MIMO Antenna and Vehicle-mounted Antenna Device

Abstract

The present application discloses a MIMO antenna, which includes a first circuit board, a second circuit board, and a third circuit board disposed between the first circuit board and the second circuit board; a first antenna operating in a first frequency band, a second antenna operating in a second frequency band, and a third antenna operating in a third frequency band are placed on the second circuit board; a fourth antenna operating in a fourth frequency band, a fifth antenna operating in a fifth frequency band, a sixth antenna operating in a sixth frequency band, and a seventh antenna operating in a seventh frequency band are placed on the first circuit board; an artificial magnetic conductor structure is placed on the third circuit board. The MIMO antenna of the present application adopts antenna units with a compact structure and multiple frequency bands, and multiple antennas can simultaneously meet the requirements of multiple frequency bands. Compared with traditional MIMO antennas, which usually have a single antenna unit to meet a single frequency band, resulting in a larger overall antenna size, the present application can achieve multi-frequency broadband performance with antenna miniaturization.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and more particularly to a MIMO antenna and a vehicle-mounted antenna device. Background Art

[0002] Although 4G communication can achieve relatively high transmission rates and low latency, and can meet the initial networking requirements, for networking requirements with higher transmission rates and lower latency, such as autonomous driving and intelligent transportation, 4G communication technology is difficult to meet the requirements. Therefore, it is of great value to design a MIMO antenna that can be comprehensively applied to various communication technologies. Summary of the Invention

[0003] In view of this, embodiments of the present application provide a MIMO antenna to solve the problems in the above background art.

[0004] A MIMO antenna provided by the present application includes a first circuit board, a second circuit board, and a third circuit board disposed between the first circuit board and the second circuit board;

[0005] A first antenna operating in a first frequency band, a second antenna operating in a second frequency band, and a third antenna operating in a third frequency band are placed on the second circuit board;

[0006] A fourth antenna operating in a fourth frequency band, a fifth antenna operating in a fifth frequency band, a sixth antenna operating in a sixth frequency band, and a seventh antenna operating in a seventh frequency band are placed on the first circuit board;

[0007] An artificial magnetic conductor structure is placed on the third circuit board.

[0008] Optionally, the first antenna is a WiFi / Bluetooth antenna and operates in the WiFi / Bluetooth frequency band;

[0009] The second antenna, the third antenna, the fourth antenna, and the fifth antenna are 5G antennas and operate in the N41 and / or N78 and / or N79 frequency bands;

[0010] The sixth antenna and the seventh antenna are 4G antennas and operate in the 2G / 3G / LTE frequency bands.

[0011] Optionally, the fourth antenna and the fifth antenna are orthogonally and vertically distributed with respect to the second antenna and the third antenna.

[0012] Optionally, the first antenna uses a coplanar waveguide structure.

[0013] Optionally, the sixth antenna and the seventh antenna use a stepped impedance resonator structure.

[0014] Optionally, the sixth antenna and the seventh antenna are distributed at the diagonals of the first circuit board, and the fourth antenna and the fifth antenna are distributed at the other diagonals of the first circuit board.

[0015] Optionally, a first isolation strip is provided between the first antenna and the second antenna, and a second isolation strip is provided between the second antenna and the third antenna.

[0016] Optionally, the second antenna and the third antenna are fed through a pad structure.

[0017] Optionally, the first antenna is in a first conductive pattern, the second antenna and the third antenna are in a second conductive pattern, the fourth antenna and the fifth antenna are in a third conductive pattern, the sixth antenna and the seventh antenna are in a fourth conductive pattern, the artificial magnetic conductor structure is in a fifth conductive pattern, and the first isolation strip and the second isolation strip are in a sixth conductive pattern.

[0018] A vehicle-mounted antenna device provided by this application includes the MIMO antenna as described above.

