CN116507100A - High-light-transmittance metal grid electromagnetic protection device based on periodic shielding and periodic wave absorbing and parameter optimization method thereof - Google Patents
High-light-transmittance metal grid electromagnetic protection device based on periodic shielding and periodic wave absorbing and parameter optimization method thereof Download PDFInfo
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- CN116507100A CN116507100A CN202310194965.8A CN202310194965A CN116507100A CN 116507100 A CN116507100 A CN 116507100A CN 202310194965 A CN202310194965 A CN 202310194965A CN 116507100 A CN116507100 A CN 116507100A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 105
- 239000002184 metal Substances 0.000 title claims abstract description 105
- 230000000737 periodic effect Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000002834 transmittance Methods 0.000 title claims description 24
- 238000005457 optimization Methods 0.000 title abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 238000004088 simulation Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 10
- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims description 21
- 230000010355 oscillation Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 8
- 239000003989 dielectric material Substances 0.000 claims description 4
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000005083 Zinc sulfide Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 3
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 78
- 238000010586 diagram Methods 0.000 description 6
- 230000010287 polarization Effects 0.000 description 5
- 239000011358 absorbing material Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 241000132179 Eurotium medium Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
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- 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
- H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
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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
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorbing and a parameter optimization method thereof. Setting parameters of the metal grid electromagnetic protection device according to requirements during design, and carrying out modeling simulation by using simulation software; and carrying out parameter optimization on the device structure based on the simulation result until the electromagnetic protection and light transmission effects of the design are met. The invention can reduce transmission as much as possible, increase the wave absorbing performance of the structure, and match the periodic wave absorbing efficiency curve of the top metal grid layer with the periodic wave shielding efficiency curve wave crest-wave trough of the bottom metal grid layer, and the two mutually complement each other to realize the periodic complementation of electromagnetic wave absorbing and shielding.
Description
Technical Field
The invention belongs to the field of electromagnetic protection, and particularly relates to a high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption and a parameter optimization method thereof.
Background
Electromagnetic protection is to prevent electromagnetic interference generated by electronic devices and protect the inside by isolating external electromagnetic waves. Electromagnetic protection is generally achieved by using electromagnetic protection materials, which can be classified into shielding materials and absorbing materials, and electromagnetic shielding materials are materials that have strong reflection to incident electromagnetic waves. Electromagnetic wave absorbing materials refer to a class of materials that can absorb, attenuate, and convert incident electromagnetic waves into thermal energy that dissipates or causes the electromagnetic waves to disappear due to interference. For transparent light windows, not only is the performance of the electromagnetic protection material required to meet the requirements, but also additional conditions of transparency and light transmittance are required to be met.
Electromagnetic metamaterial is generally adopted to design an electromagnetic protection structure, and can effectively regulate and control the propagation mode, polarization, wavefront and the like of electromagnetic waves, and is widely applied to design and application of wave absorbers, electromagnetic shielding, polarization converters and the like at present. For the actual requirement of electromagnetic protection, the following problems to be solved are existed in the actual design: 1) Due to the influence of the thick medium, the transmission and reflection spectrum of the material has periodic oscillation, and the broadband shielding performance of the material is influenced. 2) For applications on transparent light windows, especially when it is desired to be placed inside the light window, it is not only required to reduce the transmission as much as possible, but also to have a high light transmittance of the electromagnetic shielding material.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption and the parameter optimization method thereof, which utilize a double-layer metal grid structure and simultaneously have the electromagnetic performance of periodic wave absorption and periodic wave absorption, so that the double-metal grid electromagnetic protection with the shielding efficiency of more than 10dB, the absorptivity of 0.9 and the light transmittance of 98% in the (1-18) GHz range is realized.
The specific technical scheme for realizing the purpose of the invention is as follows:
a high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption comprises a top metal grid layer, a transparent medium layer and a bottom metal grid layer;
the transparent medium layer is arranged between the top metal grid layer and the bottom metal grid layer;
the top metal grid layer is used for absorbing electromagnetic waves and reducing the reflection of the electromagnetic waves, the bottom metal grid layer is used for shielding the electromagnetic waves, and the transparent medium layer is used for carrying out repeated reflection on the electromagnetic waves so as to enable the electromagnetic waves to generate loss.
