A coupled feeder array antenna, a coupled feeder planar array antenna, a radar, and a vehicle

Abstract

The present invention relates to the technical field of antenna design, and particularly to a coupled-feed linear array antenna, a coupled-feed planar array antenna, a radar, and a vehicle. The coupled-feed linear array antenna includes a substrate, a main radiation unit, a main feeder, auxiliary radiation units, and auxiliary feeders. One end of the main feeder is connected to the main radiation unit, and the other end of the main feeder is connected to an antenna port. Along the second direction, the two auxiliary radiation units are symmetrically arranged on both sides of the main radiation unit. Along the second direction, the two auxiliary feeders are symmetrically arranged on both sides of the main radiation unit. The auxiliary feeder includes a first section and a second section. The first section is arranged adjacent to the main radiation unit, and there is a gap between the first section and the main radiation unit. The second section is connected to the first section and the auxiliary radiation unit. By adopting the coupled-feed method, the phase distribution can be adjusted by adjusting the length of the auxiliary feeder, and the amplitude distribution can be adjusted by adjusting the gap between the auxiliary feeder and the main radiation unit, thus simplifying the design process.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna design, and particularly to a coupled-feed linear array antenna, a coupled-feed planar array antenna, a radar, and a vehicle. Background Art

[0002] Due to its characteristics of low profile, low cost, easy integration, and easy realization of various beams, microstrip antennas are widely used in various vehicle-mounted radars. Among them, an array antenna needs to excite microstrip patch radiation units according to a certain amplitude and phase distribution to obtain a desired radiation pattern. The radiated electromagnetic field of the array antenna is the sum (vector sum) of the radiation fields of each unit constituting the antenna array. Since the positions of each unit and the amplitude and phase of the feeding current can be adjusted independently, the array antenna has various different functions that cannot be achieved by a single antenna.

[0003] Traditional feeding networks are directly connected to radiation units through microstrip lines. However, when encountering a large amplitude distribution ratio, or when amplitude and phase need to be adjusted simultaneously, the design of traditional feeding networks becomes complicated. A too-narrow microstrip line will cause difficulties in processing, and a too-wide microstrip line will generate radiation, thereby reducing the radiation performance of the antenna. Summary of the Invention

[0004] Embodiments of the present invention provide a coupled-feed linear array antenna, a coupled-feed planar array antenna, a radar, and a vehicle, aiming to solve the problems of complicated feeding network design and difficult processing when the amplitude distribution ratio in a microstrip antenna is large, or when amplitude and phase need to be adjusted simultaneously.

[0005] To solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: providing a coupled-feed linear array antenna, where the coupled-feed linear array antenna includes a substrate, a main radiation unit, a main feeder, auxiliary radiation units, and auxiliary feeders; wherein, the normal line of the substrate is parallel to a first direction; the main radiation unit is disposed on a first surface of the substrate; the main feeder is disposed on the first surface of the substrate, one end of the main feeder is connected to the main radiation unit, and the other end of the main feeder is connected to an antenna port; the auxiliary radiation units are disposed on the first surface of the substrate, and along a second direction, the two auxiliary radiation units are symmetrically disposed on both sides of the main radiation unit; the auxiliary feeders are disposed on the first surface of the substrate, and along the second direction, the two auxiliary feeders are symmetrically disposed on both sides of the main radiation unit. The auxiliary feeder includes a first section and a second section. The first section is disposed adjacent to the main radiation unit, there is a gap between the first section and the main radiation unit, and the second section is connected to the first section and the auxiliary radiation unit; the first direction is perpendicular to the second direction.

[0006] In some embodiments, the main radiation unit includes a first side and a second side that are oppositely disposed in the second direction, and both the first side and the second side are perpendicular to the second direction.

[0007] In some embodiments, the first section is parallel to the first side or the second side.

[0008] In some embodiments, the auxiliary feeder further includes a third section. The second section is connected to the auxiliary radiation unit through the third section. The third section is parallel to the first section, and the second section is perpendicular to the first section.

[0009] In some embodiments, the connection between the second section and the first section is provided with a rounded corner, and the connection between the second section and the third section is provided with a rounded corner.

[0010] In some embodiments, the main radiation unit includes a third side parallel to the second direction. Two first protrusions are spaced and protrudingly provided on the third side, and the main feeder is connected to the third side and is located between the two first protrusions.

