Compact MIMO antenna module mounted on vehicle

Abstract

The utility model discloses a compact MIMO antenna module carried on a vehicle, which comprises a first circuit board and two antenna units arranged oppositely, the outer side of a second circuit board is provided with an antenna radiator, the lower part of the inner side of the second circuit board is provided with a rectangular ground layer, and the rectangular ground layer is arranged close to the first circuit board; the antenna radiator comprises a transmission feeder line, an arc-shaped radiation branch knot and a rectangular radiation branch knot which are sequentially connected from bottom to top, a first gap and a second gap are further formed in the antenna radiator, the first gap is in an n shape as a whole, an opening of the first gap deviates from the rectangular radiation branch knot, a part of area of the first gap is located on the transmission feeder line, and a part of area of the second gap is located on the rectangular radiation branch knot. The other part of the first gap is located on the arc-shaped radiation branch knot, and the second gap is in an inverted T shape and is arranged on the rectangular radiation branch knot. The MIMO antenna module is compact in structure, can be effectively applied to the working frequency bands from 1.71 GHz to 5 GHz, and also has the characteristics of high isolation, low cost and easiness in production.

Description

Technical Field

[0001] The utility model relates to the technical field of communication, and in particular to a compact MIMO antenna module mounted on a vehicle. Background Art

[0002] The existing technology for realizing automotive communication requires multiple antennas of different frequency bands to be placed in the shark fin antenna box at the same time. For industry researchers, the size limitation of the antenna box and the coupling between antennas are huge challenges, and it is difficult to achieve the performance standards of radiation efficiency and isolation of the multiple input and output (MIMO) communication system. At the same time, a single antenna is responsible for the input and output of a working frequency band, which cannot support the high information throughput requirements of modern automotive communication networks. Utility Model Content

[0003] The technical problem solved by the utility model is: to provide a compact MIMO antenna module mounted on a vehicle, which can achieve full coverage of the Sub-6 5G communication frequency band of 1.71GHz-5GHz.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a compact MIMO antenna module mounted on a vehicle, comprising a first circuit board and two antenna units arranged opposite to each other, the antenna unit comprising a second circuit board perpendicular to the first circuit board, an antenna radiator is provided on the outer side of the second circuit board, a rectangular stratum is provided on the lower part of the inner side of the second circuit board, and the rectangular stratum is arranged close to the first circuit board; the antenna radiator comprises a transmission feeder, an arc-shaped radiation branch and a rectangular radiation branch connected in sequence from bottom to top, and a first gap and a second gap are also provided on the antenna radiator, the first gap is in a "J" shape as a whole, the opening of the first gap is away from the rectangular radiation branch, a part of the first gap is located on the transmission feeder, and another part of the first gap is located on the arc-shaped radiation branch, the second gap is in an inverted T-shape, the second gap is arranged on the rectangular radiation branch, and the second gap connects the side of the rectangular radiation branch away from the transmission feeder.

[0005] In one embodiment, the antenna radiator is a bilaterally symmetrical structure.

[0006] In one embodiment, the connection between the arc-shaped radiation branch and the transmission feeder is located at the top of the arc of the arc-shaped radiation branch.

[0007] In one embodiment, the first gap includes a first branch, a second branch, a third branch, a fourth branch and a fifth branch that are vertically connected in sequence, the first branch is symmetrical with the fourth branch, the second branch is symmetrical with the fourth branch, and the third branch is located in the arc-shaped radial branch.

[0008] In one embodiment, the width of the first branch is equal to the width of the second branch, and the length of the first branch is less than the length of the second branch.

[0009] In one embodiment, the length of the third branch node is greater than the length of the first branch node and less than the length of the second branch node, and the width of the third branch node is greater than the width of the first branch node.

[0010] In one embodiment, the second slot includes a sixth branch and a seventh branch vertically connected, the sixth branch connects to the side of the rectangular radiation branch away from the transmission feeder, and the connection between the sixth branch and the seventh branch is located at the midpoint of the seventh branch.

[0011] In one embodiment, the width of the seventh branch is smaller than the width of the sixth branch, the length of the seventh branch is greater than the width of the sixth branch, and the length of the seventh branch is greater than the length of the sixth branch.

