Structure for improving electromagnetic wave transmission performance

Abstract

The utility model discloses a structure for improving the wave transmission performance of electromagnetic waves, which comprises a dielectric substrate layer, and the dielectric substrate layer comprises two basic dielectric layers and an air dielectric layer located between the two basic dielectric layers. The electromagnetic wave-transparent functional layer comprises a transparent flexible material layer, a metal pattern layer and an OCA adhesive layer, the metal pattern layer is printed on the surface of one side of the transparent flexible material layer, and the transparent flexible material layer is bonded to the surface of the outer side of the dielectric substrate layer through the OCA adhesive layer; the electromagnetic wave-transparent functional layer is printed on the side surface of the dielectric substrate layer, and the electromagnetic wave-transparent functional layer is adhered to the surface of the structure, so that the transmission amplitude of electromagnetic waves in the dielectric substrate is greatly increased in the specific electromagnetic wave incoming direction of a specific frequency band, and the dielectric substrate can be used for solving the problem of signal attenuation of a building adopting the dielectric substrate.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic communication, and relates to a structure for increasing the electromagnetic wave transmission performance. Background Art

[0002] The new generation of mobile communication technology has greatly improved in terms of rate, latency, connection number, and mobility. However, due to the increase in frequency resulting in a decrease in wavelength, many effects that were not considered in previous generations of mobile communication cannot be simply ignored, such as the reflection characteristics and transmission loss when electromagnetic waves penetrate through medium layers such as walls and windows, as well as the interference problems of various electromagnetic signals existing in space.

[0003] In existing communications, the problem of signal strength deterioration when communication signals penetrate through medium layers such as walls and windows is relatively serious. In order to alleviate the problem of the deterioration of the transmission performance of electromagnetic waves by existing materials. The significant development in the fields of metamaterials and metasurfaces provides a solution for the design of antireflection glass: by attaching metal patterns arranged in a periodic manner to the material, the equivalent permittivity and equivalent permeability of the material can be regulated, which makes it possible to achieve broadband impedance matching between the metamaterial and air under large-angle oblique incidence. However, the existing metasurface structures in the prior art cannot effectively improve the electromagnetic wave transmission performance of the material. Therefore, it is necessary to propose a structure for increasing the electromagnetic wave transmission performance to solve the above problems. Summary of the Utility Model

[0004] In view of the above problems, to overcome the defects of the prior art, the utility model proposes a structure for increasing the electromagnetic wave transmission performance. The purpose of the utility model is to solve the problem that the existing metasurface structure cannot effectively improve the electromagnetic wave transmission performance of the material.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows: The utility model includes:

[0006] A dielectric substrate layer, which includes two basic dielectric layers and an air dielectric layer located between the two basic dielectric layers;

[0007] An electromagnetic wave transmission functional layer, which includes a transparent flexible material layer, a metal pattern layer, and an OCA adhesive layer. The metal pattern layer is printed on one side surface of the transparent flexible material layer, and the transparent flexible material layer is adhered to the outer surface of the dielectric substrate layer through the OCA adhesive layer. The electromagnetic wave transmission functional layer is printed on the side surface of the dielectric substrate layer.

[0008] Preferably, the dielectric substrate layer is a planar or curved electromagnetic wave transmission material.

[0009] Preferably, the transparent flexible material is a PET material.

[0010] Preferably, the metal pattern layer is printed on one side surface of the transparent flexible material layer by the CuMesh process.

[0011] Preferably, for the equally spaced arrangement period T of the metal pattern units of the electromagnetic wave-transparent functional layer, the period T satisfies the formula:

[0012]

[0013]

[0014] In the above formula, c is the speed of light in vacuum, f0 is the center frequency, Er is the dielectric constant of the dielectric substrate material, h is the thickness of the dielectric substrate material, θ is the correction factor, which is adjusted according to actual situations such as different material thicknesses, All parameter units are in mm.

[0015] Preferably, the electromagnetic wave-transparent functional layer is composed of periodically equally spaced metal pattern units, and the metal pattern units are square structures.

[0016] Preferably, in the metal pattern unit, an xy coordinate system is established with two coordinate axes centered on the unit center parallel to the two right-angled sides of the square, and the function is made on the coordinate system:

[0017]

[0018] And the function:

[0019]

[0020] The metal strip in the metal pattern unit coincides with the function f1(x) (where 0 < x ≤ l, l is the maximum value of the metal strip in the x-axis direction, related to the sampling interval and sampling points); the metal branches in the metal pattern unit are line segments perpendicular to the function f2(x) obtained by equally spaced sampling at a series of sampling points on the function; the metal strip and the metal branches are symmetrically rotated at equal intervals of 90° with the unit origin as the axis after widening the width, and the required metal pattern unit can be formed; the line widths of the metal strip and the metal branch lines are equal, and the line width satisfies 0.02T ≤ W ≤ 0.04T.