[0011] In some embodiments, the auxiliary radiation unit includes a fourth side parallel to the second direction. Two second protrusions are spaced and protrudingly provided on the fourth side, and the second section is connected to the fourth side and is located between the two second protrusions.

[0012] To solve the above technical problems, another technical solution adopted in the embodiments of the present invention is: to provide a coupled-feed planar array antenna, which includes a plurality of the above-mentioned coupled-feed linear array antennas, and the plurality of coupled-feed linear array antennas are arranged at intervals in the same plane.

[0013] To solve the above technical problems, yet another technical solution adopted in the embodiments of the present invention is: to provide a radar, which includes the above-mentioned coupled-feed linear array antenna.

[0014] To solve the above technical problems, still another technical solution adopted in the embodiments of the present invention is: to provide a vehicle, which includes the above-mentioned radar.

[0015] Different from the related art, the coupled-feed linear array antenna, the coupled-feed planar array antenna, the radar and the vehicle provided in the embodiments of the present invention, by adopting the coupled-feed method, can adjust the delay amount, that is, the excitation phase distribution, by adjusting the length of the auxiliary feeder, and can adjust the coupling amount, that is, the excitation amplitude distribution, by adjusting the gap between the auxiliary feeder and the main radiation unit, thereby simplifying the design process of the feed network, reducing the loss of the feed network, and reducing the processing difficulty and improving the radiation performance of the array antenna. Description of the Drawings

[0016] One or more embodiments are illustrated by way of example in the corresponding drawings, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the figures in the drawings do not constitute a scale limitation.

[0017] Figure 1 is a schematic structural diagram of a coupled feeder array antenna according to an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of an antenna body of a coupled feeder array antenna according to an embodiment of the present invention;

[0019] Figure 3 is Figure 2 a schematic structural diagram of the main radiation unit and the main feeder in

[0020] Figure 4 is Figure 2 a schematic structural diagram of the auxiliary radiation unit and the auxiliary feeder in

[0021] Figure 5 is a reflection coefficient diagram of a coupled feeder array antenna according to an embodiment of the present invention;

[0022] Figure 6 is an H-plane radiation pattern of a coupled feeder array antenna according to an embodiment of the present invention;

[0023] Figure 7 is a schematic structural diagram of an antenna body of a coupled feeder array antenna according to another embodiment of the present invention;

[0024] Figure 8 is Figure 7 the H-plane radiation pattern of the coupled feeder array antenna in

[0025] The reference numerals in the specific embodiments are as follows:

[0026] 100, coupled feeder array antenna;

[0027] 1, substrate;

[0028] 2, antenna body;

[0029] 3, main radiation unit; 31, first side; 32, second side; 33, third side; 34, first protrusion;

[0030] 4, main feeder;

[0031] 5, auxiliary radiation unit; 51, fourth side; 52, second protrusion;

[0032] 6, auxiliary feeder; 61, first segment; 62, second segment; 63, third segment;

[0033] 7. Metal layer. Detailed implementation manners

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that if there is no conflict, the various features in the embodiments of the present invention can be combined with each other and are all within the protection scope of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical sequence is shown in the flowchart, in some cases, the steps shown or described can be executed in a different module division from that in the device schematic diagram or a different sequence from that in the flowchart.

[0036] Unless otherwise defined, all the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific implementation manners and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0037] An array antenna is a radiation system composed of multiple radiation units with the same form and arranged according to a certain rule, and the radiation unit can be called an array element. According to the arrangement manner of the array elements, the array antenna can be divided into a linear array antenna, a planar array antenna and a three-dimensional array antenna.

[0038] A microstrip antenna array generally feeds each radiation unit through a feeding network composed of microstrip lines. According to the common feeding methods, the microstrip antenna array can be divided into parallel feeding and series feeding. In order to meet the specific requirements of antenna gain, sidelobe level and efficiency, the antenna array requires an appropriate amplitude and phase distribution, which makes the design of the microstrip antenna array very complicated, especially in the case of high-frequency applications. This phenomenon is particularly prominent. And because the excitation, radiation and mutual coupling of the units in the microstrip antenna are intertwined with each other, it is difficult to accurately design and realize the amplitude and phase distribution requirements of each unit in the antenna array. Especially when the number of array elements is large, the design parameters increase exponentially and the design becomes more and more difficult.

