Broadband wave-absorbing metamaterial with cone-cap-like structure and application of broadband wave-absorbing metamaterial

Abstract

The invention discloses a broadband wave-absorbing metamaterial of a cone-cap-like structure and application of the broadband wave-absorbing metamaterial, and belongs to the technical field of electromagnetic metamaterials. The broadband wave-absorbing metamaterial with the cone-cap-like structure comprises a rectangular shell, a hollow cylindrical table and a cone, an open groove is formed in one surface of the rectangular shell; the hollow cylindrical table is arranged in the open groove, and the outer side wall of the hollow cylindrical table is externally tangent to the inner side wall of the rectangular shell; the cone is arranged in the hollow cylindrical table, and the bottom face of the cone is connected with the bottom face of the hollow cylindrical table. The broadband wave-absorbing metamaterial structure adopting the cone-cap-like design shows excellent broadband wave-absorbing capacity in a microwave frequency band, wave-absorbing characteristics can be accurately controlled by adjusting key parameters, different application requirements are met, the broadband wave-absorbing metamaterial has excellent anti-polarization interference capacity and stability of wave-absorbing performance, and the broadband wave-absorbing metamaterial is suitable for being used in the microwave field. The method has the production advantages of rapidness, low cost and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic metamaterials, and in particular to a broadband wave-absorbing metamaterial with a cone-cap-like structure and applications thereof. Background Art

[0002] With the rapid development of science and technology, the number of technologies and products using electromagnetic waves as a medium is increasing, and the impact of electromagnetic radiation on the environment is also increasing. For example, radio waves can disrupt airport environments, preventing flights from taking off normally; mobile phones can interfere with the operation of various precision electronic medical devices; and even ordinary computers radiate electromagnetic waves carrying information, which can be received and reproduced thousands of kilometers away, leading to intelligence leaks. Therefore, controlling electromagnetic pollution and finding materials that can withstand and weaken electromagnetic radiation—absorbent materials—has become a major topic in materials science.

[0003] Traditional absorbing materials often exhibit deficiencies such as insufficient absorption performance and heavy structures when faced with complex operating conditions such as low frequencies, wide bandwidths, and multi-angle incidence, making them difficult to meet current technological demands. Most existing absorbing materials leverage the inherent electromagnetic wave absorption properties of each material, designing the composition of different materials to achieve absorbing properties in the resulting composite. However, these materials are complex to design and are not suitable for large-scale application. They also lack the ability to select the frequency of the electromagnetic waves they attenuate, and their absorption bandwidth is relatively narrow, making them difficult to meet current technological demands.

[0004] How to prepare a broadband absorbing metamaterial with excellent performance to meet the needs of modern communications and other electromagnetic related systems, and solve the problems of traditional absorbing materials with narrow frequency band, poor low-frequency electromagnetic wave absorption effect, and insufficient stability of absorbing performance, is one of the key issues that need to be urgently solved in the field of electromagnetic metamaterial technology. Summary of the Invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a broadband absorbing metamaterial with a cone-shaped cap structure and its application to solve the problems of traditional absorbing materials such as narrow frequency band, poor low-frequency electromagnetic wave absorption effect, and insufficient stability of absorbing performance.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The first object of the present invention is to provide a broadband wave-absorbing metamaterial with a cone-like structure, comprising a rectangular shell, a hollow cylindrical platform and a cone;

[0008] An opening groove is provided on one side of the rectangular shell;

[0009] The hollow cylindrical platform is arranged inside the opening groove, and the outer wall of the hollow cylindrical platform is circumscribed with the inner wall of the rectangular shell;

[0010] The cone is arranged inside the hollow cylindrical platform, and the bottom surface of the cone is connected to the bottom surface of the hollow cylindrical platform.

[0011] The present invention provides a broadband absorbing metamaterial structure with a conical hat-like design, demonstrating exceptional broadband absorption capabilities in the microwave frequency band. By flexibly adjusting key characteristic parameters, the structure's absorption characteristics can be precisely controlled to meet diverse application requirements. Furthermore, within the frequency range of 12.00-40.00 GHz, the metamaterial achieves 100% effective absorption across the entire frequency range, fully demonstrating its enormous potential and design advantages in the field of broadband absorption.

