Millimeter wave radar antenna

Abstract

The utility model provides a millimeter wave radar antenna. The millimeter wave radar antenna comprises a dielectric substrate; the plurality of radiation units are arranged above the dielectric substrate, the radiation units are coupled with the central feeder line and are alternately distributed left and right along the central feeder line, and one end of the radiation patch of each radiation unit is loaded with at least one grounding via hole; and the metal ground is arranged below the dielectric substrate. According to the millimeter wave radar antenna provided by the utility model, the wide wave beam is synthesized in the space through the two reverse alternating radiation units, so that the whole array antenna realizes the wide wave beam, and the HPBW of the horizontal wave beam of the ultra-wide wave beam low-sidelobe array antenna of the millimeter wave radar antenna is 160 degrees; compared with a traditional millimeter-wave radar antenna, the millimeter-wave radar antenna provided by the invention is simple in structure and easy to process, and has a good industrial prospect.

Description

Technical Field

[0001] The present application relates to the field of radar detection technology, and in particular to a millimeter wave radar antenna. Background Art

[0002] Millimeter-wave radar antennas have been widely used in fields such as autonomous driving and intelligent transportation systems, security and monitoring systems, drones and robotics. However, in many scenarios, radars need to have a wider detection angle, which means that antennas need to have a wider beam width. Utility Model Content

[0003] The present application provides a millimeter-wave radar antenna to solve the problem of narrow antenna beam width in the prior art.

[0004] The present application provides a millimeter wave radar antenna, comprising:

[0005] dielectric substrate;

[0006] A plurality of radiating units are provided above the dielectric substrate, the radiating units are coupled to the central feed line and are alternately distributed left and right along the central feed line, and one end of the radiating patch of each radiating unit is loaded with at least one ground via;

[0007] The metal ground is arranged below the dielectric substrate.

[0008] Preferably, the radiation unit comprises a rectangular metal patch.

[0009] Preferably, the H-surface of the radiation patch of the radiation unit is loaded with at least one ground via.

[0010] Preferably, the grounding via is provided along an edge of the radiation unit, passes through the dielectric substrate and is connected to the metal ground.

[0011] Preferably, the dimension W of the radiation unit along the center feeder line is between 1 / 2λ g with 4 / 5λ g Between; the dimension L along the direction perpendicular to the center feed line is 1 / 4λ g , where λ g is the wavelength of the dielectric substrate at the operating frequency of the millimeter wave radar antenna.

[0012] Preferably, the number of the radiation units is an even number, and the intervals between the radiation units are equal.

[0013] Preferably, the spacing between the radiation units is 1 / 2λ g .

[0014] Preferably, an impedance converter is provided between the central feeder and each of the radiation units, and the impedance converter is used to perform impedance matching on the multiple radiation units.

[0015] Preferably, the HPBW of the horizontal beam of the ultra-wide beam low sidelobe array antenna of the millimeter wave radar antenna is 160°.

[0016] Preferably, the dielectric substrate is Rogers 3003G2, with a thickness of 5 mil, a dielectric constant of 3.07, and a loss tangent of 0.0013.

[0017] The millimeter wave radar antenna provided in this application has the following beneficial effects:

[0018] 1. A wide beam is synthesized in space by two reverse-direction alternating radiating units, thereby enabling the entire array antenna to achieve a wide beam. The HPBW of the horizontal beam of the ultra-wide beam low sidelobe array antenna of the millimeter-wave radar antenna is 160°.

[0019] 2. Compared with traditional millimeter-wave radar antennas, the millimeter-wave radar antenna provided in this application has a simple structure, is easy to process, and has good industrial prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 is a side view of the millimeter wave radar antenna provided in an embodiment of the present application;

[0022] Figure 2 is a top view of a radiation unit of a millimeter-wave radar antenna provided in an embodiment of the present application;

[0023] Figure 3 1 is a schematic diagram of a partial structure of a radiating unit of a millimeter-wave radar antenna provided in an embodiment of the present application;

[0024] Figure 4 This is a top view of a conventional array antenna;

[0025] Figure 5 The millimeter wave radar antenna provided in the embodiment of the present application is Figure 4 Comparison of the normalized patterns of the shown antennas. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0027] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments described herein can be practiced in an order other than that shown or described herein.

[0028] like Figure 1-3 As shown, a millimeter wave radar antenna includes:

[0029] Dielectric substrate 1;

[0030] A plurality of radiating units 2 are provided above the dielectric substrate 1 and are used to emit electromagnetic wave energy. The radiating units 2 are coupled with the central feed line 4 and are alternately distributed left and right along the central feed line 4. One end of the radiating patch of each radiating unit 2 is loaded with at least one ground via;

[0031] The metal ground 3 is provided below the dielectric substrate 1 and is used to support the antenna body and provide a ground signal.

[0032] The millimeter-wave radar antenna provided in the embodiment of the present application synthesizes a wide beam in space through two reverse-alternating radiating units, thereby enabling the entire array antenna to achieve a wide beam.

