A multi-frequency transparent MIMO antenna for vehicle-mounted communications

Abstract

The present invention discloses a multi-frequency transparent MIMO antenna for vehicle-mounted communication, which belongs to the field of vehicle-mounted communication and includes a dielectric substrate, on which a first antenna radiating unit and a second antenna radiating unit are symmetrically mounted, a decoupling structure is provided between the first antenna radiating unit and the second antenna radiating unit, and the first antenna radiating unit, the second antenna radiating unit and the decoupling structure are all located on the same plane of the upper surface of the dielectric substrate. The present invention adopts the above-mentioned multi-frequency transparent MIMO antenna for vehicle-mounted communication, combines transparent materials and MIMO technology, and has a good decoupling effect, aiming to provide a solution that can meet the needs of efficient wireless communication and can be seamlessly integrated with the surrounding environment, and can achieve coverage of multiple frequency bands and meet the needs of multi-functional vehicle-mounted communication.

Description

Technical Field

[0001] The invention relates to the field of vehicle-mounted communications, and in particular to a multi-frequency transparent MIMO antenna for vehicle-mounted communications. Background Art

[0002] In recent years, with the popularization and rapid development of fifth-generation communication technology, emerging fields such as the Internet of Things and the Internet of Vehicles have also put forward higher requirements for antennas. The diversification of antenna application scenarios has also brought new challenges to antennas. Especially in the field of vehicle-mounted communications, with the development of autonomous driving technology, higher requirements have been put forward for vehicle-mounted communication antennas. Currently, traditional antennas are usually designed and manufactured based on metal or other opaque materials, which do not meet the aesthetic and functional requirements in environments where visual transparency is required.

[0003] At the same time, as an important interactive component between automotive wireless communication and external wireless communication, the excellent performance of the vehicle antenna will directly affect the quality of vehicle communication. The complex environment of the vehicle also brings challenges to wireless communication. Multiple Input Multiple Output (MIMO) antenna technology is a wireless communication technology that improves the capacity and transmission quality of wireless communication systems by using multiple transmitting and receiving antennas. MIMO antenna technology can cope with these challenges well. However, since MIMO technology relies on multiple antenna units to work together, if the coupling between multiple antennas is strong, it will also lead to performance degradation. Therefore, the decoupling of MIMO antennas is also very important.

[0004] As vehicles become more intelligent, the demands for performance and aesthetics of vehicle communication systems are also increasing. Traditional vehicle communication antennas often occupy the surface of the vehicle body and affect the appearance, and the utilization rate of the window glass surface is limited. Based on this, transparent glass antennas have become a new solution.

[0005] Traditional single vehicle-mounted antennas can only cover one frequency band, and multiple antennas are needed to meet multi-functional communication needs. At the same time, existing antennas can rarely cover the entire 0.82GHz-0.96GHz and 1.7GHz-6GHz operating frequency bands.

[0006] Since MIMO technology relies on multiple antenna units working together, if the coupling between multiple antennas is strong, it will lead to performance degradation, so the decoupling of MIMO antennas is also very important. Therefore, it is urgent to develop a transparent MIMO antenna with multi-frequency, high isolation, beautiful appearance and good hiding effect. Summary of the invention

[0007] The purpose of the present invention is to provide a multi-frequency transparent MIMO antenna for vehicle-mounted communications, which combines transparent materials and MIMO technology to achieve good decoupling effect. It aims to provide a solution that can not only meet the needs of efficient wireless communication but also seamlessly integrate with the surrounding environment. It can achieve coverage of multiple frequency bands and meet the needs of multi-functional vehicle-mounted communications.

[0008] To achieve the above-mentioned objectives, the present invention provides a multi-frequency transparent MIMO antenna for vehicular communication, comprising a dielectric substrate, on which a first antenna radiating unit and a second antenna radiating unit are symmetrically mounted, a decoupling structure is provided between the first antenna radiating unit and the second antenna radiating unit, and the first antenna radiating unit, the second antenna radiating unit and the decoupling structure are all located on the same plane on the upper surface of the dielectric substrate.

