Wave absorber unit and wave absorber structure

Abstract

A wave absorber unit characterized in that it comprises: a base body; and a wave-absorbing main body arranged on the base body; wherein the cross-sectional area of ​​the wave-absorbing main body gradually decreases from bottom to top, and the wave-absorbing main body has a first cross-section and a second cross-section in a horizontal direction, wherein the first cross-section lies above the second cross-section, and the first cross-section and the second cross-section have similar polygonal shapes; and wherein, in the horizontal direction, the first cross-section is rotated by a predetermined angle relative to the second cross-section.

Description

Technical field The present disclosure relates to the technical field of electromagnetic wave absorbing materials, and in particular relates to a wave absorber unit and a wave absorber structure. Technical background Wave-absorbing materials are a type of functional material commonly used in microwave absorber chambers. They can absorb or significantly attenuate electromagnetic wave energy received by their surface, thereby reducing electromagnetic interference. Depending on their application, wave-absorbing materials can be divided into two types: wave-absorbing coating materials and wave-absorbing structural materials. Wave-absorbing coating materials consist of a mixture of an absorbent (such as metal or alloy powders, ferrites, conductive fibers, etc.) and a binder applied to a target surface, forming a layer of wave-absorbing coating. Wave-absorbing structural materials are formed by dispersing an absorbent in a three-dimensional structure, including flat wave-absorbing materials, wedge-shaped wave-absorbing materials, and conical wave-absorbing materials, among others.The wave-absorbing structural materials can better adapt to different application scenarios and electromagnetic environments, improving wave-absorbing effect and operational performance. Cone-shaped wave-absorbing materials are widely used in microwave anechoic chambers. By being attached to areas such as the walls, floors, and ceilings of microwave anechoic chambers, they absorb incident electromagnetic waves and reduce reflections and scattering, thus creating a test environment analogous to free space, which is crucial for improving the accuracy and reliability of electromagnetic tests. Conical wave-absorbing materials are typically angular cone structures, for example, in a pyramid shape, and can generally meet absorption performance requirements in the 1 GHz to 40 GHz frequency band. However, if the operating frequency is reduced below 1 GHz, electromagnetic waves cannot be effectively reflected and absorbed multiple times due to shape limitations such as the apex angle of an individual cone and the ratio of cone height to base height. This leads to a deterioration in the wave-absorbing material's performance and makes it difficult to meet the requirements of certain scenarios. Subject of the revelation The present disclosure is based on the objective of mitigating the problem present in the prior art that it is difficult for wave-absorbing materials to effectively reflect and absorb electromagnetic waves with a frequency of less than 1 GHz multiple times, which leads to a deterioration of the behavior of wave-absorbing materials and makes it difficult to meet the requirements of certain scenarios. The embodiments of this disclosure can be implemented as follows: One embodiment of the present disclosure provides a wave absorber unit comprising: a base body; and a wave-absorbing main body arranged on the base body; wherein the cross-sectional area of ​​the wave-absorbing main body gradually decreases from bottom to top, and the wave-absorbing main body has, in a horizontal direction, a first cross-section and a second cross-section, wherein the first cross-section lies above the second cross-section, and the first cross-section and the second cross-section have similar polygonal shapes; and wherein, in the horizontal direction, the first cross-section is rotated by a predetermined angle relative to the second cross-section. The wave absorber unit provided in this disclosure has the following advantages over the prior art: In this wave absorber unit, the wave-absorbing main body is depicted in a state in which the upper part is smaller and the lower part is larger, and the upper first cross-section is rotated relative to the lower second cross-section. This means that the wave absorbing main body is represented, at least partially, as a pattern formed by a twisted pyramid. This allows the number of reflections of electromagnetic waves in the periodic structure of the wave absorbing main body to be increased, the reflection path to be lengthened, the operating frequency range to be extended, and the ability of the wave absorbing main body to absorb low-frequency electromagnetic waves to be improved.Based on this, this wave absorber unit can mitigate the problem present in the prior art that it is difficult for wave-absorbing