Millimeter wave radar antenna protective cover and radar equipment

Abstract

The utility model discloses a millimeter wave radar antenna protective cover and radar equipment, which comprises a detachable hollow shell and a wave absorbing material arranged in the shell, and a millimeter wave radar antenna is arranged in the shell; the detachable shell comprises a rear shell with an opening in one end and a front cover plate which is detachably installed at the opening and forms a closed cavity with the rear shell. The front cover plate is made of a wave-transparent material, so that absorption of transmission electromagnetic waves is reduced, and interference to transmission signal phases is prevented; the rear shell is made of metal materials or composite materials and provides high-strength support for the whole structure. The radar antenna and the radar shell are connected through a non-metal material spring, vibration can be reduced while supporting is provided, and the influence of vibration of various forms such as wind vibration and ground vibration on target detection is reduced; the inner side of the rear shell is covered with a wave-absorbing material adaptive to the working frequency band of the radar so as to absorb the incident angle ultralimit and clutters scattered by the circuit board and the shell, and the millimeter wave radar is prevented from receiving target signals not in the detection range and being interfered by the scattered clutters in the cavity.

Description

Technical Field

[0001] This utility model belongs to the field of radar technology, specifically a millimeter-wave radar antenna protective cover and radar equipment. Background Technology

[0002] Millimeter-wave radar is a widely used target detection sensor, used in fields such as intelligent transportation and driver assistance to measure targets such as vehicles and pedestrians. Millimeter-wave radar has advantages such as long detection range, minimal weather-related influences, and all-weather operation. However, millimeter-wave electromagnetic waves are sensitive to metallic materials; the electromagnetic waves scattered by a small aluminum can might be identified as a large vehicle by a millimeter-wave radar. With the widespread use of automotive millimeter-wave radar, the number of such radars on the road is increasing, making them more susceptible to clutter interference, especially from other nearby millimeter-wave radars or metallic objects. Furthermore, millimeter-wave radars installed on vehicles and roadside equipment can vibrate with their bases, causing the phase of the transmitted and received signals from the radar antenna to deviate from expectations, resulting in inaccurate or even erroneous target information. Therefore, it is necessary to propose a protective cover for millimeter-wave radar antennas to improve the radar's resistance to electromagnetic and vibration interference from a hardware perspective. Utility Model Content

[0003] The purpose of this invention is to provide a millimeter-wave radar antenna protective cover to address the problems existing in the prior art.

[0004] The technical solution to achieve the purpose of this utility model is as follows: On the one hand, a millimeter-wave radar antenna protective cover is provided. The protective cover includes a detachable hollow shell, a wave-absorbing material disposed in the shell, and a millimeter-wave radar antenna installed in the shell. The detachable shell includes a rear shell with an opening at one end, and a front cover plate detachably installed at the opening and forming a closed cavity with the rear shell. The dimensions of the rear shell, the thickness of the wave-absorbing material, the installation position of the millimeter-wave radar antenna, and the field of view range of the millimeter-wave radar antenna should satisfy the following relationship:

[0005]

[0006]

[0007] In the formula, The thickness of the absorbing material, The distance between the millimeter-wave radar antenna mounting position and the front cover. The inner diameter of the radar antenna radome. To determine the field of view range of the designed radar antenna, Let c be a positive integer, and c be the speed of light in air. This is the center frequency of the millimeter-wave radar antenna.

[0008] Furthermore, the millimeter-wave radar antenna is mounted in the housing by a set of springs.

[0009] Furthermore, the set of springs includes multiple springs distributed around the millimeter-wave radar antenna to achieve multi-directional fixation of the millimeter-wave radar antenna.

[0010] Furthermore, the spring is made of a non-metallic material.

[0011] Furthermore, the front cover is made of a wave-transparent material with a thickness of 1 or 1.5 times the wavelength of the radar transmission signal.

[0012] Furthermore, the rear shell is made of metal or composite material.

[0013] Furthermore, the absorbing material covers the inner wall of the rear shell.

[0014] On the other hand, a radar device is provided, including millimeter-wave radar circuitry and a housing, the device further including the millimeter-wave radar antenna protective cover.

[0015] Compared with the prior art, the significant advantages of this utility model are:

[0016] (1) The radar antenna and the radar housing are connected by a spring, which can effectively avoid the target detection effect from deteriorating when the antenna shakes due to wind vibration, ground vibration, etc.

[0017] (2) Absorbing materials are used on the side of the radar to absorb the clutter caused by the incident angle exceeding the limit and the circuit board and housing scattering, so as to prevent the millimeter-wave radar from being interfered with by other radars and clutter outside the target detection range.

[0018] (3) The relationship between the size of the back shell, the thickness of the absorbing material, the installation position of the millimeter-wave radar antenna and the field of view of the millimeter-wave radar antenna was constrained, which can significantly improve the anti-electromagnetic and vibration interference capability of the millimeter-wave radar.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a millimeter-wave radar antenna protective cover in one embodiment, wherein... Figure 1 Image (a) is a side view of the protective radome for a millimeter-wave radar antenna. Figure 1 (b) is a top view of the millimeter-wave radar antenna radome.

[0021] Figure 2 This is a schematic diagram showing interference from clutter outside the target detection range when there is no absorbing material.

