A multi-frequency broadband combined antenna applied to a vehicle-mounted environment

Abstract

The application discloses a multi-frequency broadband combined antenna applied to a vehicle-mounted environment, which comprises a circular reflecting floor, four 5G / 4G antenna units and six WIFI antenna units, the four 5G / 4G antenna units are placed at positions around the circular reflecting floor, and the six WIFI antenna units are dispersedly placed at positions in the middle of the circular reflecting floor according to a certain layout, the four 5G / 4G antenna units meet the requirements of traditional 2G / 3G / LTE / 5G frequency bands, and the six WIFI antenna units meet the requirements of 2.4 / 5.8GHz WiFi and Bluetooth frequency bands, so that the multi-frequency broadband performance is realized, and three isolation plates are further placed at the positions in the middle of the circular reflecting floor, so that the isolation performance between the antenna units is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication systems, in particular to a multi-frequency wideband combined antenna applied to a vehicle-mounted environment. BACKGROUND

[0002] In recent years, the development of 4G communication has encountered a bottleneck while achieving outstanding achievements. In terms of vehicle-mounted communication, it can meet the initial demand of vehicle networking, such as Bluetooth connection, real-time road conditions, etc. However, in the face of the requirements of 5G era communication, especially the demand of vehicle networking such as automatic driving which requires higher transmission rate and lower delay, the performance of 4G communication is difficult to meet the requirements. At the same time, due to various objective reasons, the layout of 5G base stations has not been completed in China at present, and 4G communication still occupies a dominant position, so 4G communication still has great value. In addition, in order to realize the interconnection of various communication devices in the vehicle, WiFi communication is also indispensable. In order to meet the requirements of 4G communication and 5G communication, and also cover the communication demand of WiFi frequency band, it has high value to design a multi-frequency wideband MIMO antenna applied to a vehicle-mounted environment.

[0003] Most of the MIMO (Multiple-Input Multiple-Output) vehicle-mounted antennas on the market can only cover 2G / 3G / LTE frequency bands, and the antenna units generally have narrow bandwidth and large overall antenna size, which is difficult to adapt to complex vehicle environments. Shark fin vehicle-mounted antennas are favored by the market due to their relatively attractive appearance, but the relatively fixed structure limits the number of antennas that can be accommodated, making it difficult to be compatible with 5G frequency bands and cope with the increasingly complex vehicle communication environment, which makes the compact vehicle-mounted box antenna have more application scenarios. Therefore, on the basis of covering 2G / 3G / LTE / WiFi / Bluetooth / 5G frequency band bandwidth, miniaturization is a major difficulty in the design of MIMO vehicle-mounted antennas. In addition, material selection and other issues cannot be ignored when designing antennas. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a multi-frequency wideband combined antenna applied to a vehicle-mounted environment, which can cover 0.62-0.96GHz, 1.4-1.5GHz, 1.7-2.7GHz, 3.3-3.8GHz, 4.4-5GHz, 2.4-2.5GHz, 5.15-5.85GHz multi-frequency band applications 2G / 3G / LTE / WiFi / Bluetooth / 5G MIMO vehicle-mounted antenna, with wide bandwidth, multi-frequency point, compact structure, low cost, artistic and other characteristics.

[0005] In order to achieve the above-mentioned purpose, the application provides a multi-frequency broadband combined antenna applied to a vehicle-mounted environment, which comprises a circular reflecting floor, four 5G / 4G antenna units and six WIFI antenna units, the four 5G / 4G antenna units are arranged around the top surface of the circular reflecting floor, wherein each of the 5G / 4G antenna units is vertically arranged and the upper surface thereof faces outward; the six WIFI antenna units are arranged at the middle position of the top surface of the circular reflecting floor, wherein each of the WIFI antenna units is vertically arranged, the upper surfaces of the WIFI antenna units all face the same direction and any two WIFI antenna units are not parallel; the middle position of the top surface of the circular reflecting floor is further provided with three isolation plates, each of which is arranged between two WIFI antenna units.

[0006] Further, each of the 5G / 4G antenna units comprises a first dielectric plate, a first radiation patch arranged on the upper surface of the first dielectric plate, and a first ground patch and a second ground patch arranged on the lower surface of the first dielectric plate, wherein the first radiation patch comprises a first stepped portion and a second stepped portion which are electrically connected to each other; the first ground patch and the second ground patch each comprise a third stepped portion and a fourth stepped portion which are electrically connected to each other, and the third stepped portions of the first ground patch and the second ground patch are both extended downward to be electrically connected to the circular reflecting floor to be grounded.

[0007] Further, the second stepped portion and the fourth stepped portion are bent strip lines.

[0008] Further, the projection areas of the first radiation patch, the first ground patch and the second ground patch do not overlap, and the heights of the first ground patch, the first radiation patch and the second ground patch are arranged in descending order.

