阅读说明：本技术 天线系统及车载毫米波雷达 (Antenna system and vehicle-mounted millimeter wave radar ) 是由 汲壮 于 2021-07-23 设计创作，主要内容包括：本发明实施例涉及天线技术领域,公开了一种天线系统及车载毫米波雷达。该系统包括天线阵列以及所述天线阵列的第一接地层和第二接地层,所述天线阵列用于向自由空间辐射电磁波,所述第一接地层所在的第一PCB面上间隔设置有多个金属贴片,所述金属贴片用于调节所述电磁波经反射后形成的反射电磁波的相位。通过上述方式,本发明实施例提升了天线系统的大角度感知能力。(The embodiment of the invention relates to the technical field of antennas, and discloses an antenna system and a vehicle-mounted millimeter wave radar. The system comprises an antenna array, a first grounding layer and a second grounding layer of the antenna array, wherein the antenna array is used for radiating electromagnetic waves to a free space, a plurality of metal patches are arranged on a first PCB surface where the first grounding layer is located at intervals, and the metal patches are used for adjusting the phase of reflected electromagnetic waves formed after the electromagnetic waves are reflected. Through the mode, the embodiment of the invention improves the large-angle sensing capability of the antenna system.)

1. An antenna system is characterized by comprising an antenna array, a first grounding layer and a second grounding layer of the antenna array, wherein the antenna array is used for radiating electromagnetic waves to a free space, a plurality of metal patches are arranged on a first PCB surface where the first grounding layer is located at intervals, and the metal patches are used for adjusting the phase of reflected electromagnetic waves formed after the electromagnetic waves are reflected.

2. The antenna system of claim 1, wherein the metal patch is square and has a side length of a quarter of a waveguide wavelength.

3. The antenna system of claim 1 or 2, wherein the lateral spacing and the longitudinal spacing between adjacent metal patches are each one-half of a waveguide wavelength.

4. The antenna system of claim 1, wherein the antenna array is located on a second PCB surface, the second ground plane is located on a third PCB surface, a first dielectric layer is disposed between the first PCB surface and the second PCB surface, and a second dielectric layer is disposed between the first PCB surface and the third PCB surface.

5. The antenna system of claim 4, wherein the first ground plane is located directly below the antenna array, and the metal patches are distributed on left and right sides of the first ground plane.

6. The antenna system of claim 4 or 5, wherein the metal patch is uniformly spread over the area of the first PCB surface except for the first ground plane.

7. The antenna system of claim 4, wherein the second ground plane evenly spreads across the third PCB surface.

8. The antenna system of claim 1, wherein the metal patch is circular and has a diameter of a quarter waveguide wavelength.

9. The antenna system of claim 1, wherein a width of the antenna array is less than a width of the first ground plane.

10. An in-vehicle millimeter-wave radar characterized in that it comprises an antenna system according to any one of claims 1 to 9.

Technical Field

The embodiment of the invention relates to the technical field of antennas, in particular to an antenna system and a vehicle-mounted millimeter wave radar.

Background

With the continuous development of intelligent driving technology, vehicle-mounted millimeter wave radars are widely applied. The vehicle-mounted millimeter wave radar is a detection radar operating in a millimeter wave band, and detects obstacles around a vehicle through an antenna system.

In the related art, an antenna system of the millimeter wave radar generally includes an antenna array and a metal ground, and the antenna array can radiate a high-frequency radar signal to a free space. However, the inventors found in the course of implementing embodiments of the present invention that: the high-frequency radar signal radiated by the antenna array can generate a reflected radar signal after passing through the metal ground, and the reflected radar signal and the high-frequency radar signal radiated by the antenna array can be offset, so that a radiation pattern of the antenna array generates pits in a large-angle direction, and the large-angle sensing capability of the antenna system is poor.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide an antenna system and a vehicle-mounted millimeter wave radar, so as to solve the problem in the prior art that the antenna system has poor large-angle sensing capability.

According to an aspect of the embodiments of the present invention, an antenna system is provided, where the antenna system includes an antenna array, and a first ground layer and a second ground layer of the antenna array, where the antenna array is configured to radiate an electromagnetic wave to a free space, and a plurality of metal patches are disposed on a first PCB surface where the first ground layer is located at intervals, and the metal patches are configured to adjust a phase of a reflected electromagnetic wave formed after the electromagnetic wave is reflected.

In an alternative, the metal patch is square, and the side length of the metal patch is a quarter of the waveguide wavelength.

In an alternative mode, the transverse spacing and the longitudinal spacing between adjacent metal patches are both half of a waveguide wavelength.

