CN108400448B - Candy type metamaterial wave absorber - Google Patents
Candy type metamaterial wave absorber Download PDFInfo
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- CN108400448B CN108400448B CN201810192399.6A CN201810192399A CN108400448B CN 108400448 B CN108400448 B CN 108400448B CN 201810192399 A CN201810192399 A CN 201810192399A CN 108400448 B CN108400448 B CN 108400448B
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- resistive film
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- 235000009508 confectionery Nutrition 0.000 title claims abstract description 37
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 6
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 6
- 230000000737 periodic effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Classifications
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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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Aerials With Secondary Devices (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a candy type metamaterial wave absorber which comprises a plurality of wave absorbing units continuously arranged along a plane, wherein each wave absorbing unit comprises a square medium substrate, a square resistive film and a candy type resistive film, the square medium substrate is formed by overlapping a first PET layer, an FR-4 layer, a PMMA layer and a second PET layer medium which are the same in size from top to bottom, the square resistive film is attached to the lower side of a medium layer and is the same in size with the medium layer, and the candy type resistive film is attached to the upper side of the medium layer. The widths of all parts of the candy type resistance film are the same, the candy type resistance film is positioned right above the dielectric substrate, and the geometric center positions of the candy type resistance film and the dielectric substrate are superposed. The whole candy type resistive film is of an axisymmetric structure and consists of two sections of arcs with equal length, four sections of short arms with equal length connected with two ends of the arcs and two long arms with equal length connected with and vertical to the four short arms. The invention has high absorptivity, wide working frequency band and stable absorptivity to the oblique incident electromagnetic wave.
Description
Technical Field
The invention belongs to the field of electromagnetic waves and novel artificial electromagnetic materials, and particularly relates to a candy type metamaterial wave absorber.
Background
The wave-absorbing technology mainly utilizes a wave-absorbing material to effectively absorb incident electromagnetic waves and scatter and attenuate the incident electromagnetic waves, and the incident electromagnetic waves are converted into heat energy or other energy through various loss mechanisms of the material so as to achieve the purpose of absorbing the electromagnetic waves.
The metamaterial wave absorber is a structural wave absorber, a wave absorbing array is formed by periodic wave absorbing units, each wave absorbing unit is generally of a sandwich structure and consists of a metal pattern on the top layer, a medium substrate on the middle layer and a metal short wire or a grounding plate on the bottom layer. The performance of the metamaterial wave absorber depends on the geometric shape, the size, the arrangement and the like to a great extent, so that the metamaterial equivalent electromagnetic parameters can be flexibly regulated and controlled by designing the parameters, and further the actual requirements are met.
However, the absorption bandwidth of the metamaterial wave absorber is still far from the bandwidth required by practical application, and widening the absorption band is an urgent need in practical application. In recent years, much research has been conducted on the broadband of metamaterial absorbers. The common methods are three methods of a unit combination method, a coherent phase cancellation method based on multilayer media and a method of enhancing loss by loading lumped elements.
Yang Jing refined et al propose a wave absorber composed of metamaterial and magnetic material in the design of P-band wave absorber based on metamaterial and magnetic material, which realizes the low frequency of the wave absorber by electromagnetic coupling technology, but has the problems of low absorption peak and narrow working bandwidth.
According to the effective medium theory, the medium layer is used as an important component of the metamaterial structure, and the design of the multilayer structure is an effective means for improving the absorption bandwidth of the metamaterial. The multi-layer design theory of the wave-absorbing material is applied to the design of the broadband metamaterial, the metamaterials with different structures are used in different layers according to the impedance matching principle, the electromagnetic waves in different frequency bands and the metamaterial structures in different layers are resonated by adjusting the equivalent dielectric constant and the equivalent permeability of each layer of metamaterial structure, the electromagnetic waves are incident layer by layer and absorbed sequentially, and the purpose of broadband absorption is finally achieved.
Disclosure of Invention
The invention aims to provide a candy type metamaterial wave absorber, which solves the problems that the existing metamaterial wave absorber is low in absorption rate, narrow in working frequency band, unstable in absorption rate of oblique incident electromagnetic waves and the like.
The technical solution for realizing the purpose of the invention is as follows: a wave absorber for candy type metamaterial is of an infinite periodic structure and comprises N-M wave absorbing units which are sequentially connected and arrayed, wherein N represents the number of columns, M represents the number of rows, N is larger than or equal to 2, M is larger than or equal to 1, each wave absorbing unit comprises a candy type resistive film, a square dielectric substrate and a square resistive film, the candy type resistive film, the square dielectric substrate and the square resistive film are sequentially arranged from top to bottom, the square dielectric substrate comprises a first PET layer, an FR-4 layer, a PMMA layer and a second PET layer, the candy type resistive film is sprayed on the top surface of the first PET layer, and the square resistive film is sprayed on the bottom surface of the second PET layer.