[0012] Furthermore, one side of the rectangular shell on which the opening groove is provided is a square, and the opening shape of the opening groove is a square.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the present invention adopts a design with highly symmetrical geometric features, and the resulting metamaterial structure exhibits extremely low sensitivity to polarization. It can still maintain an efficient and stable absorption effect within a wide range of incident angles, demonstrating excellent anti-polarization interference ability and stability of absorption performance.

[0014] Furthermore, the opening groove surface of the rectangular shell, the top surface of the hollow cylindrical platform and the vertex of the cone are on the same horizontal plane.

[0015] Furthermore, the side length of the opening groove surface of the rectangular shell is 5-15 mm, the wall thickness is 0.1-1.0 mm, and the height of the rectangular shell is 2-5 mm.

[0016] Furthermore, the wall thickness of the hollow cylindrical platform is 0.2-1.5 mm.

[0017] Furthermore, the distance between the bottom surface of the cone and the bottom surface of the rectangular shell is equal to the wall thickness of the rectangular shell.

[0018] Furthermore, a broadband absorbing metamaterial with a cone-like structure is produced by 3D printing using SiBOC ceramic precursor as raw material and pyrolyzing it at 1000-1200°C.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is: by using 3D printed SiBOC ceramics as the preparation raw material, the present invention can achieve high-precision preparation of fully dense and complex structures through the DLP 3D printing process, which is fast, efficient and low-cost.

[0020] A second object of the present invention is to provide a broadband absorbing metamaterial array with a cone-like structure, which is manufactured by connecting and arranging a plurality of the above-mentioned broadband absorbing metamaterials with a cone-like structure as individual units.

[0021] The third object of the present invention is to provide applications of the above-mentioned broadband absorbing metamaterial with a cone-like structure and the broadband absorbing metamaterial array with a cone-like structure in military equipment, 5G communication base stations or satellite equipment.

[0022] The present invention has the following beneficial effects:

[0023] (1) This paper proposes a broadband absorbing metamaterial structure with a conical hat-like design, which exhibits excellent broadband absorbing capabilities in the microwave frequency band. Simulation results show that by flexibly adjusting key characteristic parameters, the structure can precisely control the absorbing characteristics to meet the needs of different applications. At the same time, within the frequency range of 12.00-40.00 GHz, the metamaterial achieves 100% effective absorption across the entire frequency band, fully demonstrating its great potential and design advantages in the field of broadband absorbing.

[0024] (2) The metamaterial structure designed in this invention has a highly symmetrical, conical-hat-like geometry, resulting in extremely low sensitivity to polarization. This structural design enables it to maintain efficient and stable absorption across a wide range of incident angles, demonstrating excellent resistance to polarization interference and stable absorption performance.

[0025] (3) The present invention utilizes 3D-printed SiBOC ceramics, which, through the DLP 3D printing process, can precisely fabricate complex and fully dense SiBOC ceramic structures, demonstrating the advantages of rapid, low-cost, and highly efficient production. In metamaterial applications, this design not only successfully broadens the material's absorption bandwidth but also significantly reduces its weight through the use of a hollow structure, providing important technical support for lightweight and high-performance absorbing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The intrinsic dielectric constant of SiBOC ceramics pyrolyzed at 900-1000℃ is shown in Figure 1, where A is the real part and B is the imaginary part.

[0027] Figure 2 The loss tangent diagram of SiBOC ceramics pyrolyzed at 900-1000℃;

[0028] Figure 3 Schematic diagram of the structure of a broadband absorbing metamaterial with a cone-shaped cap structure, where A is a top view and B is a cross-sectional view;

[0029] Figure 4 This is a graph showing the absorption performance of the broadband absorbing metamaterial with a cone-shaped cap structure optimized for the Ku band in Example 1;

[0030] Figure 5 This is a schematic structural diagram of the broadband wave-absorbing metamaterial array with a cone-hat-like structure in Example 1;

[0031] Figure 6 This is a graph showing the electromagnetic wave dissipation power distribution at different frequencies of the broadband absorbing metamaterial array with a cone-shaped cap structure in Example 1;

[0032] Figure 7 This is a graph showing the absorption performance of the broadband absorbing metamaterial with a cone-shaped cap structure optimized for the K-band in Example 2;

