A portable electromagnetic shielding system

Abstract

This utility model discloses a portable electromagnetic shielding system, including a shielding body, a floor assembly, and a shielding curtain, which are detachably connected to form a shielding chamber with a curved inner surface. The shielding body and the shielding curtain are inflatable modules with identical structures. Each inflatable module consists of adjacent composite shielding layers sandwiched by an inflatable interlayer and encased in an inflatable protective sleeve. The floor assembly includes a base plate, a composite shielding layer, and a floor protective sleeve. The composite shielding layers are electrically connected to form at least two closed electromagnetic shielding cages. Adjacent electromagnetic shielding cages are grounded through capacitors. Beneficial effects: This utility model, through the design of the shielding body structure and the conductive splicing with the floor assembly to form at least two closed Faraday cages with an outer layer encasing an inner layer, and with equally spaced insulating interlayers between adjacent Faraday cages, achieves portability, anti-resonance, and enhanced shielding effects through a capacitor connecting the inner Faraday cage to the outer Faraday cage, which is grounded.

Description

Technical Field

[0001] This utility model relates to an electromagnetic shielding system, and more particularly to a portable electromagnetic shielding system, belonging to the field of electromagnetic signal shielding technology. Background Technology

[0002] Electromagnetic shielding technology refers to the technology of confining electromagnetic waves within a specific spatial range or preventing external electromagnetic waves from entering a specific space using conductive or magnetic materials. It includes three basic mechanisms: reflection, absorption, and multiple reflections. Electromagnetic shielding devices are indispensable basic equipment in confidentiality services, routine inspections by national security departments, and counter-eavesdropping and counter-surveillance work.

[0003] Currently, there are two main types of electromagnetic shielding rooms on the market:

[0004] 1. Fixed steel plate assembled shielding room: It is made of 1.5-2mm thick cold-rolled steel plates in modular splicing. The interior can accommodate an entire vehicle and the shielding effectiveness can reach 80-100dB. However, it is expensive, cannot be moved and is complicated to install.

[0005] 2. Small flexible shielding tent: Made of conductive fabric, it can only accommodate people or small equipment. The shielding effectiveness is about 30-60dB. The cost is not high, but the size is too small and the shielding effectiveness is insufficient, which cannot meet the electromagnetic shielding needs of the entire vehicle.

[0006] At the level of shielding structure, cavity resonance is a physical phenomenon that is difficult to avoid in rectangular shielded rooms. When electromagnetic waves reflect back and forth between parallel walls and the dimensions meet the resonance condition, standing waves are formed, causing a sharp drop in shielding effectiveness at specific frequencies. Resonance not only causes shielding failure but also leaks electromagnetic energy outward through gaps, conductors, and other pathways. Therefore, suppressing resonance is crucial for the design of high-efficiency shielded rooms.

[0007] In a design consisting of two layers of electromagnetic shielding fabric with an air layer or a layer of absorbing material sandwiched between them, multiple reflections will still occur even if the distance between the two shielding layers is much smaller than the wavelength. After being reflected by the outer shielding layer, a portion of the electromagnetic wave enters the air gap, is reflected again by the inner shielding layer, and then returns to the outer layer, resulting in phase interference between the reflected wave and the incident wave. When the air layer thickness is an integer multiple of half the wavelength, a resonant cavity will form between the two layers, causing a sharp decrease in shielding effectiveness at that frequency (approximately 20-30 dB). The air layer thickness has a frequency-dependent effect on shielding effectiveness; by controlling the air layer thickness, gain can be obtained in specific frequency bands. However, an inappropriate air layer thickness will also lead to a decrease in shielding effectiveness at high frequencies.

[0008] Chinese patent CN107356821A discloses a vehicle information security detection device and method, including a vehicle detection chamber, scanning equipment, ECU detection tools, wireless transmission detection tools, and an electromagnetic signal detector. The vehicle detection chamber is a sealed space formed by electromagnetic shielding material, and the scanning equipment, ECU detection tools, wireless transmission detection tools, and electromagnetic signal detector are all located inside the vehicle detection chamber. This device places the scanning equipment, ECU detection tools, wireless transmission detection tools, and electromagnetic signal detector within a sealed space that has the function of shielding against external interference. The devices are used to inspect the measurements to be tested within this sealed space. The electromagnetic shielding material is a high conductivity material, such as copper strip, copper wire, silver-locked copper wire, ferrite, steel strip, steel wire, stainless steel wire, etc. The sealed space is constructed using electromagnetic shielding material as the vehicle detection chamber, or electromagnetic shielding material is used as a coating for the sealed space, giving the sealed space electromagnetic shielding functionality. The above technical solution is a fixed shielded chamber, which cannot meet the requirements of mobile detection, rapid deployment, and low cost.

[0009] Chinese patent CN205935907U discloses an inflatable shielding tent, mainly consisting of an air column tent frame, a tent body, and a ground cover. The tent body includes an outer rainproof awning, an outer shielding awning, and an inner shielding awning. The outer rainproof awning is located on the surface of the air column tent frame, and the outer shielding awning, fixedly connected to the air column tent frame, is located on the inner side of the outer rainproof awning. The inner shielding awning is fixedly located at fixed intervals on the inner side of the outer shielding awning. The tent body also has an outer shielding door. This technical solution, using an air column tent frame structure, requires the outer rainproof awning and outer shielding awning to be fixed to the inner and outer surfaces of the air column tent frame separately using buckles or ropes during assembly. The inner shielding awning is fixedly connected to the outer shielding awning using connecting strips. The inner and outer shielding awnings are separate structures and have no conductive connection to the ground cover, resulting in the inability to form a completely closed electromagnetic shielding cage, i.e., a Faraday cage. Furthermore, because the inner and outer shielding awnings are separate structures connected only by connecting strips, the thickness of the air layer between the inner and outer shielding awnings cannot be controlled, thus affecting the shielding effectiveness. Summary of the Invention

[0010] Purpose of the invention: The purpose of this utility model is to address the problems existing in the prior art by providing a driveable portable electromagnetic shielding system for detecting electromagnetic signals in vehicles. Through the design of the shielding main structure and the conductive splicing with the floor component to form at least two closed Faraday cages with an outer layer wrapping an inner layer, an insulating interlayer with equal spacing is provided between adjacent Faraday cages. The inner Faraday cage is electrically connected to the outer Faraday cage through a capacitor, and the outer Faraday cage is grounded, achieving the technical effects of portability, anti-resonance, and enhanced shielding.

