CN117794220B - Electromagnetic shielding structure based on metamaterial - Google Patents
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- CN117794220B CN117794220B CN202410211487.1A CN202410211487A CN117794220B CN 117794220 B CN117794220 B CN 117794220B CN 202410211487 A CN202410211487 A CN 202410211487A CN 117794220 B CN117794220 B CN 117794220B
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- 239000002184 metal Substances 0.000 claims abstract description 104
- 229910052751 metal Inorganic materials 0.000 claims abstract description 104
- 239000000463 material Substances 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 229920001721 polyimide Polymers 0.000 description 7
- 239000004642 Polyimide Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of electromagnetic shielding, and provides an electromagnetic shielding structure based on a metamaterial, which comprises the following components: a first metamaterial layer, an insulating layer and a second metamaterial layer which are sequentially stacked; the corresponding electromagnetic shielding layer is obtained by designing parameters such as metal wire period, metal wire width and the like of the upper metamaterial layer and the lower metamaterial layer, the electromagnetic shielding layer is of a metal mesh periodic structure formed by unit structures of the second metamaterial layer and the first metamaterial layer, the unit structures of the second metamaterial layer and the first metamaterial layer are arranged in parallel, the arrangement period is consistent, the line width of a metal wire on the first metamaterial layer is larger than that of a metal wire on the second metamaterial layer, the vertical projection of the metal wire on the second metamaterial layer on the first metamaterial layer falls in the metal wire of the first metamaterial layer, a shielding wave band is achieved to cover a P wave band (230-1000 MHz) and lower frequency bands, and the electromagnetic shielding wave band has high shielding efficiency under the conditions of different polarization angles and incidence angles.
Description
Technical Field
The embodiment of the invention relates to the technical field of electromagnetic shielding, in particular to an electromagnetic shielding structure based on a metamaterial.
Background
Along with the continuous improvement of the level of electronization, the attention to the problem of electromagnetic compatibility is increasingly high, and electromagnetic interference can not only influence the normal operation of electronic equipment, but also possibly cause a certain threat to the health of people. In the field of electromagnetic compatibility, electromagnetic shielding is an important means for inhibiting electromagnetic interference, and the shielding body can play a role in absorbing, reflecting or guiding electromagnetic waves, so that the damage to equipment caused by the penetration of the electromagnetic waves is reduced. And the radiation source can be effectively isolated into the shielding body or the sensitive facilities can be isolated from the external radiation source by adopting a shielding means, so that the function of protecting the sensitive facilities is achieved. Therefore, it is necessary to perform reasonable electromagnetic shielding structural design based on metamaterials.
Electromagnetic metamaterials have shown excellent properties as a composite material designed and manufactured manually, materials can be created by artificially manufactured structural units with specific properties and functions, and can be customized in terms of shape, size and units, and interactions between them can be designed, compared with traditional electromagnetic shielding materials, with electromagnetic regulation and control characteristics. In the prior art, the shielding research is mostly focused on high-frequency and millimeter wave frequency bands, and the structure of electromagnetic shielding of P-band (230-1000 MHz) and lower frequency cannot give consideration to multi-angle incidence, so that the shielding effect is not ideal.
Disclosure of Invention
The invention provides an electromagnetic shielding structure based on a metamaterial, which can cover a P wave band (230-1000 MHz) and lower frequency bands by shielding wave bands, and has higher shielding effectiveness under the conditions of different polarization angles and incidence angles.
The embodiment of the invention provides an electromagnetic shielding structure based on a metamaterial, which comprises the following components: a first metamaterial layer, an insulating layer and a second metamaterial layer which are sequentially stacked;
The first metamaterial layer and the second metamaterial layer respectively comprise a plurality of unit structures which are arranged periodically; the unit structures are periodically arranged in N multiplied by N, and N is a positive integer greater than 1;
the unit structure comprises a metal wire in a first direction and a metal wire in a second direction, wherein the first direction is intersected with the second direction; in the first direction, the metal lines in the first direction in the unit structures which are on the same layer and are adjacent are on the same straight line and are connected with each other; in the second direction, the metal lines in the second direction in the unit structures which are on the same layer and are adjacent are on the same straight line and are connected with each other;
Wherein the line width of the metal line on the first metamaterial layer is larger than the line width of the metal line on the second metamaterial layer; a perpendicular projection of the metal lines on the second metamaterial layer onto the first metamaterial layer falls within the metal lines on the first metamaterial layer.
Optionally, the first direction is perpendicular to the second direction.