[0019] An MIMO antenna provided by an embodiment of this application adopts antenna units with a compact structure and multiple frequency bands, and multiple antennas can simultaneously meet the requirements of multiple frequency bands. Compared with traditional MIMO antennas, which usually have a single antenna unit to meet a single frequency band, resulting in a relatively large overall antenna size, the MIMO antenna of this application can achieve multi-band wideband performance with antenna miniaturization. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an MIMO antenna according to an embodiment of this application;

[0022] Figure 2 It is a schematic structural diagram of a first circuit board according to an embodiment of this application;

[0023] Figure 3 It is a schematic structural diagram of a second circuit board according to an embodiment of this application;

[0024] Figure 4 It is a schematic structural diagram of a third circuit board according to an embodiment of this application;

[0025] Figure 5Curve graph of S-parameters and gain of the first antenna according to an embodiment of the present application;

[0026] Figure 6 Curve graph of S-parameters of the 5G antenna according to an embodiment of the present application;

[0027] Figure 7 Curve graph of gain of the 5G antenna according to an embodiment of the present application;

[0028] Figure 8 Curve graph of S-parameters and gain of the 4G antenna according to an embodiment of the present application;

[0029] Figure 9 Curve graph of antenna isolation according to an embodiment of the present application;

[0030] Figure 10 Schematic diagram of the radiation pattern of the first antenna according to an embodiment of the present application;

[0031] Figure 11 Schematic diagram of the radiation pattern of the second antenna according to an embodiment of the present application;

[0032] Figure 12 Schematic diagram of the radiation pattern of the third antenna according to an embodiment of the present application;

[0033] Figure 13 Schematic diagram of the radiation pattern of the fourth antenna according to an embodiment of the present application;

[0034] Figure 14 Schematic diagram of the radiation pattern of the fifth antenna according to an embodiment of the present application;

[0035] Figure 15 Schematic diagram of the radiation pattern of the sixth antenna according to an embodiment of the present application;

[0036] Figure 16 Schematic diagram of the radiation pattern of the seventh antenna according to an embodiment of the present application. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly described below in conjunction with embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments, rather than all of them. Based on the embodiments in the present application, and without conflict, the following various embodiments and their technical features can be combined with each other.

[0038] Although 4G communication can already achieve relatively high transmission rates and low latency, and can meet the initial networking requirements, for networking requirements with higher transmission rates and lower latency, such as autonomous driving and intelligent transportation, the 4G communication technology is difficult to meet the requirements. Therefore, it is of great value to design a MIMO antenna that can be comprehensively applied to various communication technologies.

[0039] Especially in the field of vehicle-mounted antennas, today's MIMO (Multiple-Input Multiple-Output) vehicle-mounted antennas generally can only meet the 2G / 3G / LTE frequency bands, and usually only one frequency band can be achieved by a single antenna. Since the GSM900 frequency band has a relatively low frequency, the overall antenna size will inevitably be relatively large, and the isolation performance is also poor. In addition, a large number of antennas will also affect the radiation performance of the overall antenna. The shark fin vehicle-mounted antenna is favored by the market due to its relatively beautiful appearance, but its relatively fixed structure makes it difficult for the overall antenna to be compatible with the 5G frequency band. Moreover, the styles of many brand cars today are not suitable for using shark fin antennas, which makes the vehicle-mounted box antenna with a compact structure have more application scenarios. Therefore, it is a major difficulty in the design of MIMO vehicle-mounted antennas to achieve good isolation and miniaturization on the basis of covering the 2G / 3G / LTE / WiFi / Bluetooth / 5G frequency band bandwidth. In addition, issues such as material selection cannot be ignored when designing antennas.

[0040] In a first aspect, an embodiment of the present application provides a MIMO antenna. Figure 1 It is a schematic structural diagram of a MIMO antenna according to an embodiment of the present application.

[0041] As Figure 1 shown, the MIMO antenna includes a first circuit board 100, a second circuit board 200, and a third circuit board 300 disposed between the first circuit board 100 and the second circuit board 200.

[0042] On the second circuit board 200, a first antenna 001 operating in a first frequency band, a second antenna 002 operating in a second frequency band, and a third antenna 003 operating in a third frequency band are placed;

[0043] On the first circuit board 100, a fourth antenna 004 operating in a fourth frequency band, a fifth antenna 005 operating in a fifth frequency band, a sixth antenna 006 operating in a sixth frequency band, and a seventh antenna 007 operating in a seventh frequency band are placed.

[0044] An artificial magnetic conductor structure (Artificial Magnetic Conductor, AMC) is placed on the third circuit board 300.