[0021] Preferably, a series of metal branches are formed by equally spaced sampling, and the sampling interval d satisfies 0.03T ≤ d ≤ 0.07T, and the number of samplings is n (where n takes the maximum value).

[0022] Preferably, the electromagnetic wave-transparent functional layer is composed of several periodically equally spaced metal pattern units, the dielectric substrate layer is composed of several dielectric substrate layer units adapted to the units of the electromagnetic wave-transparent functional layer, the dielectric substrate layer can be a single-layer or multi-layer structure, and the thickness of each layer and the interval between layers are the dimensions of the actual scenario.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The utility model is applied to building structures using dielectric substrates such as building exterior walls, glass windows, plastics, wooden boards, etc. By pasting an electromagnetic wave-transparent functional layer on the surface of the structure, within a specific frequency band and the incoming wave direction of specific electromagnetic waves, the transmission amplitude of electromagnetic waves in the dielectric substrate is greatly increased. This utility model can be used to improve the problem of signal attenuation in buildings using dielectric substrates.

[0025] 2. The electromagnetic wave-transparent functional layer of the utility model can be printed with a flexible material and bonded to the dielectric substrate, which can be used for dielectric substrates of different shapes, greatly facilitating the conformal requirements and having a wider application.

[0026] 3. The utility model has a wide range of applications. For single-layer or multi-layer dielectric substrates in actual scenarios, the utility model flexibly adjusts the size of the electromagnetic wave-transparent functional layer according to the specific size of the dielectric substrate layer to achieve the best performance.

[0027] 4. If the etching process of printed circuit boards is adopted for the utility model, the overall structural strength can be guaranteed; if the conductive glass ITO process is adopted, the high light transmittance of the glass can be guaranteed; if the CuMesh process is adopted to print the electromagnetic wave-transparent functional layer on the transparent flexible material first and then paste it to the dielectric substrate, the high visibility on the surface of the dielectric substrate and the high light transmittance of the transparent material dielectric substrate (such as glass, acrylic material, etc.) can be achieved.

[0028] 5. The installation method of the utility model can be a post-installation process, that is, it can be completed without replacing the original dielectric substrate. The designed electromagnetic wave-transparent functional layer is pasted to the surface of the dielectric substrate through a bonding process. This method greatly improves the application flexibility and makes the wide application and popularization of this structure possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the overall schematic diagram of an embodiment of a structure for increasing the electromagnetic wave transmission performance of the utility model;

[0030] Figure 2 It is the unit schematic diagram of an embodiment of a structure for increasing the electromagnetic wave transmission performance of the utility model;

[0031] Figure 3 It is the plan view of the metal pattern unit of the electromagnetic wave-transparent functional layer in the embodiment of the utility model;

[0032] Figure 4 It is the construction process diagram of the metal pattern unit of the electromagnetic wave-transparent functional layer in the embodiment of the utility model;

[0033] Figure 5 Schematic diagram (top view) of the actual test scenario of the embodiment of the present utility model;

[0034] Figure 6 Electromagnetic wave transmission performance curve of the dielectric substrate before the implementation of the present utility model (comparison of simulation and actual measurement results);

[0035] Figure 7 Electromagnetic wave transmission performance curve of the dielectric substrate after the implementation of the present utility model (comparison of simulation and actual measurement results);

[0036] Figure 8 Electromagnetic wave transmission performance curve on the dielectric substrate after the implementation of the present utility model.

[0037] Reference numerals: 1 - dielectric substrate layer, 2 - basic dielectric layer, 3 - air dielectric layer, 4 - electromagnetic wave transmitting function layer, 5 - OCA adhesive layer, 6 - metal pattern layer, 7 - transparent flexible material layer. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0039] Next, in conjunction with the attached Figure 1-8 A further detailed description will be made of the specific implementation manners of the present utility model.

