CN112886267A

CN112886267A - Electromagnetic reflective film

Info

Publication number: CN112886267A
Application number: CN201911198770.0A
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 conductive layer and a refraction layer arranged on the conductive layer, wherein a convex structure is arranged on the surface of the conductive layer close to one side of the refraction layer, the convex structure comprises a plurality of convex parts arranged at intervals, and the refraction layer is used for deflecting electromagnetic waves when the electromagnetic waves pass through the refraction layer. The electromagnetic reflection film enables electromagnetic waves to be refracted on the refraction layer and reflected and diffused on the conductive layer in sequence by arranging the refraction layer on the conductive layer, changes the original propagation direction and propagation angle of the electromagnetic waves, and further enhances the reception of the electromagnetic waves within a specified range.

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 are transmitted and then propagated to a corresponding area along a straight line, and signals are received by a receiving device. Some receiving devices are affected by the area position or the receiving angle, cannot receive signals or receive weak signals, and affect the communication quality.

Disclosure of Invention

The invention aims to provide an electromagnetic reflection film which can enable electromagnetic waves to be refracted on a refraction layer and reflected and diffused on a conductive layer in sequence, and change the original propagation direction and propagation angle of the electromagnetic waves.

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

the electromagnetic reflection film comprises a conducting layer and a refraction layer arranged on the conducting layer, wherein the conducting layer is close to one side of the refraction layer, a protruding structure is arranged on the surface of the one side of the refraction layer and comprises a plurality of convex parts arranged at intervals, and the refraction layer is used for enabling electromagnetic waves to penetrate through deflection during the refraction layer.

Furthermore, along at least one direction parallel to the surface of the conducting layer, the distance between adjacent convex parts is a reflection distance, and the reflection distances are arranged in a trend that the middle part is large and the two sides are small.

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

Further, the refraction layer comprises a substrate and an artificial microstructure arranged on the substrate, wherein the artificial microstructure is a planar structure or a three-dimensional structure formed by at least one metal wire.

Further, the artificial microstructures are arranged in a combination of one or more of a 'field' shape, an 'I' shape, a 'mouth' shape, a snowflake shape and a pyramid shape.

Further, the refraction layer includes a plurality of sub-refraction sheets stacked in a vertical direction of the conductive layer.

Further, along at least one direction of the sub-refraction sheet, the refractive index of the sub-refraction sheet gradually increases from the middle to both sides.

Furthermore, an adhesive film layer is arranged between the conducting layer and the refraction layer, the protruding structure is embedded in the adhesive film layer, and the refraction layer is connected with the surface of one side, far away from the conducting layer, of the adhesive film layer.

Further, the shape of 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 refraction layer is arranged on the conductive layer, so that incident electromagnetic waves are refracted on the refraction layer and reflected and diffused on the conductive layer in sequence, and the original propagation direction and propagation angle of the electromagnetic waves are changed. Through the control to electromagnetic wave propagation direction and angle, implement the electromagnetic wave shielding to some areas that have electromagnetic interference resistance needs, strengthen its signal strength to some areas that need to receive the electromagnetic wave, promote communication quality.

Drawings

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

Fig. 2 is a plan view of a sub-refractive sheet according to an embodiment of the present invention.

Fig. 3 is a schematic distribution diagram of the protruding structures according to an embodiment of the present invention.

Fig. 4 is a schematic distribution diagram of a protruding structure according to another embodiment of the present invention.

Fig. 5 is a schematic diagram of an electromagnetic wave propagation path according to an embodiment of the present invention.

