A truncated pyramid wave absorbing structure for limited space

Abstract

The utility model provides a truncated pyramid wave absorbing structure for use in a limited space, comprising a plurality of truncated pyramid wave absorbing corners, wherein the truncated pyramid wave absorbing corners comprise a spherical structure and a quadrangular pyramid, wherein the spherical structure is fixed to the top of the quadrangular pyramid, wherein the plurality of truncated pyramid wave absorbing corners are fixed to a flat plate structure through the bottom of the quadrangular pyramid, wherein the flat plate structure resistance is less than the quadrangular pyramid resistance and less than the spherical structure resistance. The utility model truncated pyramid wave absorbing structure for use in a limited space is suitable for use in a compact space, and has better absorption performance than traditional truncated pyramid wave absorbing materials, and also has the advantages of being wear-resistant and not easily damaged by collision due to the spherical design of the top.

Description

Technical Field

[0001] The utility model relates to wave absorbing material technology, in particular to a truncated pyramid wave absorbing structure used in a limited space. Background Art

[0002] For absorbing materials used in limited spaces, considering the limited space of the anechoic chamber or the easy collision and wear of the door area of ​​the anechoic chamber, the pyramid generally cuts off the top of the pyramid-shaped absorbing material. The truncated pyramids are mostly truncated pyramids with a flat top. However, since the top of this type of absorbing material forms a flat surface after truncation, the incident electromagnetic wave will generate a large emission, causing the absorbing performance of the pyramid to drop sharply. Moreover, in the anechoic chamber, especially at the door, it is easy to be affected by external forces, wear and deformation.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a truncated wave-absorbing pyramid suitable for use in a limited space, so as to overcome the problems existing in the prior art. Utility Model Content

[0004] The utility model aims to solve the problems of top reflection and easy wear and deformation of existing truncated pyramid absorbing materials, and propose a truncated pyramid absorbing structure for use in limited spaces. The absorbing material has both excellent absorbing performance and wear resistance.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a truncated pyramid absorbing structure used in a limited space, including a plurality of truncated pyramids, the truncated pyramids including a spherical structure and a tetrahedron (trapezoidal structure), the spherical structure is fixed on the top of the tetrahedron, the plurality of truncated pyramids are fixed on a flat plate structure through the bottom of the tetrahedron, adjacent truncated pyramids are closely adjacent, and the lower flat plate structure has no exposed white; the flat plate structure resistance is less than the tetrahedron resistance and less than the spherical structure resistance.

[0006] Furthermore, the resistances of the spherical structure, the tetrahedral pyramid and the flat plate structure are 10K ohms, 2-3K ohms and 100-200 ohms respectively. The utility model sets the resistance value according to the air impedance matching principle, the spherical structure is 10 ohms, and the electromagnetic waves are more likely to enter the absorber, thereby increasing the absorbing performance.

[0007] Furthermore, the height ratio of the spherical structure, the tetrahedral pyramid and the flat plate structure is 5-10:50-100:5-10, and the preferred height ratio is 5:50:5.

[0008] Furthermore, the height of the truncated pyramid absorbing structure used in the limited space is 240-600 mm, preferably 400 mm.

[0009] Furthermore, the spherical structure is a hemisphere.

[0010] Furthermore, the spherical structure uses an open-pore polyurethane sponge with a resistance of 10K ohms, which is also called a filter sponge. The spherical structure can reduce wear caused by external forces due to its smooth surface, and can achieve better scattering effect.

[0011] Furthermore, the flat plate structure adopts an open-pore polyurethane sponge with a resistance of 2-3K ohms.

[0012] Furthermore, the flat plate structure adopts an open-pore polyurethane sponge with a resistance of 100-200 ohms.

[0013] Furthermore, the upper spherical structure, the middle tetrahedral pyramid and the lower flat plate structure are bonded together by a conductive pressure-sensitive adhesive having a single-layer resistance of 500 to 1000 ohms. The conductive pressure-sensitive adhesive is a conventional product that can be purchased commercially.

[0014] The utility model has a simple, reasonable and compact truncated pyramid wave absorbing structure for use in limited spaces, and has the following advantages compared with the prior art:

[0015] 1) The utility model is composed of three layers of open-pore polyurethane sponge with a resistance gradient setting. Compared with truncated pyramidal wave absorbing pyramids of the same height, the wave absorbing performance is better and the defect of easy wear of the pyramid is solved;

[0016] 2) The utility model has novel structure, convenient use and good wave-absorbing performance. Its large-scale market launch will surely produce positive social benefits and significant economic benefits.

[0017] 3) In the three-layer structure of the utility model, the upper layer is a spherical structure with a resistance of 10K ohms, the middle layer is a quadrangular pyramid with a resistance of 2-3K ohms, and the lower layer is a flat plate structure with a resistance of 100-200 ohms. The different resistances can form a resistance gradient and achieve broadband absorption.

[0018] 4) The top of the traditional truncated absorbing pyramid material is a flat structure, and part of the topmost flat structure will be reflected back, resulting in a decrease in absorbing performance. The top of the utility model's truncated absorbing pyramid is a spherical structure, which will scatter the incident electromagnetic waves and reflect very few electromagnetic waves. Compared with the design without spherical treatment, this structural design has greatly improved absorbing performance.