[0040] The center frequency point required by the design is 4.85 GHz, the design frequency band is 4.8 GHz - 4.9 GHz, and the electromagnetic wave incident angle is 0° - 80°. Please refer to Figure 1-2 , an electromagnetic shielding structure based on a specific function, including:

[0041] The dielectric substrate layer 1, and the dielectric substrate layer 1 includes two basic dielectric layers 2 and an air dielectric layer 3 located between the two basic dielectric layers 2;

[0042] The electromagnetic wave transmitting function layer 4, and the electromagnetic wave transmitting function layer 4 includes a transparent flexible material layer 7, a metal pattern layer 6, and an OCA adhesive layer 5. The metal pattern layer 6 is printed on one side surface of the transparent flexible material layer 7, the transparent flexible material layer 7 is adhered to the outer surface of the dielectric substrate layer 1 through the OCA adhesive layer 5, and the electromagnetic wave transmitting function layer 4 is printed on the side surface of the dielectric substrate layer 1;

[0043] Such as Figure 1 And Figure 2As shown; the electromagnetic wave - transmitting functional layer 4 is arranged on the surface of the dielectric substrate layer 1 through a process. If the dielectric substrate is a PCB substrate, the electromagnetic wave - transmitting functional layer 4 is etched on the surface of the PCB substrate by using the etching process of printed circuit boards. If the dielectric substrate is conductive glass, the ITO process is used to etch the electromagnetic wave - transmitting functional layer 4 on the conductive film. If the dielectric substrate is a conventional material such as tempered glass, acrylic material, plastic, wood, etc.

[0044] In this embodiment, the dielectric substrate layer 1 is made of conventional tempered - glass material, and the thickness of both tempered - glass layers is 10 mm; the thickness of the air - dielectric layer 3 between the two tempered - glass layers is 14 mm.

[0045] In this embodiment, the CuMesh process is adopted. The metal - pattern layer 6 of the electromagnetic wave - transmitting functional layer 4 is first printed on the transparent flexible material layer 7, and then the electromagnetic wave - transmitting functional layer 4 is bonded to the surface of the dielectric substrate layer 1 through the OCA adhesive layer 5 bonding process.

[0046] It should be noted that the metal - pattern circuit layer can be printed on either side of the transparent flexible material layer 7. In this embodiment, the metal - pattern circuit layer is printed on the side of the transparent flexible material layer 7 close to the dielectric substrate layer 1, and the transparent flexible material layer 7 can play a protective role and extend the service life of this structure.

[0047] Among them, the arrangement period of the electromagnetic wave - transmitting functional layer 4 units is T, and it satisfies the formula:

[0048]

[0049] In the above formula, c is the speed of light in vacuum, is the center frequency, Er is the dielectric constant of the dielectric - substrate material, h is the thickness of the dielectric - substrate material, and θ is a correction factor, which is adjusted according to actual situations such as different material thicknesses.

[0050]

[0051] Each of the dielectric substrate layers 1 can be a planar or curved - surface structure, and the dielectric substrate layer 1 can be a single - layer or multi - layer structure. The thickness of each layer, the interval between layers, and other dimensions are the dimensions of the actual scenario, and the unit - structure dimensions of the electromagnetic wave - transmitting functional layer 4 are adjusted according to the specific dimensions of the dielectric substrate layer 11.

[0052] In this embodiment, the construction process of the metal - pattern unit is as Figure 4 shown. As Figure 4 -① shows, an xy - coordinate system is established with the center of the unit as the axis, and two coordinate axes are parallel to the two right - angled sides of the square.

[0053] On the xy - coordinate system, as Figure 4 -①-(a) shows, a specific function is made:

[0054]

[0055] As Figure 4 -①-(b) Generate a specific function:

[0056]

[0057] The metal strip in the metal pattern unit coincides with the function f1(x) (where 0 < x ≤ l, l is the maximum value of the metal strip in the x-axis direction, related to the sampling interval and sampling points); as Figure 4 -②-(a) shows, sample at equal intervals on the function f1(x), as Figure 4 -②-(b) shows, make a series of line segments intersecting the function perpendicular f2(x) from the sampling points as metal branches; the sampling interval is 0.03T ≤ d ≤ 0.07T; as Figure 4 -③ shows, the metal strip and a series of metal branches can form the basis of the metal pattern unit by widening the width; as Figure 4 -④ shows, taking Figure 4 the structure of -③-(a) as the basis, with the unit origin as the axis, rotate symmetrically at equal intervals of 90°, thus forming Figure 3 the complete metal pattern unit shown;

[0058] In this embodiment, since the thicknesses of the two tempered glass layers of the dielectric substrate layer 1 are the same, the sizes of the two electromagnetic wave transmission function layers 4 are the same, and the two metal pattern layers 6( Figure 1 -⑥ and Figure 2 -⑥) are concentric structures;

[0059] In this embodiment, the line width W = 1mm, the sampling interval d = 0.04T, and the number of samplings d = 0.04T;

[0060] In this embodiment, through simulation optimization, the determined functions are respectively:

[0061]