[0011] Technical Solution: A portable electromagnetic shielding system includes a shielding body, a floor assembly, and a shielding curtain. The shielding body, floor assembly, and shielding curtain are detachably connected to form a closed shielding chamber. The inner surface of the closed shielding chamber has a curved structure. The shielding body and shielding curtain are inflatable modules with identical structures. Each inflatable module consists of two adjacent composite shielding layers sandwiching an inflatable interlayer and an external inflatable protective sleeve. The floor assembly includes a base plate, a composite shielding layer, and a floor protective sleeve. The base plate is made of an insulating, lightweight, and rigid material. The floor assembly structure consists of two adjacent composite shielding layers sandwiching a base plate. The system consists of an external inflatable protective sleeve; the number of composite shielding layers in the floor assembly is equal to the number of composite shielding layers in the inflatable module, and they have the same structure; the thickness of the substrate is equal to the thickness of the inflatable interlayer after inflation; the shielding body and the corresponding composite shielding layers of the floor assembly are electrically connected end-to-end to form at least two annular composite shielding layers; the shielding body and the corresponding composite shielding layers of the shielding curtain are electrically connected; the shielding curtain and the corresponding composite shielding layers of the floor assembly are electrically connected to form at least two closed electromagnetic shielding cages; adjacent electromagnetic shielding cages are electrically connected by capacitors, and the outermost electromagnetic shielding cage is grounded.

[0012] The operation method of this utility model is to fix the floor assembly at a selected location, and then make the composite shielding layer at the bottom of the floor assembly stably grounded.

[0013] Drive the vehicle directly to the middle of the floor assembly; then connect the side of the uninflated shielding body to one side of the floor assembly, ensuring that the corresponding composite shielding layer is electrically connected; then connect the shielding body across the vehicle to the other side of the floor assembly, ensuring that the corresponding composite shielding layer is electrically connected, forming multiple ring-shaped composite shielding layers connected end to end; then inflate the shielding body into the inflatable interlayer to form an arched cavity.

[0014] Connect the uninflated shielding curtain to the shielding body and floor assembly respectively, ensuring that the corresponding composite shielding layers are electrically connected. Then, inflate the inflatable interlayer to form at least two fully enclosed electromagnetic shielding cages that are nested together.

[0015] The inner side of the enclosed shielding chamber of this invention has a curved structure with no parallel planes, which reduces multiple reflections between parallel walls, improves electromagnetic field uniformity, and suppresses resonance. The identical inflatable modules allow for modular production, resulting in a balanced and stable shielding effect. The method of stacking two adjacent composite shielding layers with an inflatable interlayer sandwiched between them effectively enhances shielding performance, and two or more inflatable interlayers can be stacked as needed. The floor assembly uses a structure of two composite shielding layers with a substrate sandwiched in between, further enhancing shielding performance. The substrate is made of an insulating, lightweight, and rigid material, which improves the load-bearing capacity of the floor assembly. Two or more enclosed electromagnetic shielding cages, separated by insulating inflatable interlayers and insulating substrates, and electrically connected only by capacitors, with the outermost electromagnetic shielding cage grounded, effectively enhance shielding performance.

[0016] In a preferred embodiment, to facilitate installation and suppress resonance, the shielding body and the shielding curtain are connected to the floor assembly by side butt joint, and the inflatable interlayer, after being inflated, has its side tightly attached to the side of the substrate, separating the conductive connection on both sides of the composite shielding layer.

[0017] The connection between the shielding body and the shielding curtain is a side-to-side connection, and the inflated interlayers after inflation are tightly attached to each other on the sides to separate the conductive connection of the two sides of the composite shielding layer.

[0018] The flexible shielding body and shielding curtain are directly connected to the side of the rigid floor assembly, and the shielding space with non-parallel walls is naturally formed by inflation; the composite shielding layer can reliably and stably insulate and separate the conductive connection between the two sides by inflating the air-filled interlayer so that its side is tightly attached to the side of the substrate.

[0019] When connecting a flexible shielding body to a shielding curtain or other flexible template structures with inflatable interlayers, the inflatable interlayers are connected side-by-side, and the sides of the inflated interlayers are tightly pressed together, which can reliably and stably insulate and separate the conductive connections on both sides of the composite shielding layer.

[0020] In a preferred embodiment, to ensure the reliability of the connection between the floor assembly and each flexible module and the continuity of the insulation layer between the composite shielding layers, the composite shielding layer between the floor assembly and the shielding body or shielding curtain is electrically connected via a slot connection assembly. The slot connection assembly includes locking teeth and a slot. The locking teeth are fixedly installed on the side of the composite shielding layer of the shielding body or shielding curtain and do not extend beyond the side of the inflatable interlayer. The slot is fixedly installed on the side of the composite shielding layer of the floor assembly and does not extend beyond the side of the substrate. During connection, the locking teeth are inserted into the slot from one side. When the inflatable interlayer of the flexible module is not inflated, the locking teeth can be completely retracted into the inflatable protective sleeve. When connection is required, open the inflatable protective cover to expose the locking teeth, and at the same time open the floor protective cover to expose the locking slots. Insert the locking teeth into the locking slots from one side, and then inflate the inflatable interlayer. Since neither the locking teeth nor the locking slots extend beyond the side of the corresponding insulating interlayer, the side of the inflatable interlayer is tightly attached to the side of the substrate under the action of air pressure, forming a connection pre-tightening force, thereby achieving the reliability of the connection between the floor assembly and each flexible module, and at the same time achieving the continuity and reliability of the insulation layers between the composite shielding layers.

[0021] In a preferred embodiment, to facilitate the connection between the tooth and the slot and improve operational efficiency, the slot includes a connecting part and a slot part. The connecting part is fixedly connected to the end of the composite shielding layer, and the slot part extends outward from the connecting part. The slot part consists of a pair of slot structures with L-shaped cross-sections and oppositely arranged with a middle break protrusion.

[0022] To facilitate the connection between the teeth and slots, multiple teeth and slots can be arranged in a segmented structure along the side of the composite shielding layer, either continuously or at intervals. To improve the reliability of the connection between the slot and the composite shielding layer, a crimp connection or a through-type connection using connecting bolts can be used. The slot is made of a thin metal sheet, first stamped into a C-shape, and then two opposing L-shaped structures are stamped out in the middle of the outer side. The connecting part is an integral structure, with the slot located outside the connecting part and not penetrating the entire connecting part. Alternatively, multiple slots can be stamped out on one side of the connecting part. The integral structure of the connecting part improves the stability of the slot, thereby improving both the efficiency and reliability of the connection between the teeth and slots.

[0023] In a preferred embodiment, to improve the connection efficiency between flexible modules, the composite shielding layer between the shielding body and the shielding curtain, or between shielding bodies, is electrically connected via a conductive zipper. None of the sides of the conductive zipper extend beyond the side of the inflatable interlayer. The connecting teeth of the conductive zipper are directly positioned on the edge of the composite shielding layer. The zipper structure enables conductive connection between the composite shielding layers. In the uninflated state, the zipper structure is retracted inside the inflatable protective sleeve. During connection, the inflatable protective sleeve is opened, and the connection is made via the zipper structure. After inflation, the sides of the inflatable interlayer are in close contact, ensuring the continuity and reliability of the insulation layer between the composite shielding layers.