materials to effectively reflect and absorb electromagnetic waves with a frequency of less than 1 GHz multiple times, which leads to a deterioration of the behavior of wave-absorbing materials and makes it difficult to meet the requirements of certain scenarios. Alternatively, the specified angle is directly proportional to the distance between the first cross-section and the second cross-section. Alternatively, the first cross-section is the top surface of the wave-absorbing main body, and the second cross-section is the base surface of the wave-absorbing main body; and the specified angle is in the range of 30°-70°. Alternatively, the first and second cross-sections can be hexagonal or square. Alternatively, the connecting line between the center point of the first cross-section and the center point of the second cross-section is perpendicular to the first cross-section and the second cross-section. Alternatively, 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. Alternatively, the basic body is prismatic; and the cross-sectional shape of the base is a similar polygon to the first cross-section. A wave absorber structure comprises at least two wave absorber units as described above, wherein adjacent base bodies are connected to each other, and in two adjacent wave-absorbing main bodies, the first cross-sections are each rotated in the same direction relative to the corresponding second cross-section. A wave absorber structure comprises at least two wave absorber units as described above, wherein adjacent base bodies are connected to each other, and in two adjacent wave-absorbing main bodies, the first cross-sections are each rotated in opposite directions relative to the corresponding second cross-section. A wave absorber structure comprises a regular pyramid unit and a wave absorber unit as described above; the regular pyramid unit comprises a base and a wave-absorbing section arranged on the base, the base being columnar, and the wave-absorbing section being either a regular truncated pyramid or a regular pyramid; and one of the base bodies adjoins and is connected to at least one of the bases. The wave absorber structure provided in this disclosure uses the wave absorber unit described above; the advantageous effects of this wave absorber structure compared to the prior art are identical to the advantageous effects of the wave absorber unit provided above compared to the prior art, and repeated description is omitted here. Description of drawings To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for these embodiments are briefly presented below. It is understood that the following drawings show only some embodiments of this disclosure and therefore should not be considered as limiting the scope. A person skilled in the art could obtain further relevant drawings from these drawings without inventive step. Fig. 1 shows a schematic structural representation of a wave absorber unit according to an embodiment of the present disclosure from a first perspective; Fig. 2 shows a schematic structural representation of the wave absorber unit according to an embodiment of the present disclosure from a second perspective; Fig. 3 shows a first schematic structural representation of a wave absorber structure according to an embodiment of the present disclosure; Fig.Figure 4 shows a second schematic structural representation of the wave absorber structure according to an embodiment of the present disclosure; Figure 5 shows a schematic structural representation of a regular pyramid unit according to an embodiment of the present disclosure; Figure 6 shows a third schematic structural representation of the wave absorber structure according to an embodiment of the present disclosure; Figure 7 shows a fourth schematic structural representation of the wave absorber structure according to an embodiment of the present disclosure; Figure 8 shows a comparison curve diagram of respective control groups and respective experimental groups according to embodiments of the present disclosure, which are tested in electromagnetic wave environments with different frequency bands; and Figures 9, 10, 11, 12 to 13.Figure 13 shows comparison curve diagrams of absorption performance of control group 1 and experimental group 3 according to embodiments of the present disclosure at different angles of incidence in the frequency band of 0-2 GHz. Reference symbols: 10-wave absorber unit; 100-base body; 200-wave absorbing main body; 11-wave absorber structure; 12-regular pyramid unit; 121-base; and 122-wave absorbing section. Detailed description of embodiments To clarify the tasks, technical solutions, and advantages of the embodiments of this disclosure, the technical solutions in these embodiments are described below with reference to the drawings. Naturally, the described embodiments are only partial embodiments, not all embodiments of the disclosure. In general, the components of the embodiments of this disclosure, which are described and illustrated here in the drawings, can be arranged and configured in several different