A dual-beam microstrip array antenna and millimeter-wave radar

Abstract

The present invention discloses a dual-beam microstrip array antenna and millimeter-wave radar, which relate to the field of millimeter-wave radar. The dual-beam microstrip array antenna includes: a metal ground, a dielectric substrate and at least one antenna; wherein: the dielectric substrate is arranged above the metal ground; the antenna is arranged above the dielectric substrate, including a feeding point, a main feed line and n groups of radiation patch groups, wherein n is an integer greater than or equal to 2; each group of the radiation patch groups includes two radiation patches facing the same side, and adjacent radiation patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiation patches obtain a specific excitation phase and generate two symmetrical beams. Through the embodiments of the present invention, through the simple structure of the dual-beam microstrip array antenna, the design of the feeding network is greatly simplified, and the generated radiation does not deteriorate the antenna pattern, which significantly improves the radiation efficiency of the microstrip array antenna and can meet the needs of millimeter-wave radar.

Description

Technical Field

[0001] The present invention relates to the technical field of millimeter wave radars, and in particular to a dual-beam microstrip array antenna and a millimeter wave radar. Background Art

[0002] Microstrip array antennas have the advantages of low cost, ease of integration, and ease of achieving various beams, making them the main form of millimeter-wave radar antenna. In some application scenarios, millimeter-wave radar antennas are required to generate dual beams.

[0003] To achieve dual-beam transmission, traditional microstrip array antennas typically require complex feed networks to obtain appropriate amplitude and phase excitation. However, at millimeter-wave frequencies, the insertion loss introduced by these complex feed networks reduces the radiation efficiency of millimeter-wave radar antennas. The resulting radiation also degrades the antenna pattern, making it unsuitable for millimeter-wave radar applications. Summary of the Invention

[0004] The embodiments of the present invention aim to provide a dual-beam microstrip array antenna and millimeter-wave radar. The simple structure of the dual-beam microstrip array antenna greatly simplifies the design of the feed network, and the generated radiation does not deteriorate the antenna pattern, significantly improving the radiation efficiency of the microstrip array antenna and meeting the needs of millimeter-wave radar.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions: a dual-beam microstrip array antenna, comprising: a metal ground, a dielectric substrate, and at least one antenna; wherein:

[0006] The dielectric substrate is arranged to cover the metal ground;

[0007] The antenna is arranged above the dielectric substrate, and includes a feeding point, a main feed line and n groups of radiating patch groups, where n is an integer ≥ 2; each group of the radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams.

[0008] Optionally, the spacing between adjacent radiation patch groups is 2 medium wavelengths.

[0009] Optionally, the spacing between adjacent radiation patches is 0.5 medium wavelength.

[0010] Optionally, when the dual-beam microstrip array antenna includes multiple antennas, the dual-beam microstrip array antenna further includes: a power divider, the power divider and the multiple antennas form an antenna array, which is arranged above the dielectric substrate to generate two symmetrical beams.

[0011] Optionally, the power divider includes an input transmission line and several output transmission lines, the input transmission line receives external input signal power, divides the external input signal power into several output signal powers according to a certain ratio and outputs them to several output transmission lines; each output transmission line is connected to each antenna respectively.

[0012] Optionally, the feeding point is respectively connected to an output transmission line of the power divider and one end of the main feeder, for receiving the signal power output from an output transmission line of the power divider and transmitting it to the main feeder.

[0013] To solve the above technical problems, an embodiment of the present invention further provides the following technical solution: a millimeter-wave radar, comprising a dual-beam microstrip array antenna, wherein the dual-beam microstrip array antenna comprises: a metal ground, a dielectric substrate, and at least one antenna; wherein:

[0014] The dielectric substrate is arranged to cover the metal ground;

[0015] The antenna is arranged above the dielectric substrate, and includes a feeding point, a main feed line and n groups of radiating patch groups, where n is an integer ≥ 2; each group of the radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams.

[0016] Optionally, the spacing between adjacent radiation patch groups is 2 medium wavelengths, and the spacing between adjacent radiation patches is 0.5 medium wavelengths.

[0017] Optionally, when the dual-beam microstrip array antenna includes a plurality of antennas, the dual-beam microstrip array antenna further includes: a power divider, wherein the power divider and the plurality of antennas form an antenna array, which is arranged above the dielectric substrate and is used to generate two symmetrical beams;

[0018] The power divider includes an input transmission line and several output transmission lines. The input transmission line receives external input signal power and divides the external input signal power into several output signal powers according to a certain ratio and outputs them to several output transmission lines; each output transmission line is connected to each antenna respectively.