Optionally, in the first metamaterial layer, a distance between adjacent metal lines in the first direction and the second direction is 2-3mm, a width of each metal line is 0.2-0.8mm, a thickness of each metal line is 0.01-0.05mm, and a period of the unit structure of the first metamaterial layer in the first direction and the second direction is 4-6mm.
Optionally, in the first direction and the second direction in the second metamaterial layer, a distance between adjacent metal wires is 2-3mm, a width of each metal wire is 0.1-0.4mm, a thickness of each metal wire is 0.01-0.05mm, and a period of the unit structure of the second metamaterial layer in the first direction and the second direction is 4-6mm.
Optionally, in the first metamaterial layer, a distance between adjacent metal lines in the first direction and the second direction is 2.6mm, a width of the metal lines is 0.6mm, a thickness of the metal lines is 0.035mm, and a period of the unit structure of the first metamaterial layer in the first direction and the second direction is 5.2mm;
The spacing between adjacent metal lines in the first direction and the second direction in the second metamaterial layer is 2.6mm, the width of the metal lines is 0.4mm, the thickness of the metal lines is 0.035mm, and the period of the unit structures of the second metamaterial layer in the first direction and the second direction is 5.2mm.
Optionally, the material of the first metamaterial layer and the second metamaterial layer is copper.
Optionally, the metamaterial-based electromagnetic shielding structure further comprises a dielectric layer, and the dielectric layer is arranged on one side, far away from the insulating layer, of the first metamaterial layer.
Optionally, the dielectric layer is made of a non-transparent electromagnetic shielding material.
Optionally, the electromagnetic shielding material comprises a carbon fiber, carbonyl iron or polyether-ether-ketone ternary electromagnetic double-loss composite material.
Optionally, the thickness of the insulating layer is 0.025mm, and the thickness of the dielectric layer is 2.5 mm.
According to the metamaterial-based electromagnetic shielding structure provided by the embodiment of the invention, the electromagnetic shielding layer meeting the requirements is obtained by designing the parameters such as the metal wire period, the metal wire width and the like of the upper metamaterial layer and the lower metamaterial layer, the electromagnetic shielding layer is of a metal mesh periodic structure formed by the unit structures of the second metamaterial layer and the first metamaterial layer, wherein the unit structures of the second metamaterial layer and the first metamaterial layer are arranged in parallel, the arrangement period is kept consistent, the line width of the metal wire on the first metamaterial layer is larger than that of the metal wire on the second metamaterial layer, the vertical projection of the metal wire on the second metamaterial layer on the first metamaterial layer falls in the metal wire on the first metamaterial layer, the shielding performance is improved by utilizing the metal mesh periodic structure, the shielding wave band covers a P wave band (230-1000 MHz) and lower frequency bands, and the shielding efficiency is higher under the conditions of different polarization angles and incidence angles, when the incidence electromagnetic wave is in a 75-degree angle with the vertical direction, the shielding efficiency is stable, the optimal shielding effect is achieved, and the requirement of the low-frequency-bandwidth metamaterial is met.
Drawings
Fig. 1 is a schematic cross-sectional structure of an electromagnetic shielding structure based on a metamaterial according to an embodiment of the present invention;
Fig. 2 is a schematic top view of an electromagnetic shielding structure based on metamaterial according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a unit structure according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another unit structure according to an embodiment of the present invention;
Fig. 5 is a schematic top view of another electromagnetic shielding structure based on metamaterial according to an embodiment of the present invention;
FIG. 6 is a schematic top view of another electromagnetic shielding structure based on metamaterial according to an embodiment of the present invention;
FIG. 7 is a graph showing electromagnetic shielding effectiveness at different polarization angles from 150KHz to 1000 MHz;
FIG. 8 is a graph showing electromagnetic shielding effectiveness at different incident angles of 150KHz-1000MHz according to the present invention;
fig. 9 is a schematic cross-sectional structure of another electromagnetic shielding structure based on metamaterial according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic cross-sectional structure of an electromagnetic shielding structure based on a metamaterial according to an embodiment of the present invention, and fig. 2 is a schematic top view structure of an electromagnetic shielding structure based on a metamaterial according to an embodiment of the present invention, referring to fig. 1 and fig. 2, including: a first metamaterial layer 110, an insulating layer 120 and a second metamaterial layer 130 which are sequentially stacked;
the first metamaterial layer 110 and the second metamaterial layer 130 respectively comprise a plurality of unit structures 111 which are periodically arranged; the unit structures 111 are periodically arranged in n×n, where N is a positive integer greater than 1;
the cell structure 111 includes a metal line 112 in a first direction X and a metal line 112 in a second direction Y, the first direction X intersecting the second direction Y; in the first direction X, the metal lines 112 in the first direction X in the same-layer and adjacent cell structures 111 are on the same line and connected to each other; in the second direction Y, the metal lines 112 in the second direction Y in the same-layer and adjacent cell structures 111 are on the same straight line and are connected to each other;
Wherein, the line width of the metal line 112 on the first metamaterial layer 110 is larger than the line width of the metal line 112 on the second metamaterial layer 130; the perpendicular projection of the metal lines 112 on the second metamaterial layer 130 onto the first metamaterial layer 110 falls within the metal lines 112 on the first metamaterial layer 110.
