Microwave camera obscura and wireless performance test equipment

Abstract

The invention discloses a microwave camera obscura and wireless performance test equipment. The microwave camera obscura comprises a main frame layer, a metal shielding layer and a wave absorbing layer, the main frame layer comprises a plurality of rod pieces which are assembled in a lap joint mode, and the main frame layer is cubic; the metal shielding layer sleeves the inner side of the main frame layer, the metal shielding layer comprises a plurality of conductive metal plates and a plurality of metal shielding strips, and the conductive metal plates are laid on six surfaces of the main frame layer; the metal shielding strips abut against the adjacent conductive metal plates in a sealed mode. The wave absorbing layer sleeves the inner side of the metal shielding layer and is connected to the conductive metal plate, and a shielding space is defined by the wave absorbing layer; through the lap joint of the main body frame layer and the design of the split type metal shielding layer, the traditional integrated welding of the microwave camera obscura is converted into an assembly mode capable of being quickly assembled on site, so that the construction period is greatly shortened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of wireless performance testing equipment technology, and in particular to a microwave anechoic chamber and wireless performance testing equipment. Background Technology

[0002] A microwave anechoic chamber is a critical facility used for antenna measurement, electromagnetic compatibility (EMC) testing, and radar cross section (RCS) measurement. It is constructed by lining the interior with absorbing materials to simulate the electromagnetic environment of free space. Its core function requires high electromagnetic shielding performance to isolate external electromagnetic interference and suppress internal reflections.

[0003] Microwave anechoic chambers in related technologies typically employ an integrated welded metal plate structure (such as steel or copper plates spliced ​​and welded together). The advantage of this structure is its continuous and intact shielding, with permanent electrical connections achieved through welding at the joints, ensuring extremely high shielding effectiveness (typically >80dB) across a wide frequency range (especially low frequencies), meeting stringent testing standards. However, this fixed structure has the following drawbacks: long construction period, high cost, immobility, and difficulty in modification. Especially for medium to large-sized microwave anechoic chambers, traditional welded designs are prone to leaks, resulting in poor sealing and shielding performance, failing to meet high-precision testing requirements, and making it difficult to locate leaks. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a microwave anechoic chamber and wireless performance testing equipment, which can expand the size of the microwave anechoic chamber by splicing rods, and form a dense metal shielding layer by combining the laid conductive metal layer and metal shielding strips, and form a shielding space by incorporating a built-in wave-absorbing layer. The entire microwave anechoic chamber has a short construction cycle, is disassembled and reusable, and its volume can be expanded according to the actual required shielding space.

[0005] On one hand, embodiments of the present invention provide a microwave anechoic chamber, comprising: The main frame layer comprises multiple overlapping and assembled rods, and the main frame layer is cubic in shape. A metal shielding layer is sleeved on the inner side of the main frame layer. The metal shielding layer includes multiple conductive metal plates and multiple metal shielding strips. The conductive metal plates are laid on the six sides of the main frame layer. The metal shielding strips are sealed and abut against the adjacent conductive metal plates. An absorbing layer is fitted inside the metal shielding layer and connected to the conductive metal plate, forming a shielding space.

[0006] According to some embodiments of the present invention, the metal shielding layer further includes a dustproof strip, which is sealed against the adjacent conductive metal plates and located on the side of the metal shielding strip away from the shielding space.

[0007] According to some embodiments of the present invention, the conductive metal plate includes a main plate portion and an abutment plate portion, the abutment plate portion being connected to the edge of the main plate portion and being arranged at a right angle to the main plate portion, and the metal shielding strip being provided between the abutment plate portions of adjacent conductive metal plates.

[0008] According to some embodiments of the present invention, the metal shielding strip includes an abutting portion and a compression portion, the abutting portion being plate-shaped and adapted to adhere to the abutting plate portion of one of two adjacent conductive metal plates; The compression part is connected to the abutment part. The width of the cross-section of the compression part is smaller than the width of the cross-section of the abutment part, so as to reserve deformation space on both sides of the compression part. The compression part is adapted to abut against the abutment plate part of the other of the two adjacent conductive metal plates.

