CN203445242U

CN203445242U - Anisotropic fisheye-luneberg ultra-surface lens

Info

Publication number: CN203445242U
Application number: CN201320442293.XU
Authority: CN
Inventors: 崔铁军; 万向
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2013-07-23
Filing date: 2013-07-23
Publication date: 2014-02-19
Anticipated expiration: 2023-07-23

Abstract

The utility model discloses an anisotropic fisheye-luneberg ultra-surface lens, which comprises a dielectric substrate and a surface metal structure arranged on the dielectric substrate and formed by periodic rank arrangement of a plurality of structure units. The surface metal structure is centrosymmetric, and groove depths of the structure units are shaded from the symmetry center to the periphery. The ultra-surface lens disclosed by the utility model has the advantages of realizing separate regulation on surface plasmons in different propagation directions, improving the integration of surface waves in the application and providing higher flexibility. The lens antenna is simple in manufacturing, mature in technology, low in price, and convenient in popularization; and through zooming structure parameters (including lengths and widths of the structure units, and groove depths of the structure units), the anisotropic fisheye-luneberg ultra-surface lens can be used in microwaves, millimeter waves, terahertz waves and other different wave bands.

Description

The super surperficial lens of a kind of anisotropic flake-Long Bai

Technical field

The utility model relates to surface wave device, especially a kind of surface phasmon lens based on novel artificial electromagnetic material, and these super surperficial lens have the characteristic of dragon uncle's lens and fish-eye lens simultaneously.

Background technology

Artificial super surperficial (metasurfaces), owing to having the processing of being easy to, simple in structure, the feature that low section and loss are low, receives extensive concern recently.Current, technical staff has designed and has applied a series of based on artificial super surperficial new device, such as the converter of radiated wave and surface wave, surface wave antenna, based on artificial super surperficial polarization converter etc.

But these product great majority are unifunctional.

Utility model content

Utility model object: the utility model will provide the super surperficial lens of a kind of anisotropic flake-Long Bai, while making it work as excitaton source along artificial super surperficial different optical axises excitation, show as respectively dragon uncle's lens and fish-eye lens, therefore at least there are two kinds of functions, to improve the integrated level of surface wave device in application.

Technical scheme: a kind of super surperficial lens, comprise dielectric substrate and be arranged on surface metal structure in dielectric substrate, that arrange and form by a plurality of construction units periodicity ranks, described surface metal structure is in a center of symmetry, and the groove depth of described construction unit is from symmetrical centre to periphery gradual change.

Described construction unit comprises U-shaped sheet metal.The groove depth of described U-shaped sheet metal reduces to periphery gradually from symmetrical centre.The groove depth of the U-shaped sheet metal equating apart from symmetrical centre equates.The groove depth of described construction unit reduces to periphery gradually from symmetrical centre.

Different based on isotropic feature from existing lens, the anisotropic artificial super surperficial lens of the utility model have different refractive indexes on different optical axis directions, and this just provides physical basis for realizing multifunction device.The utility model can design according to the method based on isotropic material respectively along different optical axises, but the refractive index of design meets different distributions, has so just realized multifunction device.

Beneficial effect: super surperficial lens of the present utility model can be realized the independent regulation and control to the surface phasmon of the different directions of propagation, have improved the integrated level of surface wave in application, have higher flexibility; That lens antenna of the present utility model is made is simple, technical maturity, price are not high, be convenient to promote; By the convergent-divergent of structural parameters, the utility model goes for the different-wavebands such as microwave, millimeter wave and THz wave.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 a is the schematic diagram of the utility model construction unit, and Fig. 2 b is the dispersion characteristics schematic diagram of the utility model construction unit;

Fig. 3 is relatively schematic diagram of not refraction index profile in the same way of the present utility model and theoretical value;

Fig. 4 when encouraging in the y-direction, the emulation distribution map of electric field Ex component on horizontal plane;

Fig. 5 a when encouraging in the y-direction, the emulation distribution map of electric field Ex component on vertical tangent plane;

Fig. 5 b is the enlarged diagram that in Fig. 5 a, A is ordered;

Fig. 6 when encouraging in the x-direction, the emulation distribution map of electric field Ey component on horizontal plane;

Fig. 7 a when encouraging in the x-direction, the emulation distribution map of electric field Ey component on vertical tangent plane;

Fig. 7 b is the enlarged diagram that in Fig. 7 a, B is ordered;

Fig. 8 when encouraging in the y-direction, the test distribution map of electric field Ex component on horizontal plane;

Fig. 9 when encouraging in the x-direction, the test distribution map of electric field Ey component on horizontal plane;

Figure 10 is the pictorial diagram of the utility model dual function surface ripple lens.

Embodiment

As shown in Fig. 1 and Fig. 2 a, the surface phasmon lens of the utility model based on novel artificial electromagnetic material mainly comprise dielectric substrate 1 and surface metal structure 2.Surface metal structure 2 is arranged and is formed by a plurality of construction units 3 periodicity ranks.Surface metal structure 2 is in a center of symmetry.Construction unit main body is U-shaped sheet metal, and its groove depth reduces to periphery gradually from symmetrical centre, and the groove depth of the U-shaped sheet metal equating apart from symmetrical centre equates.The surface refractive index that said structure makes lens body, by center of circle graded profile laterally, equates with equidistant position, center of circle refractive index.

