CN113540820A - Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves - Google Patents
Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves Download PDFInfo
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- CN113540820A CN113540820A CN202110817922.1A CN202110817922A CN113540820A CN 113540820 A CN113540820 A CN 113540820A CN 202110817922 A CN202110817922 A CN 202110817922A CN 113540820 A CN113540820 A CN 113540820A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The invention provides a stepped cylindrical resonance structure and an absorber of multi-frequency electromagnetic waves, the stepped cylindrical resonance structure comprises: a plurality of cylindrical structures; the circles of the cylindrical structures are coaxially arranged on the same plane, and the radiuses of the cylindrical structures are sequentially increased from inside to outside; the heights of the plurality of cylinder structures are sequentially reduced from inside to outside. The stepped cylindrical resonance structure provided by the invention increases the absorption area of electromagnetic waves and improves the absorption efficiency of large-angle incident electromagnetic waves.
Description
Technical Field
The invention relates to the technical field of electromagnetic wave absorption, in particular to a stepped cylindrical resonance structure and an absorber of multi-frequency electromagnetic waves.
Background
As an artificially designed composite material, the metamaterial draws high attention from the academic world due to unique physical properties. The metamaterial is used as a wave absorbing body, and the metamaterial has the advantages of flexible design, adjustable response and thin thickness. In addition, the metamaterial wave absorber can realize ultra-wide band and extremely-narrow band, and is widely applied to the fields of stealth materials, terahertz imaging, biomedicine, intelligent communication, photoelectric detection and the like. In recent years, researchers have made a lot of research in the direction of a multiband metamaterial wave absorber, but the current multiband metamaterial wave absorber has low absorption rate to electromagnetic waves incident at a large angle, and the application of the wave absorber is greatly limited.
Disclosure of Invention
The invention aims to provide a stepped cylindrical resonance structure and an absorber of multi-frequency electromagnetic waves, which can improve the absorption efficiency of large-angle incident electromagnetic waves.
In order to achieve the purpose, the invention provides the following scheme:
a stepped tubular resonating structure comprising:
a plurality of cylindrical structures;
the circles of the cylindrical structures are coaxially arranged on the same plane, and the radiuses of the cylindrical structures are sequentially increased from inside to outside; the heights of the plurality of cylinder structures are sequentially reduced from inside to outside.
Optionally, the height difference between any two adjacent cylinder structures is equal; the radius difference between any two adjacent cylindrical structures is equal.
Optionally, the thicknesses of the plurality of cylindrical structures are all equal.
An absorber of multi-frequency electromagnetic waves, the absorber comprising:
a plurality of absorption units;
the structures and the sizes of the absorption units are the same; the absorption units are arranged in a periodic and continuous manner;
the absorption unit specifically includes:
a dielectric substrate and the stepped cylindrical resonant structure;
the stepped cylindrical resonance structure is embedded in the dielectric substrate.
Optionally, the bottom of the dielectric substrate is covered with a metal film.
Optionally, the metal film is made of copper.
Optionally, the material of the dielectric substrate is photosensitive resin.
Optionally, the material of the stepped cylindrical resonant structure is conductive silver paste.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a stepped cylindrical resonance structure and an absorber of multi-frequency electromagnetic waves, the stepped cylindrical resonance structure comprises: a plurality of cylindrical structures; the circles of the cylindrical structures are coaxially arranged on the same plane, and the radiuses of the cylindrical structures are sequentially increased from inside to outside; the heights of the plurality of cylinder structures are sequentially reduced from inside to outside. The stepped cylindrical resonance structure provided by the invention increases the absorption area of electromagnetic waves and improves the absorption efficiency of large-angle incident electromagnetic waves.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a stepped cylindrical resonant structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an absorption unit in an embodiment of the present invention;
FIG. 3 is a top view of an absorbent unit in an embodiment of the present invention;
FIG. 4 is a cross-sectional view of an absorbent unit in an embodiment of the present invention;
FIG. 5 is a graph showing the simulation result of the absorption rate at normal incidence of the absorber of the multi-frequency electromagnetic wave according to the embodiment of the present invention;
FIG. 6 is a graph showing the comparison of the absorption rate of electromagnetic waves at different polarization angles of TE (Transverse Electric) polarized waves in the embodiment of the present invention;
fig. 7 is a graph showing the results of absorption rate simulation at an oblique incident angle θ of 15 ° for the TE polarized wave in the embodiment of the present invention;
fig. 8 is a graph showing the results of absorption rate simulation at an oblique incident angle θ of 30 ° for the TE polarized wave in the embodiment of the present invention;
fig. 9 is a graph showing the results of absorption rate simulation at an oblique incident angle θ of 45 ° for the TE polarized wave in the embodiment of the present invention;
FIG. 10 is a graph of absorption versus angle of incidence of 15-45 at a TE polarized wave in an example embodiment of the invention;
description of the drawings: 1-a dielectric substrate; 2-a stepped cylindrical resonant structure; 3-metal film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a stepped cylindrical resonance structure and an absorber of multi-frequency electromagnetic waves, which can improve the absorption efficiency of large-angle incident electromagnetic waves.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic diagram of a stepped cylindrical resonant structure in an embodiment of the present invention, and as shown in fig. 1, the present invention provides a stepped cylindrical resonant structure, including:
a plurality of cylindrical structures; circles of the plurality of cylindrical structures are coaxially arranged on the same plane, and the radiuses of the plurality of cylindrical structures are sequentially increased from inside to outside; the heights of the plurality of cylinder structures are sequentially reduced from inside to outside.
