CN210537247U - Electromagnetic shielding structure - Google Patents
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- CN210537247U CN210537247U CN201921391423.5U CN201921391423U CN210537247U CN 210537247 U CN210537247 U CN 210537247U CN 201921391423 U CN201921391423 U CN 201921391423U CN 210537247 U CN210537247 U CN 210537247U
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Abstract
The utility model discloses an electromagnetic shielding structure, which comprises a conductive cloth layer and a multilayer overlapping structure layer, wherein the upper surface of the multilayer overlapping structure layer is superposed on the lower surface of the conductive cloth layer; the multilayer overlapped structure layer comprises a plurality of absorption material layers and a plurality of resistance type periodic structure layers; the absorbing material layer is overlapped with the resistance type periodic structure layer; the upper surface and the lower surface of the multilayer overlapped structure layer are resistance type periodic structure layers, and the square resistance of the resistance type periodic structure layers in the multilayer overlapped structure layer is gradually reduced from top to bottom. The electromagnetic shielding structure provided by the utility model has a shielding effect of more than 50dB on the electromagnetic wave of 8-40 GHz, namely, only one hundred thousand of the electromagnetic waves incident from the front can penetrate through the electromagnetic wave; in addition, the electromagnetic shielding structure has a good electromagnetic wave absorption effect, and has an absorption and attenuation effect on the electromagnetic waves which are obliquely incident and penetrate when being applied to the electromagnetic shielding clothes.
Description
Technical Field
The utility model belongs to the technical field of the electromagnetic shield technique and specifically relates to an electromagnetic shield structure.
Background
With the rapid development of current scientific technology, the influence of electromagnetic radiation on human health is more recognized and paid attention to, and national standards clearly indicate that electromagnetic radiation may induce human body to produce cancer, cardiovascular diseases and the like. For the working posts exposed in strong electromagnetic radiation environment for a long time, the development of an efficient electromagnetic shielding structure is urgent.
Most of the electromagnetic shielding structures in the current market are made of single blended conductive cloth, although the conductivity is good, the mechanical and flexible properties are insufficient, a non-conductive gap exists, and the shielding effect on high-frequency electromagnetic waves is poor; when the electromagnetic wave shielding clothes are applied to the electromagnetic shielding clothes, the obliquely incident electromagnetic wave can more easily enter the shielding clothes through the positions such as gaps and the like, and oscillation is generated between a human body and the purely conductive shielding clothes, so that the electromagnetic wave is completely absorbed by the human body, and the human body is more seriously harmed; in addition, in order to ensure good conductivity and electromagnetic shielding performance, the plating layer is generally thick (the plating layer of the electromagnetic shielding structure on the market is generally dozens of micrometers or even hundreds of micrometers thick), and the plating layer is very easy to fall off, so that the mechanical property of the cloth is greatly influenced, and the wearing comfort of a human body is poor.
Disclosure of Invention
The utility model provides an electromagnetic shielding structure for overcome the defect among the prior art, realize that electromagnetic shielding structure has the compliance of clothing, and shield effectually, have the performance of absorbing the electromagnetic wave simultaneously.
In order to achieve the above object, the present invention provides an electromagnetic shielding structure, which includes an overlapped conductive cloth layer and a multi-layer overlapped structure layer, wherein the upper surface of the multi-layer overlapped structure layer is fixedly connected to the lower surface of the conductive cloth layer;
the multilayer overlapped structure layer comprises a plurality of absorption material layers and a plurality of resistance type periodic structure layers, wherein the absorption material layers and the resistance type periodic structure layers are alternately laminated together; the upper surface and the lower surface of the multilayer overlapped structure layer are resistance type periodic structure layers, and the square resistance of the resistance type periodic structure layers in the multilayer overlapped structure layer is gradually reduced from top to bottom.
Preferably, the conductive cloth layer is of a double-layer structure and comprises metal fiber blended base cloth and a conductive coating; the conductive coating is a coating of metallic nickel or copper, and the thickness of the coating is nano-scale; the thickness of the conductive cloth layer is 0.5-1.5 mm, and the sheet resistance is 0.01-0.1 omega/□.
