CN112886268A

CN112886268A - Electromagnetic reflective film

Info

Publication number: CN112886268A
Application number: CN201911198855.9A
Authority: CN
Inventors: 苏陟; 高强
Original assignee: Guangzhou Fangbang Electronics Co Ltd
Current assignee: Guangzhou Fangbang Electronics Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2021-06-01

Abstract

The invention relates to an electromagnetic reflection film which comprises a base material, a first conducting layer and a second conducting layer, wherein the first conducting layer and the second conducting layer are arranged on two opposite surfaces of the base material, the second conducting layer is electrically connected with the first conducting layer, a protruding structure is arranged on the surface, far away from the base material, of the first conducting layer, and the protruding structure comprises a plurality of protruding parts. The electromagnetic reflection film has the advantages that the convex structures are arranged on the surface of the conductive layer, so that incident electromagnetic waves are reflected and diffused on the surface of the conductive layer, the original propagation direction of the electromagnetic waves is changed, and further, signals in some areas can be shielded and the intensity of the electromagnetic waves in a specified range can be enhanced.

Description

Electromagnetic reflective film

Technical Field

The invention relates to the technical field of communication, in particular to an electromagnetic reflecting film.

Background

In radio communication, electromagnetic waves have physical characteristics of straight line propagation. In the signal transmitting and receiving process, some areas do not need to receive electromagnetic waves for interference prevention, and some areas need to receive stronger electromagnetic waves to improve the communication quality. Therefore, there is a need for a device capable of changing the propagation direction of electromagnetic waves, which satisfies the requirements of signal shielding and signal enhancement in some areas.

Disclosure of Invention

The invention aims to provide an electromagnetic reflection film which can cause the reflection and diffuse reflection of electromagnetic waves on the surface of a conductive layer and change the original propagation direction of the electromagnetic waves.

In order to achieve the purpose, the invention adopts the following technical scheme:

the provided electromagnetic reflection film comprises a base material, a first conducting layer and a second conducting layer, wherein the first conducting layer and the second conducting layer are arranged on two opposite surfaces of the base material, the second conducting layer is electrically connected with the first conducting layer, a protruding structure is arranged on the surface, far away from the base material, of the first conducting layer, and the protruding structure comprises a plurality of protruding parts.

Furthermore, a connection hole for connecting the first conductive layer and the second conductive layer is formed in the substrate.

Further, a third conductive layer is arranged on the inner wall of the connection hole or a conductive medium is arranged in the connection hole, so that the first conductive layer and the second conductive layer are electrically connected through the third conductive layer or the conductive medium.

Further, the conductive medium is one or a combination of more of copper, nickel, silver, gold, tin, zinc, lead, chromium, molybdenum, graphite, copper paste, tin paste, carbon nanotubes and graphene.

Furthermore, a first conductor is arranged on one side, close to the substrate, of the first conducting layer and/or the second conducting layer, the first conductor is embedded in the substrate, and two ends of the first conductor are respectively connected with the first conducting layer and the second conducting layer.

Furthermore, a second conductor is arranged on one side, close to the substrate, of the first conducting layer, a third conductor is arranged on one side, close to the substrate, of the second conducting layer, the second conductor and the third conductor are both embedded in the substrate, and the second conductor is electrically connected with the third conductor.

Furthermore, the plurality of convex parts are spirally distributed on the surface of the first conducting layer.

Further, the protruding structure comprises a plurality of structure groups formed by annularly arranging the convex parts, and the structure groups are arranged at intervals and are concentric in center.

Furthermore, the electromagnetic reflection film further comprises an adhesive film layer, the adhesive film layer is arranged on the surface, far away from the base material, of the first conducting layer, and the protruding structure is embedded in the adhesive film layer.

Further, the convex part is one or a combination of more of sharp angle, granule, column, block and sphere.

Compared with the prior art, the invention has the beneficial effects that:

according to the electromagnetic reflection film, the convex structure is arranged on the surface of the conductive layer, so that incident electromagnetic waves are reflected and diffused on the surface of the conductive layer, the original propagation direction of the electromagnetic waves is changed, and signals in some areas can be shielded and the intensity of the electromagnetic waves in a specified range can be enhanced.

Drawings

Fig. 1 is a cross-sectional view of an electromagnetic reflection film according to an embodiment of the present invention.