[0045] The MIMO antenna according to the embodiment of the present application adopts a compact and multi-band antenna unit, and multiple antennas can simultaneously meet the requirements of multiple frequency bands. Compared with traditional MIMO antennas, usually one antenna unit meets a single frequency band, resulting in a relatively large overall antenna size. The MIMO antenna of the present application can achieve multi-frequency broadband performance under antenna miniaturization.

[0046] It can be understood that in some embodiments, the number of antennas placed on the circuit board and the operating frequency bands can be set according to actual needs.

[0047] In some embodiments, the first antenna 001 is a WiFi / Bluetooth antenna and operates in the WiFi / Bluetooth frequency band. The second antenna 002, the third antenna 003, the fourth antenna 004, and the fifth antenna 005 are 5G antennas, and all 4 5G antennas use a broadband structure to achieve the required 5G frequency bands, namely the N41 and / or N78 and / or N79 frequency bands. The sixth antenna 006 and the seventh antenna 007 are 4G antennas and operate in the 2G / 3G / LTE frequency band.

[0048] In some embodiments, the thickness of the three circuit boards (or dielectric substrates) used in this embodiment is 1.5 mm, and the dielectric constant is 4.4. The first circuit board uses metal to print 4 antennas, namely two 5G antennas (the fourth antenna 004 and the fifth antenna 005), and two 4G antennas (the sixth antenna 006 and the seventh antenna 007). The second circuit board uses metal to print 3 antennas, namely 1 WiFi / Bluetooth antenna (the first antenna 001) and two 5G antennas (the second antenna 002 and the third antenna 003). The third circuit board uses metal to print an artificial magnetic conductor structure.

[0049] Figure 2 It is a schematic structural diagram of the first circuit board of an embodiment of the present application. As Figure 2 shown, the fourth antenna 004 and the fifth antenna 005 placed on the first circuit board 100 are 5G antennas and present a third conductive pattern. Among them, the ground of the fourth antenna 004 and the fifth antenna 005 is designed on the lower surface of the first circuit board, and the contour of the ground is designed in the shape of grass. The radiation patch of the antenna is designed on the upper surface of the first circuit board, and the contour of the radiation patch is designed in the shape of a tree.

[0050] The sixth antenna 006 and the seventh antenna 007 are 4G antennas and present a fourth conductive pattern. Among them, the ground of the sixth antenna 006 and the seventh antenna 007 is designed on the lower surface of the first circuit board, and the contour of the ground is designed in the shape of grass. A stepped impedance resonator extends from the common ground structure, and the stepped impedance resonator is mainly coupled and excited by the 4G antenna dipole patch on the upper surface. The stepped impedance resonator can enable the 4G antenna to achieve better impedance matching, increase the bandwidth, and the stepped impedance resonator is designed in the shape of bamboo plus bamboo leaves. The radiation patch of the antenna is designed on the upper surface of the first circuit board, and the contour of the radiation patch is designed in the shape of a gazebo.

[0051] This can achieve the artistic design of the antenna. In the past, antennas basically adopted relatively regular traditional shapes, with serious homogenization. In the embodiments of the present application, each antenna is artistically processed and a garden theme is formed, which is more beautiful.

[0052] As Figure 2 shown, the sixth antenna 006 and the seventh antenna 007 are distributed at the diagonals of the first circuit board 100, and the fourth antenna 004 and the fifth antenna 005 are distributed at the other diagonals of the first circuit board 100. That is, two 4G antennas and two 5G antennas are respectively placed at the diagonals of the first circuit board 100, so that the coverage range of the antenna is enhanced, the influence of uneven radiation caused by too many antennas is reduced, and the radiation performance of the antenna is enhanced.

[0053] In some embodiments, the sixth antenna 006 and the seventh antenna 007 use a stepped impedance resonator structure. A good impedance matching is achieved through the stepped impedance resonator structure. The stepped impedance resonator extends from the ground, and the stepped impedance resonator is artistically designed into the shape of bamboo and is mainly excited by dipole patch coupling radiation, thereby enhancing the bandwidth performance of the 4G antenna.

[0054] Figure 3 This is a schematic structural diagram of the second circuit board according to an embodiment of the present application. As Figure 3 shown, the first antenna 001 placed on the second circuit board 200 is a WiFi / Bluetooth antenna and is in the form of a first conductive pattern. Among them, the ground and the radiation patch of the first antenna 001 are both designed on the upper surface of the second circuit board. The ground of the antenna is designed in the shape of a leaf, and the radiation patch is designed in the shape of a peach.

