CN105655718A - Two-dimensional unidirectional elliptical hiding device - Google Patents

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

The two dimension stealthy device of unidirectional ellipse

Technical field

The present invention relates to electromagnetic wave and control technical field, be specifically related to a kind of two-dimentional stealthy device of unidirectional ellipse.

Background technology

Stealthy from ancient times to the present it is always up the target that people yearn for. Scientist covers absorbing material on aircraft surfaces, and by the design to aircraft configuration, physical dimension, makes radar wave be absorbed after being irradiated on aircraft, reduces the aircraft reflection to radar wave, it is achieved that stealth fighter. But along with the development of Radar Technology and the extensive of air-ground radar are used, appear its weak point gradually by being absorbed into the stealthy mode of ejected wave, cannot realize again " stealthy ". In recent years, the another kind of stealthy mode based on the non-absorbing of transform optics is risen gradually, its principle is to utilize transform optics to design the stealthy medium with certain electric magnetic parameter, control electromagnetic wave propagation path in stealthy device, and when electromagnetic wave outgoing, its amplitude and phase place are repaired, make there is no during object to be as good as in outgoing wave and this region. This is for significant from truly realizing the aspects such as stealthy, electromagnetic shielding.

Stealthy device based on transform optics needs non-homogeneous and anisotropic complicated electromagnetic parameter, for stealthy device is carried out structure simplification, optic camouflage device designed at present is generally to reduce its scope of application for cost, adopt the mode that three-dimensional is reduced to two dimension, and specify to realize stealthy to the incident electromagnetic wave of single direction.

Summary of the invention

It is contemplated that at least solve one of above-mentioned technical problem.

For this, it is an object of the present invention to propose a kind of two-dimentional stealthy device of unidirectional ellipse.

To achieve these goals, embodiment of the invention discloses that a kind of two-dimentional stealthy device of unidirectional ellipse, described stealthy device is Elliptic Cylinder structure, described stealthy device by cylindrical structure and hollow stealthy region (2) and be positioned at stealthy region (2) outside stealthy areas of dielectric (1) form, the ellipsoidal structure of the bottom surface of described stealthy device is cut in the circular configuration of the bottom surface in stealthy region (2) outside two end points places of short-axis direction, the electromagnetic parameter of stealthy areas of dielectric (1) includes magnetic permeability �� and DIELECTRIC CONSTANT ��, magnetic permeability �� and DIELECTRIC CONSTANT �� meet the following conditions respectively: in first quartile and the second quadrant:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& -\frac{x}{\sqrt{R^2-x^2}}& 0\\ -\frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& -\frac{x}{\sqrt{R^2-x^2}}& 0\\ -\frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

In third quadrant and fourth quadrant:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& \frac{x}{\sqrt{R^2-x^2}}& 0\\ \frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& \frac{x}{\sqrt{R^2-x^2}}& 0\\ \frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

Wherein, x is the coordinate of the short-axis direction of stealthy areas of dielectric (1), y is the coordinate of stealthy areas of dielectric (1) long axis direction, z is the coordinate of stealthy areas of dielectric (1) short transverse, R is the minor axis radius of stealthy region (1), and n is the ratio of elliptic region major axis radius and minor axis radius.

The two-dimentional stealthy device of unidirectional ellipse of one according to embodiments of the present invention, by designing the shape in stealthy medium and stealthy region and constituting the electromagnetic parameter of stealthy dielectric material, and the electromagnetic parameter of stealthy medium is carried out sliding-model control, the electromagnetic parameter in region is replaced with the electromagnetic parameter of central spot in each unit area, complicated continuous print electromagnetic parameter is capable of, and incident electromagnetic wave is able to stealthy by the barrier being positioned at stealthy region.

It addition, the two-dimentional stealthy device of unidirectional ellipse of one according to the above embodiment of the present invention, it is also possible to there is following additional technical characteristic:

Further, by designing the shape in stealthy medium and stealthy region and constituting the electromagnetic parameter of stealthy dielectric material, and the electromagnetic parameter of stealthy medium is carried out sliding-model control, the electromagnetic parameter in region is replaced with the electromagnetic parameter of central spot in each unit area, complicated continuous print electromagnetic parameter is capable of, and incident electromagnetic wave is able to stealthy by the barrier being positioned at stealthy region.