[0012] In one embodiment, the upper edge of the rectangular formation is arranged lower than the arc-shaped radiation branches.

[0013] In one embodiment, the antenna radiator is printed on the second circuit board.

[0014] The beneficial effects of the utility model are:

[0015] This MIMO (multiple input multiple output) antenna module consists of two symmetrically placed monopole antenna units. It has a compact structure and can be placed in a small T-BOX (shark fin). It can receive and send information in the same frequency band, increase information transmission channels, and thus increase information throughput without increasing transmission power and expanding transmission bandwidth. It can be effectively applied to the operating frequency band of 1.71GHz to 5GHz in Sub-6GHz 5G systems.

[0016] The antenna radiator has a first slot and a second slot, which effectively reduces the occupied area required for the low-frequency radiation of the antenna and facilitates further miniaturization of the antenna unit.

[0017] The antenna unit has a localized formation area design, which improves bandwidth and impedance while achieving high isolation within the operating frequency range.

[0018] This MIMO antenna module has the characteristics of high isolation, low cost and easy production, and can be widely used in T-BOX automotive communication equipment to realize information transmission and share traffic information. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 is a schematic structural diagram of a compact MIMO antenna module mounted on a vehicle according to this embodiment;

[0021] Figure 2 is a perspective view of an antenna unit in a compact MIMO antenna module mounted on a vehicle according to the present embodiment;

[0022] Figure 3 is a simulated S-parameter diagram of the compact MIMO antenna module mounted on a vehicle according to the present embodiment;

[0023] Figure 4 is an antenna efficiency diagram of a compact MIMO antenna module mounted on a vehicle according to the present embodiment;

[0024] Figure 5 This is the radiation pattern of the compact MIMO antenna module mounted on a vehicle of this embodiment when operating at 1.7 GHz;

[0025] Figure 6 The radiation pattern of the compact MIMO antenna module mounted on a vehicle of this embodiment when operating at 2.7 GHz;

[0026] Figure 7 The radiation pattern of the compact MIMO antenna module mounted on a vehicle of this embodiment when operating at 3.3 GHz;

[0027] Figure 8 This is the radiation pattern of the compact MIMO antenna module mounted on a vehicle of this embodiment when operating at 5 GHz;

[0028] Fig. 9 is an isolation curve diagram of the compact MIMO antenna module mounted on a vehicle according to the present embodiment;

[0029] Fig.10 FIG. 4 is an envelope correlation coefficient diagram of the compact MIMO antenna module mounted on a vehicle according to the present embodiment.

[0030] Description of Figure Numbers:

[0031] 1. The first circuit board;

[0032] 2. The second circuit board;

[0033] 3. Antenna radiator; 31. Transmission feeder; 32. Arc-shaped radiation branch; 33. Rectangular radiation branch; 34. First slot; 341. First branch; 342. Second branch; 343. Third branch; 344. Fourth branch; 345. Fifth branch; 35. Second slot; 351. Sixth branch; 352. Seventh branch;

[0034] 4. Rectangular formation. DETAILED DESCRIPTION

[0035] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or and solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Example

[0042] Please refer to Figures 1 to 10 , an embodiment of the utility model is: a compact MIMO antenna module mounted on a vehicle, which can be installed in a T-BOX and a shark fin of the vehicle.

[0043] like Figure 1 and Figure 2 As shown, a compact MIMO antenna module mounted on a vehicle comprises a first circuit board 1 and two antenna units arranged opposite to each other, wherein the antenna unit comprises a second circuit board 2 perpendicular to the first circuit board 1, an antenna radiator 3 is arranged on the outer side of the second circuit board 2, and the antenna radiator 3 is a bilaterally symmetrical structure, a rectangular layer 4 is arranged at the lower part of the inner side of the second circuit board 2, and the rectangular layer 4 is arranged close to the first circuit board 1, and optionally, the rectangular layer 4 is in contact and conductive with the layer on the first circuit board 1; the antenna radiator 3 comprises a transmission feeder 31, an arc-shaped radiation layer 32 connected in sequence from bottom to top, and a transmission feeder 31 connected in sequence from bottom to top. The antenna radiator 3 further comprises a first slit 34 and a second slit 35, wherein the first slit 34 is in a "J" shape as a whole, and the opening of the first slit 34 is away from the rectangular radiating branch 33. A portion of the first slit 34 is located on the transmission feeder 31, and another portion of the first slit 34 is located on the arc-shaped radiating branch 32. The second slit 35 is in an inverted T-shape, and the second slit 35 is arranged on the rectangular radiating branch 33. The second slit 35 connects the side of the rectangular radiating branch 33 away from the transmission feeder 31.

