Radar antenna device

Abstract

A radar antenna apparatus for installation on a side surface of a vehicle is provided by the present disclosure.SOLUTION: The radar antenna apparatus includes a base including a first surface and a second surface opposite to the first surface, a first antenna PCB disposed on the first surface and including a first radar transmitting unit, and a second antenna PCB disposed on the first surface and including a second radar transmitting unit. The first and second radar transmitting units each transmit a radar signal that includes a strong signal region, a weak signal region, and a signal boundary therebetween. The average gain of the signal intensity of the strong signal region is greater than 0 dB, and the average gain of the signal intensity of the weak signal region is less than 0 dB. An intersection point is formed by the signal boundary of the radar signal, and a shortest distance between the intersection point and the second surface is between 30 mm and 80 mm.SELECTED DRAWING: FIG. 3B

Description

[Technical Field]

[0001] The present disclosure relates to a technology for a radar antenna device including a radar transmitting unit, and in particular to a radar antenna device installed in a vehicle. [Background technology]

[0002] Taiwan Patent Publication No. 202218235 discloses a flexible printed circuit radar antenna device with a field of view of more than 160 degrees, which includes a support base with a mounting surface and two inclined surfaces, two antenna boards which are flexible printed circuits, and a circuit board. China Patent Publication No. 112444812 discloses a vehicle radar device and system thereof.

[0003] The radiation field pattern of a conventional radar antenna is designed to be directional, radiating perpendicularly to the circuit board (or PCB) on which the radar antenna is mounted, along the normal. Therefore, within a certain angular range, there is better signal strength, which can be referred to as a strong signal area. Outside the strong signal area, there is an area of ​​weaker signal strength, which can be referred to as a detection blind spot. To expand the range of the strong signal area, radar antennas composed of multiple circuit boards have been developed. However, there still exist detection blind spots that affect the detection ability of the radar antenna. Therefore, it is necessary to develop a technology to reduce the detection blind spot of a radar antenna. Summary of the Invention

[0004] The present disclosure relates to a technology for a radar antenna device including a radar transmitting unit, and in particular to a radar antenna device installed in a vehicle.

[0005] According to a first aspect of the present disclosure, a radar antenna device for installation on a side surface of a vehicle moving along a first direction includes a base having a first surface and a second surface opposite to the first surface. The radar antenna device also includes a first antenna printed circuit board (hereinafter referred to as PCB) disposed on the first surface and including a first radar transmitting unit. The radar antenna device also includes a second antenna PCB disposed on the first surface and including a second radar transmitting unit. The first radar transmitting unit and the second radar transmitting unit transmit a first radar signal and a second radar signal, respectively, and both the first radar signal and the second radar signal include a strong signal region and a weak signal region, with a signal boundary located between the strong signal region and the weak signal region. An average gain of the signal strength of each of the strong signal regions is greater than 0 dB, and an average gain of the signal strength of each of the weak signal regions is less than 0 dB. The signal boundary of the first radar signal and the signal boundary of the second radar signal form an intersection point, and the shortest distance between the intersection point and the second surface is between 30 mm and 80 mm.

[0006] According to a second aspect of the present disclosure, a vehicle moving along a first direction includes a side surface parallel to the first direction, and the vehicle also includes the radar antenna apparatus disclosed in the first aspect of the present disclosure mounted on the side surface.

[0007] These and other aspects of the present invention will be better understood with regard to the following detailed description of preferred but non-limiting embodiments, the following description being made with reference to the accompanying drawings. [Brief explanation of the drawings]

[0008] FIG. 1 is a diagram illustrating an example of an antenna PCB in accordance with one or more embodiments of the present disclosure.

[0009] FIG. 2 is a diagram illustrating the signal zone of an example antenna PCB including a radar transmitting unit, in accordance with one or more embodiments of the present disclosure.

[0010] FIG. 3A illustrates a top view along the Z axis of an example radar antenna apparatus in accordance with one or more embodiments of the present disclosure.

[0011] FIG. 3B is a diagram illustrating an example of a radar antenna apparatus, in accordance with one or more embodiments of the present disclosure.

[0012] 4A and 4B are diagrams illustrating a perspective view along the X-axis of a radar antenna apparatus and a radar antenna PCB, respectively, in accordance with one or more embodiments of the present disclosure.

[0013] 5A and 5B are diagrams illustrating a perspective view along the X-axis of a radar antenna apparatus and a radar antenna PCB, respectively, in accordance with one or more embodiments of the present disclosure.

