Wave absorbing unit and wave absorbing structure
By designing a torsional conical structure in the absorbing unit, the problem of insufficient absorption performance of existing conical absorbing materials at low frequencies is solved, achieving effective absorption of low-frequency electromagnetic waves and meeting the needs of specific scenarios.
Patent Information
- Application Number
- CN202423184256.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing conical absorbing materials are difficult to achieve multiple effective reflections and absorptions when the frequency drops below 1 GHz, resulting in deterioration of the absorbing material's performance and making it unable to meet the needs of specific scenarios.
Design a wave-absorbing unit where the cross-section of the absorbing body gradually decreases from bottom to top and is rotated relative to it at a preset angle in the horizontal direction to form a torsional cone structure, thereby increasing the number of electromagnetic wave reflections and extending the reflection path.
By increasing the number of reflections and extending the reflection path, the operating frequency was expanded, the absorption performance for low-frequency electromagnetic waves was improved, and the absorption effect of the absorbing material at low frequencies was enhanced.
Smart Images
Figure CN223626226U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electromagnetic wave absorbing materials technology, and more specifically, to a wave absorbing unit and a wave absorbing structure. Background Technology
[0002] Microwave-absorbing materials are functional materials commonly used in microwave anechoic chambers. They can absorb or significantly reduce the electromagnetic wave energy received on their surface, thereby reducing electromagnetic interference.
[0003] Microwave absorbing materials can be categorized into two types based on their application: coating-type and structured-type. Coating-type materials involve applying a mixture of absorbent (such as metal or alloy powder, ferrite, conductive fibers, etc.) and binder to the target surface to form an absorbing coating. Structured-type materials disperse the absorbent within a three-dimensional structural material, including flat, wedge-shaped, and conical shapes. Structured absorbing materials are better suited to different application scenarios and electromagnetic environments, improving absorption performance and overall usability.
[0004] Conical absorbing materials are widely used in microwave anechoic chambers. By being installed on the walls, floors, ceilings, and other areas of the microwave anechoic chamber, they absorb incident electromagnetic waves, reduce reflection and scattering, and thus simulate a test environment close to free space. This is crucial for improving the accuracy and reliability of electromagnetic testing.
[0005] Conical absorbing materials are mostly pyramid-shaped structures, which can generally meet the absorption performance requirements of frequencies from 1GHz to 40GHz. However, when the operating frequency is reduced to below 1GHz, due to the shape limitations such as the apex angle of the cone and the ratio of cone height to base height of the cone unit, electromagnetic waves cannot be effectively reflected and absorbed multiple times, resulting in the deterioration of the absorbing material performance and making it difficult to meet the needs of specific scenarios. Utility Model Content
[0006] The purpose of this invention is to improve the problem in the prior art that when facing electromagnetic waves with frequencies reduced to below 1 GHz, the absorbing material is difficult to perform multiple effective reflections and absorptions, which leads to the deterioration of the absorbing material's performance and makes it difficult to meet the needs of specific scenarios.
[0007] The embodiments of this utility model can be implemented as follows:
[0008] An embodiment of this utility model provides a wave-absorbing unit, comprising:
[0009] seat body;
[0010] A wave-absorbing body is disposed on the base; the cross-sectional area of the wave-absorbing body gradually decreases from bottom to top, and the wave-absorbing body has a first cross-section and a second cross-section in the horizontal direction, the first cross-section is located above the second cross-section, and the first cross-section and the second cross-section are similar polygons; in the horizontal direction, the first cross-section is rotated relative to the second cross-section by a preset angle.
[0011] The advantages of the absorbing unit provided by this utility model compared to the prior art include:
[0012] In this absorbing unit, the absorbing body is shaped like a pyramid, with the upper first cross-section rotating relative to the lower second cross-section. This means that the absorbing body at least partially resembles a twisted pyramid shape. This increases the number of reflections of electromagnetic waves within the periodic structure of the absorbing body, lengthens the reflection path, expands the operating frequency, and improves the absorption performance of the absorbing body for low-frequency electromagnetic waves. Based on this, this absorbing unit can address the problem in existing technologies where absorbing materials struggle to achieve multiple effective reflections and absorptions when facing electromagnetic waves with frequencies below 1 GHz, leading to performance degradation and failure to meet the requirements of specific scenarios.
