CN113540820B - A stepped cylindrical resonant structure and an absorber for multi-frequency electromagnetic waves - Google Patents
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及电磁波吸收技术领域，特别是涉及一种阶梯筒状谐振结构及多频电磁波的吸收体。The invention relates to the technical field of electromagnetic wave absorption, in particular to a stepped cylindrical resonant structure and an absorber for multi-frequency electromagnetic waves.
背景技术Background technique
超材料作为一种人工设计的复合材料，由于独特的物理性质引起了学界的高度重视。以超材料作为吸波体，具有设计灵活、响应可调和厚度薄的优点。此外，超材料吸波体可以实现超宽带和极窄带宽，广泛应用于隐身材料、太赫兹成像、生物医学、智能通信以及光电探测等领域。近年来，研究人员在多频段超材料吸波体方向进行了大量研究，但目前的多频段超材料吸波体对于大角度入射的电磁波的吸收率很低，大大限制了吸波体的应用。Metamaterials, as a kind of artificially designed composite materials, have attracted great attention in the academic circle due to their unique physical properties. Using metamaterials as absorbers has the advantages of flexible design, adjustable response and thin thickness. In addition, metamaterial absorbers can achieve ultra-broadband and extremely narrow bandwidth, and are widely used in stealth materials, terahertz imaging, biomedicine, intelligent communication, and photoelectric detection. In recent years, researchers have conducted a lot of research in the direction of multi-band metamaterial absorbers, but the current multi-band metamaterial absorbers have a low absorption rate for large-angle incident electromagnetic waves, which greatly limits the application of absorbers.
发明内容Contents of the invention
本发明的目的是提供一种阶梯筒状谐振结构及多频电磁波的吸收体，能够提高大角度入射电磁波的吸收效率。The purpose of the present invention is to provide a stepped cylindrical resonant structure and an absorber for multi-frequency electromagnetic waves, which can improve the absorption efficiency of large-angle incident electromagnetic waves.
为实现上述目的，本发明提供了如下方案：To achieve the above object, the present invention provides the following scheme:
一种阶梯筒状谐振结构，包括：A stepped cylindrical resonant structure, comprising:
多个圆筒结构；Multiple cylinder structures;
多个所述圆筒结构的圆同轴设置于同一平面上，多个所述圆筒结构的半径由内到外依次增大；多个所述圆筒结构的高度由内到外依次降低。The circles of the multiple cylindrical structures are coaxially arranged on the same plane, and the radii of the multiple cylindrical structures increase sequentially from inside to outside; the heights of the multiple cylindrical structures decrease sequentially from inside to outside.
可选的，任意两个相邻圆筒结构的高度差相等；任意两个相邻圆筒结构的半径差相等。Optionally, the height difference between any two adjacent cylindrical structures is equal; the radius difference between any two adjacent cylindrical structures is equal.
可选的，多个所述圆筒结构的厚度均相等。Optionally, the plurality of cylindrical structures have the same thickness.
一种多频电磁波的吸收体，所述吸波体，包括：An absorber for multi-frequency electromagnetic waves, the absorber includes:
多个吸收单元；multiple absorption units;
多个所述吸收单元的结构和尺寸均相同；多个所述吸收单元呈周期性连续排列；The structures and sizes of the plurality of absorption units are the same; the plurality of absorption units are periodically and continuously arranged;
所述吸收单元具体包括：The absorption unit specifically includes:
介质基板和上述的阶梯筒状谐振结构；A dielectric substrate and the above-mentioned stepped cylindrical resonant structure;
所述阶梯筒状谐振结构嵌设于所述介质基板内。The stepped cylindrical resonant structure is embedded in the dielectric substrate.
可选的，所述介质基板的底部覆盖有金属膜。Optionally, the bottom of the dielectric substrate is covered with a metal film.
可选的，所述金属膜的材料为铜。Optionally, the material of the metal film is copper.
可选的，所述介质基板的材料为光敏树脂。Optionally, the material of the dielectric substrate is photosensitive resin.
