Vehicle-mounted antenna unit and vehicle

Abstract

The utility model provides a vehicle-mounted antenna unit and a vehicle. The vehicle-mounted antenna unit comprises a vehicle body assembly and an antenna unit arranged on the vehicle body assembly, the antenna unit comprises a first radiation arm and a second radiation arm which are connected through a Balun transmission line, the first radiation arm is provided with a first electric connection end, and the second radiation arm is provided with a second electric connection end. One of the first electric connection end and the second electric connection end is used for being electrically connected with a signal end of a communication control module, the other one is used for being electrically connected with a ground return end of the communication control module, at least one of the first radiation arm and the second radiation arm is provided with a radiation slot, and an opening of the radiation slot faces one side deviating from the ground; the first radiation arm and the second radiation arm are used for generating a first resonance mode supporting a first frequency band, and the radiation slot is used for generating a second resonance mode supporting a second frequency band and a third resonance mode supporting a third frequency band. The antenna unit and the vehicle provided by the utility model can support multiple frequency bands and are beneficial to miniaturization.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to an in-vehicle antenna unit and a vehicle. Background Art

[0002] With the rapid development of information communication and global positioning, vehicle networking and high-precision positioning have been closely related to social progress. Whether it is information communication or satellite positioning, it is inseparable from the information transmission and reception of the terminal. However, in related technologies, it is difficult to achieve miniaturization design when in-vehicle antennas support multiple frequency bands. Summary of the Utility Model

[0003] This application provides an in-vehicle antenna unit and a vehicle that can support multiple frequency bands and are conducive to miniaturization.

[0004] On the one hand, this application provides an in-vehicle antenna unit, including a vehicle body component and an antenna unit disposed on the vehicle body component. The antenna unit includes a first radiation arm and a second radiation arm connected by a balun transmission line. The first radiation arm has a first electrical connection end, and the second radiation arm has a second electrical connection end. One of the first electrical connection end and the second electrical connection end is used to electrically connect to the signal end of the communication control module, and the other is used to electrically connect to the ground return end of the communication control module. At least one of the first radiation arm and the second radiation arm is provided with a radiation slot, and the opening of the radiation slot faces away from the ground. The first radiation arm and the second radiation arm are used to generate a first resonance mode supporting a first frequency band under the excitation of the communication control module, and the radiation slot is used to generate a second resonance mode supporting a second frequency band and a third resonance mode supporting a third frequency band under the excitation of the communication control module.

[0005] In a possible embodiment, the first frequency band is in the low frequency range, the second frequency band is in the medium frequency range, and the third frequency band is in the high frequency range.

[0006] In a possible embodiment, the radiation slot includes a first radiation slot. The first radiation arm is provided with the first radiation slot, and the first radiation arm has a first edge and a second edge oppositely arranged along a first direction. The first radiation slot includes a first slot portion extending along the first direction, a second slot portion extending along a second direction, and a third slot portion extending along a third direction. The first slot portion, the second slot portion, and the third slot portion are connected and communicated. The opening of the first slot portion is flush with the first edge, and the second slot portion and the third slot portion are located between the first edge and the second edge. The second direction intersects the first direction, and the third direction intersects the first direction.

[0007] In a possible embodiment, the second direction is perpendicular to the first direction. The second slit portion and the third slit portion are flush with each other and are located on opposite sides of the first slit portion. Moreover, the extension length of the second slit portion is different from that of the third slit portion. The first edge is located on the side of the second edge away from the ground.

[0008] In a possible embodiment, the first radiating arm further has a third edge. One end of the third edge is connected to the first edge, and the other end is connected to the balun transmission line. In the direction pointing from the first radiating arm to the second radiating arm, the third edge gradually approaches the second edge.

[0009] In a possible embodiment, the radiating slit further includes a second radiating slit. The second radiating arm is provided with the second radiating slit. Moreover, the second radiating arm has a fourth edge and a fifth edge that are oppositely arranged in a fourth direction. The second radiating slit includes a fourth slit portion extending in the fourth direction, a fifth slit portion extending in a fifth direction, and a sixth slit portion extending in a sixth direction. The fourth slit portion, the fifth slit portion, and the sixth slit portion are in communication with each other. The opening of the fourth slit portion is flush with the fourth edge. The fifth slit portion and the sixth slit portion are located between the fourth edge and the fifth edge. The fifth direction intersects the fourth direction, and the sixth direction intersects the fourth direction.

[0010] In a possible embodiment, at least part of the first radiating arm and at least part of the second radiating arm are mirror-symmetrical, and the first radiating slit and the second radiating slit are mirror-symmetrical.

[0011] In a possible embodiment, at least one of the first radiating arm and the second radiating arm is further provided with a tuning slit. The tuning slit is spaced apart from the radiating slit and is used to achieve impedance adjustment.

[0012] In a possible embodiment, the antenna unit further includes a boundary conductor. The boundary conductor surrounds the circumferences of the first radiating arm and the second radiating arm. A resonant cavity is formed between the boundary conductor and the first radiating arm and the second radiating arm.

[0013] On the other hand, the present application further provides a vehicle, including a communication control module and the in-vehicle antenna unit described above. The communication control module has a signal terminal and a ground return terminal.

[0014] The vehicle-mounted antenna unit provided by the present application includes a vehicle body component and an antenna unit disposed on the vehicle body component. The antenna unit includes a first radiation arm and a second radiation arm connected by a balun transmission line. The first radiation arm has a first electrical connection end, and the second radiation arm has a second electrical connection end. Since the first radiation arm and the second radiation arm are connected by a balun transmission line, one of the first electrical connection end and the second electrical connection end is used to electrically connect to the signal end of the communication control module, and the other is used to electrically connect to the ground end of the communication control module. That is, the first radiation arm, the balun transmission line, the second radiation arm, and the communication control module form an antenna loop. Therefore, the first radiation arm and the second radiation arm can generate resonant current under the excitation of the communication control module. At least one of the first radiation arm and the second radiation arm is provided with a radiation slot. The first radiation arm and the second radiation arm are used to generate a first resonant mode supporting the first frequency band under the excitation of the communication control module, and the radiation slot is used to generate a second resonant mode supporting the second frequency band and a third resonant mode supporting the third frequency band under the excitation of the communication control module. That is, a radiation slot capable of supporting communication in the second and third frequency bands is formed by opening a slot on the first radiation arm and / or the second radiation arm that originally supports communication in the first frequency band. In this way, when supporting multiple frequency bands, there is no need to additionally increase the antenna radiation arm, and the miniaturization of the antenna unit can be realized. The vehicle provided by the present application includes the antenna unit described above, so it can achieve miniaturized design while supporting multiple frequency bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below.

