Ultra-wide beam antenna for millimeter wave radar

Abstract

The utility model discloses an ultra-wide wave beam antenna for a millimeter wave radar, which belongs to the technical field of base station antennas and comprises a bottom plate, and the upper end of the bottom plate is connected with the lower end of an antenna unit; the antenna unit comprises a connecting assembly, a radiating unit and a grounding assembly, one side of the radiating unit is connected with the outer side of the connecting assembly, the lower ends of the connecting assembly and the radiating unit are connected with the upper end of the bottom plate, and the outer side of the grounding assembly is connected with the radiating unit and the bottom plate. According to the above mode, through the arrangement of the grounding assembly on the radiation unit, the two units which feed alternately in opposite directions are enabled to synthesize a wide wave beam in space, and the directivity of the antenna is improved; through the simple structure of the base plate and the antenna unit, the use of the antenna in a compact layout is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of base station antennas, and in particular to an antenna with an ultra-wide beam used for millimeter wave radars. Background Art

[0002] Currently, the autonomous driving and V2X markets are very hot, and solutions using millimeter-wave radar, lidar, and cameras as sensors are also the current mainstream solutions. Among them, millimeter-wave radar, as a sensor suitable for all-weather environments, is particularly important in the field of autonomous driving.

[0003] For example, Chinese patent application CN105190998A discloses an array antenna comprising a first metal layer, a first dielectric layer, a second metal layer, a second dielectric layer and a third metal layer stacked in sequence, the second dielectric layer is provided with a plurality of metal through holes, the plurality of metal through holes form a feeding area, the first metal layer comprises a plurality of sub-arrays, each sub-array comprises a plurality of radiating arrays and a power divider, the power divider comprises a central area and a plurality of branches extending from the central area, the radiating arrays are respectively connected to one end of the plurality of branches away from the central area, the second metal layer is provided with a plurality of coupling slots, the plurality of coupling slots are respectively opposite to the central area, the feeding area is used to feed in signals, the signals are transmitted to the central area of ​​the power divider through the plurality of coupling slots, and then the signals are transmitted to the radiating arrays through the plurality of branches.

[0004] However, the array antenna has a small detection angle, limited bandwidth expansion performance, and the entire device occupies a large area, which is not suitable when the millimeter-wave radar antenna is compactly laid out.

[0005] Based on this, the utility model designs an ultra-wide beam antenna for millimeter wave radar to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides an antenna with an ultra-wide beam for millimeter-wave radar.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] An ultra-wide beam antenna for millimeter wave radar, comprising a base plate,

[0009] The upper end of the bottom plate is connected to the lower end of the antenna unit;

[0010] The antenna unit includes a connecting component, a radiating unit and a grounding component, one side of the radiating unit is connected to the outer side of the connecting component, the lower ends of the connecting component and the radiating unit are connected to the upper end of the base plate, and the outer side of the grounding component is connected to the radiating unit and the base plate.

[0011] Furthermore, the bottom plate includes a dielectric substrate, an upper metal plate and a lower metal plate, the lower end of the dielectric substrate is fixedly connected to the upper end of the lower metal plate, the upper end of the dielectric substrate is fixedly connected to the lower end of the upper metal plate, the upper end of the upper metal plate is connected to the lower end of the connecting component and the radiation unit, and the inner sides of the dielectric substrate, the upper metal plate and the lower metal plate are connected to the outer side of the grounding component.

[0012] Furthermore, the dielectric substrate is a ceramic-filled high-frequency polytetrafluoroethylene laminate, which is a prior art.

[0013] Furthermore, the connecting component is a long strip connecting plate, and the lower end of the connecting component is fixedly connected to the upper end of the upper metal plate.

[0014] Furthermore, the radiation units are provided in plurality, the number of the radiation units is set to an even number, and the plurality of radiation units are alternately arranged on the left and right sides of the connection component in opposite directions.

[0015] Furthermore, the radiation unit includes a radiation base plate and a radiation patch, the inner side of the radiation base plate is fixedly connected to the outer side of the connecting component, the lower end of the radiation base plate is fixedly connected to the upper end of the upper metal plate, the upper end of the radiation base plate is fixedly connected to the lower end of the radiation patch, and the radiation base plate and the radiation patch are internally connected to the outer side of the grounding component.

