Column-shaped electromagnetic wave stealth device with four-direction stealth effects

Abstract

The invention discloses a column-shaped electromagnetic wave stealth device with four-direction stealth effects. The column-shaped electromagnetic wave stealth device with the four-direction stealth effects comprises four first medium units and four second medium units, wherein the first medium units and the second medium units are isotropic and are transparent relative to incident electromagnetic waves, the refractive index of each first medium unit is larger than the refractive index of each second medium unit, the first medium units are column bodies, the cross sections of the column bodies are of isosceles triangle shapes, the second medium units are column bodies, and the cross sections of the column bodies are of isosceles triangle shapes or isosceles trapezoid shapes. Each second medium unit is arranged between every two adjacent first medium unit, adjacent second side walls are opposite to first side walls, and all third side walls face a stealth area. When the cross sections of the second medium units are of the isosceles triangle shapes, all fourth side walls face background media. When the cross sections of the second medium units are of the isosceles trapezoid shapes, all sixth side walls face the ground media and all seventh side walls face the stealth area. The column-shaped electromagnetic wave stealth device has the stealth effects of four directions, is insensitive to the polarization direction of the electromagnetic waves, and is suitable for a whole electromagnetic wave section.

Description

technical field [0001] The invention relates to a columnar electromagnetic wave cloaking device, which belongs to the field of electromagnetic wave cloaking. Background technique [0002] Electromagnetic stealth has always been a dream of human beings for a long time, but it has not been able to be realized. Electromagnetic wave refers to a wave in which energy and momentum are transmitted in the form of periodic fluctuations in space by electric and magnetic fields that oscillate in phase and are perpendicular to each other. The electromagnetic spectrum includes all possible frequencies of electromagnetic radiation, listed from low to high frequencies as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The electromagnetic spectrum is infinite and continuous. Generally, when the electromagnetic wave is irradiated on the object, it cannot be completely transmitted to the back of the object, but will be scattered on the object. Therefore...

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Problems solved by technology

[0005] Since the stealth device design method proposed by Pendry et al. requires the electromagnetic parameters of the materials used to vary with space, and requires the electromagnetic parameters of the materials to traverse all values ​​​​in the interval from 0 to infinity, the requirements for materials are very strict, and it is difficult to implement and expensive. At the same time, due to the severe dispersion, this material can only work in a very narrow frequency range, and the stealth device realized by this method is only effective for electromagnetic waves of a specific polarization, and cannot achieve stealth for arbitrary polarized electromagnetic waves, so There are great limitations in practical applications

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