[0016] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0017] Figure 2 is Figure 1 a schematic structural diagram of the communication control module, the vehicle body component and the antenna unit in the vehicle shown;

[0018] Figure 3 It is a schematic structural diagram of an antenna unit provided by an embodiment of the present application;

[0019] Figure 4 It is another schematic structural diagram of an antenna unit provided by an embodiment of the present application;

[0020] Figure 5 It is a third schematic structural diagram of an antenna unit provided by an embodiment of the present application;

[0021] Figure 6 It is a fourth schematic structural diagram of an antenna unit provided by an embodiment of the present application;

[0022] Figure 7The fifth structural schematic diagram of the antenna unit provided by the embodiment of the present application;

[0023] Figure 8 The sixth structural schematic diagram of the antenna unit provided by the embodiment of the present application;

[0024] Figure 9 is Figure 3 The structural schematic diagram of the antenna unit shown also provided with a tuning slot;

[0025] Figure 10 is Figure 5 The structural schematic diagram of the antenna unit shown also provided with a tuning slot;

[0026] Figure 11 is Figure 7 The structural schematic diagram of the antenna unit shown also provided with a tuning slot;

[0027] Figure 12 is Figure 4 The structural schematic diagram of the antenna unit shown also including a boundary conductor;

[0028] Figure 13 is Figure 6 The structural schematic diagram of the antenna unit shown also including a boundary conductor;

[0029] Figure 14 is Figure 7 The structural schematic diagram of the antenna unit shown also including a boundary conductor;

[0030] Figure 15 The standing wave ratio curve graph of the antenna unit provided by the embodiment of the present application;

[0031] Figure 16 The radiation efficiency curve graph of the antenna unit provided by the embodiment of the present application.

[0032] Explanation of reference numerals:

[0033] Vehicle 1000; communication control module 300; body component 200; antenna unit 100; first radiation arm 10; second radiation arm 20; outer glass plate 21; adhesive layer 22; inner glass plate 23; first surface 21a; second surface 21b; third surface 23a; fourth surface 23b; first electrical connection end 101; second electrical connection end 201; radiation slot 30; first radiation slot 301; first edge 102; second edge 103; first slot portion 310; second slot portion 311; third slot portion 312; third edge 104; sixth edge 105; second radiation slot 302; fourth edge 202; fifth edge 203; fourth slot portion 320; fifth slot portion 321; sixth slot portion 322; seventh edge 204; eighth edge 205; balun transmission line 40; tuning slot 50; first tuning slot 501; second tuning slot 502; boundary conductor 60; first conductor portion 601; second conductor portion 602; third conductor portion 603; first sub-boundary conductor 604; second sub-boundary conductor 605. Detailed implementation manner

[0034] The technical solution provided by the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments described in the present application belong to the protection scope of the present application.

[0035] In the present application, referring to "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an exclusive, independent or alternative embodiment to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0036] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example: a component or device including one or more components is not limited to the one or more components listed, but optionally further includes one or more components not listed but inherent to the product shown, or one or more components that should be had based on the described function.

[0037] Please refer to Figures 1 to 4 , Figure 1 which is a schematic structural diagram of the vehicle 1000 provided by the embodiment of the present application, Figure 2 isFigure 1 A schematic structural diagram of a communication control module 300, a body component 200, and an antenna unit 100 in the vehicle 1000 shown Figure 3 A schematic structural diagram of the antenna unit 100 provided by an embodiment of the present application Figure 4 Another schematic structural diagram of the antenna unit 100 provided by an embodiment of the present application. The vehicle 1000 includes a communication control module 300 and an in-vehicle antenna unit. The in-vehicle antenna unit includes a body component 200 and an antenna unit 100 provided on the body component 200. The communication control module 300 has a signal terminal and a ground terminal. The potential of the ground terminal can be zero. The communication control module 300 is provided inside the vehicle 1000. The body component 200 may include a body body, body exterior parts, body interior parts, body electrical accessories, window glass, etc. The antenna unit 100 includes a first radiation arm 10 and a second radiation arm 20 connected by a balun transmission line 40.

[0038] The antenna unit 100 is provided on the body component 200. In a possible embodiment, the antenna unit 100 being provided on the body component 200 may be that the antenna unit 100 is provided on the window glass. For example: The antenna unit 100 may be provided on the front windshield, or the door glass (such as the corner window glass), or the rear windshield. In another possible embodiment, the antenna unit 100 being provided on the body component 200 may be that the antenna unit 100 is provided on a non-horizontal planar structure of the body body, or body exterior parts, or body interior parts. Among them, the body exterior parts include but are not limited to exterior decorative parts, exterior rearview mirrors, exterior protection parts, etc. The body interior parts include but are not limited to sun visors, interior rearview mirrors, interior decorative parts, etc.

[0039] Optionally, the window glass includes laminated glass, and the antenna unit 100 is disposed on the laminated glass. Among them, the laminated glass includes an outer glass plate 21, an adhesive layer 22, and an inner glass plate 23 that are stacked. The outer glass plate 21 includes a first surface 21a and a second surface 21b that are oppositely disposed. The inner glass plate 23 includes a third surface 23a and a fourth surface 23b that are oppositely disposed. The first surface 21a of the outer glass plate 21 faces the outside of the vehicle 1000. The fourth surface 23b of the inner glass plate 23 faces the inside of the vehicle 1000. The adhesive layer 22 connects the second surface 21b of the outer glass plate 21 to the third surface 23a of the inner glass plate 23. This application does not specifically limit the thickness of the outer glass plate 21 and the thickness of the inner glass plate 23. Optionally, the thickness of the outer glass plate 21 may be between 1.8 mm and 2.5 mm, and the thickness of the inner glass plate 23 may be between 1.8 mm and 2.5 mm. The thickness of the outer glass plate 21 and the thickness of the inner glass plate 23 may be the same or different. The material of the adhesive layer 22 may include polyvinyl butyral (PVB), or ethylene-vinyl acetate copolymer (EVA). This application does not specifically limit the thickness of the adhesive layer 22. Optionally, the thickness of the adhesive layer 22 may be between 0.5 mm and 1.5 mm. In a possible embodiment, the first radiation arm 10 and the second radiation arm 20 of the antenna unit 100 may both be disposed on the fourth surface 23b of the inner glass plate 23. In another possible embodiment, the first radiation arm 10 and the second radiation arm 20 of the antenna unit 100 may both be disposed between the second surface 21b and the third surface 23a. Of course, in other possible embodiments, the first radiation arm 10 and the second radiation arm 20 of the antenna unit 100 may be respectively disposed on the fourth surface 23b and between the second surface 21b and the third surface 23a. In the following embodiments, the first radiation arm 10 and the second radiation arm 20 of the antenna unit 100 are both disposed on the fourth surface 23b of the inner glass plate 23 as an example.