[0009] According to some embodiments of the present invention, the conductive metal plate further includes a limiting plate portion, the limiting plate portion being parallel to the main body plate portion, the main body plate portion being connected to a first end of the abutment plate portion, and the limiting plate portion being connected to a second end of the abutment plate portion. The first end and the second end are disposed opposite to each other, and the limiting plate portion, the abutment plate portion, and the main body plate portion enclose to form a first mounting groove; the metal shielding layer further includes a reinforcing rib, the reinforcing rib having a rectangular ring cross-section, and the reinforcing rib being sleeved and fitted to the inner wall of the first mounting groove; And / or, The metal shielding layer further includes a reinforcing plate, which is connected to the abutting plate portion, and the structural strength of the reinforcing plate is greater than the structural strength of the conductive metal plate.

[0010] According to some embodiments of the present invention, the main body plate portion and the abutment plate portion enclose to form a second mounting groove; the second mounting groove is adapted to place a support plate, and the support plate is adapted to support the test device within the shielded space; And / or, The conductive metal plate also includes an arc-shaped connecting portion, the two ends of which are connected to the main body plate portion. The top end of the arc-shaped connecting portion is adapted to install the wave-absorbing layer. Along the direction perpendicular to the main body plate portion, the height of the arc-shaped connecting portion is greater than or equal to the height of the abutting plate portion.

[0011] According to some embodiments of the present invention, the rod is in the shape of an aluminum profile, and adjacent rods are connected by a first angle bracket; The rods include main rods and auxiliary rods, and at least six main rods are spliced ​​together to form the hexagon of the main frame layer; the two ends of the auxiliary rods are respectively connected to two main rods located on the same surface but in different positions.

[0012] According to some embodiments of the present invention, the placement direction of the auxiliary rod is parallel to the placement direction of the main rod, each conductive metal plate corresponds to at least one auxiliary rod spanning its outer surface, the conductive metal plate and the auxiliary rod are connected by a plurality of second angle brackets, and the symmetry plane of the second angle brackets coincides with the symmetry axis of the conductive metal plate, or the symmetry center of a plurality of second angle brackets coincides with the symmetry axis of the conductive metal plate.

[0013] According to some embodiments of the present invention, the microwave anechoic chamber further includes a door assembly, the conductive metal plate has a connection port, and the door assembly is connected to the conductive metal plate and is adapted to close the connection port; The door assembly includes a door frame portion and a door panel portion. At least one of the door frame portion and the conductive metal plate is provided with a first annular shielding layer surrounding the connection opening. The first annular shielding layer seals and connects the conductive metal plate and the door frame portion. The door frame portion has an opening, and the door panel portion is openable and closable within the opening. At least one of the door panel portion and the door frame portion is provided with a second annular shielding layer surrounding the opening. The second annular shielding layer seals and connects the door frame portion and the door panel portion. The first annular shielding layer, the door frame portion, the second annular shielding layer, and the door panel portion form a shielding cover over the connection port.

[0014] On the other hand, embodiments of the present invention also provide a wireless performance testing device, including the microwave anechoic chamber described above.

[0015] The embodiments of the present invention have at least the following beneficial effects: by overlapping the main frame layer and designing a split metal shielding layer, the traditional integrated welding of the microwave anechoic chamber is transformed into an assembly mode that can be quickly assembled on site, which greatly shortens the construction cycle, reduces manufacturing costs, and gives the microwave anechoic chamber the ability to be disassembled, moved, and flexibly modified; moreover, the application of metal shielding strips effectively replaces continuous welding, which can not only ensure high shielding efficiency at the joints and avoid the risk of leaks, but also simplify the process of leak point investigation and maintenance, which is particularly suitable for the high standards of sealing reliability and engineering feasibility requirements of medium and large anechoic chambers.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the microwave enclosure according to an embodiment of the present invention; Figure 2This is an exploded view of the main frame layer, metal shielding layer, and microwave absorbing layer of the microwave enclosure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the microwave enclosure when the conductive metal plate is used as the base plate in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the microwave enclosure when the conductive metal plate is used as a side plate or top plate according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the assembly of the metal shielding strip and dustproof strip of the microwave enclosure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the door assembly of the microwave enclosure according to an embodiment of the present invention.

