A broadband dielectric spectroscopy study of the relaxation behaviour of subsoil

The complex dielectric permittivity or electrical conductivity of saturated and unsaturated soils was examined in the frequency range from 1 MHz up to 20 GHz at room temperature and under atmospheric pressure. Three soil-specific relaxation processes are assumed to act in the investigated frequency-temperature-pressure range. The dielectric relaxation behaviour is parameterised with the use of a simple fractional relaxation model as a function of moisture. The chosen approach provide an estimate of the frequency depended dielectric permittivity based on a parameterisation of each relaxation processes as a function of water content and porosity.

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