[0040] The first radiation arm 10 is a conductor with specific dimensions. The second radiation arm 20 is a conductor with specific dimensions. The material of the first radiation arm 10 includes but is not limited to metals, or conductive materials such as alloys. The material of the second radiation arm 20 includes but is not limited to metals, or conductive materials such as alloys. The material of the first radiation arm 10 and the material of the second radiation arm 20 can be the same or different. In a possible embodiment, the material of the first radiation arm 10 and the material of the second radiation arm 20 can both be copper or silver. The shape of the first radiation arm 10 includes but is not limited to strip-shaped, or sheet-shaped, etc. The shape of the second radiation arm 20 includes but is not limited to strip-shaped, or sheet-shaped, etc. The shape of the first radiation arm 10 and the shape of the second radiation arm 20 can be the same or different. The length extension mode of the first radiation arm 10 includes but is not limited to linear extension, or curved extension, or bent extension, etc. The length extension mode of the second radiation arm 20 includes but is not limited to linear extension, or curved extension, or bent extension, etc. The width of the first radiation arm 10 can be uniform, or gradually changing, or have a sudden change. The width of the second radiation arm 20 can be uniform, or gradually changing, or have a sudden change.

[0041] The first radiation arm 10 and the second radiation arm 20 are connected by a balun transmission line 40. The first radiation arm 10 has a first electrical connection end 101. The second radiation arm 20 has a second electrical connection end 201. One of the first electrical connection end 101 and the second electrical connection end 201 is used to electrically connect to the signal end of the communication control module 300, and the other is used to electrically connect to the ground end of the communication control module 300.

[0042] In a possible embodiment, the balun transmission line 40 can include multiple segments of bent and connected sub-balun transmission lines. The length of the balun transmission line 40 needs to meet the working frequency band requirements of the antenna unit 100. By connecting the first radiation arm 10 and the second radiation arm 20 with the balun transmission line 40, direct current can be conducted to detect whether the antenna unit 100 is normally in place without on-site detection of the resistance. In addition, the balun transmission line 40 can also play a role in impedance matching and can expand the bandwidth of the antenna unit 100.

[0043] In a possible embodiment, the first electrical connection terminal 101 is used to electrically connect to the signal terminal of the communication control module 300, and the second electrical connection terminal 201 is used to electrically connect to the ground terminal of the communication control module 300. In this embodiment, the first electrical connection terminal 101 can achieve electrical connection with the signal terminal by electrically connecting to the inner core of the coaxial cable, and the second electrical connection terminal 201 can achieve electrical connection with the ground terminal by electrically connecting to the outer core of the coaxial cable. Optionally, the first electrical connection terminal 101 is welded to the inner core of the coaxial cable, and the second electrical connection terminal 201 is welded to the outer core of the coaxial cable. In another possible embodiment, the first electrical connection terminal 101 is used to electrically connect to the ground terminal of the communication control module 300, and the second electrical connection terminal 201 is used to electrically connect to the signal terminal of the communication control module 300. In this embodiment, the first electrical connection terminal 101 can achieve electrical connection with the ground terminal by electrically connecting to the outer core of the coaxial cable, and the second electrical connection terminal 201 can achieve electrical connection with the signal terminal by electrically connecting to the inner core of the coaxial cable. Optionally, the first electrical connection terminal 101 is welded to the outer core of the coaxial cable, and the second electrical connection terminal 201 is welded to the inner core of the coaxial cable. In the following embodiments, unless otherwise specified, the example is that the first electrical connection terminal 101 is electrically connected to the signal terminal and the second electrical connection terminal 201 is electrically connected to the ground terminal.

[0044] At least one of the first radiating arm 10 and the second radiating arm 20 is provided with a radiation slot 30. In a possible embodiment, the first radiating arm 10 is provided with a radiation slot 30, and the second radiating arm 20 is not provided with a radiation slot 30, that is, the first radiating arm 10 for electrically connecting to the signal terminal of the communication control module 300 is provided with a radiation slot 30, and the second radiating arm 20 for electrically connecting to the ground terminal of the communication control module 300 is not provided with a radiation slot 30. In another possible embodiment, the first radiating arm 10 is not provided with a radiation slot 30, and the second radiating arm 20 is provided with a radiation slot 30, that is, the first radiating arm 10 for electrically connecting to the signal terminal of the communication control module 300 is not provided with a radiation slot 30, and the second radiating arm 20 for electrically connecting to the ground terminal of the communication control module 300 is provided with a radiation slot 30. In a third possible embodiment, the first radiating arm 10 is provided with a radiation slot 30, and the second radiating arm 20 is also provided with a radiation slot 30, that is, the first radiating arm 10 for electrically connecting to the signal terminal of the communication control module 300 is provided with a radiation slot 30, and the second radiating arm 20 for electrically connecting to the ground terminal of the communication control module 300 is also provided with a radiation slot 30.

[0045] The first radiating arm 10 and the second radiating arm 20 are used to generate a first resonance mode supporting the first frequency band under the excitation of the communication control module 300. The radiation slot 30 is used to generate a second resonance mode supporting the second frequency band and a third resonance mode supporting the third frequency band under the excitation of the communication control module 300.

[0046] It can be understood that the resonant current supporting the first frequency band is mainly distributed on the first radiation arm 10 and the second radiation arm 20. The resonant current supporting the second frequency band is mainly distributed in the radiation slot 30. The resonant current supporting the third frequency band is mainly distributed in the radiation slot 30. Among them, the first frequency band, the second frequency band and the third frequency band are different from each other. In this application, the first radiation arm 10 and the second radiation arm 20 form a dipole antenna, and a slot antenna is formed on the dipole antenna to combine the dipole antenna and the slot antenna to form an antenna unit 100, which can take into account the performance of the antenna unit 100 supporting multiple frequency bands and the miniaturized design of the structure of the antenna unit 100.

[0047] The opening of the radiation slot 30 faces away from the ground. When the opening of the radiation slot 30 faces away from the ground, that is, when the antenna unit 100 is disposed on the vehicle body assembly 200, the opening of the radiation slot 30 of the antenna unit 100 faces upward, so that the communication quality between the antenna unit 100 and the base station can be improved, especially in the second frequency band and the third frequency band.