[0039] Such as Figure 1 and Figure 2As shown in the figure, to solve the above technical problems, an embodiment of the present invention provides a coupled feed linear array antenna 100. The coupled feed linear array antenna 100 includes a substrate 1 and an antenna body 2. The antenna body 2 includes a main radiation unit 3, a main feeder 4, an auxiliary radiation unit 5, and an auxiliary feeder 6. The substrate 1 is used to carry the main radiation unit 3, the main feeder 4, the auxiliary radiation unit 5, and the auxiliary feeder 6. The main radiation unit 3, the main feeder 4, the auxiliary radiation unit 5, and the auxiliary feeder 6 are disposed on the first surface of the substrate 1. The main radiation unit 3 and the auxiliary radiation unit 5 are used to transform the guided wave into an electromagnetic wave propagating in an unbounded medium (usually free space), or perform the opposite transformation. The main radiation unit 3 and the auxiliary radiation unit 5 are array elements. The main feeder 4 and the auxiliary feeder 6 are paths connecting the antenna ports and the array units, realizing functions such as impedance matching, amplitude and phase distribution, etc. The main feeder 4 is used to connect the main radiation unit 3 with the antenna port. The auxiliary feeder 6 is used to couple with the main radiation unit 3 and connect with the auxiliary radiation unit 5.

[0040] Coupling refers to a way of power transfer between microstrip patches without direct contact. When two patches are arranged along the H-plane, it is called H-plane arrangement. When two patches are arranged along the E-plane, it is called E-plane arrangement. When the distance between two patches is small, the E-plane arrangement shows very small coupling. When the distance between two patches is large, the H-plane arrangement shows very small coupling.

[0041] Among them, the plane parallel to the electric field direction is called the E-plane, and the plane perpendicular to the electric field direction is called the H-plane.

[0042] For the above substrate 1, the normal line of the substrate 1 is parallel to the first direction. The material and thickness of the substrate 1 have a great influence on the coupled feed linear array antenna 100. Among them, the material affects the dielectric constant. Materials with relatively small dielectric constants can enhance the edge field at the radiation gap and can also increase the antenna bandwidth. For the thickness of the substrate 1, the antenna bandwidth will increase with the increase of h / λ, but the corresponding loss will also increase, resulting in a decrease in efficiency. When h is too small, it will also affect the antenna bandwidth and reduce the radiation efficiency. Among them, h is the substrate thickness, and λ is the dielectric wavelength. Optionally, the substrate 1 is Rogers Ro3003G2, the thickness of the substrate 1 is 0.127 mm, and the copper plating thickness is 0.5 oz. Among them, Rogers Ro3003G2 is a kind of high-frequency ceramic-filled polytetrafluoroethylene laminate, which is designed specifically for millimeter-wave automotive radar applications according to industry requirements. Its dielectric constants at 10 GHz and 77 GHz are 3.00 (clamped stripline method) and 3.07 (microstrip line differential phase method), and it has extremely low losses.

[0043] Such as Figure 2 AndFigure 3 As shown in the figure, for the above-mentioned main radiation unit 3, the main radiation unit 3 includes a first side 31 and a second side 32 that are oppositely arranged in the second direction, and both the first side 31 and the second side 32 are perpendicular to the second direction. By making the first side 31 and the second side 32 parallel to each other, it is convenient for the processing of the main radiation unit 3 and for controlling the distance from the auxiliary feeder 6. Optionally, the patch length of the main radiation unit 3 is 1.153 mm and the width is 1 mm. Among them, the first direction is perpendicular to the second direction.

[0044] As Figure 3 shown in the figure, the main radiation unit 3 includes a third side 33 parallel to the second direction, and two first protrusions 34 are spaced and protruded on the third side 33, and the main feeder 4 is connected to the third side 33 and is located between the two first protrusions 34. By providing the first protrusions 34, the main feeder 4 is connected to the main radiation unit 3 in an embedded feeding form, thereby reducing the input impedance. Optionally, the embedding length of the main radiation unit 3 is 0.406 mm.

[0045] As Figure 2 and Figure 3 shown in the figure, for the above-mentioned main feeder 4, one end of the main feeder 4 is connected to the main radiation unit 3, and the other end of the main feeder 4 is connected to the antenna port. By adjusting the main feeder 4 and the auxiliary feeder 6, the matching of the antenna can be adjusted. Optionally, the width of the main feeder 4 is 0.3 mm.