[0019] Optionally, the feeding point is respectively connected to an output transmission line of the power divider and one end of the main feeder, for receiving the signal power output from an output transmission line of the power divider and transmitting it to the main feeder.

[0020] Compared with the prior art, the embodiments of the present invention provide a dual-beam microstrip array antenna and millimeter-wave radar. The dual-beam microstrip array antenna includes a metal ground, a dielectric substrate, and at least one antenna. The dielectric substrate is arranged above the metal ground; the antenna is arranged above the dielectric substrate and includes a feed point, a main feed line, and n groups of radiating patches, where n is an integer greater than or equal to 2. Each group of radiating patches includes two radiating patches facing the same side, with adjacent radiating patch groups facing opposite directions and located on either side of the main feed line, respectively, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams. Thus, each group of radiating patches includes two radiating patches facing the same side, with adjacent radiating patch groups facing opposite directions and located on either side of the main feed line, respectively, so that the radiating patches obtain a specific excitation phase, enabling the antenna to generate dual beams. The simple structure greatly simplifies the design of the feed network, avoids a complex feed network, reduces feed network losses, and the generated radiation does not deteriorate the antenna pattern, significantly improving the radiation efficiency of the microstrip array antenna and meeting the requirements of millimeter-wave radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 This is a structural diagram of a dual-beam microstrip array antenna provided by the present invention;

[0023] Figure 2 This is a schematic structural diagram of an antenna in a dual-beam microstrip array antenna provided by the present invention;

[0024] Figure 3 This is a schematic structural diagram of a radiation patch group of an antenna in a dual-beam microstrip array antenna provided by the present invention;

[0025] Figure 4 This is a schematic structural diagram of a radiation patch group of an antenna in a dual-beam microstrip array antenna provided by the present invention;

[0026] Figure 5 Schematic diagram of the reflection coefficient in a dual-beam microstrip array antenna provided by the present invention;

[0027] Figure 6 This is a schematic diagram of a dual-beam microstrip array antenna provided by the present invention generating two symmetrical beams;

[0028] Figure 7This is a schematic structural diagram of a dual-beam microstrip array antenna provided by the present invention, in which a power divider and several antennas form an antenna array;

[0029] Figure 8 Schematic diagram of the reflection coefficient in a dual-beam microstrip array antenna provided by the present invention;

[0030] Figure 9 This is another schematic diagram of a dual-beam microstrip array antenna provided by the present invention generating two symmetrical beams;

[0031] Figure 10 It is a structural schematic diagram of a millimeter wave radar provided by the present invention.

[0032] Reference numerals:

[0033] Dual-beam microstrip array antenna 1 Metal ground 11

[0034] Dielectric substrate 12 Antenna 13

[0035] Feeding point 131 Main feeder 132

[0036] Radiating patch group 133 Radiating patch 1331

[0037] Power divider 14 DETAILED DESCRIPTION

[0038] For ease of understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this invention belongs. The terms used in this specification and in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0040] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] An antenna is a device used to transmit and receive electromagnetic energy. In many cases, a single antenna can accomplish both tasks. However, once an antenna is designed, its radiation characteristics are fixed, making it unsuitable for some applications, such as narrow beamwidths and electronically scanned beams. In these cases, multiple antennas must be combined to form an array antenna to achieve the desired performance.

[0042] Array antennas utilize the principles of interference and superposition of electromagnetic waves to produce unique radiation characteristics. The individual radiators that make up an array antenna are called elements. By varying the phase of the excitation current for each element antenna in the array, the radiation pattern can be scanned across space. For this reason, this type of array is called a phased array and is widely used in radar.

[0043] Array antennas are classified into linear arrays, planar arrays, and conformal arrays (where the elements conform to a non-planar surface). If each element is assumed to be isotropic, the resulting pattern is called the array factor.

[0044] Microstrip array antennas are a type of array antenna. They are low-cost, easy to integrate, and easy to implement various beams, making them the primary form of millimeter-wave radar antenna. In some applications, millimeter-wave radar antennas are required to generate dual beams.

[0045] Traditional microstrip array antennas typically require complex feed networks to achieve appropriate amplitude and phase excitation in order to achieve dual beams. However, in the millimeter wave frequency band, the insertion loss introduced by this complex feed network reduces the radiation efficiency of the millimeter wave radar antenna. The resulting radiation also degrades the antenna pattern, making it unable to meet the requirements of millimeter wave radar.