[0048] The vehicle-mounted antenna unit provided in this application includes a vehicle body assembly 200 and an antenna unit 100 disposed on the vehicle body assembly 200. The antenna unit 100 includes a first radiation arm 10 and a second radiation arm 20 connected by a balun transmission line 40. The first radiation arm 10 has a first electrical connection end 101, and the second radiation arm 20 has a second electrical connection end 201. Since the first radiation arm 10 is connected to the second radiation arm 20, one of the first electrical connection end 101 and the second electrical connection end 201 is used to electrically connect the signal end of the communication control module 300, and the other is used to electrically connect the ground end of the communication control module 300. That is, the first radiation arm 10, the balun transmission line, the second radiation arm 20, and the communication control module 300 form an antenna loop. Therefore, the first radiation arm 10 and the second radiation arm 20 can generate resonant current under the excitation of the communication control module 300. At least one of the first radiation arm 10 and the second radiation arm 20 is provided with a radiation slot 30. The first radiation arm 10 and the second radiation arm 20 are used to generate a first resonant mode supporting the first frequency band under the excitation of the communication control module 300, and the radiation slot 30 is used to generate a second resonant mode supporting the second frequency band and a third resonant mode supporting the third frequency band under the excitation of the communication control module 300. That is, a radiation slot 30 capable of supporting communication in the second frequency band and the third frequency band is formed by opening a slot on the first radiation arm 10 and / or the second radiation arm 20 that originally supports communication in the first frequency band. In this way, in the case of supporting multiple frequency bands, there is no need to additionally increase the antenna radiation arm, and the miniaturization of the antenna unit 100 can be realized. The vehicle 1000 provided in this application includes the antenna unit 100 described above, so that miniaturized design can be realized while supporting multiple frequency bands.

[0049] In a possible embodiment, the first frequency band is in the low frequency range, the second frequency band is in the middle frequency range, and the third frequency band is in the high frequency range. Among them, the low frequency range includes 700 MHz to 960 MHz. The middle frequency range includes 1710 MHz to 2960 MHz. The high frequency range includes 3300 MHz to 5000 MHz.

[0050] In this embodiment, the first frequency band is in the low frequency range, the second frequency band is in the middle frequency range, and the third frequency band is in the high frequency range. That is, the resonant current generated on the first radiation arm 10 and the second radiation arm 20 supports the first frequency band in the low frequency range, and the resonant current generated in the radiation slot 30 supports the second frequency band in the middle frequency range and the third frequency band in the high frequency range. Since the wavelength of the electromagnetic wave signal in the low frequency range is relatively long, slits are formed on the first radiation arm 10 and / or the second radiation arm 20 that supports the low frequency to form a radiation slot 30 that can support the middle and high frequencies, which can ensure the communication quality of the low, middle, and high frequencies, avoid the failure to meet the requirements of the low frequency communication performance, and reduce the difficulty of forming slits on the first radiation arm 10 and / or the second radiation arm 20.

[0051] Please refer to Figure 3 and Figure 4 , the radiation slot 30 includes a first radiation slot 301, and the first radiation arm 10 is provided with the first radiation slot 301. The first radiation arm 10 has a first edge 102 and a second edge 103 that are oppositely arranged in a first direction. The first radiation slot 301 includes a first slot portion 310 extending in the first direction, a second slot portion 311 extending in a second direction, and a third slot portion 312 extending in a third direction. The first slot portion 310, the second slot portion 311, and the third slot portion 312 are connected and communicate with each other. The opening of the first slot portion 310 is flush with the first edge 102, and the second slot portion 311 and the third slot portion 312 are located between the first edge 102 and the second edge 103. The second direction intersects the first direction, and the third direction intersects the first direction.

[0052] It can be understood that the opening of the first slit portion 310 forms the opening of the first radiating slit 301. The opening of the first radiating slit 301 faces away from the ground. In this embodiment, the first radiating arm 10 is provided with one radiating slit 30. The first edge 102 and the second edge 103 can be arranged opposite to each other along the width direction of the first radiating arm 10, that is, the first direction can be the width direction of the first radiating arm 10. The first slit portion 310 extending along the first direction can be understood as the length direction of the first slit portion 310 along the first direction. The second slit portion 311 extending along the first direction can be understood as the length direction of the second slit portion 311 along the second direction. The third slit portion 312 extending along the third direction can be understood as the length direction of the third slit portion 312 along the third direction. Among them, the first slit portion 310 is directly connected to the second slit portion 311, the first slit portion 310 is directly connected to the third slit portion 312, and the second slit portion 311 and the third slit portion 312 can be directly connected or connected through the first slit portion 310. The first radiating slit 301 has an opening located at the first edge 102. Optionally, the second direction intersects the first direction but is not perpendicular, and the third direction intersects the first direction but is not perpendicular; or, the second direction is perpendicular to the first direction, and the third direction intersects the first direction but is not perpendicular; or, the second direction intersects the first direction but is not perpendicular, and the third direction is perpendicular to the first direction; or, the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction. In the embodiment of the present application, the first direction can refer to the Y1 direction shown in the accompanying drawings, the second direction can refer to the X1 direction shown in the accompanying drawings, and the third direction can refer to the X2 direction shown in the accompanying drawings.

[0053] In a possible embodiment, the sum of the lengths of the slits formed by the bending of the first slit portion 310 and the third slit portion 312 is less than the sum of the lengths of the slits formed by the bending of the first slit portion 310 and the second slit portion 311. At this time, the slits formed by the bending of the first slit portion 310 and the second slit portion 311 mainly generate the second resonance mode supporting the intermediate frequency, and the slits formed by the bending of the first slit portion 310 and the third slit portion 312 mainly generate the third resonance mode supporting the high frequency, that is, the resonance current of the intermediate frequency is mainly distributed in the first slit portion 310 and the second slit portion 311, and the resonance current of the high frequency is mainly distributed in the first slit portion 310 and the third slit portion 312.

[0054] The third slit portion 312 may be closer to the first edge 102 relative to the second slit portion 311, or the third slit portion 312 may be closer to the second edge 103 relative to the second slit portion 311, or the third slit portion 312 may be flush with the second slit portion 311, that is, the distance between the third slit portion 312 and the second edge 103 is equal to the distance between the second slit portion 311 and the second edge 103. The second slit portion 311 and the third slit portion 312 may be located on the same side of the first slit portion 310, or may be located on opposite sides of the first slit portion 310.