[0033] Figure 8 This is a graph showing the absorption performance of the broadband absorbing metamaterial with a cone-shaped cap structure optimized for the full frequency range of Ku, K, and Ka in Example 3;

[0034] Among them, 1-rectangular shell, 2-hollow cylindrical table, 3-cone. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples are only used to explain the present invention and are not intended to limit the scope of the invention. In the embodiments, if specific conditions are not specified, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0036] When designing absorbing metamaterials, the choice of materials is crucial. Taking dielectric materials as an example, different dielectric materials have different dielectric constants and loss tangent values. Dielectrics with high dielectric constants can enhance electric field confinement, change the propagation characteristics of electromagnetic waves, and guide them to develop in a direction that is conducive to absorption; dielectrics with larger loss tangents can convert more electrical energy into heat energy and directly consume electromagnetic wave energy. In the following embodiments, the present invention uses 3D printed SiBOC ceramics with independent intellectual property rights (preparation method see CN202210496894.2), and the intrinsic dielectric constant is the basic design parameter, such as Figure 1 As shown in Figure 3, it can be seen that with the increase of pyrolysis temperature, both the real and imaginary parts of the intrinsic dielectric constant of SiBOC ceramics increase significantly.

[0037] The loss tangent of SiBOC ceramics at three pyrolysis temperatures is further calculated, as follows: Figure 2 As shown in the figure, it can be seen that the sample pyrolyzed at 1100°C has the largest loss tangent, so the dielectric constant of this sample is selected as the basic design parameter. The SiBOC ceramics used in the following examples are all this ceramic, and the pyrolysis temperature is 1100°C.

[0038] Example 1:

[0039] A broadband absorbing metamaterial with a cone-shaped cap structure optimized for Ku band (schematic diagram as shown in the figure) Figure 3 As shown), it includes a rectangular shell 1, a hollow cylindrical platform 2 and a cone 3;

[0040] The rectangular shell 1 is a rectangular structure with two square sides. The side length of the square is 2l. An opening groove is set on one of the cube faces. The opening groove is a rectangular shape. The opening of the opening groove is square and the wall thickness is w.

[0041] A hollow cylindrical platform 2 is provided inside the opening groove of the rectangular shell 1. The bottom surface of the hollow cylindrical platform 2 is connected to the bottom surface of the opening groove. The outer wall of the hollow cylindrical platform 2 is circumscribed with the inner wall of the rectangular shell 1. The wall thickness of the hollow cylindrical platform 2 is a.

[0042] A cone 3 is provided inside the hollow cylindrical platform 2, and the bottom surface of the cone 3 is connected to the bottom surface of the hollow cylindrical platform 2;

[0043] The side of the rectangular shell 1 with the open groove, the top surface of the hollow cylindrical platform 2 and the vertex of the cone 3 are on the same horizontal plane. The height of the rectangular shell 1 is h, the distance between the bottom surface of the cone 3 and the bottom surface of the rectangular shell 1 is also w, and the height of the cone 3 is hw.

[0044] The method for preparing the broadband wave-absorbing metamaterial with a cone-hat-like structure optimized for the Ku band comprises the following steps:

[0045] According to Figure 3 The structure of the broadband absorbing metamaterial with a cone-like structure is modeled, and then a green body is prepared by 3D printing using SiBOC ceramic precursor as raw material. Finally, the broadband absorbing metamaterial with a cone-like structure is obtained by pyrolysis at 1100°C.

[0046] The present invention adopts a metamaterial structure design method based on the Effective Media Theory (EMT). The core concept of this theory is to approximate the periodic structure as a medium layer with uniform properties, thereby simplifying the calculation. Its theoretical basis comes from the study of diffraction optics, that is, when the size of the grating structure is smaller than the wavelength, the light wave and the structure will produce a specific interaction. The key to the equivalent medium theory is that when the unit size of the periodic structure is smaller than the wavelength of the incident light wave, the entire metamaterial can be regarded as a uniform medium, and the equivalent dielectric constant of this medium can be derived and calculated by analyzing the geometric properties of the metamaterial and the electromagnetic parameters of the material itself.

