CN112968291A - Double-layer heterogeneous sequence structure microwave infrared compatible metamaterial based on rhombic elements - Google Patents
Double-layer heterogeneous sequence structure microwave infrared compatible metamaterial based on rhombic elements Download PDFInfo
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Abstract
The invention discloses a double-layer heterogeneous sequence structure microwave infrared compatible metamaterial based on rhombic elements, which comprises an upper layer and a lower layer, wherein the upper layer and the lower layer are both composed of rhombic elements, the bottom layer of the metamaterial is arranged according to a quasi-periodic sequence configuration mode, the top layer of the metamaterial can be arranged according to a periodic or quasi-periodic sequence configuration mode, and the shape of the metamaterial is rhombic bulges. The bottom layer of the rhombic elements has the function of microwave absorption, and the performance of the bottom layer of the rhombic elements is better than that of a flat plate and a periodic structure wave-absorbing material with the same component proportion and the same thickness. The top layer element has the function of enhancing microwave absorption and simultaneously reflecting infrared waves, and can reduce the infrared emissivity of the material while being compatible with the microwave absorption performance of the bottom layer. The diamond-shaped elements at the bottom layer are divided into two types of sizes. The bottom layer rhomboid element material is a mixture of powder and resin with microwave absorption performance, and the top layer rhomboid element material is a metal or nonmetal material with higher conductivity.
Description
Technical Field
The invention relates to a metamaterial compatible with electromagnetic waves of two frequency bands, in particular to a double-layer heterogeneous sequence microwave infrared compatible metamaterial based on rhombic elements.
Background
Microwave technology provides convenience for human beings in communication, satellite positioning and radar detection, but also brings new problems. Such as microwave, have become a new pollution source and have adverse effects on human health, and thus the development of a novel microwave absorbing material is required to solve the above problems. In specific applications, the integration trend of microwave absorbing materials requires that the materials can obtain a wider electromagnetic wave absorption bandwidth with a thickness as thin as possible, and therefore, how to improve the absorption bandwidth without increasing the thickness of the materials is an important problem in the application of the microwave absorbing materials. Moreover, when the microwave absorbing material is applied, the microwave absorbing material can be radiated by infrared rays in the nature, and the microwave absorbing material generally has stronger electromagnetic wave absorbing capacity to infrared bands, so that the microwave absorbing material is easy to absorb infrared rays of solar radiation and generate heat when in use, and the equipment failure rate is increased, thereby being not beneficial to the use of devices. Furthermore, when microwave absorbing materials are used in stealth applications, it is desirable that the materials absorb microwaves to avoid radar detection, and that the materials reflect infrared waves to avoid infrared detector tracking. The two aspects of performance are difficult to be compatible in the same material, and the development of compatible materials is restricted.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a quasi-periodic structure metamaterial which is novel in structure, ingenious in conception and simple and convenient to process and is based on diamond-shaped elements, and the compatibility of two frequency bands is realized in a two-layer overlapping mode. The rhombic elements constructed at the bottom layer are arranged in a quasi-periodic structure mode, and the absorption performance of the quasi-periodic structure wave-absorbing material is better than that of a flat plate and a periodic structure wave-absorbing material with the same component proportion and the same thickness. The top layer structure material can realize the enhancement of the bottom layer wave absorption performance and simultaneously reduce the infrared emissivity.
The technical solution of the invention is as follows: a microwave infrared compatible metamaterial with a double-layer heterogeneous structure based on diamond-shaped elements is characterized in that: the material generally comprises two layers, wherein adjacent layers are bonded by adhesive materials, the two layers are both formed by rhombic elements, the elements at the bottom layer are arranged according to a quasi-periodic sequence configuration mode, the shapes of the elements are rhombic bulges, the side length range of the rhombus is adjustable between 0.1mm and 50mm, the spacing distance between the edges of the adjacent rhombuses is adjustable between 0.1mm and 10mm, and the thickness of the rhombus is adjustable between 0.1mm and 10 mm; the top layer elements can be arranged in a periodic or quasi-periodic configuration mode, the shape of the elements is a diamond bulge, the side length range of the diamond is adjustable between 0.1 mu m and 50mm, the spacing distance between the edges of adjacent diamonds is adjustable between 0.01 mu m and 10mm, and the thickness of the diamond is adjustable between 0.01 mu m and 100 mu m. The bottom layer of the rhombus-shaped elements has the function of microwave absorption, and the performance of the bottom layer of the rhombus-shaped elements is better than that of flat plates and periodic structure wave-absorbing materials with the same component proportion and the same thickness. The top layer element has the function of enhancing microwave absorption and simultaneously reducing the infrared emissivity of the material.