[0055] By making the first radiation slot 301 include the first slot portion 310, the second slot portion 311 and the third slot portion 312 extending in different directions and communicating with each other, it is beneficial to realize that the first radiation slot 301 generates a second resonance mode supporting the second frequency band and a third resonance mode supporting the third frequency band under the excitation of the communication control module 300, so that the antenna unit 100 can support broadband. In addition, by making the opening of the first slot portion 310 flush with the first edge 102, and the second slot portion 311 and the third slot portion 312 located between the first edge 102 and the second edge 103, it is beneficial to make the efficiency of the upper and lower hemispheres of the antenna unit 100 different, so that by controlling the installation direction of the antenna unit 100, the upper hemisphere of the antenna unit 100 has a relatively high efficiency, so as to improve the communication efficiency between the antenna unit 100 and the base station, and the lower hemisphere of the antenna unit 100 has a relatively low efficiency, so as to reduce the reflection effect of the ground.

[0056] Please refer to Figure 3 and Figure 4 , the second direction is perpendicular to the first direction, the second slit portion 311 is flush with the third slit portion 312 and is located on opposite sides of the first slit portion 310, and the extension length of the second slit portion 311 is different from the extension length of the third slit portion 312.

[0057] It can be understood that in this embodiment, the third direction is also perpendicular to the first direction. The first slot portion 310 is connected to the second slot portion 311 to form a first sub-radiation slot that is approximately L-shaped, and the first slot portion 310 is connected to the third slot portion 312 to form a second sub-radiation slot that is approximately L-shaped. One of the second slot portion 311 and the third slot portion 312 is located on the side of the first slot portion 310 that is away from the second radiation arm 20, and the other is located on the side of the first slot portion 310 that is facing the second radiation arm 20. The first sub-radiation slot and the second sub-radiation slot are combined to form a first radiation slot 301 that is approximately T-shaped.

[0058] Optionally, the extension length of the second slit portion 311 is greater than that of the third slit portion 312. At this time, the first sub-radiating slit mainly generates a second resonance mode supporting the intermediate frequency, and the second sub-radiating slit mainly generates a third resonance mode supporting the high frequency, that is, the resonance current of the intermediate frequency is mainly distributed in the first slit portion 310 and the second slit portion 311, and the resonance current of the high frequency is mainly distributed in the first slit portion 310 and the third slit portion 312.

[0059] By making the second direction perpendicular to the first direction, the second slit portion 311 is flush with the third slit portion 312, and the extension lengths of the second slit portion 311 and the third slit portion 312 are different, the structure of the first radiating slit 301 can be simplified while enabling the radiating slit 30 to support both the intermediate frequency and the high frequency simultaneously.

[0060] Wherein, the first edge 102 is located on the side of the second edge 103 away from the ground. In other words, the opening of the first radiating slit 301 faces upward. In this embodiment, the upper hemisphere efficiency of the antenna unit 100 can be relatively high, and the lower hemisphere efficiency can be relatively low, so as to realize the pattern shaping of the antenna unit 100, and make the antenna unit 100 radiate in the useful direction as much as possible, so as to increase the radiation utilization rate, improve the communication efficiency, and better meet the 4G / 5G communication application scenarios.

[0061] Further, please refer to Figures 3 to 8 ., the first radiating arm 10 further has a third edge 104, one end of the third edge 104 is connected to the first edge 102, and the other end is connected to the balun transmission line 40. In the direction of the first radiating arm 10 pointing to the second radiating arm 20, the third edge 104 gradually approaches the second edge 103.

[0062] It can be understood that in the direction of the first radiating arm 10 pointing to the second radiating arm 20, the distance between the third edge 104 and the second edge 103 gradually decreases. In other words, the width of the end of the first radiating arm 10 close to the second radiating arm 20 gradually becomes narrower. In a possible embodiment, please refer to Figures 3 to 6 ., the third edge 104 can be arc-shaped, for example: it can be semi-circular arc-shaped, or 1 / 4 circular arc-shaped, etc. In another possible embodiment, please refer to Figure 7 and Figure 8 ., the third edge 104 can be obliquely linear.

[0063] Further, please refer to Figure 5 and Figure 6 ., the first radiating arm 10 may further have a sixth edge 105, and the sixth edge 105 is connected between one end of the first edge 102 away from the second radiating arm 20 and one end of the second edge 103 away from the second radiating arm 20, and the sixth edge 105 is semi-circular arc-shaped.

[0064] In other words, in the direction pointing from the first radiation arm 10 to the second radiation arm 20, the widths of the two ends of the first radiation arm 10 can be relatively narrow, and the width of the middle region of the first radiation arm 10 can be relatively wide.

[0065] In this embodiment, by making the width of at least one end of the first radiation arm 10 gradually change, that is, the width of the first radiation arm 10 gradually decreases from the middle to both sides, the change of the characteristic impedance of the first radiation arm 10 with frequency can be slowed down. As a result, the impedance bandwidth of the first radiation arm 10 becomes wider, and the bandwidth supporting low frequencies of the antenna unit 100 can be expanded.

[0066] Please refer to Figures 3 to 8 , the radiation slot 30 further includes a second radiation slot 302, and the second radiation arm 20 is provided with the second radiation slot 302. The second radiation arm 20 has a fourth edge 202 and a fifth edge 203 oppositely arranged in a fourth direction. The second radiation slot 302 includes a fourth slot portion 320 extending in the fourth direction, a fifth slot portion 321 extending in a fifth direction, and a sixth slot portion 322 extending in a sixth direction. The fourth slot portion 320, the fifth slot portion 321, and the sixth slot portion 322 are connected and communicated. The opening of the fourth slot portion 320 is flush with the fourth edge 202, and the fifth slot portion 321 and the sixth slot portion 322 are located between the fourth edge 202 and the fifth edge 203. The fifth direction intersects the fourth direction, and the sixth direction intersects the fourth direction.

