SoylentNews is people
SoylentNews
Arthur T Knackerbracket has processed the following story:
An international team of researchers has developed a way to create non-radiating sources of electromagnetism. In their paper published in the journal Physical Review Letters, the group describes their technique and how well it worked when they tested a model based on their ideas.
For many years, physicists have grappled with the idea of "meta-atoms," macroscopic objects that have alternating current that prevents the emission of electromagnetic energy. In 1957, Yakov Zel'dovich came up with the idea of anapole states, where parity violations in electric current would produce electric moments with no poles. Since that time, some astrophysicists have suggested that such states could explain how dark matter remains hidden.
[...] Due to constraints in their lab, the team was forced to create a device based on microwaves rather than radio frequencies—they placed an 18-mm antenna inside of a 6.4-mm disk and put them into an anechoic chamber. They used another antenna to measure emissions from the device after it was turned on. They found the device able to support total suppression of far-field radiation. The researchers suggest their device could pave the way toward the development of new kinds of wireless power transfer devices.
Journal Reference:
Esmaeel Zanganeh, Andrey Evlyukhin, Andrey Miroshnichenko, et al. Anapole Meta-Atoms: Nonradiating Electric and Magnetic Sources, Physical Review Letters (DOI: 10.1103/PhysRevLett.127.096804)
(Score: 4, Insightful) by Rupert Pupnick on Thursday September 09 2021, @01:08PM (7 children)
How does one do wireless power transmission with a non-radiating electromagnetic source?
(Score: 1, Insightful) by Anonymous Coward on Thursday September 09 2021, @01:17PM (2 children)
Even without the long-distance electromagnetic radiation field, we can have localized magnetic fields do short-range wireless power transfer.
(Score: 2) by Rupert Pupnick on Thursday September 09 2021, @01:51PM (1 child)
Yes, but we already have that technology commonly available today. What new application or level of performance is made possible that we do not already have today?
(Score: 1, Insightful) by Anonymous Coward on Thursday September 09 2021, @05:24PM
The near field systems in common use still radiate to the far field. This is inefficient and, in the case of near field communications, insecure.
(Score: 4, Informative) by EvilSS on Thursday September 09 2021, @02:12PM (2 children)
(Score: 2) by Rupert Pupnick on Thursday September 09 2021, @05:44PM
Thanks for that link. It does narrow the description of possible applications to "near field wireless power transmission".
Would be more interesting if it had applications in the EMI suppression or anti-reflective coating (i.e. stealth) world, but looks like it operates on inherently narrowband principles.
(Score: 2, Interesting) by anubi on Friday September 10 2021, @12:22AM
One of my former work associates had an interest in what he called a Rodin Coil.
It was a peculiar way of winding wire onto ferrite rods or toroids.
It supposedly invoked some sort of projection phemomena, the toroid version producing vortices.
He had a rather elaborate lab setup and reported quite a few things that he could not explain. I did not witness the actual phenomena and considered it kinda like yet another bedini-motor wild goose chase for those ignorant of the laws of physics.
Apparently, these rodin rods emit their energy in such a manner as to converge at a specific point, kinda like an RF mimic of a lithotrypter or beamformer.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]
(Score: 0) by Anonymous Coward on Friday September 10 2021, @02:04AM
(How does one do wireless power transmission with a non-radiating electromagnetic source?)
Of course. You transmitted it, its just that they never will receive it.