Checkerboard metasurface structure and application thereof

Abstract

The invention discloses a checkerboard metasurface structure and application thereof, and relates to the field of radiation wave reflection devices. According to the checkerboard metasurface structure, the first metasurface units and the second metasurface units with the 180-degree reflection phase difference are arranged in a staggered mode according to the checkerboard structure, the RCS can be reduced by 10 dB within the range of 7.4-15.0 GHz, the RCS can be reduced by 15 dB within the range of 7.9-14.3 GHz, and the checkerboard metasurface structure has the advantages of being wide in frequency band and good in RCS reduction effect and has important theoretical and practical application value.

Description

Technical Field

[0001] The present application relates to the field of radiation wave reflection devices, and in particular, to a checkerboard metasurface structure and its application. Background Art

[0002] With the rapid development of radar technology, reducing radar cross section (RCS) is one of the important means to achieve stealth. RCS is a key parameter to measure the ability of an object to reflect radar waves. The smaller the RCS, the lower the probability of the target being detected by radar. Therefore, RCS reduction technology has important application value in stealth design in various applications.

[0003] Traditional RCS reduction technologies mainly include geometric stealth and material stealth. Geometric stealth optimizes the shape of the target object to reduce the reflection of radar waves on its surface; material stealth uses absorbing materials to absorb the energy of incident radar waves and convert them into heat or other forms of energy to reduce the intensity of reflected waves. However, these traditional technologies have some limitations: geometric stealth requires significant structural modifications to the target object, which usually increases the complexity of design and manufacturing, and it is difficult to guarantee stealth effects at multiple angles and in a wide frequency band. The absorbing materials of material stealth work better within a specific frequency range, but the absorption efficiency is not high within a wide frequency band, and they are sensitive to environmental factors such as humidity and temperature.

[0004] In order to overcome the limitations of traditional stealth technology, metasurface technology came into being. Metasurface is a two-dimensional material composed of artificial structural units of sub-wavelength size, which can achieve precise control of the phase, amplitude and polarization state of electromagnetic waves on the surface. By designing different arrangements of metasurface units, electromagnetic waves can be arbitrarily controlled to achieve the purpose of broadband and multi-angle stealth. Summary of the invention

[0005] The purpose of the present application is to provide a checkerboard metasurface structure and its application, which can effectively reduce RCS in the range of 7.4~15.0GHz, and has the advantages of wide bandwidth and good RCS reduction effect.

[0006] This application is implemented as follows: The present application provides a checkerboard metasurface structure, which is composed of a dielectric layer and a metal patch layer, wherein the metal patch layer is composed of a first metasurface unit and a second metasurface unit arranged alternately along the length direction and the width direction of the dielectric layer, and the first metasurface unit and the second metasurface unit are respectively composed of a plurality of first units and a second unit arranged in a matrix; wherein the first unit is obtained by arranging a first rectangle and a second rectangle in a square area with a side length of a, and then symmetrically replicating along a diagonal, an X-axis and a Y-axis; the second unit is obtained by arranging a third rectangle and a fourth rectangle in a square area with a side length of a, and then symmetrically replicating along a diagonal, an X-axis and a Y-axis; and the X-axis and the Y-axis are established in the horizontal direction and the vertical direction respectively with the center of the square area as the origin; The center coordinates of the first rectangle are (-0.99~-1.01mm, -1.39~-1.41mm), the length is 5.6~5.8mm, the width is 0.5~0.7mm, and the length direction is 58.5~60.5 degrees to the positive direction of the X-axis; the center coordinates of the second rectangle are (3.59~3.61mm, -0.59~-0.61mm), the length is 1.3~1.5mm, the width is 0.09~0.11mm, and the length direction is 86.9~88.9 degrees to the negative direction of the X-axis; The center coordinates of the third rectangle are (-2.69~-2.71mm, -1.59~-1.61mm), the length is 0.6~0.8mm, the width is 0.09~0.11mm, and the length direction is 15~17 degrees to the positive direction of the X-axis; the center coordinates of the fourth rectangle are (2.79~2.81mm, -3.49~-3.51mm), the length is 1.5~1.7mm, the width is 0.09~0.11mm, and the length direction is 89~91 degrees to the positive direction of the X-axis.

[0007] In some optional embodiments, the dielectric layer is made of FR4 material.

[0008] In some optional embodiments, the thickness of the dielectric layer is 2.9-3.1 mm.

[0009] In some optional embodiments, the thickness of the metal patch layer is 0.03-0.04 mm.

[0010] In some optional embodiments, the side length a of the square area is 9.9-10.1 mm.

[0011] In some optional embodiments, the first metasurface unit and the second metasurface unit are respectively composed of first units and second units arranged in a 7×7 matrix.

[0012] The present application also provides the application of the above-mentioned checkerboard metasurface structure in reducing RCS.

