CN104103907A - Novel artificial electromagnetic surface capable of adjusting and controlling surface wave and propagation wave simultaneously and manufacturing method thereof - Google Patents

Abstract

The invention discloses a novel artificial electromagnetic surface capable of adjusting and controlling a surface wave and a propagation wave simultaneously, and a manufacturing method thereof. The novel artificial electromagnetic surface capable of adjusting and controlling the surface wave and the propagation wave simultaneously comprises a medium substrate, a metal layer and a surface structure arranged according to a certain sequence, wherein the surface structure has two adjacent round regions which are made of quadrate patches in different sizes; within one round region, the quadrate patches compose a surface wave Luneberg lens; in the other round region, the quadrate patches compose an artificial surface based on holographic optics. As the surface wave Luneberg lens is utilized for controlling the surface wave, and a holographic surface is utilized for adjusting and controlling a radiation wave in the invention, conversion between the surface wave and a radiation wave is realized. Meanwhile, the purpose of controlling the surface wave and the radiation wave simultaneously is realized through combination of the surface wave Luneberg lens and the holographic surface. The novel artificial electromagnetic surface can serve as a terminal of a surface wave information processing system to receive and radiate an information-carrying electromagnetic wave, and can be applied to different frequency bands through size magnification.

Description

Regulate and control novel artificial resistance electromagnetic surface and the manufacture method of surface wave and propagating wave simultaneously

Technical field

The present invention relates to artificial electromagnetic material, especially a kind of novel artificial resistance electromagnetic surface that can simultaneously regulate and control surface wave and propagating wave, can be for microwave, the wave bands such as millimeter wave and Terahertz.

Background technology

Novel artificial resistance electromagnetic surface provides abundant means for people regulate and control electromagnetic wave, but people are when utilizing novel artificial resistance electromagnetic surface regulation and control electromagnetic wave, conventionally regulation and control surface wave is separated and carried out with regulation and control radiated wave, for a system with Information Communication and information processing, the information that our common processing list ground roll carries, and utilize propagating wave to propagate these information, so just require the conversion equipment of a kind of suitable surface wave and propagating wave.

Summary of the invention

Goal of the invention: provide a kind of artificial electromagnetic surface that can simultaneously regulate and control surface wave and propagating wave, to solve the problems referred to above of prior art.

Technical scheme: a kind of novel artificial resistance electromagnetic surface that simultaneously regulates and controls surface wave and propagating wave, comprises the medium substrate, metal level and the surface texture that arrange according to a definite sequence; Described surface texture forms two adjacent border circular areas by the different square patch of size; At a border circular areas, square patch forms surface wave dragon uncle lens, at another border circular areas, and the artificial surface of square patch composition one based on holographic optics.

At surface wave dragon uncle lens area, its surface refractive index n _sdistribute as follows:

$n_s=\sqrt{2-{(r/R_L)}^2}$

R wherein _lfor dragon uncle's lens radius, r is the distance of certain point and lens centre in lens.

The manufacture method that regulates and controls the novel artificial resistance electromagnetic surface of surface wave and propagating wave in the time of described, comprises the steps:

Step 1: set up the cellular construction size of novel artificial resistance electromagnetic surface and the relation of surface refractive index and surface impedance;

Step 2: according to the cellular construction of the different size arranged evenly of surface refractive index and surface impedance.

Beneficial effect: the present invention utilizes surperficial imperial ripple lens control table ground roll, utilizes holographic surface regulation and control radiated wave, has realized the conversion of surface wave and radiated wave., both are combined meanwhile, realized the object of while control table ground roll and radiated wave.The present invention can be used as the terminal of surface wave information processing system, is used for receiving and the electromagnetic wave of radiation carry information, and can makes it be applied in different frequency range by scaled size.

Accompanying drawing explanation

Fig. 1 is structure principle chart of the present invention.

Fig. 2 is the enlarged diagram at A place in Fig. 1.

Fig. 3 is the enlarged diagram at B place in Fig. 1.

Fig. 4 is placed in excitation point source in the schematic diagram of two circular portion contact points.

Fig. 5 is the schematic diagram with loudspeaker excitation novel artificial resistance electromagnetic surface.

Fig. 6 is the surface refractive index of cellular construction.

Fig. 7 is the surface refractive index of cellular construction and the relation of surface impedance and cellular construction size.

Fig. 8 is that patch size of the present invention distributes.

Fig. 9 is structural representation of the present invention.

Figure 10 is emulation and test result when excitation point source is placed in to two circular portion contact points.

Figure 10 (a) is the xoy face E of emulation _zdistribute.

Figure 10 (b) is the E on the yoz face of emulation _xdistribute.

Figure 10 (c) is the E on the xoz face of emulation _xdistribute.

Figure 10 (d) is the xoy face E of test _zdistribute.

