cloud base. Beam nadir angle is 0°, cloud width is 24 km, and the Rain M drop size distribution is assumed. Decreasing rain cloud thickness from 7 km to 5 km at a beam frequency of 5 GHz leads to decreased surface power density levels, as well as decreased absorption of the beam within the cloud. Total surface scattered power is decreased in this case from 57.5 to 40.7 MW, while rain absorption within the cloud decreases from 907 to 658 MW. A further decrease in rain cloud thickness to 3 km decreases total surface scattered power to 22 MW and rain absorption to 403 MW. Decreasing rain cloud thickness, while keeping cloud base height fixed at the surface, decreases the surface power density levels at all surface position. At the edge of the rectenna (r = 5 km), maximum surface power densities are 10.4, 6.6, and 4.4 /zW/cm2 for cloud thicknesses of 7, 5, and 3 km, respectively. At r = 10 km (5 km from the edge of the rectenna), corresponding power densities are 1.3, 0.6, and 0.25 /xW/cm2, respectively, while at r = 20 km corresponding values drop to 0.16, 0.07, and 0.03 /zW/cm2.
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