G. Macelloni et al., EFFECTS OF SPATIAL INHOMOGENEITIES AND MICROWAVE EMISSION ENHANCEMENTIN RANDOM-MEDIA - AN EXPERIMENTAL-STUDY, IEEE transactions on geoscience and remote sensing, 34(5), 1996, pp. 1084-1089
The effects of spatial distribution of the scattering elements on micr
owave emission from random media have been investigated using an exper
imental model composed of long, thin vertical dielectric cylinders on
a reflecting screen, The measurements have been carried out at 10 and
37 GHz, H, V polarizations and different nadir and azimuth angles, Ran
dom ''uniform'' and ''cluster'' distributions as well as periodic ''ro
w'' configurations with different volume fractions have been studied,
When the cylinders are distributed in nearly circular clusters or in p
arallel rows significant emission enhancement with respect to uniform
distribution is detected at 10 GHz and incidence angle lower than 50 d
egrees, whereas, at 37 GHz the emission is lower for clusters and stro
ngly dependent on azimuth angle for the ''row'' configuration.