[0055] The second antenna 002 and the third antenna 003 are 5G antennas and are in the form of a second conductive pattern. Among them, the second antenna 002 and the third antenna 003 use a structure combining coplanar waveguide and pad for feeding. The ground of the 5G antenna is designed in the shape of grassland, and the radiation patch is designed in the shape of a tree.

[0056] This can achieve the artistic design of the antenna. In the past, antennas basically adopted relatively regular traditional shapes, with serious homogenization. In the embodiments of the present application, each antenna is artistically processed and a garden theme is formed, which is more beautiful.

[0057] As Figures 1 to 3 shown, the fourth antenna 004 and the fifth antenna 005 are orthogonally and vertically distributed in terms of position layout with the second antenna 002 and the third antenna 003, so that the radiation range of the 5G antenna is greatly enhanced and the radiation effect is better.

[0058] In some embodiments, the first antenna 001 uses a coplanar waveguide structure to achieve the broadband performance of the antenna by using the coplanar waveguide structure. An artificial magnetic conductor structure is used above the second antenna 002 and the third antenna 003, further improving the bandwidth performance of the antenna.

[0059] In some embodiments, the second antenna 002 and the third antenna 003 are fed through a pad structure. This enables the feed cables of the WiFi antenna (the first antenna) and the two 5G antennas (the second antenna 2 and the third antenna) to be led out from above the first circuit board, reducing the impact of the feed cable lead-out on the antenna radiation and ensuring that the feed cables of all antennas can be led out in the same direction.

[0060] To improve the isolation between adjacent antennas, as Figure 3 shown, a first isolation band 008 is provided between the first antenna 001 and the second antenna 002, and a second isolation band 009 is provided between the second antenna 002 and the third antenna 003. The first isolation band 008 and the second isolation band 009 are in the form of a sixth conductive pattern, i.e., a fence pattern.

[0061] Figure 4 FIG. is a schematic structural diagram of a third circuit board according to an embodiment of the present application. As Figure 4 shown, the artificial magnetic conductor structure placed on the third circuit board 300 is in the form of a fifth conductive pattern, i.e., a flower pattern.

[0062] Combined with the above, the MIMO antenna provided by the embodiment of the present application has the following beneficial effects:

[0063] (1) The MIMO antenna of the embodiment of the present application can achieve multi-band broadband characteristics under antenna miniaturization. In contrast, traditional MIMO vehicle-mounted antennas usually have a single antenna unit that meets a single frequency band, resulting in a relatively large overall antenna size. The MIMO antenna of the embodiment of the present application adopts a compact / multi-frequency antenna unit. Both of the two 4G antennas can simultaneously meet the requirements of the 2G / 3G / LTE frequency bands, and all four 5G antennas meet the requirements of the three 5G frequency bands of N41 / N78 / N79. One WiFi / Bluetooth antenna can meet the requirements of the WiFi / Bluetooth frequency bands.

[0064] (2) The MIMO antenna of the embodiment of the present application can achieve good impedance matching performance of the antenna. Compared with traditional antennas that enhance impedance matching performance by expanding the size of the ground and adding parasitic patches, the MIMO antenna of the embodiment of the present application realizes good impedance matching performance of the antenna by extending a stepped impedance resonator on the ground. Moreover, a stepped impedance resonator with a leaf-shaped parasitic patch is adopted. By adjusting the size of the stepped impedance resonator, the antenna bandwidth can be better adjusted, improving the frequency selectivity and design flexibility of the antenna, thereby achieving the multi-frequency broadband required for 4G antennas. In addition, by placing an artificial magnetic conductor structure above two 5G antennas (the second antenna and the third antenna), the bandwidth performance is improved, enabling the antenna to still achieve a relatively wide bandwidth under a compact structure. The WiFi / Bluetooth antenna (the first antenna) realizes the required broadband performance through a coplanar waveguide structure.

[0065] (3) The MIMO antenna of the embodiment of the present application can achieve good isolation performance of the antenna. In the past, traditional antennas with a compact structure usually could not achieve good isolation performance, or could only enhance the isolation performance by increasing the antenna size. The MIMO antenna of the embodiment of the present application enhances the isolation performance of the antenna through a metallized isolation band. The isolation band is designed in a fence shape, mainly used to improve the isolation between the WiFi antenna (the first antenna) and the 5G antenna (the second antenna), as well as between two 5G antennas (the second antenna 2 and the third antenna).

