"Wireless electricity for the masses"

[sleemanj]

https://www.stuff.co.nz/business/128771848/wireless-electricity-for-the-masses-could-become-a-reality-thanks-to-kiwi-startup

Transmission through air is more efficient than wires, Kushnir said.

Emrod is currently achieving 95% efficiency through air, he said, and knew how to get above 99% efficiency regardless of the distance.

Hmm, I appear to be sensing a rather rural bovine aroma.

[Haenk]

Oddly, Dr Ray Simpkin does seem to have knowledge in this area.

So I can only conclude: Yet another scam to grab funding/government money.

[Marco]

If you could make a near perfect diffraction limited RF beam with a near 100% efficiency rectenna receiver I don't see why it couldn't work

The defence industry would be very interested in diffraction limited RF transmitters by the way ... screw lasers, bring on the microwave death beams.

[TimFox]

If you could make a near perfect diffraction limited RF beam with a near 100% efficiency rectenna receiver I don't see why it couldn't work

The defence industry would be very interested in diffraction limited RF transmitters by the way ... screw lasers, bring on the microwave death beams.

See  https://en.wikipedia.org/wiki/Directed-energy_weapon

[SiliconWizard]

AHAHAHAHA!

[AndyBeez]

Electricity will be converted into an electromagnetic beam between two antennas a few hundred metres apart, at the site which is expected to be running by the end of June.

And chickens will run across the beam and roast themselves.

[SiliconWizard]

That said... we should invite some people from the "truth about electricity" threads in here.

[Marco]

And chickens will run across the beam and roast themselves.

They want to use around 1 kW/m2. Still more than enough that the tiniest little sidelobe will blow through ICNIRP limits near the beam, but it would just feel warm to actually be in the beam.

[madires]

2.4 GHz ISM band for wireless energy experts (or should I write dummies?): this band is limited to 100 mW EIRP in the EU

[AndyBeez]

They want to use around 1 kW/m2. Still more than enough that the tiniest little sidelobe will blow through ICNIRP limits near the beam, but it would just feel warm to actually be in the beam.

I thought they were delivering genuine RF power in the megawatt PEP range. How many beams will I need to run my washing machine? Interesting thought about the side lobes. What they need is some kind of conduit down which the RF can travel without escaping. Let's call it a waveguide? This will prevent the electromagnetic beam from going out of bounds due to sunspots or angry chickens.

[TimFox]

They want to use around 1 kW/m2. Still more than enough that the tiniest little sidelobe will blow through ICNIRP limits near the beam, but it would just feel warm to actually be in the beam.

I thought they were delivering genuine RF power in the megawatt PEP range. How many beams will I need to run my washing machine? Interesting thought about the side lobes. What they need is some kind of conduit down which the RF can travel without escaping. Let's call it a waveguide? This will prevent the electromagnetic beam from going out of bounds due to sunspots or angry chickens.

The east and west walls of my modest house  are each roughly 100 m² in area.  100 kW would be plenty for me (100 A service at 240 V from my utility now), but the next house to the west is the same size and only about 5 m distant, so the shadow would kill this.  Erecting such an antenna atop the house might be a problem with local winds.

[AndyBeez]

The east and west walls of my modest house  are each roughly 100 m² in area.  100 kW would be plenty for me (100 A service at 240 V from my utility now), but the next house to the west is the same size and only about 5 m distant, so the shadow would kill this.  Erecting such an antenna atop the house might be a problem with local winds.

I assume these guys have defeated the inverse square law by creating a beam so tight, it's like a laser inside an optic fiber?

At least I'll be able to charge the Tesla whilst driving at night, when the solar roadway has turned off.

[Marco]

I assume these guys have defeated the inverse square law by creating a beam so tight, it's like a laser inside an optic fiber?

Lasers don't obey inverse square law even outside an optical fibre, collimated beams have diffraction limited divergence as the fundamental limit on spread.

[JohnG]

And chickens will run across the beam and roast themselves.

Let's hope they are crossing the road at the same time 

John

[boB]

I am already using free wireless transmitted fusion energy.  (WTF)

Higher technology even yet than a directed beam !

~1kW/m^2

  Unfortunately, it only works during the daytime.

boB

[fourfathom]

Lasers don't obey inverse square law even outside an optical fibre, collimated beams have diffraction limited divergence as the fundamental limit on spread.

Ah, but free-space lasers do obey inverse square law once you are beyond the near-field (Rayleigh range ?)

[AlbertL]

Blockchain will solve all those problems!  Not sure how, but I know it will!  Or maybe they just need carbon nanotubes, or graphene, or machine learning.

[AlbertL]

I am already using free wireless transmitted fusion energy.  (WTF)

Higher technology even yet than a directed beam !

~1kW/m^2

  Unfortunately, it only works during the daytime.

boB

A few spaceships with mirrors could solve that problem!

[SiliconWizard]

Blockchain will solve all those problems!  Not sure how, but I know it will!  Or maybe they just need carbon nanotubes, or graphene, or machine learning.

Oh yeah. "AI" will solve all problems.
And the key to wireless electricity for the masses may very well be 42.

[TimFox]

I am already using free wireless transmitted fusion energy.  (WTF)

Higher technology even yet than a directed beam !

~1kW/m^2

  Unfortunately, it only works during the daytime.

boB

A few spaceships with mirrors could solve that problem!

In the "Pinky and the Brain" cartoons, the Brain conspired to purchase all real estate above the 24th floor, infiltrate a NASA space shuttle mission, and melt the polar ice caps with the Hubble telescope.
Some Nazi rocket scientists, led by Hermann Oberth, were working on the design of a large space station ("Raumstation") that would orbit at roughly 1000 km altitude, with a 100 m diameter mirror for focusing solar light to limited spots on Earth.  (see V Houghton, "Nuking the Moon", Penguin 2019, pp 206-216.)

[JohnG]

I don't know what the big deal is. I can go buy some wireless electricity at the local store, and I'm pretty sure the masses can as well...

Thanks for the pic, Wikipedia!

John

[Haenk]

Lasers don't obey inverse square law even outside an optical fibre, collimated beams have diffraction limited divergence as the fundamental limit on spread.

A laser fibre comes pretty close to a cable, IMHO - so not exactly "wireless".