Specifically, the second metamaterial layer 130 and the first metamaterial layer 110 are respectively disposed on the upper and lower surfaces of the insulating layer, and the second metamaterial layer 130 and the first metamaterial layer 110 are respectively composed of the unit structures 111. The unit structure 111 is a cross-like structure formed by intersecting the metal lines 112 in the first direction X and the metal lines 112 in the second direction Y. The angle of intersection of the first direction X and the second direction Y is not limited herein. For example, fig. 3 is a schematic structural diagram of a unit structure according to an embodiment of the present invention, referring to fig. 3, metal lines 112 in unit structure 111 may be vertically intersected to form a metal grid structure as shown in fig. 2. Fig. 4 is a schematic structural diagram of another unit structure according to an embodiment of the present invention, referring to fig. 4, metal lines 112 in the unit structure 111 may intersect at an acute angle to form a schematic structural diagram of a top view of another metamaterial-based electromagnetic shielding structure as shown in fig. 5.
Referring to fig. 2 or 5, the metal lines 112 in the first direction X in the same-layer and adjacent cell structures 111 are all on the same straight line and are integrally connected, and the metal lines 112 in the second direction Y in the same-layer and adjacent cell structures 111 are all on the same straight line and are integrally connected. That is, by periodically arranging the unit structures 111 of the same layer, the second metamaterial layer 130 and the first metamaterial layer 110 can respectively form an uninterrupted integrated metal grid structure, and the integrated structure is more stable and more convenient to process in the process of processing. Wherein two adjacent cell structures 111 in the first direction X and two adjacent cell structures 111 in the second direction Y may form the smallest periodic unit, i.e., the cell structures 111 are arranged in 2×2 periods. Thus, the unit structures 111 may be periodically arranged in n×n numbers according to the size of the shielding space to be applied, to form a metal mesh grid periodic structure. The periodic metamaterial layer provided by the embodiment of the invention prepares the metal grid on the substrate through the flexible circuit board printing process, the method can realize the manufacture of the large-area high-precision metal grid only by one process step, the material utilization rate is approximately 100%, expensive equipment and dies are not needed, the preparation process is mature and stable, the automatic production can be realized, the efficiency is high, and the material utilization rate is high. The material cost is controllable, and the whole preparation process is mature and stable.
In the embodiment of the present invention, the unit structures 111 of the second metamaterial layer 130 and the first metamaterial layer 110 are arranged in parallel, the arrangement period is kept consistent, the line width of the metal line 112 on the first metamaterial layer 110 is larger than the line width of the metal line 112 on the second metamaterial layer 130, and the vertical projection of the metal line 112 on the second metamaterial layer 130 on the first metamaterial layer 110 falls into the metal line 112 on the first metamaterial layer 110. That is, the grid in the metal grid structure composed of the unit structures 111 in the second metamaterial layer 130 is on the same vertical line as the grid center point in the metal grid structure composed of the unit structures 111 in the first metamaterial layer 110. The orthographic projection of the metal lines 112 in the second metamaterial layer 130 falls into the orthographic projection of the metal lines 112 in the first metamaterial layer 110.
According to the metamaterial-based electromagnetic shielding structure provided by the embodiment of the invention, the electromagnetic shielding layer meeting the requirements is obtained by designing the metal wire period, the metal wire width and other parameters of the upper metamaterial layer and the lower metamaterial layer, the electromagnetic shielding layer is of a metal mesh grid periodic structure formed by the unit structures of the second metamaterial layer and the first metamaterial layer, wherein the unit structures of the second metamaterial layer and the first metamaterial layer are arranged in parallel, the arrangement period is kept consistent, the line width of the metal wire on the first metamaterial layer is larger than that of the metal wire on the second metamaterial layer, the vertical projection of the metal wire on the second metamaterial layer on the first metamaterial layer falls in the metal wire on the first metamaterial layer, the shielding performance is improved by utilizing the metal mesh grid periodic structure, the shielding wave band covers a P wave band (230-1000 MHz) and lower frequency bands, and the shielding efficiency is higher under the conditions of different polarization angles and incidence angles, when the incidence electromagnetic wave forms a 75-degree angle with the vertical direction, the shielding efficiency is stable, the optimal shielding effect is achieved, and the requirement of low-frequency metamaterial shielding wide angle is met.