可选的，所述阶梯筒状谐振结构的材料为导电银浆。Optionally, the material of the stepped cylindrical resonant structure is conductive silver paste.
根据本发明提供的具体实施例，本发明公开了以下技术效果：According to the specific embodiments provided by the invention, the invention discloses the following technical effects:
本发明提供了一种阶梯筒状谐振结构及多频电磁波的吸收体，阶梯筒状谐振结构包括：多个圆筒结构；多个所述圆筒结构的圆同轴设置于同一平面上，多个所述圆筒结构的半径由内到外依次增大；多个所述圆筒结构的高度由内到外依次降低。本发明提供的阶梯筒状谐振结构，增大了电磁波的吸收面积，提高大角度入射电磁波的吸收效率。The invention provides a stepped cylindrical resonant structure and an absorber for multi-frequency electromagnetic waves. The stepped cylindrical resonant structure includes: multiple cylindrical structures; the circles of multiple cylindrical structures are coaxially arranged on the same plane, and multiple The radius of each cylindrical structure increases sequentially from inside to outside; the heights of multiple cylindrical structures decrease sequentially from inside to outside. The stepped cylindrical resonant structure provided by the invention increases the absorption area of electromagnetic waves and improves the absorption efficiency of large-angle incident electromagnetic waves.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.
图1为本发明实施例中阶梯筒状谐振结构示意图；Fig. 1 is a schematic diagram of a stepped cylindrical resonant structure in an embodiment of the present invention;
图2为本发明实施例中吸收单元的结构示意图；Fig. 2 is the structural representation of absorption unit in the embodiment of the present invention;
图3为本发明实施例中吸收单元的俯视图；Fig. 3 is the top view of the absorption unit in the embodiment of the present invention;
图4为本发明实施例中吸收单元的剖面图；Fig. 4 is the sectional view of absorption unit in the embodiment of the present invention;
图5为本发明实施例中多频电磁波的吸收体的垂直入射吸收率仿真结果图；Fig. 5 is the simulation result diagram of the vertical incidence absorptivity of the absorber of the multi-frequency electromagnetic wave in the embodiment of the present invention;
图6为本发明实施例中在TE(Transverse Electric，横向电)极化波的不同极化角的电磁波吸收率对比图；6 is a comparison diagram of electromagnetic wave absorption rates at different polarization angles of TE (Transverse Electric) polarized waves in an embodiment of the present invention;
图7为本发明实施例中在TE极化波下斜入射角θ＝15°时的吸收率仿真结果图；Fig. 7 is a diagram of the simulation results of the absorption rate under the oblique incidence angle θ=15° under the TE polarized wave in the embodiment of the present invention;
图8为本发明实施例中在TE极化波下斜入射角θ＝30°时的吸收率仿真结果图；Fig. 8 is a diagram of the simulation result of absorption rate under the oblique incidence angle θ=30° under the TE polarized wave in the embodiment of the present invention;
图9为本发明实施例中在TE极化波下斜入射角θ＝45°时的吸收率仿真结果图；Fig. 9 is a diagram of the simulation results of the absorption rate under the oblique incidence angle θ=45° under the TE polarized wave in the embodiment of the present invention;
图10为本发明实施例中在TE极化波下斜入射角15°-45°时的吸收率对比图；Fig. 10 is a comparison diagram of absorption rate at an oblique incidence angle of 15°-45° under TE polarized waves in an embodiment of the present invention;
附图说明：1-介质基板；2-阶梯筒状谐振结构；3-金属膜。Description of the drawings: 1-dielectric substrate; 2-ladder cylindrical resonant structure; 3-metal film.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明的目的是提供一种阶梯筒状谐振结构及多频电磁波的吸收体，能够提高大角度入射电磁波的吸收效率。The purpose of the present invention is to provide a stepped cylindrical resonant structure and an absorber for multi-frequency electromagnetic waves, which can improve the absorption efficiency of large-angle incident electromagnetic waves.