[0046] As Figure 2 and Figure 4 shown in the figure, for the above-mentioned auxiliary radiation unit 5, along the second direction, the two auxiliary radiation units 5 are symmetrically arranged on both sides of the main radiation unit 3. The auxiliary radiation units 5 are symmetrically arranged on both sides of the main radiation unit 3, and the three are evenly spaced and arranged in a linear array. Optionally, the distance between the main radiation unit 3 and the auxiliary radiation unit 5 is 2 mm, the distance between the main radiation units 3 is 2 mm, and the distance between the auxiliary radiation units 5 is 2 mm. Optionally, the patch length of the auxiliary radiation unit 5 is 1.113 mm and the width is 1 mm.

[0047] As Figure 4 shown in the figure, the auxiliary radiation unit 5 includes a fourth side 51 parallel to the second direction, and two second protrusions 52 are spaced and protruded on the fourth side 51, and the second section 62 is connected to the fourth side 51 and is located between the two second protrusions 52. By providing the second protrusions 52, the auxiliary feeder 6 is connected to the auxiliary radiation unit 5 in an embedded feeding form, thereby reducing the input impedance. Optionally, the embedding length of the auxiliary radiation unit 5 is 0.424 mm.

[0048] As Figure 2 and Figure 4 shown, for the above-mentioned auxiliary feeder 6, along the second direction, the two auxiliary feeders 6 are symmetrically arranged on both sides of the main radiation unit 3. The auxiliary feeder 6 includes a first section 61 and a second section 62. The first section 61 is arranged adjacent to the main radiation unit 3, and there is a gap between the first section 61 and the main radiation unit 3. The second section 62 is connected to the first section 61 and the auxiliary radiation unit 5. By making the first section 61 adjacent to the main radiation unit 3, coupling is generated between the first section 61 and the main radiation unit 3, thereby transmitting power. The second section 62 connects the auxiliary radiation unit 5 and the first section 61, thereby transmitting the radiation power to the auxiliary radiation unit 5. Optionally, the width of the auxiliary feeder 6 is 0.3 mm. Optionally, the total length of the auxiliary feeder 6 is 3.36 mm.

[0049] The excitation of the radiation unit is determined by the radiation power of each radiation unit. The magnitude of the excitation amplitude of the radiation unit depends on its own radiation power. By adjusting the distance between the first section 61 and the main radiation unit 3, the coupling amount between the two can be adjusted, that is, the magnitude of the excitation amplitude of the radiation unit can be adjusted.

[0050] The phase of the radiation unit can be changed by the insertion phase of the radiation unit and the feeder. By changing the length of the feeder, the delay amount between the auxiliary radiation unit 5 and the main radiation unit 3 can be changed, that is, the excitation phase distribution. According to the electrical lengths of the radiation unit and the feeder, the phase of the auxiliary radiation unit 5 can be calculated.

[0051] As Figure 2 and Figure 4 shown, the first section 61 is parallel to the first side 31 or the second side 32. By making the first section 61 parallel to the first side 31 or the second side 32, it is convenient for the processing of the auxiliary feeder 6 and for adjusting the distance from the main radiation unit 3.

[0052] As Figure 4 shown, in some embodiments, the auxiliary feeder 6 further includes a third section 63. The second section 62 is connected to the auxiliary radiation unit 5 through the third section 63. The third section 63 is parallel to the first section 61, and the second section 62 is perpendicular to the first section 61. By arranging the vertically connected first section 61, second section 62, and third section 63 in an orderly manner, it is convenient for processing and calculating the length.

[0053] As Figure 4As shown, the connection between the second section 62 and the third section 63 is provided with a chamfer. In some embodiments, the connection between the second section 62 and the first section 61 is provided with a fillet, and the connection between the second section 62 and the third section 63 is provided with a fillet. By changing the right angle at the corner of the auxiliary feeder 6 to a fillet transition, the cross-sectional change of the signal transmission path on the auxiliary feeder 6 can be made uniform, improving the impedance.

[0054] As Figure 1 shown, the coupled feeder array antenna 100 further includes a metal layer 7, and the metal layer 7 is disposed on the second surface of the substrate 1, and the second surface is disposed opposite to the first surface. The metal layer 7 is used for reflecting electromagnetic waves. Optionally, the metal layer 7 is a copper sheet.