[0013] Optionally, the preset angle is proportional to the distance between the first cross-section and the second cross-section.
[0014] Optionally, the first cross-section is the top surface of the absorbing body, and the second cross-section is the bottom surface of the absorbing body; the preset angle ranges from 30° to 70°.
[0015] Optionally, the first cross-section and the second cross-section are hexagonal or quadrilateral.
[0016] Optionally, the line connecting the center of the first cross-section and the center of the second cross-section is perpendicular to the first cross-section and the second cross-section.
[0017] Optionally, the first cross-section is rotated clockwise relative to the second cross-section, and / or the first cross-section is rotated counterclockwise relative to the second cross-section.
[0018] Optionally, the base is prism-shaped; and the cross-sectional shape of the base is a similar polygon to the first cross-section.
[0019] A microwave absorbing structure includes at least two of the above-mentioned microwave absorbing units, adjacent bases are spliced together, and in two adjacent microwave absorbing bodies, the first cross-section rotates in the same direction relative to the second cross-section.
[0020] A microwave absorbing structure includes at least two of the above-mentioned microwave absorbing units, adjacent bases are spliced together, and in two adjacent microwave absorbing bodies, the first cross-section rotates in opposite directions relative to the second cross-section.
[0021] A wave-absorbing structure includes a regular pyramidal unit and the aforementioned wave-absorbing unit; the regular pyramidal unit includes a base and a wave-absorbing part disposed on the base, the base is cylindrical, and the wave-absorbing part is a frustum or a regular pyramidal shape; any of the bases is adjacent to and spliced with at least one of the bases.
[0022] The absorbing structure provided by this utility model adopts the above-mentioned absorbing unit. The beneficial effects of this absorbing structure compared with the prior art are the same as the beneficial effects of the absorbing unit provided above compared with the prior art, and will not be repeated here. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the structure of the absorbing unit provided in the embodiments of this application from a first-view perspective;
[0025] Figure 2 This is a schematic diagram of the structure of the absorbing unit provided in the embodiments of this application from a second perspective;
[0026] Figure 3 This is one of the structural schematic diagrams of the wave-absorbing structure provided in the embodiments of this application;
[0027] Figure 4 This is the second schematic diagram of the absorbing structure provided in the embodiments of this application;
[0028] Figure 5 This is a schematic diagram of the structure of the regular pyramidal unit provided in the embodiments of this application;
[0029] Figure 6 This is the third schematic diagram of the absorbing structure provided in the embodiments of this application;
[0030] Figure 7 This is the fourth schematic diagram of the absorbing structure provided in the embodiments of this application;
[0031] Figure 8 This is a comparison curve of the control groups and experimental groups provided in the embodiments of this application, tested in electromagnetic wave environments at different frequency bands.
[0032] Figures 9 to 13 This is a comparison curve of the absorption performance of control group 1 and experimental group 3 at different incident angles in the 0-2GHz frequency band, provided in the embodiments of this application.
[0033] Icons: 10-Absorbing unit; 100-Base; 200-Absorbing body; 11-Absorbing structure; 12-Right pyramidal unit; 121-Base; 122-Absorbing section. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0038] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0039] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.
[0040] This application provides an absorbing unit 10 and an absorbing structure 11 using the absorbing unit 10 to improve the technical problem in the prior art where electromagnetic waves cannot be effectively reflected and absorbed multiple times, leading to the deterioration of the performance of the absorbing material and making it difficult to meet the needs of specific scenarios. It is worth noting that the absorbing unit 10 and the absorbing structure 11 can be applied in application environments such as anechoic chambers to process electromagnetic waves in a specified environment, which can facilitate the performance of radio testing and other operations.
