Electromagnetic wave shielding composite structure and shielding device thereof

Abstract

The utility model discloses an electromagnetic wave shielding composite structure and a shielding device thereof, the electromagnetic wave shielding composite structure comprises a metal net (4) and Finemet amorphous alloy Fe73.5 Si15.5 B7Cu1Nb3 ribbons (2) arranged on two sides of the metal net (4), the metal net (4) and the Finemet amorphous alloy Fe73.5 Si15.5 B7Cu1Nb3 ribbons (2) arranged on two sides of the metal net (4) are bonded into a whole through self-curing epoxy resin (3), and the metal net (4) and the Finemet amorphous alloy Fe73.5 Si15.5 B7Cu1Nb3 ribbons (2) are bonded into a whole through self-curing epoxy resin (3). And gaps of the metal net (4) are also filled with self-curing epoxy resin (3). The electromagnetic wave shielding composite structure provided by the utility model has the dual characteristics of shielding effectiveness and lightness and thinness, is simple to prepare and low in cost, can have a better electromagnetic shielding effect on electromagnetic waves with various frequencies, has the electromagnetic shielding effectiveness as high as 88-118dB, and has a wide application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of forming and preparing magnetic functional materials and electromagnetic wave shielding materials, and in particular to an electromagnetic wave shielding composite structure and a shielding device thereof. Background Art

[0002] With the development of science and technology and social progress, electromagnetic waves have become an important medium in the information age. While the application of electromagnetic waves in many fields such as radio communications, radar detection, and infrared guidance has brought many conveniences to people's lives, the electromagnetic interference they generate also poses great harm to social production and human health. How to effectively shield electromagnetic waves in specific frequency bands within a certain time and space range and eliminate electromagnetic wave pollution has become a research hotspot in fields such as information technology and biohealth.

[0003] Shielding electromagnetic waves essentially limits their propagation through space, with shielding playing a crucial role. Shielding is typically used to isolate or surround interference sources, reducing radiation damage to sensitive equipment and personnel in the surrounding environment. Another approach is to isolate or surround the equipment being protected with a shield to prevent damage from external electromagnetic interference sources. Electromagnetic shielding can be categorized into electric field shielding, magnetic field shielding, and electromagnetic field shielding.

[0004] There are three types of shielding mechanisms for electromagnetic waves that propagate to the surface of the shield: one is the reflection dissipation on the incident surface; the second is the dissipation of electromagnetic waves that are not reflected and enter the shield and are absorbed by the material; the third is the dissipation of electromagnetic waves that enter the shield and are reflected multiple times by the internal material. The shielding effectiveness of electromagnetic waves can be measured by the effectiveness S of the shield. S refers to the ratio of the power measured at a certain point in space before and after the electromagnetic wave interference source is shielded, that is, the degree to which the radiation energy of the electromagnetic wave interference source is attenuated after being shielded. The formula S = 10lg(P o / P s ) is used to express it. In the formula, P o and P s The two values ​​represent the power measured at a point in space before and after the electromagnetic interference source is shielded. Generally speaking, a shielding effectiveness below 30dB is considered poor; 30-60dB is considered medium, sufficient for general industrial electronic equipment; 60-90dB is considered good, sufficient for military or aerospace equipment; and 90dB or above is considered excellent, sufficient for the shielding of highly sensitive instruments.

[0005] Electromagnetic shielding materials primarily include surface conductive materials, filled composite materials, intrinsically conductive polymers, and conductive fabrics. Based on the composite material type, they can be further categorized into metal-based and carbon-based materials. Commonly used metal-based materials include good conductors such as copper and silver, and ferromagnetic materials with high magnetic permeability such as iron and nickel. However, ferromagnetic shielding materials have the disadvantage of low electrical conductivity, making them unsuitable for shielding high-frequency electromagnetic fields. Furthermore, metal-based materials also present challenges such as poor environmental adaptability, high maintenance costs, and poor durability. Summary of the Invention

[0006] In order to overcome the above-mentioned defects and deficiencies in the prior art, the utility model provides an electromagnetic wave shielding composite structure which is simple to manufacture, low in cost, and can have a good electromagnetic shielding effect on electromagnetic waves of various frequencies.