[0024] In a preferred embodiment, to improve the shielding effect at the conductive zipper connection, a conductive snap fastener is provided at the conductive zipper connection. The conductive snap fastener is composed of a conductive cloth wrapping a magnetic strip; one end of the conductive cloth is conductively connected to the composite shielding layer, and the other end extends outward to cover the connection of the conductive zipper; during connection, the conductive snap fasteners are staggered and attracted by the magnetic strip, covering the connection of the conductive zipper. The staggered connection of the conductive snap fasteners, thus covering the connection of the conductive zipper, forms a continuous shielding layer, which can prevent the leakage of electromagnetic signals at the zipper connection and improve the overall shielding effect.

[0025] In a preferred embodiment, to effectively avoid resonance, the inflatable interlayer is a non-extended airbag structure; the inflatable interlayer is made of an insulating material; and after inflation, the air layer inside the inflatable interlayer has a uniform thickness, ranging from 5 to 7 mm.

[0026] Air layer thickness has a frequency-dependent effect on shielding effectiveness. By precisely controlling the air layer thickness, gain can be achieved in specific frequency bands. When the air layer thickness is an integer multiple of half the wavelength, a resonant cavity will form between the two layers, causing a sharp drop in shielding effectiveness of approximately 20-30 dB at that frequency. For the highest target frequency band of 11 GHz, the wavelength λ≈27.3 mm, and half the wavelength λ / 2≈13.65 mm. Controlling the thickness to 5-7 mm, less than 13.65 mm, ensures that the shielding is far from the resonant point across the entire frequency band, avoiding resonance dips. Inappropriate air layer thickness will lead to a decrease in shielding effectiveness at high frequencies. Controlling the thickness of the air-filled interlayer of the double-layer shielding to 5-7 mm (within 1 / 4 of the 11 GHz wavelength) actively avoids resonance in the double-layer structure, ensuring stable shielding across the entire frequency band from 30 MHz to 11 GHz.

[0027] A 5-7mm air gap is used to achieve DC insulation between the two composite shielding layers, ensuring the effectiveness of the interlayer multiple reflection mechanism. The two composite shielding layers are not directly electrically connected, nor are they independently grounded. Instead, radio frequency AC coupling is achieved through a parallel high-frequency capacitor.

[0028] Principle Explanation: DC Insulation: Isolates the inner and outer layers in DC and power frequency, avoiding ground loop interference; RF Coupling: Keeps the two layers at the same potential in the 30MHz-11GHz frequency band, ensuring shielding continuity; Multiple Reflections: The air layer allows electromagnetic waves to reflect back and forth between the two layers, enhancing shielding effectiveness.

[0029] In a preferred embodiment, to precisely control the thickness of the air layer within the inflatable interlayer, limiting ropes are evenly distributed along the warp and weft directions inside the inflatable interlayer. These limiting ropes are perpendicular to the upper and lower surfaces of the inflatable interlayer, with both ends fixedly connected to the upper and lower inner walls of the inflatable interlayer. The length of the limiting rope within the air layer inside the inflatable interlayer is 5mm, and the thickness of the air layer between adjacent limiting ropes after inflation does not exceed 7mm. By designing the spacing between the limiting ropes, the thickness of the air layer within the inflatable interlayer can be precisely controlled between 5-7mm.

[0030] In a preferred embodiment, to improve the shielding effect, the composite shielding layer includes an absorption layer and a shielding layer. The shielding layer is disposed near the side of the inflatable interlayer, and the absorption layer is located outside the shielding layer. The absorption layer and the shielding layer are bonded together by conductive adhesive.

[0031] This invention employs the principle of synergistic shielding through absorption, reflection, and reabsorption. Electromagnetic waves are absorbed by the absorption layer, reflected by the shielding layer, and then absorbed again by the absorption layer. The inner absorption layer absorbs electromagnetic waves generated by multiple reflections within the shielding cage, reducing the electromagnetic resonance amplitude within the cage, minimizing interference with the detection equipment, and improving the signal-to-noise ratio. The outer absorption layer absorbs external electromagnetic waves.

[0032] In a preferred embodiment, to ensure the absorption effect of the absorption layer on electromagnetic waves, the absorption layer is a conductive cloth sprayed with a wave-absorbing coating, with a thickness of 0.3 mm and a surface resistance ≤ 1 Ω / sq.

[0033] In a preferred embodiment, to ensure the reflective effect of the shielding layer, the shielding layer is a nickel-copper-nickel three-layer coated carbon fiber fabric with a thickness of 0.2-0.3 mm and a surface resistance ≤0.05 Ω / sq.

[0034] Nickel plating on the surface of carbon fiber fabric enhances the bonding force with the carbon fiber matrix and provides magnetic loss; copper plating in the middle layer forms a highly conductive layer, which serves as the main reflective layer; nickel plating on the surface layer provides oxidation protection and magnetic loss; the combination of the highly conductive layer and the ferromagnetic layer creates both dielectric and magnetic loss effects.

[0035] Preferably, to improve portability and the reliability of connections between the various templates, the inflatable protective sleeve and the floor protective sleeve are made of flame-retardant and waterproof fabric, with the sides closed by zippers to form a sleeve-like structure. During installation, adjacent floor protective sleeves, adjacent inflatable protective sleeves, and floor protective sleeves are connected by zippers. When stored, the floor protective sleeve and the inflatable protective sleeve are each closed by a zipper. The shape of the inflatable protective sleeve can limit the deformation of the inflatable interlayer, the flame-retardant and waterproof material can adapt to various outdoor environments, and it can form a closed unit when stored. The interconnection between the protective sleeves during installation can improve the reliability of the connection, avoid stress at the joint of the composite shielding layer, and improve the reliability of the conductive connection.

[0036] In a preferred embodiment, to improve installation efficiency and grounding reliability, the capacitor is placed inside the substrate, and the two ends of the capacitor are electrically connected to adjacent composite shielding layers, with the bottom composite shielding layer grounded.

[0037] Since the substrate is a rigid structure that can protect the capacitor, directly connecting the capacitor to the adjacent composite shielding layer can avoid connecting the capacitor on-site during installation. Furthermore, connecting multiple capacitors in parallel can improve the reliability of grounding.

[0038] In a preferred embodiment, to ensure that the space of the shielded room meets the actual needs and to improve the stability of the shielded room, an installation frame is provided between the shielding body and the floor assembly. The installation frame is inserted into the floor assembly, and the inner side of the shielding body is connected to the installation frame by cable ties.

[0039] Beneficial effects: This utility model, through the design of the shielding main structure and the conductive splicing with the floor component to form at least two closed Faraday cages with an outer layer wrapping the inner layer, provides an insulating interlayer with equal spacing between adjacent Faraday cages. The inner Faraday cage is electrically connected to the outer Faraday cage through a capacitor, and the outer Faraday cage is grounded, achieving the technical effects of portability, anti-resonance, and enhanced shielding. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of this utility model;

[0042] Figure 2 This is a three-dimensional view of the present invention without the shielding curtain installed;

[0043] Figure 3 This is a view of the entrance direction when the shielding curtain is not installed.

