Composite function metasurface capable of simultaneously regulating and controlling radiation and scattering characteristics

Abstract

The utility model provides a composite function metasurface capable of simultaneously regulating and controlling radiation and scattering characteristics, the composite function metasurface comprises a plurality of composite function metasurface units which are arranged in order, each composite function metasurface unit comprises a plurality of dielectric substrates, the surface of one side of each dielectric substrate is covered with a first metal patch, and the surface of the other side of each dielectric substrate is covered with a second metal patch. The surface of the other side of the dielectric substrate is covered with a second metal patch; a linear pattern is etched on the first metal patch; an H-shaped pattern is etched on the second metal patch; the size change of the upper surface structure does not affect the adjusting effect of the lower surface structure, namely function decoupling of the upper and lower layer structures is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to antenna technical field especially relates to a compound function metasurface of radiated scattering characteristic simultaneous regulation and control. BACKGROUND

[0002] The metasurface is a kind of artificial electromagnetic structure that is periodically or non-periodically arranged by subwavelength artificial unit in two-dimensional plane, and its thickness is far less than working wavelength, easy to prepare and integrate, and can flexibly manipulate amplitude, polarization, phase and other of electromagnetic wave.However, once the traditional metasurface structure is determined, it often has the characteristics of single function, such as only realizing the promotion of antenna gain or the expansion of working bandwidth;How to further expand the function and application of metasurface to make it have diversified functions simultaneously is a problem to be solved urgently. SUMMARY

[0003] The utility model discloses a kind of compound function metasurfaces of radiated scattering characteristic simultaneous regulation and control, to solve the technical problems of the prior art, realize the function decoupling of upper and lower layer structure.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] The utility model provides a kind of compound function metasurface of radiated scattering characteristic simultaneous regulation and control, compound function metasurface includes multiple ordered arrangement compound function metasurface unit, the compound function metasurface unit includes multiple dielectric substrate, the surface of each dielectric substrate side is covered with first metal patch, the surface of the other side of dielectric substrate is covered with second metal patch;

[0006] A character pattern is etched on the first metal patch;

[0007] H pattern is etched on the second metal patch.

[0008] Further, the width of the character pattern is 1mm.

[0009] Further, the height of the middle part of the H pattern is 6mm;The width of the middle part of the H pattern is 0.5mm.

[0010] Further, the width of the first metal patch can be adjusted;The length of the character pattern can be adjusted.

[0011] Further, the relative dielectric constant of the dielectric substrate is 2.2.

[0012] Further, the compound function metasurface is loaded with microstrip antenna.

[0013] Further, the working frequency band of the microstrip antenna is 5.6GHz.

[0014] Furthermore, the distance between the composite functional metasurface and the microstrip antenna is 28 mm.

[0015] The beneficial effects of this invention are as follows: A metal patch with an H-shaped slit is etched on the lower surface of the composite functional metasurface, achieving strong reflection and weak transmission of electromagnetic waves. This patch, together with the antenna ground plane, forms a Fabry-Perot resonant cavity, thereby modulating the radiation characteristics of the electromagnetic waves. A metal patch with a straight slit is etched on the upper surface of the composite functional metasurface. By adjusting the size of the patch and the slit dimensions, the reflection phase of the incident electromagnetic waves can be changed, thus forming a checkerboard structure to reduce the RCS of the antenna, thereby achieving the adjustment of the electromagnetic wave scattering characteristics. Furthermore, changes in the size of the upper surface structure do not affect the adjustment function of the lower surface structure, thus achieving functional decoupling between the upper and lower layers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a composite functional metasurface unit;

[0017] Figure 2 A schematic diagram showing the simulation model and boundary conditions for the composite functional metasurface unit;

[0018] Figure 3 This is a curve showing the amplitude of the reflectance coefficient of the first metal patch;

[0019] Figure 4 The phase curve of the reflection coefficient of the first metal patch;

[0020] Figure 5 This is a curve showing the amplitude of the reflection coefficient of the second metal patch;

[0021] Figure 6 The phase curve of the reflection coefficient of the second metal patch;

[0022] Figure 7 This is a schematic diagram showing the arrangement of the first and second metal patches;

[0023] Figure 8 This is a schematic diagram of a composite functional metasurface and microstrip antenna loading structure;

[0024] Figure 9 The reflection coefficient curve of the microstrip antenna port is shown.

[0025] Figure 10 This is a gain curve of the microstrip antenna port;

[0026] Figure 11 This is the three-dimensional radiation pattern of the microstrip antenna.

[0027] Figure 12 This is a monostatic RCS curve of a microstrip antenna. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model.