Further, described metamaterial structure is to be made up of metal openings ring (5) array of sub-wavelength dimensions, metal openings ring (5) is concave structure, the opening of metal openings ring (5) is positioned at the recess of concave structure, there is metal openings ring (5) array of period profile in the upper processing of PCB substrate (7) by the mode of printed circuit board (PCB), metal openings ring (5) array along x ' direction and y ' directional spreding is linked together the metal openings ring metamaterial structure constituted in a belt-like zone by the groove (6) in PCB substrate (7).

Further, the height-adjustable of the radius R of the bottom surface short-axis direction of described stealthy device and described stealthy device.

The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:

Fig. 1 is the plan structure schematic diagram of the two dimension stealthy device of unidirectional ellipse of one embodiment of the invention;

Fig. 2 is the stealth effect schematic diagram of the two dimension stealthy device of unidirectional ellipse of one embodiment of the invention;

Fig. 3 is the stealthy medium electromagnetic parameter discretization schematic diagram of the two dimension stealthy device of unidirectional ellipse of one embodiment of the invention;

Fig. 4 is the metal openings ring metamaterial structure schematic diagram of one embodiment of the invention.

In figure: the stealthy areas of dielectric of 1-; The stealthy region of 2-; 3-plane wave emission source; 4-electromagnetic wave equiphase surface; 5-metal openings ring; 6-groove; 7-PCB substrate.

Detailed description of the invention

Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish. The embodiment described below with reference to accompanying drawing is illustrative of, and is only used for explaining the present invention, and is not considered as limiting the invention.

In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention. additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.

In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly;Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.

With reference to as explained below and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention. Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but it is to be understood that the scope of embodiments of the invention is not limited. On the contrary, all changes within the scope of embodiments of the invention include falling into attached claims spirit and intension, amendment and equivalent.

First the operation principle of the present invention is introduced: utilize the electromagnetic parameter required for the stealthy medium of transform optics principle design, the propagation path that stealthy device can control incident electromagnetic wave is made to walk around stealthy region, keep the direction of propagation consistent with incident direction when outgoing, and electromagnetic phase place is repaired, the equiphase surface keeping outgoing wave is a plane. The stealthy device meeting requirements above designed based on transform optics for incident electromagnetic wave its electromagnetic property shown such as surrounding consistent, what namely can realize stealthy intra-zone barrier is stealthy.

The stealthy medium gone out designed by transform optics has anisotropic dielectric constant heterogeneous and pcrmeability, realizes this stealthy device to test, and the electromagnetic parameter of stealthy medium is carried out sliding-model control. Owing to this stealthy medium electromagnetic parameter heterogeneous is only relevant to x-axis coordinate, therefore stealthy medium being divided into multiple belt-like zone that width is sub-wavelength dimensions being parallel to y-axis, the electromagnetic parameter in each region is replaced by the electromagnetic parameter of regional center point. Electromagnetic parameter matrix in each region is carried out diagonalization so that it is the only component in x ', y ' and z ' tri-directions, in each belt-like zone, place metamaterial structure unit such as metal openings ring realize the electromagnetic parameter in three directions in this region.

The core of metal openings ring metamaterial structure is that the EMR electromagnetic resonance characteristic utilizing metal openings ring is to realize dielectric constant and the pcrmeability of the specific anisotropy required by transform optics principle, according to Lenz's law and the law of electromagnetic induction, it is in the metal openings ring in alternating electromagnetic field and can produce alternating current, it is thus possible to produce magnetic resonance on the direction being perpendicular to becket plane, the magnetic permeability �� in y ' and x ' direction therefore can be realized along the metal openings ring array of x ' direction and y ' directional spreding_y��And ��_x��, utilize both the above circuit board periodic array in x ' o ' y ' plane to realize the axial pcrmeability �� of z '_z��. owing to the dielectric constant of metal openings ring and pcrmeability are the functions of incoming electromagnetic wave frequency, utilize the EMR electromagnetic resonance characteristic of metal openings ring, regulate geometric parameter (the metal openings ring opening part gap length of becket in both direction, the live width of becket, adjacent two parallel circuit boards spacings, the thickness etc. of circuit board), make under a certain working frequency range, pcrmeability and dielectric constant on several different directions reach the value required by transform optics theory simultaneously, array arrangement thereby through metal openings ring can be achieved with the control to electromagnetic wave propagation path Yu phase place, make electromagnetic wave at stealthy media, walk around stealthy region, reach stealthy effect.