[0044] Figure 4 This is a schematic diagram of the structure of the first embodiment of the shielding body of this utility model;

[0045] Figure 5 This is a schematic diagram of the structure of the floor assembly of this utility model;

[0046] Figure 6 This is a schematic diagram of the structure of the second embodiment of the shielding body of this utility model;

[0047] Figure 7 This is a schematic diagram showing the connection between the shielding body and the floor assembly of this utility model;

[0048] Figure 8 This is a schematic diagram of the conductive connection and installation between the shielding bodies of this utility model;

[0049] Figure 9 This is a schematic diagram of the card slot structure of this utility model;

[0050] Figure 10This is a schematic diagram of the arrangement of the composite shielding layer in the second embodiment of the shielding body of this utility model. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] Example 1

[0055] like Figure 1-5As shown in Figures 7-9, a portable electromagnetic shielding system includes a shielding body 1, a floor assembly 2, and a shielding curtain 3. The shielding body 1, floor assembly 2, and shielding curtain 3 are detachably connected to form a closed shielding chamber. The inner side of the closed shielding chamber has a curved structure. The shielding body 1 and shielding curtain 3 are inflatable modules with identical structures. Each inflatable module consists of two adjacent composite shielding layers 4 sandwiching an inflatable interlayer 5 and an inflatable protective sleeve 6. The floor assembly 2 includes a base plate 21, a composite shielding layer 4, and a floor protective sleeve 22. The base plate 21 is made of an insulating, lightweight, rigid material. The structure of the floor assembly 2 consists of two adjacent composite shielding layers 4 sandwiching an inflatable interlayer 5. The substrate 21 is surrounded by an inflatable protective sleeve 6; the number of composite shielding layers 4 in the floor assembly 2 is equal to the number of composite shielding layers 4 in the inflatable module and the structure is the same; the thickness of the substrate 21 is equal to the thickness of the inflatable interlayer 5 after inflation; the shielding body 1 and the corresponding composite shielding layer 4 of the floor assembly 2 are electrically connected end to end to form two annular composite shielding layers 4; the shielding body 1 and the corresponding composite shielding layer 4 of the shielding curtain 3 are electrically connected; the shielding curtain 3 and the corresponding composite shielding layer 4 of the floor assembly 2 are electrically connected to form two closed electromagnetic shielding cages; adjacent electromagnetic shielding cages are electrically connected through capacitors 23, and the outermost electromagnetic shielding cage is grounded.

[0056] The operation method of this utility model is to fix the floor assembly 2 at a selected location, and then make the composite shielding layer 4 at the bottom of the floor assembly 2 stably grounded.

[0057] Drive the vehicle directly to the middle of the floor assembly 2; then connect the side of the uninflated shielding body 1 to one side of the floor assembly 2, ensuring that the corresponding composite shielding layer 4 is electrically connected; then connect the shielding body 1 across the vehicle to the other side of the floor assembly 2, ensuring that the corresponding composite shielding layer 4 is electrically connected, forming two annular composite shielding layers 4 connected end to end; then inflate the shielding body 1 into the inflatable interlayer 5 to form an arched cavity.

[0058] The uninflated shielding curtain 3 is connected to the shielding body 1 and the floor assembly 2 respectively, ensuring that the corresponding composite shielding layer 4 is electrically connected. Then, air is inflated into the inflatable interlayer 5 to form two completely enclosed electromagnetic shielding cages that are nested together.

[0059] The inner side of the enclosed shielding chamber of this invention has a curved structure with no parallel planes, which reduces multiple reflections between parallel walls, improves electromagnetic field uniformity, and suppresses resonance. The identical inflatable modules can achieve modular production, resulting in a balanced and stable shielding effect. The method of stacking two adjacent composite shielding layers 4 with an inflatable interlayer 5 can effectively enhance the shielding performance. The floor assembly 2 adopts a structure of two composite shielding layers 4 with a substrate 21 sandwiched in the middle, which can further enhance the shielding performance. Furthermore, the substrate 21 is an insulating, lightweight, and rigid material, which can improve the load-bearing capacity of the floor assembly 2. The two enclosed electromagnetic shielding cages are separated from each other by an insulating inflatable interlayer 5 and an insulating substrate 21, and are electrically connected only by a capacitor 23. The grounding of the outermost electromagnetic shielding cage can effectively enhance the shielding performance.

[0060] To facilitate installation and suppress resonance, the shielding body 1 and the shielding curtain 3 are connected to the floor assembly 2 by side-to-side connection. After the air-filled interlayer 5 is inflated, its side is tightly attached to the side of the substrate 21, separating the two sides of the composite shielding layer 4 that is electrically connected.

[0061] The connection between the shielding body 1 and the shielding curtain 3 is a side-to-side connection, and the sides of the inflatable interlayer 5 after inflation are tightly attached to each other to separate the conductive connection of the composite shielding layer 4 on both sides.

[0062] The flexible shielding body 1 and the shielding curtain 3 are directly connected to the side of the rigid floor assembly 2, and the shielding space with non-parallel walls is naturally formed by inflation; the composite shielding layer 4, which is reliably and stably insulatingly separated from the conductive connection on both sides of the substrate 21 after the inflatable interlayer 5 is inflated, is tightly attached to the side of the substrate 21.

[0063] When connecting the flexible shielding body 1 to the shielding curtain 3 or other flexible template structures with inflatable interlayers 5, the inflatable interlayers 5 are connected side by side, and the sides of the inflatable interlayers 5 are tightly attached to each other after inflation, so as to reliably and stably insulate and separate the conductive connection of the composite shielding layer 4 on both sides.

[0064] like Figure 4 , 5 As shown in Figure 7, in order to ensure the reliability of the connection between the floor assembly 2 and each flexible module and the reliability of the continuity of the insulation layer between the composite shielding layer 4, the composite shielding layer 4 between the floor assembly 2 and the shielding body 1 or the shielding curtain 3 is electrically connected through a slot connection assembly 7. The slot connection assembly 7 includes a tooth 71 and a slot 72. The tooth 71 is fixedly installed on the side of the composite shielding layer 4 of the shielding body 1 or the shielding curtain 3 and does not extend beyond the side of the inflatable interlayer 5. The slot 72 is fixedly installed on the side of the composite shielding layer 4 of the floor assembly 2 and does not extend beyond the side of the substrate 21. During connection, the tooth 71 is inserted into the slot 72 from one side.

[0065] When the inflatable interlayer 5 of the flexible module is not inflated, the locking teeth 71 can be completely retracted into the inflatable protective sleeve 6. When connection is required, the inflatable protective sleeve 6 is opened to expose the locking teeth 71, and the floor protective sleeve 22 is opened to expose the locking slots 72. The locking teeth 71 are inserted into the locking slots 72 from one side, and then air is inflated into the inflatable interlayer 5. Since neither the locking teeth 71 nor the locking slots 72 extend beyond the side of the corresponding insulating interlayer, the side of the inflatable interlayer 5 is tightly pressed against the side of the substrate 21 under the action of air pressure, forming a connection pre-tightening force. This ensures the reliability of the connection between the floor assembly 2 and each flexible module, and at the same time, ensures the continuity and reliability of the insulation layers between the composite shielding layers 4.

