Microstrip patch antenna for wide-angle radar and wide-angle radar module

Abstract

The utility model provides a microstrip patch antenna for a wide-angle radar and a wide-angle radar module. The microstrip patch antenna comprises a PCB medium, a reference ground, a series feed microstrip line, a normal radiation unit and a differential radiation unit, wherein the reference ground and the series feed microstrip line are integrated on the PCB medium, and the normal radiation unit and the differential radiation unit are located on the same central axis. The normal radiation unit is connected in series with the differential radiation unit through the series feed microstrip line, and the radiation edges of the normal radiation unit and the differential radiation unit are in a spatial vertical relationship. While the microstrip patch antenna has sum-difference beam characteristics, the synthesized radiation angle has wide wide-angle performance, and the radiation field angles in all directions are basically the same; compared with a sum-difference array antenna, the size of the antenna is obviously reduced, and the radar integration level is improved; in addition, the antenna size is obviously reduced, the antenna loss can be obviously reduced, and the antenna radiation efficiency is improved. Finally, the microstrip patch antenna is an antenna in a non-traditional array mode, does not affect the layout of an existing radar module, is convenient to install, and facilitates radar application.

Description

Technical Field

[0001] The utility model relates to the technical field of radar, in particular to a microstrip patch antenna for wide-angle radar and a wide-angle radar module. Background Art

[0002] In the current radar field, millimeter wave technology has become a key technology and has received widespread attention. Due to the short wavelength of millimeter waves, smaller antennas can be designed. Connecting antennas with active chips to form modules has become the main way to realize millimeter wave systems. It uses microstrip patch antennas to connect active millimeter wave chips with microstrip patch antennas, and feeds power to the antenna through the chip to achieve normal operation of the system.

[0003] As radar technology is gradually being used for civilian purposes, microwave radar, as a sensor, is used in a variety of consumer products. Microwave radar sensors can be installed covertly and are not affected by temperature, airflow, dust, and smoke. They have the advantages of long life, fast response, higher sensitivity, and a wide sensing area. They are also widely used in energy-saving lighting, smart home appliances, and other fields.

[0004] At present, with the demand for radar module application scenarios, products require a wider sensing range of radar modules, that is, the radar needs a wider field of view; at the same time, the size and cost of the radar cannot be significantly increased, so as not to increase the difficulty of radar layout and versatility. Usually, radar sensors use microstrip patch antennas. Radar patch antennas themselves are directional radiation antennas, and it is difficult to achieve omnidirectional and semi-omnidirectional radiation. Usually, the effective way to change the field of view is to form an array, but the array antenna will increase the size of the radar exponentially; and non-array solutions often have special requirements for the installation method and structural design of the entire product, which has an unignorable limitation on the application of radar in products. Utility Model Content

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present utility model is to provide a microstrip patch antenna for wide-angle radar and a wide-angle radar module, which is used to solve the problem that the radar antenna for wide-angle (i.e. wider field of view) requirements in the prior art adopts an array method to increase the field of view, which will increase the size of the radar; the non-array method puts forward higher requirements on the installation method and structural design of the whole product, which is not conducive to the application of radar in the product.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides a microstrip patch antenna for wide-angle radar, the microstrip patch antenna comprising: a PCB medium and a reference ground integrated on the PCB medium, a rectangular normal radiation unit, a rectangular differential radiation unit, and a series-fed microstrip line; wherein,

[0007] The normal radiating unit, the differential radiating unit and the series-fed microstrip line are arranged in a metal layer form and are spaced apart from the reference ground on the same side of the reference ground to form the microstrip patch antenna with the reference ground;

[0008] The normal radiation unit is connected in series with the differential radiation unit through the series feeding microstrip line;

[0009] The normal radiation unit has a feeding point, and the feeding point is located on a radiation edge of the normal radiation unit away from the differential radiation unit;

[0010] The normal radiating unit and the differential radiating unit are located on the same central axis, and the series-fed microstrip line is located on the central axis;

[0011] The normal radiation unit radiation side of the normal radiation unit and the differential radiation unit radiation side of the differential radiation unit are in a spatially vertical relationship;

[0012] The length L of the non-radiating side of the normal radiation unit is N1 is r / 2, the length of the normal radiation unit radiation side L R1 1.0L N1 ~1.5L N1 ,λ r is the wavelength of the electromagnetic wave propagating in the PCB medium at the antenna operating frequency;

[0013] The differential radiation unit is divided into two mirrored parts along the central axis, and the non-radiating side length L of the differential radiation unit in each part is N2 = L N1 , the radiation side length L of the differential radiation unit in each part R2 0.25L N2 ~0.5L N2 ;

[0014] The geometric center distance D between the normal radiation unit and the differential radiation unit is 0.4λ r ~0.6λ r .

