Materials in Analyst are defined in terms of the following four quantities:
relative permittivity, ε_{r},
relative permeability, μ_{r},
either the electric conductivity, σ, or the electric loss tangent, tan(δ),
either the magnetic conductivity, σ*, or the magnetic loss tangent, tan(δ*).
Any of these parameters may be isotropic or symmetric tensor materials. By specifying these parameters, you define the material properties in the Maxwell equations according to:
Here, ε_{0} = 8.854 x 10^{-12} F/m is the free space permittivity and μ_{0} = 4π x 10^{-7} H/m is the free space permeability. ρ is the electric charge density determined from the source conditions in your simulation.
When you create a new material or modify the properties of an existing material, you can specify either σ or tan(δ), but not both; this is also true for σ* and tan(δ*). Written in terms of loss tangents, the two curl equations become:
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