu Vuong,
I am not sure where your graphs are derived from but in general the permittivity of dielectrics is given by the equation,ε = ε' - jε''The relative permittivity is defined from the real portion of ε from the equation,ε'=εr * ε0
You can find more information on relative permittivity under the HFSS Help, in the following link:Ansys HFSS - Relative PermittivityI hope that helps.
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