Anisotropic Relative Permittivity Tensors

The relative permittivity tensor for an anisotropic material is described by

where

• e₁ is the relative permittivity of the material along one tensor axis.
• e₂ is the relative permittivity along the second axis.
• e₃ is the relative permittivity along the third axis.
• e₀ is the permittivity of free space.

The relationship between E and D is then

To specify the relative permittivity for an anisotropic material, enter the e₁, e₂, and e₃ values in the Value boxes of the T(1,1), T(2,2), and T(3,3) rows, respectively. These values can also be entered as variables.