[0055] The coupled feeder array antenna 100 of the embodiment of the present invention is experimentally verified, and the test data of the coupled feeder array antenna 100 are as follows:

[0056] The coupled feeder array antenna 100 includes a substrate 1 and an antenna body 2. The antenna body 2 includes a main radiation unit 3, a main feeder 4, an auxiliary radiation unit 5, and an auxiliary feeder 6; the main radiation unit 3, the main feeder 4, the auxiliary radiation unit 5, and the auxiliary feeder 6 are disposed on the first surface of the substrate 1; one end of the main feeder 4 is connected to the main radiation unit 3, and the other end of the main feeder 4 is connected to an antenna port; along the second direction, the two auxiliary radiation units 5 are symmetrically disposed on both sides of the main radiation unit 3; along the second direction, the two auxiliary feeders 6 are symmetrically disposed on both sides of the main radiation unit 3. The auxiliary feeder 6 includes a first section 61 and a second section 62. The first section 61 is disposed adjacent to the main radiation unit 3, and there is a gap between the first section 61 and the main radiation unit 3. The second section 62 is connected to the first section 61 and the auxiliary radiation unit 5;

[0057] The substrate 1 is Rogers Ro3003G2, the thickness of the substrate 1 is 0.127 mm, and the copper cladding thickness is 0.5 oz; the patch length of the main radiation unit 3 is 1.153 mm, the width is 1 mm, and the embedded length of the main radiation unit 3 is 0.406 mm; the patch length of the auxiliary radiation unit 5 is 1.113 mm, the width is 1 mm, and the embedded length of the auxiliary radiation unit 5 is 0.424 mm; the width of the main feeder 4 is 0.3 mm; the total length of the auxiliary feeder 6 is 3.36 mm, and the width of the auxiliary feeder 6 is 0.3 mm; the distance between the main radiation unit 3 and the auxiliary radiation unit 5 is 2 mm, the distance between the main radiation units 3 is 2 mm, and the distance between the auxiliary radiation units 5 is 2 mm.

[0058] The antenna reflection coefficient and the H-plane radiation pattern of the coupled feeder array antenna 100 according to the embodiments of the present invention are respectively simulated and tested, and the H-plane pattern of an embodiment in which the total length of an auxiliary feeder 6 is 3.96 mm is simulated and tested. Specifically, the reflection coefficient diagram and the H-plane radiation pattern of the coupled feeder array antenna 100 according to the embodiments of the present invention, and the H-plane radiation pattern of the embodiment in which the total length of the auxiliary feeder 6 is 3.96 mm are obtained.

[0059] Among them, the plane perpendicular to the electric field direction is called the H-plane, that is, the plane formed by the first direction and the second direction.

[0060] As Figure 5 shown, Figure 5 is the reflection coefficient diagram of the coupled feeder array antenna according to the embodiment of the present invention, which corresponds to Figure 2 the structure of the coupled feeder array antenna shown. It can be seen from Figure 5 that on the one hand, the minimum point of the reflection coefficient is at 76.5 GHz, indicating that the operating frequency of the antenna is 76.5 GHz. On the other hand, the antenna impedance bandwidth less than -10 dB is 75 - 77.9 GHz, greater than 2.9 GHz, indicating that the antenna has a relatively wide impedance bandwidth.

[0061] As Figure 6 shown, Figure 6 is the H-plane radiation pattern of the coupled feeder array antenna according to the embodiment of the present invention, which corresponds to Figure 2 the structure of the coupled feeder array antenna shown. Among them, the operating frequency uses Figure 5 the frequency Freq = 76.5 GHz in Figure 6 . It can be seen from Figure 8 that the main feature of this pattern is an "equal shoulder" shape, which is actually equivalent to beamforming (a special beam shape, different from the conventional beam shape). This kind of pattern is required in some radar applications. It should be noted that the conventional beam shape has a zero point (i.e., a very deep depression point, taking Figure 8 as an example, about -50°), which will cause the radar to not be able to detect targets in this direction.

[0062] As Figure 7 shown, Figure 7 is a schematic structural diagram of the antenna body with the total length of the auxiliary feeder 6 being 3.96 mm, which can generate a wide beam as shown in Figure 8 .

[0063] As Figure 8 shown, Figure 8 it is Figure 7 the H-plane radiation pattern of the coupled feed line array antenna 100 in Figure 5 , where the operating frequency uses the frequency Freq = 76.5 GHz in Figure 8 . It can be seen from

[0064] that, Figure 5 in Figure 6 and Figure 8 , the abscissa is the frequency, Freq [GHz], and the ordinate is the reflection coefficient, gamma [dB];

[0065] From Figure 5 , Figure 6 , Figure 8 it can be known that by adopting the coupled feed method, it is convenient to adjust the excitation phase distribution and excitation amplitude distribution, which can not only simplify the design process of the feed network, but also improve the impedance bandwidth, improve the radar detection continuity and realize a wide beam by adjusting the design parameters, thereby improving the radiation performance of the array antenna.