In some embodiments, fig. 6 is a schematic top view of another electromagnetic shielding structure based on metamaterial according to an embodiment of the present invention, referring to fig. 6, the first direction X is perpendicular to the second direction Y, the unit structures 111 of the same layer form a metal mesh periodic structure with square grids, such that the spacing between adjacent metal lines 112 in the first direction X and the second direction Y in the second metamaterial layer 130 is K1, the width of the metal line 112 in the second metamaterial layer 130 is d1, the thickness of the metal line 112 in the second metamaterial layer 130 is h1, and the period of the unit structures 111 of the second metamaterial layer 130 in the first direction X and the second direction Y is P. Wherein, the range of K1 is 2-3mm, the range of d1 is 0.1-0.4mm, the range of h1 is 0.01-0.05mm, and the range of P is 4-6mm.
Let the distance between adjacent metal lines 112 in the first and second directions X and Y of the first metamaterial layer 110 be K2, the width of the metal line 112 of the first metamaterial layer 110 be d2, the thickness of the metal line 112 of the first metamaterial layer 110 be h2, and the period of the unit structure 111 of the first metamaterial layer 110 in the first and second directions X and Y be P, wherein K2 ranges from 2 to 3mm, d2 ranges from 0.2 to 0.8mm, h2 ranges from 0.01 to 0.05mm, and the value of P ranges from 4 to 6mm. Note that, the pitch between the metal lines 112 refers to a vertical distance between respective centerlines in the length direction of the metal lines 112.
The metal lines 112 in the second metamaterial layer 130 and the first metamaterial layer 110 are made of the same material, for example, copper, and are optimized, and in this embodiment, each parameter is specifically set as follows: d1 is 0.4mm, h1 is 0.035mm, and K1 is 2.6mm. d2 is 0.6mm, h2 is 0.035mm and K2 is 2.6mm. The period p of both the second metamaterial layer 130 and the first metamaterial layer 110 is 5.2mm. Fig. 7 is a schematic diagram of electromagnetic shielding effectiveness at different polarization angles under 150KHz-1000MHz, fig. 8 is a schematic diagram of electromagnetic shielding effectiveness at different incidence angles under 150KHz-1000MHz, referring to fig. 7 and 8, according to the designed metamaterial metal unit structure 111, electromagnetic shielding effectiveness SE can be greater than 51dB in a low frequency range of 150KHz-1000MHz, namely electromagnetic shielding effectiveness reaches 99%, shielding effectiveness reaches over 70dB under the condition of being lower than 100MHz, and the shielding effectiveness is higher under the condition of different polarization angles and incidence angles, when the incident electromagnetic wave forms an angle of 75 degrees with the vertical direction, the shielding effectiveness is still stable, the optimal shielding effect is achieved, and the requirement of wide angle of low-frequency metamaterial electromagnetic shielding is met.
In some embodiments, in the electromagnetic shielding structure based on the metamaterial, the insulating layer 120 is a Polyimide film, the second metamaterial layer 130 covers the upper surface of a Polyimide (PI) substrate, and the first metamaterial layer 110 covers the lower surface of the Polyimide (PI) substrate, so as to form a laminated structure. The second metamaterial layer 130 and the first metamaterial layer 110 are processed using a laser lithography process.
Based on the above embodiment, fig. 9 is a schematic cross-sectional structure of another metamaterial-based electromagnetic shielding structure according to the embodiment of the present invention, referring to fig. 9, the metamaterial-based electromagnetic shielding structure further includes a dielectric layer 140, where the dielectric layer 140 is disposed on a side of the first metamaterial layer 110 away from the insulating layer 120.
Specifically, the dielectric layer 140 is disposed on a side of the first metamaterial layer 110 away from the insulating layer 120, and is closely attached to the surface of the first metamaterial layer 110, where the dielectric layer 140 is made of a non-transparent electromagnetic shielding material, and the dielectric layer 140 is combined with the metamaterial layer by using a material that is formed by combining an electric loss material and a magnetic loss material as the dielectric layer 140. For example, a composite carbon fiber/carbonyl iron/polyether ether ketone ternary electromagnetic double-loss composite material is selected. Based on the electromagnetic double-loss composite material, the electromagnetic shielding efficiency is effectively improved, the selected material not only has higher reflection loss at low frequency, but also can improve absorption loss, and the material has various outstanding performance advantages in the same material. The thickness of the second metamaterial layer 130 and the first metamaterial layer 110 are 0.035mm, the thickness of PI is 0.025mm, and the thickness of the dielectric layer 140 is 2.5 mm.