[0041] In this embodiment, the absorbing unit 10 includes a base 100 and an absorbing body 200. The absorbing body 200 is disposed on the base 100. When the absorbing unit 10 is applied in an anechoic chamber, the electromagnetic wave processing is mainly performed by the absorbing body 200, that is, the electromagnetic wave reflection and absorption are mainly achieved by the absorbing body 200. The cross-sectional area of the absorbing body 200 gradually decreases from bottom to top, and the absorbing body 200 has a first cross-section and a second cross-section in the horizontal direction. The first cross-section is located above the second cross-section, and the first and second cross-sections are similar polygons. In the horizontal direction, the first cross-section is rotated relative to the second cross-section by a predetermined angle.
[0042] The first cross-section and the second cross-section can be any two cross-sections on the absorbing body 200, with the first cross-section located above the second cross-section. Based on this, the preset angle of rotation of the first cross-section relative to the second cross-section may also differ depending on the selected first and second cross-sections. For example, when the first cross-section is closer to the second cross-section, the preset angle is smaller; while when the first cross-section is farther from the second cross-section, the preset angle is larger. Furthermore, "the first and second cross-sections are similar polygons" means: firstly, both the first and second cross-sections are polygons; secondly, the shape of the first cross-section is similar to the shape of the second cross-section. For example, when the first cross-section is a regular hexagon, the second cross-section is also a regular hexagon; when the first cross-section is a regular square, the second cross-section is also a regular square.
[0043] In the horizontal direction, the rotation of the first cross-section relative to the second cross-section by a predetermined angle refers to: taking a regular frustum-shaped structure as a reference, forming two cross-sections arranged vertically, with the upper cross-section rotating horizontally relative to the other cross-section by a predetermined angle. The cross-section formed after this rotation can be considered the first cross-section, while the lower cross-section can be considered the second cross-section. Based on this method, the entire absorbing body 200 takes on a torsional conical or frustum-shaped structure, such as... Figure 1 As shown.
[0044] It is worth noting that part of the structure of the absorbing body 200 can also be set as the torsion-shaped frustum structure described above, while another part of the structure can be set as a regular truncated pyramid structure.
[0045] As described above, in this absorbing unit 10, the absorbing body 200 is shaped with a smaller upper section and a larger lower section, and the upper first cross-section rotates relative to the lower second cross-section. This means that the absorbing body 200 at least partially resembles a twisted pyramid. This increases the number of reflections of electromagnetic waves within the periodic structure of the absorbing body 200, lengthens the reflection path, expands the operating frequency, and improves the absorption performance of the absorbing body 200 for low-frequency electromagnetic waves. Based on this, the absorbing unit 10 can address the problem in existing technologies where absorbing materials struggle to achieve multiple effective reflections and absorptions when facing electromagnetic waves with frequencies below 1 GHz, leading to performance degradation and difficulty in meeting specific application requirements.
[0046] Furthermore, in this embodiment, the preset angle is proportional to the distance between the first cross-section and the second cross-section. This can also be viewed as the absorbing body 200 achieving torsion through uniform rotation. This facilitates the standardization of the shape and structure of the absorbing body 200, reduces the processing difficulty of the absorbing body 200, and lowers processing costs.
[0047] Of course, in other embodiments, the torsion angle of the absorbing body 200 can also be set in an irregular manner to suit actual needs.
[0048] In this embodiment, the first cross-section is the top surface of the absorbing body 200, and the second cross-section is the bottom surface of the absorbing body 200; the preset angle ranges from 30° to 70°. Specifically, when the first cross-section is the top surface of the absorbing body 200 and the second cross-section is the bottom surface, this represents the maximum angle of relative rotation between the two cross-sections of the absorbing body 200. Research has shown that, based on the above, when the preset angle is between 30° and 70°, the preset angle is positively correlated with the absorption performance of the absorbing body 200. If the preset angle is too small, the absorption performance of the absorbing body 200 is not significantly different from that of a typical frustum-shaped absorbing element; while if the preset angle is too large, the absorption performance is not significantly improved, but rather the manufacturing difficulty is increased, reducing practicality. Therefore, it is preferable to set the preset angle range to 30°-70°.