[0066] like Figure 7 and 9 As shown, in order to facilitate the connection between the tooth 71 and the slot 72 and improve the operating efficiency, the slot 72 includes a connecting part 721 and a slot part 722. The connecting part 721 is fixedly connected to the end of the composite shielding layer 4. The slot part 722 extends outward from the connecting part 721. The slot part 722 consists of a pair of slot structures with L-shaped cross sections and a middle break protrusion.

[0067] To facilitate the connection between the locking teeth 71 and the slots 72, multiple locking teeth 71 and slots 72 can be arranged continuously or at intervals along the side of the composite shielding layer 4 using a segmented structure. To improve the reliability of the connection between the slots 72 and the composite shielding layer 4, a crimp connection or a through-type connection using connecting bolts can be used. The slots 72 are made of thin metal sheet, first stamped into a C-shape, and then two opposing L-shaped structures are stamped out in the middle of the outer side. The connecting part 721 is an integral structure, and the slots 722 are located outside the connecting part 721 and do not penetrate the entire connecting part 721. Alternatively, multiple slots 722 can be stamped out on one side of the connecting part 721. The integral structure of the connecting part 721 can improve the stability of the slots 722, thereby improving the connection efficiency between the locking teeth 71 and the slots 72 while also improving the reliability and stability of the connection.

[0068] like Figure 8 As shown, in order to improve the connection efficiency between flexible modules, the composite shielding layer 4 between the shielding body 1 and the shielding curtain 3 or between the shielding body 1 and the shielding body 1 is electrically connected by a conductive zipper 8, and each side of the conductive zipper 8 does not extend beyond the side of the inflatable interlayer 5.

[0069] The connecting teeth of the conductive zipper 8 are directly set on the edge of the composite shielding layer 4. The conductive connection between the composite shielding layers 4 can be achieved through the zipper structure. When not inflated, the zipper structure is housed inside the inflatable protective sleeve 6. When connecting, the inflatable protective sleeve 6 is opened and the connection is made through the zipper structure. After the inflatable interlayer 5 is inflated, the sides are in close contact, achieving the continuity and reliability of the insulation layer between the composite shielding layers 4.

[0070] To improve the shielding effect at the connection of the conductive zipper 8, a conductive buckle 9 is provided at the connection of the conductive zipper 8. The conductive buckle 9 is composed of a conductive cloth 91 wrapped around a magnetic strip 92. One end of the conductive cloth 91 is conductively connected to the composite shielding layer 4, and the other end extends outward to cover the connection of the conductive zipper 8. When connected, the conductive buckles 9 are staggered and attracted by the magnetic strip 92, covering the connection of the conductive zipper 8.

[0071] By using the staggered connection of conductive snaps 9 to cover the connection of conductive zippers 8, a continuous shielding layer is formed, which can prevent the leakage of electromagnetic signals at the zipper connection and improve the overall shielding effect.

[0072] To effectively avoid resonance, the inflatable interlayer 5 is a non-extended airbag structure; the inflatable interlayer 5 is made of insulating material; after inflation, the air layer in the inflatable interlayer 5 has a uniform thickness, ranging from 5 to 7 mm.

[0073] Air layer thickness has a frequency-dependent effect on shielding effectiveness. By precisely controlling the air layer thickness, gain can be achieved in specific frequency bands. When the air layer thickness is an integer multiple of half the wavelength, a resonant cavity is formed between the two layers, causing a sharp drop in shielding effectiveness of approximately 20-30 dB at that frequency. For the highest target frequency band of 11 GHz, the wavelength λ≈27.3 mm, and half the wavelength λ / 2≈13.65 mm. Controlling the thickness to 5-7 mm, less than 13.65 mm, ensures that the entire frequency band is far from the resonant point, avoiding resonance dips. Inappropriate air layer thickness will lead to a decrease in shielding effectiveness at high frequencies. By controlling the thickness of the air-filled interlayer 5 of the double-layer shielding to 5-7 mm (within 1 / 4 of the 11 GHz wavelength), resonance of the double-layer structure is actively avoided, ensuring that the shielding effectiveness across the entire frequency band from 30 MHz to 11 GHz remains stable above 80 dB. In contrast, existing double-layer shielding technologies often exhibit a 20-30 dB dip at specific frequency points.

[0074] A 5-7mm air gap is used to achieve DC insulation between the two composite shielding layers 4, ensuring the effectiveness of the interlayer multiple reflection mechanism. The two composite shielding layers are not directly electrically connected, nor are they independently grounded. Instead, radio frequency AC coupling is achieved through a parallel high-frequency capacitor.

[0075] Explanation of the principle:

[0076] DC insulation: isolates the inner and outer layers in DC and power frequency frequencies to avoid ground loop interference;

[0077] Radio frequency coupling: ensures that the two layers maintain equipotential in the 30MHz-11GHz frequency band, guaranteeing shielding continuity;

[0078] Multiple reflections: The air layer allows electromagnetic waves to reflect back and forth between the two layers, enhancing the shielding effectiveness.

[0079] Capacitor parameters:

[0080] Capacity: 0.1μF - 1μF.

[0081] Withstand voltage: ≥50V.

[0082] Type: Ceramic capacitor (X7R or NP0).

[0083] Installation location: 21 edges of each outer substrate, for easy inspection and maintenance, such as... Figure 5 As shown.

[0084] Overall grounding strategy:

[0085] Outer shielding layer: connected to the earth at a single point via a grounding stake;

[0086] Inner shielding layer: AC coupled to the outer layer via a high-frequency capacitor;

[0087] Inside the device: Equipotential with the inner shielding layer.

[0088] like Figure 4 As shown, in order to precisely control the thickness of the air layer inside the inflatable interlayer 5, limiting ropes 51 are evenly distributed along the warp and weft directions inside the inflatable interlayer 5. The limiting ropes 51 are set perpendicular to the upper and lower surfaces of the inflatable interlayer 5, and their two ends are fixedly connected to the upper and lower inner walls of the inflatable interlayer 5. The length of the limiting rope 51 within the air layer inside the inflatable interlayer 5 is 5mm, and the thickness of the air layer between adjacent limiting ropes 51 after inflation does not exceed 7mm. By designing the spacing between the limiting ropes 51, the thickness of the air layer inside the inflatable interlayer 5 can be precisely controlled between 5-7mm.

[0089] To improve the shielding effect, the composite shielding layer 4 includes an absorption layer 41 and a shielding layer 42. The shielding layer 42 is disposed near the side of the inflatable interlayer 5, and the absorption layer 41 is located outside the shielding layer 42. The absorption layer 41 and the shielding layer 42 are bonded together by conductive adhesive.

