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WPT overview paper ...

Apple apparently interested in exactly the type of wireless power transfer we were looking into with Duncan and Xurxo!

Charged like your electric toothbrush by lowering the receiving coils to 4cm above the ground.

nice; there are similar trials ongoing a bit all over; there is one I know of in Mannheim, where i think they have quick charging coils at each stop to reduce the battery mass they need to carry; I have seen a demonstration of this in Kyoto university about 13 years ago on a normal car - even one where they had an entire road equipped with these chargers and tested with charging as you go , charing at traffic stops, parking etc ....

wireless power transmission made useful ? this application did certainly not come to my mind when Guy Pignolet showed me 12 years ago how his handy would lid up a small diode after our first SPS meeting in Paris ...

Great idea to use either unused/wasted energy. Then again, the signal power (receiver floor) is steadily going down going from 3G to 5G, yet there might be more use of bandwidth to compensate this. It is funny though that you buy a device which could have the function build in it on the back from the start, yet you put a shell around it and then harness wireless power to give it that add-on functionality.

Recently I came across this article in a Japanese newspaper about wireless power transmission applications in the women beauty business. It's probably not as useful as an iPhone cover but apparently there is a market for such things! http://www.japantimes.co.jp/news/2014/04/18/business/led-nails-light-up-when-calling/#.U2OcWV7v2X8

interesting paper for wireless energy transmission ... Duncan have a look ...

Yeah, its nice to see some research into semiconductors which aren't silicon. This paper would be useful for us if we wanted to do a study of the efficiency of the DC to microwave conversion systems for SPS.

this is what I call wireless power transmission really applied ...!

this is amazing !

Duncan and Xurxo have a look at this - just discussed today :-)

as with my last post: how long could such distances get? ready for SPS?

how "large" could these distances be? - ready for SPS?

I don't think that the distance is the important criteria... It seems that the directivity is of the order of a laser one, so the divergence will be equivalent. Perhaps the important criteria is that the cost of these type of light sources could be cheaper...? and also perhaps what power transmission is achievable? It seems also that now that this concept could be used for to focus cheap lasers, instead of using complex optics in cd-rom players, etc... see http://news.softpedia.com/news/Highly-Directional-Semiconductor-Laser-Created-at-Harvard-90839.shtml

are these all nutheads or is there some truth in the comments to this article??

5.8 GHz wireless power transmission for mainstream gadgets ...

Proximity to the transmitter impacts power delivery as follows: 4W delivered to 4 devices simultaneously within 0-5 feet 2W delivered to 4 devices simultaneously within 5-10 feet 1W delivered to 4 devices simultaneously within 10-15 feet How to make a piecewise approximation of one inverse square law for commercial purposes

:-) - which also tells us that these are not measured values but estimations it seems to me ...