[0044] The existence of the first slot 34 and the second slot 35 enables the antenna unit to cover the low frequency bandwidth in a limited space. The setting of the arc-shaped radiation branch 32 can reduce the loss of the antenna unit in the high frequency band, and the transition using the arc-shaped radiation branch 32 can also reduce the signal loss caused by impedance mismatch.

[0045] Specifically, the connection between the arc-shaped radiation branch 32 and the transmission feeder 31 is located at the top of the arc of the arc-shaped radiation branch 32 .

[0046] In this embodiment, the first gap 34 includes a first branch 341, a second branch 342, a third branch 343, a fourth branch 344 and a fifth branch 345 which are vertically connected in sequence. The first branch 341 is symmetrical with the fourth branch 344, the second branch 342 is symmetrical with the fourth branch 344, and the third branch 343 is located in the arc-shaped radiating branch 32. Optionally, the width of the first branch 341 is equal to the width of the second branch 342, the length of the first branch 341 is less than the length of the second branch 342, the length of the third branch 343 is greater than the length of the first branch 341 and less than the length of the second branch 342, and the width of the third branch 343 is greater than the width of the first branch 341.

[0047] The second slot 35 includes a sixth branch 351 and a seventh branch 352 which are vertically connected, the sixth branch 351 is connected to the side of the rectangular radiation branch 33 away from the transmission feeder 31, and the connection between the sixth branch 351 and the seventh branch 352 is located at the midpoint of the seventh branch 352. Optionally, the width of the seventh branch 352 is smaller than the width of the sixth branch 351, the length of the seventh branch 352 is greater than the width of the sixth branch 351, and the length of the seventh branch 352 is greater than the length of the sixth branch 351.

[0048] The upper edge of the rectangular formation 4 is arranged lower than the arc-shaped radiation branches 32 .

[0049] The antenna radiator 3 is printed on the second circuit board 2. Optionally, the material of the second circuit board 2 is FR-4, that is, the antenna unit can be a PCBA board, which can not only effectively control the manufacturing cost of the MIMO antenna module, but also facilitate the assembly of the MIMO antenna module.

[0050] In this embodiment, the second circuit board has a height of 28 mm, a width of 27 mm, a thickness of 1 mm, and a dielectric constant ε r =4.3, loss tangent tanδ=0.025. It can be seen that the second circuit board occupies a small space, ensuring that the MIMO antenna module can be compact, so that it can effectively adapt to the vehicle's T-BOX installation environment and shark fin installation environment. The rectangular formation has a length of 27mm, a height of 7.5mm, and a thickness of 0.035mm. As a local ground structure, the rectangular formation can reduce the coupling effect between antenna units in the MIMO antenna module, thereby improving the isolation performance between antennas.

[0051] Figure 3 is a simulated S-parameter diagram of the compact MIMO antenna module mounted on a vehicle in this embodiment, Figure 3It can be seen that the return loss of the compact MIMO antenna module is less than -6dB, and the compact MIMO antenna module can effectively cover the Sub-6 5G communication frequency band from 1.71GHz to 5GHz. By comparing the S parameters, it can be seen that the S parameters of the antenna can be effectively improved after adding the rectangular formation.

[0052] Figure 4 is an antenna efficiency diagram of the compact MIMO antenna module mounted on a vehicle according to this embodiment, Figure 4 It can be seen that the radiation characteristics of the MIMO antenna module with the rectangular layer added are significantly improved by more than 1dB compared with the MIMO antenna module without the rectangular layer. The MIMO antenna module has good radiation characteristics and can be applied to 5G automobile communication systems.