[0016] Furthermore, there are multiple grounding components, and every three grounding components are arranged in sequence from front to back inside a radiation base plate and a radiation patch. The grounding components include grounding vias and a protective film. The protective film passes through the radiation patch, the radiation base plate, the upper metal plate, the dielectric substrate and the lower metal plate. The outer side of the protective film is fixedly connected to the radiation patch, the radiation base plate, the upper metal plate, the dielectric substrate and the lower metal plate. A grounding via is opened in the middle of the protective film.

[0017] Furthermore, the protective film is an organic solderability protective layer, which is a prior art.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model arranges a grounding component on the radiation unit so that two units fed alternately in opposite directions synthesize a wide beam in space, thereby improving the directivity of the antenna.

[0020] The utility model realizes the use of the antenna in a compact layout through the simple structure of the bottom plate and the antenna unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 The utility model is a three-dimensional antenna for ultra-wide beam of millimeter wave radar Figure 1 ;

[0023] Figure 2 This is a front view of an ultra-wide beam antenna for millimeter wave radar of the utility model;

[0024] Figure 3 This is a top view of an ultra-wide beam antenna for millimeter wave radar according to the utility model;

[0025] Figure 4 The utility model is a three-dimensional antenna for ultra-wide beam of millimeter wave radar Figure 2 ;

[0026] Figure 5 For along Figure 3 AA direction cross-sectional view;

[0027] Figure 6 for Figure 5 The enlarged view of point B in the middle;

[0028] Figure 7 This is a comparison diagram of scattering parameters between the utility model and conventional microstrip array antennas;

[0029] Figure 8 This is a comparison diagram of the horizontal radiation direction of the utility model and the conventional microstrip array antenna;

[0030] Fig. 9 This is a comparison diagram of the elevation radiation direction of the utility model and the conventional microstrip array antenna.

[0031] The numbers in the figure represent:

[0032] 1. Bottom plate 11. Dielectric substrate 12. Upper metal plate 13. Lower metal plate 2. Antenna unit 21. Connecting component 22. Radiating unit 221. Radiating bottom plate 222. Radiating patch 23. Grounding component 231. Grounding via 232. Protective film. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0035] Embodiment 1

[0036] In some embodiments, please refer to the attached instructions. Figure 1-9 , an ultra-wide beam antenna for millimeter wave radar, comprising a base plate 1,

[0037] The upper end of the bottom plate 1 is connected to the lower end of the antenna unit 2;

[0038] The antenna unit 2 includes a connecting component 21, a radiating unit 22 and a grounding component 23. One side of the radiating unit 22 is connected to the outer side of the connecting component 21, the lower ends of the connecting component 21 and the radiating unit 22 are connected to the upper end of the base plate 1, and the outer side of the grounding component 23 is connected to the radiating unit 22 and the base plate 1.

[0039] The bottom plate 1 includes a dielectric substrate 11, an upper metal plate 12 and a lower metal plate 13. The lower end of the dielectric substrate 11 is fixedly connected to the upper end of the lower metal plate 13, the upper end of the dielectric substrate 11 is fixedly connected to the lower end of the upper metal plate 12, the upper end of the upper metal plate 12 is connected to the lower ends of the connecting component 21 and the radiation unit 22, and the inner sides of the dielectric substrate 11, the upper metal plate 12 and the lower metal plate 13 are connected to the outer side of the grounding component 23.

[0040] The dielectric substrate 11 is a ceramic-filled high-frequency polytetrafluoroethylene laminate, which is a prior art.

[0041] The connecting component 21 is a long strip connecting plate, and the lower end of the connecting component 21 is fixedly connected to the upper end of the upper metal plate 12 .

[0042] There are multiple radiation units 22 , the number of which is an even number, and the multiple radiation units 22 are alternately arranged on the left and right sides of the connecting component 21 in opposite directions.

[0043] The radiation unit 22 includes a radiation base plate 221 and a radiation patch 222. The inner side of the radiation base plate 221 is fixedly connected to the outer side of the connection component 21, the lower end of the radiation base plate 221 is fixedly connected to the upper end of the upper metal plate 12, the upper end of the radiation base plate 221 is fixedly connected to the lower end of the radiation patch 222, and the radiation base plate 221 and the radiation patch 222 are internally connected to the outer side of the grounding component 23.