Figure 10 (e) is the E on the yoz face of testing _xdistribute.

Figure 10 (f) is the E on the xoz face of testing _xdistribute.

Figure 11 is emulation and the test result while encouraging novel artificial resistance electromagnetic surface with loudspeaker.

Figure 11 (a) is the xoy face E of emulation _zdistribute.

Figure 11 (b) is the xoy face E of test _zdistribute.

Figure 11 (c) is the E on the xoz face of emulation _ydistribute.

Figure 11 (d) is the xoz face E of emulation _xdistribute.

Embodiment

As shown in Figure 1, the present invention comprises two circular portions, and wherein roundlet is surface dragon uncle lens, and large circular portion is microwave holography surface.For little circular portion, we obtain its surface refractive index n based on geometric optics _sdistribute:

$n_s=\sqrt{2-{(r/R_L)}^2}---\left(1\right)$

R wherein _lfor dragon uncle's lens radius, r is the distance of certain point and lens centre in lens.

For large circular portion, we obtain the distribution of its surface impedance based on microwave holography technology.Reference wave can be the surface wave being produced by active antenna, and the radiation field that object wave needs corresponding to us, reference table ground roll and object wave are interfered generation microwave holography interference pattern mutually, this interference pattern is comprised of many scattering objects conventionally, and reference wave and these scattering objects interact and can produce the radiation field that we need.Film in holography records interference pattern with exposure intensity, and we record microwave hologram by the size of surface impedance here.The interaction of reference table ground roll and microwave hologram meets impedance boundary condition:

${\stackrel{\→}{W}}_S=Z_S\hat{z}\×{\stackrel{\→}{H}}_S=Z_S{\stackrel{\→}{J}}_S---\left(2\right)$

Wherein for surface current, Z _sfor surface impedance, with be respectively transverse electric field and transverse magnetic field.If we excite reference table ground roll with a monopole antenna that is positioned at initial point, the surface current so thereupon producing can be write as following form of cylindrical waves:

Wherein n is a constant, the Equivalent Surface refractive index of the whole microwave holography interference pattern that representative " is seen " by surface current institute.Suppose that needed target emanation ripple is we regulate and control surface impedance Z _smake it to meet following distribution:

The surface impedance of this modulation distributes and has formed microwave holography interference pattern, the mean value that wherein X is surface impedance (value of n is conventionally relevant with this mean value), and M is modulation index.According to impedance boundary condition, can obtain:

Wherein first and the 3rd is surface wave, and second is proportional to the target emanation ripple that we need.Thus, we record microwave holography interference pattern by modulation surface impedance, then with reference wave and interference pattern, interact, and then have rebuild the target emanation ripple that we need.

Obtain after the theoretical distribution of surface refractive index and surface impedance, can utilize novel artificial resistance electromagnetic surface to carry out these distributions of specific implementation.; the cellular construction size of model novel artificial resistance electromagnetic surface and the relation of surface refractive index and surface impedance; then according to the distribution of surface refractive index and surface impedance, arrange the cellular construction of different size, form the functional form novel artificial resistance electromagnetic surface of our design.

As shown in Fig. 1 and Fig. 9, the present invention comprises two circular surface structure divisions, and in figure, the less circular portion in the left side is surperficial imperial ripple lens, and the larger circular portion in the right is holographic surface, and each part is to consist of a large amount of different big or small square patchs.Effects on surface lens distribute (being little circular portion), different surface refractive index corresponding to patch size, and the refraction index profile of satisfied dragon uncle lens; To hologram sheet face portion, the surface impedance that different patch size is corresponding different, and the surface impedance that meets our designed holography surface distributes.

Fig. 2 and Fig. 3 are functional schematics of the present invention, for function of the present invention is described, by two kinds of motivational techniques:

As shown in Figure 4, a probe is placed in the contact point of two circular portions, now on the surface on left side dragon ripple lens, will encourage device surface wave, and surface wave is gone out by surface imperial ripple lens directed radiation subsequently; And on the holography surface on the right, will encourage leaky wave radiation, these radiated waves will pool a bit above holographic surface.

As shown in Figure 5, a horn antenna polarizing is in the x-direction positioned over the convergent point on holographic surface as driving source, now first loudspeaker have encouraged leaky wave on holographic surface, this leaky wave is converged to the contact point of two circular configurations, is directed surface wave of relaying subsequently by surface dragon uncle Lens Coupling.

Because being realizes conversion equipment by novel artificial resistance electromagnetic surface, first research forms the characteristic of the cellular construction of novel artificial resistance electromagnetic surface.