Fig. 2 is a sectional view of an electromagnetic reflection film according to another embodiment of the present invention.

Fig. 3 is a sectional view of an electromagnetic reflection film according to still another embodiment of the present invention.

Fig. 4 is a distribution diagram of the protruding structures according to an embodiment of the present invention.

Fig. 5 is a schematic distribution diagram of a protruding structure according to another embodiment of the present invention.

In the figure:

1. a substrate; 10. a first conductive layer; 11. a second conductive layer; 12. a first electrical conductor; 13. connecting holes; 14. a third electrical conductor; 15. a second electrical conductor; 2. a protruding structure; 3. and (5) a film layer.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

As shown in fig. 1, the electromagnetic reflective film provided by the present invention includes a substrate 1, and a first conductive layer 10 and a second conductive layer 11 disposed on two opposite surfaces of the substrate 1, wherein the second conductive layer 11 is electrically connected to the first conductive layer 10. The surface of the first conductive layer 10 away from the substrate 1 is provided with a protruding structure 2, and the protruding structure 2 includes a plurality of protruding portions. It can be understood that, in radio communication, when an electromagnetic wave is incident on the surface of the first conductive layer 10, the electromagnetic wave is reflected and diffusely reflected to change its original propagation direction due to the convex structure 2 provided on the surface. In this embodiment, a first conductive layer 10 for reflecting electromagnetic waves and a second conductive layer 11 for grounding are provided on two opposite surfaces of the substrate 1, respectively. The protruding structure 2 is disposed on a side of the first conductive layer 10 away from the second conductive layer 11, and the electromagnetic wave enters from the side of the first conductive layer 10 where the protruding structure 2 is disposed. When the electromagnetic wave is reflected after being incident on the surface of the first conductive layer 10, the electromagnetic wave changes its original propagation direction and propagates in the opposite direction. The electromagnetic reflection film can block electromagnetic waves from propagating to one side of the second conductive layer 11, and plays a role of shielding signals of an area on one side of the second conductive layer 11. On the other hand, the electromagnetic wave can be reflected to the first conductive layer 10 side, and the signal intensity of the region can be enhanced. Meanwhile, the second conducting layer 11 is grounded, so that the anti-interference capability and the lightning protection capability of the electromagnetic reflecting film in the communication process are improved.

Specifically, in the present embodiment, a plurality of convex portions are disposed at intervals on the surface of the first conductive layer 10. The convex portions are spaced apart from each other so that a gap is formed between two adjacent convex portions, and when electromagnetic waves are incident on the surface of the first conductive layer 10, a part of the electromagnetic waves are incident on the convex portions and are diffusely reflected, and a part of the electromagnetic waves are incident on the gap between the convex portions and are reflected, so that the propagation direction of the electromagnetic waves is disordered, which is advantageous for expanding the propagation range of the electromagnetic waves.

Specifically, the substrate 1 is provided with a connection hole 13 for connecting the first conductive layer 10 and the second conductive layer 11. It is understood that the connection hole 13 functions to electrically connect the first conductive layer 10 and the second conductive layer 11, and thus the shape of the connection hole 13 can be flexibly selected according to the difficulty of the process. In the present embodiment, the number of the connection holes 13 is preferably four, and the connection holes are respectively located at four corners of the substrate 1 to ensure the integrity of the middle region of the first conductive layer 10, so as to facilitate the arrangement of the protruding structure 2 in the middle region.

Specifically, a third conductive layer is disposed on an inner wall of the connection hole 13, or a conductive medium is disposed in the connection hole 13, so that the first conductive layer 10 and the second conductive layer 11 are electrically connected through the third conductive layer or the conductive medium. In a specific embodiment, a third conductive layer is disposed on the inner wall of the connection hole 13, and the third conductive layer extends along the connection hole 13 to the end surface. The end face of the connection hole 13 is provided with a pad at the connection part with the first conductive layer 10 and the second conductive layer 11, so that the reliability of the electric connection between the first conductive layer 10 and the second conductive layer 11 can be ensured.

In another specific embodiment, a conductive medium is disposed in the connection hole 13, and both ends of the conductive medium are respectively in contact with the first conductive layer 10 and the second conductive layer 11 to achieve electrical connection. This way, it is possible to avoid perforating and soldering the first conductive layer 10 and the second conductive layer 11, the process is simple, and the integrity of the first conductive layer 10 can be ensured.

