Radar test anechoic chamber

Abstract

The utility model discloses a radar test darkroom belongs to the technical field of electromagnetic shielding, and the radar test darkroom includes shielding casing, and the top surface of shielding casing is keel grid structure, is provided with fire control pipeline in the top surface of shielding casing, is provided with the wave -absorbing corner pyramid in the inboard of shielding casing, is installed with shielding door, waveguide window and signal adapter board on the side of shielding casing, is provided with the power supply system in shielding casing, and the power supply system is connected with outside through power filter, and the circuit in power filter has filter circuit. The utility model adopts the mode that shielding casing combines keel grid top surface structure, reaches the purpose that structural strength and electromagnetic shielding performance are given full play to, and the mode that fire control pipeline is integrated in the top surface keel grid and is arranged zigzag, reaches the purpose that hidden fire control monitoring and space efficient utilization through the collaborative installation of infrared detector, sampling pipe and sampling head, realizes the technical effect that fire control system and electromagnetic environment are compatible.

Description

Technical Field

[0001] This utility model relates to a radar testing anechoic chamber, belonging to the technical field of shielding equipment or components from electric or magnetic fields. Background Technology

[0002] With the rapid development of radar technology, the testing needs of radar systems are increasing, especially in terms of the electromagnetic shielding performance, wave absorption performance, and safety of the testing environment. As a key facility for radar system performance testing, the radar anechoic chamber must possess excellent electromagnetic shielding characteristics, a low-reflection environment, and reliable fire protection capabilities to ensure the accuracy of test data and the safety of the testing process.

[0003] Existing radar test anechoic chambers typically employ a metal shielded shell structure, with radar-absorbing materials laid inside to simulate a free-space environment. However, existing anechoic chamber designs suffer from the following problems:

[0004] There is a trade-off between structural strength and electromagnetic shielding performance. Anechoic chamber ceilings typically employ large-area welded steel plate structures to ensure shielding effectiveness, but excessively heavy ceiling structures increase building load-bearing requirements and construction costs. Simultaneously, the layout of fire protection piping often conflicts with the shielding structure, complicating construction.

[0005] The fire protection system suffers from inadequate compatibility. In conventional anechoic chambers, fire protection piping is often exposed, which not only affects the installation of absorbing materials but may also interfere with test results due to reflections from the metal piping. Furthermore, traditional smoke detectors are susceptible to interference in the high electromagnetic field environment of an anechoic chamber, resulting in a high false alarm rate.

[0006] There are certain defects and hidden dangers in the ventilation and heat dissipation design. Darkrooms need to operate in a sealed environment for a long time, but existing ventilation waveguide windows mostly use simple honeycomb structures, which make it difficult to balance shielding effectiveness and ventilation efficiency. The heat dissipation problem of lighting fixtures is also often overlooked, resulting in a shortened lifespan of lighting equipment due to overheating.

[0007] There may be magnetic interference issues with the power supply and distribution system. Ordinary power supply filters have limited filtering effectiveness at high frequencies and may introduce additional noise, affecting radar testing accuracy.

[0008] The existing technologies have not yet provided a perfect and reliable solution to the above problems and can no longer meet people's requirements, so they urgently need to be improved. Utility Model Content

[0009] The purpose of this invention is to provide a radar testing anechoic chamber that comprehensively solves the structural, shielding, fire protection, and heat dissipation problems in existing technologies, providing a high-precision and high-reliability environment for radar testing.

[0010] This utility model provides the following solution:

[0011] A radar testing anechoic chamber includes a shielded shell with a keel grid structure on the top surface. A fire-fighting pipe is installed inside the top surface of the shielded shell. A wave-absorbing cone is installed on the inner side of the shielded shell. A shielded door, a waveguide window, and a signal adapter board are installed on the side of the shielded shell. A power supply and distribution system is installed inside the shielded shell. The power supply and distribution system is connected to the outside through a power filter, and the power filter has a filtering circuit inside.

