CN114336070A - Miniature broadband metamaterial wave absorber - Google Patents
Miniature broadband metamaterial wave absorber Download PDFInfo
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- CN114336070A CN114336070A CN202111506398.2A CN202111506398A CN114336070A CN 114336070 A CN114336070 A CN 114336070A CN 202111506398 A CN202111506398 A CN 202111506398A CN 114336070 A CN114336070 A CN 114336070A
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 230000000737 periodic effect Effects 0.000 claims abstract description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 47
- 238000010521 absorption reaction Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000000704 physical effect Effects 0.000 description 1
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Abstract
The invention discloses a miniature broadband metamaterial wave absorber, and belongs to the field of electromagnetic metamaterials. The micro broadband metamaterial wave absorber is a periodic structure, and each periodic unit structure comprises a first metal structure layer, a second dielectric layer and a third grounding layer. The metal structure layer is composed of 2 Chinese character 'shan' shaped patches, 2 trapezoidal patches and 1 rectangular connection patch. The bottoms of the two Chinese character 'shan' -shaped patches are respectively connected with the lower bottoms of the trapezoidal patches, and the two Chinese character 'shan' -shaped patches are connected through the rectangular connecting patch, wherein the rectangular connecting patch is positioned in the middle of the top of the Chinese character 'shan' -shaped patch; the metal structure layer is positioned in the middle of the dielectric layer and forms an angle of 45 degrees with the horizontal direction of the dielectric layer; the rectangular patch connects the two Chinese character 'shan' shaped patches to form a metal structure layer, and the structure satisfies central symmetry. The micro broadband metamaterial wave absorber has the characteristics of small volume, wide frequency band, simple structure and excellent wave absorbing performance.
Description
Technical Field
The invention belongs to the field of electromagnetic metamaterials, and particularly relates to a miniature broadband metamaterial wave absorber.
Background
Metamaterials refer to composite materials that have artificially designed structures and exhibit extraordinary physical properties not found in natural materials. "metamaterials" are a new class of materials that have appeared since the 21 st century, which do not exist in nature or are difficult to implement, and which possess special properties that are not possessed by natural materials. Due to the unique electromagnetic characteristics of the electromagnetic metamaterial, the electromagnetic metamaterial is a research hotspot in the fields of physics, materials science and the like. In recent years, with the continuous development of electromagnetic metamaterials, the theoretical research of metamaterials is mature and the application is wider and wider, and the electromagnetic metamaterial covers various fields such as military, industry, life and the like, wherein the metamaterial wave absorber is widely concerned as an important application of the metamaterial in the wave absorbing field.
The traditional metamaterial wave absorber can be divided into a resonant wave absorber and a broadband wave absorber, the wave absorbing mechanism of the resonant wave absorber mainly realizes the absorption of electromagnetic waves through electromagnetic resonance, so the absorption frequency band is usually narrow, and although the dual-frequency and multi-frequency metamaterial wave absorbers can be realized through the resonance principle, the realization of the broadband wave absorber has certain difficulty.
Some methods have been developed to realize broadband wave absorbers, and the common methods are: the unit combination method realizes a single-layer broadband wave absorber; based on a coherent phase elimination method of a multilayer medium, a multilayer wave absorber is realized; broadband wave absorption is realized by loading a concentrated element to enhance loss; the broadband wave absorber realized by the methods has the problems of complex structure, large volume, fine design, high design cost and the like.
In view of the above, further intensive research on a micro broadband metamaterial absorber is urgently needed to solve the above problems.
Disclosure of Invention
In view of the above, the present invention is directed to a micro broadband metamaterial absorber.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a micro broadband metamaterial wave absorber is of a periodic structure and consists of M multiplied by N periodic unit structures;
the periodic unit structure comprises a first metal structure layer, a second dielectric layer and a third grounding layer;
the metal structure layer consists of 2 Chinese character 'shan' shaped patches, 2 trapezoidal patches and 1 rectangular connecting patch;
the rectangular connecting patch connects the 2 Chinese character 'shan' patches through the middle parts of the 2 Chinese character 'shan' patches, and the bottom of the Chinese character 'shan' patch is connected with the lower bottom of the trapezoidal patch;
the metal structure layer is positioned in the middle of the dielectric layer and forms 45 degrees with the horizontal direction of the dielectric layer°。
Preferably, the wave absorbing rate of the micro broadband metamaterial wave absorber reaches 90-99% under the working frequency band of 28-54 GHz.
Preferably, the upper bottom, the lower bottom and the height of the trapezoidal patch are respectively W1-0.2 mm, W2-0.8 mm and L1-0.2 mm.
Preferably, the peak width of the Chinese character 'shan' shaped patch is W3 ═ 0.2 mm; the width between peaks of the Chinese character 'shan' shaped patch is W4 ═ 0.15 mm; the height from the peak bottom to the peak top of the Chinese character 'shan' shaped patch is L2-0.3 mm; the height of the Chinese character 'shan' shaped patch is L3 ═ 0.4 mm.
Preferably, the rectangular connection patch has a length and a width of L4-0.4 mm and W3-0.2 mm, respectively.
