A checkerboard metasurface structure and its application

Abstract

A checkerboard metasurface structure and its application relate to the field of radiation wave reflection devices. The checkerboard metasurface structure provided by this application, by staggering first and second metasurface units with a 180° reflection phase difference in a checkerboard pattern, can reduce RCS by 10dB in the 7.4-15.0GHz range and by 15dB in the 7.9-14.3GHz range. This structure has the advantages of wide bandwidth and good RCS reduction, 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 key means of achieving stealth. RCS is a key parameter that measures an object's ability to reflect radar waves. The smaller the RCS, the lower the probability of a 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 fall into two categories: geometric stealth and material stealth. Geometric stealth optimizes the shape of the target object to reduce its surface reflection of radar waves; 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 the reflected waves. However, these traditional technologies have some limitations: geometric stealth requires significant structural modifications to the target object, which often increases the complexity of design and manufacturing. At the same time, it is difficult to ensure stealth at multiple angles and across a wide frequency band. The absorbing materials used in material stealth are effective within a specific frequency range, but the absorption efficiency is low across a wide frequency band and is sensitive to environmental factors such as humidity and temperature.

[0004] To overcome the limitations of traditional stealth technology, metasurface technology has emerged. Metasurfaces are two-dimensional materials composed of artificial structural units at subwavelength scales, enabling precise control of the phase, amplitude, and polarization of electromagnetic waves. By designing different arrangements of metasurface units, electromagnetic waves can be arbitrarily manipulated, achieving broadband, multi-angle stealth. Summary of the Invention

[0005] The purpose of this 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 good bandwidth and RCS reduction effect.

[0006] This application is implemented as follows:

[0007] 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 first metasurface units and second metasurface units arranged alternately along the length and width directions of the dielectric layer, and the first metasurface units and the second metasurface units are respectively composed of multiple first units and second units arranged in a matrix; wherein the first unit is obtained by respectively arranging a first rectangle and a second rectangle in a square area with a side length a, and then symmetrically replicating along the diagonal, X-axis, and Y-axis; the second unit is obtained by respectively arranging a third rectangle and a fourth rectangle in a square area with a side length a, and then symmetrically replicating along the diagonal, X-axis, and 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;

[0008] The center coordinates of the first rectangle are (-0.99 to -1.01 mm, -1.39 to -1.41 mm), the length is 5.6 to 5.8 mm, the width is 0.5 to 0.7 mm, and the length direction forms an angle of 58.5 to 60.5 degrees with the positive X-axis; the center coordinates of the second rectangle are (3.59 to 3.61 mm, -0.59 to -0.61 mm), the length is 1.3 to 1.5 mm, the width is 0.09 to 0.11 mm, and the length direction forms an angle of 86.9 to 88.9 degrees with the negative X-axis;

[0009] 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 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 X-axis.

[0010] In some optional embodiments, the dielectric layer is made of FR4 material.

[0011] In some optional embodiments, the thickness of the dielectric layer is 2.9-3.1 mm.

[0012] In some optional embodiments, the thickness of the metal patch layer is 0.03-0.04 mm.

[0013] In some optional embodiments, the side length a of the square area is 9.9-10.1 mm.

[0014] 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.

[0015] This application also provides the application of the above-mentioned checkerboard metasurface structure in reducing RCS.

[0016] The beneficial effects of the present application are as follows: the checkerboard metasurface structure provided by the present application can reduce the RCS by 10 dB in the range of 7.4~15.0GHz and by 15 dB 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 has important theoretical and practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of 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;

[0019] Figure 2 This is a schematic diagram of the structure after 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, X-axis, and Y-axis;

[0020] Figure 3 A schematic structural diagram of 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;

[0021] Figure 4 This is a schematic diagram of the structure after 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, X-axis, and Y-axis;

[0022] 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;

[0023] Figure 6 A schematic diagram of the structure of a checkerboard metasurface structure provided in an embodiment of the present application;

[0024] Figure 7 Three-dimensional scattering diagram of the checkerboard metasurface structure provided in the embodiment of the present application at different frequencies;

[0025] Figure 8 A single-station RCS reduction curve of the checkerboard metasurface structure provided in an embodiment of the present application at normal incidence;

[0026] Figure 9 This is a single-station RCS reduction curve of the checkerboard metasurface structure provided in an embodiment of the present application under oblique incidence. DETAILED DESCRIPTION

[0027] 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.