[0018] Figure label: 100. Main frame layer; 110. Member; 111. Main member; 112. Auxiliary member; 120. First corner bracket; 130. Second corner bracket; 200. Metal shielding layer; 210. Conductive metal plate; 211. Main body plate; 212. Abutting plate; 213. Limiting plate; 214. Arch-shaped connecting part; 215. Connecting port; 216. First annular shielding layer; 220. Metal shielding strip; 221. Abutting part; 222. Compression part; 230. Dustproof strip; 240. Reinforcing rib; 250. Reinforcing plate; 260. Support plate; 300, Absorbing layer; 400, Door assembly; 410, Door frame; 411, Opening; 420, Door panel; 421, Second annular shielding layer. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0021] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, and "above," "below," "within," etc. are understood to include the stated number. If "first," "second," etc. are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set", "install", and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] Please refer to Figure 1 and Figure 2 As shown, in one aspect, an embodiment of the present invention provides a microwave anechoic chamber, including a main frame layer 100, a metal shielding layer 200, and a microwave absorbing layer 300; the main frame layer 100 includes multiple overlapping and assembled rods 110, and the main frame layer 100 is cubic; the metal shielding layer 200 is sleeved on the inner side of the main frame layer 100, and the metal shielding layer 200 includes multiple conductive metal plates 210 and multiple metal shielding strips 220, the conductive metal plates 210 are laid on the six sides of the main frame layer 100; the metal shielding strips 220 are sealed and abut against the adjacent conductive metal plates 210; the microwave absorbing layer 300 is sleeved on the inner side of the metal shielding layer 200 and connected to the conductive metal plates 210, and the microwave absorbing layer 300 surrounds and forms a shielding space.

[0024] According to an embodiment of the present invention, a microwave anechoic chamber is assembled by overlapping multiple rods 110 to form a cubic main frame layer 100, forming a stable support structure. Subsequently, prefabricated conductive metal plates 210 are laid on the six sides of the frame to form the main body of the metal shielding layer 200. Metal shielding strips 220 are pressed or fixed at the joints of adjacent metal plates to achieve tight sealing and electrical connection of the joints through their elasticity or conductivity, so as to isolate external electromagnetic waves. Finally, a wave-absorbing layer 300 is installed inside the metal shielding layer 200 to completely cover the conductive metal plates 210, which is used to enclose and form an internal shielding space, thus completing the modular assembly of the entire microwave anechoic chamber.

[0025] According to the microwave anechoic chamber of the present invention, the traditional integrated welding of the microwave anechoic chamber is transformed into an assembly mode that can be quickly assembled on site through the overlapping of the main frame layer and the design of the split metal shielding layer 200. This significantly shortens the construction cycle, reduces manufacturing costs, and gives the microwave anechoic chamber the ability to be disassembled, moved, and flexibly modified. Furthermore, the application of the metal shielding strip 220 effectively replaces continuous welding, which can not only ensure high shielding efficiency at the joints and avoid the risk of leaks, but also simplify the process of leak point investigation and maintenance. It is particularly suitable for medium and large-sized anechoic chambers with high standards of sealing reliability and engineering feasibility.

[0026] In this embodiment, the conductive metal plate 210 can be made of galvanized sheet, which has good corrosion resistance and wear resistance; the metal shielding strip 220 can be made of high-frequency shielding mesh or copper strip; of course, the materials of the conductive metal plate 210 and the metal shielding strip 220 can also be other metals with conductive properties, as long as the sealing of the metal shielding layer 200 is guaranteed.

[0027] In some embodiments, combined with Figure 5 As shown, the metal shielding layer 200 also includes a dustproof strip 230, which is sealed against the adjacent conductive metal plates 210 and located on the side of the metal shielding strip 220 away from the shielding space. The dustproof strip 230 effectively prevents external contaminants such as dust and moisture from entering the contact metal shielding strip 220 through the seams between the conductive metal plates 210, preventing the surface of the metal shielding strip 220 from increasing contact resistance due to dust accumulation, oxidation, or corrosion, and maintaining the ideal conductivity and elastic sealing pressure of the metal shielding strip 220 over a long period of time, thus ensuring the long-term stability of the shielding performance.

[0028] In this embodiment, the dustproof strip 230 can be made of silicone strip, rubber strip, etc.

[0029] In some embodiments, combined with Figures 2 to 4 As shown, the conductive metal plate 210 includes a main plate portion 211 and an abutment plate portion 212. The abutment plate portion 212 is connected to the edge of the main plate portion 211 and is arranged at a right angle to the main plate portion 211. A metal shielding strip 220 is provided between the abutment plate portions 212 of adjacent conductive metal plates 210.