[0062] and

[0063]

[0064] In this embodiment, the electromagnetic wave transmission performance curve of the dielectric substrate before implementation is as Figure 6 shown, and the electromagnetic wave transmission performance curve of the dielectric substrate after implementation is as Figure 7 shown. From Figure 6 and Figure 7 shown, the simulation and measured results are basically the same;

[0065] As Figure 6 shown, the electromagnetic waves in this frequency band are transmitted through the bonded electromagnetic wave transmission function layer 4( Figure 1 -④ andFigure 2 - ④) of the dielectric substrate layer 1( Figure 1 - ① and Figure 2 - ①), the attenuation of the electromagnetic wave signal at different angles is about 6 dB - 9 dB. As Figure 7 shown, after bonding the electromagnetic wave transmitting function layer 4( Figure 1 - ④ and Figure 2 - ④), the dielectric substrate layer 1( Figure 1 - ① and Figure 2 - ①) only attenuates the electromagnetic wave signal by 1.8 dB in this frequency band. Especially at the center frequency point, the electromagnetic wave signal only attenuates by 1.4 dB, indicating that after bonding this electromagnetic wave transmitting function layer 4( Figure 1 - ④ and Figure 2 - ④), there is a good electromagnetic wave transmitting effect.

[0066] In order to intuitively reflect the change in the electromagnetic wave transmission amplitude of the dielectric substrate bonded with this electromagnetic wave transmitting structure compared to the dielectric substrate without bonding this electromagnetic wave transmitting structure, the transmission performance is defined as: Transmission performance (dB) = Electromagnetic wave transmission amplitude (dB) of the dielectric substrate bonded with this electromagnetic wave transmitting structure at a specific incident angle - Electromagnetic wave transmission amplitude (dB) of the dielectric substrate without bonding this electromagnetic wave transmitting structure at a specific incident angle;

[0067] As Figure 8 shown, the curve in the figure is the electromagnetic wave transmission performance before and after processing the dielectric substrate bonded with this electromagnetic wave transmitting structure. In the frequency range of 4.8 GHz - 4.9 GHz and within the electromagnetic wave incident angle range of 0° - 80°, the electromagnetic wave transmission amplitude of the dielectric substrate bonded with this electromagnetic wave transmitting structure increases significantly compared to the dielectric substrate without bonding this electromagnetic wave transmitting structure, and the electromagnetic wave transmission amplitude increases by more than 4.5 dB within the required frequency band range. The dielectric substrate bonded with this electromagnetic wave transmitting structure has a good electromagnetic wave transmitting effect within the designed frequency band.

[0068] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A structure for increasing electromagnetic wave transmission performance, characterized in that: include: A dielectric substrate layer, the dielectric substrate layer comprising two base dielectric layers and an air dielectric layer located between the two base dielectric layers; An electromagnetic wave-transmitting functional layer, wherein the electromagnetic wave-transmitting functional layer comprises a transparent flexible material layer, a metal pattern layer and an OCA adhesive layer, wherein the metal pattern layer is printed on one side surface of the transparent flexible material layer, the transparent flexible material layer is bonded to the outer side surface of the dielectric substrate layer through the OCA adhesive layer, and the electromagnetic wave-transmitting functional layer is printed on the side of the dielectric substrate layer.

2. The structure for increasing electromagnetic wave transmission performance according to claim 1, characterized in that: The dielectric substrate layer is a flat or curved electromagnetic wave transparent material.

3. The structure for increasing electromagnetic wave transmission performance according to claim 1, characterized in that: The transparent flexible material layer is made of PET material.

4. The structure for increasing electromagnetic wave transmission performance according to claim 1, characterized in that: The metal pattern layer is printed on one side surface of the transparent flexible material layer. The metal pattern layer is composed of four metal strips with a unit origin as the axis. Each of the metal strips is fixed with a plurality of irregular metal branches symmetrical about the center line of the metal strip, and the metal branches on each of the metal strips are arranged equidistantly.

5. The structure for increasing electromagnetic wave transmission performance according to claim 1, characterized in that: The electromagnetic wave-transmitting functional layer is composed of metal pattern units that are periodically and evenly arranged, and the metal pattern units are square structures.

6. The structure for increasing electromagnetic wave transmission performance according to claim 1, characterized in that: The electromagnetic wave-transmitting functional layer is composed of a plurality of metal pattern units arranged periodically and at equal intervals, and the dielectric substrate layer is composed of a plurality of dielectric substrate layer units adapted to the electromagnetic wave-transmitting functional layer units. The dielectric substrate layer may be a single-layer or multi-layer structure.

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