In the figure:

1. a conductive layer; 10. a protruding structure; 2. a refractive layer; 20. a substrate; 21. an artificial microstructure; 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 and 5, the electromagnetic reflective film provided by the present invention includes a conductive layer 1 and a refractive layer 2 disposed on the conductive layer 1, wherein a protruding structure 10 is disposed on a surface of the conductive layer 1 close to the refractive layer 2, the protruding structure 10 includes a plurality of protrusions disposed at intervals, and the refractive layer 2 is used for deflecting electromagnetic waves when the electromagnetic waves pass through the refractive layer 2. It is understood that an electromagnetic wave used in radio communication cannot penetrate the conductive layer 1, and when the electromagnetic wave is incident on the surface of the conductive layer 1, the electromagnetic wave is reflected; when an electromagnetic wave is incident on the protruding structures 10 on the conductive layer 1, the electromagnetic wave is diffusely reflected. The refractive layer 2 is a material capable of propagating electromagnetic waves, and has an uneven refractive index inside, and when the electromagnetic waves pass through the refractive layer 2, the electromagnetic waves are deflected from the side with the smaller refractive index to the side with the larger refractive index, so that the propagation path of the electromagnetic waves is changed. The electromagnetic reflection film of the present embodiment is formed by disposing the refraction layer 2 on the conductive layer 1, and disposing the projection structure 10 on the conductive layer 1 on the side close to the refraction layer 2. Referring to fig. 5, when an electromagnetic wave is incident on the electromagnetic reflection film, the electromagnetic wave first passes through the refraction layer 2 to be deflected in the propagation direction. The electromagnetic wave reaching the conductive layer 1 is reflected and diffusely reflected, changes its propagation direction, and propagates toward the refractive layer 2 side. The reflected electromagnetic wave passes through the refraction layer 2 again, and the propagation direction is deflected again. The propagation direction and the propagation angle of the electromagnetic wave are changed after reflection, diffuse reflection and refraction.

Specifically, in at least one direction parallel to the surface of the conductive layer 1, the pitch between adjacent convex portions is a reflection pitch, and a plurality of reflection pitches are arranged in a tendency that the middle portion is large and both sides are small. It can be understood that the intervals of the convex portions along the surface of the conductive layer 1 are different, so that the degree of diffuse reflection is different in each area of the surface of the conductive layer 1, the diffuse reflection is relatively strong in the area where the convex portions are densely distributed, and the diffuse reflection is relatively weak in the area where the convex portions are sparsely distributed. By controlling the density of the distribution of the convex parts on the surface of the conductive layer 1, the diffuse reflection can be selectively generated in some areas or different degrees of the diffuse reflection can be generated in each area. In this embodiment, along at least one direction of the surface of the conductive layer 1, the plurality of reflection pitches tend to be larger in the middle and smaller in the two sides, preferably along the length direction and the width direction of the surface of the conductive layer 1, the convex parts in the middle area are distributed sparsely, the occurrence of diffuse reflection is relatively weak, the convex parts in the side area are distributed densely, the occurrence of diffuse reflection is relatively strong, the propagation direction of the electromagnetic wave at the side part is more dispersed after the electromagnetic wave passes through the surface of the conductive layer 1 for reflection, and the propagation range of the electromagnetic wave can be further expanded.

In one embodiment, as shown in fig. 3, a plurality of protrusions are spirally distributed on the surface of the conductive layer 1. It is understood that the electromagnetic wave propagates from the side of the refractive layer 2 to the side of the conductive layer 1, is reflected through the refractive layer 2 to the surface of the conductive layer 1, and then propagates outward through the refractive layer 2 again, and the protruding structure 10 is provided on the surface of the conductive layer 1 near the side of the refractive layer 2. The convex portions of the convex structure 10 are distributed in a spiral shape, and when electromagnetic waves are incident on the surface of the conductive layer 1, a spiral diffuse reflection distribution band is formed. The electromagnetic waves after reflection and diffuse reflection intersect each other along the surface of the conductive layer 1, so that the electromagnetic waves are uniformly dispersed in the corresponding region.

In another embodiment, as shown in fig. 4, the protruding structure 10 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 circle distribution mode can lead the electromagnetic wave to be distributed in a ring shape at intervals after the electromagnetic wave is reflected and diffused on the surface of the conducting layer 1, and lead the electromagnetic wave to be uniformly dispersed in the corresponding area.