[0066] The embodiment of the present invention also provides a coupled feed planar array antenna, which includes a plurality of coupled feed line array antennas 100 as described above, and the plurality of coupled feed line array antennas 100 are arranged at intervals in the same plane. By arraying the coupled feed line array antennas 100 into a coupled feed planar array antenna, the antenna gain can be improved, and it has the characteristics of high impedance bandwidth, high detection continuity and wide beam of the coupled feed line array antenna 100.

[0067] The embodiment of the present invention further provides a radar, which includes the coupled feed line array antenna 100 as described above. The radar includes the coupled feed line array antenna 100, has a simple design, has a relatively wide impedance bandwidth, and can continuously detect targets in both the main lobe and sidelobe regions.

[0068] The embodiment of the present invention further provides a vehicle, which includes the radar as described above. By setting a radar with a relatively wide impedance bandwidth and capable of continuously detecting targets in both the main lobe and sidelobe regions, the radar blind area can be reduced, and the automatic driving and assisted driving effects of the vehicle can be improved.

[0069] Differing from the related art, for the coupled feed wire array antenna 100, the coupled feed planar array antenna, the radar and the vehicle according to the embodiments of the present invention, by adopting the coupled feed method, the delay amount, i.e., the excitation phase distribution, can be adjusted by adjusting the length of the auxiliary feed line 6, and the coupling amount, i.e., the excitation amplitude distribution, can be adjusted by adjusting the gap between the auxiliary feed line 6 and the main radiation unit 3, thereby simplifying the design process of the feed network, reducing the loss of the feed network, and reducing the processing difficulty and improving the radiation performance of the array antenna.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and 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 brevity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A coupled feeder array antenna, characterized in that, Comprising: A substrate, the normal line of the substrate being parallel to the first direction; A main radiation unit, the main radiation unit being disposed on the first surface of the substrate; A main feeder, the main feeder being disposed on the first surface of the substrate, one end of the main feeder being connected to the main radiation unit, and the other end of the main feeder being connected to an antenna port; An auxiliary radiation unit, the auxiliary radiation unit being disposed on the first surface of the substrate, and along the second direction, the two auxiliary radiation units being symmetrically disposed on both sides of the main radiation unit; And, An auxiliary feeder, the auxiliary feeder being disposed on the first surface of the substrate, and along the second direction, the two auxiliary feeders being symmetrically disposed on both sides of the main radiation unit, the auxiliary feeder including a first section and a second section, the first section being disposed adjacent to the main radiation unit, there being a gap between the first section and the main radiation unit, and the second section being connected to the first section and the auxiliary radiation unit; Wherein, the first direction is perpendicular to the second direction.

2. The coupled feeder array antenna according to claim 1, wherein The main radiation unit includes a first side and a second side oppositely disposed in the second direction, both the first side and the second side being perpendicular to the second direction.

3. The coupled feeder array antenna according to claim 2, wherein The first section is parallel to the first side or the second side.

4. The coupled feeder array antenna according to claim 1, wherein The auxiliary feeder further includes a third section, the second section being connected to the auxiliary radiation unit through the third section, the third section being parallel to the first section, and the second section being perpendicular to the first section.

5. The coupled feeder array antenna according to claim 4, characterized in that, The connection between the second section and the first section is provided with a rounded corner, and the connection between the second section and the third section is provided with a rounded corner.

6. The coupled feeder array antenna according to claim 1, wherein The main radiation unit includes a third side parallel to the second direction, two first protrusions being spaced and protruding from the third side, and the main feeder being connected to the third side and located between the two first protrusions.

7. The coupled feeder array antenna according to claim 1, characterized in that, The auxiliary radiation unit includes a fourth side parallel to the second direction, two second protrusions being spaced and protruding from the fourth side, and the second section being connected to the fourth side and located between the two second protrusions.

8. A coupled feed planar array antenna, characterized in that The coupled-feed planar array antenna includes a plurality of coupled-feed linear array antennas according to any one of claims 1-7, and the plurality of coupled-feed linear array antennas are arranged at intervals in the same plane.

9. A radar, characterized in that, Including the coupled-feed linear array antenna according to any one of claims 1-7.

10. A vehicle, characterized in that, Including the radar according to claim 9.

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