[0019] In summary, the truncated pyramid electromagnetic wave absorbing material used in limited space of the utility model comprises an upper spherical structure, a middle tetrahedral pyramid and a lower flat plate structure. The absorbing material of the utility model is suitable for compact space and has better absorption performance than the traditional truncated pyramid absorbing material. At the same time, the spherical design of the top is wear-resistant and not easy to be damaged by collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a truncated pyramid absorbing structure used in a limited space in Example 1;

[0021] Figure 2 Schematic diagram of the truncated pyramid absorbing structure of Example 2. DETAILED DESCRIPTION

[0022] The present invention is further described below with reference to the embodiments:

[0023] Example 1

[0024] This embodiment discloses a truncated pyramid wave absorbing structure for use in a limited space. Figure 1 As shown, it includes a plurality of truncated absorbing corner pyramids, the truncated absorbing corner pyramids include an upper spherical structure 1 and an intermediate tetrahedral pyramid 2, the spherical structure 1 is fixed on the top of the tetrahedral pyramid 2, the plurality of truncated absorbing corner pyramids are fixed on a lower flat plate structure 3 through the bottom of the tetrahedral pyramid 2, adjacent truncated absorbing corner pyramids are closely adjacent to each other, and the lower flat plate structure has no exposed white spots.

[0025] The total height of the truncated pyramid wave absorbing structure used in the limited space of this embodiment is 400 mm, and the spherical structure 1, the quadrangular pyramid 2 and the flat plate structure 3 are all made of commercially available open-pore polyurethane sponges.

[0026] The upper spherical structure 1 is a hemisphere with a height of 30 mm, and a commercially available open-pore polyurethane sponge with a resistance of 10K ohms is selected. The spherical structure can reduce the wear caused by external forces on the one hand, and can also achieve a better wave absorbing effect on the other hand.

[0027] The middle-layer quadrangular platform 2 is a step platform with a height of 300 mm, and a commercially available open-pore polyurethane sponge with a resistance of 2K ohms is selected.

[0028] The lower flat plate structure 3 has a thickness of 70 mm and is made of a commercially available open-pore polyurethane sponge with a resistance of 100 ohms.

[0029] The above-mentioned open-cell polyurethane sponges are conventional products that can be purchased commercially, for example, the SAB series foam absorbing blocks produced by Dalian Dongxin Microwave Absorbing Materials Co., Ltd.

[0030] The upper spherical structure, the middle tetrahedral structure and the lower flat plate structure are bonded together, specifically by a conductive pressure-sensitive adhesive having a single-layer resistance of 500 to 1000 ohms. The conductive pressure-sensitive adhesive can be a conventional commercially available product, or a conductive pressure-sensitive adhesive described in patent CN201811591310.X, a medical conductive pressure-sensitive adhesive and its preparation method.

[0031] The truncated pyramid absorbing structure used in the limited space of this embodiment has three layers of resistance gradient and a spherical structure, which can achieve efficient absorption of electromagnetic waves.

[0032] Comparative Example 1

[0033] Compared with Example 1, the difference in Comparative Example 1 is that the top is a planar structure, and its structure is as follows Figure 2 As shown, part of the topmost planar structure will be reflected back, resulting in a decrease in the wave absorbing performance.

[0034] The vertical incident reflection loss test results of the truncated pyramid absorbing structure used in a limited space in Example 1 and the truncated pyramid absorbing structure in Comparative Example 1 are shown in Table 1. It can be seen that compared with the truncated pyramid absorbing structure in Comparative Example 1, the absorbing performance of Example 1 with a hemispherical top is significantly improved because the incident electromagnetic wave energy is scattered and very few electromagnetic waves are reflected.

[0035] In summary, compared with the design of comparative example 1 without spherical surface treatment, the wave absorbing performance of the structure of embodiment 1 is greatly improved.

[0036] Table 1 Performance comparison of Example 1 and Comparative Example 1

[0037]

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A truncated pyramid absorbing structure for use in a limited space, characterized in that: It comprises a plurality of truncated absorbing angle pyramids, wherein the truncated absorbing angle pyramids comprise a spherical structure and a quadrangular pyramid, wherein the spherical structure is fixed on the top of the quadrangular pyramid, and the plurality of truncated absorbing angle pyramids are fixed on a flat plate structure through the bottom of the quadrangular pyramid, wherein the resistance of the flat plate structure is less than the resistance of the quadrangular pyramid and less than the resistance of the spherical structure.

2. The truncated pyramid absorbing structure for use in a limited space according to claim 1, characterized in that: The resistances of the spherical structure, the tetrahedral pyramid and the flat plate structure are 10K ohms, 2-3K ohms and 100-200 ohms respectively.

3. The truncated pyramid wave absorbing structure for use in a limited space according to claim 1, characterized in that: The height ratio of the spherical structure, the quadrangular pyramid and the flat plate structure is 5-10:50-100:5-10.

4. The truncated pyramid wave absorbing structure for use in a limited space according to claim 1, characterized in that: The height of the truncated pyramid wave absorbing structure used in the limited space is 240-600 mm.

5. The truncated pyramid wave absorbing structure for limited space according to claim 1, characterized in that: The spherical structure is a hemisphere.

6. The truncated pyramid wave absorbing structure for limited space according to claim 1, characterized in that: The spherical structure adopts an open-pore polyurethane sponge with a resistance of 10K ohms.

7. The truncated pyramid wave absorbing structure for use in a limited space according to claim 1, characterized in that: The flat plate structure uses an open-pore polyurethane sponge with a resistance of 2-3K ohms.

8. The truncated pyramid wave absorbing structure for use in a limited space according to claim 1, characterized in that: The flat plate structure adopts an open-pore polyurethane sponge with a resistance of 100-200 ohms.

9. The truncated pyramid wave absorbing structure for limited space according to claim 1, characterized in that: The spherical structure, the quadrangular pyramid and the flat plate structure are glued together.

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