[0030] In this embodiment, the integrally formed abutment plate portion 212 increases the abutment area between adjacent conductive metal plates 210, making it easier for the metal shielding strip 220 to adhere to the surface of the abutment plate portion 212, achieving a more uniform and reliable electrical connection, strengthening the shielding continuity at the joint, and being particularly beneficial for suppressing the leakage of high-frequency electromagnetic waves.

[0031] In this embodiment, the width of the abutment plate 212 is greater than 50 mm, which effectively ensures the sealing effect between the abutment plate 212 and the metal shielding strip 220.

[0032] In some embodiments, combined with Figure 5 As shown, the metal shielding strip 220 includes an abutment portion 221 and a compression portion 222. The abutment portion 221 is plate-shaped and is adapted to fit against the abutment plate portion 212 of one of two adjacent conductive metal plates 210. The compression portion 222 is connected to the abutment portion 221. The width of the cross-section of the compression portion 222 is smaller than the width of the cross-section of the abutment portion 221 to reserve deformation space on both sides of the compression portion 222. The compression portion 222 is adapted to abut against the abutment plate portion 212 of the other of two adjacent conductive metal plates 210.

[0033] In this embodiment, the abutment portion 221 serves as a stable mounting reference surface, ensuring a large-area reliable fit with the abutment plate portion 212 of the conductive metal plate 210 on one side, forming a stable anchor point; while the compression portion 222, with a narrower cross-section, is compressed during installation, and its reserved deformation space allows the material to undergo controllable elastic compression, greatly reducing the assembly accuracy requirements. Even if there are minor installation deviations or unevenness of the conductive metal plate 210, the compression portion 222 can ensure a tight fit through adaptive deformation.

[0034] In some embodiments, combined with Figure 3 As shown, the conductive metal plate 210 also includes a limiting plate portion 213, which is parallel to the main plate portion 211. The main plate portion 211 is connected to the first end of the abutment plate portion 212, and the limiting plate portion 213 is connected to the second end of the abutment plate portion 212. The first end and the second end are arranged opposite to each other. The limiting plate portion 213, the abutment plate portion 212 and the main plate portion 211 enclose each other to form a first mounting groove. The metal shielding layer 200 also includes a reinforcing rib 240, which has a rectangular ring cross-section. The reinforcing rib 240 is sleeved and fits against the inner wall of the first mounting groove.

[0035] In this embodiment, by setting a limiting plate 213 and forming a first mounting groove with the abutment plate 212 and the main plate 211, a high-strength closed box-shaped cross-section structure arranged along the edge of the plate is formed. A reinforcing rib 240 with a rectangular ring cross-section is tightly fitted into this groove, which is equivalent to embedding a skeleton at the most easily deformable edge of the conductive metal plate 210. At a relatively low weight cost, the bending stiffness and deformation resistance of the conductive metal plate 210 are greatly improved. Especially when the conductive metal plate 210 serves as the base plate of the entire microwave anechoic chamber, it ensures that it remains absolutely flat under long-term load, thereby maintaining the accuracy and stability of the internal geometry of the entire microwave anechoic chamber and providing a reliable physical reference for high-precision measurements. At the same time, the reinforcing rib 240 is completely encapsulated within the structure of the conductive metal plate 210 itself, without damaging any conductive surface and without any negative impact on the integrity of the electromagnetic shielding, achieving a perfect balance between structural reinforcement and electromagnetic performance.

[0036] In some embodiments, combined with Figure 3 or Figure 4 As shown, the metal shielding layer 200 also includes a reinforcing plate 250, which is connected to the abutment plate portion 212. The structural strength of the reinforcing plate 250 is greater than that of the conductive metal plate 210. By directly connecting the reinforcing plate 250, which has a higher structural strength than the main conductive metal plate 210, to the abutment plate portion 212, it can effectively resist the micro-deformation of the conductive metal plate 210 that may be caused by external stress, internal pressing force, or temperature changes during assembly, transportation, or long-term use, thereby always providing a stable and precise support plane for the metal shielding strip 220.

[0037] In some embodiments, combined with Figure 3 As shown, the main body plate 211 and the abutment plate 212 enclose each other to form a second mounting groove; the second mounting groove is suitable for placing the support plate 260, and the support plate 260 is suitable for supporting the test device in the shielded space.

