The paper presents the study of the effect of microwave radiation on dry soil. For this, five different soil samples were collected from various geographical regions of India. The waveguide cell method was employed for the determination of the storage factor ( e′) and the loss factor ( e″) of the soils. In this paper the methodology of measurement of dielectric constant for unexposed and exposed soils to microwave radiation is given and the results obtained are discussed.
The sections in this article are ::: ::: ::: 1 ::: Radiometers ::: ::: 2 ::: Radar Scattering ::: ::: 3 ::: Radar Scatterometers ::: ::: 4 ::: Radar Altimeters ::: ::: 5 ::: Ground-Penetrating Radars ::: ::: 6 ::: Imaging Radars ::: ::: 7 ::: Real-Aperture Radars ::: ::: 8 ::: Synthetic-Aperture Radars
A new identity is derived which relates the gain and the field distribution (or confinement factor) in a dielectric waveguide with complex refractive indices. This identity is valid for any guided mode of waveguides with an arbitrary cross section. It provides a new check of the accuracy of mode solvers. Also, it can be used in a variational approach to predict the gain or loss of a guided mode based on knowledge of confinement factors. It is shown that a previous analysis that is often used, is not correct. In addition, approximate expressions for the gain in slab waveguides are presented.