[0033] Preferably, the radiation unit 2 comprises a rectangular metal patch, which has high strength, good stability, excellent thermal conductivity, good electromagnetic shielding effect, and is easy to maintain.

[0034] Preferably, the H-surface of the radiation patch of the radiation unit 2 is loaded with at least one ground via 21. Loading at least one ground via on the H-surface of the radiation patch can change the direction of the current and synthesize a wide beam in space.

[0035] Preferably, the ground via 21 is provided along the edge of the radiation unit 2 , passes through the dielectric substrate 1 and is connected to the metal ground 3 .

[0036] Preferably, the dimension W of the radiation unit 2 along the center feeder direction is between 1 / 2λ g with 4 / 5λ g Between; the dimension L along the direction perpendicular to the center feed line is 1 / 4λ g, where λ g is the wavelength of the dielectric substrate 1 at the operating frequency of the millimeter-wave radar antenna, and is calculated as follows:

[0037]

[0038] Preferably, the number of the radiating elements 2 is an even number, and the spacing between the radiating elements 2 is equal. An even number of radiating elements 2 and an equidistant layout can provide better interference suppression, power distribution balance, flexible control, and system fault resistance, thereby enhancing the performance and reliability of the communication system.

[0039] Preferably, the spacing between the radiation units 2 is 1 / 2λ g .

[0040] Preferably, an impedance transformer 5 is provided between the central feeder 4 and each of the radiating elements 2, and the impedance transformer is used to perform impedance matching on the multiple radiating elements 2. Using an impedance transformer to perform impedance matching between the central feeder and the radiating elements can maximize power transmission, improve signal transmission reliability, and achieve uniform signal distribution. These advantages help improve the performance and reliability of the communication system.

[0041] Preferably, the HPBW of the horizontal beam of the ultra-wide beam low sidelobe array antenna of the millimeter wave radar antenna is 160°.

[0042] Preferably, the dielectric substrate 1 is Rogers 3003G2, with a thickness of 5 mils, a dielectric constant of 3.07, and a loss tangent of 0.0013. Rogers 3003G2 has a relatively low dielectric constant and a low loss angle, ensuring minimal signal loss and dispersion, enabling efficient transmission of high-frequency signals. It also has high thermal conductivity, which helps dissipate heat from the circuit, preventing overheating and ensuring reliable performance.

[0043] Figure 4 It is a schematic diagram of the structure of a conventional array antenna; Figure 5 The millimeter wave radar antenna provided in the embodiment of the present application is Figure 4 The HPBW of the horizontal beam of the ultra-wide beam low sidelobe array antenna of the millimeter wave radar antenna provided in the embodiment of the present application is 160 degrees, while the HPBW of the horizontal beam of the conventional array antenna is only 83 degrees.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A millimeter wave radar antenna, characterized in that: include: a dielectric substrate (1); A plurality of radiation units (2) are arranged above the dielectric substrate (1), the radiation units (2) are coupled with a central feed line (4) and are alternately distributed left and right along the central feed line (4), and at least one ground via is loaded on one end of a radiation patch of each radiation unit (2); The metal ground (3) is arranged below the dielectric substrate (1).

2. The millimeter wave radar antenna according to claim 1, characterized in that The radiation unit (2) comprises a rectangular metal patch.

3. The millimeter wave radar antenna according to claim 2, characterized in that The H-surface of the radiation patch of the radiation unit (2) is loaded with at least one grounding via (21).

4. The millimeter wave radar antenna according to claim 2, characterized in that The grounding via (21) is provided along the edge of the radiation unit (2), passes through the dielectric substrate (1), and is connected to the metal ground (3).

5. The millimeter wave radar antenna according to claim 2, characterized in that: The dimension W of the radiation unit (2) along the center feeder line is between 1 / 2λ g with 4 / 5λ g Between; the dimension L along the direction perpendicular to the center feed line is 1 / 4λ g , where λ g is the wavelength of the dielectric substrate (1) at the operating frequency of the millimeter wave radar antenna.

6. The millimeter wave radar antenna according to claim 1, characterized in that The number of the radiation units (2) is an even number, and the intervals between the radiation units (2) are equal.

7. The millimeter wave radar antenna according to claim 5, characterized in that: The spacing between the radiation units (2) is 1 / 2λ g .

8. The millimeter wave radar antenna according to claim 1, characterized in that: An impedance converter (5) is provided between the central feeder (4) and each of the radiation units (2), and the impedance converter is used to perform impedance matching on the plurality of radiation units (2).

9. The millimeter wave radar antenna according to claim 1, characterized in that: The HPBW of the horizontal beam of the ultra-wide beam low sidelobe array antenna of the millimeter wave radar antenna is 160°.

10. The millimeter wave radar antenna according to claim 1, characterized in that: The dielectric substrate (1) is Rogers 3003G2, with a thickness of 5 mil, a dielectric constant of 3.07, and a loss tangent of 0.0013.

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