[0038] In this embodiment, it is understood that when the conductive metal plate 210 is used as the base plate of the entire microwave darkroom, it needs to support the weight of the internal testing equipment. A second mounting groove is formed by the main body plate 211 and the abutment plate 212, within which a support plate 260 is embedded, stably supporting various testing devices within the shielded space and meeting the load-bearing requirements of large equipment or precision testing platforms. Crucially, the support plate 260 is independent of the continuous surface of the conductive metal plate 210, eliminating the need for holes or welded supports on the base plate. This fundamentally avoids the risk of electromagnetic leakage due to damage to the metal shielding layer 200, ensuring the shielding effectiveness of the conductive metal plate 210 when used as the base plate.

[0039] In this embodiment, the support plate 260 can be made of wood, or other insulating material with load-bearing capacity.

[0040] In some embodiments, combined with Figure 4 As shown, the conductive metal plate 210 also includes an arc-shaped connecting portion 214, the two ends of which are connected to the main plate portion 211. The top end of the arc-shaped connecting portion 214 is suitable for mounting the wave-absorbing layer 300. Along the direction perpendicular to the main plate portion 211, the height of the arc-shaped connecting portion is greater than or equal to the height of the abutting plate portion 212.

[0041] In this embodiment, when the conductive metal plate 210 serves as the side or top plate of the microwave anechoic chamber, its edge abutment plate portion 212 and possible limiting plate portion 213 are mainly used to form mounting grooves to achieve shielding connection and structural reinforcement with adjacent plates. If the absorbing layer 300 is directly installed in this area, its thickness is very likely to cause spatial conflict with these protruding structural components. By setting the arc-shaped connecting portion 214 and designing its top (highest point) to be no lower than the height of the abutment plate portion 212, it is equivalent to setting up a dedicated, raised mounting platform on the main plate portion 211. The absorbing layer 300 can be fixed flat and without interference to the top of the arc-shaped connecting portion 214 without completely avoiding all the shielding connections and reinforcement structures below. This ensures that the absorbing layer 300 can achieve continuous coverage of the maximum area, eliminates the hidden danger of uneven installation or gaps caused by structural interference, and thus ensures the uniformity and consistency of the absorption performance.

[0042] At the same time, it ensures the universality of the main structure of the conductive metal plate 210 (main plate part 211 and abutment plate part 212) when assembling the side plate, top plate or bottom plate of the microwave dark box, which greatly reduces the assembly cost of the microwave dark box.

[0043] In some embodiments, combined with Figure 2 As shown, the rod 110 is in the shape of an aluminum profile, and adjacent rods 110 are connected by a first angle bracket 120; the rod 110 includes main rods 111 and auxiliary rods 112, and at least six main rods 111 are spliced ​​to form the hexagon of the main frame layer 100; the two ends of the auxiliary rods 112 are respectively connected to two main rods 111 located on the same surface but in different positions.

[0044] In this embodiment, standardized aluminum profile rods 110 are used to achieve rapid assembly of the main frame layer 100. Adjacent rods 110 are connected by first angle brackets 120, forming a highly modular, weld-free overlapping system, which greatly simplifies the on-site installation process and significantly shortens the construction cycle. The basic outline of the cube is quickly constructed by at least six main rods 111, ensuring the accuracy and stability of the overall shape. The auxiliary rods 112 increase the structural strength of each wall of the main frame layer 100, effectively improving the local stiffness of each surface and suppressing deformation that may be caused by self-weight or external loads, providing an extremely flat and stable support reference surface for the inner metal shielding layer 200.

[0045] In some embodiments, combined with Figure 2 and Figure 1As shown, the placement direction of the auxiliary rod 112 is parallel to the placement direction of the main rod 111. Each conductive metal plate 210 corresponds to at least one auxiliary rod 112 spanning its outer surface. The conductive metal plate 210 and the auxiliary rod 112 are connected by several second angle brackets 130. The symmetry plane of the second angle bracket 130 coincides with the symmetry axis of the conductive metal plate 210, or the symmetry center of multiple second angle brackets 130 coincides with the symmetry axis of the conductive metal plate 210.

