阅读说明：本技术 一种超宽带螺旋式层叠吸波器 (Spiral range upon range of ripples ware of ultra wide band ) 是由 章海锋 曾立 于 2020-04-01 设计创作，主要内容包括：本发明公开了一种超宽带螺旋式层叠吸波器,包括：底层设置金属反射层,金属反射层上设置至少一个超宽带螺旋式层叠吸波单元,当超宽带螺旋式层叠吸波单元多于一个,所有超宽带螺旋式层叠吸波单元采用相同结构并且在金属反射层上等距设置；超宽带螺旋式层叠吸波单元包括至少一层介质层,在顶层介质层上设置顶层阿基米德螺旋金属结构,其中在每个介质层中嵌入设置至少两层阿基米德螺旋金属结构；若介质层多于一层,则所有介质层从底层介质层到顶层介质层呈金字塔设置；所有阿基米德螺旋金属结构能够被从底层到顶层划分为与介质层数量相同的各个金字塔结构。本发明提供的吸波器的吸收频率可以横跨红外、可见光、紫外三个频段。(The invention discloses an ultra-wideband spiral type laminated wave absorber, which comprises: the bottom layer is provided with a metal reflecting layer, at least one ultra-wideband spiral type laminated wave-absorbing unit is arranged on the metal reflecting layer, and when more than one ultra-wideband spiral type laminated wave-absorbing unit is arranged, all the ultra-wideband spiral type laminated wave-absorbing units adopt the same structure and are arranged on the metal reflecting layer at equal intervals; the ultra-wideband spiral type laminated wave absorbing unit comprises at least one dielectric layer, wherein a top Archimedes spiral metal structure is arranged on the top dielectric layer, and at least two layers of Archimedes spiral metal structures are embedded in each dielectric layer; if the dielectric layers are more than one layer, all the dielectric layers are arranged in a pyramid from the bottom dielectric layer to the top dielectric layer; all the Archimedes spiral metal structures can be divided into the pyramid structures with the same number of dielectric layers from the bottom layer to the top layer. The absorption frequency of the wave absorber provided by the invention can span three frequency bands of infrared, visible light and ultraviolet.)

1. An ultra-wideband spiral laminated absorber, comprising: the bottom layer is provided with a metal reflecting layer, at least one ultra-wideband spiral type laminated wave-absorbing unit is arranged on the metal reflecting layer, and when more than one ultra-wideband spiral type laminated wave-absorbing unit is arranged, all the ultra-wideband spiral type laminated wave-absorbing units adopt the same structure and are arranged on the metal reflecting layer at equal intervals;

the ultra-wideband spiral type laminated wave absorbing unit comprises at least one dielectric layer, a top Archimedes spiral metal structure is arranged on the top dielectric layer, and at least two layers of Archimedes spiral metal structures are embedded in each dielectric layer; if the medium layers of the ultra-wideband spiral type laminated wave-absorbing unit are more than one, all the medium layers are arranged in a pyramid from the bottom medium layer to the top medium layer; all the Archimedes spiral metal structures can be divided into the pyramid structures with the same number of dielectric layers from the bottom layer to the top layer.

2. The ultra-wideband spiral type laminated wave absorber according to claim 1, wherein the ultra-wideband spiral type laminated wave absorbing unit comprises a first dielectric layer, a second dielectric layer and a third dielectric layer arranged from the bottom layer to the top layer, and further comprises nine layers of Archimedes spiral metal structures, wherein the two layers of Archimedes spiral metal structures are embedded in the first dielectric layer from the bottom layer, one layer of Archimedes spiral metal structure is arranged between the first dielectric layer and the second dielectric layer, and the two layers of Archimedes spiral metal structures embedded in the first dielectric layer and the one layer of Archimedes spiral metal structure arranged between the first dielectric layer and the second dielectric layer form a first pyramid structure;

two layers of Archimedes spiral metal structures are embedded in the second dielectric layer, one layer of Archimedes spiral metal structure is arranged between the second dielectric layer and the third dielectric layer, and the two layers of Archimedes spiral metal structures embedded in the second dielectric layer and the one layer of Archimedes spiral metal structure arranged between the second dielectric layer and the third dielectric layer form a second pyramid structure;

two layers of Archimedes spiral metal structures are embedded in the third dielectric layer, and the two layers of Archimedes spiral metal structures embedded in the third dielectric layer and the top layer of Archimedes spiral metal structures form a third pyramid structure.