[0014] 6A and 6B are diagrams illustrating a perspective view along the X-axis of a radar antenna apparatus and a radar antenna PCB, respectively, in accordance with one or more embodiments of the present disclosure.

[0015] FIG. 6C illustrates an external view of a radar antenna apparatus along the X-axis, in accordance with one or more embodiments of the present disclosure.

[0016] FIG. 6D illustrates a bottom view of a radar antenna apparatus along the z-axis, in accordance with one or more embodiments of the present disclosure.

[0017] FIG. 6E illustrates a three-dimensional view of a radar antenna apparatus in accordance with one or more embodiments of the present disclosure.

[0018] Like reference numbers and designations in the various drawings indicate like elements. It should also be understood that the various exemplary implementations shown in the drawings are merely illustrative representations and are not necessarily drawn to scale.

[0019] FIG. 1 illustrates an antenna PCB 110 according to one embodiment of the present disclosure. As illustrated in FIG. 1 , the antenna PCB 110 includes a radar transmitting unit 111 and a radar receiving unit 112, where the radar transmitting unit 111 and the radar receiving unit 112 are disposed on a first surface 116 of the antenna PCB 110. The radar transmitting unit 111 of the antenna PCB 110 can transmit a radar signal, and the radar receiving unit 112 receives the radar signal reflected by an object to detect the object. In the embodiment illustrated in FIG. 1 , the radar transmitting unit 111 and the radar receiving unit 112 disposed on the antenna PCB 110 are each a single unit, but the present disclosure is not limited thereto. In other embodiments, multiple radar transmitting units and multiple radar receiving units may be disposed on the antenna PCB. For example, two radar transmitting units and four radar receiving units may be disposed on the antenna PCB, or the design may be adjusted according to other requirements. The antenna PCB also includes a processing unit 113, which may be disposed on the first surface 116 or on another side of the antenna PCB 110 according to actual needs. The processing unit 113 may be electrically connected to the radar transmitting unit 111 and the radar receiving unit 112 for processing the transmitted and received radar signals. According to the radar antenna's radiation field pattern, the radar transmission strength varies in different directions within a hemispherical area on the first surface 116 of the antenna PCB 110, which will be described in detail below with reference to FIG. 2.

[0020] FIG. 2 is a diagram illustrating a signal zone of an antenna PCB 110 including a radar transmitting unit 111 according to one embodiment of the present disclosure. In this embodiment, the radar antenna radiation field pattern of the radar transmitting unit 111 is designed to be directional; in other words, the radar transmission strength (gain) is stronger at a specific angle. In this embodiment, the signal transmission strength of the radar transmitting unit 111 radiates from the center of the radar transmitting unit 111 toward a normal 115c perpendicular to the first surface 116 of the antenna PCB 110. The normal 115c passes through the center of the radar transmitting unit 111, and the gain of the signal transmission strength of the radar transmitting unit 111 in the direction along the normal 115c is strongest. Furthermore, in the example of FIG. 2, the x-direction and the y-direction are interchangeable. From Table 1 below, it can be seen that the area within angles ranging from -70° to 0° and 0° to 70° relative to the normal 115c of the first surface 116 of the antenna PCB 110, which corresponds to a total field of view (FoV) of 140°, is defined as the first signal area 113a with better signal transmission strength (having an average gain of 4.62 to 10.79 dB), and the area within angles ranging from 70° to 90° and from -70° to -90° relative to the normal 115c of the first surface 116 of the antenna PCB 110 is defined as the second signal area 113b with weaker signal transmission strength (less signal gain) (having an average gain of -4.75 to -6.31 dB). Table 1: Antenna transmission strength vs. angle TIFF2026035522000002.tif38162

[0021] 3A and 3B , the radar antenna device 100 includes a base 120 and two antenna PCBs (antenna PCB 110a and antenna PCB 110b). The structure of each of the antenna PCBs 110a and 110b is identical to that of the antenna PCB 110 described above, and includes a radar transmitting unit 111a and a radar transmitting unit 111b disposed on a first surface 116a and a first surface 116b, respectively. Here, the antenna PCB 110a, the antenna PCB 110b, and the base 120 are arranged in a substantially triangular shape. The first surface 116a and the first surface 116b both face away from the base 120. Because the base 120 forms an angle with the two antenna PCBs (antenna PCB 110a and antenna PCB 110b), some areas cannot be located within an angle of less than 70° from the normal of the two PCBs, and some areas are located in the second signal area 113b with weaker transmission signal strength. Therefore, a radar detection blind spot is formed, which will be described in detail below with reference to Figures 3A and 3B.