ways. Therefore, the following detailed description of embodiments of this disclosure, provided in the drawings, should only represent selected embodiments of this disclosure, rather than limiting the claimed scope of this disclosure. All further embodiments that could be obtained by a person skilled in the art based on the embodiments in this disclosure without inventive step fall within the scope of protection of the disclosure. It should be noted that similar reference symbols and letters in the following drawings refer to similar objects; therefore, an object does not need to be further defined and explained in subsequent drawings once it has been defined in one drawing. In describing this revelation, it must be pointed out that orientation or positional relationships indicated by terms such as "above", "below", "inside", and "outside", etc., are orientation or positional relationships shown based on the drawings, or in which a product of this revelation is conventionally placed; and that the terms serve only to favorably describe the revelation and to simplify the description, rather than suggesting or implying that the mentioned device or element must have a specific orientation and be constructed and operated in a specific orientation, and therefore must not be understood as limitations of the revelation. Furthermore, terms such as "first-" and "second-", if used, serve only for the purpose of different descriptions and should not be understood as suggesting or implying any importance in relativity. It should be noted that the features in the embodiments of this disclosure can be combined without causing a contradiction. In the embodiments of the present disclosure, a wave absorber unit 10 and a wave absorber structure 11 utilizing the wave absorber unit 10 are provided to mitigate the prior art technical problem that electromagnetic waves cannot be effectively reflected and absorbed multiple times, which leads to a deterioration in the performance of wave-absorbing materials and makes it difficult to meet the requirements of certain scenarios. It is worth noting that this wave absorber unit 10 and the wave absorber structure 11 can be used in application environments such as absorber chambers to process electromagnetic waves in a specified environment, thus facilitating the execution of operations such as radio tests. In the present embodiment, the wave absorber unit 10 comprises a base body 100 and a wave-absorbing main body 200. The wave-absorbing main body 200 is arranged on the base body 100. If the wave absorber unit 10 is used in an absorber chamber, electromagnetic waves are processed mainly by the wave-absorbing main body 200; that is, the reflection and absorption of electromagnetic waves are mainly carried out by the wave-absorbing main body 200.The cross-sectional area of ​​the wave-absorbing main body 200 gradually decreases from bottom to top, and the wave-absorbing main body 200 has a first cross-section and a second cross-section in a horizontal direction, the first cross-section being located above the second cross-section, and the first cross-section and the second cross-section having similar polygonal shapes; and in the horizontal direction the first cross-section is rotated by a predetermined angle relative to the second cross-section. The first and second cross-sections can be any two cross-sections of the wave-absorbing main body 200, as long as the first cross-section lies above the second cross-section. Furthermore, the specified angle by which the first cross-section is rotated relative to the second cross-section may differ depending on the chosen first and second cross-sections. For example, the specified angle is smaller if the first cross-section is closer to the second cross-section; however, if the first cross-section is farther away from the second cross-section, the specified angle is larger.Furthermore, the expression "the first cross-section and the second cross-section have similar polygonal shapes" means that, firstly, both the first cross-section and the second cross-section have polygonal shapes; and secondly, the shape of the first cross-section and the shape of the second cross-section are similar graphics. For example, if the first cross-section is a regular hexagon, the second cross-section is also a regular hexagon; and if the first cross-section is a regular quadrilateral, the second cross-section is also a regular quadrilateral. The expression "in the horizontal direction, the first cross-section is rotated by a predetermined angle relative to the second cross-section" means that, taking the structure of a regular truncated pyramid as a reference, two superimposed cross-sections are formed on it, and the upper cross-section is rotated in the horizontal direction by a predetermined angle relative to the other, whereby the cross-section formed by the upper cross-section after 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 wave-absorbing main body 200 is represented in a conical or frustoconical structure in a twisted form, as shown in Fig. 1. It is worth