[0007] Another object of the present invention is to provide an electromagnetic wave shielding device that can effectively shield external electromagnetic interference, ensure the normal operation of the power signal system and ensure the safe use of control equipment.

[0008] The utility model is realized through the following scheme:

[0009] An electromagnetic wave shielding composite structure, comprising a metal mesh and Finemet amorphous alloy Fe disposed on both sides of the metal mesh 73.5 Si 15.5 B7Cu1Nb3 thin ribbon, metal mesh and Finemet amorphous alloy Fe on both sides 73.5 Si 15.5 The B7Cu1Nb3 thin strips are bonded together by self-curing epoxy resin, and the gaps between the metal mesh are also filled with self-curing epoxy resin.

[0010] Preferably, the metal mesh is any one of copper metal mesh, brass metal mesh, tin bronze metal mesh, aluminum bronze metal mesh, beryllium bronze metal mesh, white copper metal mesh, silver metal mesh, gold metal mesh, aluminum metal mesh, titanium metal mesh, stainless steel metal mesh or nickel metal mesh.

[0011] More preferably, the metal mesh is woven from metal wires, a plurality of notches are provided at equal intervals on one side of the metal wires, and the metal wires arranged transversely and the metal wires arranged longitudinally are clamped to each other through the notches.

[0012] Preferably, the diameter of the metal wire is 0.05-0.3 mm, and the spacing between the parallel metal wires is 1-5 mm.

[0013] More preferably, the metal mesh is provided with 3 to 5 layers.

[0014] Preferably, the thickness of a single layer of the metal mesh is 0.05 to 0.3 mm, the thickness of multiple layers of the metal mesh is 0.15 to 1.5 mm, and the mesh holes of the metal mesh are square.

[0015] More preferably, the Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip is 0.02 to 0.03 mm.

[0016] Preferably, the total thickness of the electromagnetic wave shielding composite structure is 0.09 to 0.36 mm when the metal mesh is a single layer, and the total thickness is 0.19 to 1.56 mm when the metal mesh is a multi-layer.

[0017] The electromagnetic wave shielding device of the utility model includes a shielding cabinet made of an electromagnetic wave shielding composite structure, a power signal system is installed in the shielding cabinet, a control device is installed on the outside of the shielding cabinet, and the power signal system installed in the shielding cabinet is electrically connected to the control device on the outside of the shielding cabinet through wired or wireless means.

[0018] As an implementable manner, the power signal system includes a digital pulse circuit, a switching power supply, an AC / DC converter, a DC / DC converter, and a controller which are connected and integrated together.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The utility model discloses an electromagnetic wave shielding composite structure and a shielding device thereof. The electromagnetic wave shielding composite structure comprises a metal mesh and Finemet amorphous alloy Fe arranged on both sides of the metal mesh. 73.5 Si 15.5 B7Cu1Nb3 thin ribbon, metal mesh and Finemet amorphous alloy Fe on both sides 73.5 Si 15.5 The B7Cu1Nb3 thin strips are bonded together by self-curing epoxy resin, and the gaps between the metal mesh are also filled with self-curing epoxy resin.

[0021] Among them, Finemet amorphous alloy Fe 73.5 Si 15.5 B7Cu1Nb3 thin ribbon is a soft magnetic alloy strip with a unique microstructure of long-range disorder and short-range order. It has a very significant scattering effect on the electrons transmitted in it and can effectively attenuate the transmission of electromagnetic waves. In addition, Finemet amorphous alloy Fe 73.5 Si 15.5 Due to the lack of grain boundaries, the B7Cu1Nb3 thin ribbon has more uniform magnetic properties, less resistance to magnetic domain movement, lower magnetic loss, strong electromagnetic wave absorption and reflection, and exhibits excellent electromagnetic wave shielding performance.