[0046] In view of this, the present invention provides a dual-beam microstrip array antenna, comprising a metal ground, a dielectric substrate, and at least one antenna; wherein: the dielectric substrate is arranged above the metal ground; the antenna is arranged above the dielectric substrate and comprises a feed point, a main feed line, and a plurality of radiating patch groups; the feed point is connected to one end of the main feed line, receives external input signal power, and transmits it to the main feed line; each group of radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams. Thus, through the simple structure of the dual-beam microstrip array antenna, the design of the feeding network is greatly simplified, and the generated radiation does not deteriorate the antenna pattern, significantly improving the radiation efficiency of the microstrip array antenna, which can meet the requirements of millimeter-wave radar.

[0047] In order to facilitate understanding of the above inventive concept of the present invention, the above inventive concept of the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments.

[0048] In one embodiment, Figures 1 to 3 As shown, the present invention provides a dual-beam microstrip array antenna, wherein the dual-beam microstrip array antenna 1 comprises: a metal ground 11, a dielectric substrate 12 and at least one antenna 13; wherein:

[0049] The dielectric substrate 12 is disposed over the metal ground 11;

[0050] The antenna 13 is arranged above the dielectric substrate 12, and includes: a feeding point 131, a main feed line 132 and several groups of radiating patch groups 133, where n is an integer ≥ 2; each group of the radiating patch groups 133 includes two radiating patches facing the same side, and adjacent radiating patch groups 133 face opposite directions and are respectively located on both sides of the main feed line 132, so that the radiating patches 1331 obtain a specific excitation phase and generate two symmetrical beams.

[0051] In this embodiment, a dual-beam microstrip array antenna includes a metal ground, a dielectric substrate, and at least one antenna; wherein: the dielectric substrate is arranged above the metal ground; the antenna is arranged above the dielectric substrate and includes a feed point, a main feed line, and n groups of radiating patch groups, wherein n is an integer greater than or equal to 2; each group of the radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams. Thus, by each group of the radiating patch groups including two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase, the antenna can generate dual beams, and has a simple structure, greatly simplifies the design of the feeding network, avoids a complex feeding network, reduces feeding network losses, and the generated radiation does not deteriorate the antenna pattern, significantly improving the radiation efficiency of the microstrip array antenna and meeting the requirements of millimeter-wave radar.

[0052] In one embodiment, Figure 2 As shown, the antenna 13 includes n groups of radiation patch groups 133 , and the distance between adjacent radiation patch groups 133 is 2 medium wavelengths.

[0053] The radiation patch group 133 includes two radiation patches 1331 facing the same side, and the distance between adjacent radiation patches 1331 is 0.5 medium wavelength.

[0054] Preferably, if Figure 2 and Figure 3 As shown, the antenna 13 includes 10 groups of radiation patch groups 133, each group of the radiation patch group 133 includes two radiation patches 1331 facing the same side, and adjacent radiation patch groups 133 face opposite directions and are respectively located on both sides of the main feed line 132, so that the radiation patches 1331 obtain a specific excitation phase and generate two symmetrical beams.

[0055] As an example, Figure 4As shown, the antenna 13 includes two groups of radiation patch groups, namely radiation patch group 133A and radiation patch group 133B. The radiation patch group 133A includes two radiation patches, namely radiation patch 1331a and radiation patch 1331b. The radiation patch group 133B includes two radiation patches, namely radiation patch 1331c and radiation patch 1331d. The spacing between adjacent radiation patches is 0.5 medium wavelength; wherein, the radiation patch 1331a and the radiation patch 1331b of the radiation patch group 133A are facing the same side, and the radiation patch 1331c and the radiation patch 1331d of the radiation patch group 133B are facing the same side; the radiation patch group 133A and the radiation patch group 133B are facing opposite directions and are respectively located on both sides of the main feed line 132, so that the radiation patch 1331a and the radiation patch 1331b of the radiation patch group 133A obtain a specific excitation phase to generate a beam, and the radiation patch 1331c and the radiation patch 1331d of the radiation patch group 133B obtain a specific excitation phase to generate another beam, and the two beams are symmetrical.

[0056] Specifically, taking the example where the antenna 13 includes 10 groups of radiation patch groups 133 , each group of radiation patch groups 133 including 2 radiation patches 1331 , the technical solution of a dual-beam microstrip array antenna provided by the present invention is further described in detail.

[0057] In this embodiment, the dielectric substrate 12 is Rogers Ro3003G2, the thickness of the dielectric substrate 12 is 0.127 mm, and the copper coating thickness is 0.5 oz; the radiation patch spacing d of the antenna 13 is 1.33 mm, and the radiation patch length is 1.24 mm.