Specifically, the height difference between any two adjacent cylindrical structures is equal; the radius difference between any two adjacent cylindrical structures is equal.
The thickness of the plurality of cylindrical structures is equal.
FIG. 2 is a schematic structural view of an absorption unit in an embodiment of the present invention; FIG. 3 is a top view of an absorbent unit in an embodiment of the present invention; FIG. 4 is a cross-sectional view of an absorbent unit in an embodiment of the present invention; as shown in fig. 2 to 3, the present invention also provides an absorber of multi-frequency electromagnetic waves, comprising:
a plurality of absorption units;
the structures and the sizes of the absorption units are the same; the absorption units are arranged in a periodic and continuous manner;
the absorption unit specifically includes:
a dielectric substrate 1 and the stepped cylindrical resonant structure 2;
the stepped cylindrical resonant structure 2 is embedded in the dielectric substrate 1.
Specifically, the bottom surface of the dielectric substrate is square, the thickness of the bottom surface is 1.75mm, and the side length of the square is 5 mm; the stepped cylindrical resonance structure layer comprises 7 concentric cylinders, the thickness of each cylinder is d equal to 0.05mm, the inner diameter difference of each adjacent cylinder is r equal to 0.3mm, the height difference of each adjacent cylinder is h equal to 0.2mm, the inner diameter of the cylinder closest to the center of the circle is r1 equal to 0.25mm, the height of the cylinder is h1 equal to 1.4mm, and the distance L1 from the top surface of the cylinder closest to the center of the circle to the upper surface of the dielectric substrate is 0.1 mm; the distance L2 between the bottom surface of the cylinder and the lower surface of the dielectric substrate is 0.25 mm.
In addition, the bottom of the dielectric substrate 1 is covered with the metal film 3.
Specifically, the material of the metal film is copper.
The material of the medium substrate is photosensitive resin; the dielectric constant was 2.9 and the loss tangent was 0.02.
The material of the stepped cylindrical resonance structure is conductive silver paste; conductivity of 5.88X 105s/m。
FIG. 5 is a graph showing the simulation result of the absorption rate at normal incidence of the absorber of the multi-frequency electromagnetic wave according to the embodiment of the present invention; as shown in figure 5, the absorber provided by the invention generates three resonance frequency points at 12.84GHZ, 15.44GHZ and 18.68GHZ, and the absorptance at the three points reaches more than 95%.
Fig. 6 is a graph showing the absorption rate of electromagnetic waves at different polarization angles of TE polarized waves in an embodiment of the present invention. As shown in fig. 6, the wave absorber provided by the present invention has a consistent wave absorption rate curve for electromagnetic waves incident under different polarization angles, and thus, the wave absorber provided by the present invention has polarization insensitivity.
Fig. 7 is a graph showing the results of absorption rate simulation when the oblique incident angle θ is 15 ° in the TE polarized wave in the embodiment of the present invention. Fig. 8 is a simulation result of absorption at an oblique incident angle θ of 30 ° for a TE polarized wave in an embodiment of the present invention, fig. 9 is a simulation result of absorption at an oblique incident angle θ of 45 ° for a TE polarized wave in an embodiment of the present invention, fig. 10 is a comparison graph of absorption at an oblique incident angle of 15 ° to 45 ° for a TE polarized wave in an embodiment of the present invention; wherein, the abscissa in fig. 5-10 is the electromagnetic wave frequency, and the ordinate is the electromagnetic wave absorption rate; as shown in fig. 7-10, the wave absorber provided by the present invention has high absorption rate even at a large incident angle, the absorption of three resonance peaks reaches 90% at an oblique incident angle of 45 °, the absorption frequency changes little with the incident angle, and the wave absorber has excellent frequency stability.
