A dark box for OTA testing

Abstract

This utility model relates to the field of OTA testing technology, and in particular to a dark box for OTA testing, including a dark box body. The inner wall of the dark box body is provided with a wave-absorbing assembly, which includes multiple wave-absorbing elements. The wave-absorbing elements are detachably connected to the inner wall of the dark box body through a detachable connection assembly. The detachable connection assembly includes a limiting unit for restricting the movement of the wave-absorbing elements and a fastening unit for tightly splicing two adjacent wave-absorbing elements. This utility model uses a detachable connection assembly to detachably connect the wave-absorbing elements to the inner wall of the dark box body, which facilitates the independent disassembly and replacement of individual wave-absorbing elements without damaging the overall structure.

Description

Technical Field

[0001] This utility model relates to the field of OTA testing technology, and in particular to a dark box for OTA testing. Background Technology

[0002] In OTA performance testing of wireless communication devices, the OTA test chamber absorbs electromagnetic waves through internal absorbing materials to simulate a free-space propagation environment, making it a key device for ensuring test accuracy. However, the absorbing materials on the inner wall of the test chamber are often directly glued to the inner wall with adhesive or double-sided tape. Although this method is simple, the absorbing materials are prone to peeling and curling after aging. Replacing them not only requires a lot of time to clean the residual adhesive, but may also damage the inner wall of the chamber. Some also use a suspended installation method, using hooks or frames to suspend the absorbing materials. This method has poor stability and is prone to displacement due to slight vibrations, affecting the absorption effect.

[0003] Based on the above situation, it is necessary to design a black box for OTA testing to solve the above problems. Utility Model Content

[0004] This invention provides a dark box for OTA testing to solve the problem of inconvenient installation of absorbing materials in existing dark boxes.

[0005] The technical problem solved by this utility model is achieved by the following technical solution:

[0006] An OTA testing dark box includes a dark box body, and an absorbing assembly is provided on the inner wall of the dark box body. The absorbing assembly includes multiple absorbing elements, and the absorbing elements are detachably connected to the inner wall of the dark box body through a detachable connection assembly. The detachable connection assembly includes a limiting unit for restricting the movement of the absorbing elements and a fastening unit for tightly splicing two adjacent absorbing elements.

[0007] Preferably, the limiting unit includes an insertion slot formed on the inner wall of the darkroom and an insertion rod that can be inserted into the insertion slot. The insertion rod is connected to the wave-absorbing component, and the insertion rod is provided with an elastic retaining plate. The inner wall of the insertion slot is provided with a retaining groove corresponding to the elastic retaining plate.

[0008] Preferably, the elastic plate is provided with anti-slip protrusions.

[0009] Preferably, the opening of the insertion slot is provided with a flared portion.

[0010] Preferably, the fastening unit includes a serrated engagement portion provided on the side wall of the absorber, and two adjacent serrated engagement portions engage with each other to achieve a tight connection between two adjacent absorbers.

[0011] Preferably, the inner wall of the sawtooth meshing part is provided with an elastic wave-absorbing strip. When the two sawtooth meshing parts mesh with each other, the two elastic wave-absorbing strips squeeze each other to fill the gap between the sawtooths.

[0012] The beneficial effects of this utility model are: the detachable connection component allows for the detachable connection between the absorbing component and the inner wall of the darkroom, making it easy to disassemble and replace a single absorbing component independently without damaging the overall structure. At the same time, the sawtooth structure achieves a tight physical connection through mechanical interlocking, ensuring the structural stability and electromagnetic sealing of the device during long-term use and improving the OTA testing effect. Attached Figure Description

[0013] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the isometric structure provided by this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the two interlocking serrations of this utility model when they are separated;

[0016] Figure 3 A schematic diagram of the cross-sectional structure of the limiting unit provided by this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the absorbing element in this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the absorbing component in this utility model when it is separated from the inner wall of the darkroom.

[0019] In the diagram, 1 is the darkroom enclosure; 2 is the wave-absorbing component; 3 is the limiting unit; 31 is the insertion slot; 32 is the insertion rod; 33 is the elastic clamping plate; 34 is the clamping slot; 4 is the fastening unit; 41 is the serrated engagement part; 42 is the elastic wave-absorbing strip; 5 is the anti-slip protrusion; and 6 is the flared part. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0021] Reference Figures 1-5As shown, an OTA testing dark box includes a dark box body 1. The inner wall of the dark box body 1 is equipped with a wave-absorbing component. The size of the dark box body 1 is not limited and can be customized according to the wireless communication device to be tested. The dark box body 1 can block external electromagnetic waves through a metal shielding shell to avoid interference with the test signal. This is prior art, which should be known to those skilled in the art and will not be elaborated further here. The wave-absorbing component includes multiple wave-absorbing elements 2. The wave-absorbing elements 2 can be made of materials such as polyurethane foam-based absorbers that can absorb electromagnetic waves emitted by the device and avoid reflection interference with the test results. They can also be designed in a cone shape. When electromagnetic waves are incident on the cone-shaped absorbing material, multiple reflections, scattering, and absorption occur at the cone tip, gradually reducing the energy of the electromagnetic waves. The absorption component 2 is detachably connected to the inner wall of the darkroom 1 via a detachable connection assembly. The detachable connection assembly includes a limiting unit 3 for restricting the movement of the absorption component 2 and a fastening unit 4 for tightly splicing two adjacent absorption components 2. After long-term use, the absorption material is prone to delamination and curling after aging. At this time, it is only necessary to remove and replace the individual damaged absorption component 2 through the detachable connection assembly. There is no need to replace the entire absorption component 2 or damage the overall structure. After the absorption component 2 is installed, the two adjacent absorption components 2 are tightly spliced ​​together by the fastening unit 4 to avoid the electromagnetic waves from diffracting through the gaps between the absorption components 2, which would cause local absorption failure.