Preferably, the absorbing material layer is a foam layer containing carbon powder, and the foam layer containing carbon powder is mainly formed by foaming carbon slurry and polyurethane; the thickness of the absorbing material layer is 2-10 mm, and the square resistance is 500-3000 omega/□.
Preferably, the number of layers of the absorbing material layer in the electromagnetic shielding structure is less than 5.
Preferably, the resistance type periodic structure layer is one of periodic capacitive frequency selective surfaces with different sheet resistances; the periodic capacitive frequency selective surface is prepared from light base cloth and conductive carbon paste through a screen printing mode.
Preferably, the three periodic capacitive frequency selective surfaces with different sheet resistances are respectively:
a periodic capacitive frequency selection surface with a sheet resistance of 500-1000 omega/□;
a periodic capacitive frequency selection surface with a square resistance of 200-300 omega/□;
a periodic capacitive frequency selective surface with a sheet resistance of 50-300 Ω/□.
Preferably, the periodic capacitive frequency selective surface is formed by orderly arranging a plurality of geometric figures; the geometric figure is a light base cloth coated with conductive carbon slurry on the surface; the conductive carbon slurry mainly comprises resin and carbon powder, wherein the content of the carbon powder is 20-50%, and the content of the resin is 30-50%.
Preferably, the geometric figures on the upper surface of the multilayer overlapping structure layer are squares with the side length of 5-10 mm, the gap between any two geometric figures is 5-10 mm, and the distance between the geometric figures distributed on the edge of the light base cloth and the edge of the light base cloth is 2-5 mm; the geometric figures on the lower surface are squares with the side length of 15-25 mm, the gap between any two geometric figures is 1-4 mm, and the distance between the geometric figures distributed on the edge of the light base cloth and the edge of the light base cloth is 1-2 mm.
Preferably, the square resistance of the upper surface resistance type periodic structure layer of the multilayer overlapped structure layer is 500-1000 Ω/□, the square resistance of the middle layer resistance type periodic structure layer is 200-300 Ω/□, and the square resistance of the lower surface resistance type periodic structure layer is 50-300 Ω/□.
Preferably, the total thickness of the electromagnetic shielding structure is 5-20 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a conductive cloth on the surface layer of the flexible electromagnetic shielding structure, which is used for reflecting and shielding low-frequency (below 1 GHz) electromagnetic waves with front incidence and partial oblique incidence; the multilayer overlapped structure layer of the inner layer comprises a plurality of absorption material layers and resistance type periodic structure layers which are alternately laminated together, the upper surface and the lower surface of the multilayer overlapped structure layer are both resistance type periodic structure layers, and the sheet resistance of the resistance type periodic structure layers in the multilayer overlapped structure layer is gradually reduced from top to bottom; the square resistance of the resistance type periodic structure layer is large, and electromagnetic waves easily penetrate into the resistance type periodic structure layer to be absorbed; the square resistance of the resistance type periodic structure layer is small, and electromagnetic waves are easily reflected and shielded by the resistance type periodic structure layer; therefore, the design of the multilayer overlapping structure layer of the utility model enables the electromagnetic wave penetrating through the surface layer conductive fabric to be absorbed by the upper surface of the inner multilayer overlapping structure layer and enter the multilayer overlapping structure layer, thereby avoiding the electromagnetic wave penetrating through the surface layer conductive fabric to directly contact with the human body; the electromagnetic wave entering the multilayer overlapped structure layer is absorbed by the upper surface resistance type periodic structure layer, the electromagnetic wave penetrating through the resistance type periodic structure layer is absorbed by the next absorption material layer, the electromagnetic wave penetrating through the absorption material layer is reflected and absorbed by the next resistance type periodic structure layer, the electromagnetic wave penetrating through the resistance type periodic structure layer is absorbed by the next absorption material layer, the reflected part of the electromagnetic wave is absorbed by the upper absorption material layer, and the electromagnetic wave penetrating through the absorption material layer is absorbed and reflected by the upper surface resistance type periodic structure layer; therefore, the electromagnetic wave can be gradually absorbed in the multilayer overlapping structure layer of the utility model; the utility model provides an electromagnetic wave shielding effect of electromagnetic shield structure 8 ~ 40GHz reaches more than 50dB, and the electromagnetic wave of positive incidence only one hundred thousand promptly can pierce through, and to the electromagnetic wave of other direction incidences the utility model provides a structure also can play fine shielding effect to effectively reduce the harm of electromagnetic wave to the human body.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic front structural view of an electromagnetic shielding structure provided by the present invention;
