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Two-dimensional one-way elliptical cloaking device

A device, ellipse technology, applied in the field of two-dimensional one-way elliptical stealth devices, can solve the problem of reducing the scope of application

Active Publication Date: 2018-08-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Stealth devices based on transformation optics require non-uniform and anisotropic complex electromagnetic parameters. In order to simplify the structure of stealth devices, the currently designed optical stealth devices generally reduce the three-dimensional to two-dimensional at the cost of reducing their scope of application. method, and it is stipulated that only the incident electromagnetic waves in a single direction can be invisible

Method used

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  • Two-dimensional one-way elliptical cloaking device
  • Two-dimensional one-way elliptical cloaking device
  • Two-dimensional one-way elliptical cloaking device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Taking n as 2, in the first and second quadrants, the materials constituting the stealth medium area 1 have the following electromagnetic parameters:

[0049]

[0050]

[0051] In the third and fourth quadrants, the materials constituting the stealth medium have the following electromagnetic parameters:

[0052]

[0053]

[0054] The electromagnetic parameters of the stealth medium area 1 are discretized, and the center point in the first quadrant is located at Take the banded region at as an example, the electromagnetic parameters in this region are equal to the electromagnetic parameters at the center point:

[0055]

[0056] Diagonalize it so that it can be realized with metamaterials, with electromagnetic parameters:

[0057] mu x′ =ε x′ =0.3558

[0058] mu y′ =ε y′ =2.8109

[0059] mu z′ =ε z′ =2.0000

[0060] The x' axis and the y' axis are obtained by rotating the x axis and the y axis clockwise by 54.92°, and the z' axis coincides with ...

Embodiment 2

[0062] Taking n as 3, in the first and second quadrants, the materials constituting the stealth medium area 1 have the following electromagnetic parameters:

[0063]

[0064]

[0065] In the third and fourth quadrants, the materials constituting the stealth medium have the following electromagnetic parameters:

[0066]

[0067]

[0068] The electromagnetic parameters of the stealth medium area 1 are discretized, and the center point in the first quadrant is located at Take the banded region at as an example, the electromagnetic parameters in this region are equal to the electromagnetic parameters at the center point:

[0069]

[0070] Diagonalize it so that it can be realized with metamaterials, with electromagnetic parameters:

[0071] mu x′ =ε x′ =0.4514

[0072] mu y′ =ε y′ =2.2153

[0073] mu z′ =ε z′ =1.5000

[0074] The x' axis and the y' axis are obtained by rotating the x axis and the y axis clockwise by 50.45°, and the z' axis coincides with ...

Embodiment 3

[0076] Taking n as 4, in the first and second quadrants, the materials constituting the stealth medium have the following electromagnetic parameters:

[0077]

[0078]

[0079] In the third and fourth quadrants, the materials constituting the stealth medium have the following electromagnetic parameters:

[0080]

[0081]

[0082] The electromagnetic parameters of the stealth medium are discretized, and the center point in the first quadrant is located at Take the banded region at as an example, the electromagnetic parameters in this region are equal to the electromagnetic parameters at the center point:

[0083]

[0084] Diagonalize it so that it can be realized with metamaterials, with electromagnetic parameters:

[0085] mu x′ =ε x′ =0.4910

[0086] mu y′ =ε y′ =2.0368

[0087] mu z′ =ε z′ =1.3333

[0088] The x' axis and the y' axis are obtained by rotating the x axis and the y axis clockwise by 47.58°, and the z' axis coincides with the z axis. A...

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Abstract

The invention discloses a two-dimensional unidirectional elliptical hiding device which is of an elliptical column structure. The hiding device consists of a hollow hiding region which is of a cylindrical structure and a hidden medium region positioned on the outer side of the hiding region, wherein two end points of the elliptical structure at the bottom face of the hiding device in the short axle direction are externally tangent to the circular structure at the bottom face of the hiding region to discretize electromagnetic parameters of the hidden medium region; and the electromagnetic parameter at the center point in each unit region replaces the electromagnetic parameter in the region. The two-dimensional unidirectional elliptical hiding device has the following advantages that the hiding range is defined within electromagnetic waves incident into a two-dimensional plane in the single direction, so that the electromagnetic parameters of required hiding media are simplified; and hiding devices applied to obstacles with different sizes can be designed by adjusting the size parameters of the hiding devices as required.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave control, in particular to a two-dimensional one-way elliptical stealth device. Background technique [0002] Stealth has always been the goal that people yearn for from ancient times to the present. Scientists cover the surface of the aircraft with absorbing materials, and through the design of the shape and geometric dimensions of the aircraft, the radar waves are absorbed after being irradiated on the aircraft, reducing the reflection of the aircraft on the radar waves, and realizing the stealth fighter. However, with the development of radar technology and the widespread use of ground-to-air radar, the stealth method by absorbing incident waves has gradually revealed its shortcomings, and it is no longer possible to achieve "stealth". In recent years, another non-absorbing stealth method based on transformation optics has gradually emerged. The principle is to use transformation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/08H01Q15/00
CPCH01Q15/0086H01Q15/08
Inventor 赵乾彭瑞光肖宗祺孟永钢
Owner TSINGHUA UNIV