[0090] This invention employs the principle of synergistic shielding through absorption, reflection, and reabsorption. Electromagnetic waves are absorbed by the absorption layer 41, reflected by the shielding layer 42, and then absorbed again by the absorption layer 41. The inner absorption layer 41 absorbs electromagnetic waves generated by multiple reflections within the shielding cage, reducing the electromagnetic resonance amplitude within the cage, minimizing interference with the detection equipment, and improving the signal-to-noise ratio. The outer absorption layer 41 absorbs external electromagnetic waves.

[0091] To ensure the absorption effect of the absorption layer 41 on electromagnetic waves, the absorption layer 41 is a conductive cloth sprayed with a wave-absorbing coating, with a thickness of 0.3 mm and a surface resistance ≤1 Ω / sq.

[0092] Ferrite absorbing coatings can be replaced with carbon-based absorbing materials (graphene, carbon nanotubes), conductive polymers (polyaniline, polypyrrole), magnetic metal powders (carbonyl iron, carbonyl nickel), etc., as long as the surface resistance is ≤1Ω / sq.

[0093] To ensure the reflective effect of the shielding layer, the shielding layer 42 is a nickel-copper-nickel three-layer coated carbon fiber fabric with a thickness of 0.2-0.3mm and a surface resistance ≤0.05Ω / sq.

[0094] Nickel plating on the surface of carbon fiber fabric enhances the bonding force with the carbon fiber matrix and provides magnetic loss; copper plating in the middle layer forms a highly conductive layer, which serves as the main reflective layer; nickel plating on the surface layer provides oxidation protection and magnetic loss; the combination of the highly conductive layer and the ferromagnetic layer creates both dielectric and magnetic loss effects.

[0095] Copper-plated carbon fiber fabric can be replaced with: silver-plated carbon fiber fabric, nickel-plated carbon fiber fabric, stainless steel fiber blended fabric, graphene-coated fabric, etc., as long as the surface resistance is ≤0.05Ω / sq.

[0096] To improve portability and the reliability of connections between the various templates, the inflatable protective sleeve 6 and the floor protective sleeve 22 are made of flame-retardant and waterproof fabric, with zippers closures on the sides to form a sleeve-like structure. During installation, adjacent floor protective sleeves 22, adjacent inflatable protective sleeves 6, and floor protective sleeves 22 and inflatable protective sleeves 6 are connected by zippers. When stored, each floor protective sleeve 22 and inflatable protective sleeve 6 is individually zipped shut. The shape of the inflatable protective sleeve 6 restricts the deformation of the inflatable interlayer 5, the flame-retardant and waterproof material adapts to various outdoor environments, and it forms a closed unit when stored. During installation, the interconnection between the protective sleeves improves connection reliability, avoids stress at the composite shielding layer connection points, and enhances the reliability of the conductive connection.

[0097] The inflatable protective cover 6 and the floor protective cover 22 are made of flame-retardant and waterproof fabric, which can be flame-retardant Oxford cloth, flame-retardant polyester cloth, flame-retardant nylon cloth, aramid cloth, polyimide cloth, etc., as long as the flame retardant rating is V-0.

[0098] like Figure 5 As shown, in order to improve installation efficiency and grounding reliability, the capacitor 23 is pre-placed in the substrate 21, and the two ends of the capacitor 23 are electrically connected to the adjacent composite shielding layer 4, and the bottom composite shielding layer 4 is grounded.

[0099] Since the substrate 21 is a rigid structure that can protect the capacitor, directly connecting the capacitor 23 to the adjacent composite shielding layer 4 can avoid connecting the capacitor 23 on-site during installation. Furthermore, connecting multiple capacitors 23 in parallel can improve the reliability of grounding.

[0100] To ensure that the space of the shielded room meets the actual needs and to improve the stability of the shielded room, an installation frame is provided between the shielding body 1 and the floor assembly 2. The installation frame is inserted into the floor assembly 2, and the inner side of the shielding body 1 is connected to the installation frame by cable ties.

[0101] Example 2

[0102] like Figure 1-3 As shown in Figures 6 and 10, to further improve the shielding effectiveness as needed, the shielding body 1 can adopt a superimposed structure of three or more layers of inflatable interlayer 5.

[0103] A portable electromagnetic shielding system includes a shielding body 1, a floor assembly 2, and a shielding curtain 3. The shielding body 1, floor assembly 2, and shielding curtain 3 are detachably connected to form a closed shielding chamber. The inner side of the closed shielding chamber has a curved structure. The shielding body 1 and shielding curtain 3 are inflatable modules with identical structures. Each inflatable module consists of two adjacent composite shielding layers 4 sandwiching an inflatable interlayer 5 and an inflatable protective sleeve 6. The floor assembly 2 includes a base plate 21, composite shielding layers 4, and a floor protective sleeve 22. The base plate 21 is made of an insulating, lightweight, rigid material. The structure of the floor assembly 2 consists of two adjacent composite shielding layers 4 sandwiching a base plate 21. 1. An external inflatable protective sleeve 6 is formed; the number of composite shielding layers 4 in the floor assembly 2 is equal to the number of composite shielding layers 4 in the inflatable module and the structure is the same; the thickness of the substrate 21 is equal to the thickness of the inflatable interlayer 5 after inflation; the shielding body 1 and the composite shielding layers 4 corresponding to the floor assembly 2 are electrically connected end to end to form three annular composite shielding layers 4; the shielding body 1 and the composite shielding layers 4 corresponding to the shielding curtain 3 are electrically connected; the shielding curtain 3 and the composite shielding layers 4 corresponding to the floor assembly 2 are electrically connected to form three closed electromagnetic shielding cages; adjacent electromagnetic shielding cages are electrically connected through capacitors 23, and the outermost electromagnetic shielding cage is grounded.

[0104] The operation method of this utility model is to fix the floor assembly 2 at a selected location, and then make the composite shielding layer 4 at the bottom of the floor assembly 2 stably grounded.

[0105] Drive the vehicle directly to the middle of the floor assembly 2; then connect the side of the uninflated shielding body 1 to one side of the floor assembly 2, ensuring that the corresponding composite shielding layer 4 is electrically connected; then connect the shielding body 1 across the vehicle to the other side of the floor assembly 2, ensuring that the corresponding composite shielding layer 4 is electrically connected, forming three annular composite shielding layers 4 connected end to end; then inflate the shielding body 1 into the inflatable interlayer 5 to form an arched cavity.

[0106] The uninflated shielding curtain 3 is connected to the shielding body 1 and the floor assembly 2 respectively to ensure that the corresponding composite shielding layer 4 is electrically connected. Then, air is inflated into the inflatable interlayer 5 to form three layered, completely enclosed electromagnetic shielding cages.