[0044] There are multiple grounding components 23, and every three grounding components 23 are sequentially arranged inside a radiation base plate 221 and a radiation patch 222 from front to back. The grounding component 23 includes a grounding via 231 and a protective film 232. The protective film 232 passes through the radiation patch 222, the radiation base plate 221, the upper metal plate 12, the dielectric substrate 11 and the lower metal plate 13. The outer side of the protective film 232 is fixedly connected to the inside of the radiation patch 222, the radiation base plate 221, the upper metal plate 12, the dielectric substrate 11 and the lower metal plate 13, and a grounding via 231 is opened in the middle of the protective film 232.

[0045] The protective film 232 is an organic solderability protective layer, which is a prior art.

[0046] When the ultra-wide beam antenna for millimeter-wave radar is in normal use, the dielectric substrate 11 is a high-frequency plate suitable for millimeter-wave automobile radar antennas, which improves the use effect of the millimeter-wave radar. Two adjacent reverse radiation patches 222 are alternately excited by loading the ground via 231, and a wide beam is synthesized in space through two reverse alternately fed units, so that the entire array antenna realizes a wide beam. The protective film 232 can protect the radiation base plate 221 and the inside of the radiation patch 222 from oxidation.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-wide beam antenna for millimeter wave radar, comprising a base plate (1), characterized in that: The upper end of the bottom plate (1) is connected to the lower end of the antenna unit (2); The antenna unit (2) comprises a connecting component (21), a radiating unit (22) and a grounding component (23); one side of the radiating unit (22) is connected to the outside of the connecting component (21); the lower ends of the connecting component (21) and the radiating unit (22) are connected to the upper end of the base plate (1); and the outer side of the grounding component (23) is connected to the radiating unit (22) and the base plate (1).

2. The ultra-wide beam antenna for millimeter wave radar according to claim 1, characterized in that: The bottom plate (1) comprises a dielectric substrate (11), an upper metal plate (12) and a lower metal plate (13); the lower end of the dielectric substrate (11) is fixedly connected to the upper end of the lower metal plate (13); the upper end of the dielectric substrate (11) is fixedly connected to the lower end of the upper metal plate (12); the upper end of the upper metal plate (12) is connected to the lower ends of the connecting component (21) and the radiation unit (22); and the inner sides of the dielectric substrate (11), the upper metal plate (12) and the lower metal plate (13) are connected to the outer side of the grounding component (23).

3. The ultra-wide beam antenna for millimeter wave radar according to claim 2, characterized in that: The dielectric substrate (11) is a high-frequency polytetrafluoroethylene laminate filled with ceramics.

4. The ultra-wide beam antenna for millimeter wave radar according to claim 2 or 3, characterized in that: The connecting component (21) is a long strip-shaped connecting plate, and the lower end of the connecting component (21) is fixedly connected to the upper end of the upper metal plate (12).

5. The ultra-wide beam antenna for millimeter wave radar according to claim 4, characterized in that: A plurality of the radiation units (22) are provided, the number of the radiation units (22) is set to an even number, and the plurality of radiation units (22) are arranged alternately on the left and right sides of the connection component (21) in opposite directions.

6. The ultra-wide beam antenna for millimeter wave radar according to claim 5, characterized in that: The radiation unit (22) comprises a radiation base plate (221) and a radiation patch (222); the inner side of the radiation base plate (221) is fixedly connected to the outer side of the connection component (21); the lower end of the radiation base plate (221) is fixedly connected to the upper end of the upper metal plate (12); the upper end of the radiation base plate (221) is fixedly connected to the lower end of the radiation patch (222); and the inside of the radiation base plate (221) and the radiation patch (222) are connected to the outer side of the grounding component (23).

7. The ultra-wide beam antenna for millimeter wave radar according to claim 6, characterized in that: A plurality of grounding components (23) are provided, and every three grounding components (23) are sequentially provided inside a radiation base plate (221) and a radiation patch (222) from front to back. The grounding component (23) comprises a grounding via (231) and a protective film (232). The protective film (232) passes through the radiation patch (222), the radiation base plate (221), the upper metal plate (12), the dielectric substrate (11) and the lower metal plate (13). The outer side of the protective film (232) is fixedly connected to the inside of the radiation patch (222), the radiation base plate (221), the upper metal plate (12), the dielectric substrate (11) and the lower metal plate (13). A grounding via (231) is provided in the middle of the protective film (232).

8. The ultra-wide beam antenna for millimeter wave radar according to claim 7, characterized in that: The protective film (232) is an organic solderability protective layer.

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