The candy type resistive film is in an axisymmetric structure, and the geometric center of the candy type resistive film is superposed with the geometric center of the medium substrate.
The candy type resistive film comprises two arcs with equal length, four short arms with equal length and two long arms with equal length, wherein the openings of the two arcs are opposite and symmetrically arranged at intervals, two ends of the arc are respectively connected with one ends of the two short arms with equal length, the two long arms with equal length are respectively connected with the two short arms positioned at the same end and on different arcs, and the widths of the arcs, the short arms and the long arms are the same.
The length of the long arm is larger than the distance between the two short arms which are positioned at the same end and on different circular arcs.
Compared with the prior art, the invention has the remarkable advantages that: (1) the absorption rate is high; (2) the working frequency band is wide; (3) the absorption rate of the obliquely incident electromagnetic wave is stable; (4) simple structure and easy manufacture.
Drawings
FIG. 1 is a schematic structural diagram of a wave absorbing unit of the candy type metamaterial wave absorber.
FIG. 2 is a structural plan view of a wave absorbing unit of the candy type metamaterial wave absorber.
FIG. 3 is a side view of a wave absorbing unit of the candy type metamaterial wave absorber.
FIG. 4 is a graph showing the result of the absorption rate simulation of the sugar-type metamaterial absorber of the present invention when electromagnetic waves are incident perpendicularly.
FIG. 5 is a graph showing the simulation result of the absorption rate of the candy-type metamaterial wave absorber of the present invention to TM waves under different incident angles.
FIG. 6 is a graph showing the results of TE wave absorption rate simulation of the candy-type metamaterial wave absorber of the present invention under different incident angles.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
The candy type metamaterial wave absorber is of an infinite periodic structure and comprises N-M wave absorbing units which are sequentially connected and arranged, wherein N represents the number of columns, M represents the number of rows, N is more than or equal to 2, and M is more than or equal to 1.
As shown in fig. 1, 2 and 3, each wave absorbing unit comprises a candy resistive film 1, a square dielectric substrate 2 and a square resistive film 3 which are sequentially arranged from top to bottom, the square dielectric substrate 2 comprises a first PET layer 21, an FR-4 layer 22, a PMMA layer 23 and a second PET layer 24 which are sequentially arranged from top to bottom, wherein the candy resistive film 1 is sprayed on the top surface of the first PET layer 21, and the square resistive film 3 is sprayed on the bottom surface of the second PET layer 24.
The candy type resistive film 1 is in an axisymmetric structure, and the geometric center of the candy type resistive film 1 is superposed with the geometric center of the dielectric substrate 2. The candy type resistive film 1 comprises two arcs 1-1 with equal length, four short arms 1-2 with equal length and two long arms 1-3 with equal length, the openings of the two arcs 1-1 are opposite and symmetrically arranged at intervals, two ends of the arc 1-1 are respectively connected with one ends of the two short arms 1-2 with equal length, the two long arms 1-3 with equal length are respectively connected with the two short arms 1-2 which are positioned at the same end and on different arcs 1-1, and the widths of the arc 1-1, the short arms 1-2 and the long arms 1-3 are the same.
The length of the long arm 1-3 is larger than the distance between two short arms 1-2 which are positioned at the same end and on different arcs 1-1.
The dielectric constant of the first PET layer 21 and the second PET layer 24 in the dielectric substrate 2 is r13.0, loss tangent t d10.06. The dielectric constant of the FR-4 layer 22 in the dielectric substrate 2 is r24.4, loss tangent t d20.02. The PMMA layer 23 in the dielectric substrate 2 has the dielectric constant of r32.25, loss tangent t d3＝0.001。
Example 1
The candy type metamaterial wave absorber is of an infinite periodic structure and comprises N-M wave absorbing units which are sequentially connected and arranged, and each layer of the wave absorbing unit has the following structural size parameters: the side length p of the wave absorbing unit is 13mm, and the thickness h of the candy type resistive film 1 1The square resistance R of the candy resistive film 1 is 100 Ω, 0.175 mm. The line width s of the candy type resistance film 1 is 0.5mm, the outer diameter r of the circular arc 1-1 is 3.9mm, the length n of the short arm 1-2 is 1.3mm, and the length m of the long arm 1-3 is 5 mm. The first PET layer 21 and the second PET layer 24 have the same thickness, the thickness h 2Thickness h of FR-4 layer 22 of 0.175mm 3Thickness h of PMMA layer 23 of 0.85mm 4＝2.25mm。
The simulation results are shown in fig. 4, 5 and 6, and the candy-type metamaterial wave absorber provided by the invention has the following advantages:
1. High absorption rate: the peak value of the absorption rate of the invention at 11.42GHz is 100.0%, and the absorption rate of the wave absorber is above 90% at the frequency band of 7.31GHz-15.20 GHz; the absorptivity is above 99% in the frequency band of 10.24GHz-12.57 GHz. Has the characteristic of perfect wave absorption.