Particularly, U-shaped sheet metal is etched in dielectric substrate; Dielectric-slab is polytetrafluoroethylene material, and dielectric constant is 2.2.Dispersion curve shows that lens have different refractive indexes on different optical axis directions, and the novel artificial electromagnetic material unit that adopted is anisotropic (a direction is different with the arousal effect in b direction).In this embodiment, U-shaped sheet metal is lined up even number capable (y in Fig. 1 to) and even number row (x in Fig. 1 to), wherein, the direction of sheet metal groove and x to or it is oppositely consistent.In different directions, the symmetric mode of U-shaped sheet metal is different: in the symmetric relation between different rows, U-shaped sheet metal becomes " back-to-back " to arrange along symmetry axis; In the symmetric relation between different lines, U-shaped sheet metal becomes " shoulder to shoulder " to arrange along symmetry axis.

Dispersion curve in Fig. 2 b is the value gained by scanning h, and wherein h is increased to 3.4mm by step-length 0.3mm from 1, and corresponding curve is protected from inside to outside according to the direction shown in arrow.This variation tendency shows: by controlling the size of h, control the size of refractive index, can realize needed refraction index profile.

As shown in Figure 3, adopt the U-shaped sheet metal structure of different groove depth h by the position different, designed lens show different refraction index profile in x direction and y direction, with theoretical value relatively show that it has the good goodness of fit.

As shown in Figure 4, when encourage from y direction in source, field pattern shows the effect of dragon uncle lens.As shown in Figure 5 a, when encourage from y direction in source, field pattern shows that electromagnetic wave is bound in lens surface.Fig. 5 b has further reflected excitation orientation.

As shown in Figure 6, when encourage from x direction in source, field pattern shows the effect of fish-eye lens.As shown in Figure 7a, when encourage from x direction in source, field pattern shows that electromagnetic wave is bound in lens surface.Fig. 7 b has further reflected excitation orientation.

As shown in Figure 8 and Figure 9, when encourage from y, x direction respectively in source, field pattern and simulation result have shown the good goodness of fit.

As shown in figure 10, material object is 2.2 by dielectric constant polyfluortetraethylene plate and the U-shaped groove structure of metal form.

Lens Design in the utility model is at 10GHz.In other embodiments, different according to working frequency range, can adopt similar method to realize.By regulating the structural parameters of lens to realize the change of performance, wherein structural parameters comprise length and the width of U-shaped sheet metal unit, and the groove depth of U-shaped sheet metal.

In a word, the super surperficial lens that the U-shaped sheet metal that the utility model is arranged by periodicity ranks forms have anisotropic surface refractive index, and two main shaft components of tensor surface refractive index are designed separately: two main shafts are respectively depth direction and the Width along U-shaped metallic channel.Along the component of depth direction, take the physical centre of lens and be uniformly distributed as the center of circle to all sides, and there is the refraction index profile of fish-eye lens; The component of broad ways be take the physical centre of lens and is uniformly distributed as the center of circle to all sides, and has the refraction index profile of dragon uncle lens.Thereby when source is placed on lens along on the axis of metallic channel depth direction time, designed lens have the function of fish-eye lens; When source is placed on lens along on the axis of metallic channel Width time, designed lens have the function of dragon uncle lens.In microwave section, realize the independent regulation and control to the surface phasmon of the different directions of propagation.That lens antenna is made is simple, technical maturity, price are not high, be convenient to promote; Can be applicable to the different-wavebands such as microwave, millimeter wave and THz wave by the convergent-divergent of structural parameters, utilize the artificial super surface with anisotropy feature to realize the design of dual function surface wave device.

The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications and (improve or retouch length and the width that comprises U-shaped sheet metal unit; the groove depth of U-shaped sheet metal; the gradual change rules of groove depth etc.), these improvements and modifications also should be considered as protection range of the present utility model.

Claims

1. super surperficial lens of anisotropic flake-Long Bai, it is characterized in that, comprise dielectric substrate (1) and be arranged on surface metal structure (2) in dielectric substrate, that arrange and form by a plurality of construction units (3) periodicity ranks, described surface metal structure (2) is in a center of symmetry, and the groove depth of described construction unit is from symmetrical centre to periphery gradual change.

2. the super surperficial lens of anisotropic flake-Long Bai as claimed in claim 1, is characterized in that, described construction unit comprises U-shaped sheet metal.

3. the super surperficial lens of anisotropic flake-Long Bai as claimed in claim 2, is characterized in that, the groove depth of described U-shaped sheet metal reduces to periphery gradually from symmetrical centre.

4. the super surperficial lens of anisotropic flake-Long Bai as claimed in claim 1, is characterized in that, the groove depth of described construction unit reduces to periphery gradually from symmetrical centre.

5. the super surperficial lens of anisotropic flake-Long Bai as claimed in claim 3, is characterized in that, the groove depth of the U-shaped sheet metal equating apart from symmetrical centre equates.