- the uniform illumination law is the best for the first criterion but the worst for the two other. - a tapered illumination law is bad for the first criterion and better for the two other. The choice can therefore only come out of a compromise. This is the Gaussian illumination law with —10 dB attenuation on the edges which was kept in the reference project. For this law (Fig. 3): - the first side lobe is at -23 dB for = 2.3 10-4 rad. - the second side lobe is at -30 dB for 02 = 3.4 10“4 rad. On Earth where the power density at the center of the rectenna is 23 mW/cm2, these levels and the angles correspond: - for the first side lobe to 0.08 mW/cm2 at pi = 8 km from the center. - for the second side lobe to 0.02 mW/cm2 at p2 = 12 km from the center. On the edges of the rectenna, at 6.5 km from the center, the power density is 0.1 mW/cm2.
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