Ah, infatti ecco qua:
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[...]very high conversion efficiencies - over 90% in optimal circumstances
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Quindi, basta trasmettere "poca" potenza, tanto se ne perde pochissima. QUANTO poca... beh... boh?
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[...]While high power microwaves can be painful and dangerous as in the United States Military's Active Denial System, MPT systems are generally proposed to have only low intensity at the rectenna.
[...]
this would be extremely safe as the power levels would be about equal to the leakage from a microwave oven, and only slightly more than a cell phone, the relatively diffuse microwave beam necessitates a large rectenna area for a significant amount of energy to be transmitted.
[...]
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Cioe', si potrebbero usare potenze bassissime, a patto di usare antenne grandissime.