The stepped cylindrical resonance structure and the absorber of the multi-frequency electromagnetic wave have high symmetry, so the stepped cylindrical resonance structure and the absorber of the multi-frequency electromagnetic wave have polarization insensitivity, can absorb electromagnetic waves of different polarization types and electromagnetic waves incident at different polarization angles, have high absorptivity even under a large incident angle, are hardly influenced by the incident angle of the electromagnetic wave, and have excellent frequency stability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A stepped tubular resonant structure, comprising:
a plurality of cylindrical structures;
the circles of the cylindrical structures are coaxially arranged on the same plane, and the radiuses of the cylindrical structures are sequentially increased from inside to outside; the heights of the plurality of cylinder structures are sequentially reduced from inside to outside.
2. The stepped cylindrical resonant structure of claim 1, wherein the height difference of any two adjacent cylindrical structures is equal; the radius difference between any two adjacent cylindrical structures is equal.
3. The absorber of multi-frequency electromagnetic waves as defined in claim 2, wherein the plurality of cylindrical structures are all of equal thickness.
4. An absorber of multifrequency electromagnetic waves, the absorber comprising:
a plurality of absorption units;
the structures and the sizes of the absorption units are the same; the absorption units are arranged in a periodic and continuous manner;
the absorption unit specifically includes:
a dielectric substrate and the stepped cylindrical resonator structure of any one of claims 1 to 3;
the stepped cylindrical resonance structure is embedded in the dielectric substrate.
5. The absorber of multifrequency electromagnetic waves of claim 4, wherein the bottom of the dielectric substrate is covered with a metal film.
6. The absorber of multifrequency electromagnetic waves of claim 5, wherein the material of said metal film is copper.
7. The absorber of multifrequency electromagnetic waves of claim 4, wherein the material of said dielectric substrate is a photosensitive resin.
8. The absorber of multifrequency electromagnetic waves of claim 4, wherein the material of the stepped cylindrical resonant structure is a conductive silver paste.
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| CN202110817922.1A CN113540820B (en) | 2021-07-20 | 2021-07-20 | Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves |
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| CN202110817922.1A CN113540820B (en) | 2021-07-20 | 2021-07-20 | Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves |
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Citations (8)
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| JPH09186484A (en) * | 1995-12-27 | 1997-07-15 | Michiharu Takahashi | Wide band electronic waves absorber |
| WO2013014406A2 (en) * | 2011-07-25 | 2013-01-31 | Qinetiq Limited | Radiation absorption |
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| CN107946776A (en) * | 2017-11-21 | 2018-04-20 | 山西大学 | A kind of multiband absorbing meta-material |
| CN108666763A (en) * | 2018-04-15 | 2018-10-16 | 哈尔滨理工大学 | A kind of broadband Terahertz absorber based on high doping semiconductor |
| CN110137691A (en) * | 2019-06-11 | 2019-08-16 | 电子科技大学 | Ultra wide band wave absorbing device based on periodical magnetic material |
| CN211856957U (en) * | 2019-11-06 | 2020-11-03 | 南京邮电大学 | Blue light absorber based on multilayer structure |
| CN112134026A (en) * | 2020-09-25 | 2020-12-25 | 合肥工业大学 | Multi-frequency metamaterial wave absorbing body with three-dimensional structure |
-
2021
- 2021-07-20 CN CN202110817922.1A patent/CN113540820B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09186484A (en) * | 1995-12-27 | 1997-07-15 | Michiharu Takahashi | Wide band electronic waves absorber |
| WO2013014406A2 (en) * | 2011-07-25 | 2013-01-31 | Qinetiq Limited | Radiation absorption |
| CN107093805A (en) * | 2017-06-02 | 2017-08-25 | 湖北工业大学 | A kind of Terahertz broadband absorbs the design method of Meta Materials |
| CN107946776A (en) * | 2017-11-21 | 2018-04-20 | 山西大学 | A kind of multiband absorbing meta-material |
| CN108666763A (en) * | 2018-04-15 | 2018-10-16 | 哈尔滨理工大学 | A kind of broadband Terahertz absorber based on high doping semiconductor |
| CN110137691A (en) * | 2019-06-11 | 2019-08-16 | 电子科技大学 | Ultra wide band wave absorbing device based on periodical magnetic material |
| CN211856957U (en) * | 2019-11-06 | 2020-11-03 | 南京邮电大学 | Blue light absorber based on multilayer structure |
| CN112134026A (en) * | 2020-09-25 | 2020-12-25 | 合肥工业大学 | Multi-frequency metamaterial wave absorbing body with three-dimensional structure |
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