mentioning that it is also possible to configure part of the structure of the wave-absorbing main body 200 as the truncated cone structure described above in a twisted form, and at the same time to configure the other part of the structure as a regular truncated pyramid structure. As described above, in this wave absorber unit 10, the wave-absorbing main body 200 is depicted in a state where the upper part is smaller and the lower part is larger, and the upper first cross-section is rotated relative to the lower second cross-section. This means that the wave-absorbing main body 200 is represented, at least partially, as a pattern formed by a twisted pyramid. This allows the number of reflections of electromagnetic waves in the periodic structure of the wave-absorbing main body 200 to be increased, the reflection path to be lengthened, the operating frequency range to be extended, and the ability of the wave-absorbing main body 200 to absorb low-frequency electromagnetic waves to be improved.Based on this, this wave absorber unit 10 can mitigate the problem present in the prior art that it is difficult for wave-absorbing materials to effectively reflect and absorb electromagnetic waves with a frequency of less than 1 GHz multiple times, which leads to a deterioration of the behavior of wave-absorbing materials and makes it difficult to meet the requirements of certain scenarios. Furthermore, in this embodiment, the specified angle is directly proportional to the distance between the first and second cross-sections. It can also be interpreted as the wave-absorbing main body 200 being rotated by uniform turning. This is advantageous for achieving a standardized shape and structure of the wave-absorbing main body 200, thereby reducing the machining difficulty and costs. In other embodiments, the angle of rotation of the wave-absorbing main body 200 can of course also be configured in an irregular way, as long as it can adapt to actual requirements. In this embodiment, the first cross-section is the top surface of the wave-absorbing main body 200, and the second cross-section is the base surface of the wave-absorbing main body 200; and the specified angle lies in the range of 30°–70°. When the first cross-section is the top surface of the wave-absorbing main body 200 and the second cross-section is the base surface of the wave-absorbing main body 200, the largest angle by which the two cross-sections of the wave-absorbing main body 200 are rotated relative to each other is obtained. Investigations show that, based on the above, if the specified angle lies in the range of 30°–70°, the specified angle is directly proportional to the wave absorption performance of the wave-absorbing main body 200.If the specified angle is too small, the absorption performance of the wave-absorbing main body 200 differs little from the wave absorption performance of a conventional regular obtuse wave absorber element; if the specified angle is too large, the wave absorption performance is not significantly improved, but the production difficulty increases and the applicability decreases. Therefore, the range of values ​​for the specified angle is preferably set to 30°–70°. In other words, the specified 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., if the first cross-section is the top surface of the wave-absorbing main body 200 and the second cross-section is the base surface of the wave-absorbing The main body is 200. In this embodiment, the first and second cross-sections are preferably hexagonal or quadrilateral; more preferably, the first and second cross-sections are in the shape of a regular hexagon or a regular quadrilateral. With the hexagonal or quadrilateral first and second cross-sections, the wave-absorbing main body 200 exhibits excellent wave absorption performance, and the manufacturing difficulty of the wave-absorbing main body 200 is low. It is understood that in other embodiments, the first and second cross-sections can also be provided in a different shape, e.g., in the shape of a triangle, a pentagon, or an octagon. Furthermore, in this embodiment, the connecting line between the center of the first cross-section and the center of the second cross-section is perpendicular to both the first and second cross-sections. It can also be interpreted that the wave-absorbing main body 200 is formed by twisting a regular truncated pyramid; and when viewing the wave-absorbing main body 200 from a top-down perspective, the top surface represents the central position of the entire shape, as shown in Fig. 2. If, in other embodiments, an angle other than 90° is formed between the connecting line described above and the first or second cross-section, it can, of course, be interpreted that the wave-absorbing main body 200 is formed by twisting a structure of an obliquely angled truncated pyramid. Alternatively, in this embodiment, 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. The term "and / or" means that it is possible for the first cross-section to be rotated only clockwise relative to the second