Evaluation of relative permittivity and conductivity of forest slab from experimentally measured data on lateral wave attenuation constant†

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Abstract
Many experiments have been carried out to study the absorption and scattering properties of forest vegetation on radiowaves but very little has been reported on the measurements of relative permittivity (∊r) and conductivity (σ) of forest slab. Due to various constraints, the in-situ measurements of ∊, and σ were limited to 75 MHz. Inverse methods have reportedly been employed to evaluate ∊ r and σ for forest slab from the experimental data on the measurements of antenna pattern, reflection coefficient, wave impedance, and path loss, etc. These studies were restricted to 400 MHz. In this paper the values of ∊ r and σ for the forest slab have been estimated by fitting the theoretical model to the measured data on lateral wave attenuation constant derived from the height-gain measurements conducted in forest, in the frequency range of 50–800 MHz.

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