Multi-layer composite curtain for preventing electromagnetic information leakage and curtain system

Abstract

The invention discloses a multi-layer composite curtain and a curtain system for preventing electromagnetic information leakage. A curtain body comprises a front surface layer, an electromagnetic shielding layer and a back surface layer which are integrally sewn; the back layer is made of full-shading technical cloth; the electromagnetic shielding layer is a flexible electrode material film prepared from graphene-carbon nanotube composite conductive paste through gradient coating and low-temperature heat treatment, the surface resistance is smaller than or equal to 0.1 ohm / square, and the shielding effectiveness larger than or equal to 70 dB is achieved in the full frequency band of 30 MHz to 18 GHz. The curtain is provided with longitudinal shaping creases along the width, and the lower hem is provided with a counterweight strip. The curtain system comprises the curtain and the track structure, the two ends of the track extend into the wall by at least 15 cm, a side edge sealing structure and a lower hem balancing weight are arranged, and all-directional sealing of the periphery of a window body is achieved. The problems of electromagnetic information leakage and optical vision leakage can be solved on the premise that the building structure is not changed, and the system has the advantages of being low in cost, easy to deploy, high in stability, wide in frequency band and high in attenuation.

Description

Technical Field

[0001] This application relates to the field of electromagnetic information security protection technology, and in particular to a multi-layer composite curtain and curtain system for preventing electromagnetic information leakage. Background Technology

[0002] In high-security environments such as classified offices, financial data centers, and research laboratories, electronic devices (especially monitors, mainframes, and printer controllers) inevitably radiate wide-band (30MHz~18GHz) electromagnetic signals during operation. These signals carry information characteristics of the information processed internally by the device, such as synchronization pulses during CRT / LCD screen refresh, harmonic radiation from the video memory data bus, and transient noise from USB / parallel communication. Attackers can use directional antennas and software-defined radio (SDR) devices to receive these weak radiations from several meters to tens of meters away, and reconstruct the screen display content, keyboard input, and even the original document text using signal processing algorithms (such as TEMPEST technology), posing a serious risk of electromagnetic information leakage (EMI Leakage).

[0003] To address the issue of electromagnetic shielding, existing protective measures mainly include the following aspects:

[0004] I. Building-level shielding methods

[0005] For example, copper mesh walls and shielded equipment rooms are used, but their construction costs are extremely high, retrofitting is difficult, and they are not suitable for existing office environments. For instance, Chinese invention patent CN118890889A discloses a comprehensive electromagnetic shielding protection system for buildings and its shielding effectiveness evaluation method. This protection system includes at least three levels of electromagnetic shielding protection; the first level includes electromagnetic shielding protection for each information device; the second level includes electromagnetic shielding protection for each area in multiple zones; and the third level includes electromagnetic shielding protection for the entire building. This solution constructs a comprehensive protection system at a macro level. However, when retrofitting existing buildings, large-scale shielding construction on walls or windows (such as applying shielding cement or installing shielded windows) is costly and complex to implement.

[0006] II. Equipment-level shielding methods

[0007] For example, equipment shielding covers and filters only cover a single device and cannot solve the problem of combined radiation from multiple devices in one room, and they also affect heat dissipation and operation.

[0008] III. Curtain Shielding Methods

[0009] In building structures, windows, as primary openings, are often critical channels for electromagnetic leakage, becoming weak points in information security protection. Therefore, some curtains with shielding effects exist in existing technologies. Traditional electromagnetic shielding curtains generally use stainless steel / nickel-copper alloy blends, with shielding effectiveness typically below 40dB (above 1GHz). They are also prone to oxidation and significant performance degradation after bending, failing to meet the ≥70dB requirement for sensitive information protection in GB / T18975-2003 "Limits and Measurement Methods for Immunity to Information Technology Equipment". Some curtains use silver fibers, which, while possessing good high-frequency shielding (shielding effectiveness exceeding 40dB in the 1GHz to 18GHz frequency range), have a low-frequency shielding effectiveness of only ≥50dB, still posing a risk of critical fundamental frequency signals being captured by narrowband high-sensitivity receivers. Furthermore, silver ion migration leads to insufficient long-term stability.