fig. 2a is a schematic top surface view of the resistive periodic structure layer provided by the present invention;
fig. 2b is a schematic lower surface view of the resistive periodic structure layer provided by the present invention;
FIG. 3a is a graph showing the absorption efficiency of the multi-layer overlapped structure layer of the embodiment 1 of the present invention for electromagnetic waves with frequency of 1-18 GHz;
FIG. 3b is a graph showing the absorption efficiency of the multi-layer overlapped structure layer of the embodiment 1 of the present invention for electromagnetic waves with a frequency of 26.5 to 40 GHz;
fig. 4a is a shielding effectiveness curve of the electromagnetic shielding structure for 8 to 18GHz electromagnetic waves in embodiment 1 of the present invention;
fig. 4b is a shielding effectiveness curve of the electromagnetic shielding structure for 18 to 40GHz electromagnetic waves according to embodiment 1 of the present invention;
the reference numbers illustrate: 1, a conductive cloth layer; 11 metal fiber blended base cloth; 12, conducting plating; 2a layer of absorbent material; 3 resistance type periodic structure layer; 31 a periodic capacitive frequency selective surface; 311 geometric figure.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The drugs/reagents used are all commercially available without specific mention.
The utility model provides an electromagnetic shielding structure, as shown in fig. 1, the electromagnetic shielding structure comprises a conductive cloth layer and a multilayer overlapping structure layer which are superposed, wherein the upper surface of the multilayer overlapping structure layer is fixedly connected to the lower surface of the conductive cloth layer;
the multilayer overlapped structure layer comprises a plurality of absorption material layers and a plurality of resistance type periodic structure layers, wherein the absorption material layers and the resistance type periodic structure layers are alternately laminated together; the upper surface and the lower surface of the multilayer overlapped structure layer are resistance type periodic structure layers, and the square resistance of the resistance type periodic structure layers in the multilayer overlapped structure layer is gradually reduced from top to bottom.
A plurality of layers are overlapped, namely one absorbing material layer, one resistance type periodic structure layer, one absorbing material layer, one resistance type periodic structure layer and the like are alternately stacked.
The utility model discloses an electromagnetic shield structure passes through the structural design of multilayer for this electromagnetic shield structure can shield the electromagnetic wave through reflection and absorption mechanism simultaneously, has very efficient electromagnetic shield performance, is applied to the electromagnetic shield clothes after, can not only shield the electromagnetic wave of positive incidence and oblique incidence, also has the absorption loss effect to the electromagnetic wave through gap infiltration, effectively reduces the electromagnetic wave absorption of human body to the infiltration.
Preferably, the conductive cloth layer is of a double-layer structure and comprises metal fiber blended base cloth and a conductive coating, the conductive coating is a coating of metal nickel or copper, and the thickness of the coating is nanoscale, so that the coating is prevented from being easily dropped due to the fact that the coating is thick; the thickness of the conductive cloth layer is 0.5-1.5 mm, and the sheet resistance is 0.01-0.1 omega/□. The surface layer conductive cloth is used for shielding electromagnetic waves incident from the front and partially incident obliquely and reducing the energy of the electromagnetic waves in direct contact with a human body. In addition, the metal fiber blended fabric is used as the base fabric, so that the flexibility of the structure is increased.
Preferably, the absorbing material layer is a foam layer containing carbon powder, and the foam layer containing carbon powder is mainly formed by foaming carbon slurry and polyurethane; the thickness of the absorbing material layer is 2-10 mm, preferably 3-5 mm, and the sheet resistance is 500-3000 omega/□. The absorption material layer is used for improving the whole electromagnetic shielding efficiency and can absorb and attenuate the electromagnetic wave energy contacting with the human body.