cross-section, i.e., the direction of rotation of the entire wave-absorbing main body 200 remains unchanged; it is also possible for the first cross-section to be rotated only counterclockwise relative to the second cross-section, i.e., the direction of rotation of the entire wave-absorbing main body 200 remains unchanged; and it is also possible for part of the first cross-section to be rotated clockwise relative to the second cross-section, while part of the first cross-section is rotated counterclockwise relative to the second cross-section., part of the structure of the wave-absorbing main body 200 is twisted clockwise, while the other part of the structure is twisted counterclockwise. Taking into account the production difficulties, the wave-absorbing main body 200 in this embodiment is of course preferably twisted in the same direction, e.g. the wave-absorbing main body 200 as shown in Fig. 1. In this embodiment, the base body 100 is prismatic; and the cross-sectional shape of the base 100 is a polygon similar to the first cross-section. The base surface of the wave-absorbing main body 200 is identical to the cross-section of the base body 100, and several edges of the base surface of the wave-absorbing main body 200 coincide with the top surface of the base body 100. Based on the wave absorber unit 10 provided above, an embodiment of this disclosure also provides a wave absorber structure 11 in which the wave absorber unit 10 described above is used. In a wave absorber structure 11, as shown in Fig. 3, the wave absorber structure 11 comprises at least two wave absorber units 10 as described above, wherein adjacent base bodies 100 are connected to one another, and in two adjacent wave-absorbing main bodies 200, the first cross-sections are each rotated in the same direction relative to the corresponding second cross-section. That is, in adjacent wave-absorbing main bodies 200, the first cross-section of one of the wave-absorbing main bodies 200 is configured such that it is rotated clockwise relative to the second cross-section, and the first cross-section in the other wave-absorbing main body 200 is also configured such that it is rotated clockwise relative to the second cross-section. In another wave absorber structure 11, as shown in Fig. 4, the wave absorber structure 11 comprises at least two wave absorber units 10 as described above, wherein adjacent base bodies 100 are connected to one another, and in two adjacent wave-absorbing main bodies 200, the first cross-sections are each rotated in opposite directions relative to the corresponding second cross-section. This means that the wave absorber structure 11 has at least two adjacent wave absorber units 10 in which opposite directions of rotation are realized. In yet another wave absorber structure 11, as shown in Fig. 5-7, the wave absorber structure 11 comprises a regular pyramid unit 12 and a wave absorber unit 10 as described above; the regular pyramid unit 12 comprises a base 121 and a wave-absorbing section 122 arranged on the base 121, the base 121 being columnar, and the wave-absorbing section 122 being either a regular truncated pyramid or a regular pyramid; and one of the base bodies 100 abuts and is connected to at least one of the bases 121. This means that the twisted wave-absorbing main body 200 and the regular pyramid unit 12 in the form of a regular truncated pyramid are used in combination with one another and are alternately connected to one another. Based on the wave absorber unit 10 or wave absorber structure 11 provided above, the present disclosure also provides comparative tests of several structures. The test structures used include: Control group 1: A wave absorber structure 11 is used, consisting of several regular pyramid units 12. The regular pyramid unit 12 has a base 121 in the form of a regular square prism and a wave-absorbing section 122 in the form of a regular square truncated pyramid. The total height of the regular pyramid unit 12 is 300 mm, the height of the base 121 is 65 mm, and the side length is 45 mm. Control group 2: A wave absorber structure 11 is used, consisting of several regular pyramid units 12. The regular pyramid unit 12 has a base 121 in the form of a regular hexagonal prism and a wave-absorbing section 122 in the form of a regular hexagonal truncated pyramid.The overall height of the regular pyramid unit 12 is 300 mm, the height of the base 121 is 65 mm, and the side length is 45 mm. Experimental group 1: A wave absorber structure 11 is used, which consists of several wave absorber units 10. The base body 100 of the wave absorber unit 10 is a regular quadrilateral prism, the first and second cross-sections of the wave-absorbing main body 200 are regular quadrilaterals, and the top surface of the wave-absorbing main body 200 is rotated by a predetermined angle of 70° relative to the base surface of the wave-absorbing main body 200. The total height of the wave absorber unit 10 is 300 mm, the height of the base body 100 is 65 mm, and the side length is 45 mm. Experimental group 2: A wave absorber