[0015] Optionally, the geometric center distance D between the normal radiation unit and the differential radiation unit is 0.5λ r .

[0016] Optionally, the normal radiation unit and the differential radiation unit are located on the same metal layer on the PCB medium.

[0017] Furthermore, the normal radiation unit and the differential radiation unit are located on the outermost metal layer on the PCB medium.

[0018] The utility model also provides a wide-angle radar module, which comprises: a radar chip, two identical microstrip patch antennas as described in any one of the above, and a feeding network; wherein,

[0019] One of the two microstrip patch antennas is used as a receiving antenna, and the other is used as a transmitting antenna;

[0020] The radar chip is connected to the receiving antenna and the transmitting antenna respectively through the feeding network to receive and send radio frequency signals respectively;

[0021] The radar chip, the receiving antenna, the transmitting antenna and the feeding network are integrated on the same PCB medium.

[0022] Optionally, the receiving antenna and the transmitting antenna share a same reference ground, and the normal radiation unit and the differential radiation unit of the receiving antenna and the transmitting antenna are both on the same side of the reference ground.

[0023] Furthermore, the normal radiation unit and the differential radiation unit of the receiving antenna and the transmitting antenna are located on the same metal layer on the PCB medium.

[0024] Furthermore, the normal radiation unit and the differential radiation unit of the receiving antenna and the transmitting antenna are located on the outermost metal layer on the PCB medium.

[0025] Optionally, the receiving antenna and the transmitting antenna are arranged 180° opposite to each other.

[0026] Optionally, the receiving antenna and the transmitting antenna are arranged to be orthogonal at 90°.

[0027] Optionally, the radar chip and the two microstrip patch antennas are arranged on opposite sides of the PCB medium and are electrically connected through conductive vias.

[0028] As described above, the microstrip patch antenna and wide-angle radar module for wide-angle radar of the utility model have the characteristics of sum and difference beams, and the synthesized radiation angle has a wider wide-angle performance, and the radiation field angles in all directions are basically the same; at the same time, the size of the antenna is significantly reduced compared to the sum and difference array antenna, which is convenient for improving the integration of radar; in addition, while the antenna size is significantly reduced, the antenna loss can also be significantly reduced and the antenna radiation efficiency can be improved; finally, the microstrip patch antenna for wide-angle radar is an antenna with a non-traditional array method, which will not affect the layout of the existing radar module, is easy to install, and is conducive to the application of radar in products. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1Shown is a plan schematic diagram of a microstrip patch antenna for wide-angle radar according to the present invention, wherein the PCB medium is not shown.

[0030] Figure 2 and Figure 3 Shown is a plan schematic diagram of a microstrip patch antenna for wide-angle radar of the present invention, wherein a PCB medium and a reference ground are not shown.

[0031] Figure 4 Display as Figure 1 Radiation pattern of the microstrip patch antenna for wide-angle radar along the vertical plane.

[0032] Figure 5 Display as Figure 1 Radiation pattern of the microstrip patch antenna for wide-angle radar along the horizontal plane.

[0033] Figure 6 Display as Figure 1 Actual radiation patterns of the microstrip patch antenna for wide-angle radar along the horizontal and vertical planes.

[0034] Figure 7 Shown is a comparison diagram of the areas of the microstrip patch antenna for wide-angle radar of the utility model and the traditional sum-difference beam array antenna.

[0035] Figure 8 Shown is a plan view of a wide-angle radar module according to an example of the present invention.

[0036] Fig. 9 Display as Figure 8 Fitted radiation patterns of the receiving and transmitting antennas in the wide-angle radar module.

[0037] Fig.10 Shown is a plan view of a wide-angle radar module according to another example of the present invention.

[0038] Fig.11 Display as Fig.10 Fitted radiation patterns of the receiving and transmitting antennas in the wide-angle radar module.