The bottom layer rhomboid element material is a mixture of powder and resin with microwave absorption performance, and the top layer rhomboid element material is a metal or nonmetal material with higher conductivity.
Further, in the above technical solution, the powder having microwave absorption performance is selected from graphene, carbon nanotubes, carbonyl iron powder, and ferrite; the resin is organic resin and is selected from polyurethane and epoxy resin; the metal or non-metal material with higher conductivity is selected from aluminum, copper, Indium Tin Oxide (ITO).
Compared with the prior art, the invention has the following advantages:
the quasi-periodic structure metamaterial based on the diamond-shaped elements has the advantages that the quasi-periodic element structure is adopted for the first time to improve the microwave absorption performance, compared with a periodic structure, the quasi-periodic local symmetry and the global symmetry are different, the local symmetry can be overlapped in a translation mode, the global symmetry cannot be overlapped, namely the quasi-periodic structure breaks the translation symmetry, and therefore under the action of incident electromagnetic waves, the near-field coupling effect of the elements is different from that of the periodic structure necessarily, and the quasi-periodic structure metamaterial has a new regulation dimension on the electromagnetic waves. And the reciprocal lattice vector scale can be compared with the light wave vector in the nonlinear process, so that the electromagnetic wave can generate new physical effects, such as: the quasi-periodic wave absorbing material has the advantages that the quasi-periodic wave absorbing material can enhance the absorption of electromagnetic waves by phase control through optical spin Hall effect, second harmonic wave, four-wave mixing and the like, the quasi-periodic wave absorbing material has more freedom degree than periodic arrangement, and the quasi-periodic wave absorbing material can have better performance than flat plates and periodic wave absorbing materials with the same component proportion and the same thickness. And after the top layer is arranged with diamond-shaped elements, the compatibility of microwave absorption performance and infrared reflection can be realized. Therefore, the method is particularly suitable for popularization and application in the field and has wide prospect.
Drawings
FIG. 1 is a diagram illustrating different arrangements of quasi-periodic cell structures.
Fig. 2 is a schematic diagram of the structure of the bottom layer primitive and the top layer primitive, the bottom layer structure is penrose diamond quasi-periodic arrangement, and the top layer is a diamond periodic structure.
Figure 3 is a graph of the microwave absorption properties of the material.
Detailed Description
The following description will explain embodiments of the present invention with reference to the accompanying drawings.
Example 1
As shown in fig. 1, 2, and 3: a quasi-periodic structure metamaterial based on diamond-shaped elements is shown in FIG. 1, which is a schematic arrangement diagram of a bottom layer diamond-shaped quasi-periodic element structure, and the arrangement of the structure has rotational symmetry but no translational symmetry, so that the structure is quasi-periodic.
Furthermore, the double-layer structure arrangement is carried out, so that the wave-absorbing performance enhancement and the compatibility are further realized. Fig. 2 is a schematic diagram of the primitive sequences of the bottom layer and the top layer, the bottom layer adopts a penrose quasi-periodic jigsaw puzzle layout mode, which is a typical quasi-periodic sequence and is characterized by having five-fold symmetry but no translational symmetry, and the local symmetry and the global symmetry of the primitive are different from those of the flat plate and the periodic sequence material, so that the interaction with the microwave can introduce the new effect to enhance the absorption performance. In the quasi-periodic structure, large and small rhombus elements are paved on the whole plane according to a quasi-periodic structure form, the acute angle of the large rhombus is 72 degrees, the sum of the areas of the large rhombus and the small rhombus accounts for 61.8 percent of the total area of the bottom element, the acute angle of the small rhombus is 36 degrees, the sum of the areas of the small rhombus and the small rhombus accounts for 38.2 percent of the total area of the bottom element, and the area ratio of the large rhombus and the small. The side length of the bottom layer diamond-shaped element is 10mm, the thickness of the bottom layer diamond-shaped element is 2mm, and the interval width between the adjacent elements is 1 mm. The material is a mixture of carbonyl iron powder and polyurethane resin with microwave absorption performance, the carbonyl iron powder is purchased from Shaanxi Xingheng chemical company, the polyurethane resin is purchased from Shanghai Hecheng polymer technology company, the preparation method is that the carbonyl iron powder and the polyurethane are mixed according to the mass ratio of 6:1, the mixture is firstly stirred at a high speed (500rpm) for 15min, then ultrasonic oscillation is carried out for 15min, and then the stirring oscillation process is repeated once to obtain stable and uniform suspension liquid. Then coating the material on a square aluminum plate (200mm multiplied by 1.5mm), pressing the material on the flat plate material by using a die processed by a entrusted factory, keeping the material for 24 hours, demolding after the material is completely cured, and filling the interval part with pure polyurethane resin to ensure that the top surface of the material is a plane, thereby obtaining the bottom-layer element sequence material. The microwave absorption performance of the diamond-shaped element is tested by adopting a bow method in a microwave dark room and compared with a flat plate material with the same component proportion and thickness, and the result is shown in figure 3, and no matter the diamond-shaped element is compared with a common flat plate material or a common periodic sequence material (the common periodic sequence material is in a square shape, the side length is 10mm, the thickness is 2mm, and the interval distance between elements is 1mm), the frequency band for realizing 90% effective absorption (the reflection loss is less than or equal to-10 dB) is wider, and the quasi-periodic sequence material of the diamond-shaped element has more excellent microwave absorption performance.
