Point like sources can be pointed. That's the whole point. ;) They can be made to not reach eyes, or other places which are not their destination. This is probably very hard to do well, I think there is only one or two…
Reflection is not so scary once you have a wave that doesn't go everywhere but really approximates a point source. And if you go high enough with RF frequencies, you'll get significant attenuation when passing through…
Take a look at the diffraction formula and plug in realistic radio frequencies. Even tens of GHz get all over the place very quickly, not to mention the more common place single digit GHz frequencies.
Wireless power over radio waves is a dead end. Radio waves go everywhere, great for your cellphone. But completely useless for power beaming. Most of that lost energy doesn't go into heat, but into your body. Lasers are…
Point like sources can be pointed. That's the whole point. ;) They can be made to not reach eyes, or other places which are not their destination. This is probably very hard to do well, I think there is only one or two…
Reflection is not so scary once you have a wave that doesn't go everywhere but really approximates a point source. And if you go high enough with RF frequencies, you'll get significant attenuation when passing through…
Take a look at the diffraction formula and plug in realistic radio frequencies. Even tens of GHz get all over the place very quickly, not to mention the more common place single digit GHz frequencies.
Wireless power over radio waves is a dead end. Radio waves go everywhere, great for your cellphone. But completely useless for power beaming. Most of that lost energy doesn't go into heat, but into your body. Lasers are…