[0039] Component number description

[0040] 10 microstrip patch antenna, 100 PCB medium, 101 reference ground, 102 normal radiating unit, 103 differential radiating unit, 103a first part, 103b second part, 104 series fed microstrip line, 105 feeding point, 106 feeding point fed microstrip line, 107 central axis, 108a radiating edge of normal radiating unit, 108b non-radiating edge of normal radiating unit, 109a radiating edge of differential radiating unit, 109b non-radiating edge of differential radiating unit, 20 radar chip, 21 receiving antenna, 22 transmitting antenna. DETAILED DESCRIPTION

[0041] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] See also Figures 1 to 11 It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0043] like Figure 1 and Figure 2 As shown, this embodiment provides a microstrip patch antenna for wide-angle radar, the microstrip patch antenna 10 includes: a PCB medium and a reference ground 101 integrated on the PCB medium, a rectangular normal radiation unit 102, a rectangular differential radiation unit 103, and a series feeding microstrip line 104; wherein,

[0044] The normal radiation unit 102, the differential radiation unit 103 and the series-fed microstrip line 104 are configured in a metal layer form and are spaced apart from the reference ground 101 on the same side of the reference ground 101 to form the microstrip patch antenna 10 with the reference ground 101;

[0045] The normal radiation unit 102 is connected in series with the differential radiation unit 103 via the series feeding microstrip line 104;

[0046] The normal radiation unit 102 has a feeding point 105, and the feeding point 105 is located on a normal radiation unit radiation edge 108a of the normal radiation unit 102 away from the differential radiation unit 103 (eg, Figure 2 shown);

[0047] The normal radiation unit 102 and the differential radiation unit 103 are located on the same central axis 107, and the series-fed microstrip line 104 is located on the central axis 107;

[0048] The normal radiation unit radiation edge 108a of the normal radiation unit 102 and the differential radiation unit radiation edge 109a of the differential radiation unit 103 are in a spatially vertical relationship;

[0049] The length L of the normal radiation unit non-radiation side 108b of the normal radiation unit 102 is N1 is r / 2, the length of the normal radiation unit radiation side 108a L R1 1.0L N1 ~1.5L N1 ,λ r is the wavelength of the electromagnetic wave propagating in the PCB medium at the antenna operating frequency;

[0050] The differential radiation unit 103 is divided into two mirror-image parts along the central axis 107, namely Figure 1 The length L of the non-radiating side 109b of the differential radiation unit of each part is N2 = L N1 , the length L of the radiation edge 109a of the differential radiation unit in each part R2 0.25L N2 ~0.5L N2 ;

[0051] The geometric center distance D between the normal radiation unit 102 and the differential radiation unit 103 is 0.4λ r ~0.6λ r .

[0052] like Figure 3 FIG. 1 is a diagram showing the distribution of the electromagnetic field polarization when the normal radiation unit 102 and the differential radiation unit 103 in the microstrip patch antenna for wide-angle radar of this embodiment radiate. When the electromagnetic wave signal is transmitted from the feeding point 105, the normal radiation unit 102 excites an electromagnetic field polarized in the horizontal direction, that is, Figure 3 The arrow A in the figure is the polarization direction of the electromagnetic field of the normal radiation unit 102. The horizontal polarization direction of the electromagnetic field is from one normal radiation unit radiation edge 108a of the normal radiation unit 102 to another normal radiation unit radiation edge 108a, and the differential radiation unit 103 excites an electromagnetic field polarized in the vertical direction, that is, Figure 3 Arrows B and C in FIG. 1 are the polarization directions of the electromagnetic field of the differential radiation unit 103 , and the phase difference between the polarization directions B and C of the electromagnetic field of the first part 103 a and the second part 103 b of the differential radiation unit 103 is 180°.

[0053] like Figure 4The figure shows the radiation pattern of the microstrip patch antenna for wide-angle radar of this embodiment along the vertical section, where the vertical section refers to the surface perpendicular to the surface of the microstrip patch antenna; the radiation pattern of the normal radiation unit 102 is a typical microstrip patch antenna radiation pattern ( Figure 4 The normal radiation unit pattern in FIG. 1 ), the differential radiation unit 103 is due to Figure 3 The first part 103a and the second part 103b of the two electromagnetic fields B and C with opposite polarization directions are composed, so the radiation pattern of the differential radiation unit 103 is a differential radiation pattern ( Figure 4 The total radiation pattern of the normal radiation unit 102 and the differential radiation unit 103 in the vertical section is the combined wide beam radiation pattern of the two ( Figure 4 ).