Further, the grid structures of the top metal grid layer and the bottom metal grid layer include, but are not limited to, a cross grid structure, a hexagonal grid structure, a right triangle grid structure, or an equilateral triangle grid structure.
Further, the transparent dielectric layer is a high transparency material including, but not limited to, glass, polyethylene terephthalate, zinc sulfide.
Furthermore, the transparent dielectric layer has a transmission and reflection coefficient which periodically oscillates along with the frequency of the target electromagnetic wave.
Further, the wave-absorbing efficiency curve of the top metal grid layer and the shielding efficiency curve of the bottom metal grid layer both show periodic oscillation;
and the periodic wave absorption efficiency curve and the periodic shielding efficiency curve are complementary in peak-to-peak manner.
Further, the structures of the top metal grid layer and the bottom metal grid layer are consistent, and the top metal grid layer and the bottom metal grid layer are cross-shaped grid structures;
the transparent medium layer is made of organic glass, and the thickness of the transparent medium layer is 15mm.
Further, the line width of the cross-shaped grid structure is 5 μm, the period is 200 μm, the line surface resistance of the top metal grid layer is 20Ω, and the line surface resistance of the top metal grid layer is 0.2 Ω.
Further, the parameter optimization method based on any one of the above devices comprises the following steps:
step 1, setting the structure, line width, period and line surface resistance of a top metal grid layer and a bottom metal grid layer according to requirements;
step 2, setting dielectric materials and thickness of the transparent dielectric layer according to requirements;
step 3, modeling and simulating by using CST full-wave simulation software according to the device structure parameters set in the step 1 and the step 2;
and 4, optimizing parameters of the device structure based on the simulation result until the electromagnetic protection and light transmission effects of the design are met.
Compared with the prior art, the invention has the beneficial effects that:
(1) The technical scheme of the invention provides a high-light-transmission metal grid electromagnetic protection structure device based on periodic shielding and periodic wave absorption, and the device has the electromagnetic performance of periodic wave absorption and periodic shielding, so that the wave absorption performance is improved while the transmission is as small as possible;
(2) According to the invention, through the design of the double-layer metal grid structure, the transmission is reduced as much as possible, the wave absorbing performance of the structure is increased, meanwhile, the periodic wave absorbing efficiency curve of the top-layer metal grid layer is matched with the wave crest-wave trough of the periodic shielding efficiency curve of the bottom-layer metal grid layer, and the periodic wave absorbing performance curve and the wave crest-wave trough are mutually complemented to realize the periodic complementation of electromagnetic wave absorbing and shielding.
Drawings
Fig. 1 is a schematic structural diagram of a high light transmission metal grid electromagnetic protection device of the present invention.
Fig. 2 is a schematic diagram of different metal grids in the high-transmittance metal grid electromagnetic protection device according to the embodiment of the invention.
FIG. 3 is a schematic diagram of a cross metal mesh and a single layer cross metal mesh plus transparent dielectric layer.
Fig. 4 is a schematic diagram of a transparent dielectric layer in a high-transmittance metal mesh electromagnetic shielding device according to an embodiment of the invention.
Fig. 5-8 are schematic diagrams illustrating oscillation simulation of the transflector spectrum under different conditions in the embodiment of the invention.
Fig. 9 is a schematic diagram of a graph of the transmission and reflection coefficients of periodic shielding and periodic wave absorption of the high-transmittance metal mesh electromagnetic shielding device according to an embodiment of the present invention.
Detailed Description
A high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption comprises a top metal grid layer, a transparent medium layer and a bottom metal grid layer;
the transparent medium layer is arranged between the top metal grid layer and the bottom metal grid layer;
the top metal grid layer is used for absorbing electromagnetic waves and reducing the reflection of the electromagnetic waves, the bottom metal grid layer is used for shielding the electromagnetic waves, and the transparent medium layer is used for carrying out repeated reflection on the electromagnetic waves so as to enable the electromagnetic waves to generate loss. Therefore, the technical scheme of the super-surface structure with the periodic shielding and periodic wave absorbing characteristics is realized, so that the incident electromagnetic wave is absorbed while the high transmittance is realized, the wave absorbing performance is improved, and the electromagnetic protection effect is achieved.