3. The ultra-wideband spiral type laminated wave absorber according to claim 1, wherein the ultra-wideband spiral type laminated wave absorbing unit comprises a first dielectric layer, a second dielectric layer and a third dielectric layer arranged from the bottom layer to the top layer, and further comprises nine layers of Archimedes spiral metal structures, wherein the two layers of Archimedes spiral metal structures are embedded in the first dielectric layer from the bottom layer, the three layers of Archimedes spiral metal structures are embedded in the second dielectric layer, and the three layers of Archimedes spiral metal structures are embedded in the third dielectric layer;

two layers of Archimedes spiral metal structures embedded in the first dielectric layer and a first layer of Archimedes spiral metal structures embedded from bottom to top in the second dielectric layer form a first pyramid structure;

the second layer and the third layer of Archimedes spiral metal structures embedded in the second dielectric layer from bottom to top and the first layer of Archimedes spiral metal structures embedded in the third dielectric layer from bottom to top form a second pyramid structure;

and the second layer and the third layer of Archimedes spiral metal structures embedded from bottom to top in the third dielectric layer and the top layer of Archimedes spiral metal structures form a third pyramid structure.

4. The ultra-wideband spiral laminated absorber according to any one of claims 2-3, wherein the first, third, fourth, sixth, seventh and ninth layers of Archimedes spiral structures have the same spiral direction from bottom to top, and the second, fifth and eighth layers of Archimedes spiral structures have the same spiral direction, and have a 180 ° difference with the other six layers of spiral directions.

5. The ultra-wideband spiral laminated absorber according to any one of claims 2 to 3, wherein the inner radius of the first layer of Archimedes spiral structure from bottom to top is 6.525 mm, the radius ratio is 20.3, and the number of turns is 20.3NEqual to 12, widthwEqual to 11.6 mm; starting with the first layer of archimedean spiral structures, the second through ninth layers of archimedean spiral structure sizes are scaled in order by the first layer of archimedean spiral structure sizes scaled from the center by 0.830, 0.480, 0.690, 0.5727, 0.3312, 0.393, 0.3262 and 0.1886.

6. An ultra-wideband spiral laminated absorber according to any one of claims 2 to 3, the distance between the bottom metal reflecting plate from bottom to top and the first Archimedes spiral is 20 nm, the distance between the first Archimedes spiral and the second Archimedes spiral is 54 nm, the distance between the second Archimedes spiral and the third Archimedes spiral is 50 nm, the distance between the third Archimedes spiral and the fourth Archimedes spiral is 20 nm, the distance between the fourth Archimedes spiral and the fifth Archimedes spiral is 54 nm, the distance between the fifth Archimedes spiral and the sixth Archimedes spiral is 50 nm, the distance between the sixth Archimedes spiral and the seventh Archimedes spiral is 20 nm, the distance between the seventh Archimedes spiral and the eighth Archimedes spiral is 54 nm, and the distance between the eighth Archimedes spiral and the ninth Archimedes spiral is 50 nm.

7. The ultra-wideband spiral laminated absorber according to claim 1, wherein the Archimedes spiral structure material is silver.

8. The ultra-wideband spiral laminated wave absorber of claim 1, wherein the bottom metallic reflector plate material is silver.

9. The ultra-wideband spiral laminated absorber according to claim 1, wherein the Archimedes spiral structure is 90nm thick.

10. The ultra-wideband spiral laminated wave absorber according to claim 1, wherein the dielectric layer is made of Al₂O₃The dielectric constant was 2.28 and the loss tangent was 0.04.

Technical Field

The invention belongs to the technical field of wireless communication and microwave devices, particularly relates to the field of design of a multi-band-spanning wave absorbing device, and particularly relates to an ultra-wideband spiral type laminated wave absorber.

Background

With the development of modern science and technology, satellite communication, radar detection, radio broadcasting, thermal imaging systems, etc., which transmit signals and energy using electromagnetic waves as media, are widely used. Meanwhile, the negative influence of electromagnetic wave radiation on the environment is increasing, for example, normal takeoff of an airplane can be delayed due to the interference of electromagnetic waves, the communication quality is influenced, normal operation of instruments is interfered, and the physical health of human beings can be influenced due to the electromagnetic wave radiation. Therefore, it is becoming more and more important to treat electromagnetic pollution and to shield and absorb electromagnetic waves. In addition, in the field of national defense and military, in order to prevent weaponry from being discovered and attacked by enemies and improve the tactical level of military equipment, the radar stealth technology is becoming more and more important and is highly valued by countries in the world. A metamaterial absorber is a material that absorbs most of the energy of an electromagnetic wave incident on the surface of the material, while hardly reflecting and converting the absorbed energy into other forms of energy. The wave-absorbing invisible material absorbs and converts incident electromagnetic waves into heat energy or other energy through different loss mechanisms of various materials, thereby achieving the purposes of wave absorption and invisibility. However, the traditional wave-absorbing material has the defects of narrow frequency band, large density, low performance and the like, and the application of the wave-absorbing material in micro-nano photonic devices is limited. Compared with the wave absorbing device, the wave absorbing device made of the metamaterial has the advantages of being thin in thickness, light in weight, strong in absorption and the like, and can be applied to the fields of miniature radiation detectors, optical detectors, spectral imaging, electromagnetic stealth and the like.