[0066] (4) The MIMO antenna of the embodiment of the present application can achieve good radiation pattern performance. Compared with traditional vehicle-mounted antennas that often do not pay attention to the antenna radiation pattern and antenna cross-polarization performance, but only focus on the antenna bandwidth and radiation efficiency, the MIMO antenna of the embodiment of the present application realizes better radiation performance by adjusting the position layout of the antenna elements. Two 5G antennas (the second antenna and the third antenna) are placed on the second circuit board, and another two 5G antennas (the fourth antenna and the fifth antenna) are vertically placed on the first circuit board, which makes the radiation ranges of the 5G antennas complementary and the radiation effect better. Two 4G antennas (the sixth antenna and the seventh antenna) are placed at the diagonal ends of the first circuit board, enhancing the radiation performance of the antenna.

[0067] (5) The MIMO antenna of the embodiment of the present application can achieve the artistic design of the antenna. In the past, antennas were basically in relatively regular traditional shapes, with serious homogenization. The MIMO antenna of the embodiment of the present application performs artistic processing on each antenna element and forms a garden theme. Among them, the WiFi antenna is designed in the shape of a peach, the 5G antenna is designed in the shape of a structure combining grass and trees, the 4G antenna is designed in the shape of a combination of grass, bamboo and a gazebo, and the artificial magnetic conductor structure is designed in the shape of a flower cluster composed of a large number of flowers.

[0068] Figure 5 The curve diagram of the loss and gain of the first antenna according to an embodiment of the present application. As Figure 5 shown, in the frequency bands of 2.4 - 2.5 GHz and 5.15 - 5.85 GHz, the antenna return loss is less than -6 dB, which can fully cover the WiFi / Bluetooth frequency bands, and the antenna gain is about 5 dB, which can meet the good radiation performance.

[0069] Figure 6 The curve diagram of the loss of the 5G antenna according to an embodiment of the present application. Figure 7 The curve diagram of the gain of the 5G antenna according to an embodiment of the present application. Among them, S22 and Port2 represent the second antenna, S33 and Port3 represent the third antenna, S44 and Port4 represent the fourth antenna, and S55 and Port5 represent the fifth antenna. As Figure 6 and Figure 7 shown, in the frequency bands of 2.5 - 2.7 GHz, 3.3 - 3.8 GHz, and 4.4 - 5.0 GHz, the antenna return loss is less than -6 dB, which can cover three 5G frequency bands of N41, N78, and N79, and the antenna gain can also meet the performance requirements.

[0070] Figure 8 The curve diagram of the loss and gain of the 4G antenna according to an embodiment of the present application. Among them, the curve with triangles represents the sixth antenna, and the curve with squares represents the seventh antenna. As Figure 8 shown, in the frequency bands of 0.82 - 0.96 GHz and 1.69 - 2.7 GHz, the antenna return loss is less than -6 dB, which can cover the requirements of the 2G / 3G / LTE frequency bands, and the antenna gain can also meet the performance requirements.

[0071] Figure 9 The curve diagram of the antenna isolation according to an embodiment of the present application. Among them, S76 represents the isolation between the seventh antenna and the sixth antenna. S32 represents the isolation between the third antenna and the second antenna. S43 represents the isolation between the fourth antenna and the third antenna. S21 represents the isolation between the second antenna and the first antenna. As Figure 9 shown, the isolation between each antenna is below -18 dB, indicating that good isolation performance can be achieved within the bandwidth range when the antenna structure is compact.

[0072] Figure 10 The schematic diagram of the radiation direction of the first antenna according to an embodiment of the present application. As Figure 10 shown, the radiation direction of the first antenna reflects the good radiation performance of the overall antenna.

[0073] Figure 11 The schematic diagram of the radiation direction of the second antenna according to an embodiment of the present application. As Figure 11As shown, the radiation direction of the second antenna reflects the good radiation performance of the overall antenna.

[0074] Figure 12 This is a schematic diagram of the radiation direction of the third antenna according to an embodiment of the present application. As Figure 12 shown, the radiation direction of the third antenna reflects the good radiation performance of the overall antenna.

