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HFSS and Planar EM Simulators > Relative PermittivityThe relative permittivity of all dielectrics is assumed to be complex,
which can also be expressed as
where e¢ is the real portion of e and e¢¢/e¢ is the dielectric loss tangent. If a material’s losses due to bulk conductivity will be significant, such as in semiconductor dielectric materials, an additional bulk conductivity value, s, must be added. From the time harmonic form of Maxwell’s equations, the complex permittivity, ec is defined as
where
When entering the relative permittivity in the Relative Permittivity Value text box, use the object’s real component, e¢. The real portion of the relative permittivity is a dimensionless quantity and is identical to the material’s relative dielectric constant, er.
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