Cellular construction by top layer square patch, intermediate medium plate and underlying metal form, the surface wave of this structural support TM pattern.Solid line in Fig. 6 is the dispersion curve of the cellular construction that obtains of our emulation under different size, for TM pattern list ground roll, can obtain surface refractive index and surface impedance is as follows:

n _s＝k _s/k ₀ (6)

$Z_s=j\sqrt{{\mathrm{\μ}}_0/{\mathrm{\ϵ}}_0}\sqrt{{(k_s/k_0)}^2-1}---\left(7\right)$

We select 15GHz as operating frequency, utilize dispersion curve and formula (6) and formula (7) under the different patch size that emulation obtains, can obtain the corresponding relation of surface impedance and surface refractive index and the cellular construction size of cellular construction.

Fig. 7 has provided the curve chart of this relation, and wherein asterism solid line represents surface impedance, and round dot solid line represents surface refractive index.Obtained, after the size of cellular construction and the corresponding relation of surface impedance and surface refractive index, can designing concrete conversion equipment according to the method for designing of introducing above.

In design, the radius of surface dragon uncle lens is taken as 45mm.The radius of hologram sheet face portion is 75mm, interference pattern forms by being positioned at the point source of initial point (contact point of great circle and roundlet) and being positioned at the interference of point source of 280mm directly over holographic surface, according to formula (1) and formula (4), just can obtain the concrete distribution of surface refractive index of the present invention and surface impedance, then according to the corresponding relation of the size of cellular construction in Fig. 5 and surface impedance and surface refractive index, just can obtain the distribution map (as shown in Figure 8) of patch size in novel artificial resistance electromagnetic surface, thereby obtain the practical structures (as shown in Figure 9) of novel artificial resistance electromagnetic surface.

Figure 10 a to Figure 10 f has shown emulation and test result when excitation point source is placed in to two circular portion contact points.Figure 10 a is the xoy face E of emulation _zdistribute; Figure 10 d is the xoy face E of test _zdistribute.We can see that the surface wave dragon uncle lens on the left side have realized the function that the energy directional of point source is propagated.Figure 10 b and Figure 10 e are respectively the E on the yoz face of emulation and test _xdistribute; Figure 10 c and 10f are respectively the E on the xoz face of emulation and test _xdistribute.We can see that the hologram sheet face portion on the right has realized the energy centralization of surperficial point source in the function of holographic surface.

Figure 11 a to Figure 11 d is emulation and the test result while encouraging novel artificial resistance electromagnetic surface with loudspeaker.Figure 11 a and 11b are respectively the xoy face E of emulation and test _zdistribute; First the energy that can see loudspeaker is converged at the contact portion of two circular portions by holographic surface, then by the surface dragon uncle lens component directed radiation on the left side, gone out.Figure 11 c is the E on the xoz face of emulation _ydistribute; Figure 11 d is the xoz face E of emulation _xdistribute; From figure, can see clearly the surface wave that metasurface surface is excited.

The present invention possesses several lower several features: there is directional couple, and can be by the surface wave that converts to of space radiation ripple orientation; Shape to radiated wave does not require, and can be applied to different radiated wave shapes; Conversion equipment is easy to Design and implementation, has extraordinary using value.

In a word, the present invention is based on the surface wave of novel artificial resistance electromagnetic surface and the conversion equipment of radiated wave, by the regulation and control of the regulation and control of surface wave and radiated wave are combined, regulation and control when realizing surface wave and radiated wave.The present invention is as a kind of embodiment, and specific purposes are about to orientation surface ripple and convert the radiated wave converging in space to, otherwise, convert the radiated wave of space Point Source to orientation surface ripple.

More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned execution mode, within the scope of technical conceive of the present invention; can carry out multiple equivalents to technical scheme of the present invention, these equivalents all belong to protection scope of the present invention.

It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.

In addition, between various execution mode of the present invention, also can carry out combination in any, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (3)

1. a novel artificial resistance electromagnetic surface that simultaneously regulates and controls surface wave and propagating wave, is characterized in that, comprises the medium substrate, metal level and the surface texture that according to a definite sequence, arrange; Described surface texture forms two adjacent border circular areas by the different square patch of size; At a border circular areas, square patch forms surface wave dragon uncle lens, at another border circular areas, and the artificial surface of square patch composition one based on holographic optics.

2. the novel artificial resistance electromagnetic surface that simultaneously regulates and controls surface wave and propagating wave as claimed in claim 1, is characterized in that, at surface wave dragon uncle lens area, its surface refractive index n _sdistribute as follows:

$n_s=\sqrt{2-{(r/R_L)}^2}$

R wherein _lfor dragon uncle's lens radius, r is the distance of certain point and lens centre in lens.

3. the manufacture method that regulates and controls the novel artificial resistance electromagnetic surface of surface wave and propagating wave in the time of described in claim 1 or 2, is characterized in that, comprises the steps:

Step 1: set up the cellular construction size of novel artificial resistance electromagnetic surface and the relation of surface refractive index and surface impedance;

Step 2: according to the cellular construction of the different size arranged evenly of surface refractive index and surface impedance.