It is a hot research focus on how to reduce the reflection and scattering of electromagnetic waves from metamaterial structures over a wide frequency range. The broadband wave absorber can be used for improving the efficiency of a photovoltaic device, can be used as a heat detector, and can also prevent an object from being detected by electromagnetic waves. Meanwhile, infrared, visible light and ultraviolet are three extremely important frequency band ranges, and have extremely important application values in the fields of remote sensing, communication technology, cloud picture detection, electromagnetic stealth and the like, and in military use and civil use.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a broadband wave absorber to reduce the reflection and scattering of electromagnetic waves.

In order to achieve the technical purpose, the invention provides an ultra-wideband spiral type laminated wave absorber, which adopts the following technical scheme and comprises: the bottom layer is provided with a metal reflecting layer, at least one ultra-wideband spiral type laminated wave-absorbing unit is arranged on the metal reflecting layer, and when more than one ultra-wideband spiral type laminated wave-absorbing unit is arranged, all the ultra-wideband spiral type laminated wave-absorbing units adopt the same structure and are arranged on the metal reflecting layer at equal intervals;

the ultra-wideband spiral type laminated wave absorbing unit comprises at least one dielectric layer, wherein a top Archimedes spiral metal structure is arranged on the top dielectric layer, and at least two layers of Archimedes spiral metal structures are embedded in each dielectric layer; if the dielectric layers are more than one layer, all the dielectric layers are arranged in a pyramid from the bottom dielectric layer to the top dielectric layer; all the Archimedes spiral metal structures can be divided into the pyramid structures with the same number of dielectric layers from the bottom layer to the top layer. In a specific embodiment, at least two layers of archimedean spiral metal structures are optionally disposed in each dielectric layer, and at most three layers of archimedean spiral metal structures are disposed in an embedded manner.

Furthermore, the ultra-wideband spiral type laminated wave absorbing unit comprises a first medium layer, a second medium layer and a third medium layer which are arranged from the bottom layer to the top layer, and also comprises nine layers of Archimedes spiral metal structures, wherein two layers of Archimedes spiral metal structures are embedded in the first medium layer from the bottom layer, one layer of Archimedes spiral metal structure is arranged between the first medium layer and the second medium layer, and the two layers of Archimedes spiral metal structures embedded in the first medium layer and the one layer of Archimedes spiral metal structure arranged between the first medium layer and the second medium layer form a first pyramid structure;

two layers of Archimedes spiral metal structures are embedded in the second dielectric layer, one layer of Archimedes spiral metal structure is arranged between the second dielectric layer and the third dielectric layer, and the two layers of Archimedes spiral metal structures embedded in the second dielectric layer and the one layer of Archimedes spiral metal structure arranged between the second dielectric layer and the third dielectric layer form a second pyramid structure;

two layers of Archimedes spiral metal structures are embedded in the third dielectric layer, and the two layers of Archimedes spiral metal structures embedded in the third dielectric layer and the top layer of Archimedes spiral metal structures form a third pyramid structure.

Furthermore, the ultra-wideband spiral type laminated wave absorbing unit comprises a first medium layer, a second medium layer and a third medium layer which are arranged from the bottom layer to the top layer, and also comprises nine layers of Archimedes spiral metal structures, wherein the first medium layer is embedded with two layers of Archimedes spiral metal structures from the bottom layer, the second medium layer is embedded with three layers of Archimedes spiral metal structures, and the third medium layer is embedded with three layers of Archimedes spiral metal structures;

two layers of Archimedes spiral metal structures embedded in the first dielectric layer and a first layer of Archimedes spiral metal structures embedded from bottom to top in the second dielectric layer form a first pyramid structure;

the second layer and the third layer of Archimedes spiral metal structures embedded in the second dielectric layer from bottom to top and the first layer of Archimedes spiral metal structures embedded in the third dielectric layer from bottom to top form a second pyramid structure;

and the second layer and the third layer of Archimedes spiral metal structures embedded from bottom to top in the third dielectric layer and the top layer of Archimedes spiral metal structures form a third pyramid structure.