[0022] Reference Figures 3-4 As shown, further, the limiting unit 3 includes an insertion slot 31 formed on the inner wall of the dark box 1 and an insertion rod 32 that can be inserted into the insertion slot 31. The insertion rod 32 is connected to the wave-absorbing component 2. The insertion rod 32 is provided with an elastic locking plate 33. The inner wall of the insertion slot 31 is provided with a locking groove 34 corresponding to the elastic locking plate 33. When installing the wave-absorbing component 2, the wave-absorbing component 2 can be held by hand to drive the insertion rod 32 to align with the insertion slot 31 and insert it into the insertion slot 31. At this time, the elastic locking plate 33 will deform after being subjected to the resistance force against the insertion slot 31. When the elastic locking plate 33 moves to the locking position... When the groove 34 is aligned, it recovers its deformation and snaps into the snap-fit ​​groove 34, thereby fixing the plug rod 32 in the snap-fit ​​groove 31. This allows the wave-absorbing component 2 to be installed on the inner wall of the dark box 1. The plug rod 32 can be provided with multiple elastic plates 33 along its length extension direction to improve the fixing effect. During disassembly, the plug rod 32 can be simply pulled out of the snap-fit ​​groove 34. The elastic plates 33 can be made of arched arc-shaped springs or the like, and anti-slip protrusions 5 are provided on the elastic plates 33 to further reduce the possibility of the elastic plates 33 moving out of the snap-fit ​​groove 34, thereby further improving the installation stability of the wave-absorbing component 2.

[0023] In order to facilitate the precise insertion of the plug rod 32 into the plug slot 31, the opening of the plug slot 31 is provided with a flared part 6. The flared part 6 can increase the opening of the plug slot 31 and make it easier to insert the plug rod into the plug slot 31.

[0024] Reference Figure 2 As shown, the fastening unit 4 further includes a serrated engagement portion 41 provided on the side wall of the absorber 2, and two adjacent serrated engagement portions 41 engage with each other to achieve a tight connection between two adjacent absorbers 2. The serrated engagement portion 41 can be made of the same absorber material as the absorber 2. When subjected to force, the inclined tooth surface of the serrated structure will generate a coupling effect of horizontal and vertical components. Compared with the planar absorbers 2, the connection is tighter, so as to achieve a physical tight connection, ensure the structural stability and electromagnetic sealing of long-term use, and improve the OTA test effect.

[0025] Furthermore, the inner wall of the sawtooth meshing part 41 is provided with elastic absorbing strips 42. When the two sawtooth meshing parts 41 mesh with each other, the two elastic absorbing strips 42 squeeze each other to fill the gap between the sawtooths. When not meshing, the absorbing strips protrude from the inner wall of the sawtooth meshing part 41. When the two sawtooth meshing parts 41 mesh with each other, they will squeeze the two elastic absorbing strips 42. When electromagnetic waves irradiate the tooth surface, part of them are reflected by the tooth peak absorbing material, and part of them enter the gap and are absorbed by the absorbing strips. The elastic absorbing strips 42 can be a strip-shaped structure made of elastic materials such as rubber, silicone, foamed polyurethane and absorbing materials such as ferrite, carbon-based composite materials, magnetic micro powder, etc. When the two sawtooth meshing parts 41 mesh with each other, the elastic absorbing strips 42 will deform due to compression, filling the tiny gaps between the sawtooths, and at the same time, the electromagnetic properties of the material itself will achieve the wave absorption function.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dark box for OTA test, comprising a dark box body (1), a wave absorbing assembly is arranged on the inner wall of the dark box body (1), characterized in that, The absorbing assembly includes multiple absorbing elements (2). The absorbing elements (2) are detachably connected to the inner wall of the dark box (1) via a detachable connection assembly. The detachable connection assembly includes a limiting unit (3) for restricting the movement of the absorbing elements (2) and a fastening unit (4) for tightly splicing two adjacent absorbing elements (2).

2. The dark box for OTA testing according to claim 1, characterized in that, The limiting unit (3) includes a slot (31) opened on the inner wall of the dark box (1) and a plug rod (32) that can be inserted into the slot (31). The plug rod (32) is connected to the wave-absorbing component (2). The plug rod (32) is provided with an elastic plate (33). The inner wall of the slot (31) is provided with a locking groove (34) corresponding to the elastic plate (33).

3. The dark box for OTA testing according to claim 2, characterized in that, The elastic plate (33) is provided with anti-slip protrusions (5).

4. The dark box for OTA testing according to claim 2, wherein, The opening of the insertion slot (31) is provided with a flared part (6).

5. The dark box for OTA testing according to claim 1, characterized in that, The fastening unit (4) includes a serrated engagement portion (41) provided on the side wall of the wave absorber (2), and two adjacent serrated engagement portions (41) engage with each other to achieve a tight connection between two adjacent wave absorbers (2).

6. The dark box for OTA testing according to claim 5, characterized in that, The inner wall of the sawtooth engagement part (41) is provided with an elastic wave-absorbing strip (42). When the two sawtooth engagement parts (41) engage with each other, the two elastic wave-absorbing strips (42) squeeze each other to fill the gap between the sawtooth teeth.

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