The absorbing material layer comprises carbon slurry, polyurethane, xylene, butyl ester and a foaming auxiliary agent, wherein the mass ratio of carbon powder to polyurethane to xylene to butyl ester to the foaming auxiliary agent is (10-30): (40-60): (10-30): (1-5).
Preferably, the number of layers of the absorbing material layer in the electromagnetic shielding structure is 5 or less, and the number of layers of the absorbing material layer is controlled to prevent too many absorbing material layers from causing poor flexibility of the final structure.
Preferably, the resistance type periodic structure layer is one of periodic capacitive frequency selective surfaces with different sheet resistances; the periodic capacitive frequency selective surface is prepared from light base cloth and conductive carbon paste through a screen printing mode.
Preferably, the three periodic capacitive frequency selective surfaces with different sheet resistances comprise:
a periodic capacitive frequency selection surface with a sheet resistance of 500-1000 omega/□;
a periodic capacitive frequency selection surface with a square resistance of 200-300 omega/□;
a periodic capacitive frequency selective surface with a sheet resistance of 50-300 Ω/□.
Different sheet resistances are arranged on different layers of the resistance type periodic structure layer so as to enhance the shielding of electromagnetic waves with different frequencies.
Preferably, the periodic capacitive frequency selective surface is formed by an ordered arrangement of several geometric figures, as shown in fig. 2a and 2 b; the geometric figure is a light base cloth coated with conductive carbon slurry on the surface; the conductive carbon slurry mainly comprises resin and carbon powder, wherein the content of the carbon powder is 20-50%, and the content of the resin is 30-50%; the resin is polyurethane. The lightweight base fabric facilitates reducing the weight and increasing the softness of the final structure; the carbon in the conductive carbon paste is used for reflecting electromagnetic waves, and the resin is used for coating carbon powder on the surface of the light base cloth. In the preparation process of the conductive carbon paste, besides resin and carbon powder, a solvent (such as dimethylbenzene and butyl ester) and a foaming auxiliary agent are added. The geometric figure can be any shape such as a square, a rectangle, a circle and the like.
Preferably, a plurality of geometric figures on the upper surface (shown in figure 2a) of the multi-layer overlapped structure layer are squares with the side length a of 5-10 mm, the gap b between any two geometric figures is 5-10 mm, and the distance c between the geometric figures distributed on the edge of the light base cloth and the edge of the light base cloth is 2-5 mm; the geometric figures on the lower surface (figure 2b) are squares with the side length d of 15-25 mm, the gap e between any two geometric figures is 1-4 mm, and the distance f between the geometric figures distributed on the edge of the light base fabric and the edge of the light base fabric is 1-2 mm. The sheet resistance of the periodic capacitive frequency selective surface is controlled by the design of the geometric figure area.
Preferably, the square resistance of the upper surface resistance type periodic structure layer of the multilayer overlapped structure layer is 500-1000 omega/□, the square resistance of the middle layer resistance type periodic structure layer is 200-300 omega/□, the square resistance of the lower surface resistance type periodic structure layer is 50-300 omega/□, and the method is realized by blade coating conductive carbon paste with different conductivity and specific thickness. This is designed to improve the absorption shielding performance against high-frequency electromagnetic waves.
Preferably, the total thickness of the electromagnetic shielding structure is 5-20 mm, and the thickness of the electromagnetic shielding structure is controlled to reduce the weight of the structure and increase the comfort level of the structure.
Example 1
The present embodiment provides an electromagnetic shielding structure, as shown in fig. 1, including a surface conductive fabric layer 1 and an inner multi-layer overlapping structure layer, where an upper surface of the multi-layer overlapping structure layer is stacked on a lower surface of the conductive fabric layer 1;
the multilayer overlapped structure layer comprises two absorbing material layers 2 and three resistance type periodic structure layers 3; the absorbing material layer 2 is overlapped with the resistance type periodic structure layer 3; the upper surface and the lower surface of the multilayer overlapped structure layer are both resistance type periodic structure layers 3 which are respectively a high-impedance surface and a low-impedance surface.
The thickness of the conductive cloth layer 1 is about 1mm, and the sheet resistance is 0.02 omega/□. The conductive cloth layer 1 comprises a metal fiber blended base cloth 11 and a conductive plating layer 12.