[0022] 3A is a diagram illustrating a top view along the Z axis of the radar antenna apparatus 100 according to one embodiment of the present disclosure. The antenna PCB 110a includes a radar transmitting unit 111a and a radar receiving unit 112a that are offset in the Y axis direction from the radar transmitting unit 111b and the radar receiving unit 112b of the antenna PCB 110b. In this embodiment, the connecting line 117b between the center 111ac of the radar transmitting unit 111a and the center 111bc of the radar transmitting unit 111b and the second center point are not parallel to the direction in which the vehicle moves forward or backward (the Y axis).

[0023] 3B is a diagram illustrating a radar antenna apparatus 100 according to one embodiment of the present disclosure. The radar antenna apparatus 100 includes an antenna PCB 110a and an antenna PCB 110b. The radar transmitting unit 111a is disposed on a first surface 116a of the antenna PCB 110a, and the radar transmitting unit 111b is disposed on a first surface 116b of the antenna PCB 110b. The radar antenna apparatus 100 also includes a base 120 including a first base surface 126a and a second base surface 126b opposite the first base surface 126a. The antenna PCB 110a and the antenna PCB 110b are mounted directly or indirectly on the first base surface 126a by a mounting unit (not shown). When the radar antenna apparatus 100 is installed on a vehicle side surface 310, the second base surface 126b is parallel to and / or directly contacts the vehicle side surface 310. In other embodiments, the radar antenna apparatus 100 may be installed on a flat surface of another moving vehicle. As shown in FIG. 3B , along the Z axis, the radar transmitting unit 111a and the radar transmitting unit 111b on the antenna PCB 110a and the antenna PCB 110b are both closer to the base 120 than the radar receiving unit 112a and the radar receiving unit 112b. As shown in FIG. 3B , in this embodiment, the Y axis is the direction in which the vehicle moves forward or backward, the Y axis is parallel to the vehicle side surface 310, the Z axis extends outward from the vehicle side surface 310, and the -Z axis extends inward from the vehicle side surface 310. Both the normal 115c on the first surface 116a of the antenna PCB 110 and the normal 115c on the first surface 116b of the antenna PCB 110b extend toward the outside of the vehicle side surface 310. To further explain, when the vehicle side 310 is parallel to the Y axis, the normal 115c on the first surface 116a of the antenna PCB 110a radiates in the direction of the second quadrant formed by the -Y axis and the Z axis, and the normal 115c on the first surface 116b of the antenna PCB 110b radiates in the direction of the first quadrant formed by the Y axis and the Z axis. Here, the first surface 116a of the antenna PCB 110a and the first surface 116b of the antenna PCB 110b each face in a direction away from the base 120.In some implementations, the radar antenna apparatus 100 is installed in a large vehicle, such as a large truck or van with a tow vehicle, where the large vehicle includes a motorized vehicle body and a non-motorized tow vehicle, and the radar antenna apparatus 100 is installed in the motorized vehicle body. As discussed above, the first signal regions 113a of the radar transmitting unit 111a and the radar transmitting unit 111b are located within angles with the normals 115c of the first surfaces 116a and 116b of the radar transmitting unit 111a and 111b ranging from 0° to 70° and from −70° to 0°, respectively (a total FoV of 140°). In FIG. 3A , the triangular region formed by the intersection (vertex 117a) of the upper boundaries 115a of the two first signal regions 113a and the first connecting line 117b between the center 111ac of the radar transmitting unit 111a and the center 111bc of the radar transmitting unit 111b is the detection blind spot region 117. The detection blind spot area 117 is not located within the first signal area 113a and completely overlaps with the second signal area 113b, which has a weaker signal strength. The detection blind spot area 117 even includes areas where there is no signal. In one embodiment, the first surfaces 116a and 116b of the two antenna PCBs 110a and 110b form a first angle 114a and a second angle 114b, respectively, with the first surface 126a of the base 120, and the antenna PCBs 110a and 110b are separated by a first distance 115d. The first distance 115d is the shortest distance between the antenna PCBs 110a and 110b, and the first angle 114a, the second angle 114b, and the first distance 115d affect the size of the detection blind spot area 117. In this embodiment, the second distance 115e is between the vertex 117a of the detection blind spot zone 117 and the second base surface 126b of the base 120. When the first angle 114a, the second angle 114b, and / or the first distance 115d decrease, the first connecting line 117b and the second distance 115e of the detection blind spot zone 117 are shortened, i.e., the detection blind spot zone 117 is reduced. Conversely, when the first angle 114a, the second angle 114b, and / or the first distance 115d increase, the first connecting line 117b and the second distance 115e of the detection blind spot zone 117 are increased, i.e., the detection blind spot zone 117 is increased.Furthermore, as the first angle 114a and the second angle 114b decrease, the second signal area 113b between the antenna PCB 110a, the antenna PCB 110b, and the vehicle side surface 310 increases. As the first angle 114a and the second angle 114b increase, the second signal area 113b between the antenna PCB 110a, the antenna PCB 110b, and the vehicle side surface 310 decreases.

