Electromagnetic metamaterial

Abstract

The invention provides an electromagnetic metamaterial capable of being used in the fields of radio energy transmission systems and electromagnetic protection, having magnetic conductivity close to zero, absorbing a low-frequency magnetic field and transparent to high-frequency electromagnetic waves. The electromagnetic metamaterial includes a substrate material, at least one of upper and lower surfaces of the substrate material is provided with a fractal structure layer, the fractal structure layer includes an annular metal wire arranged on the surface of the substrate material and a metal wire of a fractal structure; and the metal wire of the fractal structure is located inside the annular metal wire and is surrounded by the annular metal wire. In application of the electromagnetic metamaterial, electromagnetic radiation absorption of a low-frequency magnetic field and various harmonic waves can be realized, harm of the low-frequency magnetic field and various harmonic waves to surrounding equipment or personnel can be reduced, and at the same time, and since the electromagnetic metamaterial has the characteristics of a high-frequency transparent bidirectional electromagnetic material, the electromagnetic metamaterial can be used in the fields of radio energy transmission systems and electromagnetic protection.

Description

technical field [0001] The invention relates to the technical field of electromagnetic materials, in particular to an electromagnetic metamaterial with near-zero magnetic permeability, low-frequency magnetic field absorption and transparency to high-frequency electromagnetic waves, which can be used in the fields of radio energy transmission systems and electromagnetic protection. Background technique [0002] The hazards of electromagnetic radiation involve a wider and wider range, and have received great attention from people. With the continuous popularization of various wireless energy transmission devices such as wearable wireless devices and wireless charging devices, the strong magnetic fields and various harmonics caused by large currents in these systems will cause certain electromagnetic hazards to the environment and the human body. In order to communicate, the smooth flow of high-frequency signals is required. Therefore, it is necessary to design an advanced fun...

AI Technical Summary

Problems solved by technology

[0003] Absorbing materials usually refer to a class of materials that can effectively absorb incident electromagnetic waves and attenuate their energy, such as metamaterials made of Koch fractal structures and Hilbert. Different loss mechanisms convert incident electromagnetic waves into heat energy or other forms of energy to achieve the purpose of absorbing waves; while traditional low-frequency absorbing materials mainly use ferrite, which has the characteristics of high absorption rate, but has a narrow absorption frequency band , thicker thickness, higher density, fragile and higher price

[0004] In the prior art, there are also metamaterials with certain electromagnetic transparency, such as "an electromagnetic transparent metamaterial" shown in Chinese Patent No. 2011100618744. The basic principle is that several metals are arranged on the base material Branches, through which metal branches form some kind of two-dimensional circuit, so as to realize the transparent effect on electromagnetism, and through this patent, it can be known that the material branch structure shown in this patent is extremely many, and its structure itself is complex, but it has no effect on electromagnetism. While transparent, it does not have the function of absorbing low frequencies, and has the defect of single function

Another example is "an electromagnetic transparent metamaterial" shown in Chinese Patent No. 2011100618513. Its basic principle is also to set a corresponding number of two-dimensional and three-dimensional metal branches on the base material to form a corresponding microcircuit. Realize the transparent effect on electromagnetism. It can be known from this patent that this patent also has defects such as single function and complex structure.

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