Below in conjunction with accompanying drawing, the two dimension stealthy device of unidirectional ellipse according to embodiments of the present invention is described.

Fig. 1 is the plan structure schematic diagram of the two dimension stealthy device of unidirectional ellipse of one embodiment of the invention, and Fig. 2 is the stealth effect schematic diagram of the two dimension stealthy device of unidirectional ellipse of one embodiment of the invention. Refer to Fig. 1 and Fig. 2, the two dimension stealthy device of unidirectional ellipse in the embodiment of the present invention is Elliptic Cylinder structure. Stealthy device is by the stealthy region 2 of cylindrical structure and hollow and is positioned at the stealthy areas of dielectric 1 outside stealthy region 2 and forms. The ellipsoidal structure of the bottom surface of stealthy device is cut in the circular configuration of the bottom surface in stealthy region 2 outside two end points places of short-axis direction. The electromagnetic parameter of stealthy areas of dielectric 1 includes magnetic permeability �� and DIELECTRIC CONSTANT ��, magnetic permeability �� and DIELECTRIC CONSTANT �� and meets the following conditions respectively:

In first quartile and the second quadrant:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& -\frac{x}{\sqrt{R^2-x^2}}& 0\\ -\frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& -\frac{x}{\sqrt{R^2-x^2}}& 0\\ -\frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

In third quadrant and fourth quadrant:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& \frac{x}{\sqrt{R^2-x^2}}& 0\\ \frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& \frac{x}{\sqrt{R^2-x^2}}& 0\\ \frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

Wherein, x is the coordinate of the short-axis direction of stealthy areas of dielectric 1, y is the coordinate of stealthy areas of dielectric 1 long axis direction, z is the coordinate of stealthy areas of dielectric 1 short transverse, R is the minor axis radius in stealthy region 1, n is the ratio of elliptic region major axis radius and minor axis radius, and first quartile, the second quadrant, third quadrant and fourth quadrant distinguish corresponding x-axis positive direction region and y-axis positive direction region, x-axis negative direction region and y-axis positive direction region, x-axis negative direction region and y-axis negative direction region, x-axis positive direction region and y-axis negative direction region. By stealthy areas of dielectric 1 diverse location is arranged different electromagnetic parameters, thus realizing the control to electromagnetic wave propagation path Yu phase place, making electromagnetic wave propagate in stealthy areas of dielectric 1, walking around stealthy region 2, reach stealthy effect.

In one embodiment of the invention, stealthy areas of dielectric 1 includes multiple belt-like zone being parallel to y-axis direction. The electromagnetic parameter of each belt-like zone is replaced by the electromagnetic parameter of regional center point, and the electromagnetic parameter matrix in each belt-like zone is carried out diagonalization, makes electromagnetic parameter matrix only have the component in x ', y ' and z ' tri-directions. In each described belt-like zone, place metamaterial structure unit realize the electromagnetic parameter in three directions in this region.

Specifically, refer to Fig. 3, owing to the electromagnetic parameter of stealthy areas of dielectric 1 is only relevant to x-axis coordinate, therefore stealthy medium can be divided into multiple belt-like zone that width is sub-wavelength dimensions being parallel to y-axis. the electromagnetic parameter in each region is replaced by the electromagnetic parameter of regional center point, such electromagnetic parameter has just been separated into ladder distribution by continuous distribution, it is simple to realize by the mode of structure Meta Materials.

In an embodiment of the invention, metamaterial structure is to be made up of metal openings ring (5) array of sub-wavelength dimensions, metal openings ring (5) is concave structure, the opening of metal openings ring (5) is positioned at the recess of concave structure, there is metal openings ring (5) array of period profile in the upper processing of PCB substrate (7) by the mode of printed circuit board (PCB), metal openings ring (5) array along x ' direction and y ' directional spreding is linked together the metal openings ring metamaterial structure constituted in a belt-like zone by the groove (6) in PCB substrate (7).

