Measurement of Soil Dielectric Permittivity Spectra at Various Temperatures

Abstract

Dielectric sensors are a popular choice for soil moisture measurement. However, soil dielectric permittivity depends not only on moisture content but also on several other properties, including temperature. The aim of this research is to examine the impact of temperature on soil complex dielectric permittivity spectra in the 0.02-3 GHz frequency range. Soil samples were measured in coaxial cells connected to a vector-network-analyzer. The results indicated that the influence of temperature on dielectric permittivity depended on frequency and moisture content.