As shown in fig. 2, the refraction layer 2 includes a substrate 20 and an artificial microstructure 21 disposed on the substrate 20, and the artificial microstructure 21 is a planar structure or a three-dimensional structure composed of at least one metal wire.

Specifically, the artificial microstructures 21 are arranged in a combination of one or more of a "field" shape, an "I" shape, a "mouth" shape, a snowflake shape, or a pyramid shape. For example: when the artificial microstructure 21 is in a "field" shape, it includes two mutually perpendicular first wires and second wires disposed at both ends of each first wire, and the second wires are perpendicular to the corresponding first wires. It is understood that the artificial microstructure 21 is a planar structure or a three-dimensional structure composed of at least one metal wire. The artificial microstructures 21 may be in the shape of "i", "ten", "mouth", triangle, polygon, irregular snowflake, tree, and pyramid. In the present embodiment, the artificial microstructures 21 are in the shape of a "field", and the substrate 20 corresponding to each artificial microstructure 21 forms a unit cell. Since the electromagnetic response of the artificial microstructure 21 is largely determined by the structural features and structural dimensions of the metal wire, the dimension of the "field" shaped metal wire gradually increases from the middle to both sides in the transverse direction shown in fig. 2, and thus the refractive index of the sub-refractive piece gradually increases from the middle to both sides.

Of course, in other embodiments, the refractive index of the sub-refraction sheet can be changed by changing the structural characteristics of the artificial microstructure 21, for example, the metal wire in the middle portion is arranged in a "mouth" shape, the metal wire in the adjacent outer side is arranged in a "tubular" shape, the metal wire in the outer side is arranged in a "field" shape, and so on, the topological characteristics of the pattern of the metal wire are changed layer by layer from the middle portion to the two sides.

Specifically, the artificial microstructures 21 are formed on the substrate 20 by means of etching. Of course, in other embodiments, electroplating, drilling, photolithography, electronic lithography, etc. may also be used.

Specifically, the refractive layer 2 includes a plurality of sub-refractive sheets, which are stacked in a vertical direction of the conductive layer 1. The vertical direction of the conductive layer 1 is the vertical direction of the surface of the conductive layer 1 close to the refraction layer 2. It will be understood that the refractive layer 2 is formed by stacking a plurality of sub-refractive sheets, each of which includes a substrate 20 and a plurality of artificial microstructures 21 disposed on the substrate 20. The sub-refraction sheet is a novel material which takes the artificial microstructures 21 as basic units, is spatially arranged in a specific manner and has special electromagnetic response, and each sub-refraction sheet comprises a substrate 20 and a plurality of artificial microstructures 21 on the substrate 20. The part occupied by each artificial microstructure 21 and the corresponding substrate 20 is called a cell, the materials of the substrate 20 and the artificial microstructures 21 are different, and after the two materials are superposed, each cell generates an equivalent dielectric constant and magnetic permeability. Wherein the equivalent permittivity and permeability correspond to the electromagnetic response and the magnetic response of the cell, respectively. The artificial microstructures 21 have different shapes or sizes so that the electromagnetic response of the sub-refractive sheet is changed, and thus the propagation direction of the electromagnetic wave is deflected when the electromagnetic wave passes through the sub-refractive sheet. In the present embodiment, a plurality of sub-refracting sheets are stacked and arranged on the surface of the conductive layer 1, and since the angle of refraction of the electromagnetic wave through the refracting layer 2 is related to the thickness of the refracting layer 2 and the change in refractive index of the material itself, when passing through the plurality of sub-refracting sheets at the same time, the position where the electromagnetic wave passes through the refracting layer 2 is deviated more greatly by the increase in thickness of the refracting layer 2.

Specifically, the refractive index of the sub-refractive sheet gradually increases from the middle to both sides in at least one direction of the sub-refractive sheet. It can be understood that the electromagnetic wave is deflected to the side having a large refractive index when passing through the sub-refractive sheet. In this embodiment, the refractive index gradually increases from the middle to both sides, so that the electromagnetic wave is deflected to both sides, thereby expanding the propagation range of the electromagnetic wave.