[0024] 3B, the vertical distance 115f between the highest point of the antenna PCB 110a and the antenna PCB 110b and the second base surface 126b of the base 120 affects the installation height of the radar antenna apparatus 100, which is also the distance that the radar antenna apparatus 100 protrudes from the vehicle body (e.g., the vehicle side surface 310). Techniques provided by the present disclosure for reducing the detection blind spot region 117 of a radar antenna apparatus are described in detail below with reference to FIGS. 4A to 6A.

[0025] 4A and 4B are perspective views of a radar antenna apparatus 100′ along the X-axis and a radar antenna PCB 110, respectively, in accordance with one or more embodiments of the present disclosure. As shown in FIG. 4A , the radar antenna apparatus 100′ is mounted on a vehicle side surface 310 and includes an antenna PCB 110a, an antenna PCB 110b, and a base 120′. In this embodiment, a first base surface 126a′ of the base 120′ is a protruding surface, and the antenna PCBs 110a and 110b are indirectly attached to the first base surface 126a′ of the base 120′ by brackets (not numbered). A second base surface 126b′ of the base 120′ is a flat surface facing and parallel to the vehicle side surface 310. 4A is different from the radar antenna apparatus 100 of FIG. 3B in that the radar antenna apparatus 100' further includes a case 200 that covers the antenna PCB 110a, the antenna PCB 110b, and the base 120'. The case 200 is used to protect and isolate the antenna PCB 110a and the antenna PCB 110b from corrosion by water vapor. In one embodiment, according to the radar antenna apparatus 100' shown in FIG. 4A, the case 200 includes two case surfaces (case surface 200a and case surface 200b), a top surface 200t disposed between the case surface 200a and the case surface 200b, and a partition 200s coupled to the top surface 200t and extending toward the base 120'. In one embodiment, the partition 200s can extend between the antenna PCB 110a and the antenna PCB 110b, and the case surface 200a and the case surface 200b cover and are parallel to the antenna PCB 110a and the antenna PCB 110b, respectively, where the top surface 200t is planar and located above the first distance 115d, and the shortest vertical distance 115g between the top surface 200t and the vehicle side surface 310 is greater than the vertical distance 115f. In one embodiment, the difference in length between the vertical distance 115g and the vertical distance 115f is between 0.1 mm and 20 mm.4B , in one embodiment, the antenna PCB 110 (which can simultaneously refer to the antenna PCB 110a and the antenna PCB 110b) is approximately square, where the lengths of the four sides of the antenna PCB 110 are identical, and the length L and width W are both between 50 mm and 70 mm, e.g., 59 mm. The first angle 114a between the first surface 116a of the antenna PCB 110a and the second base surface 126b' of the base 120', and the second angle 114b between the first surface 116b of the antenna PCB 110b and the second base surface 126b' of the base 120' are between 25 degrees and 50 degrees, e.g., 40 degrees. The angles 113θ1 and 113θ2 between the lower boundaries 115b of the two first signal regions 113a and the vehicle side surface 310 are between 15 degrees and 25 degrees, e.g., 20 degrees. The shortest first distance 115d between the antenna PCB 110a and the antenna PCB 110b is between 0 mm and 10 mm, for example, 5.3 mm, so that the second distance 115e between the vertex 117a of the detection blind spot area 117 and the second base surface 126b' of the base 120' is between 50 mm and 100 mm, for example, 73.7 mm. The maximum vertical distance 115f between the antenna PCB 110a and / or the antenna PCB 110b and the second base surface 126b' of the base 120' is between 30 mm and 50 mm, for example, 47.4 mm, so that the shortest vertical distance 115g between the top surface 200t of the case 200 and the vehicle side surface 310 is between 30.1 mm and 50 mm, for example, 47.5 mm and 50 mm (related to the installation height of the radar antenna device 100'). In other words, with such a design, the second distance 115e can be reduced to a range of 50 mm and 80 mm, e.g., 73.6 mm (reducing the detection blind spot area). In one embodiment, the radar antenna apparatus 100' also includes a waterproof exit feature 140 configured to electrically connect to an external device (such as a control unit or processing unit) for signal transmission, such as a detection signal of the radar antenna apparatus 100'.