[0010] In addition, Chinese invention patent CN117301642A discloses a functional curtain based on reduced graphene oxide and carbon nanotubes and its manufacturing method. The disclosed curtain with electromagnetic shielding effect includes a fabric base layer, an antibacterial layer and an electromagnetic shielding layer disposed between the fabric base layer and the antibacterial layer. The electromagnetic shielding layer is formed by distributing carbon nanotubes between two honeycomb fabric layers.

[0011] Furthermore, Chinese utility model patent CN212666853U discloses a curtain with electromagnetic shielding properties, comprising a fabric base layer, a nanocellulose-based electromagnetic shielding layer, and a microcellulose layer. This curtain uses a nanocellulose mesh structure to support carbon nanotubes, forming a complete electromagnetic shielding layer.

[0012] Although patents CN117301642A and CN212666853U both disclose curtains based on novel shielding materials using carbon nanotubes, which have certain advantages in material selection and curtain structure, they struggle to completely resolve the electromagnetic leakage problem between the curtain system and the building structure while ensuring shielding effectiveness when protecting against windows, the main channel for electromagnetic leakage. Therefore, it is necessary to propose a new technical solution to address the problems existing in the prior art. Summary of the Invention

[0013] This application provides a multi-layer composite curtain and curtain system for preventing electromagnetic information leakage, in order to solve the problem of electromagnetic leakage between existing curtains and building structures.

[0014] To achieve the above objectives, this application provides the following technical solution:

[0015] On the one hand, this application provides a multi-layer composite curtain for preventing electromagnetic information leakage, including a curtain body, the curtain body including a front layer facing the indoor side, a back layer facing the outdoor side, and an electromagnetic shielding layer disposed between the front layer and the back layer. The front layer, the electromagnetic shielding layer and the back layer are sewn together by sewing thread. The back layer is made of blackout technical fabric, and the electromagnetic shielding layer is made of a thin film of highly conductive flexible electrode material.

[0016] The curtain body has multiple parallel longitudinal shaping creases spaced apart along its width direction, and the distance between adjacent longitudinal shaping creases is at least 5cm. The longitudinal shaping creases are used to make the curtain form a continuous wavy pleat shape when it is hanging.

[0017] A counterweight strip is provided at the bottom hem of the curtain body to ensure that the bottom hem of the curtain hangs down and fits against the windowsill or floor when it is suspended.

[0018] Furthermore, in the above technical solution, the top of the curtain body is provided with a plurality of evenly distributed hanging positioning points, and the hanging positioning points are provided with hanging connectors adapted to the curtain installation track.

[0019] Furthermore, the electromagnetic shielding layer includes a conductive network composed of graphene and carbon nanotubes; the electromagnetic shielding layer has a gradient distribution structure along the thickness direction, which is formed by gradient coating and low-temperature heat treatment of graphene-carbon nanotube composite conductive paste.

[0020] Furthermore, the electromagnetic shielding layer is made of a general-purpose electromagnetic shielding cloth prepared using flexible electrode technology based on new energy lithium batteries.

[0021] On the other hand, this application provides a multi-layer composite curtain system for preventing electromagnetic information leakage, including a curtain and a track structure for installing the curtain, wherein the curtain is the aforementioned multi-layer composite curtain for preventing electromagnetic information leakage.

[0022] The track structure includes a horizontal track for suspending the curtains, with both ends of the horizontal track extending at least 15cm into the walls on the left and right sides of the window frame.

[0023] When the curtain is suspended, the wavy pleats facing outwards are flush against the interior wall.

[0024] Furthermore, in the above technical solution, the horizontal track is a Roman rod, a manual sliding track, or an electric track, and the curtain body is detachably connected to the horizontal track via a hanging connector located at its top.

[0025] Furthermore, the horizontal track is provided with multiple suspension points for suspending counterweights, and each suspension point is equipped with a suspension rope. The counterweight is a long strip-shaped block structure, and the counterweight is provided with multiple suspension connection points that correspond one-to-one with the suspension ropes. The counterweight is located in the lower hem area of ​​the curtain body, and the counterweight can rely on its own weight to make the lower hem of the curtain body fit tightly against the building foundation structure.

[0026] Furthermore, it also includes a lifting drive assembly for driving the counterweight to rise and fall, the lifting drive assembly being connected to the counterweight in a transmission manner.