[0049] In other words, when the first cross-section is the top surface of the absorbing body 200 and the second cross-section is the bottom surface of the absorbing body 200, the preset angle can be 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, or 70°, etc.
[0050] In this embodiment, the first cross-section and the second cross-section are preferably hexagonal or quadrilateral; more preferably, they are regular hexagonal or regular quadrilateral. When the first cross-section and the second cross-section are hexagonal or quadrilateral, the absorption performance of the absorbing body 200 is superior, and the manufacturing difficulty of the absorbing body 200 is lower. It should be understood that in other embodiments, the first cross-section and the second cross-section can also be set to other shapes, such as triangles, pentagons, or octagons.
[0051] Furthermore, in this embodiment, the line connecting the center of the first cross-section and the center of the second cross-section is perpendicular to both. It can also be viewed as the absorber body 200 being formed by twisting a regular frustum pyramid; when viewed from above the absorber body 200, the top surface is the center of the overall shape, as shown below. Figure 2 Of course, in other embodiments, when the above-mentioned connecting line forms an angle other than 90° with the first cross section and the second cross section, it can be regarded as the wave-absorbing body 200 being formed by twisting an oblique pyramidal frustum structure.
[0052] Optionally, in this embodiment, the first cross-section rotates clockwise relative to the second cross-section, and / or the first cross-section rotates counterclockwise relative to the second cross-section. Here, "and / or" means that only the first cross-section rotates clockwise relative to the second cross-section, meaning the torsional direction of the entire absorbing body 200 remains unchanged; or only the first cross-section rotates counterclockwise relative to the second cross-section, meaning the torsional direction of the entire absorbing body 200 remains unchanged; or a portion of the first cross-section rotates clockwise relative to the second cross-section, and a portion of the first cross-section rotates counterclockwise relative to the second cross-section; meaning that part of the structure of the absorbing body 200 exhibits a clockwise torsion, while another portion exhibits a counterclockwise torsion.
[0053] Of course, considering the manufacturing difficulty, preferably, in this embodiment, the absorbing body 200 adopts a configuration with the same twisting direction, for example, Figure 1The wave-absorbing body 200 shown is illustrated.
[0054] In this embodiment, the base 100 is prismatic; and the cross-sectional shape of the base 121 is a similar polygon to the first cross-section. The bottom surface of the absorbing body 200 is the same as the cross-section of the base 100, and multiple edges of the bottom surface of the absorbing body 200 coincide with the top surface of the base 100.
[0055] Based on the wave-absorbing unit 10 provided above, this application embodiment also provides a wave-absorbing structure 11, which adopts the wave-absorbing unit 10 described above.
[0056] In a wave-absorbing structure 11, such as Figure 3 The absorbing structure 11 includes at least two of the aforementioned absorbing units 10, with adjacent bases 100 joined together. In two adjacent absorbing bodies 200, the first cross-section rotates in the same direction relative to the second cross-section. That is, in adjacent absorbing bodies 200, the first cross-section of one absorbing body 200 is arranged in a clockwise rotation relative to the second cross-section, and the first cross-section of the other absorbing body 200 is also arranged in a clockwise rotation relative to the second cross-section.
[0057] In another absorbing structure 11, such as Figure 4 The absorbing structure 11 includes at least two of the aforementioned absorbing units 10, with adjacent bases 100 joined together. In two adjacent absorbing bodies 200, the first cross-section rotates in opposite directions relative to the second cross-section. This means that the absorbing structure 11 has at least two adjacent absorbing units 10 arranged in opposite directions of torsion.