[0022] As an excellent insulating material, epoxy resin has a high dielectric constant, a low dielectric loss factor, and a good volume resistivity, which can effectively isolate the electric field and prevent charge leakage. Metal mesh can effectively control the propagation and interference of electromagnetic waves through reflection, absorption, and scattering, shielding electromagnetic waves and reducing the impact of electromagnetic interference on other equipment and systems. 73.5 Si 15.5 The combination of B7Cu1Nb3 thin strips with epoxy resin and metal mesh can fully utilize the dual attenuation mechanism of dielectric loss and magnetic loss, significantly improve the dielectric loss and magnetic loss in the material, and enhance the electromagnetic wave shielding effectiveness.

[0023] Therefore, the electromagnetic wave shielding composite structure of the utility model has both shielding effectiveness and lightness. The electromagnetic wave shielding composite structure can achieve a very efficient electromagnetic shielding effect on electromagnetic waves in the frequency range of 600MHz to 26GHz, and the electromagnetic shielding effectiveness can be as high as 88 to 118dB.

[0024] The electromagnetic wave shielding composite structure of the utility model is simple to manufacture and low in cost, can have a good electromagnetic shielding effect on electromagnetic waves of various frequencies, and has broad application prospects.

[0025] In addition, the electromagnetic wave shielding device of the present invention can effectively shield external electromagnetic interference problems, ensure the normal operation of the power signal system and ensure the safe use of the control equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plan view of the electromagnetic wave shielding composite structure of the present invention.

[0027] Figure 2 yes Figure 1 Enlarged view of point E in the middle.

[0028] Figure 3 yes Figure 1 Cross-sectional view at AA in the middle.

[0029] Figure 4 yes Figure 1 Cross-sectional view at the middle BB.

[0030] Figure 5 yes Figure 2 Cross-sectional view at CC.

[0031] Figure 6 This is a schematic diagram of the shielding principle of the present utility model.

[0032] Figure 7 It is a three-dimensional diagram of the electromagnetic wave shielding device of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described below with reference to specific examples, but the examples do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0034] Unless otherwise specified, the reagents and materials used in the following examples were commercially available.

[0035] Example 1 An electromagnetic wave shielding composite structure

[0036] An electromagnetic wave shielding composite structure 1, such as Figure 1 As shown, it includes a metal mesh 4 and Finemet amorphous alloy Fe disposed on both sides of the metal mesh 4. 73.5 Si 15.5 B7Cu1Nb3 thin strip 2, metal mesh 4 and Finemet amorphous alloy Fe on both sides 73.5 Si 15.5 The B7Cu1Nb3 thin strips 2 are bonded together by a self-curing epoxy resin 3 , and the gaps in the metal mesh 4 are also filled with the self-curing epoxy resin 3 .

[0037] Among them, Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip 2 is about 0.03 mm, and the size is 10 cm×10 cm.

[0038] The metal mesh 4 is any one of copper metal mesh, brass metal mesh, tin bronze metal mesh, aluminum bronze metal mesh, beryllium bronze metal mesh, white copper metal mesh, silver metal mesh, gold metal mesh, aluminum metal mesh, titanium metal mesh, stainless steel metal mesh or nickel metal mesh.

[0039] In this embodiment, the metal mesh 4 is woven from copper wires, with notches 5 spaced 5 mm apart. The notches 5 are 0.2 mm wide and 0.1 mm deep. The wires are arranged in two layers, one above the other, with the notches 5 facing each other and locked in place. The copper wires have a diameter of 0.2 mm, and the mesh openings are square, with 5 mm spacing between adjacent wires both longitudinally and transversely. The mesh measures 10 cm x 10 cm and has a thickness of 0.2 mm. The thickness of the self-curing epoxy resin 3 is determined based on the actual bonding requirements, resulting in a total thickness of the electromagnetic wave shielding composite structure of 0.26 mm.

[0040] The shielding mechanism of the electromagnetic wave shielding composite structure is as follows: Figure 6 shown.