[0046] In this embodiment, the auxiliary rod 112 is arranged parallel to each other and spans the middle of the outer surface of the conductive metal plate 210. The second angle bracket 130 ensures that its connection point falls precisely near the axis of symmetry of the metal plate, effectively providing support and constraint for the conductive metal plate 210 at its most effective stress center. During assembly, this design allows externally applied fastening forces to be transmitted more evenly to the periphery of the conductive metal plate 210 (especially to the edges where the abutment plates 212 are located) through the second angle bracket 130 and the auxiliary rod 112 in the middle. This constraint method, exerting force from the center, more effectively compresses the metal shielding strip 220 between the abutment plates 212 of adjacent conductive metal plates 210, ensuring the sealing effect of the metal shielding strip 220 and improving the shielding effectiveness at the joints.

[0047] In this embodiment, the spacing between the bolts connected to the second corner bracket 130 is controlled between 100 mm and 130 mm to ensure the pressure resistance of the conductive metal plate 210 against the metal shielding strip 220.

[0048] In other embodiments, the connection position between the conductive metal plate 210 and the auxiliary rod 112 or the main rod 111 may be set at the edge of the guide metal plate.

[0049] In some embodiments, combined with Figure 6 As shown, the microwave anechoic chamber also includes a door assembly 400. A conductive metal plate 210 has a connection port 215. The door assembly 400 is connected to the conductive metal plate 210 and is adapted to close the connection port 215. The door assembly 400 includes a door frame portion 410 and a door panel portion 420. At least one of the door frame portion 410 and the conductive metal plate 210 is provided with a first annular shielding layer 216 surrounding the connection port 215. The first annular shielding layer 216 seals the conductive metal plate 210 and the door frame portion 410. The door frame portion 410 has an opening 411. The door panel portion 420 is openable and closeable at the opening 411. At least one of the door panel portion 420 and the door frame portion 410 is provided with a second annular shielding layer 421 surrounding the opening 411. The second annular shielding layer 421 seals the door frame portion 410 and the door panel portion 420. The first annular shielding layer 216, the door frame portion 410, the second annular shielding layer 421, and the door panel portion 420 form a shielding cover covering the connection port 215.

[0050] In this embodiment, by setting the first annular shielding layer 216, a continuous and robust electromagnetic seal is first established between the door frame portion 410 and the conductive metal plate 210; the second annular shielding layer 421 forms another independent, repeatedly openable and closable dynamic sealing interface between the door frame portion 410 and the movable door panel portion 420. This allows the entire door assembly 400 to first form a complete shielding cover, and then connect to the conductive metal plate 210 as a whole unit. This significantly improves the overall shielding effectiveness of the door assembly 400, especially its ability to suppress high-frequency signals; and the independent disassembly and assembly of the door assembly 400 effectively adapts to the expansion of microwave anechoic chambers, improving the flexibility of microwave anechoic chamber design and assembly.

[0051] In this embodiment, the first annular shielding layer 216 can be made of copper wire, and there are two layers; the second annular shielding layer 421 can be made of beryllium copper finger springs; of course, the first annular shielding layer 216 and the second annular shielding layer 421 can also be made of other conductive shielding materials, such as conductive metals (zinc, iron), etc.

[0052] The microwave anechoic chamber of this invention overcomes the technical bottleneck of application frequency coverage of 300MHz-90GHz and shielding performance greater than 80dB, ensuring that the microwave anechoic chamber can stably and accurately carry out testing within this frequency range.

[0053] On the other hand, embodiments of the present invention also provide a wireless performance testing device, including a microwave anechoic chamber as described in the above embodiments.

[0054] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A microwave dark box characterized in that, The application relates to a shielding device, which comprises the following parts: a main frame layer (100) comprising a plurality of rod members (110) assembled in a lap joint mode, the main frame layer (100) being in a cubic shape; a metal shielding layer (200) sleeved on the inner side of the main frame layer (100), the metal shielding layer (200) comprising a plurality of conductive metal plates (210) and a plurality of metal shielding strips (220), the conductive metal plates (210) being paved on the six surfaces of the main frame layer (100), and the metal shielding strips (220) being sealed and abutted between adjacent conductive metal plates (210); a wave-absorbing layer (300) sleeved on the inner side of the metal shielding layer (200) and connected to the conductive metal plates (210), the wave-absorbing layer (300) being arranged to form a shielding space.

2. The microwave dark box of claim 1, wherein, The metal shielding layer (200) further comprises a dustproof strip (230) sealed and abutted between adjacent conductive metal plates (210) and located on the side of the metal shielding strip (220) away from the shielding space.

