# 3D Anisotropic Medium

This option specifies an anisotropic (3D) medium represented by a simple diagonal tensor, a nine element (full) tensor, complex tensor or a Polder tensor (for ferrites)

## Diagonal tensor

Define the diagonal permittivity and permeability tensors by defining up to three
dielectrics constituting the medium properties along the UU, VV and NN axes. If no linear
dependencies exist between two axes, enter `0`. A value of
`0` indicates empty or zero. Use the text, `Free
space`, to indicate the free space medium.

## Full tensor

Define the permittivity and permeability tensors by defining up to nine dielectrics
constituting the medium properties along the UU, UV, UN, VU, VV, VN, NU, NV and NN axes. If
no linear dependencies exist between two axes, enter `0`. A value of
`0` indicates empty or zero. Use the text, `Free
space`, to indicate the free space medium.

## Complex tensor

Define the permittivity and permeability tensors by using complex values. An entry in the tensor may be a complex number, pure real number or a pure imaginary number, but not 0.

## Polder tensor (ferrites)

Define a ferromagnetic material.

- Relative permittivity
- Relative permittivity ${\epsilon}_{r}$ of the medium.
- Dielectric loss tangent
- Dielectric loss tangent $\mathrm{tan}\delta $ of the ferrite.
- Saturation magnetisation (Gauss)
- Saturation magnetisation $4\pi {\text{M}}_{s}$ of the ferrite.
- Line width (Oersted)
- Line width $\u25b3\text{H}$ of the ferrite.