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
图1为本发明实施例中阶梯筒状谐振结构示意图，如图1所示，本发明提供了一种阶梯筒状谐振结构，包括：Fig. 1 is a schematic diagram of a stepped cylindrical resonant structure in an embodiment of the present invention. As shown in Fig. 1, the present invention provides a stepped cylindrical resonant structure, including:
多个圆筒结构；多个圆筒结构的圆同轴设置于同一平面上，多个圆筒结构的半径由内到外依次增大；多个圆筒结构的高度由内到外依次降低。Multiple cylindrical structures; the circles of the multiple cylindrical structures are coaxially arranged on the same plane, the radii of the multiple cylindrical structures increase sequentially from inside to outside; the heights of the multiple cylindrical structures decrease sequentially from inside to outside.
具体的，任意两个相邻圆筒结构的高度差相等；任意两个相邻圆筒结构的半径差相等。Specifically, the height difference between any two adjacent cylindrical structures is equal; the radius difference between any two adjacent cylindrical structures is equal.
多个圆筒结构的厚度均相等。The thicknesses of the plurality of cylindrical structures are all equal.
图2为本发明实施例中吸收单元的结构示意图；图3为本发明实施例中吸收单元的俯视图；图4为本发明实施例中吸收单元的剖面图；如图2-3所示，本发明还一种多频电磁波的吸收体，包括：Fig. 2 is a schematic structural view of the absorption unit in the embodiment of the present invention; Fig. 3 is a top view of the absorption unit in the embodiment of the present invention; Fig. 4 is a cross-sectional view of the absorption unit in the embodiment of the present invention; as shown in Fig. 2-3, the present invention Invention is also an absorber for multi-frequency electromagnetic waves, including:
多个吸收单元；multiple absorption units;
多个吸收单元的结构和尺寸均相同；多个吸收单元呈周期性连续排列；The structure and size of multiple absorption units are the same; multiple absorption units are arranged periodically and continuously;
吸收单元具体包括：The absorption unit specifically includes:
介质基板1和上述阶梯筒状谐振结构2；A dielectric substrate 1 and the above-mentioned stepped cylindrical resonant structure 2;
阶梯筒状谐振结构2嵌设于介质基板1内。The stepped cylindrical resonant structure 2 is embedded in the dielectric substrate 1 .
具体的，介质基板的底面为正方形，厚度为H＝1.75mm，正方形边长为a＝5mm；阶梯筒状谐振结构层包括7个同心圆筒，圆筒厚度为d＝0.05mm，相邻圆筒的内径差均为r＝0.3mm，相邻圆筒的高度差为h＝0.2mm，最靠近圆心的圆筒内径为r1＝0.25mm，高度为h1＝1.4mm，最靠近圆心的圆筒顶面到介质基板上表面的距离L1＝0.1mm；圆筒底面到介质基板下表面的距离L2＝0.25mm。Specifically, the bottom surface of the dielectric substrate is a square, the thickness of which is H=1.75mm, and the side length of the square is a=5mm; the stepped cylindrical resonance structure layer includes 7 concentric cylinders, the thickness of which is d=0.05mm, and the adjacent circle The inner diameter difference of the cylinders is r=0.3mm, the height difference of adjacent cylinders is h=0.2mm, the inner diameter of the cylinder closest to the center of the circle is r1=0.25mm, and the height is h1=1.4mm, the cylinder closest to the center of the circle is The distance L1 from the top surface to the upper surface of the dielectric substrate = 0.1 mm; the distance L2 from the bottom surface of the cylinder to the lower surface of the dielectric substrate = 0.25 mm.
此外，本发明提供的的多频电磁波的吸收体，介质基板1的底部覆盖有金属膜3。In addition, in the multi-frequency electromagnetic wave absorber provided by the present invention, the bottom of the dielectric substrate 1 is covered with a
具体的，金属膜的材料为铜。Specifically, the material of the metal film is copper.
介质基板的材料为光敏树脂；介电常数为2.9，损耗角正切值为0.02。The material of the dielectric substrate is photosensitive resin; the dielectric constant is 2.9, and the loss tangent value is 0.02.
