Creation of electromagnetic non-radioactive sources

Figure 1. Conceptual approach to achieve (a) electrical anapoles, (b) NR power supplies, and (c) NR magnetic sources. Credit: DOI: 10.1103 / PhysRevLett.127.096804

An international team of researchers has developed a method for creating non-radioactive sources of electromagnetism.In their treatise published in the journal Physical review letter, The group describes their technique and how well it worked when testing the model based on their ideas.

For many years, physicists have been working on the idea of ​​”metamaterials,” which are macroscopic objects with alternating current that prevent the emission of electromagnetic energy. In 1957, Yakov Zeldovich came up with the idea of ​​Anapole, where parity violations occur. Current Generates an electric moment without poles. Since that time, some astrophysicists have suggested that such a condition can explain how dark matter remains hidden.

In this new initiative, researchers envisioned a system that would allow them to observe Anapol’s condition, model them, and create demonstration devices. The device consisted of a simple radiating antenna placed inside a hollow dielectric disk with a high dielectric constant. This allowed the disc to be smaller than the wavelength of the emitted radiation.Researchers note that the device design was as follows: Electromagnetic radiation The waves emitted by the antenna destructively interfere with the waves generated by the dielectric disc, where they cancel each other out. The team then modeled a simple setup on a computer that could simulate the behavior of electromagnetics. They found that by changing the frequency of the antenna, the antenna could be tuned to cancel the waves produced by the disc. The team then used the simulation results to create a real device for testing.

Lab constraints forced the team to create devices based on microwaves rather than microwaves. Radio frequency— They placed an 18mm antenna inside a 6.4mm disc and put it in an anechoic chamber.They used another antenna Measure the emission from the device after it is turned on. They found that this device could support complete suppression of far-field radiation.Researchers are their Terminal It can pave the way for the development of new types of wireless power transfer devices.

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For more information:
Esmaeel Zanganeh et al, Anapole Meta-Atoms: Nonradiating Electric and Magnetic Sources, Physical review letter (2021). DOI: 10.1103 / PhysRevLett.127.096804

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Creation of electromagnetic non-radioactive sources

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