[0058] In another type of wave-absorbing structure 11, such as Figures 5-7 The wave-absorbing structure 11 includes a regular pyramidal unit 12 and the aforementioned wave-absorbing unit 10. The regular pyramidal unit 12 includes a base 121 and a wave-absorbing portion 122 disposed on the base 121. The base 121 is cylindrical, and the wave-absorbing portion 122 is a frustum or a regular pyramid. Each base 100 is adjacent to and spliced with at least one base 121. This means that the wave-absorbing body 200 in a torsional form and the regular pyramidal unit 12 in a frustum form are used in combination and spliced in an alternating manner.
[0059] Based on the microwave absorbing unit 10 and microwave absorbing structure 11 provided above, this application also provides comparative tests of multiple structures.
[0060] The experimental structures used include:
[0061] Control group 1: a wave-absorbing structure 11 composed of multiple regular pyramidal units 12. The base 121 of the regular pyramidal unit 12 is a regular square prism, and the wave-absorbing part 122 is a regular square frustum. The total height of the regular pyramidal unit 12 is 300mm, the height of the base 121 is 65mm, and the side length is 45mm.
[0062] Control group 2: a wave-absorbing structure 11 composed of multiple regular pyramidal units 12. The base 121 of the regular pyramidal unit 12 is a regular hexagonal prism, and the wave-absorbing part 122 is a regular hexagonal frustum. The total height of the regular pyramidal unit 12 is 300mm, the height of the base 121 is 65mm, and the side length is 45mm.
[0063] Experimental Group 1: An absorbing structure 11 composed of multiple absorbing units 10. The base 100 of the absorbing unit 10 is a regular square prism. The first and second cross sections of the absorbing body 200 are regular squares. The preset angle of rotation of the top surface of the absorbing body 200 relative to the bottom surface of the absorbing body 200 is 70°. The total height of the absorbing unit 10 is 300mm, the height of the base 100 is 65mm, and the side length is 45mm.
[0064] Experimental Group 2: An absorbing structure 11 composed of multiple absorbing units 10. The base 100 of the absorbing unit 10 is a regular hexagonal prism. The first and second cross sections of the absorbing body 200 are regular hexagons. The preset angle of rotation of the top surface of the absorbing body 200 relative to the bottom surface of the absorbing body 200 is 70°. The total height of the absorbing unit 10 is 300mm, the height of the base 100 is 65mm, and the side length is 45mm.
[0065] Experimental Group 3: An absorbing structure 11 consisting of multiple absorbing units 10 and multiple regular pyramidal units 12. The shape and size of the absorbing units 10 are the same as those in Experimental Group 2; the shape and size of the regular pyramidal units 12 are the same as those in Control Group 2.
[0066] Experimental Group 4: An absorbing structure 11 consisting of multiple absorbing units 10 and multiple regular pyramid units 12. The shape of the absorbing unit 10 is the same as that of the absorbing unit 10 in Experimental Group 2, with a total height of 300 mm, a base 100 height of 65 mm, and a side length of 75 mm. The shape of the regular pyramid unit 12 is the same as that of the regular pyramid unit 12 in Control Group 2, with a total height of 300 mm, a base 121 height of 65 mm, and a side length of 75 mm.
[0067] The above-mentioned control groups and experimental groups were tested in electromagnetic wave environments at different frequency bands, with reference to... Figure 8 and the following table (where, Figure 8 The horizontal axis represents frequency, and the vertical axis represents absorption rate. It should be noted that... Figure 8The following table illustrates the absorption performance under normal incidence (i.e., an incidence angle of 0°);
[0068]
[0069]
[0070] It can be seen that the absorption performance of each experimental group is improved compared with the control group. Among them, compared with the control group 2, the absorption performance of experimental group 2 is improved by about 2-3dB in some frequency bands, especially at the 1.3GHz frequency point, where there is an improvement of up to 8.5dB. Compared with the most common control group 1 in the prior art, experimental group 2 also has a significant improvement in the absorption performance in some frequency bands. Moreover, compared with the control group 1, the resonance peak of experimental group 2 shifts to the left, thereby reducing the frequency point at which the absorption performance reaches -30dB. The absorption performance of experimental group 3 can reach -30dB at around 0.5GHz and remains basically below -40dB after 1GHz. As for experimental group 4, due to the increase in height to 450mm, the performance is further significantly optimized, and the frequency point at which the -30dB is reached is reduced to 0.4GHz.