[0013] The beneficial effects of the present application are as follows: the checkerboard metasurface structure provided by the present application can reduce the RCS by 10dB in the range of 7.4~15.0GHz and by 15dB in the range of 7.9~14.3GHz by staggering the first metasurface unit and the second metasurface unit with a reflection phase difference of 180° in a checkerboard structure, thereby having the advantages of good bandwidth and RCS reduction effect, and having important theoretical and practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic structural diagram of a first rectangle and a second rectangle in a square area of ​​a first unit in a checkerboard metasurface structure provided in an embodiment of the present application; Figure 2 A schematic diagram of a structure in which the first rectangle and the second rectangle in the square area of ​​the first unit in the checkerboard metasurface structure provided in an embodiment of the present application are symmetrically replicated along the diagonal, the X-axis and the Y-axis; Figure 3 A schematic structural diagram of a third rectangle and a fourth rectangle in a square area of ​​a second unit in a checkerboard metasurface structure provided in an embodiment of the present application; Figure 4 A schematic diagram of a structure in which the third rectangle and the fourth rectangle in the square area of ​​the second unit in the checkerboard metasurface structure provided in an embodiment of the present application are symmetrically replicated along the diagonal, the X-axis and the Y-axis; Figure 5 A reflection phase curve diagram of the first metasurface unit and the second metasurface unit in the checkerboard metasurface structure provided in an embodiment of the present application; Figure 6 A schematic diagram of the structure of a checkerboard metasurface structure provided in an embodiment of the present application; Figure 7 A three-dimensional scattering diagram of the checkerboard metasurface structure provided in an embodiment of the present application at different frequencies; Figure 8 A single-station RCS reduction curve diagram of the checkerboard metasurface structure provided in an embodiment of the present application under normal incidence; Fig. 9 A single-station RCS reduction curve diagram of the checkerboard metasurface structure under oblique incidence provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0017] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0018] The features and performance of the checkerboard metasurface structure of the present application and its application are further described in detail below in conjunction with the embodiments.

[0019] The embodiment of the present application provides a checkerboard metasurface structure, which is composed of a dielectric layer and a metal patch layer arranged in sequence, the dielectric layer is made of FR4 material; optionally, the thickness of the dielectric layer is 2.9~3.1mm, optionally 3mm; the metal patch layer is a metal conductor layer manufactured by PCB printing technology; optionally, the metal patch layer is a copper patch layer; optionally, the thickness of the metal patch layer is 0.03~0.04mm, optionally 0.035mm; The metal patch layer is a checkerboard structure composed of a first super surface unit and a second super surface unit staggered along the length direction and the width direction of the dielectric layer, and the first super surface unit and the second super surface unit are respectively composed of a plurality of first units and second units arranged in a matrix; optionally, the first super surface unit and the second super surface unit are respectively composed of a first unit and a second unit arranged in a 7×7 matrix; Among them, Figure 1 and Figure 2 As shown, the first unit is obtained by respectively setting the first rectangle and the second rectangle in a square area with a side length of a, and then symmetrically replicating along the diagonal, X-axis and Y-axis. The center coordinates of the first rectangle are (-0.99~-1.01mm, -1.39~-1.41mm), the length is 5.6~5.8mm, the width is 0.5~0.7mm, and the length direction is 58.5~60.5 degrees with the positive direction of the X-axis; the center coordinates of the second rectangle are (3.59~3.61mm, -0.59~-0.61mm), the length is 1.3~1.5mm, the width is 0.09~0.11mm, and the length direction is 86.9~88.9 degrees with the negative direction of the X-axis; like Figure 3 and Figure 4As shown, the second unit is obtained by respectively setting a third rectangle and a fourth rectangle in a square area with a side length of a and then symmetrically replicating them along the diagonal, X-axis and Y-axis. The center coordinates of the third rectangle are (-2.69~-2.71mm, -1.59~-1.61mm), the length is 0.6~0.8mm, the width is 0.09~0.11mm, and the length direction is 15~17 degrees with the positive direction of the X-axis; the center coordinates of the fourth rectangle are (2.79~2.81mm, -3.49~-3.51mm), the length is 1.5~1.7mm, the width is 0.09~0.11mm, and the length direction is 89~91 degrees with the positive direction of the X-axis; The above coordinate system takes the center of the square area as the origin and establishes the X-axis and Y-axis along the horizontal direction and the vertical direction respectively; optionally, the side length a of the square area is 9.9~10.1mm, and can be optionally 10mm.

[0020] The checkerboard metasurface structure provided in the embodiment of the present application is provided with a first metasurface unit and a second metasurface unit (such as Figure 5 As shown, AMC1 is the first metasurface unit, and AMC2 is the second metasurface unit), and the first metasurface unit and the second metasurface unit are arranged in a checkerboard structure in an interlaced manner along the length and width directions of the dielectric layer, and the first unit and the second unit of the first metasurface unit and the second metasurface unit can be used to cooperate to effectively reduce the radar cross section, effectively improve the stealth effect, have the advantages of wide band and multi-angle, and have great application prospects. The experimental results show that the checkerboard metasurface structure provided in the embodiment of the present application can reduce the RCS by 10dB in the range of 7.4~15.0GHz, and can reduce the RCS by 15dB in the range of 7.9~14.3GHz, indicating that the checkerboard metasurface structure provided in the embodiment of the present application is effective and reliable in reducing the radar cross section, and has important theoretical and practical application value.