[0012] Furthermore, the keel grid structure includes a top main beam, a top ring beam, and a top keel. The top ring beam is set along the edge of the top of the radar test anechoic chamber. A shielding steel plate is welded and laid on the keel grid structure. The grid spacing in the keel grid structure is 1m.

[0013] Furthermore, the fire-fighting pipeline includes an infrared detector, a sampling tube, and a sampling head. The fire-fighting pipeline is arranged in a tortuous manner at the top of the radar test anechoic chamber. The infrared detector is installed on the sampling tube or around the sampling tube, and sampling heads are connected between adjacent sampling tubes.

[0014] Furthermore, the waveguide window includes a ventilation waveguide window and a lamp heat dissipation waveguide window. The ventilation waveguide window is installed at the air inlet and air outlet of the darkroom, and the lamp heat dissipation waveguide window is installed on the combined lamp box, which is installed on the top surface of the darkroom.

[0015] Furthermore, the ventilation waveguide window is welded onto a steel plate on one side of the shielding housing, and includes a connecting duct flange and a duct. The duct is fixedly connected to the connecting duct flange by a crimping plate, and the window body of the ventilation waveguide window is installed inside the duct.

[0016] Furthermore, the signal adapter board is equipped with an RF shielded adapter and a waveguide, and the signal conversion board is mounted on a steel plate on one side of the shielded housing.

[0017] Furthermore, the RF shielding adapter is an SMA dual-female adapter.

[0018] Furthermore, the waveguide is a six-way quincunx waveguide and a single DN50 straight-through waveguide.

[0019] Furthermore, the signal adapter board has dimensions of 350mm × 300mm.

[0020] Furthermore, the filter circuit includes an input terminal and an output terminal. The input terminal is connected to one side of the first inductor, and the other side of the first inductor is connected across the two ends of the first capacitor and the second capacitor. The second capacitor is a variable capacitor. The first capacitor is connected to one side of the second inductor, and the other side of the second inductor is connected to the output terminal.

[0021] This utility model has the following advantages compared with the prior art:

[0022] In the radar testing anechoic chamber provided by this utility model, a shielded shell combined with a keel grid top structure is adopted, and the grid spacing and welded shielding steel plate are optimized to achieve a balance between structural strength and electromagnetic shielding performance. This utility model integrates fire-fighting pipelines into the top keel grid and arranges them in a winding manner. Through the coordinated installation of infrared detectors, sampling tubes, and sampling heads, it achieves concealed fire monitoring and efficient space utilization, thereby realizing the technical effect of compatibility between the fire-fighting system and the electromagnetic environment. It solves the technical problems of reflection interference and high false alarm rates caused by interference from the absorbing materials and test signals due to the installation of fire-fighting pipelines.

[0023] This utility model adopts a separate design for the ventilation waveguide window and the lamp heat dissipation waveguide window. By welding and fixing the ventilation waveguide window and integrating the heat dissipation lamp box, the purpose of balancing shielding effectiveness and ventilation and heat dissipation requirements is achieved, thereby realizing stable airflow circulation and long-term operation of the equipment. Furthermore, by using a built-in high-frequency filter circuit, the purpose of suppressing wide-band electromagnetic noise is achieved, thereby realizing the technical effect of high-precision acquisition of radar test data. This solves the technical problem of power interference affecting test results caused by insufficient high-frequency attenuation of ordinary filters. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the radar testing anechoic chamber.

[0026] Figure 2 This is the circuit diagram of a filter circuit.

[0027] Figure 3 This is a structural diagram of the keel grid structure.