[0027] Furthermore, the track structure also includes a horizontal bar for installing the side sealing structure. The side sealing structure includes a connecting rod parallel to the horizontal track and a left sealing rod and a right sealing rod respectively disposed at both ends of the connecting rod. The left sealing rod and the right sealing rod are perpendicular to the connecting rod. One end of the left sealing rod points to the indoor side and the other end points to the outdoor side. The length direction of the right sealing rod is parallel to the length direction of the left sealing rod. The left sealing rod and the right sealing rod are used to press the curtain body flat and adhere it to the left and right side walls of the window frame.

[0028] The crossbar is parallel to the horizontal track, and the crossbar is provided with multiple mounting points for suspending the connecting rods of the side sealing structure.

[0029] Compared with the prior art, this application has at least the following beneficial effects:

[0030] 1. This application achieves both structural stability and electromagnetic shielding by using a three-layer composite structure—a front layer, an electromagnetic shielding layer, and a back layer—sewn together with stitching thread. The back layer utilizes a fully blackout fabric, ensuring both electromagnetic shielding and excellent optical tightness. Under direct sunlight, there is no specular reflection or light transmission, completely eliminating optical leakage caused by indoor lighting / screens creating shadows or outlines on the curtain surface. Furthermore, the electromagnetic shielding layer employs a highly conductive flexible electrode material film, ensuring effective protection against broadband electromagnetic radiation. The shielding effect is enhanced by the efficient attenuation of electromagnetic signals. Furthermore, by creating multiple parallel longitudinal shaping folds at intervals of at least 5cm along the width of the curtain, the curtain naturally forms continuous wavy folds when suspended. This not only improves the aesthetics of the curtain but also increases the multiple reflection paths of electromagnetic waves on the folded surface, thereby enhancing the shielding effect. Additionally, a counterweight strip is installed at the hem of the curtain body, using its own weight to make the hem hang down and fit against the windowsill or floor. This effectively seals the bottom gap between the curtain and the building structure, preventing electromagnetic signals from leaking from the bottom, thus significantly improving the overall shielding performance.

[0031] 2. By setting multiple evenly distributed hanging positioning points on the top of the curtain body, and installing hanging connectors that are compatible with the curtain installation track at the positioning points, the curtain can be correctly installed on the track, avoiding installation gaps caused by misalignment. At the same time, the evenly distributed hanging positioning points, in conjunction with the shaping creases, ensure that the curtain has a uniform and consistent fold shape after hanging, further ensuring the consistency of the reflection path of electromagnetic waves on the fold surface, thereby maintaining stable shielding performance.

[0032] 3. By setting the electromagnetic shielding layer as a conductive network comprising graphene and carbon nanotubes, and forming a gradient distribution structure along the thickness direction, and using gradient coating and low-temperature heat treatment processes, the shielding layer exhibits gradually varying conductivity and impedance matching characteristics along the thickness direction. This structure can effectively reduce the reflection loss of electromagnetic waves on the surface of the shielding layer, enhance the multiple absorption and attenuation of electromagnetic waves within the layer, thereby achieving efficient shielding of broadband electromagnetic signals and significantly improving the overall electromagnetic protection capability of the curtain.

[0033] 4. By using a general-purpose electromagnetic shielding cloth prepared based on the flexible electrode technology of new energy lithium batteries as the electromagnetic shielding layer, it not only inherits the advantages of high conductivity, good flexibility and stable structure of lithium battery electrode materials, but also realizes low-cost and large-scale preparation of electromagnetic shielding materials through the dimensional reduction preparation process. The shielding cloth has a uniform conductive network and excellent mechanical flexibility, which can maintain stable shielding performance during repeated opening, closing and folding of curtains, thus extending the service life of curtains.

[0034] 5. This application combines the curtain and track structure to form a complete curtain system, and extends both ends of the horizontal track into the wall on the left and right sides of the window frame by at least 15cm, so that the curtain can cover the wall area outside the window frame after being hung, avoiding lateral gaps between the curtain and the edge of the window frame; at the same time, when the curtain body is hung, the wavy pleats facing the outside are in close contact with the interior wall, and the elastic deformation of the pleats fills the tiny gaps between the curtain and the wall, thereby structurally blocking the leakage channel of electromagnetic signals from the window and the building structure, achieving omnidirectional sealing.