Specifically, the conductive medium is one or a combination of more of copper, nickel, silver, gold, tin, zinc, lead, chromium, molybdenum, graphite, copper paste, tin paste, carbon nanotubes and graphene.

In another specific embodiment, one end of the connection hole 13 penetrates through the second conductive layer 11, and the other end abuts against the first conductive layer 10. In this embodiment, the connection hole 13 penetrates through the second conductive layer 11, and the connection between the connection hole 13 and the second conductive layer 11 is soldered. The other end of the connection hole 13 abuts against the first conductive layer 10, so that a hole can be prevented from being formed on the surface of the first conductive layer 10, the integrity of the first conductive layer 10 is ensured, and the utilization area of electromagnetic wave reflection is enlarged. In other embodiments, one end of the connection hole 13 may penetrate through the second conductive layer 11, and the other end may also penetrate through the first conductive layer 10.

As shown in fig. 2, a first conductive body 12 is disposed on one side of the first conductive layer 10 and/or the second conductive layer 11 close to the substrate 1, the first conductive body 12 is embedded in the substrate 1, and two ends of the first conductive body 12 are respectively connected to the first conductive layer 10 and the second conductive layer 11. It can be understood that, the first conductor 12 is used to connect the first conductive layer 10 and the second conductive layer 11 to realize the electrical connection therebetween, which can avoid the damage to the reflective surface of the first conductive layer 10, and reduce the processes of opening the hole in the substrate 1, disposing the third conductive layer in the connection hole 13, or filling the conductive medium, thereby simplifying the structure.

In another embodiment, as shown in fig. 3, a second conductor 15 is disposed on a side of the first conductive layer 10 close to the substrate 1, a third conductor 14 is disposed on a side of the second conductive layer 11 close to the substrate 1, the second conductor 15 and the third conductor 14 are embedded in the substrate 1, and the second conductor 15 is electrically connected to the third conductor 14. The second conductor 15 and the third conductor 14 may be electrically connected in various ways, for example, two conductors are abutted against each other or a conductive material is filled between the two conductors, in this embodiment, the second conductor 15 and the third conductor 14 are provided in plural, and have a structure with a large bottom end and a small top end. The plurality of second conductors 15 and the plurality of third conductors 14 are respectively arranged on the corresponding conductive layers at intervals, and the top ends of the second conductors 15 or the third conductors 14 are inserted into the gaps between the two adjacent third conductors 14 or the two adjacent second conductors 15 corresponding to the second conductors 15 or the third conductors 14, so that the first conductive layer 10 and the second conductive layer 11 are electrically connected.

The first conductor 12, the second conductor 15, and the third conductor 14 are provided for the purpose of electrically connecting the first conductive layer 10 and the second conductive layer 11. Therefore, the shape and connection manner of each conductor are not limited to those listed in the present embodiment, and may be a wire, a bar, a column, or an irregular geometric body.

As shown in fig. 4, the plurality of protrusions are spirally distributed on the surface of the first conductive layer 10. The distribution shape of the convex parts can influence the propagation direction and the intensity distribution after electromagnetic wave reflection or diffuse reflection. The spiral distribution makes the reflection and the diffused reflection generated on the surface of the first conductive layer 10 cross each other, so that the electromagnetic wave is uniformly dispersed in a specific region.

In another embodiment, as shown in fig. 5, the protruding structure 2 includes a plurality of structural groups formed by annularly disposing protruding portions, and the plurality of structural groups are disposed at intervals and are concentric in the center. The concentric circles can make the electromagnetic wave reflect and diffuse on the surface of the first conductive layer 10 at intervals, so that the electromagnetic wave is uniformly dispersed in a specific area.

Specifically, the electromagnetic reflection film further comprises a glue film layer 3, the glue film layer 3 is arranged on the surface, far away from the substrate 1, of the first conducting layer 10, and the protruding structure 2 is embedded in the glue film layer 3. The adhesive film layer 3 is used for connecting with other parts, and the first conducting layer 10 is prevented from being in direct contact with other parts to damage the reflecting surface during installation.