[0067] It can be understood that the opening of the fourth slit portion 320 forms the opening of the second radiation slit 302. The opening of the second radiation slit 302 faces away from the ground. In this embodiment, the second radiation arm 20 is provided with a radiation slit 30. The fourth edge 202 and the fifth edge 203 can be arranged opposite to each other along the width direction of the second radiation arm 20, that is, the fourth direction can be the width direction of the second radiation arm 20. The extension of the fourth slit portion 320 along the fourth direction can be understood as the length direction of the fourth slit portion 320 along the fourth direction. The extension of the fifth slit portion 321 along the fourth direction can be understood as the length direction of the fifth slit portion 321 along the fifth direction. The extension of the sixth slit portion 322 along the sixth direction can be understood as the length direction of the sixth slit portion 322 along the sixth direction. Among them, the fourth slit portion 320 is directly connected to the fifth slit portion 321, the fourth slit portion 320 is directly connected to the sixth slit portion 322, and the fifth slit portion 321 and the sixth slit portion 322 can be directly connected or can be connected through the fourth slit portion 320. The second radiation slit 302 has an opening located at the fourth edge 202. Optionally, the fifth direction intersects but is not perpendicular to the fourth direction, and the sixth direction intersects but is not perpendicular to the fourth direction; or, the fifth direction is perpendicular to the fourth direction, and the sixth direction intersects but is not perpendicular to the fourth direction; or, the fifth direction intersects but is not perpendicular to the fourth direction, and the sixth direction is perpendicular to the fourth direction; or, the fifth direction is perpendicular to the fourth direction, and the sixth direction is perpendicular to the fourth direction. In the embodiment of the present application, the fourth direction can refer to the Y2 direction shown in the accompanying drawings, the fifth direction can refer to the X3 direction shown in the accompanying drawings, and the sixth direction can refer to the X4 direction shown in the accompanying drawings.

[0068] In a possible embodiment, the sum of the lengths of the slits formed by the bending of the fourth slit portion 320 and the sixth slit portion 322 is less than the sum of the lengths of the slits formed by the bending of the fourth slit portion 320 and the fifth slit portion 321. At this time, the slits formed by the bending of the fourth slit portion 320 and the fifth slit portion 321 mainly generate the second resonance mode that supports the intermediate frequency, and the slits formed by the bending of the fourth slit portion 320 and the sixth slit portion 322 mainly generate the third resonance mode that supports the high frequency, that is, the resonance current of the intermediate frequency is mainly distributed in the fourth slit portion 320 and the fifth slit portion 321, and the resonance current of the high frequency is mainly distributed in the fourth slit portion 320 and the sixth slit portion 322.

[0069] Wherein, the sixth slit portion 322 can be closer to the fourth edge 202 relative to the fifth slit portion 321, or the sixth slit portion 322 can be closer to the fifth edge 203 relative to the fifth slit portion 321, or the sixth slit portion 322 can be flush with the fifth slit portion 321, that is, the distance between the sixth slit portion 322 and the fifth edge 203 is equal to the distance between the fifth slit portion 321 and the fifth edge 203. The fifth slit portion 321 and the sixth slit portion 322 can be located on the same side of the fourth slit portion 320, or can also be located on opposite sides of the fourth slit portion 320.

[0070] By making the second radiation slit 302 include the fourth slit portion 320, the fifth slit portion 321 and the sixth slit portion 322 that extend in different directions and are connected and communicate with each other, it is beneficial to realize that the second radiation slit 302 generates a second resonance mode supporting the second frequency band and a third resonance mode supporting the third frequency band under the excitation of the communication control module 300, so that the antenna unit 100 can support a wide frequency band. In addition, by making the opening of the fourth slit portion 320 flush with the fourth edge 202 and the fifth slit portion 321 and the sixth slit portion 322 be located between the fourth edge 202 and the fifth edge 203, it is beneficial to make the efficiencies of the upper and lower hemispheres of the antenna unit 100 different. Thus, by controlling the installation direction of the antenna unit 100, the upper hemisphere of the antenna unit 100 has a relatively high efficiency, so that the communication efficiency between the antenna unit 100 and the base station can be improved, and the lower hemisphere of the antenna unit 100 has a relatively low efficiency, so that the reflection influence of the ground can be reduced.

[0071] Optionally, please refer to Figures 3 to 8 , at least a part of the first radiation arm 10 and at least a part of the second radiation arm 20 are mirror-symmetrical, and the first radiation slit 301 and the second radiation slit 302 are mirror-symmetrical. In this embodiment, the first radiation arm 10 and the second radiation arm 20 basically form a symmetrical dipole antenna, and the first radiation slit 301 and the second radiation slit 302 are equivalent to a symmetrical two-element array antenna.

[0072] In a possible embodiment, the fifth direction is perpendicular to the fourth direction, the sixth slit portion 322 is flush with the fifth slit portion 321 and is located on opposite sides of the fourth slit portion 320, and the extension length of the fifth slit portion 321 is different from the extension length of the sixth slit portion 322.

[0073] It can be understood that in this embodiment, the sixth direction is also perpendicular to the fourth direction. The fourth slot portion 320 is connected to the fifth slot portion 321 to form a third sub-radiation slot that is approximately L-shaped, and the fourth slot portion 320 is connected to the sixth slot portion 322 to form a fourth sub-radiation slot that is approximately L-shaped. One of the fifth slot portion 321 and the sixth slot portion 322 is located on the side of the fourth slot portion 320 that is away from the first radiation arm 10, and the other is located on the side of the fourth slot portion 320 that is facing the first radiation arm 10. The third sub-radiation slot and the fourth sub-radiation slot are combined to form a second radiation slot 302 that is approximately T-shaped.

[0074] Optionally, the extension length of the fifth slot portion 321 is greater than the extension length of the sixth slot portion 322. At this time, the third sub-radiation slot mainly generates the second resonance mode supporting the intermediate frequency, and the fourth sub-radiation slot mainly generates the third resonance mode supporting the high frequency, that is, the resonance current of the intermediate frequency is mainly distributed in the fourth slot portion 320 and the fifth slot portion 321, and the resonance current of the high frequency is mainly distributed in the fourth slot portion 320 and the sixth slot portion 322.

[0075] By making the fifth direction perpendicular to the fourth direction, the fifth slot portion 321 is flush with the sixth slot portion 322, and the extension length of the fifth slot portion 321 is different from the extension length of the sixth slot portion 322, the structure of the second radiation slot 302 can be simplified while the radiation slot 30 can support both the intermediate frequency and the high frequency.

[0076] Wherein, the fourth edge 202 is located on the side of the fifth edge 203 away from the ground. In other words, the opening of the second radiation slot 302 faces upward. This embodiment can achieve a higher efficiency in the upper hemisphere of the antenna unit 100 and a lower efficiency in the lower hemisphere, thereby shaping the directional pattern of the antenna unit 100 and making the antenna unit 100 radiate in a useful direction as much as possible, so as to increase the radiation utilization rate, improve the communication efficiency, and better meet the 4G / 5G communication application scenarios.