[0054] like Figure 5 The figure shows the radiation pattern of the microstrip patch antenna for wide-angle radar of this embodiment along the horizontal section, where the horizontal section refers to a plane parallel to the surface of the microstrip patch antenna; at this time, the radiation patterns of the normal radiation unit 102 and the differential radiation unit 103 are both typical microstrip patch antenna radiation patterns ( Figure 5 The normal radiation unit pattern and the differential radiation unit pattern in FIG. 1 are shown in FIG. 1 ), but since the geometric center distance D between the normal radiation unit 102 and the differential radiation unit 103 is 0.4λ r ~0.6λ r , so that the phase difference between the normal radiation unit 102 and the differential radiation unit 103 in the horizontal section is about 180°. Theoretically, the two should be synthesized to form a differential radiation pattern according to the cancellation effect, but the geometric center spacing D between the two is much smaller than the spacing of the conventional antenna array, and the normal radiation unit radiation side length L of the normal radiation unit 102 R1 Greater than the differential radiation unit radiation side length L of the differential radiation unit 103 R2 , so that the radiation power ratio of the normal radiation unit 102 and the differential radiation unit 103 is a non-uniform ratio of 1:1, so the total radiation pattern of the normal radiation unit 102 and the differential radiation unit 103 in the horizontal section is based on the wide beam radiation pattern between the normal radiation and the differential radiation ( Figure 5 ).

[0055] like Figure 6 The microstrip patch antenna for wide-angle radar according to the present embodiment is shown along the horizontal section ( Figure 6 horizontal plane) and vertical plane ( Figure 6 The actual radiation pattern of the vertical plane in the image is defined according to the common radar attenuation of 6dB. Figure 6It can be seen that the sensing angles in both horizontal and vertical sections achieve a wide-angle performance of ±80°.

[0056] like Figure 7 The figure shows a proportional comparison of the area of ​​the microstrip patch antenna for wide-angle radar of this embodiment and the traditional sum-difference beam array antenna. Figure 7 The left figure in FIG. 1 is a layout diagram of a microstrip patch antenna for wide-angle radar of this embodiment. Figure 7 The right figure in the figure is a layout diagram of a conventional sum-difference beam array antenna. Both can achieve a similar effect of a wide field of view, but in terms of the requirement for occupying an actual area, the area occupied by the microstrip patch antenna for wide-angle radar in this embodiment is 35% of the area occupied by the conventional sum-difference beam array antenna.

[0057] As described above, the microstrip patch antenna for wide-angle radar of the present embodiment has the characteristics of sum and difference beams, and the synthesized radiation angle has a wider wide-angle performance, and the radiation field angles in all directions are basically the same; at the same time, the size of the antenna is significantly reduced compared to the sum and difference array antenna, which is convenient for improving the integration of the radar; in addition, while the antenna size is significantly reduced, the antenna loss can also be significantly reduced and the antenna radiation efficiency can be improved; finally, the microstrip patch antenna for wide-angle radar of the present embodiment is a non-traditional array antenna, which will not affect the layout of the existing radar module, is easy to install, and is conducive to the application of radar in products.

[0058] As a preferred example, Figure 2 As shown, the geometric center distance D between the normal radiation unit 102 and the differential radiation unit 103 is 0.5λ r , when D = 0.5λ r When , the phase difference between the normal radiation unit 102 and the differential radiation unit 103 in the radiation direction on the horizontal section is 180°.

[0059] From the perspective of realizing the functional radiation of the microstrip antenna, it is not excessively restricted whether the normal radiation unit 102 and the differential radiation unit 103 are located on the same metal layer in the PCB medium, as long as the two units are located on the same side of the reference ground. In terms of radiation effect, it is better that the normal radiation unit 102 and the differential radiation unit 103 are located on the same metal layer on the PCB medium, so that the radiation loss of the two radiation units is relatively consistent; more preferably, the normal radiation unit 102 and the differential radiation unit 103 are located on the outermost metal layer on the PCB medium, so that the radiation loss of the two radiation units is relatively consistent while the radiation loss can be minimized, and the difficulty of the preparation process can be reduced, and the cost can be reduced. In addition, when the normal radiation unit 102 and the differential radiation unit 103 are located on different metal layers of the PCB medium, the two are electrically connected through conductive vias.

[0060] The material of the microstrip patch antenna of this embodiment can be any suitable antenna radiator material, such as silver, copper, nickel, tin, etc. As an example, in a PCB module, since the material of the metal layer is generally selected as copper material, the material of the antenna is also copper.