Specifically, the shape of the convex part is one or a combination of more of sharp angle, granule, column, block and sphere. In the present embodiment, the convex portion functions to eliminate the smooth planar structure on the surface of the first conductive layer 10 and promote the electromagnetic wave to diffuse on the surface thereof, and thus the shape of the convex portion is not limited to one or a combination of more of a pointed shape, a granular shape, a columnar shape, a block shape, and a spherical shape. The convex part can also be an irregular three-dimensional pattern, a grain and the like. The preferred triangle-shaped cone structure of this embodiment, triangle-shaped cone structure is from its top to bottom grow gradually, reduces top structure and causes the barrier for the bottom, makes the electromagnetic wave reach the surface of convex part smoothly.

Specifically, the first conductive layer 10 and the second conductive layer 11 are required to have conductive performance and electromagnetic shielding performance. The first conductive layer 10 and the second conductive layer 11 are made of one or a combination of copper, nickel, silver, gold, tin, zinc, lead, chromium, and molybdenum, or made of a conductive rubber material, or other conductive materials. In this embodiment, the first conductive layer 10 and the second conductive layer 11 are metal layers, preferably copper foils.

The remarkable effects of the embodiment are as follows: the electromagnetic reflection film is provided with the convex structures 2 on the surface of the first conductive layer 10, so that electromagnetic waves are reflected and diffused after being incident on the surface of the first conductive layer 10, the original propagation direction of the electromagnetic waves is changed, and the electromagnetic waves are propagated to a specified area. On the one hand, the signal shielding function can be performed on the area on the side of the second conductive layer 11, and on the other hand, the signal strength on the side of the first conductive layer 10 can be enhanced. Meanwhile, the second conducting layer 11 used for grounding is arranged, so that the anti-interference capability and the lightning protection capability of the electromagnetic reflecting film in the communication process can be improved.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. The electromagnetic reflection film is characterized by comprising a substrate (1), and a first conductive layer (10) and a second conductive layer (11) which are arranged on two opposite surfaces of the substrate (1), wherein the second conductive layer (11) is electrically connected with the first conductive layer (10), a protruding structure (2) is arranged on the surface, far away from the substrate (1), of the first conductive layer (10), and the protruding structure (2) comprises a plurality of protruding parts.

2. The electromagnetic reflection film according to claim 1, wherein a connection hole (13) for connecting the first conductive layer (10) and the second conductive layer (11) is provided on the base material (1).

3. The electromagnetic reflection film according to claim 2, wherein a third conductive layer is provided on an inner wall of the connection hole (13) or a conductive medium is provided in the connection hole (13) so that the first conductive layer (10) and the second conductive layer (11) are electrically connected through the third conductive layer or the conductive medium.

4. The electromagnetic reflective film according to claim 3, wherein the conductive medium is one or more of copper, nickel, silver, gold, tin, zinc, lead, chromium, molybdenum, graphite, copper paste, tin paste, carbon nanotube, and graphene.

5. The film according to claim 1, wherein a first conductive body (12) is disposed on a side of the first conductive layer (10) and/or the second conductive layer (11) close to the substrate (1), the first conductive body (12) is embedded in the substrate (1), and two ends of the first conductive body (12) are respectively connected to the first conductive layer (10) and the second conductive layer (11).

6. The electromagnetic reflection film according to claim 1, wherein a second conductor (15) is disposed on a side of the first conductive layer (10) close to the substrate (1), a third conductor (14) is disposed on a side of the second conductive layer (11) close to the substrate (1), the second conductor (15) and the third conductor (14) are embedded in the substrate (1), and the second conductor (15) and the third conductor (14) are electrically connected.

7. The film according to claim 1, wherein the plurality of protrusions are spirally distributed on the surface of the first conductive layer (10).

8. The film according to claim 1, wherein the protruding structure (2) comprises a plurality of structural groups formed by annularly arranging the protruding portions, and the structural groups are arranged at intervals and are concentric in center.

9. The electromagnetic reflection film according to claim 1, further comprising a glue film layer (3), wherein the glue film layer (3) is disposed on a surface of the first conductive layer (10) away from the substrate (1), and the protruding structure (2) is embedded in the glue film layer (3).

10. The electromagnetic reflection film according to any one of claims 1 to 9, wherein the convex portion is one or a combination of more of a pointed shape, a granular shape, a columnar shape, a block shape, and a spherical shape.