[0009] Preferably, the dielectric substrate is a rectangular parallelepiped, the dielectric substrate is made of organic glass material, the dielectric constant of the dielectric substrate is 6.05 and the tangent loss angle is 0.05.

[0010] Preferably, the feeding form of the first antenna radiating unit and the second antenna radiating unit are both coplanar waveguide feeding; the first antenna radiating unit, the second antenna radiating unit and the decoupling structure are all made of a metal mesh film material with a surface resistance of 0.15Ω / sq.

[0011] Preferably, the first antenna radiation unit is divided into a first radiation surface, a second radiation surface, a third radiation surface, a fourth radiation surface, a fifth radiation surface, a sixth radiation surface, a seventh radiation surface, and an eighth radiation surface according to the area; a first reference ground and a second reference ground are respectively provided on both sides of the first radiation surface; and the decoupling structure is composed of the second reference ground, the third reference ground, the fourth reference ground, the first L-shaped ground branch node, the second L-shaped ground branch node and the fifth reference ground.

[0012] Preferably, the first reference ground, the decoupling structure and the first radiating surface constitute a coplanar waveguide feeding structure of the first antenna radiating unit; there is a gap between the first radiating surface and the first reference ground; there is a gap between the first radiating surface and the decoupling structure; the second radiating surface is obtained by rectangular cutting, the first radiating surface is tightly fitted with the second radiating surface, the second radiating surface is tightly fitted with the third radiating surface; the fifth radiating surface, the seventh radiating surface and the eighth radiating surface are all tightly fitted with the sixth radiating surface.

[0013] Preferably, the first radiating surface, the second radiating surface, the third radiating surface and the seventh radiating surface are all rectangular, and the fourth radiating surface, the fifth radiating surface and the eighth radiating surface are all composed of a step-like figure formed by two rectangles; a second T-shaped slot is provided in the rectangle of the sixth radiating surface.

[0014] Preferably, the fourth radiation surface and the fifth radiation surface are both composed of step-like figures formed by two rectangles; and the second T-shaped slot is composed of a first gap and a second gap.

[0015] Preferably, the first reference ground, the second reference ground, the third reference ground and the fifth reference ground are all rectangular; the second reference ground is symmetrical to the third reference ground, a fourth reference ground is connected between the second reference ground and the third reference ground, and a first T-shaped slot is provided in the rectangle of the fourth reference ground.

[0016] Preferably, the second reference ground is tightly fitted with the first L-shaped grounding branch, the third reference ground is tightly fitted with the second L-shaped grounding branch, and the first L-shaped grounding branch and the second L-shaped grounding branch are symmetrically distributed; the six fifth reference grounds are located between the first L-shaped grounding branch and the second L-shaped grounding branch and are evenly distributed vertically in the vertical direction.

[0017] Therefore, the present invention adopts the above-mentioned multi-frequency transparent MIMO antenna for vehicle-mounted communications, combines transparent materials and MIMO technology, and has a good decoupling effect. It aims to provide a solution that can not only meet the needs of efficient wireless communications but also seamlessly integrate with the surrounding environment. It can achieve coverage of multiple frequency bands and meet the needs of multi-functional vehicle-mounted communications.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communication of the present invention;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communication of the present invention;

[0021] Figure 3 It is a cut and labeled schematic diagram of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communication of the present invention;

[0022] Figure 4 It is a detailed dimension diagram of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communication of the present invention;

[0023] Figure 5 is a return loss curve diagram of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communications of the present invention;

[0024] Figure 6is an isolation curve diagram of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communications of the present invention;

[0025] Figure 7 It is a gain curve diagram of an embodiment of a multi-frequency transparent MIMO antenna for vehicle-mounted communications of the present invention.