[0047] The core of the numerical analysis method of the electromagnetic field is to convert the discretized Maxwell equations into a computer program for solution. The present invention uses CST Studio Suite simulation software, which is based on the finite integration method to complete the simulation of the electromagnetic response characteristics, structural optimization and parameter adjustment of the metamaterial. In the simulation setting, the periodic unit method is adopted to calculate only one basic unit structure in the metamaterial, thereby significantly reducing the computational complexity and improving efficiency. By introducing the periodic boundary condition (PBC), approximate modeling of an infinite array of absorbing materials is achieved. The frequency domain finite element method is used in the calculation process, the boundary condition is set to Unit Cell, and the excitation source is provided through the Floquet port. Since the metal backplane model is the basis used in the actual test and calculation of RC, Z min The direction boundary is set to Electric Conductor to simulate the metal layer, Z max The direction is defined as the excitation port. Under this condition, the analysis of the simulation results focuses on S 11 On parameters.

[0048] The parameters of the absorbing metamaterial are designed for the Ku band (12-18 GHz), where w = 0.2 mm, h = 3.0 mm, a = 0.8 mm or 1.0 mm, and l = 3 mm or 4 mm.

[0049] The above method is used to simulate the absorption performance, and the results are as follows Figure 4 shown.

[0050] When w = 0.2mm, h = 3.0mm, the optimal parameters of the absorbing metamaterial unit structure optimized for the Ku band (12-18GHz) are a = 0.8mm, l = 3.0mm (with maximum absorption bandwidth), a = 1.0mm, l = 3.0mm (with minimum reflection coefficient). In the 12-40GHz band, the minimum reflection coefficient RC of the designed metamaterial is min = -22.44dB. Two absorption peaks are clearly visible in the figure. The effective absorption bandwidth (EAB) at the low-frequency end exceeds the entire Ku-band, demonstrating the effectiveness of targeted optimization. Combined with the absorption peak at the high-frequency end, the broadband absorbing metamaterial EAB with the cone-shaped cap structure reaches up to 28.1GHz (11.84-40.00GHz) under these parameters, covering the entire Ku-band.

[0051] A method for preparing a broadband wave-absorbing metamaterial array with a cone-cap-like structure comprises the following steps:

[0052] It can be obtained from electromagnetic simulation theory that the resonant frequency of the metamaterial is closely related to the size of the unit structure. The smaller the size, the higher the resonant frequency. By adjusting the unit size, the absorption frequency band can be flexibly controlled to meet the needs of different application scenarios such as millimeter waves and radar stealth. In terms of arrangement, the close distribution of units can enhance the electromagnetic coupling between adjacent units, thereby significantly improving the overall absorption performance. At the same time, by optimizing the structural design, especially introducing the symmetric axis layout, the sensitivity of the metamaterial to the incident angle of the electromagnetic wave can be effectively reduced, thereby achieving a more stable absorption effect. Based on the above theory, a metamaterial array composed of a cone-shaped hat is designed (the structural schematic diagram is shown in FIG. Figure 5 As shown in Figure 2, the array consists of 8×8 connected broadband absorbing metamaterials with cone-shaped cap structures. Figure 5 The structure shown in the figure was modeled, and the green body was prepared by 3D printing using SiBOC ceramic precursor as raw material. Finally, a broadband absorbing metamaterial array with a cone-like structure was obtained by pyrolysis at 1100°C.

[0053] By setting up an energy flux density monitor to monitor the energy distribution at different frequencies, we can intuitively understand the metamaterial's ability to dissipate electromagnetic wave energy at various frequencies (e.g. Figure 6 The study found that the response characteristics and dissipation distribution of the metamaterial structure exhibit significant differences at different frequencies. At low frequencies, the high-intensity energy dissipation is concentrated primarily along the ridges of the unit structure. As the frequency increases, the dissipation region shifts toward the top of the structure, concentrating at the upper edge and tip of the ridges of the cone-shaped cap-like structure. This phenomenon is consistent with the general trend of the interaction between the geometric properties of metamaterials and electromagnetic waves, and also demonstrates that the ability of the structural shape to control electromagnetic performance across different frequency ranges is a core advantage of its design.