[0077] In one possible embodiment, please refer to Figures 3 to 8 , the second radiation arm 20 also has a seventh edge 204, one end of the seventh edge 204 is connected to the fourth edge 202, and the other end is connected to the balun transmission line 40, and in the direction from the second radiation arm 20 to the first radiation arm 10, the seventh edge 204 gradually approaches the fifth edge 203.

[0078] It can be understood that in the direction from the second radiation arm 20 to the first radiation arm 10, the distance between the seventh edge 204 and the fifth edge 203 gradually decreases. In a possible embodiment, please refer to Figures 3 to 6, the seventh edge 204 can be arc-shaped. For example, it can be semi-circular arc-shaped, or 1 / 4 circular arc-shaped, etc. In another possible embodiment, please refer to Figure 7 and Figure 8 , the seventh edge 204 can be oblique linear.

[0079] Furthermore, please refer to Figure 5 and Figure 6 , the second radiating arm 20 may further have an eighth edge 205. The eighth edge 205 is connected between the end of the fourth edge 202 facing away from the first radiating arm 10 and the end of the fifth edge 203 facing away from the first radiating arm 10. The eighth edge 205 is semi-circular arc-shaped.

[0080] In other words, in the direction of the second radiating arm 20 pointing to the first radiating arm 10, the widths of both ends of the second radiating arm 20 can be relatively narrow, and the width of the middle region of the second radiating arm 20 can be relatively wide.

[0081] In this embodiment, by making the width of at least one end of the second radiating arm 20 gradually change, that is, the width of the second radiating arm 20 gradually decreases from the middle to both sides, the characteristic impedance of the second radiating arm 20 with respect to frequency change can be slowed down. Thus, the impedance bandwidth of the second radiating arm 20 becomes wider, and the bandwidth supporting low frequencies of the antenna unit 100 can be expanded.

[0082] Please refer to Figures 9 to 11 , at least one of the first radiating arm 10 and the second radiating arm 20 is further provided with a tuning slot 50. The tuning slot 50 is arranged at an interval from the radiation slot 30. The tuning slot 50 is used to achieve impedance adjustment.

[0083] The tuning slot 50 may include a first tuning slot 501 and / or a second tuning slot 502. In a possible embodiment, when the first radiation arm 10 is provided with a radiation slot 30 and the second radiation arm 20 is not provided with a radiation slot 30, the first radiation arm 10 may further be provided with a first tuning slot 501, and the second radiation arm 20 may not be provided with a tuning slot 50. Alternatively, the first radiation arm 10 may not be provided with a tuning slot 50, and the second radiation arm 20 may be provided with a second tuning slot 502. Or, the first radiation arm 10 and the second radiation arm 20 are respectively provided with a first tuning slot 501 and a second tuning slot 502. In another possible embodiment, when the first radiation arm 10 is not provided with a radiation slot 30 and the second radiation arm 20 is provided with a radiation slot 30, the first radiation arm 10 may further be provided with a first tuning slot 501, and the second radiation arm 20 may not be provided with a tuning slot 50. Alternatively, the first radiation arm 10 may not be provided with a tuning slot 50, and the second radiation arm 20 may be provided with a second tuning slot 502. Or, the first radiation arm 10 and the second radiation arm 20 are respectively provided with a first tuning slot 501 and a second tuning slot 502. In a third possible embodiment, when the first radiation arm 10 is provided with a first radiation slot 301 and the second radiation arm 20 is provided with a second radiation slot 302, the first radiation arm 10 may further be provided with a first tuning slot 501, and the second radiation arm 20 may not be provided with a tuning slot 50. Alternatively, the first radiation arm 10 may not be provided with a tuning slot 50, and the second radiation arm 20 may be provided with a second tuning slot 502. Or, the first radiation arm 10 and the second radiation arm 20 are respectively provided with a first tuning slot 501 and a second tuning slot 502.

[0084] Optionally, in an embodiment where the first radiation arm 10 is provided with a first tuning slot 501, the opening of the first tuning slot 501 may be flush with the edge of the first radiation arm 10 facing the second radiation arm 20, or the opening of the first tuning slot 501 may be flush with the second edge 103. In an embodiment where the second radiation arm 20 is provided with a second tuning slot 502, the opening of the second tuning slot 502 may be flush with the edge of the second radiation arm 20 facing the first radiation arm 10, or the opening of the second tuning slot 502 may be flush with the fifth edge 203 or the seventh edge 204.

[0085] By providing at least one of the first radiation arm 10 and the second radiation arm 20 with a tuning slot 50, the tuning slot 50 can be equivalent to a parallel inductor, so as to be able to adjust the impedance at the feeding point of the antenna unit 100 and reduce the radiation loss caused by impedance mismatch.

[0086] Please refer to Figures 12 to 14, the antenna unit 100 further includes a boundary conductor 60, the boundary conductor 60 is disposed around the circumferences of the first radiation arm 10 and the second radiation arm 20, and a resonant cavity is formed between the boundary conductor 60 and the first radiation arm 10 and the second radiation arm 20.

[0087] In a possible embodiment, as Figure 12 shown, the boundary conductor 60 may include a first conductor portion 601, a second conductor portion 602, and a third conductor portion 603 that are bent and connected. The first conductor portion 601 and the third conductor portion 603 are oppositely disposed, and are respectively spaced on one side of the first radiation arm 10 away from the second radiation arm 20 and one side of the second radiation arm 20 away from the first radiation arm 10. The second conductor portion 602 is spaced on one side of the first radiation arm 10 and the second radiation arm 20 facing the ground.

[0088] In another possible embodiment, please refer to Figure 13 and Figure 14 , the boundary conductor 60 includes a first sub-boundary conductor 604 and a second sub-boundary conductor 605. The first sub-boundary conductor 604 includes a fourth conductor portion, a fifth conductor portion, and a sixth conductor portion that are bent and connected. The fourth conductor portion and the sixth conductor portion are oppositely disposed, and are respectively spaced on one side of the first radiation arm 10 away from the second radiation arm 20 and one side of the second radiation arm 20 away from the first radiation arm 10. The fifth conductor portion is spaced on one side of the first radiation arm 10 and the second radiation arm 20 facing the ground. The second sub-boundary conductor 605 is oppositely disposed to the fifth conductor portion, and is spaced on one side of the first radiation arm 10 and the second radiation arm 20 away from the ground. In this embodiment, the openings of the first radiation gap 301 and the second radiation gap 302 are misaligned with the second sub-boundary conductor 605, that is, the projections of the openings of the first radiation gap 301 and the second radiation gap 302 on the plane where the second sub-boundary conductor 605 is located are located outside the second sub-boundary conductor 605.