[0058] A dual-beam microstrip array antenna, wherein the dielectric substrate 12 is arranged above the metal ground 11; the antenna 13 is arranged above the dielectric substrate 12 and includes 10 groups of radiating patch groups 133, each group of the radiating patch groups 133 includes two radiating patches 1331 facing the same side, and adjacent radiating patch groups 133 face opposite directions and are respectively located on both sides of the main feed line 132, so that the radiating patches 1331 obtain a specific excitation phase and generate two symmetrical beams.

[0059] In this embodiment, since the spacing between adjacent radiation patches 1331 is half a medium wavelength, the excitation phases of the 20 (2*10) radiation patches are respectively:

[0060] [0, π, π, 0, 0, π, π, 0, 0, π, π, 0, 0, π, π, 0, 0, π, π, 0].

[0061] According to the array factor calculation formula:

[0062]

[0063] In the above formula, f a (θ) is the array factor pattern, a m is the excitation amplitude of the array element, is the excitation phase of the array element, M is the number of array elements, k is the propagation constant in air, and d is the distance between array elements.

[0064] In this embodiment:

[0065] a m =[1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1]

[0066]

[0067] M=20

[0068] k=2π / λ,λ=3.92mm

[0069] d=1.33mm

[0070] According to the array factor calculation formula, the antenna 13 generates two symmetrical beams. The beam pointing estimation formula T is:

[0071] T=±arcsin(0.25λ / d)

[0072] In the above formula, T is the beam pointing angle, λ is the wavelength of air, and d is the spacing between the radiating patches (i.e., the spacing between array elements).

[0073] In this embodiment, the air wavelength λ=3.92 mm, d=1.33 mm, and substituting them into the above-mentioned beam pointing estimation formula T, the beam pointing angle T=47.5 degrees is obtained.

[0074] In this embodiment, a dual-beam microstrip array antenna according to an embodiment of the present invention is used, and the reflection coefficient is as follows: Figure 5 As shown, the state in which two symmetrical beams are generated is as follows Figure 6 shown.

[0075] from Figure 5 and Figure 6 It can be seen from the figure that, using a dual-beam microstrip array antenna according to an embodiment of the present invention, the reflection coefficient of the array antenna and the two beams generated are both symmetrical.

[0076] In this embodiment, the antenna includes n groups of radiating patch groups, each of which includes two radiating patches facing the same side, with adjacent radiating patch groups facing opposite directions and located on either side of the main feeder, respectively, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams. Thus, by having each group of radiating patch groups include two radiating patches facing the same side, with adjacent radiating patch groups facing opposite directions and located on either side of the main feeder, respectively, the radiating patches obtain a specific excitation phase, enabling the antenna to generate dual beams. This simple structure significantly simplifies the design of the feed network, avoids a complex feed network, reduces feed network losses, and generates radiation without deteriorating the antenna pattern. This significantly improves the radiation efficiency of the microstrip array antenna, meeting the requirements of millimeter-wave radar.

[0077] In one embodiment, Figure 7 As shown, when the dual-beam microstrip array antenna 1 includes multiple (two or more) antennas 13, the dual-beam microstrip array antenna 1 also includes a power divider 14. The power divider 14 and the multiple antennas 13 form an antenna array, which is disposed above the dielectric substrate 12 and is used to generate two symmetrical beams. The power divider 14 includes an input transmission line and multiple output transmission lines. The input transmission line receives external input signal power and divides the external input signal power into multiple output signal powers according to a certain ratio, which are output to the multiple output transmission lines. Each output transmission line is connected to each antenna 13.

[0078] The feeding point 131 is respectively connected to an output transmission line of the power divider 14 and one end of the main feeder 132 , and is used to receive the signal power output from an output transmission line of the power divider 14 and transmit it to the main feeder 132 .

[0079] In this embodiment, a dual-beam microstrip array antenna composed of a power divider 14 and a plurality of antennas 13 is used as an antenna array according to an embodiment of the present invention. The reflection coefficient is as follows: Figure 8 As shown, the state in which two symmetrical beams are generated is as follows Figure 9 shown.

[0080] from Figure 8 and Figure 9 It can be seen from the figure that, using a dual-beam microstrip array antenna according to an embodiment of the present invention, the reflection coefficient of the array antenna and the two beams generated are both symmetrical.

[0081] Based on the same concept, in one embodiment, Figure 10 As shown, the present invention provides a millimeter wave radar, which includes the dual-beam microstrip array antenna 1 described in any of the above embodiments.

