Dielectric Modelling

Frequency independent

The properties of the dielectric medium are specified as frequency independent.

Relative permittivity: Relative permittivity $ε_{r}$ of the medium.
Dielectric loss tangent: Dielectric loss tangent $\tan δ$ of the medium (this is an alternative way to specify the conductivity $σ$ — the two loss terms are related by $\tan δ = \frac{σ}{ω ε_{r} ε_{0}}$ and have different frequency behaviour).
Conductivity: Conductivity $σ$ in $\frac{1}{Ω m}$ of the medium.

Debye Relaxation

The relaxation characteristics of gasses and fluids at microwave frequencies are described by the Debye model. It has been derived for freely rotating spherical polar molecules in a predominantly non-polar background.

Relative static permittivity: Relative permittivity $ε_{s}$ of the medium.
High frequency dielectric constant: High frequency dielectric constant $ε_{\infty}$ of the medium.
Relaxation frequency: The relaxation frequency $f_{r}$ of the medium.

Cole-Cole

The model is similar to the Debye model, but uses one additional parameter to describe the material.

Relative static permittivity: Relative static permittivity $ε_{s}$ of the medium.
High frequency dielectric constant: High frequency dielectric constant $ε_{\infty}$ of the medium.
Relaxation frequency: The relaxation frequency $f_{r}$ of the medium
Attenuation factor: Attenuation factor $α$ of the medium.

Havriliak-Negami

This is a more general model and should be able to successfully model liquids, solids and semi-solids.

Relative static permittivity: Relative static permittivity $ε_{s}$ of the medium.
High frequency dielectric constant: High frequency dielectric constant $ε_{\infty}$ of the medium.
Relaxation frequency: The relaxation frequency $f_{r}$ of the medium
Attenuation factor: Attenuation factor $α$ of the medium.
Phase factor: Phase factor $β$ of the medium.

Djordjevic-Sarkar

This is a particularly well suited broadband model for composite dielectrics.

Variation of relative permittivity: Variation of the relative permittivity $△ ε$ of the medium.
Relative high frequency permittivity: Relative high frequency permittivity $ε_{\infty}$ of the medium.
Conductivity: Conductivity $σ$ in $\frac{1}{Ω m}$ of the medium.
Lower limit of angular frequency: The lower limit of the angular frequency for the medium, $ω_{1}$ of the medium.
Upper limit of angular frequency: The upper limit of the angular frequency for the medium, $ω_{2}$ of the medium.

Specify points in the *.pre file (linear interpolation)

This is a particularly well suited broadband model for composite dielectrics.

Frequency: The frequency for the specific data point.
Relative permittivity: Relative permittivity $ε_{r}$ of the medium at a specific frequency.
Dielectric loss tangent: Dielectric loss tangent $\tan δ$ of the medium (this is alternative way to specify the conductivity $σ$ — the two loss terms are related by $\tan δ = \frac{σ}{ω ε_{r} ε_{0}}$ and have different frequency behaviour).
Conductivity: Conductivity $σ$ in $\frac{1}{Ω m}$ of the medium.