[0054] Example 2:

[0055] A broadband absorbing metamaterial with a cone-shaped cap structure optimized for K-band (schematic diagram as shown in the figure) Figure 3 As shown), it includes a rectangular shell 1, a hollow cylindrical platform 2 and a cone 3;

[0056] The rectangular shell 1 is a rectangular structure with two square sides. The side length of the square is 2l. An opening groove is set on one of the cube faces. The opening groove is a rectangular shape. The opening of the opening groove is square and the wall thickness is w.

[0057] A hollow cylindrical platform 2 is provided inside the opening groove of the rectangular shell 1. The bottom surface of the hollow cylindrical platform 2 is connected to the bottom surface of the opening groove. The outer wall of the hollow cylindrical platform 2 is circumscribed with the inner wall of the rectangular shell 1. The wall thickness of the hollow cylindrical platform 2 is a.

[0058] A cone 3 is provided inside the hollow cylindrical platform 2, and the bottom surface of the cone 3 is connected to the bottom surface of the hollow cylindrical platform 2;

[0059] The side of the rectangular shell 1 with the open groove, the top surface of the hollow cylindrical platform 2 and the vertex of the cone 3 are on the same horizontal plane. The height of the rectangular shell 1 is h, the distance between the bottom surface of the cone 3 and the bottom surface of the rectangular shell 1 is also w, and the height of the cone 3 is hw.

[0060] The method for preparing the broadband wave-absorbing metamaterial with a cone-cap-like structure optimized for the K-band comprises the following steps:

[0061] According to Figure 3 The structure of the broadband absorbing metamaterial with a cone-like structure is modeled, and then a green body is prepared by 3D printing using SiBOC ceramic precursor as raw material. Finally, the broadband absorbing metamaterial with a cone-like structure is obtained by pyrolysis at 1100°C.

[0062] The parameters of the absorbing metamaterial are designed for the K-band (18-28 GHz), where w = 0.2 mm, h = 4.0 mm, a = 0.8 mm or 1.0 mm, and l = 5 mm or 6 mm.

[0063] The above method is used to simulate the absorption performance, and the results are as follows Figure 7 shown.

[0064] When w = 0.2mm, h = 4.0mm, the optimal parameters of the absorbing metamaterial unit structure optimized for the K band (18-28GHz) are a = 0.8mm, l = 5.0mm (with maximum absorption bandwidth), a = 1.0mm, l = 5.0mm (with minimum reflection coefficient). In the 12-40GHz band, when a = 1.0mm and l = 5.0mm, the designed metamaterial can achieve the minimum reflection coefficient RC min = -36.20dB. The figure clearly shows that there are still two absorption peaks. When a = 0.8mm and l = 5.0mm, the effective absorption bandwidth (EAB) at the low-frequency end exceeds the entire K-band, demonstrating the effectiveness of targeted optimization. Combined with the absorption peak at the high-frequency end, the broadband absorbing metamaterial EAB with the cone-shaped cap structure reaches up to 27.26GHz (12.74-40GHz) under these parameters, covering the entire K-band and 97.36% of the 12-40GHz range.

[0065] Example 3:

[0066] A broadband absorbing metamaterial with a cone-shaped cap structure optimized for Ku, K and Ka full-frequency absorption (schematic diagram as shown in the figure) Figure 3 As shown), it includes a rectangular shell 1, a hollow cylindrical platform 2 and a cone 3;

[0067] The rectangular shell 1 is a rectangular structure with two square sides. The side length of the square is 2l. An opening groove is set on one of the cube faces. The opening groove is a rectangular shape. The opening of the opening groove is square and the wall thickness is w.

[0068] A hollow cylindrical platform 2 is provided inside the opening groove of the rectangular shell 1. The bottom surface of the hollow cylindrical platform 2 is connected to the bottom surface of the opening groove. The outer wall of the hollow cylindrical platform 2 is circumscribed with the inner wall of the rectangular shell 1. The wall thickness of the hollow cylindrical platform 2 is a.

[0069] A cone 3 is provided inside the hollow cylindrical platform 2, and the bottom surface of the cone 3 is connected to the bottom surface of the hollow cylindrical platform 2;

[0070] The side of the rectangular shell 1 with the open groove, the top surface of the hollow cylindrical platform 2 and the vertex of the cone 3 are on the same horizontal plane. The height of the rectangular shell 1 is h, the distance between the bottom surface of the cone 3 and the bottom surface of the rectangular shell 1 is also w, and the height of the cone 3 is hw.

