Wide-beam millimeter-wave radar antenna

Abstract

The utility model discloses a wide-beam millimeter-wave radar antenna, which belongs to the technical field of antennas and comprises a dielectric substrate, and a radiation patch is mounted at the front end of the dielectric substrate. The front end of the dielectric substrate is fixedly connected with a plurality of parasitic units, and the plurality of parasitic units are respectively located on the left and right sides of the radiation patch; the radiation patch is composed of a first patch, a first gap, a second patch and a second gap. Through the above mode, the parasitic unit is loaded on the H surface of the radiation patch, so that current coupling between the radiation patch and the parasitic unit can be realized, the radiation performance of the antenna is effectively optimized, and the half-power beam width in the horizontal direction is improved. Therefore, the requirement of the millimeter-wave radar for wide-beam coverage in cabin and health-care application is met, and the millimeter-wave radar antenna is simple in structure, convenient to process and low in production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to a wide-beam millimeter-wave radar antenna. Background Art

[0002] Millimeter-wave radars are increasingly used in liveness detection and trajectory tracking, especially in two main scenarios: in-cabin and indoor. The huge potential of millimeter-wave radars in the field of human life safety and health monitoring has brought more innovation and convenience to the automotive, medical, and health care fields. With the continuous advancement of technology and the promotion of its application, the role of millimeter-wave radars in human health monitoring and safety assurance will be further expanded and deepened. Most of the existing millimeter-wave in-cabin radars and health care radars use vertically polarized patch antennas. For the need to provide wide beams in the horizontal dimension in millimeter-wave in-cabin and health care radar applications, traditional vertically polarized patch antennas have the problem of narrow half-power beamwidth, which limits their coverage.

[0003] Chinese patent CN214706247U discloses a millimeter wave radar antenna, comprising: a dielectric substrate; at least one antenna array, formed by etching a portion of the surface copper foil on the dielectric substrate; a radio frequency chip, arranged on the dielectric substrate; wherein the antenna array is connected to the radio frequency chip through a feeder network; a shielding cover, fixed on another portion of the surface copper foil of the dielectric substrate, and completely covering the radio frequency chip and the bent portion of the feeder network.

[0004] However, the patent cannot broaden the half-power beamwidth of the millimeter-wave radar antenna, limiting its coverage range.

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

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

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

[0008] A wide-beam millimeter-wave radar antenna comprises a dielectric substrate;

[0009] A radiation patch is installed at the front end of the dielectric substrate;

[0010] A plurality of parasitic units are fixedly connected to the front end of the dielectric substrate, and the plurality of parasitic units are respectively located on the left and right sides of the radiation patch;

[0011] The radiation patch is composed of a first patch, a first gap, a second patch and a second gap. The second patch is fixedly connected to the center of the lower end of the first patch. The lower end of the first patch is also provided with a first gap and a second gap located on both sides of the second patch.

[0012] Furthermore, the first patch and the second patch are both fixedly connected to the dielectric substrate.

[0013] Furthermore, the length of the second patch in the up-down direction is greater than the length of the first patch in the up-down direction.

[0014] Furthermore, the first patch is in an inverted "concave" shape, and the second patch is fixedly connected to the concave part at the lower end of the first patch.

[0015] Furthermore, the upper ends of the first slit and the second slit are flush with the upper end of the second patch, and the lower ends of the first slit and the second slit pass through the edge of the first patch.

[0016] Furthermore, the first gap and the second gap are rectangular gaps, and the first gap and the second gap are the same in size.

[0017] Furthermore, the plurality of parasitic units are respectively located on the left and right sides of the first patch, and there is a gap between the plurality of parasitic units and the first patch.