[0035] 6. The horizontal track in the curtain system of this application can be any of the existing Roman rods, manual sliding tracks, or electric tracks. The curtain body is detachably connected to the track through the hanging connector at its top. Therefore, users can flexibly choose the track type according to their needs and installation environment. In addition, the use of electric tracks can be linked with other intelligent control systems to realize the automatic opening and closing of the curtains and timed shielding functions, thereby improving the intelligence level of the system and the user experience.

[0036] 7. By setting multiple suspension points on the horizontal track, with suspension ropes at each point, and corresponding suspension connection points on the long strip counterweight block, the long strip counterweight block can be horizontally suspended in the lower area of ​​the curtain hem. The counterweight block uses its own weight to tightly fit the lower hem of the curtain against the building's foundation structure (windowsill or floor), effectively sealing the bottom gaps and preventing electromagnetic signals from leaking from the bottom. The long strip structure design ensures even pressure distribution, avoids localized warping, and ensures the reliability of the bottom seal.

[0037] 8. By setting up a lifting drive component and a counterweight transmission connection, the counterweight has a lifting function, which can raise the counterweight when it is necessary to clean the curtains or adjust the ventilation, thereby releasing the pressure seal of the lower hem; this design not only ensures the electromagnetic shielding effect during daily use, but also takes into account the convenience of curtain maintenance and the flexibility of use.

[0038] 9. By setting up a horizontal bar and a side sealing structure consisting of a connecting rod, a left sealing rod, and a right sealing rod, and by setting the left and right sealing rods perpendicular to the connecting rods respectively, the sealing rods can press the two sides of the curtain body flat and fit against the left and right walls of the window frame. The horizontal bar is set parallel to the horizontal track, and the connecting rod is suspended through the installation point to ensure the stability of the side sealing structure. This design can effectively seal the lateral gaps between the curtain and the wall. Combined with the counterweight seal at the bottom, it forms an all-round electromagnetic seal for the window opening, completely blocking the leakage path of electromagnetic signals from all around the window, and achieving all-round electromagnetic information leakage protection. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application. For example, based on the technical concepts disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, and size ratios of certain units (components).

[0040] Figure 1 This is a schematic diagram of the curtain system in the installation and hanging state in one embodiment;

[0041] Figure 2 This is a schematic diagram showing the state in which the side of the curtain is attached to the wall in one embodiment;

[0042] Figure 3 This is a schematic diagram of a curtain system with counterweights in one embodiment;

[0043] Figure 4 This is a schematic diagram of the planar structure of a curtain system in one embodiment;

[0044] Figure 5 This is a schematic diagram of the cooperation structure between the lower hem counterweight and the curtain in one embodiment;

[0045] Figure 6 This is a schematic diagram of the overall structure of a curtain system in one embodiment.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Curtain body; 11. Vertical shaping creases; 12. Weight strips;

[0048] 2. Track structure; 3. Suspension connector; 4. Wall; 5. Counterweight; 6. Crossbar; 7. Left sealing rod; 8. Connecting rod; 9. Right sealing rod. Detailed Implementation

[0049] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0051] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0052] Example 1

[0053] This embodiment provides a multi-layered composite curtain for preventing electromagnetic information leakage. It primarily utilizes a three-layered composite structure design combining functional zoning, material innovation, and structural synergy to efficiently attenuate and physically block broadband electromagnetic radiation signals generated during the operation of indoor electronic devices. This prevents these signals from leaking out and being illegally received, demodulated, and restored to their original form (such as video images or text content) from a distance. Simultaneously, this curtain also addresses the optical leakage problem caused by indoor lighting or screen illumination, creating shadows or outlines on the curtain surface, thus constructing a dual "electromagnetic + optical" protection system.

[0054] The curtain in this embodiment includes a curtain body 1, which includes a front layer facing the interior, a back layer facing the exterior, and an electromagnetic shielding layer disposed between the front and back layers. The front layer, electromagnetic shielding layer, and back layer are integrally sewn together around the perimeter of the curtain by sewing thread to form a continuous, gapless electromagnetic shielding plane, ensuring that electromagnetic signals cannot leak from the gaps between the layers.

[0055] The electromagnetic shielding layer in this application employs a thin film of a highly conductive flexible electrode material. In a preferred embodiment, the electromagnetic shielding layer comprises a conductive network composed of graphene and carbon nanotubes, prepared by gradient coating and low-temperature heat treatment of a graphene-carbon nanotube composite conductive slurry. This preparation process results in a three-dimensional interpenetrating structure of the conductive network, exhibiting extremely high conductivity uniformity and structural stability.