[0029] A composite functional super surface with simultaneously regulated radiation scattering characteristics, the composite functional super surface 3 comprises a plurality of ordered composite functional super surface units, the composite functional super surface unit comprises a plurality of dielectric substrates 1, the surface of one side of each dielectric substrate 1 is covered with a first metal patch 101, and the surface of the other side of the dielectric substrate 1 is covered with a second metal patch 102;

[0030] The first metal patch 101 is etched with a character-shaped pattern.

[0031] The second metal patch 102 is etched with an H-shaped pattern.

[0032] The width of the character-shaped pattern is 1mm.

[0033] The height of the middle part of the H-shaped pattern is 6mm, and the width of the middle part of the H-shaped pattern is 0.5mm.

[0034] The width of the first metal patch 101 can be adjusted, and the length of the character-shaped pattern can be adjusted.

[0035] The relative dielectric constant of the dielectric substrate 1 is 2.2.

[0036] The composite functional super surface 3 is loaded with a microstrip antenna 2.

[0037] The working frequency band of the microstrip antenna 2 is 5.6GHz.

[0038] The distance between the composite functional super surface 3 and the microstrip antenna 2 is 28mm.

[0039] Embodiment one:

[0040] As Figure 1As shown, the upper surface of the dielectric substrate 1 is etched with a first metal patch 101 of a linear slot, and the lower surface of the dielectric substrate 1 is etched with a second metal patch 102 of an H-shaped slot; wherein the width of the first metal patch is denoted as a, the length of the first metal patch is denoted as b, the length of the linear pattern is denoted as S1, the width of the linear pattern is denoted as W1, the width of the dielectric substrate 1 is denoted as P1, the thickness of the dielectric substrate 1 is denoted as t, the width of the second metal patch is denoted as P2, the height of the middle part of the H-shaped pattern is denoted as S3, the width of the middle part of the H-shaped pattern is denoted as W3, the length of the two end parts of the H-shaped pattern is denoted as S2, and the width of the two end parts of the H-shaped pattern is denoted as W2. Among them, the width a of the first metal patch and the length S1 of the linear pattern are variable parameters.

[0041] Table 1 Size parameters of each part of the composite functional metasurface (unit: mm)

[0042]

[0043] The upper surface of the composite functional metasurface can realize phase modulation of incident electromagnetic waves, thereby controlling the scattering field distribution thereof; the lower surface of the composite functional metasurface can realize strong reflection and weak transmission of incident electromagnetic waves, thereby forming an F-P resonant cavity with an antenna floor to adjust the radiation characteristics thereof, and the upper layer structure and the lower layer structure are functionally decoupled, and can independently adjust the scattering characteristics and the radiation characteristics of electromagnetic waves.

[0044] To further illustrate the characteristics of the composite functional metasurface, full-wave electromagnetic simulation is performed on the unit by using HFSS simulation software, and the simulation model is as shown in Figure 2 An air box as shown in the figure is established, and Floquet ports are arranged on the two surfaces parallel to the composite functional metasurface, and the remaining four surfaces are set as periodic boundaries.

[0045] To realize the adjustment of the scattering characteristics by the first metal patch 101 and the adjustment of the radiation characteristics by the second metal patch 102, the width a of the first metal patch and the length S1 of the linear pattern shown in Table 1 are changed to construct two different unit structures.

[0046] Among them, four composite functional metasurface units form a unit structure, and the arrangement mode of the four composite functional metasurface units is two composite functional metasurface units in each row and two composite functional metasurface units in each column.

[0047] Among them, the sizes of the first metal patches 101 of the four composite functional metasurface units in the first unit structure 501 are the same, and are all a = 11.4mm and S1 = 10mm.

[0048] The size of the first metal patch 101 of the four composite functional metasurface units in the second unit structure 502 is the same, all a = 13 mm, S1 = 8.3 mm;

[0049] That is, the size of the first metal patch of the first unit structure 501 is different from the size of the first metal patch of the second unit structure 502; the size of the second metal patch of the first unit structure 501 is the same as the size of the second metal patch of the second unit structure 502.

[0050] First, the electromagnetic properties of the first metal patch 101 are studied;

[0051] Among them, from Figure 3 and Figure 4 It can be seen that, whether under x-polarized wave incidence or y-polarized wave incidence, the first metal patch 101 of the first unit structure 501 and the second unit structure 502 has a high reflection amplitude, which is greater than 0.8 in the range of 5GHz-6GHz.

[0052] Further observation of the reflection phase condition can find that, whether under x-polarized wave incidence or y-polarized wave incidence, the reflection phase difference of the first unit structure 501 and the second unit structure 502 in the 5.6GHz frequency band range is about 180°, indicating that the first unit structure and the second unit structure can reduce the radar scattering cross section (RCS) of the target antenna through the chessboard structure layout.