[0061] like Figure 8 and Fig.10 As shown, this embodiment also provides a wide-angle radar module, which includes: a radar chip 20, two identical microstrip patch antennas and a feeding network; wherein,

[0062] The two identical microstrip patch antennas are the microstrip patch antennas for wide-angle radar disclosed in this embodiment. The beneficial effects that can be achieved by the microstrip patch antenna can be found in the above description, and will not be repeated below.

[0063] One of the two microstrip patch antennas is used as a receiving antenna 21, and the other is used as a transmitting antenna 22;

[0064] The radar chip 20 is connected to the receiving antenna 21 and the transmitting antenna 22 through the feeding network to receive and send radio frequency signals respectively;

[0065] The radar chip 20 , the receiving antenna 21 , the transmitting antenna 22 and the feeding network are integrated on the same PCB medium 100 .

[0066] The microstrip patch antenna for wide-angle radar based on this embodiment has a wider wide-angle performance, and the radiation field angles in all directions are basically the same. Therefore, the receiving antenna 21 and the transmitting antenna 22 in the wide-angle radar module formed based on the microstrip patch antenna both have a wider wide-angle performance and the radiation field angles in all directions are basically the same.

[0067] As a specific example, the receiving antenna 21 and the transmitting antenna 22 share the same reference ground 101, and the normal radiation unit 102 and the differential radiation unit 103 of the receiving antenna 21 and the transmitting antenna 22 are both on the same side of the reference ground 101. Preferably, the normal radiation unit 102 and the differential radiation unit 103 of the receiving antenna 21 and the transmitting antenna 22 are located on the same metal layer on the PCB medium 100. Optimally, the normal radiation unit 102 and the differential radiation unit 103 of the receiving antenna 21 and the transmitting antenna 22 are located on the outermost metal layer on the PCB medium 100.

[0068] As another specific example, Figure 8 and Fig.10As shown, the radar chip 20 can be located on the same side of the PCB medium 100 as the receiving antenna 21 and the transmitting antenna 22. Of course, according to actual needs, the radar chip 20 can also be located on opposite sides of the PCB medium 100 as the receiving antenna 21 and the transmitting antenna 22, and electrically connected through conductive vias.

[0069] It should be noted that the specific structure of the feed network is conventionally selected according to actual needs, which is well known in the art and will not be elaborated here. The configuration can be independent of the radar chip 20 or integrated into the radar chip 20. The feed network described in this embodiment is an example of integration into the radar chip 20. The radar chip 20 is electrically connected to the receiving antenna 21 and the transmitting antenna 22 through the feed point feeding microstrip line 106 at the end of the feed network to achieve transmission and reception of antenna signals. In this embodiment, the radar chip 20 uses a 50Ω impedance feed point feeding microstrip line 106 to achieve electrical connection with the receiving antenna 21 and the transmitting antenna 22.

[0070] As an example, the receiving antenna 21 and the transmitting antenna 22 may be as follows: Figure 8 The 180° reverse setting shown can also be Fig.10 90° orthogonal setup shown.

[0071] When the antenna reference area is sufficient, the receiving antenna 21 and the transmitting antenna 22 may be selected as follows: Figure 8 180° reverse setting shown.

[0072] Another situation is that, in the actual radar module design, due to the need for miniaturization, the layout positions of the receiving antenna 21 and the transmitting antenna 22 will be close to the edge of the PCB medium. At this time, the reference ground area of ​​the antenna will be relatively insufficient. Fig. 9 As shown in FIG. 1 , when the receiving antenna 21 and the transmitting antenna 22 are set to a 180° reverse setting, the radiation pattern of the antenna will be distorted, and the horizontal field of view of the two antennas (the receiving antenna 21 and the transmitting antenna 22) is narrower than the vertical field of view, resulting in an enhanced asymmetry of the antenna radiation field in the horizontal and vertical planes. At this time, the receiving antenna 21 and the transmitting antenna 22 are set to a 90° orthogonal setting, as shown in FIG. Fig.11 As shown, in the radiation pattern of the antenna, along the horizontal or vertical plane, the field of view angles of the two antennas become a wide and narrow configuration, so the vertical and horizontal field of view angles of the radar pattern after fitting the transmitting antenna 22 and the receiving antenna 21 are restored to symmetry.