[0056] In another preferred embodiment, the electromagnetic shielding layer can be a general-purpose electromagnetic shielding cloth fabricated using flexible electrode technology based on new energy lithium batteries. This shielding cloth inherits the advantages of lithium battery electrode materials, such as high conductivity, good flexibility, and structural stability, with a sheet resistance ≤0.1Ω / □. Actual testing (according to GJB2926-1997 "Test Method for Shielding Effectiveness of Electromagnetic Shielding Materials") shows that the electromagnetic shielding layer of this embodiment achieves an electromagnetic shielding effectiveness of ≥80dB in the low-frequency band of 30MHz–1GHz and an electromagnetic shielding effectiveness of ≥70dB in the high-frequency band of 1GHz–18GHz.

[0057] Compared to traditional silver fiber curtains with a shielding effectiveness of only ≥50dB in the 30MHz–1GHz frequency band, this embodiment improves the shielding effectiveness by ≥30dB in the critical low-frequency band. This increases the required signal-to-noise ratio for TEMPEST attacks (i.e., attacks that steal and restore electromagnetic leakage from information devices) by more than a thousand times, upgrading it from "theoretically crackable" to "engineering infeasible." Simultaneously, the inherent strong oxidation resistance and bending fatigue resistance of the flexible electrode material ensure that the shielding effectiveness decreases by <3dB after daily opening and closing (>10,000 times), far superior to silver fiber (attenuation >15dB) and stainless steel fiber (attenuation >25dB), achieving a shielding performance lifespan of >10 years and achieving a maintenance-free effect.

[0058] In this application, the back layer of the curtain body 1 faces the outside and is made of 100% blackout fabric, possessing ultimate optical airtightness. Under direct sunlight, this back layer has no specular reflection or light transmission, completely eliminating optical leakage phenomena such as shadows or outlines on the curtain surface caused by indoor lighting or screen illumination. At the same time, the back layer acts as a physical barrier, blocking external visible light and providing ultraviolet protection and mechanical buffering for the internal electromagnetic shielding layer, extending its service life.

[0059] In this application, the front layer of the curtain body 1 faces the interior side, and different fabric materials and colors can be selected to meet aesthetic requirements. The front layer, electromagnetic shielding layer, and back layer are integrally stitched together to form a complete composite structure, and its hanging state can be seen in [reference needed]. Figure 1 .

[0060] To further enhance electromagnetic shielding effectiveness and ease of installation, the curtain body 1 has multiple parallel longitudinal shaping pleats 11 spaced apart along its width, such as... Figure 1 In a preferred embodiment, the spacing between adjacent longitudinal shaping creases 11 is at least 5 cm (e.g., 10 cm). The longitudinal shaping creases 11 are used to create a continuous wavy pleat shape for the curtain when it is hanging, which not only improves the aesthetics of the curtain, but more importantly, increases the multiple reflection paths of electromagnetic waves on the pleated surface, thereby enhancing the electromagnetic shielding effect.

[0061] In this embodiment, the top of the curtain body 1 is provided with multiple evenly distributed hanging positioning points, and hanging connectors 3 (such as hooks, hanging rings, etc.) adapted to the curtain installation track are provided on the hanging positioning points. The evenly distributed hanging positioning points cooperate with the shaping creases to ensure that the folds of the curtain are uniform and consistent after hanging, further ensuring the consistency of the reflection path of electromagnetic waves on the fold surface, thereby maintaining stable shielding performance.

[0062] To prevent electromagnetic signals from leaking through the gap between the bottom of the curtain and the windowsill or floor, a counterweight strip 12 is installed at the bottom hem of the curtain body 1. The counterweight strip 12 is made of a material with a certain weight (such as a metal strip, rubber strip, or composite material strip) and is used to ensure that the bottom hem of the curtain hangs close to the windowsill or floor when suspended, effectively sealing the bottom gap between the curtain and the building structure using its own weight. As an alternative implementation, the counterweight strip 12 can be sewn inside the bottom hem of the curtain or can be made into a removable structure for easy cleaning and maintenance.

[0063] Example 2

[0064] This embodiment provides a multi-layer composite curtain system for preventing electromagnetic information leakage, including the curtain described in Embodiment 1 and a track structure 2 for installing the curtain. Through the coordinated operation of the track structure 2 and the curtain, the main channel for electromagnetic leakage—the window opening—is completely sealed, effectively blocking the leakage path of electromagnetic signals from all around the window.