[0107] The inner side of the enclosed shielding chamber of this invention has a curved structure with no parallel planes, which reduces multiple reflections between parallel walls, improves electromagnetic field uniformity, and suppresses resonance. The identical inflatable modules can achieve modular production, resulting in a balanced and stable shielding effect. The method of stacking two adjacent composite shielding layers 4 with an inflatable interlayer 5 in between can effectively enhance the shielding performance. The floor assembly 2 adopts a structure of two composite shielding layers 4 with a substrate 21 in between, which can further enhance the shielding performance. The substrate 21 is an insulating, lightweight, and rigid material, which can improve the load-bearing capacity of the floor assembly 2. Three enclosed electromagnetic shielding cages are separated from each other by an insulating inflatable interlayer 5 and an insulating substrate 21, and are electrically connected only by a capacitor 23. The outermost electromagnetic shielding cage is grounded, which can effectively enhance the shielding performance.

[0108] To facilitate installation and suppress resonance, the shielding body 1 and the shielding curtain 3 are connected to the floor assembly 2 by side-to-side connection. After the air-filled interlayer 5 is inflated, its side is tightly attached to the side of the substrate 21, separating the two sides of the composite shielding layer 4 that is electrically connected.

[0109] The connection between the shielding body 1 and the shielding curtain 3 is a side-to-side connection, and the sides of the inflatable interlayer 5 after inflation are tightly attached to each other to separate the conductive connection of the composite shielding layer 4 on both sides.

[0110] The flexible shielding body 1 and the shielding curtain 3 are directly connected to the side of the rigid floor assembly 2, and the shielding space with non-parallel walls is naturally formed by inflation; the composite shielding layer 4, which is reliably and stably insulatingly separated from the conductive connection on both sides of the substrate 21 after the inflatable interlayer 5 is inflated, is tightly attached to the side of the substrate 21.

[0111] When connecting the flexible shielding body 1 to the shielding curtain 3 or other flexible template structures with inflatable interlayers 5, the inflatable interlayers 5 are connected side by side, and the sides of the inflatable interlayers 5 are tightly attached to each other after inflation, so as to reliably and stably insulate and separate the conductive connection of the composite shielding layer 4 on both sides.

[0112] like Figure 6As shown, in order to ensure the reliability of the connection between the floor assembly 2 and each flexible module and the continuity of the insulation layer between the composite shielding layers 4, the composite shielding layers 4 in Embodiment 2 adopt the same connection method as in Embodiment 1. The composite shielding layers 4 between the floor assembly 2 and the shielding body 1 or the shielding curtain 3 are electrically connected through the slot connection assembly 7. The slot connection assembly 7 includes a tooth 71 and a slot 72. The tooth 71 is fixedly installed on the side of the composite shielding layer 4 of the shielding body 1 or the shielding curtain 3 and does not extend beyond the side of the inflatable interlayer 5. The slot 72 is fixedly installed on the side of the composite shielding layer 4 of the floor assembly 2 and does not extend beyond the side of the substrate 21. During connection, the tooth 71 is inserted into the slot 72 from one side.

[0113] When the inflatable interlayer 5 of the flexible module is not inflated, the locking teeth 71 can be completely retracted into the inflatable protective sleeve 6. When connection is required, the inflatable protective sleeve 6 is opened to expose the locking teeth 71, and the floor protective sleeve 22 is opened to expose the locking slots 72. The locking teeth 71 are inserted into the locking slots 72 from one side, and then air is inflated into the inflatable interlayer 5. Since neither the locking teeth 71 nor the locking slots 72 extend beyond the side of the corresponding insulating interlayer, the side of the inflatable interlayer 5 is tightly pressed against the side of the substrate 21 under the action of air pressure, forming a connection pre-tightening force. This ensures the reliability of the connection between the floor assembly 2 and each flexible module, and at the same time, ensures the continuity and reliability of the insulation layers between the composite shielding layers 4.

[0114] like Figure 9 As shown, in order to facilitate the connection between the tooth 71 and the slot 72 and improve the operating efficiency, the slot 72 includes a connecting part 721 and a slot part 722. The connecting part 721 is fixedly connected to the end of the composite shielding layer 4. The slot part 722 extends outward from the connecting part 721. The slot part 722 consists of a pair of slot structures with L-shaped cross sections and a middle break protrusion.

[0115] To facilitate the connection between the locking teeth 71 and the slots 72, multiple locking teeth 71 and slots 72 can be arranged continuously or at intervals along the side of the composite shielding layer 4 using a segmented structure. To improve the reliability of the connection between the slots 72 and the composite shielding layer 4, a crimp connection or a through-type connection using connecting bolts can be used. The slots 72 are made of thin metal sheet, first stamped into a C-shape, and then two opposing L-shaped structures are stamped out in the middle of the outer side. The connecting part 721 is an integral structure, and the slots 722 are located outside the connecting part 721 and do not penetrate the entire connecting part 721. Alternatively, multiple slots 722 can be stamped out on one side of the connecting part 721. The integral structure of the connecting part 721 can improve the stability of the slots 722, thereby improving the connection efficiency between the locking teeth 71 and the slots 72 while also improving the reliability and stability of the connection.

[0116] like Figure 8As shown, in order to improve the connection efficiency between flexible modules, the composite shielding layer 4 between the shielding body 1 and the shielding curtain 3 or between the shielding body 1 and the shielding body 1 is electrically connected by a conductive zipper 8, and each side of the conductive zipper 8 does not extend beyond the side of the inflatable interlayer 5.

[0117] The connecting teeth of the conductive zipper 8 are directly set on the edge of the composite shielding layer 4. The conductive connection between the composite shielding layers 4 can be achieved through the zipper structure. When not inflated, the zipper structure is housed inside the inflatable protective sleeve 6. When connecting, the inflatable protective sleeve 6 is opened and the connection is made through the zipper structure. After the inflatable interlayer 5 is inflated, the sides are in close contact, achieving the continuity and reliability of the insulation layer between the composite shielding layers 4.

[0118] To improve the shielding effect at the connection of the conductive zipper 8, a conductive buckle 9 is provided at the connection of the conductive zipper 8. The conductive buckle 9 is composed of a conductive cloth 91 wrapped around a magnetic strip 92. One end of the conductive cloth 91 is conductively connected to the composite shielding layer 4, and the other end extends outward to cover the connection of the conductive zipper 8. When connected, the conductive buckles 9 are staggered and attracted by the magnetic strip 92, covering the connection of the conductive zipper 8.

[0119] By using the staggered connection of conductive snaps 9 to cover the connection of conductive zippers 8, a continuous shielding layer is formed, which can prevent the leakage of electromagnetic signals at the zipper connection and improve the overall shielding effect.

[0120] like Figure 10 As shown, in order to improve the shielding effect, the composite shielding layer 4 in the middle shares a common absorption layer 41. The composite shielding layer 4 includes an absorption layer 41 and a shielding layer 42. The shielding layer 42 is disposed on the side close to the inflatable interlayer 5, and the absorption layer 41 is located outside the shielding layer 42. The absorption layer 41 and the shielding layer 42 are bonded together by conductive adhesive.