[0071] In addition, the absorption performance of control group 1 and experimental group 3 at different incident angles (0°, 20°, 30°, 40°) in the 0-2GHz frequency band was compared, with reference to... Figures 9-13 It can be seen that compared with control group 1, experimental group 3 slightly sacrificed the high-frequency (above 1GHz) absorption performance, but the resonance peak shifted to the left at multiple incident angles, thus achieving an absorption performance of -30dB at a lower frequency. In other words, experimental group 3 improved the absorption performance at multiple incident angles at low frequencies (below 1GHz).
[0072] In summary, in the absorbing unit 10 and absorbing structure 11 provided in this embodiment, the absorbing body 200 is shaped such that the upper first cross-section is smaller than the lower cross-section, and the upper cross-section rotates relative to the lower second cross-section. This means that the absorbing body 200 at least partially resembles a twisted pyramid. This increases the number of reflections of electromagnetic waves within the periodic structure of the absorbing body 200, extends the reflection path, expands the operating frequency, and improves the absorption performance of the absorbing body 200 for low-frequency electromagnetic waves. Based on this, the absorbing unit 10 can improve the problem in the prior art where, when facing electromagnetic waves with frequencies below 1 GHz, the absorbing material struggles to achieve multiple effective reflections and absorptions, leading to performance degradation and difficulty in meeting the requirements of specific scenarios.
[0073] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A wave-absorbing unit, characterized in that, include: seat body; A wave-absorbing body is disposed on the base; the cross-sectional area of the wave-absorbing body gradually decreases from bottom to top, and the wave-absorbing body has a first cross-section and a second cross-section in the horizontal direction, the first cross-section is located above the second cross-section, and the first cross-section and the second cross-section are similar polygons; In the horizontal direction, the first cross-section is rotated by a preset angle relative to the second cross-section.
2. The absorbing unit according to claim 1, characterized in that, The preset angle is proportional to the distance between the first cross-section and the second cross-section.
3. The absorbing unit according to claim 1, characterized in that, The first cross-section is the top surface of the absorbing body, and the second cross-section is the bottom surface of the absorbing body; the preset angle ranges from 30° to 70°.
4. The absorbing unit according to claim 1, characterized in that, The first cross-section and the second cross-section are hexagonal or quadrilateral.
5. The absorbing unit according to claim 1, characterized in that, The line connecting the center of the first cross section and the center of the second cross section is perpendicular to the first cross section and the second cross section.
6. The absorbing unit according to claim 1, characterized in that, The first cross section rotates clockwise relative to the second cross section, and / or the first cross section rotates counterclockwise relative to the second cross section.
7. The absorbing unit according to claim 1, characterized in that, The base is prism-shaped; and the cross-sectional shape of the base is a similar polygon to the first cross-section.
8. A wave-absorbing structure, characterized in that, It includes at least two absorbing units as described in any one of claims 1-7, adjacent bases are spliced together, and in two adjacent absorbing bodies, the first cross-section rotates in the same direction relative to the second cross-section.
9. A wave-absorbing structure, characterized in that, It includes at least two absorbing units as described in any one of claims 1-7, adjacent bases are spliced together, and in two adjacent absorbing bodies, the first cross-section rotates in opposite directions relative to the second cross-section.
10. A wave-absorbing structure, characterized in that, It includes a regular pyramidal unit and a wave-absorbing unit as described in any one of claims 1-7; the regular pyramidal unit includes a base and a wave-absorbing part disposed on the base, the base is cylindrical, and the wave-absorbing part is a frustum or a regular pyramidal shape; any of the bases is adjacent to and spliced with at least one of the bases.