[0026] Reference numerals

[0027] 1. First reference ground; 2. First radiation surface; 3. Second radiation surface; 4. Third radiation surface; 5. Fourth radiation surface; 6. Fifth radiation surface; 7. Sixth radiation surface; 8. Seventh radiation surface; 9. Eighth radiation surface; 10. First gap; 11. Second gap; 12. Second reference ground; 13. Third reference ground; 14. First L-shaped grounding branch; 15. Second L-shaped grounding branch; 16. Fourth reference ground; 17. First T-shaped slot; 18. Fifth reference ground; 19. Second T-shaped slot; 301. First antenna radiation unit; 302. Second antenna radiation unit; 303. Decoupling structure; 304. Dielectric substrate. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Embodiment 1

[0031] like Figures 1 to 3 As shown, the present invention provides a multi-frequency transparent MIMO antenna for vehicle-mounted communication, including a dielectric substrate 304, on which a first antenna radiating unit 301 and a second antenna radiating unit 302 are symmetrically mounted, a decoupling structure 303 is provided between the first antenna radiating unit 301 and the second antenna radiating unit 302, and the first antenna radiating unit 301, the second antenna radiating unit 302 and the decoupling structure 303 are all located on the same plane on the upper surface of the dielectric substrate 304.

[0032] The dielectric substrate 304 is a rectangular parallelepiped, and the dielectric substrate 304 is made of organic glass. The dielectric constant of the dielectric substrate 304 is 6.05 and the tangent loss angle is 0.05.

[0033] The feeding form of the first antenna radiation unit 301 and the second antenna radiation unit 302 are both coplanar waveguide feeding; the first antenna radiation unit 301, the second antenna radiation unit 302 and the decoupling structure 303 are all made of a metal mesh film material with a surface square resistance of 0.15Ω / sq; the first T-shaped slot 17 in the decoupling structure 303 improves the current distribution of the floor by means of a defective ground, which has a decoupling effect on the MIMO antenna structure, thereby improving the isolation of the high frequency in the antenna.

[0034] It should be noted that Figure 3 The dotted lines in the figure are for the convenience of understanding and are not the content of the antenna itself. For the convenience of description, the first antenna radiation unit 301 is divided into the first radiation surface 2, the second radiation surface 3, the third radiation surface 4, the fourth radiation surface 5, the fifth radiation surface 6, the sixth radiation surface 7, the seventh radiation surface 8, and the eighth radiation surface 9; the first radiation surface 2 is provided with a first reference ground 1 and a second reference ground 12 on both sides; the decoupling structure 303 is composed of the second reference ground 12, the third reference ground 13, the fourth reference ground 16, the first L-shaped ground branch 14, the second L-shaped ground branch 15 and the fifth reference ground 18.

[0035] The first reference ground 1, the decoupling structure 303 and the first radiating surface 2 constitute a coplanar waveguide feeding structure of the first antenna radiating unit 301; the second radiating surface 3 is obtained by cutting the corners of a rectangle, the first radiating surface 2 is tightly fitted with the second radiating surface 3, and the second radiating surface 3 is tightly fitted with the third radiating surface 4; the fifth radiating surface 6, the seventh radiating surface 8, and the eighth radiating surface 9 are all tightly fitted with the sixth radiating surface 7.

[0036] like Figure 4 As shown, the dielectric substrate 304 has a length of 135 mm, a width of 80 mm, and a thickness of 1.5 mm;

[0037] The first radiation surface 2 is 0.5 mm away from the first reference ground 1;

[0038] The first radiation surface 2 is 0.5 mm away from the decoupling structure 303;

[0039] The first radiation surface 2 is a rectangle with a length of 16 mm and a width of 2 mm;

[0040] The second radiation surface 3 is a trapezoid with an upper base length of 31 mm, a lower base length of 9 mm, and a height of 11 mm;

[0041] The third radiation surface 4 is a rectangle with a length of 31 mm and a width of 8 mm;

[0042] The fourth radiation surface 5 is composed of a rectangle with a length of 16.5 mm and a width of 4.5 mm and a rectangle with a length of 20 mm and a width of 3 mm;

[0043] The fifth radiation surface 6 is composed of a rectangle with a length of 9.5 mm and a width of 4 mm and a rectangle with a length of 15 mm and a width of 5.5 mm;

[0044] The sixth radiation surface 7 is a rectangle with a length of 31 mm and a width of 25.5 mm, and a second T-shaped slot 19 is provided in the rectangle;

[0045] The seventh radiation surface 8 is a rectangle with a length of 12.5 mm and a width of 4.5 mm;

[0046] The eighth radiation surface 9 is a step-like pattern consisting of a rectangle with a length of 10 mm and a width of 2.5 mm and another rectangle with a length of 16 mm and a width of 4 mm.

