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Caltech joins the wireless energy hype
Ranayna:
--- Quote from: madires on June 07, 2023, 03:56:29 pm ---Satellite beams solar power down to Earth, in first-of-a-kind demonstration: https://www.science.org/content/article/satellite-beams-solar-power-down-earth-first-kind-demonstration
TL;DR: They transmitted 200mW of microwaves from a satellite to earth.
--- End quote ---
They did *not* transmit down 200mW down to Earth. They transmitted 200mW within the satellite, over a distance of less than half a meter. They then turned the transmitter towards earth and were able to detect it.
Sadly, there is no mention about the power of the transmitter, i infer from the article, and others i have read about this, that 200mW was the received power.
--- Quote from: helius on June 07, 2023, 06:32:16 pm ---As players of "SimCity 2000" will know, when the satellite solar collector beam wanders from its designated receiver station, lots of fires are started. We should think carefully about whether we want megawatts of microwave energy aimed at us.
--- End quote ---
Yes, that was exactly were my thought went to :D That damn microwave power station, while clean, so often burned down the area around it :D
And if this thing has an aimable beam, the potential for misuse is staggering. Literal Space Lasers....
Haenk:
Good thing is: Before investing billions and more billions, there *might* be a discussion in advance if one should just buy 100 times the generated power by installing solar panels on, say, flat ground.
Marco:
Much more money is going into PV, hydrogen and methanation ... but storage add a big cost multiplier to PV.
Is it big enough to justify satellite power beaming? Almost certainly not, but it doesn't hurt to do a little exploration of the solution space. Maybe a space gun would drastically reduce launch costs of materials? You never know.
Marco:
--- Quote from: Ranayna on June 08, 2023, 08:10:57 am ---They did *not* transmit down 200mW down to Earth. They transmitted 200mW within the satellite, over a distance of less than half a meter. They then turned the transmitter towards earth and were able to detect it.
--- End quote ---
You can't really go small for any real testing, to get sufficient beam quality you need a huge phased array ... and if the transmitter is huge, even with a good beam the receiver needs to be huge squared.
It's better to just do it all in sim, none of it is rocket science.
PS. you can do mmWave I guess to at least get 1 order of magnitude in size reduction for a scale model, but at the same time the phased array and antennas become much more complex, it's not worth it.
PPS. I wonder what's the most efficient way to build a huge phased array. Could you just have an oscillator at every patch antenna and sync it to a modulated signal from earth? No need to program anything, no need for communication across the array, array deformation is automatically corrected for?
jonpaul:
Old idea,
1960s MPSS rectenna Glasser,
https://www.osti.gov/servlets/purl/1650318
Could be used as a weapon as well
Jon
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