[0053] As shown in Figure 5 , the reflection amplitude of the first unit structure 501 and the second unit structure 502 under x-polarized wave incidence is close to 1, which is approximately full reflection, so it cannot be used to construct an F-P resonant cavity; under y-polarized incident wave condition, the reflection amplitudes of the two units near 5.6GHz are very close, and are all above 0.85, indicating that the two units have strong reflection-weak transmission characteristics;

[0054] As shown in Figure 6 , it can be found that the reflection phases of the first unit structure 501 and the second unit structure 502 in the 5.6GHz frequency band are all near 180°, and the phase difference is less than 10°, indicating that the first unit structure 501 and the second unit structure 502 can be integrated in the same F-P resonant cavity. Comprehensive Figure 5 It can be found that the change of the structure parameters (i.e. a and S1) of the first metal patch 101 proposed has little effect on the electromagnetic response characteristics of the second metal patch 102, that is, the upper and lower layer functions can be decoupled, so as to achieve the composite function of regulating scattering in the upper layer and regulating radiation in the lower layer.

[0055] As shown in Figure 7As shown, the first unit structure 501 and the second unit structure 502 are staggered to form a composite functional super surface, when the composite functional super surface 3 is loaded on the antenna as a coating, the second metal patch surface of the composite functional super surface 3 and the antenna floor jointly constitute an F-P resonant cavity, which can improve the gain of the antenna; the first metal patch surface of the composite functional super surface 3 can realize phase cancellation of the incident wave through the chessboard layout, thereby reducing the RCS of the antenna.

[0056] As shown in the figure, Figure 8 The composite functional super surface is loaded on a microstrip antenna 2 operating at a frequency of 5.6GHz, the microstrip antenna 2 uses an FR4 dielectric substrate with a relative dielectric constant of 4.4, a thickness of 1.6mm, and a patch size of 16.3mmx11.7mm, and the distance between the composite functional super surface 3 and the microstrip antenna 2 is 28mm.

[0057] As shown in the figure, Figure 9 And Figure 10 As shown in the figure, the -10dB operating bandwidth of the antenna after loading the coating is expanded from 5.5GHz~5.8GHz to 5.35GHz~5.9GHz, at 5.6GHz, the gain in the normal direction of the antenna is increased from 2.2dB to 9.9dB, an increase of 7.7dB, and there is a significant improvement in the entire operating frequency band.

[0058] Figure 11 The three-dimensional radiation patterns of the antenna before and after loading the coating at 5.5GHz, 5.6GHz, 5.7GHz and 5.8GHz are shown, it can be seen that the radiation energy of the antenna after loading the coating has been significantly converged, thereby improving the gain in the normal direction, proving the effect of the designed super surface in improving the radiation characteristics of the antenna.

[0059] Figure 12 As shown in the figure, the single station RCS curve obtained when the electromagnetic wave is vertically incident on the antenna. As can be seen from the figure, whether the x polarized wave or the y polarized wave is incident, the RCS of the antenna after loading the coating is effectively reduced, among them, the y polarization is reduced by 21.7dB (5.4GHz), and the x plan is reduced by 6.6dB (5.7GHz); that is, the composite functional super surface can regulate the scattering characteristics of the target, and realize the RCS reduction of the target.

[0060] The above-described embodiments only express the implementation of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be based on the appended claims.

Claims

1. A composite functional metasurface with simultaneous regulation of radiation scattering properties, characterized in that: The composite functional super surface (3) comprises a plurality of composite functional super surface units arranged in order, wherein each composite functional super surface unit comprises a plurality of dielectric substrates (1), one side of each dielectric substrate (1) is covered with a first metal patch (101), and the other side of each dielectric substrate (1) is covered with a second metal patch (102); The first metal patch (101) is etched with a one-word pattern; The second metal patch (102) is etched with an H-shaped pattern.

2. The metasurface of claim 1, wherein: The width of the one-word pattern is 1 mm.

3. The composite functional metasurface of claim 2, wherein: The height of the middle part of the H-shaped pattern is 6 mm, and the width of the middle part of the H-shaped pattern is 0.5 mm.

4. The composite functional metasurface of claim 2, wherein: The width of the first metal patch (101) can be adjusted, and the length of the one-word pattern can be adjusted.

5. The composite functional metasurface of claim 1, wherein: The relative dielectric constant of the dielectric substrate (1) is 2.

2.

6. The composite functional metasurface of claim 1, wherein: The composite functional super surface (3) is loaded with a microstrip antenna (2).

7. The composite functional metasurface of claim 6, wherein: The working frequency band of the microstrip antenna (2) is 5.6 GHz.

8. The composite functional metasurface of claim 7, wherein: The distance between the composite functional super surface (3) and the microstrip antenna (2) is 28 mm.

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