• RECTENNA DIODES SHOULD HAVE TOLERANCE TO: • Overvoltage transients —Fast aircraft • Thermal transients —Slower objects (e g. helicopters) FIGURE 3 DIFFRACTED SIGNAL ENHANCEMENT AT THE RECTENNA CAN BE CAUSED BY AN OBJECT FLYING THROUGH THE POWER BEAM. Although existing earth-space propagation measurements to date have indicated that amplitude fluctuations would cause insignificant scattering at a Rectenna, there are two factors which impair the application of this data to a Satellite Power System (SPS). In all studies found, there is significant aperture averaging due to the large aperture receiving antennas used. This is in contrast to the very small aperture area of each "independent" receiving element in the Rectenna. The second factor is that the signals measured in those studies were wide-band. Most deep fades are frequency selective. Therefore, observed amplitude fluctuations would be expected to be less than those of the monochromatic SPS power beam. Thus, further space-earth transmissions'studies are proposed.
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