problem of SPS and perhaps a veritable Pandora's box. As depicted in Fig. 1, the SPS is visible by line of sight from much of the earth and many other satellites in space. Therefore, the possibility of interference by out of band (i.e., outside of 2.4-2.5 GHz) energy emitted by the SPS is a serious problem. Efficient microwave generators such as would be used in the SPS generally exhibit high harmonic content and often high noise and spurious signals. In principle, the cost of suppression and filtering could pose a serious SPS problem. In addition to this, there is the potential problem of harmonic generation at the rectenna and reradiation of such harmonic energy. Lastly, even though environmental microwave levels on the ground are believed to be safe for human exposure, they would be uncommonly high compared to today’s levels and possibly produce “high-power” effects (7) in consumer (or other unshielded) electronics or what sometimes is called incidental interference. The chance of this might be increased by an airplane straying into the area near the rectenna or by scattering by such airplanes.
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