structure 11 is used, which consists of several wave absorber units 10.The base body 100 of the wave absorber unit 10 is a regular hexagonal prism. The first and second cross-sections of the wave-absorbing main body 200 are regular hexagons, and the top surface of the wave-absorbing main body 200 is rotated by a predetermined angle of 70° relative to the base surface of the wave-absorbing main body 200. The overall height of the wave absorber unit 10 is 300 mm, the height of the base body 100 is 65 mm, and the side length is 45 mm. Experimental group 3: A wave absorber structure 11 is used, consisting of several wave absorber units 10 and several regular pyramid units 12.The shape and dimensions of the wave absorber unit 10 are identical to the shape and dimensions of the wave absorber unit 10 in experimental group 2; and the shape and dimensions of the regular pyramid unit 12 are identical to the shape and dimensions of the regular pyramid unit 12 in control group 2. Experimental group 4: A wave absorber structure 11 is used, consisting of several wave absorber units 10 and several regular pyramid units 12.The shape of wave absorber unit 10 is identical to the shape of wave absorber unit 10 in experimental group 2, the dimensions are as follows: the overall height is 300 mm, the height of the base body 100 is 65 mm, and the side length is 75 mm; and the shape of regular pyramid unit 12 is identical to the shape of regular pyramid unit 12 in control group 2, and the dimensions are as follows: the overall height is 300 mm, the height of the base 121 is 65 mm, and the side length is 75 mm. Using the respective control and experimental groups described above, tests are conducted in electromagnetic wave environments with different frequency bands, and reference is made to Fig. 8 and the following table (where in Fig. 8 the abscissa denotes the frequency and the ordinate denotes the absorption rate). It should be noted that Fig. 8 and the following table illustrate the absorption powers at perpendicular incidence (i.e., at an angle of incidence of 0°). Control group 1 - 35.0 dB - 31.6 dB - 32.5 dB - 40.0 dB - 48.9 dB - 58.8 dB - 51.2 dB - 48.9 dB Control group 2 - 23.1 dB - 45.0 dB - 30.4 dB - 46.1 dB - 37.0 dB - 45.6 dB - 44.4 dB - 44.8 dB Experimental group 1-36.2dB-31.1dB-32.9dB-40.7dB-39.1dB-46.7dB-46.9dB-48.9dB Experimental group 2-22.1dB-47.3dB-30.8dB-48.1dB-45.5dB-45.9dB-44.3dB-44.8dB Experimentalgruppe 3-22,5 dB-46,1 dB-30,7 dB-46,9 dB-43,2 dB-46,7 dB-44,7 dB-45,0 dB Experimentalgruppe 4-24,7 dB-43,4 dB-41,2 dB-48,8 dB-52,4 dB-54,2 dB-52,0 dB-50,5 dB It is evident that, compared to the control groups, the absorption performance of the respective experimental groups is improved. Experimental group 2 shows an improvement in absorption performance of approximately 2-3 dB in some frequency bands compared to control group 2, with a particular improvement of up to 8.5 dB at the 1.3 GHz frequency point. Compared to control group 1, the most common control group in the prior art, experimental group 2 also shows a significant improvement in absorption performance in some frequency bands. Furthermore, compared to control group 1, the resonance peak in experimental group 2 shifts to the left, thus reducing the frequency point with an absorption performance of -30 dB. At approximately 0.5 GHz, the absorption performance of experimental group 3 reaches -30 dB and remains essentially below -40 dB after reaching 1 GHz.Thanks to the increase in height to 450 mm, the performance of experimental group 4 is further significantly improved and the frequency point with an absorption power of -30 dB is reduced to 0.4 GHz. Furthermore, the absorption coefficients at different angles of incidence (0°, 20°, 30°, 40°) in the frequency band of 0-2 GHz are compared based on control group 1 and experimental group 3, reference to Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. 13. It is evident that, compared with control group 1, experimental group 3 exhibits a slight reduction in absorption coefficient at high frequencies (above 1 GHz), but at several angles of incidence, the resonance peak shifts to the left, thereby achieving an absorption coefficient of -30 dB at the lower frequency point. In other words, in experimental group 3, the absorption coefficient at several angles of incidence at low frequencies (below 1 GHz) is, in a sense, improved. In summary, in the wave absorber unit 10 and the wave absorber structure 11 provided in the embodiments, the wave-absorbing main body 200 is depicted in a state where the upper part is smaller and the lower part is larger, and the upper first cross-section is rotated relative to the lower second cross-section. This means that the wave-absorbing main body 200 is represented, at least partially, as a pattern formed by a twisted pyramid. This allows the number of reflections of electromagnetic waves in the periodic structure of the wave-absorbing main body 200 to be increased, the reflection path to be lengthened, the operating frequency range to be extended, and the ability of