[0018] Furthermore, the parasitic unit is in the shape of a rectangle or a square.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model can realize current coupling between the radiation patch and the parasitic unit by loading a parasitic unit on the H-surface of the radiation patch, effectively optimize the radiation performance of the antenna, and improve the half-power beam width in the horizontal direction, thereby meeting the needs of millimeter-wave radar for wide beam coverage in cabins and health care applications. In addition, the millimeter-wave radar antenna has a simple structure, is easy to process, and has a low production cost. 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 A schematic diagram of a wide beam millimeter wave radar antenna of the utility model Figure 1 ;

[0023] Figure 2 A schematic diagram of a wide beam millimeter wave radar antenna of the utility model Figure 2 ;

[0024] Figure 3 This is a standing wave comparison diagram of a wide-beam millimeter-wave radar antenna of the utility model;

[0025] Figure 4 This is a comparison diagram of the E-plane radiation direction of a wide-beam millimeter-wave radar antenna of the utility model;

[0026] Figure 5 This is a comparison diagram of the H-plane radiation direction of a wide-beam millimeter-wave radar antenna of the utility model.

[0027] The numbers in the figure represent:

[0028] 1. Dielectric substrate; 2. Radiating patch; 21. First patch; 22. First gap; 23. Second patch; 24. Second gap; 3. Parasitic unit. DETAILED DESCRIPTION

[0029] 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.

[0030] In the following description, the terms “left”, “right”, “front”, “back”, “up” and “down” are used to refer to Figure 2 The viewing direction is oriented.

[0031] Embodiment 1

[0032] In some embodiments, please refer to the attached instructions. Figure 1-5 , a wide-beam millimeter-wave radar antenna, comprising a dielectric substrate 1;

[0033] A radiation patch 2 is installed at the front end of the dielectric substrate 1;

[0034] A plurality of parasitic units 3 are fixedly connected to the front end of the dielectric substrate 1, and the plurality of parasitic units 3 are respectively located on the left and right sides of the radiation patch 2;

[0035] The radiation patch 2 is composed of a first patch 21, a first slit 22, a second patch 23 and a second slit 24. The second patch 23 is fixedly connected to the center of the lower end of the first patch 21. The lower end of the first patch 21 is also provided with a first slit 22 and a second slit 24 located on both sides of the second patch 23.

[0036] By loading the parasitic unit 3 on the H-surface of the radiation patch 2, current coupling between the radiation patch 2 and the parasitic unit 3 can be achieved, effectively optimizing the radiation performance of the antenna and improving the half-power beam width in the horizontal direction, thereby meeting the requirements of millimeter-wave radar for wide beam coverage in cabin and health care applications. In addition, the millimeter-wave radar antenna has a simple structure, is easy to process, and has a low production cost.

[0037] The front end in the text is the H plane of the antenna radiation patch 2, the H plane refers to the plane perpendicular to the direction of flow of the oscillating current of the antenna radiation patch 2, that is, the horizontal plane of the antenna, and the E plane refers to the vertical plane perpendicular to the direction of flow of the oscillating current of the antenna radiation patch 2, that is, the vertical plane of the antenna.

[0038] The first patch 21 and the second patch 23 are both fixedly connected to the dielectric substrate 1 .

[0039] The length of the second patch 23 in the up-down direction is greater than the length of the first patch 21 in the up-down direction.

[0040] The first patch 21 is in an inverted “concave” shape, and the second patch 23 is fixedly connected to the concave portion at the lower end of the first patch 21 .

[0041] The upper ends of the first slit 22 and the second slit 24 are flush with the upper end of the second patch 23 , and the lower ends of the first slit 22 and the second slit 24 pass through the edge of the first patch 21 .

[0042] The first gap 22 and the second gap 24 are rectangular gaps, and the first gap 22 and the second gap 24 are the same in size.

[0043] The first patch 21, the first gap 22, the second patch 23 and the second gap 24 are an integrally formed structure.

[0044] The plurality of parasitic units 3 are respectively located on the left and right sides of the first patch 21 , and there is a gap between the plurality of parasitic units 3 and the first patch 21 .

[0045] The parasitic unit 3 is in a rectangular or square shape.