[0022] Figure 3This is a schematic diagram showing the interference from clutter inside the enclosure when there is no absorbing material. Figure 3 (a) shows the case of clutter interference reflected from the bottom of the rear shell. Figure 3 (b) in the diagram represents the case of clutter interference reflected from the rear shell side. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] It should be noted that if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] In one embodiment, combined Figure 1 A millimeter-wave radar antenna protective cover is provided. The protective cover includes a detachable hollow shell, a radar-absorbing material (compatible with the radar operating frequency band) disposed within the shell, and a millimeter-wave radar antenna mounted in the shell. The detachable shell includes a rear shell 2 with an opening at one end, and a front cover plate 1 detachably mounted at the opening and forming a closed cavity with the rear shell 2. The dimensions of the rear shell 2, the thickness of the radar-absorbing material 3, the mounting position of the millimeter-wave radar antenna 6, and the field of view range of the millimeter-wave radar antenna should satisfy the following relationship:

[0026]

[0027]

[0028] In the formula, The thickness of the absorbing material, The distance between the millimeter-wave radar antenna mounting position and the front cover. The inner diameter of the radar antenna radome. To determine the field of view range of the designed radar antenna, Let c be a positive integer, and c be the speed of light in air. This is the center frequency of the millimeter-wave radar antenna.

[0029] Preferably, in some embodiments, the millimeter-wave radar antenna is mounted in the housing by a set of springs 4.

[0030] Preferably, in some embodiments, the set of springs includes multiple springs distributed around the millimeter-wave radar antenna to achieve multi-directional fixation of the millimeter-wave radar antenna. The radar antenna is fixed within the housing from multiple directions, including top, bottom, left, right, and rear, and the elasticity of the springs reduces antenna jitter when the base vibrates, thereby reducing the impact of vibration on target detection.

[0031] Preferably, in some embodiments, the spring is made of a non-metallic material.

[0032] Preferably, in some embodiments, the front cover is made of a radar-transparent material with a thickness of 1 or 1.5 times the wavelength of the radar transmitted signal.

[0033] Preferably, in some embodiments, the rear shell is made of metal or composite material, which has high strength to provide support for the overall structure.

[0034] Preferably, in some embodiments, the absorbing material covers the inner wall of the rear shell.

[0035] Preferably, in some embodiments, the front cover is fixedly connected to the rear shell by, but not limited to, bolts.

[0036] Without absorbing material on the side of the rear housing, target signals outside the detection range will radiate onto the receiving antenna, interfering with the target detection results. Figure 2 As shown. Furthermore, clutter scattered from the sides and bottom can also radiate onto the receiving antenna, interfering with target detection results, such as... Figure 3 As shown. By covering the sides and bottom of the rear housing with wave-absorbing material, Figure 2 and Figure 3 Interference signals can be effectively isolated or absorbed.

[0037] In one embodiment, a radar device is provided, including millimeter-wave radar circuitry and a housing, the device further including a protective cover for the millimeter-wave radar antenna.

[0038] For specific limitations, please refer to the limitations on millimeter-wave radar antenna shields mentioned above, which will not be repeated here.

[0039] It should be noted that for components without special structural limitations, any component that can achieve the corresponding function in the existing technology is acceptable.

[0040] It should also be noted that the above-mentioned settings, installations, connections, and fixations can be made using, but are not limited to, bolts, threads, etc. Any existing fixed or movable connection scheme can be adapted, as long as the corresponding function can be achieved.

[0041] 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. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model without departing from its spirit and scope should be included within the protection scope of this utility model.

Claims

1. A millimeter-wave radar antenna protective cover, characterized in that, The protective cover includes a detachable hollow shell, a wave-absorbing material disposed within the shell, and a millimeter-wave radar antenna mounted within the shell. The detachable shell includes a rear shell open at one end and a front cover plate detachably mounted at the opening and forming a closed cavity with the rear shell. The dimensions of the rear shell, the thickness of the wave-absorbing material, the mounting position of the millimeter-wave radar antenna, and the field of view range of the millimeter-wave radar antenna should satisfy the following relationships: In the formula, T a T represents the thickness of the absorbing material. b T represents the distance between the millimeter-wave radar antenna mounting position and the front cover. c θ is the inner diameter of the radar antenna radome, θ is the designed radar antenna field of view, n is a positive integer, c is the speed of light in air, and f is the center frequency of the millimeter-wave radar antenna.

2. The millimeter-wave radar antenna protective cover according to claim 1, characterized in that, The millimeter-wave radar antenna is mounted in the housing by a set of springs.

3. The millimeter-wave radar antenna protective cover according to claim 2, characterized in that, The set of springs includes multiple springs distributed around the millimeter-wave radar antenna to achieve multi-directional fixation of the millimeter-wave radar antenna.

4. The millimeter-wave radar antenna protective cover according to claim 2, characterized in that, The spring is made of non-metallic material.

5. The millimeter-wave radar antenna protective cover according to claim 1, characterized in that, The front cover is made of a wave-transparent material with a thickness of 1 or 1.5 times the wavelength of the radar transmission signal.

6. The millimeter-wave radar antenna protective cover according to claim 1, characterized in that, The rear shell is made of metal or composite material.

7. The millimeter-wave radar antenna protective cover according to claim 1, characterized in that, The microwave-absorbing material covers the inner wall of the rear shell.

8. A radar device, comprising millimeter-wave radar circuitry and a housing, characterized in that, The device also includes a millimeter-wave radar antenna shield as described in any one of claims 1 to 7.

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