阶梯筒状谐振结构的材料为导电银浆；导电系数为5.88×105s/m。The material of the stepped cylindrical resonant structure is conductive silver paste; the conductivity is 5.88×105 s/m.
图5为本发明实施例中多频电磁波的吸收体的垂直入射吸收率仿真结果图；如图5所示，本发明提供的吸收体在12.84GHZ、15.44GHZ和18.68GHZ处产生三个谐振频点，三处的吸收率均达到95％以上。Fig. 5 is the vertical incidence absorptivity simulation result figure of the absorber of multi-frequency electromagnetic wave in the embodiment of the present invention; As shown in Fig. 5, the absorber provided by the present invention produces three resonance frequencies at 12.84GHZ, 15.44GHZ and 18.68GHZ point, the absorption rate of the three places all reached more than 95%.
图6为本发明实施例中在TE极化波的不同极化角的电磁波吸收率对比图。如图6所示，本发明提供的吸波体对于不同极化角下入射的电磁波的吸波率曲线一致，因此，本发明提供的吸波体具有极化不敏感特性。FIG. 6 is a comparison diagram of electromagnetic wave absorption rates at different polarization angles of TE polarized waves in an embodiment of the present invention. As shown in FIG. 6 , the absorption rate curves of the absorber provided by the present invention are consistent with respect to incident electromagnetic waves at different polarization angles. Therefore, the absorber provided by the present invention has polarization-insensitive characteristics.
图7为本发明实施例中在TE极化波下斜入射角θ＝15°时的吸收率仿真结果图。图8为本发明实施例中在TE极化波下斜入射角θ＝30°时的吸收率仿真结果图图9为本发明实施例中在TE极化波下斜入射角θ＝45°时的吸收率仿真结果图图10为本发明实施例中在TE极化波下斜入射角15°-45°时的吸收率对比图；其中，图5-10中的横坐标均为电磁波频率，纵坐标均为电磁波吸收率；如图7-10所示，本发明提供的吸波体在大入射角下也有很高的吸收率，在45°斜入射角下三个谐振峰的吸收均达到90％，且吸收频率随入射角度变化很小，具有优良的频率稳定性。Fig. 7 is a diagram of simulation results of absorption rate under oblique incidence angle θ=15° under TE polarized waves in an embodiment of the present invention. Fig. 8 is the simulation result of absorption rate when the oblique incidence angle θ=30° of the TE polarized wave in the embodiment of the present invention Fig. 9 is the oblique incidence angle θ=45° of the TE polarized wave in the embodiment of the present invention Figure 10 is a comparison chart of absorption rate simulation results of TE polarized waves in an embodiment of the present invention at an oblique incidence angle of 15°-45°; wherein, the abscissas in Figures 5-10 are electromagnetic wave frequencies, The ordinate is the electromagnetic wave absorption rate; as shown in Figure 7-10, the absorber provided by the present invention also has a high absorption rate at a large incident angle, and the absorption of the three resonance peaks at an oblique incident angle of 45° all reaches 90%, and the absorption frequency changes little with the incident angle, and has excellent frequency stability.
本发明提出的阶梯筒状谐振结构及多频电磁波的吸收体具有高度对称性，因此具有极化不敏感特性，能够吸收不同极化类型的电磁波以及以不同极化角度入射的电磁波，对于在大入射角下也有很高的吸收率，本发明的吸收率几乎不受电磁波入射角度的影响，具有优良的频率稳定性。The stepped cylindrical resonant structure and the absorber of multi-frequency electromagnetic waves proposed by the present invention have high symmetry, so they have the characteristics of polarization insensitivity, and can absorb electromagnetic waves of different polarization types and incident electromagnetic waves at different polarization angles. It also has a high absorption rate under the incident angle, and the absorption rate of the invention is hardly affected by the incident angle of electromagnetic waves, and has excellent frequency stability.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的系统而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.
本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处。综上所述，本说明书内容不应理解为对本发明的限制。In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.
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