[0041] The electromagnetic wave shielding composite structure can be prepared by the following method:

[0042] (1) Select Finemet amorphous alloy Fe with excellent soft magnetic properties 73.5 Si 15.5 B7Cu1Nb3 composition, using FeB alloy, Fe, Si, Cu and Nb and other industrial raw materials, 10 grams of raw materials are prepared according to atomic percentage, and smelted multiple times in a vacuum arc melting furnace under inert gas protection to obtain a master alloy ingot;

[0043] (2) The obtained master alloy ingot was crushed, and 2 g of alloy fragments were weighed and placed in a quartz tube. The alloy fragments were melted into molten alloy by medium frequency induction melting under inert gas protection in a vacuum arc melting strip furnace. The molten alloy flowed out through the opening at the bottom of the quartz tube and was spun into an alloy strip with a thickness of about 0.03 mm and a width of 10 cm by means of a high-speed rotating copper roller;

[0044] (3) Characterization of the prepared Finemet amorphous alloy Fe using an X-ray diffractometer 73.5 Si 15.5 The B7Cu1Nb3 ribbon has an amorphous structure;

[0045] (4) The obtained Finemet amorphous alloy Fe 73.5 Si 15.5 Cut the B7Cu1Nb3 ribbon into two pieces with the size of 10cm×10cm;

[0046] (5) 42 copper wires with a length of 100 mm and a diameter of 0.2 mm were cut with a notch of 0.2 mm in width and 0.1 mm in depth every 5 mm in the longitudinal direction;

[0047] (6) Arrange the copper wires with the notches and weave them into a copper metal mesh, ensuring that the notches of the upper and lower layers of copper wire are aligned and locked face to face, forming a copper metal mesh with a size of 10 cm × 10 cm;

[0048] (7) The self-curing epoxy resin is evenly coated on two pieces of Finemet amorphous alloy Fe 73.5 Si 15.5 The inner surface of the B7Cu1Nb3 ribbon;

[0049] (8) Place the copper metal mesh on a piece of Finemet amorphous alloy Fe coated with self-curing epoxy resin. 73.5 Si 15.5 On the inner surface of the B7Cu1Nb3 ribbon, ensure that the copper metal mesh is connected with the Finemet amorphous alloy Fe 73.5 Si 15.5 The B7Cu1Nb3 ribbon is aligned on all sides;

[0050] (9) coating the copper metal mesh with a self-curing epoxy resin, ensuring that the self-curing epoxy resin permeates all the copper wires and completely covers the copper wires;

[0051] (10) Another piece of Finemet amorphous alloy Fe coated with self-curing epoxy resin 73.5 Si 15.5 The inner surface of the B7Cu1Nb3 thin strip is covered on the copper metal mesh coated with the self-curing epoxy resin, and is aligned with the copper metal mesh to form the Finemet amorphous alloy Fe 73.5 Si 15.5 B7Cu1Nb3 thin ribbon-copper metal mesh-Finemet amorphous alloy Fe 73.5 Si 15.5 Sandwich complex of B7Cu1Nb3 thin ribbons;

[0052] (11) The above-mentioned Finemet amorphous alloy Fe 73.5 Si 15.5 B7Cu1Nb3 thin ribbon-copper metal mesh-Finemet amorphous alloy Fe 73.5 Si 15.5 The sandwich composite of B7Cu1Nb3 thin ribbons was placed between two pressing plates with a pressing surface size of 10 cm × 10 cm, ensuring that the four sides of the pressing plates were aligned. The pressing plates were pressed tightly, and the self-curing epoxy resin squeezed out of the sandwich composite was wiped clean.

[0053] (12) After the self-curing epoxy resin is cured, the pressing plate is released to obtain a sandwich-structured electromagnetic wave shielding composite structure.

[0054] Example 2 An electromagnetic wave shielding composite structure

[0055] The difference between this embodiment and embodiment 1 is that the metal mesh 4 adopts a three-layer structure, the diameter of the copper wire is 0.05 mm, the vertical and horizontal distances between adjacent copper wires in the mesh are both 1 mm, and the Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip 2 is about 0.02 mm, the thickness of the self-curing epoxy resin 3 is determined according to the actual pasting requirements, and the total thickness of the electromagnetic wave shielding composite structure 1 is controlled at 0.21 mm.