But only the bottom layer of Penrose structure is arranged, the infrared emissivity is 0.85, the value is higher, so the compatibility is realized by further preparing the double-layer structure, the top layer is made of aluminum foil, and the conductivity is 1 multiplied by 107S/m, when the top layer is not orderly structured (namely a complete flat plate), the infrared emissivity is 0.06 (the tested infrared wavelength range is 8-22 μm), although the value is very low, the reflection loss is close to 0 in the whole frequency band at the moment, almost no effective absorption exists, compatibility can not be realized, the top layer is further arranged in a rhombus structure, the top layer does not need the special effect of a quasiperiodic form and adopts a periodic or quasiperiodic form, so that rhombuses (namely squares) with internal angles of 90 ℃ are particularly adopted for periodic sequence arrangement, the side length of each rhombus is 3.5mm, the spacing distance between adjacent elements is 0.5mm, the thickness of the elements is 40 μm, and the commercially available elements are adoptedThe universal adhesive is flatly stuck on a bottom layer material, and the infrared emissivity of the universal adhesive is tested to be 0.28, which shows that the universal adhesive still has higher infrared reflection performance (according to the quantum mechanics principle, the higher the infrared reflectivity of the material is, the lower the emissivity is). Further, as shown in fig. 3, it can be seen that after the top layer rhombus element structure is stacked on the bottom layer, the material can achieve an absorption rate of more than 80% (reflection loss is less than or equal to-7 dB), still achieve effective absorption, and expand the effective absorption range of the material at low frequency, and the effective absorption bandwidth of the material is 3.72-17.16GHz, wherein the absorption rate is more than 80% (RL is less than or equal to-7 dB). Therefore, the compatibility of effective microwave absorption and low infrared emissivity is realized through the arrangement of the upper and lower layers of element structures, and the microwave-assisted infrared absorption device has good practical value.
Claims (4)
1. A microwave infrared compatible metamaterial with a double-layer heterogeneous structure based on diamond-shaped elements is characterized in that: the material generally comprises an upper layer and a lower layer, wherein adjacent layers are bonded by adhesive materials, the two layers are both formed by rhombic elements, the bottom layer of the elements are arranged according to a quasi-periodic sequence configuration mode, the shapes of the elements are rhombic bulges, the side length range of the rhombus is adjustable between 0.1mm and 50mm, the spacing distance between adjacent rhombus edges is adjustable between 0.1mm and 10mm, and the thickness of the rhombus is adjustable between 0.1mm and 10 mm; the top layer elements are arranged in a periodic or quasi-periodic sequence configuration mode, the shapes of the elements are rhombic bulges, the side length range of the rhombus is adjustable between 0.1 mu m and 50mm, the spacing distance between the edges of the adjacent rhombuses is adjustable between 0.01 mu m and 10mm, and the thickness of the rhombus is adjustable between 0.01 mu m and 100 mu m; the bottom layer rhomboid element material is a mixture of powder and resin with microwave absorption performance, and the top layer rhomboid element material is a metal or nonmetal material with higher conductivity.
2. A metamaterial according to claim 1, wherein: the diamond-shaped elements at the bottom layer are divided into two types of sizes.
3. A metamaterial according to claim 1, wherein: the conductivity of the material of the top layer diamond-shaped element is 1 multiplied by 106～1×108S/m。
4. A metamaterial according to claim 1, wherein: the powder with microwave absorption performance is selected from graphene, carbon nano tubes, carbonyl iron powder and ferrite; the resin is organic resin and is selected from polyurethane and epoxy resin; the metal or non-metal material with higher conductivity is selected from aluminum, copper and indium tin oxide.
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| CN114142238A (en) * | 2021-11-12 | 2022-03-04 | 大连理工大学 | Microwave/infrared electromagnetic compatible metamaterial based on polygonal element structure and preparation method thereof |
| CN114389046A (en) * | 2022-01-05 | 2022-04-22 | 电子科技大学 | Infrared electromagnetic periodic structure with selective absorption and beam anisotropic reflection functions |
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