Digest Number 509 Forum: SSI-List
Thread: Digest Number 509
# 17216 byIan Woollard on Dec. 20, 2002, 11:37 a.m.
Member since 2022-08-22
>Lasers are not much use, because the rectenna would simply be PV arrays are low conversion efficiency.
>
Do you have a reference for that low conversion efficiency? The best PVs
are now at about 30% when used with sunlight, but that aside, all PVs
are very efficient at their favourite frequencies- pretty much the
frequencies corresponding to those emitted by infrared lasers. I don't
have the figures to hand, but I would not be surprised if they weren't
50-70% efficient, even the cheapest ones.
handle most of the frequencies well at all; that's why they're usually
down at 10-15% efficient.