[0065] In this application, such as Figure 1 or Figure 3The track structure 2 includes a horizontal track for hanging the curtains. In a preferred embodiment, both ends of the horizontal track extend at least 15cm into the wall 4 on the left and right sides of the window frame. This design allows the curtains to cover the area of ​​the wall 4 outside the window frame after being hung, avoiding lateral gaps between the curtains and the edges of the window frame. Combined with the overlap (≥5cm) formed by the natural draping of the curtains when hung, lateral gaps on the window sides can be effectively eliminated.

[0066] The aforementioned horizontal track can take various forms, such as existing Roman rods, manual sliding tracks, or electric tracks. The curtain body 1 is detachably connected to the horizontal track via a hanging connector 3 located at its top. When using an existing electric track, a drive motor and intelligent control unit can be further configured to achieve automatic opening and closing of the curtains, timed opening and closing, and linkage control with intelligent security systems, thereby improving the system's intelligence level and user experience.

[0067] To further optimize the bottom sealing effect and ensure ease of cleaning and maintenance, this embodiment improves upon Embodiment 1. Specifically, multiple suspension points for suspending the counterweight 5 are provided on the horizontal track, with a suspension rope installed at each point. The counterweight 5 is a long, rectangular block structure, and multiple suspension connection points corresponding to the suspension ropes are provided on the counterweight 5, allowing the counterweight 5 to be horizontally positioned in the lower hem area of ​​the curtain. Figure 5 The counterweight 5 is located in the lower hem area of ​​the curtain body 1, and can rely on its own weight to make the lower hem of the curtain body 1 fit tightly against the building foundation structure (window sill or floor).

[0068] In a preferred embodiment, a lifting drive assembly is further included to drive the counterweight 5 to rise and fall, and the lifting drive assembly is tractively connected to the counterweight 5. The lifting drive assembly can be a manual traction component (such as a pull rope) or a micro motor and a reel. Through the lifting drive assembly, the counterweight 5 has a lifting function: when daily electromagnetic shielding is required, the counterweight 5 descends to the working position, pressing down the hem of the curtain; when it is necessary to clean the curtain or adjust indoor ventilation, the counterweight 5 rises, releasing the pressing seal on the hem. This design ensures both the electromagnetic shielding effect during daily use and the convenience of curtain maintenance and flexibility of use.

[0069] To address the leakage problem caused by gaps between the curtains and the walls on both sides, this embodiment also includes a side sealing structure. Specifically, the track structure 2 further includes a crossbar 6 for mounting the side sealing structure. Figure 6 The side sealing structure includes a connecting rod 8 parallel to the horizontal track and a left sealing rod 7 and a right sealing rod 9 respectively disposed at both ends of the connecting rod 8. The left sealing rod 7 and the right sealing rod 9 are perpendicular to the connecting rod 8 and parallel to each other in their length directions. One end of the left sealing rod 7 points to the indoor side and the other end points to the outdoor side; the right sealing rod 9 is disposed in the same manner as the left sealing rod 7.

[0070] The horizontal bar 6 is set parallel to the horizontal track, and multiple mounting points are provided on the horizontal bar 6 for suspending the connecting rods 8 of the side sealing structure. In actual installation, the left sealing rod 7 and the right sealing rod 9 are located on the left and right sides of the window frame, respectively, which can press the two sides of the curtain body 1 flat and fit against the left and right side walls of the window frame, effectively sealing the lateral gaps between the curtain and the wall.

[0071] As an alternative implementation, the side sealing structure can also take other forms such as magnetic adsorption, Velcro, or elastic strips, as long as it can achieve a tight fit between the side of the curtain and the wall.

[0072] In summary, this application achieves comprehensive electromagnetic sealing of window openings through the coordinated operation of the curtain body, track structure, adjustable counterweight, and side sealing structure: the top is covered by the track, the sides are sealed by the side sealing structure, and the bottom is pressed down by the counterweight. Combined with the high-performance electromagnetic shielding layer of the curtain body itself, this completely blocks the leakage path of electromagnetic signals from all around the window. Simultaneously, the 100% blackout fabric on the back layer solves the problem of optical visual leakage, constructing a dual protection system of "electromagnetic + optical". Furthermore, the curtain system provided by this application requires no civil engineering modifications during installation, does not alter the original building structure or office habits, and only requires the installation of the track and hanging of the curtains to achieve "install-and-use" active defense. It has significant advantages such as low cost, easy deployment, high stability, wide bandwidth, and strong attenuation.