The absorbing material layer 2 is prepared by mixing carbon powder, polyurethane, dimethylbenzene, butyl ester and a foaming auxiliary agent according to the mass ratio of 25:45:12:15:3, foaming in a mold to obtain foam containing carbon powder, and cutting the foam into slices with the thickness of 4mm, namely the absorbing material layer 2.
Preparing a resistance type periodic structure layer:
(1) designing the shape of a geometric figure according to an electromagnetic simulation result, and determining the sheet resistance of the upper surface resistance type periodic structure layer and the lower surface resistance type periodic structure layer of the multilayer overlapped structure layer;
(2) preparing conductive carbon paste A and B:
a: 60 g of carbon powder, 200 g of polyurethane, 100 g of dimethylbenzene and 50 g of butyl ester are uniformly stirred to prepare the polyurethane adhesive;
b: uniformly stirring 100 g of carbon powder, 150 g of polyurethane, 100 g of dimethylbenzene and 50 g of butyl ester to prepare the polyurethane adhesive;
(3) high-impedance geometric figures (a resistance type periodic structure layer positioned on the upper surface of the multilayer overlapped structure layer adopts a high-impedance geometric figure, the side length a of each square is 5-10 mm, the gap b between every two geometric figures is 5-10 mm, and the distance c between each geometric figure and the edge of the light base fabric is 2-5 mm), conductive carbon slurry A is adopted for blade coating for 5 times, and each blade coating is dried in an oven at 60 ℃;
carrying out blade coating on a low-impedance geometric figure (a resistance type periodic structural layer positioned on the lower surface of the multilayer overlapped structural layer, wherein the resistance type periodic structural layer is low in impedance, the side length d is a square of 15-25 mm, the gap e between the geometric figures is 1-4 mm, and the distance f between the geometric figures and the edge of the light base fabric is 1-2 mm) by using conductive carbon paste B for 12 times, and drying the conductive carbon paste B in an oven at 60 ℃ every time of blade coating;
the finally formed high-impedance geometric square resistance is 500 omega/□, the low-impedance geometric square resistance is 100 omega/□ and 250 omega/□, and the surface impedance uniformity is below 10%.
The electromagnetic shielding structure comprises 2 absorbing material layers 2 and 3 resistance type periodic structure layers 3, the thickness of a single absorbing material layer is 5mm, the upper surface (one resistance type periodic structure layer) of the multilayer overlapped structure layer is a high-impedance surface, the square resistance is 500 omega/□, the lower surface (one resistance type periodic structure layer) of the multilayer overlapped structure layer and the resistance type periodic structure layer superposed between the two absorbing material layers are low-impedance surfaces, and the square resistance is 100 omega/□ and 250 omega/□ respectively.
Fig. 3a and 3b are graphs illustrating the absorption efficiency of the multi-layer overlapped structure layer to electromagnetic waves in this embodiment, and it can be seen from fig. 3a and 3b that the average absorption attenuation efficiency of the multi-layer overlapped structure layer to electromagnetic waves of 1 to 8GHz is more than 10dB, and the absorption effect of the multi-layer overlapped structure layer to electromagnetic waves of 1 to 8GHz is good.
Fig. 4a and 4b are the shielding effectiveness curves of the electromagnetic shielding structure to the electromagnetic waves of 8-40 GHz in this embodiment, and it can be seen from fig. 4a and 4b that the electromagnetic shielding structure has a shielding effect to the electromagnetic waves of 8-40 GHz reaching more than 50dB, i.e. only one hundred thousandth of the incident electromagnetic waves on the front side can penetrate through, which illustrates that the electromagnetic shielding structure provided by the utility model has a good absorption effect to the high-frequency electromagnetic waves.
The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. An electromagnetic shielding structure is characterized by comprising a conductive cloth layer and a plurality of overlapped structure layers which are overlapped, wherein the upper surfaces of the plurality of overlapped structure layers are fixedly connected to the lower surfaces of the conductive cloth layer;
the multilayer overlapped structure layer comprises a plurality of absorption material layers and a plurality of resistance type periodic structure layers, wherein the absorption material layers and the resistance type periodic structure layers are alternately laminated together; the upper surface and the lower surface of the multilayer overlapped structure layer are resistance type periodic structure layers, and the square resistance of the resistance type periodic structure layers in the multilayer overlapped structure layer is gradually reduced from top to bottom.