In some embodiments, the unit structure 111 is determined based on an equivalent circuit theory of the transmission line theory, when an electromagnetic wave is incident, a metal pattern is equivalent to a circuit model, an electromagnetic field problem in space is converted into a circuit problem, and various physical parameters related to shielding effectiveness are determined, including a period length of the unit structure 111, a thickness of the unit structure 111, a size of the unit structure 111 pattern, and the like. According to the metamaterial layer composed of the unit structure 111, electromagnetic shielding effectiveness SE is larger than 51dB in a low frequency range of 150KHz-1000MHz, namely, electromagnetic shielding effectiveness reaches 99%, and shielding effectiveness reaches more than 70dB below 100 MHz. And the designed structure has higher shielding effectiveness under the conditions of different polarization angles and wide-angle incidence. The metal grid is manufactured on the PI substrate by using a flexible circuit board printing process, the method can realize the manufacture of the large-area high-precision metal grid by only one process step, expensive equipment and a die (mask) are not needed, the manufacturing process is mature and stable, and the automatic production can be realized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An electromagnetic shielding structure based on metamaterial, comprising: a first metamaterial layer, an insulating layer and a second metamaterial layer which are sequentially stacked;
The first metamaterial layer and the second metamaterial layer respectively comprise a plurality of unit structures which are arranged periodically; the unit structures are periodically arranged in N multiplied by N, and N is a positive integer greater than 1;
the unit structure comprises a metal wire in a first direction and a metal wire in a second direction, wherein the first direction is intersected with the second direction; in the first direction, the metal lines in the first direction in the unit structures which are on the same layer and are adjacent are on the same straight line and are connected with each other; in the second direction, the metal lines in the second direction in the unit structures which are on the same layer and are adjacent are on the same straight line and are connected with each other;
Wherein the line width of the metal line on the first metamaterial layer is larger than the line width of the metal line on the second metamaterial layer; a perpendicular projection of the metal lines on the second metamaterial layer onto the first metamaterial layer falls within the metal lines on the first metamaterial layer.
2. The metamaterial-based electromagnetic shielding structure of claim 1, wherein the first direction is perpendicular to the second direction.
3. The metamaterial-based electromagnetic shielding structure according to any one of claims 1 to 2, wherein a pitch between adjacent metal lines in the first and second directions is 2 to 3mm, a width of the metal lines is 0.2 to 0.8mm, a thickness of the metal lines is 0.01 to 0.05mm, and a period of the unit structure of the first metamaterial layer in the first and second directions is 4 to 6mm.
4. A metamaterial-based electromagnetic shielding structure as claimed in claim 3, wherein a pitch between adjacent metal lines in the first direction and the second direction in the second metamaterial layer is 2-3mm, a width of the metal lines is 0.1-0.4mm, a thickness of the metal lines is 0.01-0.05mm, and a period of the unit structure of the second metamaterial layer in the first direction and the second direction is 4-6mm.
5. The metamaterial-based electromagnetic shielding structure according to claim 4, wherein a pitch between adjacent metal lines in the first and second directions is 2.6mm, a width of the metal lines is 0.6mm, a thickness of the metal lines is 0.035mm, and a period of the unit structure of the first metamaterial layer in the first and second directions is 5.2mm;
The spacing between adjacent metal lines in the first direction and the second direction in the second metamaterial layer is 2.6mm, the width of the metal lines is 0.4mm, the thickness of the metal lines is 0.035mm, and the period of the unit structures of the second metamaterial layer in the first direction and the second direction is 5.2mm.
6. The metamaterial-based electromagnetic shielding structure of claim 1, wherein the material of the first metamaterial layer and the second metamaterial layer is copper.
7. The metamaterial-based electromagnetic shielding structure of claim 6, further comprising a dielectric layer disposed on a side of the first metamaterial layer away from the insulating layer.
8. The metamaterial-based electromagnetic shielding structure as in claim 7, wherein the dielectric layer is made of a non-transparent electromagnetic shielding material.
9. The metamaterial-based electromagnetic shielding structure of claim 8, wherein the electromagnetic shielding material comprises a carbon fiber, carbonyl iron, or polyetheretherketone ternary electromagnetic double-loss composite.
10. The metamaterial-based electromagnetic shielding structure of claim 7, wherein the thickness of the insulating layer is 0.025mm and the thickness of the dielectric layer is 2.5 mm.
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