Preferably, the thickness of the metal structure layer is 0.035mm, and the thickness of the grounding layer is 0.035 mm.
Preferably, the dielectric layer is FR-4 dielectric, the dielectric constant ∈ 4.3, and the loss tangent is 0.025.
Preferably, the thickness and the side length of the dielectric layer are respectively h-0.8 mm and p-2 mm.
Preferably, the material of the metal structure layer and the ground layer is copper.
Preferably, the length and the width of the ground layer are equal to the length and the width of the dielectric layer, respectively.
The invention has the beneficial effects that: the invention provides a miniature broadband metamaterial wave absorber which comprises a first metal structure layer, a second dielectric layer and a third ground layer, wherein the metal structure layer is formed by respectively connecting the bottoms of two Chinese character 'shan' -shaped patches to the lower bottom of a trapezoidal patch, and then connecting the two Chinese character 'shan' -shaped patches through a rectangular connecting patch, and the rectangular connecting patch is positioned in the middle of the top of the Chinese character 'shan' -shaped patch; the metal structure layer is positioned in the middle of the dielectric layer and forms 45 degrees with the horizontal direction of the dielectric layer°Thereby realizing the wave absorbing effect. The micro broadband metamaterial wave absorber can perfectly absorb vertical incidence waves within the frequency range of 28-54 Ghz, and the highest absorption rate can reach 99.9%; the metamaterial wave absorber can realize wave absorption at a wide incident angle within the frequency range of 28-54 Ghz, and the maximum incident angle can reach 35°Incident angle of 0°～35°Within the range, the wave absorbing rate reaches more than 90 percent.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic three-dimensional structure diagram of a periodic unit structure of a wave absorber of a micro broadband metamaterial in embodiment 1;
FIG. 2 is a front view of a periodic unit structure of a wave absorber of the miniature broadband metamaterial in embodiment 1;
FIG. 3 is a left side view of a periodic unit structure of a wave absorber of the miniature broadband metamaterial in embodiment 1;
FIG. 4 is S obtained by CST simulation of the micro broadband metamaterial absorber in example 111A parameter map;
FIG. 5 is a graph of the absorption rate of a wave-absorbing body of the micro broadband metamaterial in example 1;
FIG. 6 is a structural diagram of a micro broadband metamaterial absorber with a 4 × 4 periodic unit structure in example 2;
FIG. 7 is S obtained by CST simulation of a 4 × 4 periodic cell structure of a micro broadband metamaterial absorber in example 211A parameter map;
FIG. 8 is a graph of the absorptivity of a miniature broadband metamaterial absorber with a 4x4 periodic unit structure in example 2;
fig. 9 is a wave absorption rate simulation result diagram of the micro broadband metamaterial wave absorber with 4x4 periodic unit structures in example 2 under different incident angles;
reference numerals: 1 is a metal structure layer, 2 is a dielectric layer, 3 is a ground layer, 4 is a Chinese character 'shan' shaped patch, 5 is a trapezoidal patch, and 6 is a rectangular connection patch.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Example 1
A micro broadband metamaterial wave absorber is of a periodic structure, and each wave absorber periodic unit structure comprises a three-layer structure including a first metal structure layer 1, a second dielectric layer 2 and a third ground layer 3 (shown in figure 1). A grounding layer 3 with the thickness of 0.035 mm; the thickness and the side length of the dielectric layer 2 are respectively h ═ 0.8mm (shown in fig. 2) and p ═ 2mm (shown in fig. 3); the metal structure layer 1 consists of a Chinese character 'shan' shaped patch 4 with the thickness of 0.035mm, a trapezoid patch 5 and a rectangular connecting patch 6;
the bottom of the Chinese character 'shan' shaped patch 4 is connected with the lower bottom of the trapezoid patch 5, the Chinese character 'shan' shaped patch 4 is connected through the rectangular connecting patch 6, and the rectangular connecting patch 6 is positioned in the middle of the top of the Chinese character 'shan' shaped patch 4; the metal structure layer 1 is laid in the middle of the dielectric layer 2 and forms 45 degrees with the horizontal direction of the dielectric layer 2°. The upper bottom, the lower bottom and the height of the trapezoidal patch 5 are respectively W1-0.2 mm, W2-0.8 mm and L1-0.2 mm; the width of the peak of the patch 4 is W3 ═ 0.2mm, the width between the peaks of the patch 4 is 0.15mm, the height from the peak bottom to the peak top of the patch 4 is L2 ═ 0.3mm, and the height of the patch 4 is L3 ═ 0.4 mm; the rectangular attachment patch 6 has a length and width of 0.4mm L4 and 0.2mm W3 (fig. 3).
The dielectric layer 2 is an FR-4 dielectric, and has a dielectric constant ∈ 4.3 and a loss tangent of 0.025.
The material of the metal structure layer 1 and the grounding layer 3 is copper.
The length and width of the ground layer 3 are equal to the length and width of the dielectric layer 2, respectively.
Example 2
The steps of the method are the same as those in embodiment 1 except that the micro broadband metamaterial wave absorber is in a periodic structure, and the micro broadband metamaterial wave absorber with 4x4 periodic unit structures is prepared.