the wave-absorbing main body 200 to absorb low-frequency electromagnetic waves to be improved.Based on this, this wave absorber unit 10 can mitigate the problem present in the prior art that it is difficult for wave-absorbing materials to effectively reflect and absorb electromagnetic waves with a frequency of less than 1 GHz multiple times, which leads to a deterioration of the behavior of wave-absorbing materials and makes it difficult to meet the requirements of certain scenarios. The above are only specific embodiments of the present disclosure; however, the scope of protection of this disclosure is not limited thereto. Modifications or substitutions that are readily conceivable to a person skilled in the art within the scope of this disclosure should fall within its scope of protection. Therefore, the scope of protection of this disclosure is to be defined by the scope of protection of the claims. The present disclosure provides a wave absorber unit and a wave absorber structure, and relates to the technical field of electromagnetic wave-absorbing materials. This wave absorber unit comprises a base body and a wave-absorbing main body. The wave-absorbing main body is arranged on the base body; the cross-sectional area of ​​the wave-absorbing main body decreases gradually from bottom to top, and the wave-absorbing main body has a first cross-section and a second cross-section in a horizontal direction, the first cross-section being located above the second cross-section, and the first cross-section and the second cross-section having similar polygonal shapes; and in the horizontal direction, the first cross-section is rotated by a predetermined angle relative to the second cross-section.The wave absorber structure provided in this disclosure utilizes the wave absorber unit described above. The wave absorber unit and the wave absorber structure provided in this disclosure can mitigate the prior art technical problem that electromagnetic waves cannot be effectively reflected and absorbed multiple times, which leads to a deterioration in the performance of wave-absorbing materials and makes it difficult to meet the requirements of certain scenarios.

Claims

Wave absorber unit, characterized in that it comprises: a base body; and a wave-absorbing main body arranged on the base body; wherein the cross-sectional area of ​​the wave-absorbing main body gradually decreases from bottom to top, and the wave-absorbing main body has a first cross-section and a second cross-section in a horizontal direction, wherein the first cross-section lies above the second cross-section, and the first cross-section and the second cross-section have similar polygonal shapes; and wherein, in the horizontal direction, the first cross-section is rotated by a predetermined angle relative to the second cross-section. Wave absorber unit according to claim 1, characterized in that the predetermined angle is in direct proportion to the distance between the first cross-section and the second cross-section. Wave absorber unit according to claim 1, characterized in that the first cross-section is the top surface of the wave-absorbing main body, and the second cross-section is the base surface of the wave-absorbing main body; and the predetermined angle is in the range of 30°-70°. Wave absorber unit according to claim 1, characterized in that the first cross-section and the second cross-section are hexagonal or square. Wave absorber unit according to claim 1, characterized in that the connecting line between 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. Wave absorber unit according to claim 1, characterized in that 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. Wave absorber unit according to claim 1, characterized in that the base body is prismatic; and the cross-sectional shape of the base body is a polygon similar to the first cross-section. Wave absorber structure, characterized in that it comprises at least two wave absorber units according to one of claims 1 to 7, wherein adjacent base bodies are connected to each other, and in two adjacent wave-absorbing main bodies, the first cross-sections are each rotated in the same direction relative to the corresponding second cross-section. Wave absorber structure, characterized in that it comprises at least two wave absorber units according to one of claims 1 to 7, wherein adjacent base bodies are connected to each other, and in two adjacent wave-absorbing main bodies, the first cross-sections are each rotated in opposite directions relative to the corresponding second cross-section. Wave absorber structure, characterized in that it comprises a regular pyramid unit and a wave absorber unit according to one of claims 1 to 7; wherein the regular pyramid unit comprises a base and a wave-absorbing section arranged on the base, the base being columnar, and the wave-absorbing section being either a regular truncated pyramid or a regular pyramid; and one of the base bodies adjoins and is connected to at least one of the bases.

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