Specifically, a glue film layer 3 is further arranged between the conducting layer 1 and the refraction layer 2, the protrusion structure 10 is embedded in the glue film layer 3, and the refraction layer 2 and the glue film layer 3 are connected with the surface of one side far away from the conducting layer 1. It can be understood that, the conductive layer 1 is thin and provided with the protruding structure 10, so that the conductive layer 1 is easy to deform or the surface has the defects of concavity, convexity and the like, and the provision of the adhesive film layer 3 can protect the protruding structure 10, improve the overall strength of the conductive layer 1, and improve the usability of the conductive layer 1. Meanwhile, the adhesive film layer 3 is arranged between the conducting layer 1 and the refraction layer 2, so that the flatness of the connecting surface is improved, and the conducting layer 1 is favorably connected with the refraction layer 2.

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 conductive layer 1 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 conductive layer 1 is required to have conductivity and electromagnetic shielding performance. The material of the conductive layer 1 is one or a combination of more of copper, nickel, silver, gold, tin, zinc, lead, chromium and molybdenum, or a conductive rubber material, or other conductive materials. In this embodiment, the conductive layer 1 is a metal layer, preferably a copper foil.

The remarkable effects of the embodiment are as follows: the electromagnetic reflection film is characterized in that the refraction layer 2 is arranged on the conducting layer 1, and the convex structure 10 is arranged on one side of the conducting layer 1 close to the refraction layer 2, so that when electromagnetic waves enter the electromagnetic reflection film, the electromagnetic waves firstly pass through the refraction layer 2 to deflect the propagation direction of the electromagnetic waves. The electromagnetic wave reaching the conductive layer 1 is reflected and diffusely reflected, changes its propagation direction, and propagates toward the refractive layer 2 side. The reflected electromagnetic wave passes through the refraction layer 2 again, and the propagation direction is deflected again. The propagation direction and the propagation angle of the electromagnetic wave are changed after reflection, diffuse reflection and refraction.

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 utility model provides an electromagnetic reflection membrane, its characterized in that, including conducting layer (1) with set up in refraction layer (2) on conducting layer (1), conducting layer (1) is close to be equipped with salient structure (10) on the surface of refraction layer (2) one side, salient structure (10) are including the convex part that a plurality of intervals set up, refraction layer (2) are used for making the electromagnetic wave pass take place the deflection during refraction layer (2).

2. The film according to claim 1, wherein, in at least one direction parallel to the surface of the conductive layer (1), the pitch between adjacent projections is a reflection pitch, and a plurality of the reflection pitches are arranged in a tendency that the center portion is large and both sides are small.

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

4. The film according to claim 1, wherein the protruding structure (10) comprises a plurality of structural groups formed by annularly arranging the protruding portions, and the structural groups are arranged at intervals and concentrically arranged at the center.

5. The film according to claim 1, wherein the refractive layer (2) comprises a substrate (20) and an artificial microstructure (21) disposed on the substrate (20), and the artificial microstructure (21) is a planar structure or a three-dimensional structure composed of at least one metal wire.

6. The electromagnetic reflective film according to claim 5, wherein the artificial microstructures (21) are arranged in a combination of one or more of a "field" shape, an "I" shape, a "mouth" shape, a snowflake shape, or a pyramid shape.

7. The film according to claim 5, wherein the refractive layer (2) comprises a plurality of sub-refractive sheets stacked in a vertical direction of the conductive layer (1).

8. The film of claim 7, wherein the refractive index of the sub-refractive sheet increases from the middle to both sides in at least one direction of the sub-refractive sheet.

9. The electromagnetic reflection film according to claim 1, wherein a glue film layer (3) is further disposed between the conductive layer (1) and the refraction layer (2), the protrusion structure (10) is embedded in the glue film layer (3), and the refraction layer (2) is connected to a surface of the glue film layer (3) on a side away from the conductive layer (1).

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