Convert Between Loss Tangent and Conductivity
It is possible to convert between the loss tangent and conductivity description of the material losses at a single frequency. This application macro performs the calculation and can be used in CADFEKO and POSTFEKO.
Given the frequency, relative permittivity and either the loss tangent or the conductivity of a material, the remaining parameter can be calculated through the relationship
where is the loss tangent, is the conductivity, is the angular frequency, is the free space permittivity and, is the real part of the relative complex permittivity of the medium.
It is often required to convert between these parameters when using the FDTD solver, since frequency-dependent materials are not supported for FDTD.