[0021] Example 1 like Figure 6 As shown, the embodiment of the present application provides a checkerboard metasurface structure, which is composed of a dielectric layer and a metal patch layer made of FR4 material arranged in sequence, the dielectric layer is 3 mm thick, and the metal patch layer is a copper patch layer manufactured by PCB printing technology and has a thickness of 0.035 mm; The metal patch layer is composed of a first super surface unit and a second super surface unit which are staggered along the length direction and the width direction of the dielectric layer, and the first super surface unit and the second super surface unit are respectively composed of a first unit and a second unit arranged in a 7×7 matrix; The first unit is obtained by respectively setting the first rectangle and the second rectangle in a square area with a side length of 10 mm and then symmetrically replicating along the diagonal, X-axis and Y-axis; the second unit is obtained by respectively setting the third rectangle and the fourth rectangle in a square area with a side length of 10 mm and then symmetrically replicating along the diagonal, X-axis and Y-axis; the coordinate system takes the center of the square area as the origin and establishes the X-axis and the Y-axis in the horizontal direction and the vertical direction respectively; The center coordinates of the first rectangle are (-1mm, -1.4mm), the length is 5.7mm, the width is 0.6mm, and the length direction is 59.5 degrees to the positive direction of the X-axis; the center coordinates of the second rectangle are (3.6mm, -0.6mm), the length is 1.4mm, the width is 0.1mm, and the length direction is 87.9 degrees to the negative direction of the X-axis; The center coordinates of the third rectangle are (-2.7mm, -1.6mm), the length is 0.7mm, the width is 0.1mm, and the length direction is 16 degrees to the positive direction of the X-axis; the center coordinates of the fourth rectangle are (2.8mm, -3.5mm), the length is 1.6mm, the width is 0.1mm, and the length direction is 90 degrees to the positive direction of the X-axis.

[0022] The checkerboard metasurface structure provided in this embodiment is subjected to a three-dimensional scattering simulation test and an RCS simulation test. The results are as follows: Figure 7 , Figure 8 and Fig. 9 As shown, the experimental results show that the checkerboard metasurface structure provided in this embodiment can reduce the RCS by 10dB in the range of 7.4~15.0GHz, and reduce the RCS by 15dB in the range of 7.9~14.3GHz, indicating that the checkerboard metasurface structure provided in this embodiment is effective and reliable in reducing the radar scattering cross section, and has important theoretical and practical application value.

[0023] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A checkerboard metasurface structure, characterized in that: It consists of a dielectric layer and a metal patch layer, the metal patch layer consists of a first super surface unit and a second super surface unit arranged alternately along the length direction and the width direction of the dielectric layer, the first super surface unit and the second super surface unit are respectively composed of a plurality of first units and a second unit arranged in a matrix; wherein the first unit is obtained by respectively setting a first rectangle and a second rectangle in a square area with a side length of a and then symmetrically replicating along a diagonal, an X axis and a Y axis; the second unit is respectively set a third rectangle and a fourth rectangle in a square area with a side length of a and then symmetrically replicating along a diagonal, an X axis and a Y axis; the X axis and the Y axis are respectively established along the horizontal direction and the vertical direction with the center of the square area as the origin; The center coordinates of the first rectangle are (-0.99~-1.01mm, -1.39~-1.41mm), the length is 5.6~5.8mm, the width is 0.5~0.7mm, and the length direction is 58.5~60.5 degrees to the positive direction of the X-axis; the center coordinates of the second rectangle are (3.59~3.61mm, -0.59~-0.61mm), the length is 1.3~1.5mm, the width is 0.09~0.11mm, and the length direction is 86.9~88.9 degrees to the negative direction of the X-axis; The center coordinates of the third rectangle are (-2.69~-2.71mm, -1.59~-1.61mm), the length is 0.6~0.8mm, the width is 0.09~0.11mm, and the length direction is at an angle of 15~17 degrees to the positive direction of the X-axis; the center coordinates of the fourth rectangle are (2.79~2.81mm, -3.49~-3.51mm), the length is 1.5~1.7mm, the width is 0.09~0.11mm, and the length direction is at an angle of 89~91 degrees to the positive direction of the X-axis.

2. The checkerboard metasurface structure according to claim 1, characterized in that: The dielectric layer is made of FR4 material.

3. The checkerboard metasurface structure according to claim 1, characterized in that: The thickness of the dielectric layer is 2.9-3.1 mm.

4. The checkerboard metasurface structure according to claim 1, characterized in that: The thickness of the metal patch layer is 0.03-0.04 mm.

5. The checkerboard metasurface structure according to claim 1, characterized in that: The side length a of the square area is 9.9-10.1 mm.

6. The checkerboard metasurface structure according to claim 1, characterized in that: The first supersurface unit and the second supersurface unit are respectively composed of the first units and the second units arranged in a 7×7 matrix.

7. Application of the checkerboard metasurface structure according to any one of claims 1-6 in reducing RCS.

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