[0082] In this embodiment, the dual-beam microstrip array antenna 1 is consistent with the dual-beam microstrip array antenna 1 described in any of the above embodiments. The specific structure and function can refer to the dual-beam microstrip array antenna 1 described in any of the above embodiments, and will not be repeated here.

[0083] In this embodiment, the millimeter-wave radar includes a dual-beam microstrip array antenna, which includes at least one antenna. The antenna includes n groups of radiating patch groups, where n is an integer greater than or equal to 2. Each group of radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are located on either side of the main feeder, respectively. This allows the radiating patches to obtain a specific excitation phase and generate two symmetrical beams. Thus, by having each group of radiating patch groups include two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are located on either side of the main feeder, respectively, the radiating patches obtain a specific excitation phase, enabling the antenna to generate dual beams. This simple structure significantly simplifies the design of the feed network, avoids a complex feed network, reduces feed network losses, and generates radiation without deteriorating the antenna pattern. This significantly improves the radiation efficiency of the microstrip array antenna and can meet the requirements of millimeter-wave radars.

[0084] It should be noted that the above-mentioned millimeter-wave radar embodiment and the dual-beam microstrip array antenna embodiment belong to the same concept. The specific implementation process is detailed in the dual-beam microstrip array antenna embodiment, and the technical features of the dual-beam microstrip array antenna embodiment are correspondingly applicable in the millimeter-wave radar embodiment, which will not be repeated here.

[0085] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-beam microstrip array antenna, characterized in that: The dual-beam microstrip array antenna includes: a metal ground, a dielectric substrate and at least one antenna; wherein: The dielectric substrate is arranged to cover the metal ground; The antenna is arranged above the dielectric substrate, and includes a feeding point, a main feed line and n groups of radiating patch groups, where n is an integer ≥ 2; the feeding point is located at one end of the main feed line, each group of the radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams.

2. The dual-beam microstrip array antenna according to claim 1, characterized in that: The distance between adjacent radiation patch groups is 2 medium wavelengths.

3. The dual-beam microstrip array antenna according to claim 1, wherein: The distance between adjacent radiation patches is 0.5 medium wavelength.

4. The dual-beam microstrip array antenna according to claim 1, wherein: When the dual-beam microstrip array antenna includes a plurality of antennas, the dual-beam microstrip array antenna further includes: a power divider, wherein the power divider and the plurality of antennas form an antenna array, which is arranged above the dielectric substrate and is used to generate two symmetrical beams.

5. The dual-beam microstrip array antenna according to claim 4, characterized in that: The power divider includes an input transmission line and several output transmission lines. The input transmission line receives external input signal power and divides the external input signal power into several output signal powers according to a certain ratio and outputs them to several output transmission lines; each output transmission line is connected to each antenna respectively.

6. The dual-beam microstrip array antenna according to claim 5, characterized in that: The feeding point is respectively connected to an output transmission line of the power divider and one end of the main feeder, and is used to receive the signal power output from an output transmission line of the power divider and transmit it to the main feeder.

7. A millimeter wave radar, characterized in that: The millimeter wave radar includes a dual-beam microstrip array antenna, which includes: a metal ground, a dielectric substrate and at least one antenna; wherein: The dielectric substrate is arranged to cover the metal ground; The antenna is arranged above the dielectric substrate, and includes a feeding point, a main feed line and n groups of radiating patch groups, where n is an integer ≥ 2; the feeding point is located at one end of the main feed line, each group of the radiating patch groups includes two radiating patches facing the same side, and adjacent radiating patch groups face opposite directions and are respectively located on both sides of the main feed line, so that the radiating patches obtain a specific excitation phase and generate two symmetrical beams.

8. The millimeter wave radar according to claim 7, characterized in that The spacing between adjacent radiation patch groups is 2 medium wavelengths, and the spacing between adjacent radiation patches is 0.5 medium wavelengths.

9. The millimeter wave radar according to claim 7, characterized in that When the dual-beam microstrip array antenna includes a plurality of antennas, the dual-beam microstrip array antenna further includes: a power divider, wherein the power divider and the plurality of antennas form an antenna array, which is arranged above the dielectric substrate and is used to generate two symmetrical beams; The power divider includes an input transmission line and several output transmission lines. The input transmission line receives external input signal power and divides the external input signal power into several output signal powers according to a certain ratio and outputs them to several output transmission lines; each output transmission line is connected to each antenna respectively.

10. The millimeter wave radar according to claim 9, characterized in that: The feeding point is respectively connected to an output transmission line of the power divider and one end of the main feeder, and is used to receive the signal power output from an output transmission line of the power divider and transmit it to the main feeder.

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