The optimum efficiency of the rectifying elements is attainable at specific RF density levels and at specific DC load levels. The matching DC load increases for low RF density levels, which makes it needful to use different elements at different locations of the rectenna. Higher impedance elements are needed at the rectenna edge locations which is concomitant with the need to array more parallel elements to reach specific power levels. The receiving aperture cross-section area of such an element is approximately 50 cm^2 . The conversion efficiency of the element is averaged to be 89%, with 86% efficiency at the periphery of the rectenna at power levels of approximately 2 1 mw/cm , and 94% at the center of the rectenna at power levels of 21 mw/cm^2 . The RF/DC converters are arrayed in units of 1 MW at a DC voltage at +2 kV. These again are arrayed to form 2x20 MW primary units at the same DC voltage. The DC efficiency of arraying to the level of 40 MW units at +/-2 kV is evaluated to be 97%, which leads to total RF/DC efficiency of approximately 85%. A 5000 MW rectenna contains 10.96 billion RF assemblies. All the primary units of 40 MW along a radial line of the rectenna are locally converted to utility power levels and the power flow is directed radially to or out of the center of the rectenna. Conversion to AC is performed in a total of 125 50 MW converter station/5 GW rectenna. A moving factory concept would be utilized for rectenna construction. Materials brought in at one end of the factory are basic ingredients to high speed automated manufacture and assembly of rectenna panels which flow continuously through the factory. Detailed features of this concept have not yet been developed.
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