In an optional manner, the antenna array is located on a second PCB, the second ground plane is located on a third PCB, a first dielectric layer is disposed between the first PCB and the second PCB, and a second dielectric layer is disposed between the first PCB and the third PCB.

In an optional manner, the first ground plane is located right below the antenna array, and the metal patches are distributed on left and right sides of the first ground plane.

In an alternative mode, the metal patch is uniformly spread on the area of the first PCB surface except the first grounding layer.

In an alternative form, the second ground plane is uniformly spread over the third PCB surface.

In an alternative form, the metal patch is circular, and the diameter of the metal patch is a quarter of the waveguide wavelength.

In an alternative, the width of the antenna array is smaller than the width of the first ground plane.

According to another aspect of the embodiments of the present invention, there is provided a vehicle-mounted millimeter wave radar including the above-described antenna system.

In the embodiment of the present invention, the antenna system includes an antenna array and a first ground plane and a second ground plane of the antenna array, and the antenna array can radiate electromagnetic waves to a free space; a plurality of metal patches are arranged on the first PCB surface where the first grounding layer is located at intervals and used for adjusting the phase of the reflected electromagnetic waves formed after the electromagnetic waves are reflected. It can be seen that the plurality of metal patches are arranged on the first PCB at intervals, so that the phase of the reflected electromagnetic wave formed after the electromagnetic wave is reflected can be adjusted, the reflected electromagnetic wave and the electromagnetic wave radiated by the antenna array are superposed at a large angle, pits generated by a radiation pattern of the antenna array in the large-angle direction are eliminated, and the sensing capability of the antenna array in the large-angle direction is improved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.

Drawings

The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic structural diagram of an antenna system provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an antenna system according to another embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a directional diagram of an antenna system according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein.

Fig. 1 is a schematic structural diagram of an antenna system provided in an embodiment of the present invention, where the antenna system may be applied to a vehicle-mounted millimeter wave radar. As shown in fig. 1, the antenna system includes an antenna array 10 and a first ground plane 20 and a second ground plane 30 of the antenna array, where the first ground plane 20 and the second ground plane 30 are generally metal ground planes. The antenna array 10 is configured to radiate an electromagnetic wave to a free space, and a plurality of metal patches 60 are spaced on the first PCB where the first ground layer 20 is located, where the metal patches 60 are configured to adjust a phase of a reflected electromagnetic wave formed after the electromagnetic wave is reflected.

The frequency of electromagnetic waves radiated by the vehicle-mounted millimeter wave radar is high, and the wavelength is short. The electrical size of the antenna system is a ratio of the physical size to the wavelength of the electromagnetic wave, and under the condition that the physical size of the PCB of the antenna system is fixed, the shorter the wavelength of the electromagnetic wave is, the larger the electrical size of the PCB of the antenna system is. After the antenna array 10 is powered on, electromagnetic waves can be radiated to the free space. Part of the electromagnetic waves radiated by the antenna array 10 may be reflected by the second ground layer 30 to form reflected electromagnetic waves. The reflected electromagnetic waves and the electromagnetic waves radiated by the antenna array 10 can be mutually counteracted in the large-angle direction, so that a radiation pattern of the antenna array 10 generates pits in the large-angle direction, the large-angle gain of the vehicle-mounted millimeter wave radar is reduced, and the detection capability of the vehicle-mounted millimeter wave radar on obstacles in the large-angle direction is weakened.

Through arranging the plurality of metal patches 60 on the first PCB surface where the first ground layer 20 is located at intervals, after the reflected electromagnetic waves formed by the electromagnetic waves refracted by the second ground layer 30 pass through the metal patches 60, the phases are changed, so that the reflected electromagnetic waves and the electromagnetic waves radiated by the antenna array 10 are not mutually offset in the large-angle direction, pits can be prevented from being generated in the radiation pattern of the antenna array 10 in the large-angle direction, the large-angle gain of the vehicle-mounted millimeter wave radar is improved, and the detection capability of the vehicle-mounted millimeter wave radar on obstacles in the large-angle direction is enhanced.

In the embodiment of the present invention, the antenna system includes an antenna array and a first ground plane and a second ground plane of the antenna array, and the antenna array can radiate electromagnetic waves to a free space; a plurality of metal patches are arranged on the first PCB surface where the first grounding layer is located at intervals and used for adjusting the phase of the reflected electromagnetic waves formed after the electromagnetic waves are reflected. It can be seen that the plurality of metal patches are arranged on the first PCB at intervals, so that the phase of the reflected electromagnetic wave formed after the electromagnetic wave is reflected can be adjusted, the reflected electromagnetic wave and the electromagnetic wave radiated by the antenna array are superposed at a large angle, pits generated by a radiation pattern of the antenna array in the large-angle direction are eliminated, and the sensing capability of the antenna array in the large-angle direction is improved.