[0121] This invention employs the principle of synergistic shielding through absorption, reflection, and reabsorption. Electromagnetic waves are absorbed by the absorption layer 41, reflected by the shielding layer 42, and then absorbed again by the absorption layer 41. The inner absorption layer 41 absorbs electromagnetic waves generated by multiple reflections within the shielding cage, reducing the electromagnetic resonance amplitude within the cage, minimizing interference with the detection equipment, and improving the signal-to-noise ratio. The outer absorption layer 41 absorbs external electromagnetic waves.

[0122] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0123] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable electromagnetic shielding system comprising a shielding body (1), a floor assembly (2) and a shielding door curtain (3), which are detachably connected to each other to form a closed shielding chamber; characterized in that: The inner side of the enclosed shielded room has a curved structure; The shielding body (1) and the shielding curtain (3) are inflatable modules with the same structure. The inflation module is composed of two adjacent composite shielding layers (4) sandwiching an inflation interlayer (5) and an external inflation protective sleeve (6); The floor assembly (2) includes a substrate (21), a composite shielding layer (4), and a floor protective sleeve (22). The substrate (21) is an insulating, lightweight, rigid material. The floor assembly (2) is composed of two adjacent composite shielding layers (4) sandwiching a substrate (21) in the middle and an inflatable protective sleeve (6) wrapped around the outside; the number of composite shielding layers (4) in the floor assembly (2) is equal to the number of composite shielding layers (4) in the inflatable module and the structure is the same; the thickness of the substrate (21) is equal to the thickness of the inflatable interlayer (5) after inflation. The shielding body (1) and the composite shielding layer (4) corresponding to the floor assembly (2) are electrically connected end to end to form at least two annular composite shielding layers (4). The shielding body (1) and the composite shielding layer (4) corresponding to the shielding curtain (3) are electrically connected; the shielding curtain (3) and the composite shielding layer (4) corresponding to the floor assembly (2) are electrically connected to form at least two closed electromagnetic shielding cages; Adjacent electromagnetic shielding cages are electrically connected by capacitors (23), and the outermost electromagnetic shielding cage is grounded.

2. The portable electromagnetic shielding system of claim 1, wherein: The shielding body (1) and the shielding curtain (3) are connected to the floor assembly (2) by side docking. After the air-filled interlayer (5) is inflated, its side is tightly attached to the substrate (21) and the side is separated by the composite shielding layer (4) that conducts electrical connection on both sides. The connection between the shielding body (1) and the shielding curtain (3) is a side-to-side connection, and the sides of the inflatable interlayer (5) after inflation are tightly attached to each other to separate the conductive connection of the composite shielding layer (4).

3. The portable electromagnetic shielding system of claim 2, wherein: The composite shielding layer (4) between the floor assembly (2) and the shielding body (1) or the shielding curtain (3) is electrically connected by a slot connection assembly (7). The slot connection assembly (7) includes a tooth (71) and a slot (72). The tooth (71) is fixedly installed on the side of the composite shielding layer (4) of the shielding body (1) or the shielding curtain (3) and does not extend beyond the side of the inflatable interlayer (5). The slot (72) is fixedly installed on the side of the composite shielding layer (4) of the floor assembly (2) and does not extend beyond the side of the substrate (21). When connected, the tooth (71) is inserted into the slot (72) from one side.

4. The portable electromagnetic shielding system of claim 3, wherein: The slot (72) includes a connecting part (721) and a slot part (722). The connecting part (721) is fixedly connected to the end of the composite shielding layer (4). The slot part (722) extends outward from the connecting part (721). The slot part (722) consists of a pair of slot structures with L-shaped cross-sections and a middle break protrusion.

5. The portable electromagnetic shielding system of claim 3, wherein: The composite shielding layer (4) between the shielding body (1) and the shielding curtain (3) or between the shielding body (1) and the shielding body (1) is electrically connected by a conductive zipper (8), and each side of the conductive zipper (8) does not extend beyond the side of the inflatable interlayer (5).

6. The portable electromagnetic shielding system of claim 5, wherein: The conductive zipper (8) is provided with a conductive buckle (9) at the connection point. The conductive buckle (9) is composed of a conductive cloth (91) wrapped around a magnetic strip (92). One end of the conductive cloth (91) is conductively connected to the composite shielding layer (4), and the other end extends outward to cover the connection point of the conductive zipper (8). When connected, the conductive buckles (9) are staggered and attracted by the magnetic strip (92) to cover the connection point of the conductive zipper (8).

7. The portable electromagnetic shielding system of claim 1, wherein: The inflatable interlayer (5) is a non-extended airbag structure; the inflatable interlayer (5) is made of insulating material; after inflation, the air layer in the inflatable interlayer (5) has a uniform thickness, and the thickness range of the air layer is 5-7mm.

8. The portable electromagnetic shielding system of claim 7, wherein: The inflatable interlayer (5) is evenly distributed with limiting ropes (51) along the warp and weft directions. The limiting ropes (51) are set perpendicular to the upper and lower surfaces of the inflatable interlayer (5), and their two ends are fixedly connected to the upper and lower inner walls of the inflatable interlayer (5). The length of the limiting rope (51) in the air layer inside the inflatable interlayer (5) is 5mm. After inflation, the thickness of the air layer between adjacent limiting ropes (51) does not exceed 7mm.

9. The portable electromagnetic shielding system of claim 1, wherein: The composite shielding layer (4) includes an absorption layer (41) and a shielding layer (42). The shielding layer (42) is disposed near the side of the inflatable interlayer (5), and the absorption layer (41) is located outside the shielding layer (42). The absorption layer (41) and the shielding layer (42) are bonded together by conductive adhesive.

10. The portable electromagnetic shielding system of claim 9, wherein: The absorption layer (41) is a conductive cloth sprayed with a microwave absorbing coating, with a thickness of 0.3 mm and a surface resistance of ≤1 Ω / sq.

11. The portable electromagnetic shielding system of claim 9, wherein: The shielding layer (42) is a nickel-copper-nickel three-layer coated carbon fiber fabric with a thickness of 0.2-0.3 mm and a surface resistance of ≤0.05Ω / sq.

12. The portable electromagnetic shielding system of claim 1, wherein: The inflatable protective sleeve (6) and the floor protective sleeve (22) are made of flame-retardant and waterproof fabric, and the sides are closed by zippers to form a sleeve-like structure; During installation, adjacent floor protective sleeves (22), adjacent inflatable protective sleeves (6), and floor protective sleeves (22) and inflatable protective sleeves (6) are connected by zippers; during storage, the floor protective sleeves (22) and inflatable protective sleeves (6) are closed and connected by zippers.

13. The portable electromagnetic shielding system of claim 1, wherein: The capacitor (23) is pre-placed in the substrate (21), and the two ends of the capacitor (23) are electrically connected to the adjacent composite shielding layer (4), and the bottom composite shielding layer (4) is grounded.

14. The portable electromagnetic shielding system of claim 1, wherein: An installation frame is provided between the shielding body (1) and the floor assembly (2). The installation frame is inserted into the floor assembly (2), and the inner side of the shielding body (1) is connected to the installation frame by cable ties.

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