[0028] 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 protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0029] The following is a further detailed description of the features and performance of the checkerboard metasurface structure of the present application and its applications in conjunction with the embodiments.

[0030] 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 dielectric layer has a thickness of 2.9-3.1 mm, optionally 3 mm; the metal patch layer is a metal conductor layer manufactured using PCB printing technology; optionally, the metal patch layer is a copper patch layer; optionally, the metal patch layer has a thickness of 0.03-0.04 mm, optionally 0.035 mm;

[0031] The metal patch layer has a checkerboard structure and is composed of first metasurface units and second metasurface units that are staggered along the length and width directions of the dielectric layer. The first metasurface units and the second metasurface units are respectively composed of a plurality of first units and second units arranged in a matrix. Optionally, the first metasurface units and the second metasurface units are respectively composed of first units and second units arranged in a 7×7 matrix.

[0032] Among them, such as Figure 1 and Figure 2As shown, the first unit is obtained by respectively setting a first rectangle and a second rectangle in a square area with a side length a, and then symmetrically replicating them along the diagonal, X-axis, and Y-axis. The center coordinates of the first rectangle are (-0.99 to -1.01 mm, -1.39 to -1.41 mm), the length is 5.6 to 5.8 mm, the width is 0.5 to 0.7 mm, and the length direction forms an angle of 58.5 to 60.5 degrees with the positive direction of the X-axis; the center coordinates of the second rectangle are (3.59 to 3.61 mm, -0.59 to -0.61 mm), the length is 1.3 to 1.5 mm, the width is 0.09 to 0.11 mm, and the length direction forms an angle of 86.9 to 88.9 degrees with the negative direction of the X-axis.

[0033] like Figure 3 and Figure 4 As shown, the second unit sets a third rectangle and a fourth rectangle in a square area with a side length of a, and then replicates them symmetrically 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 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.

[0034] 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.

[0035] The checkerboard metasurface structure provided in the embodiment of the present application is provided by setting a first metasurface unit and a second metasurface unit (such as Figure 5 As shown in the figure, AMC1 is the first metasurface unit and AMC2 is the second metasurface unit), and the first and second metasurface units are staggered in a checkerboard structure along the length and width of the dielectric layer. The first and second units of the first and second metasurface units can cooperate to effectively reduce the radar cross section, effectively improving the stealth effect, with the advantages of wide bandwidth and multi-angle, and has great application prospects. Experimental results show that the checkerboard metasurface structure provided in the embodiment of the present application can reduce the RCS by 10dB in the 7.4-15.0GHz range and by 15dB in the 7.9-14.3GHz range. This shows 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.

[0036] Example 1

[0037] 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 has a thickness of 3 mm, and the metal patch layer is a copper patch layer manufactured using PCB printing technology and has a thickness of 0.035 mm.

[0038] The metal patch layer is composed of first metasurface units and second metasurface units arranged alternately along the length and width directions of the dielectric layer. The first metasurface units and the second metasurface units are respectively composed of first units and second units arranged in a 7×7 matrix.

[0039] The first unit is obtained by placing a first rectangle and a second rectangle in a square area with a side length of 10 mm, and then symmetrically replicating them along the diagonal, X-axis, and Y-axis; the second unit is obtained by placing a third rectangle and a fourth rectangle in a square area with a side length of 10 mm, and then symmetrically replicating them along the diagonal, X-axis, and Y-axis; the coordinate system is established with the center of the square area as the origin, and the X-axis and Y-axis are established in the horizontal direction and the vertical direction respectively;

[0040] 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 at an angle of 59.5 degrees to the positive 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 at an angle of 87.9 degrees to the negative X-axis;

[0041] 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 at a 16-degree angle to the positive 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 at a 90-degree angle to the positive X-axis.

[0042] The three-dimensional scattering simulation test and RCS simulation test of the checkerboard metasurface structure provided in this embodiment are as follows: Figure 7 、 Figure 8 and Figure 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 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.

[0043] 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 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 making creative efforts are within the scope of protection of this 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 metasurface unit and a second metasurface unit staggered along the length and width directions of the dielectric layer, 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 respectively setting a first rectangle and a 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 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 the diagonal, X-axis and Y-axis; 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 at an angle of 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 at an angle of 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, wherein: 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 metasurface unit and the second metasurface 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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