[0075] Figure 13 This is a schematic diagram of the radiation direction of the fourth antenna according to an embodiment of the present application. As Figure 13 shown, the radiation direction of the fourth antenna reflects the good radiation performance of the overall antenna.

[0076] Figure 14 This is a schematic diagram of the radiation direction of the fifth antenna according to an embodiment of the present application. As Figure 14 shown, the radiation direction of the fifth antenna reflects the good radiation performance of the overall antenna.

[0077] Figure 15 This is a schematic diagram of the radiation direction of the sixth antenna according to an embodiment of the present application. As Figure 15 shown, the radiation direction of the sixth antenna reflects the good radiation performance of the overall antenna.

[0078] Figure 16 This is a schematic diagram of the radiation direction of the seventh antenna according to an embodiment of the present application. As Figure 16 shown, the radiation direction of the seventh antenna reflects the good radiation performance of the overall antenna.

[0079] As Figures 11 to 14 shown, the radiation directions between the 4 5G antennas form a complementarity, which can enhance the radiation performance of the antenna.

[0080] As Figures 15 to 16 shown, the layout positions of the 2 4G antennas can also enhance the radiation performance of the antenna.

[0081] In a second aspect, an embodiment of the present application provides a vehicle-mounted antenna device, including the MIMO antenna as described in the first aspect.

[0082] Since the vehicle-mounted antenna device has the MIMO antenna of any of the foregoing embodiments, therefore, the vehicle-mounted antenna device can produce the beneficial effects of the MIMO antenna of the corresponding embodiment, that is, improve the radiation performance of the antenna and meet the requirements of the vehicle networking for higher transmission rate and lower latency.

[0083] The foregoing is only a partial embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made using the content of this specification and the drawings is similarly included in the patent protection scope of the present application.

[0084] In the absence of further limitations, an element qualified by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element. In addition, components, features, and elements with the same name in different embodiments may have the same meaning or different meanings, and their specific meanings need to be determined based on their explanations in the specific embodiment or further in combination with the context in the specific embodiment.

[0085] The terms "or" and "and / or" are interpreted inclusively and mean any one or any combination. This definition has exceptions only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

Claims

1. A MIMO antenna, characterized in that, It includes a first circuit board, a second circuit board, and a third circuit board disposed between the first circuit board and the second circuit board; On the second circuit board, there are a first antenna operating in a first frequency band, a second antenna operating in a second frequency band, and a third antenna operating in a third frequency band; On the first circuit board, there are a fourth antenna operating in a fourth frequency band, a fifth antenna operating in a fifth frequency band, a sixth antenna operating in a sixth frequency band, and a seventh antenna operating in a seventh frequency band; On the third circuit board, there is an artificial magnetic conductor structure; Among them, the first antenna is a WiFi / Bluetooth antenna and operates in the WiFi / Bluetooth frequency band; The second antenna, the third antenna, the fourth antenna, and the fifth antenna are 5G antennas and operate in the N41 and / or N78 and / or N79 frequency bands; The sixth antenna and the seventh antenna are 4G antennas and operate in the 2G / 3G / LTE frequency band; Moreover, the fourth antenna and the fifth antenna are orthogonally and vertically distributed with respect to the second antenna and the third antenna. The first antenna uses a coplanar waveguide structure. The sixth antenna and the seventh antenna use a stepped impedance resonator structure. The sixth antenna and the seventh antenna are distributed at the diagonals of the first circuit board, and the fourth antenna and the fifth antenna are distributed at the other diagonals of the first circuit board.

2. The MIMO antenna according to claim 1, characterized in that, A first isolation band is provided between the first antenna and the second antenna, and a second isolation band is provided between the second antenna and the third antenna.

3. The MIMO antenna according to claim 1, characterized in that, The second antenna and the third antenna are fed through a pad structure.

4. The MIMO antenna according to claim 2, wherein The first antenna is in a first conductive pattern, the second antenna and the third antenna are in a second conductive pattern, the fourth antenna and the fifth antenna are in a third conductive pattern, the sixth antenna and the seventh antenna are in a fourth conductive pattern, the artificial magnetic conductor structure is in a fifth conductive pattern, and the first isolation band and the second isolation band are in a sixth conductive pattern.

5. A vehicle-mounted antenna device, characterized in that, It includes the MIMO antenna according to any one of claims 1 to 4.

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