Study of emissivity of dry and wet loamy sand soil at microwave frequencies

摘要

Results of estimation of emissivity from dielectric constant of dry and wet soil using emissivity model for microwave frequencies ranging from 2 GHz to 20 GHz are presented. The measurements of the dielectric constant of dry and wet soil had been carried out using HP network analyzer and HP dielectric probe employing co-axial probe method. The estimations are made with incidence angles o°, 30°, 45° and 60° for both horizontal and vertical polarization. The emissivity, which is less than one, increases with frequency and decreases with moisture content. In both the cases emissivity for vertical polarization is higher than that for horizontal polarization.