2. The working frequency bandwidth is wide: the absorption rate of the invention exceeds 90%, the relative wave-absorbing bandwidth can reach 69.1%, and the working frequency bandwidth is wide.
3. The absorption rate of the electromagnetic wave with oblique incidence is stable: in the process that the incident angle degree gradually increases, the frequency corresponding to the absorption peak of the wave absorber has rightward shift, but the bandwidth of the absorption rate of more than 99% can be ensured to exceed 2GHz, the relative bandwidth of the absorption rate of more than 90% is ensured to exceed 60%, and the wave absorber has good stability.
4. Simple structure and easy manufacture.
In conclusion, the working frequency band of the candy type metamaterial wave absorber completely covers the X wave band and partially covers the Ku wave band, can perfectly absorb electromagnetic waves of a specific wave band, and has great application value in the aspects of detection, invisibility and the like of an X wave band radar.
Claims (3)
1. The utility model provides a candy type metamaterial wave absorber, adopts infinite periodic structure, including N M wave absorbing unit that connects gradually the range, wherein N represents the column number, and M represents the line number, and N is greater than or equal to 2, and M is greater than or equal to 1, its characterized in that: the wave absorbing unit comprises a candy type resistive film (1), a square dielectric substrate (2) and a square resistive film (3) which are sequentially arranged from top to bottom, the square dielectric substrate (2) comprises a first PET layer (21), an FR-4 layer (22), a PMMA layer (23) and a second PET layer (24) which are sequentially arranged from top to bottom, wherein the candy type resistive film (1) is sprayed on the top surface of the first PET layer (21), and the square resistive film (3) is sprayed on the bottom surface of the second PET layer (24);
The candy-type resistive film (1) comprises two arcs (1-1) with equal length, four short arms (1-2) with equal length and two long arms (1-3) with equal length, wherein the openings of the two arcs (1-1) are opposite and symmetrically arranged at intervals, two ends of the arc (1-1) are respectively connected with one ends of the two short arms (1-2) with equal length, the two long arms (1-3) with equal length are respectively connected with the two short arms (1-2) which are positioned at the same end and on different arcs (1-1), and the widths of the arc (1-1), the short arms (1-2) and the long arms (1-3) are the same.
2. The candy-type metamaterial wave absorber of claim 1, wherein: the candy type resistive film (1) is in an axisymmetric structure, and the geometric center of the candy type resistive film coincides with the geometric center of the dielectric substrate (2).
3. The candy-type metamaterial wave absorber of claim 1, wherein: the length of the long arm (1-3) is larger than the distance between two short arms (1-2) which are positioned at the same end and on different arcs (1-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810192399.6A CN108400448B (en) | 2018-03-09 | 2018-03-09 | Candy type metamaterial wave absorber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810192399.6A CN108400448B (en) | 2018-03-09 | 2018-03-09 | Candy type metamaterial wave absorber |
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| Publication Number | Publication Date |
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| CN108400448A CN108400448A (en) | 2018-08-14 |
| CN108400448B true CN108400448B (en) | 2020-07-31 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110366361A (en) * | 2019-08-06 | 2019-10-22 | 集美大学 | A kind of wave absorbing device based on super surface |
| CN113329607B (en) * | 2021-05-31 | 2022-08-02 | 中国人民解放军空军工程大学 | Novel ultra-wideband wave absorbing unit and wave absorbing structure thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130117585A (en) * | 2012-04-18 | 2013-10-28 | 현대자동차주식회사 | Antenna for shielding electromagnetic wave |
| CN107093804A (en) * | 2017-04-27 | 2017-08-25 | 南京大学 | A kind of adjustable artificial electromagnetic absorbing meta-material of Wideband for loading water droplet |
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2018
- 2018-03-09 CN CN201810192399.6A patent/CN108400448B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130117585A (en) * | 2012-04-18 | 2013-10-28 | 현대자동차주식회사 | Antenna for shielding electromagnetic wave |
| CN107093804A (en) * | 2017-04-27 | 2017-08-25 | 南京大学 | A kind of adjustable artificial electromagnetic absorbing meta-material of Wideband for loading water droplet |
Non-Patent Citations (2)
| Title |
|---|
| An ultrathin wide-band planar metamaterial absorber based on fractal FSS and resistive film;Yongzhi Cheng et al.;《Chinese Physical B》;20140602;1-7 * |
| 糖果型电阻膜宽带超材料吸波器的设计;杨一 等;《微波学报》;20181222;17-21 * |
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