[0026] 5A and 5B are diagrams illustrating a perspective view along the X-axis of a radar antenna apparatus 100'' and a radar antenna PCB 110'', respectively, according to one embodiment of the present disclosure. The difference between the radar antenna apparatus 100'' and the radar antenna apparatus 100' is that the dimensions of the antenna PCB 110'', which can simultaneously represent both the antenna PCB 110a'' and the antenna PCB 110b'', as shown in FIG. 5B, are different from the dimensions of the antenna PCB 110 of the radar antenna apparatus 100'. The antenna PCB 110'' is approximately rectangular and includes a side length S and a short side S' that is shorter than the side length S of the radar antenna PCB 110. In one embodiment, the length L of the side length S of the radar antenna PCB 110'' is between 44 mm and 64 mm, e.g., 54 mm, and the width W of the short side S' of the radar antenna PCB 110'' is between 30 mm and 50 mm, e.g., 39.2 mm. In one embodiment, the side length S of the antenna PCB 110a'' and the antenna PCB 110b'' is parallel to the second base surface 126b'' of the base 120'', and the first angle 114a and the second angle 114b formed, respectively, between the short side S' and the second base surface 126b'' of the base 120'' are between 22 degrees and 47 degrees, for example 37 degrees, so that the second distance 115e between the vertex 117a of the detection blind spot area 117 and the second base surface 126b'' of the base 120'' is reduced to a range of 30 mm to 50 mm, for example 44.8 mm. The maximum vertical distance 115f between the second base surface 126b'' of the base 120'' and the highest point of the antenna PCB 110a'' and the antenna PCB 110b'' is reduced to less than 30 mm, for example 27.6 mm, so that the minimum vertical distance 115g between the top surface 200t of the case 200 and the vehicle side surface 310 can be reduced to a range of 27.7 mm to 47.6 mm (related to the installation height of the radar antenna apparatus 100''). In one embodiment, the radar antenna apparatus 100'' also includes a waterproof exit feature 140 configured to electrically connect to an external device (such as a control unit or a processing unit) for signal transmission, such as detection signals, of the radar antenna apparatus 100''.

[0027] 6A through 6E are diagrams illustrating a radar antenna apparatus 100A according to one or more embodiments of the present disclosure, where FIGS. 6A and 6B respectively show a perspective view of the radar antenna apparatus 100A along the x-axis and the radar antenna PCB 110'', FIG. 6C shows an external view of the radar antenna apparatus 100A along the x-axis, FIG. 6D shows a bottom view of the radar antenna apparatus 100A along the z-axis, and FIG. 6E shows a three-dimensional view of the radar antenna apparatus 100A.

[0028] As shown in FIGS. 6A, 6B, and 6C, the radar antenna device 100A differs from the radar antenna device 100'' in that the antenna PCB 110a'' and the antenna PCB 110b'' are covered by a first case 130a and a second case 130b, respectively, and the first case 130a and the second case 130b each include a plurality of connecting portions 130c coupled to a base 120A (shown in FIG. 6C) installed on the vehicle side surface 310. As shown in FIG. 6D, the base 120A includes two sets of brackets 150 disposed on both sides of the first case 130a and the second case 130b, respectively. Each set of brackets 150 includes an upper mounting bracket 150a and a lower mounting bracket 150b, where the upper mounting bracket 150a is detachably coupled to the connecting portions 130c, and the lower mounting bracket 150b is detachably coupled to the vehicle side surface 310. As shown in FIG. 6E, the upper mounting bracket 150a and the lower mounting bracket 150b form an "L" shape.