Among the PCBs of the antenna system, the antenna array 10 is located on the second PCB surface, and the second ground layer 30 is located on the third PCB surface. A first dielectric layer 40 is arranged between the first PCB surface and the second PCB surface, and a second dielectric layer 50 is arranged between the first PCB surface and the third PCB surface. In the embodiment of the present invention, the second PCB is located on the upper surface of the first dielectric layer 40, the first PCB is located on the lower surface of the first dielectric layer 40, and the third PCB is located on the lower surface of the second dielectric layer 50. The first dielectric layer 40 and the second dielectric layer 50 may support the antenna array 10, the metal patch 60, the first ground layer 20, and the second ground layer 30. Further, the geometric shape of the metal patch 60 may be square or circular. The antenna array 10 may be located in the middle of the second PCB surface, and the first ground plane 20 may be located in the middle of the first PCB surface, and the width of the antenna array 10 is smaller than that of the first ground plane 20.

Fig. 2 is a schematic structural diagram of an antenna system according to another embodiment of the present invention. As shown in fig. 2, the metal patch 60 has a square shape. The side length of the metal patch 60 may be designed according to actual needs, and the side length of the metal patch 60 may be, for example, a quarter of a waveguide wavelength. Further, the transverse spacing and the longitudinal spacing between adjacent metal patches 60 can be designed according to actual needs. The lateral spacing and the longitudinal spacing between adjacent metal patches 60 are each designed, for example, to be one-half of the waveguide wavelength.

The first ground plane 20 may be located right below the antenna array 10, and the metal patches 60 are distributed on the left and right sides of the first ground plane 20. Further, the metal patch 60 may be uniformly spread over the area of the first PCB surface except for the first ground layer. Further, the second ground layer 30 may be uniformly spread over the third PCB surface.

In another embodiment, the bonding profile of the metal patch 60 may be circular, with the diameter of the metal patch 60 being a quarter of the waveguide wavelength. The lateral spacing and the longitudinal spacing between adjacent metal patches 60 are each designed, for example, to be one-half of the waveguide wavelength.

Fig. 3 is a schematic diagram illustrating a directional diagram of an antenna system according to an embodiment of the present invention. As shown in fig. 3, the dotted line represents the pattern of the conventional antenna system, and the solid line represents the pattern of the antenna system of the present invention. It can be seen that a directional diagram of the traditional antenna system has a plurality of pits in the large-angle direction, so that the gain of the traditional antenna system in the large angle direction is lower, and the detection capability of the traditional antenna system on obstacles in the large-angle direction is weaker; the antenna system avoids pits in the large-angle direction, so that the antenna system has high large-angle gain and strong detection capability on obstacles in the large-angle direction.

In the embodiment of the present invention, the antenna system includes an antenna array and a first ground plane and a second ground plane of the antenna array, and the antenna array can radiate electromagnetic waves to a free space; a plurality of metal patches are arranged on the first PCB surface where the first grounding layer is located at intervals and used for adjusting the phase of the reflected electromagnetic waves formed after the electromagnetic waves are reflected. It can be seen that the plurality of metal patches are arranged on the first PCB at intervals, so that the phase of the reflected electromagnetic wave formed after the electromagnetic wave is reflected can be adjusted, the reflected electromagnetic wave and the electromagnetic wave radiated by the antenna array are superposed at a large angle, pits generated by a radiation pattern of the antenna array in the large-angle direction are eliminated, and the sensing capability of the antenna array in the large-angle direction is improved.

In addition, the embodiment of the invention also provides a vehicle-mounted millimeter wave radar which comprises the antenna system. The antenna system of the vehicle-mounted millimeter wave Rayleigh method comprises an antenna array and a first ground layer and a second ground layer of the antenna array, wherein the antenna array can radiate electromagnetic waves to a free space; a plurality of metal patches are arranged on the first PCB surface where the first grounding layer is located at intervals and used for adjusting the phase of the reflected electromagnetic waves formed after the electromagnetic waves are reflected. It can be seen that the plurality of metal patches are arranged on the first PCB at intervals, so that the phase of the reflected electromagnetic wave formed after the electromagnetic wave is reflected can be adjusted, the reflected electromagnetic wave and the electromagnetic wave radiated by the antenna array are superposed at a large angle, pits generated by a radiation pattern of the antenna array in the large-angle direction are eliminated, and the sensing capability of the vehicle-mounted millimeter wave radar method in the large-angle direction is improved.

It is to be noted that technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which embodiments of the present invention belong, unless otherwise specified.

In the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientations and positional relationships indicated in the drawings, which are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention.

Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Furthermore, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely below the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.