2. The electromagnetic shielding structure of claim 1, wherein the conductive fabric layer is a double-layer structure comprising a metal fiber blended base fabric and a conductive plating layer; the conductive coating is a coating of metallic nickel or copper, and the thickness of the coating is nano-scale; the thickness of the conductive cloth layer is 0.5-1.5 mm, and the sheet resistance is 0.01-0.1 omega/□.
3. The electromagnetic shielding structure of claim 1, wherein the absorbing material layer is a carbon powder-containing foam layer, the carbon powder-containing foam layer being mainly formed by foaming carbon slurry and polyurethane; the thickness of the absorbing material layer is 2-10 mm, and the square resistance is 500-3000 omega/□.
4. The electromagnetic shielding structure according to claim 1 or 3, wherein the number of layers of the absorbing material layer in the electromagnetic shielding structure is 5 or less.
5. The electromagnetic shielding structure of claim 1 wherein said resistive periodic structure layer is one of three periodic capacitive frequency selective surfaces having different sheet resistances; the periodic capacitive frequency selective surface is prepared from light base cloth and conductive carbon paste through a screen printing mode.
6. The electromagnetic shielding structure of claim 5 wherein the periodic capacitive frequency selective surfaces of three different sheet resistances are:
a periodic capacitive frequency selection surface with a sheet resistance of 500-1000 omega/□;
a periodic capacitive frequency selection surface with a square resistance of 200-300 omega/□;
a periodic capacitive frequency selective surface with a sheet resistance of 50-300 Ω/□.
7. An electromagnetic shielding structure according to claim 5 or 6 wherein said periodic capacitive frequency selective surface is formed by an ordered arrangement of geometric shapes; the geometric figure is a light base cloth coated with conductive carbon slurry on the surface; the conductive carbon slurry mainly comprises resin and carbon powder, wherein the content of the carbon powder is 20-50%, and the content of the resin is 30-50%.
8. The electromagnetic shielding structure of claim 1, wherein the geometric figures on the upper surface of the multi-layer overlapping structure layer are squares with a side length of 5-10 mm, a gap between any two geometric figures is 5-10 mm, and a distance between the geometric figures distributed on the edge of the light base fabric and the edge of the light base fabric is 2-5 mm; the geometric figures on the lower surface are squares with the side length of 15-25 mm, the gap between any two geometric figures is 1-4 mm, and the distance between the geometric figures distributed on the edge of the light base cloth and the edge of the light base cloth is 1-2 mm.
9. The EMI shielding structure as claimed in claim 1 or 8, wherein the square resistance of the upper surface resistance type periodic structure layer of said multi-layer overlapped structure layer is 500-1000 Ω/□, the square resistance of the middle layer resistance type periodic structure layer is 200-300 Ω/□, and the square resistance of the lower surface resistance type periodic structure layer is 50-300 Ω/□.
10. The electromagnetic shielding structure of claim 1, wherein the electromagnetic shielding structure has a total thickness of 5 to 20 mm.
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| CN201921391423.5U CN210537247U (en) | 2019-08-26 | 2019-08-26 | Electromagnetic shielding structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020294A (en) * | 2020-08-05 | 2020-12-01 | 深圳市佳晨科技有限公司 | Ultra-wide spectrum wave-absorbing material and preparation method thereof |
| CN112437599A (en) * | 2019-08-26 | 2021-03-02 | 上海戎科特种装备有限公司 | Electromagnetic shielding structure |
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2019
- 2019-08-26 CN CN201921391423.5U patent/CN210537247U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112437599A (en) * | 2019-08-26 | 2021-03-02 | 上海戎科特种装备有限公司 | Electromagnetic shielding structure |
| CN112020294A (en) * | 2020-08-05 | 2020-12-01 | 深圳市佳晨科技有限公司 | Ultra-wide spectrum wave-absorbing material and preparation method thereof |
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