[0047] The fourth radiation surface 5 and the fifth radiation surface 6 are step-like figures, which can be divided into two rectangles; the second T-shaped slot 19 is composed of a first gap 10 and a second gap 11; the first gap 10 is a rectangle with a length of 15 mm and a width of 2 mm; the second gap 11 is a rectangle with a length of 19.5 mm and a width of 5 mm.

[0048] The first reference ground 1 is a rectangle with a length of 15 mm and a width of 25 mm; the third reference ground 13 is symmetrical to the second reference ground 12, and the second reference ground 12 and the third reference ground 13 are both rectangles with a length of 15 mm and a width of 15 mm; a fourth reference ground 16 is connected between the second reference ground 12 and the third reference ground 13; the fourth reference ground 16 is a rectangle with a length of 47 mm and a width of 11 mm, and a first T-shaped slot 17 is provided in the rectangle; the first T-shaped slot 17 is composed of a rectangle with a length of 20 mm and a width of 5 mm and a rectangle with a length of 46 mm and a width of 3 mm.

[0049] The second reference ground 12 is closely fitted with the first L-shaped grounding branch 14, the third reference ground 13 is closely fitted with the second L-shaped grounding branch 15, and the first L-shaped grounding branch 14 and the second L-shaped grounding branch 15 are symmetrically distributed; the fifth reference ground 18 is composed of six rectangles with a length of 12 mm and a width of 2 mm, and the six rectangles are located between the first L-shaped grounding branch 14 and the second L-shaped grounding branch 15 and are evenly distributed vertically along the vertical direction. The six rectangles of the first L-shaped grounding branch 14, the second L-shaped grounding branch 15 and the middle fifth reference ground 18 improve the isolation of the low-frequency band in the MIMO antenna.

[0050] like Figure 5As shown, since the first antenna radiation unit 301 and the second antenna radiation unit 302 are symmetrically distributed, the S22 curve graph and the S11 curve graph basically overlap. The return losses of the two antennas at 0.82GHz-0.96GHz and 1.7GHz-6GHz are both less than -10dB, indicating that the antennas can cover communication standards such as GSM850, GSM900, DCS, PCS, UMTS, LTE, 5G, and V2X.

[0051] like Figure 6 As shown in the figure, the isolation of the transparent MIMO antenna is less than -15dB in the working frequency bands of 0.82GHz-0.96GHz and 1.7GHz-6GHz, which shows that the antenna has a good decoupling effect.

[0052] like Figure 7 As shown, the gain of the transparent MIMO antenna is greater than 1dB within the working frequency band.

[0053] Therefore, the multi-frequency transparent MIMO antenna for vehicle-mounted communication proposed in the present invention uses a metal mesh film material with high light transmittance as the radiation unit and reference ground of the antenna, and processes the transparent film on a glass substrate to realize a multifunctional vehicle-mounted transparent MIMO antenna on a vehicle window glass, which has the following beneficial effects:

[0054] (1) The use of transparent metal mesh film materials and transparent glass substrates makes the multi-band vehicle-mounted transparent MIMO antenna highly transparent and can be integrated into the car window glass to achieve an integrated car design, enhancing the car's aesthetics and integrity. At the same time, the high transparency also makes it easier to hide the antenna itself, without being limited by the size and space limitations of traditional antennas.

[0055] (2) It can cover multiple vehicle communication frequency bands. The return loss of the transparent MIMO antenna is less than -10dB at 0.82GHz-0.96GHz and 1.7GHz-6GHz. It can work stably in the 0.82GHz-0.96GHz and 1.7GHz-6GHz working frequency bands, covering multiple frequency bands required for 2g, 3g, 4g, 5g, v2x and other functions.