[0056] Example 3: An electromagnetic wave shielding composite structure

[0057] The difference between this embodiment and embodiment 1 is that the metal mesh 4 adopts a 5-layer structure, the diameter of the copper wire is 0.15 mm, the vertical and horizontal distances between adjacent copper wires in the mesh are both 3 mm, and the Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip 2 is about 0.025 mm, the thickness of the self-curing epoxy resin 3 is determined according to actual pasting requirements, and the total thickness of the electromagnetic wave shielding composite structure 1 is controlled at 0.95 mm.

[0058] Example 4: An electromagnetic wave shielding composite structure

[0059] The difference between this embodiment and embodiment 1 is that the metal mesh 4 adopts a 5-layer structure, the diameter of the copper wire is 0.3 mm, the vertical and horizontal distances between adjacent copper wires in the mesh are both 4 mm, and the Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip 2 is about 0.028 mm, and the thickness of the electromagnetic wave shielding composite structure 1 is controlled at 1.56 mm.

[0060] Example 5: An electromagnetic wave shielding composite structure

[0061] The difference between this embodiment and embodiment 1 is that the metal mesh 4 adopts a single-layer structure, the diameter of the copper wire is 0.28 mm, the vertical and horizontal distances between adjacent copper wires in the mesh are both 4 mm, and the Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip 2 is about 0.023 mm, the thickness of the self-curing epoxy resin 3 is determined according to the actual pasting requirements, and the total thickness of the electromagnetic wave shielding composite structure 1 is controlled at 0.36 mm.

[0062] Or the metal mesh 4 adopts a 1-layer structure, the diameter of the copper wire is 0.05mm, the vertical and horizontal distances between adjacent copper wires in the mesh are 4mm, Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of B7Cu1Nb3 ribbon 2 is about 0.02 mm, and Finemet amorphous alloy Fe 73.5 Si 15.5 The B7Cu1Nb3 thin strips 2 are directly bonded by the self-curing epoxy resin 3 filling the gaps in the metal mesh 4, and the total thickness of the electromagnetic wave shielding composite structure 1 is controlled at 0.09 mm.

[0063] Example 6: An electromagnetic shielding device

[0064] An electromagnetic wave shielding device ( Figure 7 ), including a shielding cabinet 6 made of an electromagnetic wave shielding composite structure 1, a power signal system 7 is installed in the shielding cabinet 6, a control device 8 is installed outside the shielding cabinet 6, and the power signal system 7 installed in the shielding cabinet 6 is electrically connected to the control device 8 outside the shielding cabinet 6 via a wired or wireless connection. In this embodiment, the power signal system 7 installed in the shielding cabinet 6 is electrically connected to the control device 8 outside the shielding cabinet 6 via a wired connection.

[0065] As an implementable manner, the power signal system 7 includes a digital pulse circuit, a switching power supply, an AC / DC converter, a DC / DC converter, and a controller connected and integrated together. In this embodiment, the control device 8 is an electrical device.

[0066] The power signal system is a key system for ensuring the safety of electrical equipment. If the distance between the electrical equipment and the power signal system is too close, the mutual coupling of the electromagnetic fields will affect the safe and stable operation of the power signal system. In the fields of information communication and automatic control, the power signal system and electrical equipment are constantly developing towards miniaturization and integration. One of the main reasons for the increasingly prominent electromagnetic interference problem in the power signal system is the large-scale application of pulse circuits. In order to ensure the normal operation of the power signal system and the safety of electrical equipment, the problem of electromagnetic wave interference cannot be ignored. In order to resist external electromagnetic wave interference, the power signal system components such as digital pulse circuits, switching power supplies, AC / DC converters, DC / DC converters, etc. are integrated and arranged in a shielding cabinet 6 made of the electromagnetic wave shielding composite structure (1) of the utility model to form an electromagnetic shielding device, which can effectively shield the external electromagnetic interference problem and ensure the normal operation of the power signal system and the safety of electrical equipment.