According to the above technical solution, the first, third, fourth, sixth, seventh and ninth layers of archimedean spiral structures have the same direction of rotation from bottom to top, and the second, fifth and eighth layers of archimedean spiral structures have the same direction of rotation and have a 180 ° difference with the other six layers of spiral directions.

According to the technical scheme, the inner radius of the Archimedes spiral structure of the first layer from bottom to top is 6.525 mm, the radius ratio is 20.3, and the number of turns isNWidth =12w=11.6 mm, the radius ratio being the ratio of the final radius to the initial radius before and after the rotation of the spiral; starting with the first layer of archimedean spiral structures, the second through ninth layers of archimedean spiral structure sizes are scaled in order by the first layer of archimedean spiral structure sizes scaled from the center by 0.830, 0.480, 0.690, 0.5727, 0.3312, 0.393, 0.3262 and 0.1886.

Further, the distance between the bottom-layer metal reflecting plate from bottom to top and the first layer Archimedes spiral is 20 nm, the distance between the first layer Archimedes spiral and the second layer Archimedes spiral is 54 nm, the distance between the second layer Archimedes spiral and the third layer Archimedes spiral is 50 nm, the distance between the third layer Archimedes spiral and the fourth layer Archimedes spiral is 20 nm, the distance between the fourth layer Archimedes spiral and the fifth layer Archimedes spiral is 54 nm, the distance between the fifth layer Archimedes spiral and the sixth layer Archimedes spiral is 50 nm, the distance between the sixth layer Archimedes spiral and the seventh layer Archimedes spiral is 20 nm, the distance between the seventh layer Archimedes spiral and the eighth layer Archimedes spiral is 54 nm, and the distance between the eighth layer Archimedes spiral and the ninth layer Archimedes spiral is 50 nm.

The beneficial technical effects are as follows:

the wave absorber comprises a bottom metal reflecting layer, a pyramid-shaped dielectric layer and an Archimedes spiral metal structure, wherein the pyramid-shaped dielectric layer and the Archimedes spiral metal structure are arranged on a metal reflecting plate;

the invention further designs nine layers of Archimedes spiral metal structures, wherein eight layers are embedded in the pyramid-shaped dielectric layer and one layer is arranged on the pyramid-shaped dielectric layer; the space and the size of the dielectric layer of the spiral of different layers are designed according to the interlayer coupling and the resonance principle of the Fabry-Perot cavity, and then the spiral structures of different layers are scaled according to the scale factor, so that the absorption resonance frequencies of the spiral structures are close to each other, and the ultra-wideband absorption is realized.

The invention has the characteristics of wide frequency band coverage range, flexible design, various functions, strong practicability and the like.

In the invention, three layers of Archimedes spiral metal structures are arranged in the dielectric layer to basically cover near ultraviolet, visible light and near infrared wave bands, thereby meeting most application requirements.

Drawings

Fig. 1 is a top view of an ultra-wideband spiral laminated wave absorber provided in an embodiment of the present invention;

fig. 2 is a side view of an ultra-wideband spiral laminated wave absorber provided by an embodiment of the invention, wherein 2(a) is a side view of a first embodiment, 2(b) is a side view of a second embodiment, and 2(c) is a side view of a third embodiment;

fig. 3 is a perspective view of an ultra-wideband spiral laminated wave absorber provided in an embodiment of the present invention, where 3(a) is a perspective view of a first embodiment, 3(b) is a perspective view of a second embodiment, and 3(c) is a perspective view of a third embodiment;

FIG. 4 is a schematic diagram of a first layer spiral of an ultra-wideband spiral type laminated wave absorber according to an embodiment of the present invention;

fig. 5 is a diagram of an array of ultra-wideband spiral laminated wave absorbers 3 × 3 according to an embodiment of the present invention;

fig. 6 is an absorption rate curve of a TE mode when electromagnetic waves of the ultra-wideband spiral laminated wave absorber vertically enter according to an embodiment of the present invention;

fig. 7 is an absorption rate curve of a TE mode when electromagnetic waves of the ultra-wideband spiral laminated wave absorber provided in the second embodiment of the present invention are incident perpendicularly;

fig. 8 is an absorption rate curve of the wave absorber provided in the third embodiment of the present invention in the TE mode when an electromagnetic wave is incident perpendicularly;

fig. 9 is an absorption rate curve of the wave absorber provided in the third embodiment of the present invention in the TM mode when an electromagnetic wave is incident perpendicularly;

the reference signs explain: 1. 2, 3, 4, 5, 6, 7, 8 and 9-first to nine layers of Archimedes spiral resonance structures, 12-a first dielectric layer, 11-a second dielectric layer, 10-a third dielectric layer and 13-a silver reflecting plate.

Detailed Description

The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.