"Wireless electricity for the masses" - Page 1
Forum section: electronics / general

author: sleemanj
author_rank: Super Contributor
timestamp: May 28, 2022, 03:51:57 am
content: https://www.stuff.co.nz/business/128771848/wireless-electricity-for-the-masses-could-become-a-reality-thanks-to-kiwi-startupQuoteHmm, I appear to be sensing a rather rural bovine aroma.

author: Haenk
author_rank: Super Contributor
timestamp: May 28, 2022, 12:24:53 pm
content: 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.

author: Marco
author_rank: Super Contributor
timestamp: May 28, 2022, 04:53:00 pm
content: 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 workThe defence industry would be very interested in diffraction limited RF transmitters by the way ... screw lasers, bring on the microwave death beams.

author: TimFox
author_rank: Super Contributor
timestamp: May 28, 2022, 05:19:02 pm
content: Quote from: Marco on May 28, 2022, 04:53:00 pmSeehttps://en.wikipedia.org/wiki/Directed-energy_weapon

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 28, 2022, 05:25:28 pm
content: AHAHAHAHA!

author: AndyBeez
author_rank: Frequent Contributor
timestamp: May 28, 2022, 05:59:26 pm
content: QuoteAnd chickens will run across the beam and roast themselves.

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 28, 2022, 07:46:49 pm
content: That said... we should invite some people from the "truth about electricity" threads in here.

author: Marco
author_rank: Super Contributor
timestamp: May 28, 2022, 07:57:04 pm
content: Quote from: AndyBeez on May 28, 2022, 05:59:26 pmThey 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.

author: madires
author_rank: Super Contributor
timestamp: May 28, 2022, 08:30:52 pm
content: 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

author: AndyBeez
author_rank: Frequent Contributor
timestamp: May 28, 2022, 08:46:45 pm
content: Quote from: Marco on May 28, 2022, 07:57:04 pmI 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 awaveguide? This will prevent the electromagnetic beam from going out of bounds due to sunspots or angry chickens.

author: TimFox
author_rank: Super Contributor
timestamp: May 28, 2022, 08:52:54 pm
content: Quote from: AndyBeez on May 28, 2022, 08:46:45 pmThe east and west walls of my modest house are each roughly 100 m2in 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.

author: AndyBeez
author_rank: Frequent Contributor
timestamp: May 28, 2022, 09:23:37 pm
content: Quote from: TimFox on May 28, 2022, 08:52:54 pmI 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.

author: Marco
author_rank: Super Contributor
timestamp: May 29, 2022, 12:25:08 am
content: Quote from: AndyBeez on May 28, 2022, 09:23:37 pmLasers don't obey inverse square law even outside an optical fibre, collimated beams have diffraction limited divergence as the fundamental limit on spread.

author: JohnG
author_rank: Frequent Contributor
timestamp: June 07, 2022, 03:06:28 am
content: Quote from: AndyBeez on May 28, 2022, 05:59:26 pmLet's hope they are crossing the road at the same timeJohn

author: boB
author_rank: Frequent Contributor
timestamp: June 07, 2022, 03:29:10 am
content: I am already using free wireless transmitted fusion energy. (WTF)Higher technology even yet than a directed beam !~1kW/m^2Unfortunately, it only works during the daytime.boB

author: fourfathom
author_rank: Super Contributor
timestamp: June 07, 2022, 05:49:04 am
content: Quote from: Marco on May 29, 2022, 12:25:08 amAh, but free-space lasers do obey inverse square law once you are beyond the near-field (Rayleigh range ?)

author: AlbertL
author_rank: Regular Contributor
timestamp: June 15, 2022, 05:14:36 pm
content: 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.

author: AlbertL
author_rank: Regular Contributor
timestamp: June 15, 2022, 05:48:28 pm
content: Quote from: boB on June 07, 2022, 03:29:10 amA few spaceships with mirrors could solve that problem!

author: SiliconWizard
author_rank: Super Contributor
timestamp: June 15, 2022, 07:44:44 pm
content: Quote from: AlbertL on June 15, 2022, 05:14:36 pmOh yeah. "AI" will solve all problems.And the key to wireless electricity for the masses may very well be 42.

author: TimFox
author_rank: Super Contributor
timestamp: June 15, 2022, 09:35:04 pm
content: Quote from: AlbertL on June 15, 2022, 05:48:28 pmIn 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.)

author: JohnG
author_rank: Frequent Contributor
timestamp: June 16, 2022, 01:00:08 am
content: 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

author: Haenk
author_rank: Super Contributor
timestamp: June 16, 2022, 09:51:26 am
content: Quote from: Marco on May 29, 2022, 12:25:08 amA laser fibre comes pretty close to a cable, IMHO - so not exactly "wireless".