[0073] In summary, the utility model provides a microstrip patch antenna and a wide-angle radar module for wide-angle radar. The microstrip patch antenna for wide-angle radar has the characteristics of sum and difference beams, and the synthesized radiation angle has a wider wide-angle performance, and the radiation field angles in all directions are basically the same; at the same time, the size of the antenna is significantly reduced compared to the sum and difference array antenna, which is convenient for improving the integration of radar; in addition, while the antenna size is significantly reduced, the antenna loss can be significantly reduced and the antenna radiation efficiency can be improved; finally, the microstrip patch antenna for wide-angle radar is an antenna in a non-traditional array mode, which will not affect the layout of the existing radar module, is easy to install, and is conducive to the application of radar in products. Therefore, the utility model effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A microstrip patch antenna for wide-angle radar, characterized in that: The microstrip patch antenna comprises: a PCB medium and a reference ground integrated on the PCB medium, a rectangular normal radiation unit, a rectangular differential radiation unit, and a series-fed microstrip line; wherein, The normal radiating unit, the differential radiating unit and the series-fed microstrip line are arranged in a metal layer form and are spaced apart from the reference ground on the same side of the reference ground to form the microstrip patch antenna with the reference ground; The normal radiation unit is connected in series with the differential radiation unit through the series feeding microstrip line; The normal radiation unit has a feeding point, and the feeding point is located on a radiation edge of the normal radiation unit away from the differential radiation unit; The normal radiating unit and the differential radiating unit are located on the same central axis, and the series-fed microstrip line is located on the central axis; The normal radiation unit radiation side of the normal radiation unit and the differential radiation unit radiation side of the differential radiation unit are in a spatially vertical relationship; The length L of the non-radiating side of the normal radiation unit is N1 is r / 2, the length of the normal radiation unit radiation side L R1 1.0L N1 ~1.5L N1 ,λ r is the wavelength of the electromagnetic wave propagating in the PCB medium at the antenna operating frequency; The differential radiation unit is divided into two mirrored parts along the central axis, and the non-radiating side length L of the differential radiation unit in each part is N2 = L N1 , the radiation side length L of the differential radiation unit in each part R2 0.25L N2 ~0.5L N2 ; The geometric center distance D between the normal radiation unit and the differential radiation unit is 0.4λ r ~0.6λ r .

2. The microstrip patch antenna for wide-angle radar according to claim 1, characterized in that: The geometric center distance D between the normal radiation unit and the differential radiation unit is 0.5λ r .

3. The microstrip patch antenna for wide-angle radar according to claim 1, characterized in that: The normal radiation unit and the differential radiation unit are located on the same metal layer on the PCB medium.

4. The microstrip patch antenna for wide-angle radar according to claim 3, characterized in that: The normal radiation unit and the differential radiation unit are located on the outermost metal layer on the PCB medium.

5. A wide-angle radar module, characterized in that: The wide-angle radar module comprises: a radar chip, two identical microstrip patch antennas as claimed in any one of claims 1 to 4, and a feeding network; wherein, One of the two microstrip patch antennas is used as a receiving antenna, and the other is used as a transmitting antenna; The radar chip is connected to the receiving antenna and the transmitting antenna respectively through the feeding network to receive and send radio frequency signals respectively; The radar chip, the receiving antenna, the transmitting antenna and the feeding network are integrated on the same PCB medium.

6. The wide-angle radar module according to claim 5, characterized in that: The receiving antenna and the transmitting antenna share a same reference ground, and the normal radiation units and differential radiation units of the receiving antenna and the transmitting antenna are both on the same side of the reference ground.

7. The wide-angle radar module according to claim 6, characterized in that: The normal radiation unit and the differential radiation unit of the receiving antenna and the transmitting antenna are located on the same metal layer on the PCB medium.

8. The wide-angle radar module according to claim 7, characterized in that: The normal radiation unit and the differential radiation unit of the receiving antenna and the transmitting antenna are located on the outermost metal layer on the PCB medium.

9. The wide-angle radar module according to claim 5, characterized in that: The receiving antenna and the transmitting antenna are arranged 180 degrees in opposite directions.

10. The wide-angle radar module according to claim 5, characterized in that: The receiving antenna and the transmitting antenna are arranged to be orthogonal to each other at 90 degrees.

11. The wide-angle radar module according to claim 5, characterized in that: The radar chip and the two microstrip patch antennas are arranged on opposite sides of the PCB medium and are electrically connected through conductive vias.

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