Wireless power - again. - Page 1
Forum section: electronics / general

author: hamster_nz
author_rank: Super Contributor
timestamp: August 01, 2020, 08:09:30 pm
content: Just saw this, made me smile.https://www.stuff.co.nz/business/green-business/122266326/electricity-beamed-to-homes-could-do-away-with-wire-transmission-cablesQuoteAs we say over here.... Yeah, nah.

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 01, 2020, 08:36:40 pm
content: So the scammers have graduated from simple claims of charging electronics to the full Tesla quakery of replacing the grid and powering planes and ships...They know it's BS...just more scammers.

author: joeqsmith
author_rank: Super Contributor
timestamp: August 02, 2020, 02:24:21 am
content: Dr. William Brown

author: Mr.B
author_rank: Unknown
timestamp: August 02, 2020, 02:38:01 am
content: Over the last couple of months Stuff.co.nz have introduced a new by-line that they *stuff* in your face on every article.“Trustworthy, accurate and reliable news stories are more important now than ever.”It is a pity their hopelessly inadequate reporters cannot read the by-line.

author: Cerebus
author_rank: Super Contributor
timestamp: August 02, 2020, 03:05:36 am
content: Quote from: Mr.B on August 02, 2020, 02:38:01 amNewspapers that tell you that sort of thing are rather like broadcasters that claim to be "fair and balanced" or countries that feel it necessary to have "Democratic" in the name of their polity. The latter are always dictatorships and I leave you to work out what that says about the others.

author: hamster_nz
author_rank: Super Contributor
timestamp: August 02, 2020, 03:45:46 am
content: 'key' tech is a high efficiency rectenna -https://en.wikipedia.org/wiki/Rectenna- that might be vaild tech, but talk about overselling it!https://emrod.energy/use-cases/I guess if you want to power remote Pacific islands using microwave beams they must be flat-earthers???

author: Circlotron
author_rank: Super Contributor
timestamp: August 02, 2020, 06:21:46 am
content: Quote from: Cerebus on August 02, 2020, 03:05:36 amSame as when they use the word "people's"

author: Cerebus
author_rank: Super Contributor
timestamp: August 02, 2020, 02:03:29 pm
content: Sometimes they go for the full set, e.g. "People's Democratic Republic of <wherever>" and you know that the people aren't getting a look in, there's no democracy and there's no republicanism (small r sense). It's quite helpful really, once you know how to read it. And people say thatNewspeakis dead

author: joeqsmith
author_rank: Super Contributor
timestamp: August 02, 2020, 03:39:38 pm
content: Quote from: hamster_nz on August 02, 2020, 03:45:46 amI'm not sure if it was ever actually ever used. It has a lot of constraints compared with copper wire.https://livrepository.liverpool.ac.uk/18537/1/ZhangJinwei_Sep2013_18537.pdf

author: Cerebus
author_rank: Super Contributor
timestamp: August 02, 2020, 04:08:19 pm
content: The "rectenna" is confusingly similar in nomenclature to the "squaerial" which was one time in vogue here in the UK for reception of microwave satellite signals. I had to actually follow the link to discover that the two only bear similarities in being antennae of some sort.

author: ConKbot
author_rank: Super Contributor
timestamp: August 04, 2020, 02:58:56 pm
content: Man, if 5G make covid, I can't wait to see the turbo pandemic that something like that can make.

author: joeqsmith
author_rank: Super Contributor
timestamp: September 04, 2020, 02:21:13 am
content: Recent article on rectifying antennahttps://www.stripes.com/news/us/air-force-lab-working-on-process-to-beam-solar-power-from-space-to-earth-1.640722Old tech, new useThe “spider” project – Space Solar Power Incremental Demonstrations and Research, or SSPIDR – is actually building on technology created decades ago. Photovoltaic beaming, or wireless power transfer, was demonstrated in the 1970s, said SSPIDR project manager James Winter. It’s based on gathering solar energy with photovoltaic cells and then converting it to radio frequency for beaming from antennas to receivers.That process is used for satellite TV, whereby solar energy is used to propagate radio frequency that’s then sent to the ground for communications. In the case of wireless power transfer, the radio frequency is received by a “rectifying antenna” that converts the frequency back to electricity, Winter said.“The concept has been around a while,” Winter said. “With normal solar systems, you collect solar energy and convert it to direct current to charge up batteries on a satellite. … With a solar-to-radio-frequency module, there is no storage – you convert the solar energy to direct current and then to radio frequency with integrated circuits for transfer to a rectifying antenna that converts it back to direct current.”