3. The microwave dark box of claim 1, wherein, The conductive metal plate (210) comprises a main plate part (211) and an abutment plate part (212), the abutment plate part (212) being connected to the edge of the main plate part (211) and arranged at a right angle with the main plate part (211), and the metal shielding strip (220) being arranged between the abutment plate parts (212) of adjacent conductive metal plates (210).

4. The microwave dark box of claim 3, wherein, The metal shielding strip (220) comprises an abutment part (221) and a compression part (222), the abutment part (221) being in a plate shape, and the abutment part (221) being adapted to fit the abutment plate part (212) of one of the two adjacent conductive metal plates (210); the compression part (222) being connected to the abutment part (221), the width of the cross section of the compression part (222) being smaller than the width of the cross section of the abutment part (221) to reserve a deformation space on both sides of the compression part (222), and the compression part (222) being adapted to abut the abutment plate part (212) of the other of the two adjacent conductive metal plates (210).

5. The microwave dark box of claim 3, wherein, The conductive metal plate (210) further comprises a limiting plate part (213) parallel to the main plate part (211), the main plate part (211) being connected to the first end of the abutment plate part (212), the limiting plate part (213) being connected to the second end of the abutment plate part (212), the first end and the second end being oppositely arranged, and the limiting plate part (213), the abutment plate part (212) and the main plate part (211) forming a first mounting groove; and / or, the metal shielding layer (200) further comprises a reinforcing plate (250) connected to the abutment plate part (212), and the structural strength of the reinforcing plate (250) is greater than that of the conductive metal plate (210).

6. The microwave dark box of claim 3, wherein, The main plate part (211) and the abutting plate part (212) enclose a second installation groove; the second installation groove is suitable for placing a support plate (260), and the support plate (260) is suitable for supporting a testing device in the shielding space; And / or, The conductive metal plate (210) further comprises an arc-shaped connecting part (214), two ends of the arc-shaped connecting part (214) are connected to the main plate part (211), and the top end of the arc-shaped connecting part (214) is suitable for mounting the wave-absorbing layer (300); in the direction perpendicular to the main plate part (211), the height of the arc-shaped connecting part is greater than or equal to the height of the abutting plate part (212).

7. The microwave dark box according to any one of claims 1 to 6, characterized in that The rod member (110) is in the shape of aluminum profile, and adjacent rod members (110) are connected through first corner connectors (120); The rod member (110) comprises a main rod member (111) and an auxiliary rod member (112), and at least six main rod members (111) are spliced to form six sides of the main frame layer (100); two ends of the auxiliary rod member (112) are respectively connected to two main rod members (111) located on the same plane and at different positions.

8. The microwave dark box of claim 7, wherein, The placement direction of the auxiliary rod member (112) is parallel to the placement direction of the main rod member (111), each conductive metal plate (210) corresponds to at least one auxiliary rod member (112) across the outer surface thereof, the conductive metal plate (210) and the auxiliary rod member (112) are connected through a plurality of second corner connectors (130), and the symmetry plane of the second corner connector (130) coincides with the symmetry axis of the conductive metal plate (210), or the symmetry centers of the plurality of second corner connectors (130) coincide with the symmetry axis of the conductive metal plate (210).

9. The microwave dark box according to any one of claims 1 to 6, characterized in that The microwave dark box further comprises a door assembly (400), the conductive metal plate (210) is provided with a connecting port (215), and the door assembly (400) is connected to the conductive metal plate (210) and is suitable for closing the connecting port (215); The door assembly (400) comprises a door frame part (410) and a door plate part (420), at least one of the door frame part (410) and the conductive metal plate (210) is provided with a first annular shielding layer (216) surrounding the connecting port (215), and the first annular shielding layer (216) sealingly connects the conductive metal plate (210) and the door frame part (410); the door frame part (410) is provided with an opening (411), the door plate part (420) is opened and closed in the opening (411), and at least one of the door frame part (410) and the door plate part (420) is provided with a second annular shielding layer (421) surrounding the opening (411), and the second annular shielding layer (421) sealingly connects the door frame part (410) and the door plate part (420); The first annular shielding layer (216), the door frame part (410), the second annular shielding layer (421), and the door plate part (420) form a shielding cover covering the connecting port (215).

10. A wireless performance test apparatus, characterized by, The microwave dark box comprises the microwave dark box according to any one of claims 1 to 9.

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