[0067] The shielding cabinet 6 of the present invention is composed of a peripheral wall, a top plate and a bottom plate, wherein the peripheral wall, the top plate and the bottom plate are respectively formed by splicing one or more electromagnetic wave shielding composite structures, and the two adjacent electromagnetic wave shielding composite structures are riveted with conductive structural glue.

[0068] Example 7: An electromagnetic shielding device

[0069] The difference between this embodiment and embodiment 6 is that the power signal system 7 installed in the shielding cabinet 6 is electrically connected to the control device 8 outside the shielding cabinet 6 via wireless.

[0070] Application Example 1

[0071] 1. Use an electromagnetic wave generator to emit 900MHz electromagnetic waves for mobile phone 2G communication;

[0072] 2. Use a spectrum analyzer to detect the frequency of the electromagnetic wave emitted by the above electromagnetic wave generator within 1 to 2 meters, which is 900MHz;

[0073] 3. Using an electromagnetic wave generator to emit electromagnetic waves with a frequency of 900 MHz for mobile phone 2G communication toward the electromagnetic wave shielding composite structure of Example 1;

[0074] 4. Using a vector network analyzer and the flange coaxial device method (GB / T 30142-2013), the shielding effectiveness of the electromagnetic wave shielding composite structure of Example 1 against the electromagnetic wave with a frequency of 900 MHz used for the above-mentioned mobile phone 2G communication was measured to be 116 dB.

[0075] Application Example 2

[0076] 1. Use electromagnetic wave generator to emit 2.1GHz electromagnetic waves for mobile phone 3G communication;

[0077] 2. Using a spectrum analyzer to detect the electromagnetic wave frequency emitted by the electromagnetic wave generator within 1 to 2 meters, it is 2.1 GHz;

[0078] 3. An electromagnetic wave generator is used to emit electromagnetic waves with a frequency of 2.1 GHz for mobile phone 3G communication, directed toward the electromagnetic wave shielding composite structure of Example 2;

[0079] 4. The shielding effectiveness of the electromagnetic wave shielding composite structure of Example 1 against the 2.1 GHz electromagnetic wave used for 3G communication of the mobile phone was measured by a vector network analyzer using the flange coaxial device method (GB / T 30142-2013) and was 107 dB.

[0080] Application Example 3

[0081] 1. Use an electromagnetic wave generator to emit 2.6GHz electromagnetic waves for mobile phone 4G communication;

[0082] 2. Using a spectrum analyzer to detect the electromagnetic wave frequency emitted by the electromagnetic wave generator within 1 to 2 meters, it is 2.6 GHz;

[0083] 3. An electromagnetic wave generator is used to emit electromagnetic waves with a frequency of 2.6 GHz for mobile phone 4G communication, directed toward the electromagnetic wave shielding composite structure of Example 3;

[0084] 4. Using a vector network analyzer and the flange coaxial device method (GB / T 30142-2013), the shielding effectiveness of the electromagnetic wave shielding composite structure of Example 1 against the 2.6 GHz electromagnetic wave used for 4G communication of the above-mentioned mobile phone was measured to be 102 dB.

[0085] Application Example 4

[0086] 1. Use an electromagnetic wave generator to emit 5.6GHz electromagnetic waves for mobile phone 5G communication;

[0087] 2. Using a spectrum analyzer to detect the electromagnetic wave frequency emitted by the electromagnetic wave generator within 1 to 2 meters, it is 5.6 GHz;

[0088] 3. An electromagnetic wave generator is used to emit electromagnetic waves with a frequency of 5.6 GHz for 5G communication of mobile phones toward the electromagnetic wave shielding composite structure of Example 4;

[0089] 4. Using a vector network analyzer and the flange coaxial device method (GB / T 30142-2013), the shielding effectiveness of the electromagnetic wave shielding composite structure of Example 1 against the 5.6 GHz electromagnetic wave used for 5G communication of the above-mentioned mobile phone was measured to be 98 dB.