Further, the mesh structures of the top metal mesh layer and the bottom metal mesh layer may be the same or different, including but not limited to a cross mesh structure, a hexagonal mesh structure, a right triangle mesh structure, or an equilateral triangle mesh structure.
Further, the transparent dielectric layer is made of organic glass, indium Tin Oxide (ITO) or fluorine doped tin oxide (FTO), polyethylene terephthalate, zinc sulfide and the like.
The transparent medium layer has a transmission and reflection coefficient which periodically oscillates along with the frequency of the target electromagnetic wave, and the wave absorption efficiency curve of the top metal grid layer and the shielding efficiency curve of the bottom metal grid layer both show periodic oscillation;
and the periodic wave absorption efficiency curve and the periodic shielding efficiency curve are complementary in peak-to-peak manner.
Furthermore, since the electromagnetic protection structure is arranged in the optical window interlayer, a certain medium thickness and a higher transmittance are required, however, the periodic oscillation of the shielding effectiveness curve and the wave-absorbing effectiveness curve in the frequency band is caused by the increase of the medium thickness, so that in the scheme, the periodic wave-absorbing effectiveness curve of the top metal grid layer is matched with the wave crest-wave trough of the periodic shielding effectiveness curve of the bottom metal grid layer, and the shielding performance and the wave-absorbing performance alternately act to realize the full-frequency electromagnetic protection function.
Further, the structures of the top metal grid layer and the bottom metal grid layer are consistent, and the top metal grid layer and the bottom metal grid layer are cross-shaped grid structures;
the transparent medium layer is made of organic glass, and the thickness of the transparent medium layer is 15mm.
Further, the line width of the cross-shaped grid structure is 5 μm, the period is 200 μm, the line surface resistance of the top metal grid layer is 20Ω, and the line surface resistance of the top metal grid layer is 0.2 Ω.
The parameter optimization method based on the device comprises the following steps:
step 1, setting the structures, line widths, periods and line surface resistances of a top metal grid layer and a bottom metal grid layer according to requirements, wherein the metal grid structures of the top layer and the bottom layer can be different or same, and the shapes, the line widths and the periods of the metal grid structures directly influence the light transmittance of the structures; the line-plane resistance affects the shielding effectiveness of the grid structure; meanwhile, due to the influence of the duty ratio and the current path of different metal grid structures, the electromagnetic shielding effectiveness of the metal grid structures is different when other parameters are the same;
in general, the light transmittance of the structure is considered first, the line width and the period of the metal grid structure are strictly limited by the condition, and the metal grid structure must be designed on the premise of meeting the light transmittance of the structure;
step 2, setting dielectric materials and thickness of the transparent dielectric layer according to requirements; the dielectric material directly affects the transparency and transmittance of the structure, and the dielectric constants of different materials also affect the final stealth effect. The thickness of the medium can effectively improve the electromagnetic shielding effect, but at the same time, the light transmittance of the structure can be reduced;
step 3, modeling and simulating by using CST full-wave simulation software according to the device structure parameters set in the step 1 and the step 2; modeling the whole structure at CST, matching parameters, selecting a target frequency band by using time domain simulation, and obtaining parameters such as reflectivity parameter S11, transmissivity parameter S21 and the like of the design structure in the target frequency band, wherein the wave absorbing performance and shielding performance of the design structure can be further analyzed.
And 4, carrying out parameter optimization on the device structure based on the simulation result until the electromagnetic protection and light transmission effects of the design are met, namely, carrying out reverse parameter optimization on the wave absorbing performance and the shielding performance of the design structure so as to meet the electromagnetic protection performance.
The invention is further illustrated below with reference to examples.