[0029] As shown in FIG. 6A, the antenna PCB 110a'' and the antenna PCB 110b'' are separated by a first case 130a and a second case 130b, respectively, and the shortest first distance 115d between the antenna PCB 110a'' and the antenna PCB 110b'' is between 10 mm and 30 mm, for example, 18.4 mm, and as a result, the second distance 115e between the vertex 117a of the detection blind spot area 117 and the second base surface 126bA of the base 120A is between 50 mm and 70 mm, for example, 61.7 mm. The vertical distance 115f between the second base surface 126bA of the base 120A and the highest point of the antenna PCB 110a'' and the antenna PCB 110b'' is between 30 mm and 40 mm, for example, 33.8 mm, so that the maximum vertical distance 115g between the vertex 130t of the first case 130a and the second case 130b and the second base surface 126bA of the base 120A is between 30.1 mm and 50 mm, for example, between 40 mm and 50 mm (related to the installation height of the radar antenna apparatus 100A). In other words, with such a design, the second distance 115e can be reduced to 67.1 mm (reducing the detection blind spot area), and the vertical distance 115g can be reduced to 40 mm (reducing the installation height). In this embodiment, the radar antenna apparatus 100A also includes connectors 140a and 140b (shown in FIG. 6D), which are coupled to the antenna PCB 110a'' and the antenna PCB 110b'', respectively, and are configured to electrically connect to an external device (such as a control unit or a processing unit) to transmit signals, such as detection signals, of the radar antenna apparatus 100A.

[0030] 6C , the upper mounting bracket 150a includes two inclined surfaces 150a1 and 150a2 that are parallel to the bottom surface 130a1 of the first case 130a and the bottom surface 130b1 of the second case 130b, respectively. In one embodiment, the respective angles between the inclined surfaces 150a1 and 150a2 and the second base surface 126bA of the base 120A can be used to determine the first angle 114a and the second angle 114b to be between 30 degrees and 50 degrees, for example, 37 degrees. Here, the first angle 114a and the second angle 114b are formed between the antenna PCB 110a″ and the antenna PCB 110b″ and the second base surface 126bA of the base 120A. In another embodiment, since the vehicle surface on which the radar antenna device 100A needs to be mounted may not be flat or completely perpendicular to the ground, the upper mounting bracket 150a and the lower mounting bracket 150b may be connected by connecting parts (not shown) such as screws to adjust the angle so that when the radar antenna device 100A is installed on the surface of the vehicle, the second base surface 126bA of the base 120A is as perpendicular to the ground as possible and parallel to the direction of movement of the vehicle (e.g., forward or backward of the vehicle).

[0031] According to the above embodiments and examples, when the radar detection range coverage (FoV) of the radar transmitting unit on the antenna PCB is 140 degrees, the technology provided by the present disclosure can utilize two angles between the lower boundary of the FoV of the antenna PCB and the base, as well as the distance between one end of the two antenna PCBs, to adjust and reduce the detection blind spot zone and reduce the distance between the apex of the detection blind spot zone and the surface of the vehicle body, thereby improving the reliability of the radar antenna device for detecting objects close to the vehicle body and improving driving safety, especially when applied to large vehicles.

[0032] While this document may contain many details, these should not be construed as limitations on the scope of the claimed invention or what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features described in this document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, even if some features are described above as working in a particular combination and even initially claimed as such, one or more features from the claimed combination can, in some cases, be separated from that combination, and the claimed combination may be directed to a subcombination or variation of the subcombination. Similarly, although operations may be depicted in a particular order in the figures, this should not be understood as requiring such operations to be performed in the particular order shown, or in a sequential order, or that all of the illustrated operations be performed, to achieve desirable results.

[0033] Only a few examples and implementations have been disclosed. Variations, modifications, and enhancements to the described examples and implementations, as well as other implementations, can be made based on what is disclosed.

Claims

1. 1. A radar antenna apparatus for installation on a side surface of a vehicle moving along a first direction, comprising: a base having a first surface and a second surface opposite the first surface; a first antenna printed circuit board (PCB) disposed on the first surface and comprising a first radar transmitting unit; a second antenna PCB disposed on the first surface and comprising a second radar transmitting unit; wherein the first radar transmitting unit and the second radar transmitting unit transmit a first radar signal and a second radar signal, respectively, and both the first radar signal and the second radar signal include a strong signal region and a weak signal region, and a signal boundary is between the strong signal region and the weak signal region; wherein the average gain of the signal strength in the strong signal region is greater than 0 dB, and the average gain of the signal strength in the weak signal region is less than 0 dB; wherein an intersection is formed by the signal boundary of the first radar signal and the signal boundary of the second radar signal, and a shortest distance between the intersection and the second surface is between 30 mm and 80 mm.