[0090] Application Example 5

[0091] 1. Use an electromagnetic wave generator to transmit 26GHz electromagnetic waves for wireless communication;

[0092] 2. Using a spectrum analyzer to detect the electromagnetic wave emitted by the electromagnetic wave generator within 1 to 2 meters, the frequency is 26 GHz;

[0093] 3. Using an electromagnetic wave generator to transmit 26 GHz electromagnetic waves for wireless communication toward the electromagnetic wave shielding composite structure of Example 5;

[0094] 4. The shielding effectiveness of the electromagnetic wave shielding composite structure of Example 1 against the above-mentioned 26 GHz electromagnetic wave for wireless communication was measured by a vector network analyzer using the flange coaxial device method (GB / T 30142-2013), and was 88 dB.

[0095] The above embodiments are preferred implementation methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. An electromagnetic wave shielding composite structure, characterized in that: The invention comprises a metal mesh (4) and Finemet amorphous alloy Fe disposed on both sides of the metal mesh (4). 73.5 Si 15.5 B7Cu1Nb3 thin strip (2), metal mesh (4) and Finemet amorphous alloy Fe on both sides thereof 73.5 Si 15.5 The B7Cu1Nb3 thin strips (2) are bonded together by a self-curing epoxy resin (3), and the gaps in the metal mesh (4) are also filled with the self-curing epoxy resin (3).

2. The electromagnetic wave shielding composite structure according to claim 1, characterized in that: The metal mesh (4) is any one of copper metal mesh, brass metal mesh, tin bronze metal mesh, aluminum bronze metal mesh, beryllium bronze metal mesh, white copper metal mesh, silver metal mesh, gold metal mesh, aluminum metal mesh, titanium metal mesh, stainless steel metal mesh or nickel metal mesh.

3. The electromagnetic wave shielding composite structure according to claim 2, characterized in that: The metal mesh (4) is woven from metal wires, and a plurality of notches (5) are provided at equal intervals on one side of the metal wires. The metal wires arranged transversely and the metal wires arranged longitudinally are connected to each other through the notches.

4. The electromagnetic wave shielding composite structure according to claim 3, characterized in that: The diameter of the metal wire is 0.05-0.3 mm, and the spacing between the parallel metal wires is 1-5 mm.

5. The electromagnetic wave shielding composite structure according to claim 2, characterized in that: The metal mesh (4) is provided with 3 to 5 layers.

6. The electromagnetic wave shielding composite structure according to claim 5, characterized in that: The thickness of a single layer of the metal mesh (4) is 0.05 to 0.3 mm, the thickness of multiple layers of the metal mesh (4) is 0.15 to 1.5 mm, and the mesh holes of the metal mesh (4) are square.

7. The electromagnetic wave shielding composite structure according to claim 1, characterized in that: The Finemet amorphous alloy Fe 73.5 Si 15.5 The thickness of the B7Cu1Nb3 thin strip (2) is 0.02 to 0.03 mm.

8. The electromagnetic wave shielding composite structure according to claim 1, characterized in that: The total thickness of the electromagnetic wave shielding composite structure is 0.09 to 0.36 mm when the metal mesh (4) is a single layer, and is 0.19 to 1.56 mm when the metal mesh (4) is a multi-layer structure.

9. An electromagnetic wave shielding device, characterized in that: It comprises a shielding cabinet (6) made of the electromagnetic wave shielding composite structure described in any one of claims 1 to 8, a power signal system (7) is installed in the shielding cabinet (6), a control device (8) is installed on the outside of the shielding cabinet (6), and the power signal system (7) installed in the shielding cabinet (6) is electrically connected to the control device (8) on the outside of the shielding cabinet (6) via wired or wireless communication.

10. The electromagnetic wave shielding device according to claim 9, wherein The power signal system (7) includes a digital pulse circuit, a switching power supply, an AC / DC converter, a DC / DC converter, and a controller which are connected and integrated together.

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