Examples
Referring to fig. 1, a high-light-transmittance metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption comprises a top metal grid layer, a transparent medium layer and a bottom metal grid layer;
the transparent medium layer is arranged between the top metal grid layer and the bottom metal grid layer;
the top metal grid layer is used for absorbing electromagnetic waves and reducing the reflection of the electromagnetic waves, the bottom metal grid layer is used for shielding the electromagnetic waves, and the transparent medium layer is used for carrying out repeated reflection on the electromagnetic waves so as to enable the electromagnetic waves to generate loss. Therefore, the technical scheme of the super-surface structure with the periodic shielding and periodic wave absorbing characteristics is realized, so that the incident electromagnetic wave is absorbed while the high transmittance is realized, the wave absorbing performance is improved, and the electromagnetic protection effect is achieved.
Firstly, determining the structures of a top layer and a plating metal grid, and respectively performing simulation analysis on the periodic structures of the metal grids with 4 different shapes shown in fig. 2, namely a cross grid, a hexagonal grid, a right-angle triangular grid and an equilateral triangular grid under the condition of ensuring that the visible light transmittance is 99 percent
Firstly, the shielding effectiveness of four different metal grid structures under different polarization conditions is analyzed, the polarization angle is 0-360 degrees, step length 15 degrees is taken for simulation, and the minimum shielding effectiveness of the four different metal grids under different polarization angles is obtained, as shown in the following table:
the visible shielding effectiveness is: the equilateral triangle mesh > cross mesh > hexagonal mesh > right-angle triangle mesh, and the process drawing line preparation is comprehensively considered, and finally, the metal mesh layer structure in the embodiment is determined to be a cross-shaped mesh structure.
Secondly, the material and thickness of the transparent dielectric layer are determined, and due to the requirement of light transmittance, in this embodiment, organic glass is selected as the material of the dielectric layer, and the dielectric constant is 7-8.5.
Referring to fig. 3, for the cross metal grid without medium (i.e. medium thickness is 0) and with medium of different thickness, a single-layer metal grid is arranged on the outer side of the medium, a periodic structure simulation is set, an S21 curve, i.e. shielding effectiveness curve, is seen, periodic oscillation is brought by high dielectric constant and medium thickness, the period of oscillation of the screen effect curve is increased along with the increase of the medium thickness, the overall oscillation trend is consistent, the oscillation is carried out along the curve without medium, and the minimum value of SE is reduced; line width affects oscillation trend, SEmin, line-to-line resistance affects overall SE size, and duty cycle affects oscillation amplitude.
The dielectric constant of 8 is fixed in (1), the line surface resistance Rs=0.1, the line width w=1 μm and the light transmittance of 98%; (2) fixed dielectric constant 8, line surface resistance rs=0.1, line width w=7μm, light transmittance 98%; (3) fixed dielectric constant 8, line surface resistance rs=0.1, line width w=7μm, light transmittance 95%; (4) the dielectric constant is fixed to 8, the line surface resistance Rs=0.3, the line width w=7 μm and the light transmittance is 95% and the thickness of the medium is changed to 0mm, 5mm, 15mm, 35mm and 50mm. It can be seen that the line width affects the oscillation trend, affects Semin, the duty cycle affects the oscillation amplitude, and the line-to-line resistance affects the overall SE size, as shown in fig. 5-8.
The upper surface and the lower surface of the glass with the thickness h=15 mm and the dielectric constant of 8.5 are designed with metal grid structures with different resistances, the line width is w, the period is p, the line surface resistance of the top grid is Rs1, the line surface resistance of the bottom grid is Rs2, the simulation optimized geometric parameters are shown in the following table as a shielding layer, the transmission and reflection coefficients are shown in the table below, the shielding efficiency is more than 10dB in the (1-18) GHz range, the frequency band reflected by the dark black dotted line frame absorbs waves, the absorption rate is about 0.9, and the shielding efficiency of the frequency band transmitted by the light black dotted line frame is about-15 dB. The shielding performance and the wave absorbing performance are alternately acted to realize the full-band electromagnetic protection function by matching the wave crest and the wave trough of the wave absorbing performance oscillation curve. Thereby forming a periodic wave-absorbing + periodic shielding effect.