[0073] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0074] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A multi-layered composite curtain for preventing electromagnetic information leakage, characterized in that, The curtain body includes a front layer facing the interior, a back layer facing the exterior, and an electromagnetic shielding layer disposed between the front layer and the back layer. The front layer, the electromagnetic shielding layer, and the back layer are sewn together as a single unit by sewing thread. The back layer is made of blackout fabric, and the electromagnetic shielding layer is made of a thin film of highly conductive flexible electrode material. The curtain body has multiple parallel longitudinal shaping creases spaced apart along its width direction, and the distance between adjacent longitudinal shaping creases is at least 5cm. The longitudinal shaping creases are used to make the curtain form a continuous wavy pleat shape when it is hanging. A counterweight strip is provided at the bottom hem of the curtain body to ensure that the bottom hem of the curtain hangs down and fits against the windowsill or floor when it is suspended.

2. The multi-layer composite curtain for preventing electromagnetic information leakage according to claim 1, characterized in that, The top of the curtain body is provided with multiple evenly distributed hanging positioning points, and the hanging positioning points are provided with hanging connectors that are compatible with the curtain installation track.

3. The multi-layer composite curtain for preventing electromagnetic information leakage according to claim 1, characterized in that, The electromagnetic shielding layer comprises a conductive network composed of graphene and carbon nanotubes; the electromagnetic shielding layer has a gradient distribution structure along the thickness direction, which is formed by gradient coating and low-temperature heat treatment of graphene-carbon nanotube composite conductive paste.

4. The multi-layer composite curtain for preventing electromagnetic information leakage according to claim 1, characterized in that, The electromagnetic shielding layer is a general-purpose electromagnetic shielding cloth prepared using flexible electrode technology based on new energy lithium batteries.

5. A multi-layer composite curtain system for preventing electromagnetic information leakage, characterized in that, Includes a curtain and a track structure for installing the curtain, wherein the curtain is a multi-layer composite curtain for preventing electromagnetic information leakage as described in any one of claims 1 to 4; The track structure includes a horizontal track for suspending the curtains, with both ends of the horizontal track extending at least 15cm into the walls on the left and right sides of the window frame. When the curtain is suspended, the wavy pleats facing outwards are flush against the interior wall.

6. The multi-layer composite curtain system for preventing electromagnetic information leakage according to claim 5, characterized in that, The horizontal track is a Roman rod, a manual sliding track, or an electric track, and the curtain body is detachably connected to the horizontal track via a hanging connector located at its top.

7. The multi-layer composite curtain system for preventing electromagnetic information leakage according to claim 5, characterized in that, The horizontal track is provided with multiple suspension points for suspending counterweights. Each suspension point is equipped with a suspension rope. The counterweight is a long strip-shaped block structure. The counterweight is provided with multiple suspension connection points that correspond one-to-one with the suspension ropes. The counterweight is located in the lower hem area of ​​the curtain body. The counterweight can rely on its own weight to make the lower hem of the curtain body fit tightly against the building foundation structure.

8. The multi-layer composite curtain system for preventing electromagnetic information leakage according to claim 7, characterized in that, It also includes a lifting drive assembly for driving the counterweight to rise and fall, the lifting drive assembly being connected to the counterweight in a transmission manner.

9. The multi-layer composite curtain system for preventing electromagnetic information leakage according to claim 7, characterized in that, The track structure also includes a horizontal bar for installing a side sealing structure. The side sealing structure includes a connecting rod parallel to the horizontal track and a left sealing rod and a right sealing rod respectively disposed at both ends of the connecting rod. The left sealing rod and the right sealing rod are perpendicular to the connecting rod. One end of the left sealing rod points to the indoor side and the other end points to the outdoor side. The length direction of the right sealing rod is parallel to the length direction of the left sealing rod. The left and right sealing rods are used to press the curtain body flat and adhere it to the left and right side walls of the window frame. The crossbar is parallel to the horizontal track, and the crossbar is provided with multiple mounting points for suspending the connecting rods of the side sealing structure.

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