Performance testing
FIG. 4 is S obtained by CST simulation of the micro broadband metamaterial absorber in example 111A parameter map.
Fig. 5 is a wave absorption rate curve diagram of the micro broadband metamaterial in embodiment 1, and it can be known from the graph that ultra-high wave absorption is realized in a frequency range of 28Ghz to 54Ghz, and the wave absorption rate can reach 99.9% at most.
Fig. 6 is a structural diagram of a micro broadband metamaterial absorber with a 4 × 4 periodic unit structure in embodiment 2.
FIG. 7 shows a 4 × 4 periodic cell structure in example 2S obtained by simulating a micro broadband metamaterial wave absorber through CST11A parameter map.
Fig. 8 is an absorption rate curve diagram of a micro broadband metamaterial wave absorber with 4 × 4 periodic unit structures in embodiment 2, and it can be known that ultra-high wave absorption is realized in a frequency range of 28 Ghz-54 Ghz, and the wave absorption rate can reach 99.9% at most.
Fig. 9 is an absorptivity curve of incident wave passing through a miniature broadband metamaterial wave absorber with 4x4 periodic unit structures under different incident angles in example 2. It is apparent from the figure that at incident angles less than 35°In the process, the absorption rate still keeps more than 90% in the working frequency range, and the wave absorption rate is continuously reduced along with the continuous increase of the incident angle.
In summary, the invention provides a micro broadband metamaterial wave absorber, which comprises a first metal structure layer, a second dielectric layer and a third ground layer, wherein the metal structure layer comprises two mountain-shaped patches, the bottoms of the two mountain-shaped patches are respectively connected with the lower bottom of a trapezoidal patch, the two mountain-shaped patches are connected through a rectangular connecting patch, and the rectangular connecting patch is positioned in the middle of the top of the mountain-shaped patch; the metal structure layer is positioned in the middle of the dielectric layer and forms 45 degrees with the horizontal direction of the dielectric layer°Thereby realizing the wave absorbing effect. The micro broadband metamaterial wave absorber can perfectly absorb vertical incidence waves within the frequency range of 28-54 Ghz, and the highest absorption rate can reach 99.9%; the metamaterial wave absorber can realize wave absorption at a wide incident angle within the frequency range of 28-54 Ghz, and the maximum incident angle can reach 35°Incident angle of 0°～35°Within the range, the wave absorbing rate reaches more than 90 percent.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A miniature broadband metamaterial absorber is characterized in that:
the micro broadband metamaterial wave absorber is of a periodic structure and consists of M multiplied by N periodic unit structures;
the periodic unit structure comprises a first metal structure layer, a second dielectric layer and a third grounding layer;
the metal structure layer consists of 2 Chinese character 'shan' shaped patches, 2 trapezoidal patches and 1 rectangular connecting patch;
the rectangular connecting patch connects the 2 Chinese character 'shan' patches through the middle parts of the 2 Chinese character 'shan' patches, and the bottom of the Chinese character 'shan' patch is connected with the lower bottom of the trapezoidal patch;
the metal structure layer is positioned in the middle of the dielectric layer and forms 45 degrees with the horizontal direction of the dielectric layer°。
2. The miniature broadband metamaterial absorber of claim 1, wherein: the wave absorbing rate of the miniature broadband metamaterial wave absorber reaches 90-99% under the working frequency band of 28 GHz-54 GHz.
3. The miniature broadband metamaterial absorber of claim 1, wherein: the upper bottom, the lower bottom and the height of the trapezoidal patch are respectively W1-0.2 mm, W2-0.8 mm and L1-0.2 mm.
4. The miniature broadband metamaterial absorber of claim 1, wherein: the width of the middle peak of the Chinese character 'shan' shaped patch is W3 ═ 0.2 mm; the width between peaks of the Chinese character 'shan' shaped patch is W4 ═ 0.15 mm; the height from the peak bottom to the peak top of the Chinese character 'shan' shaped patch is L2-0.3 mm; the height of the Chinese character 'shan' shaped patch is L3 ═ 0.4 mm.
5. The miniature broadband metamaterial absorber of claim 1, wherein: the length and width of the rectangular connecting patch are respectively 0.4mm L4 mm and 0.2mm W3 mm.
6. The miniature broadband metamaterial absorber of claim 1, wherein: the thickness of the metal structure layer is 0.035mm, and the thickness of the grounding layer is 0.035 mm.
7. The miniature broadband metamaterial absorber of claim 1, wherein: the dielectric layer is FR-4 dielectric, the dielectric constant is epsilon 4.3, and the loss tangent is 0.025.
8. The miniature broadband metamaterial absorber of claim 7, wherein: the thickness and the side length of the dielectric layer are respectively h-0.8 mm and p-2 mm.
9. The miniature broadband metamaterial absorber of claim 1, wherein: the metal structure layer and the grounding layer are made of copper.
10. The miniature broadband metamaterial absorber of claim 9, wherein: the length and the width of the grounding layer are respectively equal to those of the dielectric layer.
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- 2021-12-10 CN CN202111506398.2A patent/CN114336070A/en active Pending
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