| w(μm) | p(μm) | Rs1(Ω/sq) | Rs2(Ω/sq) |
| 1 | 200 | 20 | 0.2 |
The foregoing embodiments illustrate and describe the basic principles, principal features of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (8)
1. The high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption is characterized by comprising a top metal grid layer, a transparent medium layer and a bottom metal grid layer;
the transparent medium layer is arranged between the top metal grid layer and the bottom metal grid layer;
the top metal grid layer is used for absorbing electromagnetic waves and reducing the reflection of the electromagnetic waves, the bottom metal grid layer is used for shielding the electromagnetic waves, and the transparent medium layer is used for carrying out repeated reflection on the electromagnetic waves so as to enable the electromagnetic waves to generate loss.
2. The high light transmission metal mesh electromagnetic shielding device based on periodic shielding and periodic wave absorbing according to claim 1, wherein the mesh structure of the top metal mesh layer and the bottom metal mesh layer includes, but is not limited to, a cross mesh structure, a hexagonal mesh structure, a right triangle mesh structure, or an equilateral triangle mesh structure.
3. The high light transmission metal mesh electromagnetic shielding device based on periodic shielding and periodic wave absorbing according to claim 1, wherein the transparent dielectric layer is a high transparency material including but not limited to glass, polyethylene terephthalate, zinc sulfide.
4. The high light transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption according to claim 1, wherein the transparent medium layer has a transmission and reflection coefficient which periodically oscillates along with the frequency of the target electromagnetic wave.
5. The high-transmittance metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption according to claim 1, wherein the wave absorption efficiency curve of the top metal grid layer and the shielding efficiency curve of the bottom metal grid layer both show periodic oscillation;
and the periodic wave absorption efficiency curve and the periodic shielding efficiency curve are complementary in peak-to-peak manner.
6. The high-light-transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorption according to claim 5, wherein the top metal grid layer and the bottom metal grid layer are consistent in structure and are of a cross-shaped grid structure;
the transparent medium layer is made of organic glass, and the thickness of the transparent medium layer is 15mm.
7. The high light transmission metal grid electromagnetic protection device based on periodic shielding and periodic wave absorbing according to claim 6, wherein the line width of the cross grid structure is 5 μm, the period is 200 μm, the line surface resistance of the top metal grid layer is 20 Ω, and the line surface resistance of the top metal grid layer is 0.2 Ω.
8. A method of optimizing parameters based on the apparatus of any one of claims 1-5, comprising the steps of:
step 1, setting the structure, line width, period and line surface resistance of a top metal grid layer and a bottom metal grid layer according to requirements;
step 2, setting dielectric materials and thickness of the transparent dielectric layer according to requirements;
step 3, modeling and simulating by using CST full-wave simulation software according to the device structure parameters set in the step 1 and the step 2;
and 4, optimizing parameters of the device structure based on the simulation result until the electromagnetic protection and light transmission effects of the design are met.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117479521A (en) * | 2023-12-27 | 2024-01-30 | 江苏赛博空间科学技术有限公司 | Electromagnetic shielding structure of wave-transparent material |
| CN117769236A (en) * | 2023-12-29 | 2024-03-26 | 江苏赛博空间科学技术有限公司 | Metal pattern functional layer structure for increasing electromagnetic wave transmission performance |
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2023
- 2023-03-02 CN CN202310194965.8A patent/CN116507100A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117479521A (en) * | 2023-12-27 | 2024-01-30 | 江苏赛博空间科学技术有限公司 | Electromagnetic shielding structure of wave-transparent material |
| CN117479521B (en) * | 2023-12-27 | 2024-05-28 | 江苏赛博空间科学技术有限公司 | Electromagnetic shielding structure of wave-transparent material |
| CN117769236A (en) * | 2023-12-29 | 2024-03-26 | 江苏赛博空间科学技术有限公司 | Metal pattern functional layer structure for increasing electromagnetic wave transmission performance |
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