[0071] The method for preparing the above-mentioned broadband absorbing metamaterial with a cone-shaped cap structure optimized for full-frequency absorption of Ku, K and Ka comprises the following steps:

[0072] According to Figure 3 The structure of the broadband absorbing metamaterial with a cone-like structure is modeled, and then a green body is prepared by 3D printing using SiBOC ceramic precursor as raw material. Finally, the broadband absorbing metamaterial with a cone-like structure is obtained by pyrolysis at 1100°C.

[0073] The parameters of the absorbing metamaterial are designed for the K-band (18-28 GHz), where w = 0.2 mm, h = 4.0 mm, a = 0.4 mm, 0.6 mm, 0.8 mm or 1.0 mm, and l = 3 mm.

[0074] The above method is used to simulate the absorption performance, and the results are as follows Figure 8 shown.

[0075] When w = 0.2mm, h = 4.0mm, l = 3.0mm, the optimal parameters of the absorbing metamaterial unit structure for Ku, K and Ka full-frequency absorption optimization are a = 0.4mm (with maximum absorption bandwidth) and a = 0.8mm (with minimum reflection coefficient). In the 12-40GHz band, when a = 0.4mm, the designed metamaterial can achieve the minimum reflection coefficient RC min=-29.16dB. It can be clearly seen from the figure that there are still two absorption peaks. When a = 0.8mm, the effective absorption bandwidth EAB of the broadband absorbing metamaterial with a cone-shaped cap structure covers the entire Ku, K and Ka bands (12.00-40.00GHz), demonstrating the excellent performance of the structure in ultra-wideband absorption.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A broadband wave-absorbing metamaterial with a cone-shaped cap structure, characterized in that: It comprises a rectangular shell (1), a hollow cylindrical platform (2) and a cone (3); An open groove is provided on one side of the rectangular shell (1); The hollow cylindrical platform (2) is arranged inside the opening groove, and the outer side wall of the hollow cylindrical platform (2) is circumscribed with the inner side wall of the rectangular shell (1); The cone (3) is arranged inside the hollow cylindrical platform (2), and the bottom surface of the cone (3) is connected to the bottom surface of the hollow cylindrical platform (2).

2. The broadband wave-absorbing metamaterial with a cone-hat-like structure according to claim 1, characterized in that: The rectangular shell (1) has a square side on which the opening groove is provided, the shape of the opening groove is a rectangular body, and the shape of the opening of the opening groove is a square.

3. The broadband wave-absorbing metamaterial with a cone-hat-like structure according to claim 1, characterized in that: The side of the rectangular shell (1) where the opening groove is provided, the top surface of the hollow cylindrical platform (2) and the apex of the cone (3) are on the same horizontal plane.

4. The broadband wave-absorbing metamaterial with a cone-hat-like structure according to claim 2, characterized in that: The side length of the rectangular shell (1) on which the opening groove is provided is 5-15 mm, the wall thickness is 0.1-1.0 mm, and the height of the rectangular shell (1) is 2-5 mm.

5. The broadband wave-absorbing metamaterial with a cone-hat-like structure according to claim 1, characterized in that: The wall thickness of the hollow cylindrical platform (2) is 0.2-1.5 mm.

6. The broadband wave-absorbing metamaterial with a cone-hat-like structure according to claim 1, characterized in that: The broadband wave-absorbing metamaterial with a cone-like structure is prepared by 3D printing using a SiBOC ceramic precursor as a raw material and pyrolyzing it at 1000-1200°C.

7. A broadband wave-absorbing metamaterial array with a cone-shaped cap structure, characterized in that: The broadband wave-absorbing metamaterial with a cone-like structure according to any one of claims 1 to 6 is connected and arranged as individual units to obtain the metamaterial.

8. Use of the broadband absorbing metamaterial with a cone-like structure according to any one of claims 1 to 6 and the broadband absorbing metamaterial array with a cone-like structure according to claim 7 in military equipment, 5G communication base stations, or satellite equipment.

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