[0056] (3) The isolation is less than -15dB within the working frequency band. The MIMO antenna has good decoupling effect and achieves high isolation of the MIMO antenna.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A multi-frequency transparent MIMO antenna for vehicle-mounted communications, characterized in that: The device comprises a dielectric substrate, the dielectric substrate is made of organic glass material, a first antenna radiating unit and a second antenna radiating unit are symmetrically mounted on the dielectric substrate, a decoupling structure is arranged between the first antenna radiating unit and the second antenna radiating unit, the first antenna radiating unit, the second antenna radiating unit and the decoupling structure are all located on the same plane of the upper surface of the dielectric substrate, and the feeding form of the first antenna radiating unit and the second antenna radiating unit is coplanar waveguide feeding; The first antenna radiation unit is divided into a first radiation surface, a second radiation surface, a third radiation surface, a fourth radiation surface, a fifth radiation surface, a sixth radiation surface, a seventh radiation surface, and an eighth radiation surface according to the region; a first reference ground and a second reference ground are respectively provided on both sides of the first radiation surface; the decoupling structure is composed of the second reference ground, the third reference ground, the fourth reference ground, a first L-shaped grounding branch, a second L-shaped grounding branch and a fifth reference ground, the second reference ground is tightly fitted with the first L-shaped grounding branch, the third reference ground is tightly fitted with the second L-shaped grounding branch, and the first L-shaped grounding branch is symmetrically distributed with the second L-shaped grounding branch; the second reference ground is symmetrical with the third reference ground, a fourth reference ground is connected between the second reference ground and the third reference ground, and a first T-shaped slot is provided in the rectangle of the fourth reference ground; the six fifth reference grounds are located between the first L-shaped grounding branch and the second L-shaped grounding branch and are evenly distributed vertically along the vertical direction.

2. The multi-frequency transparent MIMO antenna for vehicle-mounted communication according to claim 1, characterized in that: The dielectric substrate is a rectangular parallelepiped, and the dielectric constant of the dielectric substrate is 6.05 and the tangent loss angle is 0.

05.

3. The multi-frequency transparent MIMO antenna for vehicle-mounted communication according to claim 1, characterized in that: The first antenna radiation unit, the second antenna radiation unit and the decoupling structure are all made of a metal mesh film material with a surface resistance of 0.15Ω / sq.

4. The multi-frequency transparent MIMO antenna for vehicle-mounted communication according to claim 1, characterized in that: The first reference ground, the decoupling structure and the first radiating surface constitute a coplanar waveguide feeding structure of a first antenna radiating unit; there is a gap between the first radiating surface and the first reference ground; There is a gap between the first radiation surface and the decoupling structure; The second radiating surface is obtained by cutting corners of a rectangle, the first radiating surface is closely fitted with the second radiating surface, and the second radiating surface is closely fitted with the third radiating surface; the fifth radiating surface, the seventh radiating surface, and the eighth radiating surface are all closely fitted with the sixth radiating surface.

5. The multi-frequency transparent MIMO antenna for vehicle-mounted communication according to claim 1, characterized in that: The first radiation surface, the second radiation surface, the third radiation surface and the seventh radiation surface are all rectangular, the fourth radiation surface, the fifth radiation surface and the eighth radiation surface are all composed of a step-like figure formed by two rectangles; the rectangle of the sixth radiation surface is provided with a second T-shaped slot.

6. The multi-frequency transparent MIMO antenna for vehicle-mounted communications according to claim 5, characterized in that: The fourth radiation surface and the fifth radiation surface are both composed of step-like figures formed by two rectangles; the second T-shaped slot is composed of a first gap and a second gap.

7. The multi-frequency transparent MIMO antenna for vehicle-mounted communication according to claim 1, characterized in that: The first reference ground, the second reference ground, the third reference ground and the fifth reference ground are all rectangular.

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