Specifically, refer to Fig. 4, the normal direction of metal openings ring 5 is x ' or y ' direction, when being in alternating electromagnetic field, produce alternating current in metal openings ring 5, produce magnetic resonance in normal direction, change the geometric parameter of metal openings ring 5, it is possible to realize required pcrmeability in normal direction;Groove 6 in PCB substrate 7 is along x ' or y ' directional spreding, for interfixing between the circuit board of both direction distribution.

In one embodiment of the invention, the radius R of the bottom surface short-axis direction of stealthy device and the height-adjustable of described stealthy device, to realize the stealthy of different size of barrier.

For enabling the those skilled in the art understanding present invention clearly, the two dimension stealthy device of unidirectional ellipse of the present invention will be described by following embodiment.

[embodiment one]

Taking n is 2, then, in first and second quadrant, the material constituting stealthy areas of dielectric 1 has following electromagnetic parameter:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}2& -\frac{2x}{\sqrt{R^2-x^2}}& 0\\ -\frac{2x}{\sqrt{R-x^2}}& \frac{1}{2}+\frac{2x^2}{R^2-x^2}& 0\\ 0& 0& 2\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}2& -\frac{2x}{\sqrt{R^2-x^2}}& 0\\ -\frac{2x}{\sqrt{R-x^2}}& \frac{1}{2}+\frac{2x^2}{R^2-x^2}& 0\\ 0& 0& 2\end{array}\right)$

In third and fourth quadrant, the material constituting stealthy medium has following electromagnetic parameter:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}2& \frac{2x}{\sqrt{R^2-x^2}}& 0\\ \frac{2x}{\sqrt{R^2-x^2}}& \frac{1}{2}+\frac{2x^2}{R^2-x^2}& 0\\ 0& 0& 2\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}2& \frac{2x}{\sqrt{R^2-x^2}}& 0\\ \frac{2x}{\sqrt{R^2-x^2}}& \frac{1}{2}+\frac{2x^2}{R^2-x^2}& 0\\ 0& 0& 2\end{array}\right)$

The electromagnetic parameter of stealthy areas of dielectric 1 is carried out sliding-model control, is positioned at central point in first quartileThe belt-like zone at place is example, and the electromagnetic parameter in this region is equal to the electromagnetic parameter of central spot:

$\mathrm{\μ}=\mathrm{\ϵ}=\left(\begin{array}{ccc}2& -\frac{2\sqrt{3}}{3}& 0\\ -\frac{2\sqrt{3}}{3}& \frac{7}{6}& 0\\ 0& 0& 2\end{array}\right)$

It is carried out diagonalization process, makes it to realize with Meta Materials, there is electromagnetic parameter:

��_x��=��_x��=0.3558

��_y��=��_y��=2.8109

��_z��=��_z��=2.0000

Wherein x ' axle and y ' axle are x-axis and y-axis turns clockwise 54.92 �� and obtains, and z ' axle overlaps with z-axis. The metamaterial structure unit such as metal openings ring 5 with above-mentioned electromagnetic parameter is placed as this stealthy areas of dielectric 1 in this belt-like zone.

[embodiment two]

Taking n is 3, then, in first and second quadrant, the material constituting stealthy areas of dielectric 1 has following electromagnetic parameter:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{3}{2}& -\frac{3x}{2\sqrt{R^2-x^2}}& 0\\ -\frac{3x}{2\sqrt{R^2-x^2}}& \frac{2}{3}+\frac{3x^2}{2(R^2-X^2)}& 0\\ 0& 0& \frac{3}{2}\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{3}{2}& -\frac{3x}{2\sqrt{R^2-x^2}}& 0\\ -\frac{3x}{2\sqrt{R^2-x^2}}& \frac{2}{3}+\frac{3x^2}{2(R^2-x^2)}& 0\\ 0& 0& \frac{3}{2}\end{array}\right)$

In third and fourth quadrant, the material constituting stealthy medium has following electromagnetic parameter:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{3}{2}& \frac{3x}{2\sqrt{R^2-x^2}}& 0\\ \frac{3x}{2\sqrt{R^2-x^2}}& \frac{2}{3}+\frac{3x^2}{2(R^2-x^2)}& 0\\ 0& 0& \frac{3}{2}\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{3}{2}& \frac{3x}{2\sqrt{R^2-x^2}}& 0\\ \frac{3x}{2\sqrt{R^2-x^2}}& \frac{2}{3}+\frac{3x^2}{2(R^2-x^2)}& 0\\ 0& 0& \frac{3}{2}\end{array}\right)$

