Application of strong fluctuation random medium theory to scattering of electromagnetic waves from a halfspace of dielectric mixture
Abstract
The strong fluctuation random medium theory is applied to calculate scattering from a halfspace of dielectric mixture. The first and second moments of the fields are calculated, respectively, by using the bilocal and the distorted Born approximations, and the low frequency limit is taken. The singularity of the dyadic Green's function is taken into account. Expressions for the effective permittivity for the full space case are derived. It is shown that the derived result of the effect permittivity is identical to that of the Polder and van Santern mixing formula. The correlation function of the random medium is obtained by using simple physical arguments and is expressed in terms of the fractional volumes and particle sizes of the constituents of the mixture. Backscattering coefficients of a halfspace dielectric mixture are also calculated. Numerical results of the effective permittivity and backscattering coefficients are illustrated using typical parameters encountered in microwave remote sensing of dry and wet snow. It is also shown that experimental data can be matched with the theory by using physical parameters of the medium as obtained from ground truth measurements.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 March 1982
 DOI:
 10.1109/TAP.1982.1142774
 Bibcode:
 1982ITAP...30..292T
 Keywords:

 Dielectrics;
 Electromagnetic Scattering;
 Fluctuation Theory;
 Half Spaces;
 Microwave Sensors;
 Remote Sensing;
 Backscattering;
 Born Approximation;
 Electromagnetic Fields;
 Random Processes;
 Scattering Coefficients;
 Statistical Correlation;
 Communications and Radar