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posted by janrinok on Thursday September 09 2021, @07:05AM   Printer-friendly

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)


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  • (Score: 3, Informative) by Immerman on Friday September 10 2021, @12:41AM

    by Immerman (3985) on Friday September 10 2021, @12:41AM (#1176448)

    Why?

    Microwaves and radio refer to different parts of the EM spectrum, just as infrared, visible light, UV, and gamma rays do.

    Admittedly the line between the two is somewhat vague, but the boundary is commonly considered to be somewhere around either 1m wavelength (300MHz), or 1GHz. The situation is not entirely unlike the difference between red and orange - two clearly different parts of the spectrum, but without a well-defined boundary between them.

    "Microwave rather than radio" translates pretty well to a one-or-more orders of magnitude increase in frequency, and a corresponding decrease in equipment size.

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