[0028] Figure 4 This is a structural diagram of a ventilation waveguide window. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the specific implementation of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] like Figure 1 and Figure 2 The radar test anechoic chamber shown includes a shielded housing 1, which has at least two sides 12 and 13. The top surface 11 of the shielded housing 1 has a keel grid structure. Fire-fighting pipes are installed inside the top surface 11 of the shielded housing 1. Wave-absorbing cones are installed on the inner side of the shielded housing 1. Shielding doors 121 are installed on the sides 12 of the shielded housing 1. Waveguide windows and signal adapter boards can also be installed. A power supply and distribution system is installed inside the shielded housing 1. The power supply and distribution system is connected to the outside through a power filter. The power filter has a filtering circuit inside.

[0031] As a further improvement to this utility model, the fire-fighting pipeline includes a sampling pipe 111, a sampling head 112, and an infrared detector 113. The fire-fighting pipeline is arranged in a tortuous manner at the top of the radar test anechoic chamber. The infrared detector 113 is installed on the sampling pipe 111 or around the sampling pipe 111. The sampling head 112 is connected between adjacent sampling pipes 111.

[0032] In the radar anechoic chamber fire monitoring system provided by this utility model, a full-coverage sampling network is formed by sampling tubes 111 arranged in a meandering pattern along the top. Sampling heads 112 are connected to adjacent sampling tubes 111 for multi-point continuous sampling. Infrared detectors 113 are installed nearby on or around the sampling tubes 111 for real-time heat source detection. When the radar anechoic chamber faces a possible fire, it can identify and locate the fire early, thus achieving second-level response to fire signals, monitoring without blind spots, and no conflict with the anechoic chamber's shielding structure. Existing point smoke detectors are sparsely deployed and have electromagnetic shielding limitations, which easily lead to large detection blind spots, delayed response, and false alarms or missed alarms. The radar anechoic chamber fire monitoring system provided by this utility model solves the above-mentioned defects.

[0033] like Figure 2 As shown, as a further improvement to this utility model, the filter circuit includes an input terminal and an output terminal. The input terminal is connected to one side of the first inductor L1, and the other side of the first inductor L1 is connected across the two ends of the first capacitor C1 and the second capacitor C2. The second capacitor C2 is a variable capacitor. The first capacitor C1 is connected to one side of the second inductor L2, and the other side of the second inductor L2 is connected to the output terminal.

[0034] In the filter circuit of this invention, the second capacitor C2 is made into a controlled variable capacitor, so that the second capacitor C2 and the fixed inductor L1 of the first stage form a parallel LC resonant circuit. By changing the capacitance value of the second capacitor C2, the parallel resonant frequency fp of the first stage filter circuit can be changed synchronously. The parallel resonant frequency satisfies the following formula:

[0035] fp≈1 / (2π√(L1·C2)).

[0036] As can be seen from the above formula, a high-impedance trap (notch) can be formed at the parallel resonant frequency fp, which short-circuits the switching noise of the corresponding radar test frequency band to ground, and achieves accurate filtering in the second-stage filter circuit.

[0037] In some implementations, the second capacitor C2 can be a varactor diode, a MEMS capacitor array, or a switched capacitor array. Through the aforementioned specific variable capacitor, the second-stage filter circuit can achieve precise filtering.

[0038] like Figure 3 As shown, as a further improvement to this utility model, the keel grid structure 2 includes a top main beam 21, a top ring beam 22, and a top keel 23. The top ring beam 22 is set along the edge of the top of the radar test anechoic chamber. A shielding steel plate is welded and laid on the keel grid structure 2. The grid spacing of the keel grid structure 2 is 1m.

[0039] In the top shielding structure of the radar test anechoic chamber, an integrated keel grid consisting of a top main beam 21, a top ring beam 22, and a top keel 23, along with a fully welded shielding steel plate, is adopted. The top ring beam is continuously arranged around the perimeter to form a rigid frame, and the top main beam and the top keel intersect to form a 1m equally spaced grid to provide multi-point support. The shielding steel plate and the grid are fully welded to form a seamless whole, making the shielding anechoic chamber structure relatively lightweight while maintaining a high-rigidity mechanical structure, resisting deformation over a long period, and ensuring stable shielding attenuation. Compared with the segmented assembly or bolted connection of the prior art, which may cause joint leakage, cumulative structural deformation, and attenuation of shielding performance, the top shielding structure of this utility model solves the above problems.