[0046] Figure 3 It is a standing wave comparison diagram of the original microstrip antenna and the microstrip antenna with parasitic unit 3 added to the H-surface. The dotted line in the figure represents the return loss of the microstrip antenna with parasitic unit 3 added to the H-surface, and the solid line in the figure represents the return loss of the original microstrip antenna. The horizontal axis in the figure is the frequency, and the vertical axis is the return loss. It can be seen from the figure that the resonance point of the H-surface with parasitic unit 3 added and the resonance point of the original antenna are both at 60GHz;

[0047] Figure 4This is a comparison diagram of the E-plane radiation direction of the original microstrip antenna and the microstrip antenna with parasitic unit 3 added to the H-plane in the 60 GHz frequency band. The solid line in the figure represents the E-plane radiation pattern of the microstrip antenna with parasitic unit 3 added to the H-plane, and the dotted line in the figure represents the E-plane radiation pattern of the original microstrip antenna. The horizontal axis represents the angle of the antenna radiation direction, and the vertical axis represents the radiation power density. It can be seen from the figure that the half-power beamwidth of the E-plane of the microstrip antenna with parasitic unit 3 added to the H-plane has not deteriorated.

[0048] Figure 5 This is a comparison diagram of the H-plane radiation direction of the original microstrip antenna and the microstrip antenna with parasitic unit 3 added to the H-plane in the 60 GHz frequency band. The solid line in the figure represents the H-plane radiation pattern of the microstrip antenna with parasitic unit 3 added to the H-plane, and the dotted line in the figure represents the H-plane radiation pattern of the original microstrip antenna. The horizontal axis represents the angle of the antenna radiation direction, and the vertical axis represents the radiation power density. It can be seen from the figure that the half-power beam width on the H-plane with the parasitic unit 3 added is increased from 80° to 111°, which is approximately increased by 38.8%.

[0049] 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. A wide-beam millimeter-wave radar antenna, comprising a dielectric substrate (1), characterized in that: A radiation patch (2) is installed at the front end of the dielectric substrate (1); A plurality of parasitic units (3) are fixedly connected to the front end of the dielectric substrate (1), and the plurality of parasitic units (3) are respectively located on the left and right sides of the radiation patch (2); The radiation patch (2) is composed of a first patch (21), a first slit (22), a second patch (23) and a second slit (24); the second patch (23) is fixedly connected to the center of the lower end of the first patch (21); and the first slit (22) and the second slit (24) are also provided at the lower end of the first patch (21) and are located on both sides of the second patch (23).

2. The wide-beam millimeter-wave radar antenna according to claim 1, characterized in that: The first patch (21) and the second patch (23) are both fixedly connected to the dielectric substrate (1).

3. The wide-beam millimeter-wave radar antenna according to claim 2, characterized in that: The length of the second patch (23) in the up-down direction is greater than the length of the first patch (21) in the up-down direction.

4. The wide-beam millimeter-wave radar antenna according to claim 3, characterized in that: The first patch (21) is in an inverted "concave" shape, and the second patch (23) is fixedly connected to the concave portion at the lower end of the first patch (21).

5. The wide-beam millimeter-wave radar antenna according to claim 4, characterized in that: The upper ends of the first slit (22) and the second slit (24) are flush with the upper end of the second patch (23), and the lower ends of the first slit (22) and the second slit (24) pass through the edge of the first patch (21).

6. The wide-beam millimeter-wave radar antenna according to claim 5, characterized in that: The first gap (22) and the second gap (24) are rectangular gaps, and the first gap (22) and the second gap (24) are the same size.

7. The wide-beam millimeter-wave radar antenna according to claim 6, characterized in that: The plurality of parasitic units (3) are respectively located on the left and right sides of the first patch (21), and there is a gap between the first patch (21).

8. The wide-beam millimeter-wave radar antenna according to claim 7, characterized in that: The parasitic unit (3) is in the shape of a rectangle or a square.

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