[0089] Among them, the boundary conductor 60 may be disposed on the fourth surface 23b of the inner glass plate 23, or the boundary conductor 60 may be disposed between the second surface 21b of the outer glass plate 21 and the third surface 23a of the inner glass plate 23. The boundary conductor 60 and the first radiation arm 10 and the second radiation arm 20 may be disposed on the same surface or on different surfaces. The boundary conductor 60 may include a substrate and a conductor layer formed on the substrate. The material of the substrate may include poly terephthalate plastics (Polyethyleneterephthalate, PET), etc. The material of the conductor layer may include copper, silver, etc.

[0090] By making the antenna unit 100 further include a boundary conductor 60, the boundary conductor 60 surrounds the first radiation arm 10 and the second radiation arm 20 and forms a resonant cavity, which is conducive to concentrating the radiation energy, thereby being able to extend the communication distance of the antenna unit 100.

[0091] Please refer to Figure 15 and Figure 16 , Figure 15 which is the standing wave ratio curve graph of the antenna unit 100 provided by the embodiment of the present application, Figure 16 and which is the radiation efficiency curve graph of the antenna unit 100 provided by the embodiment of the present application. Figure 16 Among them, the three curves are respectively the global efficiency of the antenna unit 100, the upper hemisphere efficiency of the antenna unit 100, and the lower hemisphere efficiency of the antenna unit 100. From Figure 15 it can be seen that the standing wave ratio of the antenna unit 100 is less than 3 at low frequencies and less than 2 at medium and high frequencies, and 4G / 5G full-band communication can be achieved. Thus, it can be seen that the antenna unit 100 of the present application can balance ultra-wideband and miniaturization. From Figure 16 it can be seen that the upper hemisphere efficiency of the antenna unit 100 is higher than the lower hemisphere efficiency. Especially at medium and high frequencies, the upper hemisphere efficiency of the antenna unit 100 is about 10% - 15% higher than the lower hemisphere efficiency, and at low frequencies, the upper hemisphere efficiency of the antenna unit 100 is slightly higher than the lower hemisphere efficiency. Thus, it can be seen that the antenna unit 100 of the present application can effectively radiate towards the upper half space, improving the communication performance with the base station, especially at medium and high frequencies.

[0092] The features mentioned in the above description, claims, and drawings, as long as they are meaningful within the scope of the present application, can be arbitrarily combined with each other. The advantages and features described for the antenna unit 100 are correspondingly applicable to the vehicle 1000.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. A vehicle-mounted antenna unit, characterized in that: The invention comprises a vehicle body component and an antenna unit arranged on the vehicle body component, wherein the antenna unit comprises a first radiating arm and a second radiating arm connected by a balun transmission line, wherein the first radiating arm has a first electrical connection end, and the second radiating arm has a second electrical connection end, wherein one of the first electrical connection end and the second electrical connection end is used to electrically connect to a signal end of a communication control module, and the other is used to electrically connect to a ground return end of the communication control module, wherein at least one of the first radiating arm and the second radiating arm is provided with a radiating slot, wherein the opening of the radiating slot faces a side away from the ground, wherein the first radiating arm and the second radiating arm are used to generate a first resonant mode supporting a first frequency band under the excitation of the communication control module, and wherein the radiating slot is used to generate a second resonant mode supporting a second frequency band and a third resonant mode supporting a third frequency band under the excitation of the communication control module.

2. The vehicle-mounted antenna unit according to claim 1, characterized in that: The first frequency band is located at a low frequency, the second frequency band is located at a medium frequency, and the third frequency band is located at a high frequency.

3. The vehicle-mounted antenna unit according to claim 2, characterized in that: The radiation slot includes a first radiation slot, the first radiation arm is provided with the first radiation slot, and the first radiation arm has a first edge and a second edge arranged opposite to each other along a first direction, the first radiation slot includes a first slot portion extending along the first direction, a second slot portion extending along the second direction, and a third slot portion extending along a third direction, the first slot portion, the second slot portion and the third slot portion are connected, the opening of the first slot portion is flush with the first edge, the second slot portion and the third slot portion are located between the first edge and the second edge, the second direction intersects with the first direction, and the third direction intersects with the first direction.

4. The vehicle-mounted antenna unit according to claim 3, characterized in that: The second direction is perpendicular to the first direction, the second slit portion is flush with the third slit portion and is located on opposite sides of the first slit portion, and an extension length of the second slit portion is different from an extension length of the third slit portion, and the first edge is located on a side of the second edge facing away from the ground.

5. The vehicle-mounted antenna unit according to claim 3, characterized in that: The first radiation arm also has a third edge, one end of the third edge is connected to the first edge, and the other end is connected to the balun transmission line. In the direction from the first radiation arm to the second radiation arm, the third edge gradually approaches the second edge.

6. The vehicle-mounted antenna unit according to any one of claims 3 to 5, characterized in that: The radiation slot also includes a second radiation slot, the second radiation arm is provided with the second radiation slot, and the second radiation arm has a fourth edge and a fifth edge arranged opposite to each other along a fourth direction, the second radiation slot includes a fourth slot portion extending along the fourth direction, a fifth slot portion extending along the fifth direction, and a sixth slot portion extending along the sixth direction, the fourth slot portion, the fifth slot portion and the sixth slot portion are connected, the opening of the fourth slot portion is flush with the fourth edge, the fifth slot portion and the sixth slot portion are located between the fourth edge and the fifth edge, the fifth direction intersects with the fourth direction, and the sixth direction intersects with the fourth direction.

7. The vehicle-mounted antenna unit according to claim 6, characterized in that: At least a portion of the first radiation arm is mirror-symmetrical to at least a portion of the second radiation arm, and the first radiation slot is mirror-symmetrical to the second radiation slot.

8. The vehicle-mounted antenna unit according to any one of claims 1 to 5, characterized in that: At least one of the first radiating arm and the second radiating arm is further provided with a tuning slot, the tuning slot is spaced apart from the radiating slot, and the tuning slot is used to achieve impedance adjustment.

9. The vehicle-mounted antenna unit according to any one of claims 1 to 5, characterized in that: The antenna unit further includes a boundary conductor, which is disposed around the first radiation arm and the second radiation arm, and a resonance cavity is formed between the boundary conductor and the first radiation arm and the second radiation arm.

10. A vehicle, characterized in that: It comprises a communication control module and the vehicle-mounted antenna unit according to any one of claims 1 to 9, wherein the communication control module has a signal terminal and a ground return terminal.

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