[0040] like Figure 4 As shown, as a further improvement to this utility model, the waveguide window includes a ventilation waveguide window and a lamp heat dissipation waveguide window. The ventilation waveguide window is installed at the air inlet and air outlet of the darkroom, and the lamp heat dissipation waveguide window is installed on the combined lamp box, which is installed on the top surface of the darkroom. Figure 4The structure of the ventilation waveguide window is schematically shown. The ventilation waveguide 3 includes: a shielding steel plate 31, a frame 32, a pressing plate 33, and a duct 34. The ventilation waveguide window is welded to the steel plate on one side of the shielding shell and includes a connecting duct flange (not shown in the figure) and a duct 34. The duct 34 is fixedly connected to the connecting duct flange through the pressing plate 33. The window body of the ventilation waveguide window is installed inside the duct 34, and the frame 32 is used to connect the duct flange.

[0041] In the waveguide window structure provided by this utility model, the waveguide window is divided into a ventilation waveguide window and a lamp heat dissipation waveguide window. The ventilation waveguide window is installed at the air inlet and return air outlet of the anechoic chamber, and the lamp heat dissipation waveguide window is installed on the combined lamp box. The ventilation waveguide window and the lamp heat dissipation waveguide window together achieve the purpose of optimizing the coordinated work of ventilation and heat dissipation inside the anechoic chamber, thereby realizing the integrated effect of shielding and heat dissipation of the radar test anechoic chamber. In the existing shielded anechoic chambers, the ventilation and heat dissipation functions are separated, which can easily lead to structural complexity and reduced shielding effectiveness. However, the ventilation waveguide window and the lamp heat dissipation waveguide window provided by this utility model realize the unification of ventilation and heat dissipation functions, improve the shielding effectiveness and heat dissipation effectiveness, and reduce the structural complexity of the radar test shielded anechoic chamber. Taking the ventilation waveguide window as an example, the ventilation waveguide window is fixed to the shielding shell by welding. The ventilation waveguide window includes a shielding steel plate 31, a frame 32, a pressure plate 33, and a duct 34. The airtightness is ensured by the fixed connection between the duct flange and the duct 34. The frame 32 is used to provide the stability of the overall structure. The ventilation waveguide window achieves a balance between air circulation and equipment heat dissipation in the darkroom, thereby improving the overall environmental control capability of the darkroom.

[0042] As a further improvement to this utility model, the signal adapter board is equipped with an RF shielded adapter and a waveguide, and the signal conversion board is mounted on a steel plate on one side of the shielded housing. An exemplary RF shielded adapter is an SMA dual-female adapter, the waveguide is a six-channel staggered waveguide and a single DN50 straight-through waveguide, and the signal adapter board measures 350mm × 300mm.

[0043] The signal adapter board provided by this utility model adopts a modular design with an overall size of 350mm×300mm. The body of the signal adapter board is made of high-strength aluminum alloy or galvanized steel plate to ensure mechanical strength and electromagnetic shielding performance. It integrates and installs multiple radio frequency shielding adapters to achieve high shielding efficiency, and has a compact layout and great scalability.

[0044] This invention integrates two waveguide structures in the signal adapter board to meet different signal transmission requirements. One of the waveguide structures is a six-channel quincunx waveguide. The six-channel quincunx waveguide adopts a hexagonal honeycomb structure design, suitable for parallel transmission of multiple medium-to-high frequency signals (e.g., 1GHz to 18GHz). It offers high isolation between multiple channels, reducing crosstalk interference. The DN50 straight-through waveguide uses a large-diameter circular waveguide, suitable for low-frequency or high-power signal transmission (e.g., microwave, radar signals), reducing transmission loss while ensuring low-frequency, high-power signal transmission. The waveguides are connected to the signal adapter board via flange pressing or welding. The waveguide interior can be filled with absorbing material to further suppress standing waves and reflection interference.