[0053] Figures 5 to 8 They are respectively the radiation patterns of the compact MIMO antenna module mounted on the vehicle according to this embodiment, such as Figures 5 to 8 As shown in the figure, the MIMO antenna module has good omnidirectionality in the Sub-6 5G communication frequency band from 1.71GHz to 5GHz, and the antenna radiator is an omnidirectional antenna at 1.7GHz, 2.7GHz, 3.3GHz, and 5GHz, and its gain can reach 2dBi, 52.7dBi, 3.8dBi, and 4.2dBi respectively. In other words, the MIMO antenna module has good omnidirectionality in the working frequency band.

[0054] Fig. 9 is an isolation curve diagram of the compact MIMO antenna module mounted on a vehicle in this embodiment, Fig. 9 It can be seen that the isolation of the MIMO antenna module with the rectangular formation added is below -15dB, and the improvement is most obvious in the low frequency case.

[0055] Fig.10 This is the envelope correlation coefficient diagram (ECC) of the compact MIMO antenna module mounted on a vehicle of this embodiment. From the ECC results, it can be seen that the ECC of the MIMO antenna module in the entire frequency band is less than 0.02, and the spatial multiplexing is good. Compared with the MIMO antenna module without the rectangular formation, the MIMO antenna module with the added rectangular formation effectively reduces the coupling effect and significantly improves the isolation between antenna units.

[0056] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A compact MIMO antenna module mounted on a vehicle, characterized in that: It includes a first circuit board and two antenna units arranged opposite to each other, the antenna unit includes a second circuit board perpendicular to the first circuit board, an antenna radiator is provided on the outer side of the second circuit board, a rectangular stratum is provided on the lower part of the inner side of the second circuit board, and the rectangular stratum is arranged close to the first circuit board; the antenna radiator includes a transmission feeder, an arc-shaped radiation branch and a rectangular radiation branch connected in sequence from bottom to top, and a first slot and a second slot are also provided on the antenna radiator, the first slot is in a "J" shape as a whole, the opening of the first slot is away from the rectangular radiation branch, a part of the first slot is located on the transmission feeder, and another part of the first slot is located on the arc-shaped radiation branch, the second slot is in an inverted T-shape, the second slot is arranged on the rectangular radiation branch, and the second slot connects the side of the rectangular radiation branch away from the transmission feeder.

2. The compact MIMO antenna module mounted on a vehicle according to claim 1, characterized in that: The antenna radiator has a bilaterally symmetrical structure.

3. The compact MIMO antenna module mounted on a vehicle according to claim 2, characterized in that: The connection point between the arc-shaped radiation branch and the transmission feeder is located at the arc top of the arc-shaped radiation branch.

4. The compact MIMO antenna module mounted on a vehicle according to claim 2, characterized in that: The first gap includes a first branch, a second branch, a third branch, a fourth branch and a fifth branch which are vertically connected in sequence. The first branch is symmetrical with the fourth branch, the second branch is symmetrical with the fourth branch, and the third branch is located in the arc-shaped radial branch.

5. The compact MIMO antenna module mounted on a vehicle according to claim 4, characterized in that: The width of the first branch node is equal to the width of the second branch node, and the length of the first branch node is shorter than the length of the second branch node.

6. The compact MIMO antenna module mounted on a vehicle according to claim 4, characterized in that: The length of the third branch node is greater than that of the first branch node and less than that of the second branch node, and the width of the third branch node is greater than that of the first branch node.

7. The compact MIMO antenna module mounted on a vehicle according to claim 2, characterized in that: The second slot includes a sixth branch and a seventh branch which are vertically connected, the sixth branch is connected to the side of the rectangular radiation branch away from the transmission feeder, and the connection between the sixth branch and the seventh branch is located at the midpoint of the seventh branch.

8. The compact MIMO antenna module mounted on a vehicle according to claim 7, characterized in that: The width of the seventh branch is smaller than the width of the sixth branch, the length of the seventh branch is larger than the width of the sixth branch, and the length of the seventh branch is larger than the length of the sixth branch.

9. The compact MIMO antenna module mounted on a vehicle according to claim 1, characterized in that: The upper edge of the rectangular formation is arranged lower than the arc-shaped radiation branches.

10. The compact MIMO antenna module mounted on a vehicle according to claim 1, characterized in that: The antenna radiator is printed on the second circuit board.

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