2. When viewed from above, the first radar transmitting unit has a first center point and the second radar transmitting unit has a second center point; 2. The radar antenna device according to claim 1, wherein a line connecting the first center point and the second center point is not parallel to the first direction.

3. the first antenna PCB includes a first radar receiving unit, and the second antenna PCB includes a second radar receiving unit; wherein the first radar transmitting unit has a first center point, the second radar transmitting unit has a second center point, and the first center point, the second center point, and the intersection point form a detection blind spot area; 2. The radar antenna device according to claim 1, wherein the first radar receiving unit and the second radar receiving unit are located in the detection blind spot area.

4. the first antenna PCB and the first surface form a first angle, the second antenna PCB and the first surface form a second angle; 2. The radar antenna apparatus of claim 1, wherein both the first angle and the second angle are between 25 and 50 degrees.

5. The radar antenna device according to claim 1 , further comprising a case that covers the first antenna PCB and the second antenna PCB.

6. 6. The radar antenna arrangement according to claim 5, wherein the shortest distance between the first antenna PCB and the second antenna PCB is between 0 mm and 10 mm.

7. further comprising a first case covering the first antenna PCB and a second case covering the second antenna PCB; 2. The radar antenna device according to claim 1, wherein the first case is not in direct contact with the second case.

8. 8. The radar antenna arrangement according to claim 7, wherein the shortest distance between the first antenna PCB and the second antenna PCB is between 10 mm and 30 mm.

9. the base includes a plurality of brackets coupled to the first case and the second case; 8. The radar antenna device according to claim 7, wherein the plurality of brackets are arranged on both sides of the first case.

10. 2. The radar antenna apparatus of claim 1, wherein the side surface of the vehicle is parallel to the first direction.

11. 1. A radar antenna apparatus for installation on a side surface of a vehicle moving along a first direction, comprising: a base having a first surface and a second surface opposite the first surface; a first antenna PCB disposed on the first surface and having a first side length; a second antenna PCB disposed on the first surface and having a second side length; wherein the first side length and the second surface form a first angle, and the second side length and the second surface form a second angle; wherein both the first side length and the second side length are between 30 mm and 50 mm, both the first angle and the second angle are between 22 degrees and 47 degrees, and the maximum vertical distance between the second surface and the first antenna PCB or the second antenna PCB is less than 30 mm.

12. the first antenna PCB comprises a first radar transmitting unit, and the second antenna PCB comprises a second radar transmitting unit; wherein the first radar transmitting unit and the second radar transmitting unit transmit a first radar signal and a second radar signal, respectively, and both the first radar signal and the second radar signal include a strong signal region and a weak signal region, and a signal boundary is between the strong signal region and the weak signal region; wherein the average gain of the signal strength in the strong signal region is greater than 0 dB, and the average gain of the signal strength in the weak signal region is less than 0 dB; 12. The radar antenna apparatus of claim 11, wherein the signal boundary of the first radar signal and the signal boundary of the second radar signal form an intersection point, and a shortest distance between the intersection point and the second surface is between 40 mm and 70 mm.

13. When viewed from above, the first radar transmitting unit has a first center point and the second radar transmitting unit has a second center point; 13. The radar antenna apparatus according to claim 12, wherein a line connecting the first center point and the second center point is not parallel to the first direction.

14. the first antenna PCB includes a first radar receiving unit, and the second antenna PCB includes a second radar receiving unit; wherein the first radar transmitting unit has a first center point, the second radar transmitting unit has a second center point, and the first center point, the second center point, and the intersection point form a detection blind spot area; The radar antenna device according to claim 12, wherein the first radar receiving unit and the second radar receiving unit are located in the detection blind spot area.

15. further comprising a first case covering the first antenna PCB and a second case covering the second antenna PCB; The radar antenna device according to claim 11, wherein the first case is not in direct contact with the second case.

16. 16. The radar antenna arrangement according to claim 15, wherein the shortest distance between the first antenna PCB and the second antenna PCB is between 10 mm and 30 mm.

17. the base includes a plurality of brackets coupled to the first case and the second case; 16. The radar antenna device according to claim 15, wherein the plurality of brackets are arranged on both sides of the first case.

18. 12. The radar antenna arrangement of claim 11, wherein the side surface of the vehicle is parallel to the first direction.

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