[0045] The RF shielded adapter receives RF signals and performs filtering and noise reduction, while the waveguide ensures low-loss signal transmission. Through the coordinated operation of the RF shielded adapter and the waveguide, stable signal transmission from external equipment to the anechoic chamber is ensured. The signal adapter board and the shielded housing form a complete shielding layer, which, combined with the cutoff frequency characteristics of the waveguide, effectively prevents high-frequency electromagnetic leakage, meeting EMC testing requirements.

[0046] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with their meaning in the relevant technical context and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0047] It should be noted that certain terms are used in the specification and claims of this utility model to refer to specific elements. Those skilled in the art will understand that different manufacturers or producers may use different terms to refer to the same element. The specification and claims of this utility model do not distinguish elements based on differences in terminology, but rather on differences in function.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the specification of this utility model.

[0049] In the description of this utility model, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A radar testing anechoic chamber, characterized in that, The radar test anechoic chamber includes a shielded shell with a keel grid structure on the top surface. Fire-fighting pipes are installed inside the top surface of the shielded shell. Wave-absorbing cones are installed on the inner side of the shielded shell. Shielded doors, waveguide windows, and signal adapter boards are installed on the sides of the shielded shell. A power supply and distribution system is installed inside the shielded shell. The power supply and distribution system is connected to the outside through a power filter. The power filter has a filtering circuit inside.

2. The radar testing anechoic chamber according to claim 1, characterized in that, The keel grid structure includes a top main beam, a top ring beam, and a top keel. The top ring beam is set along the edge of the top of the radar test anechoic chamber. Shielding steel plates are welded and laid on the keel grid structure. The grid spacing in the keel grid structure is 1m.

3. The radar testing anechoic chamber according to claim 1, characterized in that, The fire protection pipeline includes an infrared detector, a sampling tube, and a sampling head. The fire protection pipeline is arranged in a tortuous manner at the top of the radar test anechoic chamber. The infrared detector is installed on the sampling tube or around the sampling tube, and sampling heads are connected between adjacent sampling tubes.

4. The radar testing anechoic chamber according to claim 1, characterized in that, The waveguide window includes a ventilation waveguide window and a lamp heat dissipation waveguide window. The ventilation waveguide window is installed at the air inlet and air outlet of the darkroom, and the lamp heat dissipation waveguide window is installed on the combined light box. The combined light box is installed on the top surface of the darkroom.

5. The radar testing anechoic chamber according to claim 4, characterized in that, The ventilation waveguide window is welded onto a steel plate on one side of the shielding shell and includes a connecting duct flange and a duct. The duct is fixedly connected to the connecting duct flange by a crimping plate, and the window body of the ventilation waveguide window is installed inside the duct.

6. The radar testing anechoic chamber according to claim 1, characterized in that, The signal adapter board is equipped with an RF shielded adapter and a waveguide, and the signal conversion board is mounted on a steel plate on one side of the shielded housing.

7. The radar testing anechoic chamber according to claim 6, characterized in that, The radio frequency shielded adapter is an SMA dual female adapter.

8. The radar test anechoic chamber according to claim 6, characterized in that, The waveguide consists of a six-way cloverleaf waveguide and a single DN50 straight-through waveguide.

9. The radar testing anechoic chamber according to claim 6, characterized in that, The signal adapter board measures 350mm × 300mm.

10. The radar testing anechoic chamber according to claim 1, characterized in that, The filter circuit includes an input terminal and an output terminal. The input terminal is connected to one side of a first inductor, and the other side of the first inductor is connected across the two ends of a first capacitor and a second capacitor. The second capacitor is a variable capacitor. The first capacitor is connected to one side of the second inductor, and the other side of the second inductor is connected to the output terminal.

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