The electromagnetic parameter of stealthy areas of dielectric 1 is carried out sliding-model control, is positioned at central point in first quartileThe belt-like zone at place is example, and the electromagnetic parameter in this region is equal to the electromagnetic parameter of central spot:

$\mathrm{\μ}=\mathrm{\ϵ}=\left(\begin{array}{ccc}\frac{3}{2}& -\frac{\sqrt{3}}{2}& 0\\ -\frac{\sqrt{3}}{2}& \frac{7}{6}& 0\\ 0& 0& \frac{3}{2}\end{array}\right)$

It is carried out diagonalization process, makes it to realize with Meta Materials, there is electromagnetic parameter:

��_x��=��_x��=0.4514

��_y��=��_y��=2.2153

��_z��=��_z��=1.5000

Wherein x ' axle and y ' axle are x-axis and y-axis turns clockwise 50.45 �� and obtains, and z ' axle overlaps with z-axis. The metamaterial structure unit such as metal openings ring 5 with above-mentioned electromagnetic parameter is placed as the stealthy medium in this region in this belt-like zone.

[embodiment three]

Taking n is 4, then, in first and second quadrant, the material constituting stealthy medium has following electromagnetic parameter:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{4}{3}& -\frac{4x}{3\sqrt{R^2-x^2}}& 0\\ -\frac{4x}{3\sqrt{R^2-x^2}}& \frac{3}{4}+\frac{4x^2}{3(R^2-x^2)}& 0\\ 0& 0& \frac{4}{3}\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{4}{3}& -\frac{4x}{3\sqrt{R^2-x^2}}& 0\\ -\frac{4x}{3\sqrt{R^2-x^2}}& \frac{3}{4}+\frac{4x^2}{3(R^2-x^2)}& 0\\ 0& 0& \frac{4}{3}\end{array}\right)$

In third and fourth quadrant, the material constituting stealthy medium has following electromagnetic parameter:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{4}{3}& \frac{4x}{3\sqrt{R^2-x^2}}& 0\\ \frac{4x}{3\sqrt{R^2-x^2}}& \frac{3}{4}+\frac{4x^2}{3(R^2-x^2)}& 0\\ 0& 0& \frac{4}{3}\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\left(\begin{array}{ccc}\frac{4}{3}& \frac{4x}{3\sqrt{R^2-x^2}}& 0\\ \frac{4x}{3\sqrt{R^2-x^2}}& \frac{3}{4}+\frac{4x^2}{3(R^2-x^2)}& 0\\ 0& 0& \frac{4}{3}\end{array}\right)$

The electromagnetic parameter of stealthy medium is carried out sliding-model control, is positioned at central point in first quartileThe belt-like zone at place is example, and the electromagnetic parameter in this region is equal to the electromagnetic parameter of central spot:

$\mathrm{\μ}=\mathrm{\ϵ}=\left(\begin{array}{ccc}\frac{4}{3}& -\frac{4\sqrt{3}}{9}& 0\\ -\frac{4\sqrt{3}}{9}& \frac{43}{36}& 0\\ 0& 0& \frac{4}{3}\end{array}\right)$

It is carried out diagonalization process, makes it to realize with Meta Materials, there is electromagnetic parameter:

��_x��=��_x��=0.4910

��_y��=��_y��=2.0368

��_z��=��_z��=1.3333

Wherein x ' axle and y ' axle are x-axis and y-axis turns clockwise 47.58 �� and obtains, and z ' axle overlaps with z-axis. In this belt-like zone, place the metamaterial structure unit such as metal openings ring with above-mentioned electromagnetic parameter be used as the stealthy medium in this region.

It addition, other of the stealthy device of the unidirectional ellipse of the two dimension of the embodiment of the present invention is constituted and effect is all known for a person skilled in the art, in order to reduce redundancy, do not repeat.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.

Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: these embodiments can be carried out multiple change, amendment, replacement and modification when without departing from principles of the invention and objective, the scope of the present invention is by claim and description equivalency thereof.

Claims (4)

1. the two dimension stealthy device of unidirectional ellipse, it is characterized in that, described stealthy device is Elliptic Cylinder structure, described stealthy device by cylindrical structure and hollow stealthy region (2) and be positioned at stealthy region (2) outside stealthy areas of dielectric (1) form, the ellipsoidal structure of the bottom surface of described stealthy device is cut in the circular configuration of the bottom surface in stealthy region (2) outside two end points places of short-axis direction, the electromagnetic parameter of stealthy areas of dielectric (1) includes magnetic permeability �� and DIELECTRIC CONSTANT ��, magnetic permeability �� and DIELECTRIC CONSTANT �� meet the following conditions respectively:

In first quartile and the second quadrant:

$\mathrm{\μ}=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& -\frac{x}{\sqrt{R^2-x^2}}& 0\\ -\frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& -\frac{x}{\sqrt{R^2-x^2}}& 0\\ -\frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

In third quadrant and fourth quadrant:

$P=\left(\begin{array}{ccc}{\mathrm{\μ}}_{xx}& {\mathrm{\μ}}_{xy}& {\mathrm{\μ}}_{xz}\\ {\mathrm{\μ}}_{yx}& {\mathrm{\μ}}_{yy}& {\mathrm{\μ}}_{yz}\\ {\mathrm{\μ}}_{zx}& {\mathrm{\μ}}_{zy}& {\mathrm{\μ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& \frac{x}{\sqrt{R^2-x^2}}& 0\\ \frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

$\mathrm{\ϵ}=\left(\begin{array}{ccc}{\mathrm{\ϵ}}_{xx}& {\mathrm{\ϵ}}_{xy}& {\mathrm{\ϵ}}_{xz}\\ {\mathrm{\ϵ}}_{yx}& {\mathrm{\ϵ}}_{yy}& {\mathrm{\ϵ}}_{yz}\\ {\mathrm{\ϵ}}_{zx}& {\mathrm{\ϵ}}_{zy}& {\mathrm{\ϵ}}_{zz}\end{array}\right)=\frac{n}{n-1}\left(\begin{array}{ccc}1& \frac{x}{\sqrt{R^2-x^2}}& 0\\ \frac{x}{\sqrt{R^2-x^2}}& {\left(\frac{n-1}{n^2}\right)}^2+\frac{x^2}{(R^2-x^2)}& 0\\ 0& 0& 1\end{array}\right)$

Wherein, x is the coordinate of the short-axis direction of stealthy areas of dielectric (1), y is the coordinate of stealthy areas of dielectric (1) long axis direction, z is the coordinate of stealthy areas of dielectric (1) short transverse, R is the minor axis radius of stealthy region (1), and n is the ratio of elliptic region major axis radius and minor axis radius.

2. the stealthy device of the unidirectional ellipse of two dimension according to claim 1, it is characterized in that, stealthy areas of dielectric (1) includes multiple belt-like zone being parallel to y-axis direction, the electromagnetic parameter of each described belt-like zone is replaced by the electromagnetic parameter of regional center point, electromagnetic parameter matrix in each described belt-like zone is carried out diagonalization, described electromagnetic parameter matrix is made to only have x ', the component in tri-directions of y ' and z ', places metamaterial structure unit in each described belt-like zone and realizes the electromagnetic parameter in three directions in this region.

3. the stealthy device of the unidirectional ellipse of two dimension according to claim 2, it is characterized in that, described metamaterial structure is to be made up of metal openings ring (5) array of sub-wavelength dimensions, metal openings ring (5) is concave structure, the opening of metal openings ring (5) is positioned at the recess of concave structure, there is metal openings ring (5) array of period profile in the upper processing of PCB substrate (7) by the mode of printed circuit board (PCB), metal openings ring (5) array along x ' direction and y ' directional spreding is linked together the metal openings ring metamaterial structure constituted in a belt-like zone by the groove (6) in PCB substrate (7).

4. according to the arbitrary described two dimension stealthy device of unidirectional ellipse of claim 1-3, it is characterised in that the radius R of the bottom surface short-axis direction of described stealthy device and the height-adjustable of described stealthy device.