[0009] Further, each of the WIFI antenna units comprises a second dielectric plate, a second radiation patch and a feeding patch arranged on the upper surface of the second dielectric plate, and a third radiation patch and a third ground patch arranged on the lower surface of the second dielectric plate, wherein the second radiation patch and the feeding patch are arranged in a top-down manner, and the third radiation patch and the third ground patch are arranged in a top-down manner; the two ends of the feeding patch pass through the second dielectric plate and are electrically connected to the third radiation patch and the third ground patch, respectively.

[0010] Further, the upper end of the feeding patch is electrically connected to the third radiation patch through a metalized through hole provided in the second dielectric plate.

[0011] Further, the top of the third ground patch is provided with a defect slot in the shape of an inverted triangle.

[0012] Further, the second radiation patch is in the shape of an inverted triangle.

[0013] Further, the third radiation patch is a quadrilateral structure.

[0014] The present application has the beneficial effects that: 1) by arranging four 5G / 4G antenna units on the circular reflecting floor to meet the traditional 2G / 3G / LTE / 5G frequency band requirements, and six WIFI antenna units to meet the 2.4 / 5.8GHz WIFI, Bluetooth frequency band requirements, thereby realizing multi-frequency broadband performance;

[0015] 2) the 5G / 4G antenna unit is designed by adopting the structure of the first radiation patch, the first ground patch and the second ground patch, which not only effectively reduces the profile height of the 5G / 4G antenna unit, but also keeps the antenna wide bandwidth;

[0016] 3) the WIFI antenna unit is excited by the metalized through hole on the upper and lower surfaces of the second dielectric plate, and the radiation patch of different size specifications is used to improve the bandwidth span of the antenna, realize wide bandwidth, and at the same time, a defect slot in the shape of an inverted triangle is arranged on the third ground patch, which realizes wider impedance bandwidth;

[0017] 4) by placing four 5G / 4G antenna units around the circular reflecting floor, six WIFI antenna units are placed in a certain layout in the middle position of the circular reflecting floor, and three isolation plates are placed in the middle position of the circular reflecting floor, thereby effectively improving the isolation performance between the antenna units. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the combined antenna.

[0019] Figure 2 It is a schematic diagram of the combined antenna.

[0020] Figure 3 It is a schematic diagram of the 5G / 4G antenna unit.

[0021] Figure 4 It is a schematic diagram of the WIFI antenna unit.

[0022] Figure 5 It is a return loss parameter diagram of the 5G / 4G antenna unit.

[0023] Figure 6 It is an isolation parameter diagram of the 5G / 4G antenna unit.

[0024] Figure 7 It is a return loss parameter diagram of the WIFI antenna unit.

[0025] Figure 8 It is an isolation parameter diagram of the WIFI antenna unit.

[0026] Figure 9 Radiation efficiency parameter diagram of 5G / 4G antenna unit.

[0027] Figure 10 Radiation efficiency parameter diagram of WIFI antenna unit.

[0028] Wherein, 1-circular reflection floor, 2-5G / 4G antenna unit, 21-first dielectric plate, 22-first radiation patch, 23-first ground patch, 24-second ground patch, 3-WIFI antenna unit, 31-second dielectric plate, 32-second radiation patch, 33-feeding patch, 34-third ground patch, 341-defect slot, 35-third radiation patch, 4-isolation plate. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. In the drawings, preferred embodiments of the application are shown. However, the application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive.

[0030] Referring to the accompanying drawings Figures 1-4 As shown in the drawings, in the present embodiment, a multi-frequency broadband combined antenna applied to a vehicle-mounted environment includes a circular reflection floor 1, four 5G / 4G antenna units 2 and six WIFI antenna units 3. Specifically, the circular reflection floor 1 of the present embodiment is a circular sheet structure with a diameter of 160 mm, a thickness of 0.5 mm and a material of metal copper. The four 5G / 4G antenna units 2 meet the traditional 2G / 3G / LTE / 5G frequency band requirements, and the six WIFI antenna units 3 meet the WiFi, Bluetooth frequency band requirements of 2.4 / 5.8 GHz.

[0031] In the present embodiment, the four 5G / 4G antenna units 2 are arranged around the top surface of the circular reflection floor 1, wherein each 5G / 4G antenna unit 2 is vertically arranged with its upper surface facing outward, and specifically, the 5G / 4G antenna unit 2 is vertically inserted into the top surface of the circular reflection floor 1. By placing four 5G / 4G antenna units 2 around the circular reflection floor 1, a MIMO antenna array is formed.

[0032] Further, referring to the accompanying drawings Figure 3As shown, each 5G / 4G antenna unit 2 of the embodiment comprises a first dielectric plate 21, a first radiation patch 22 arranged on the upper surface of the first dielectric plate 21, and a first ground patch 23 and a second ground patch 24 arranged on the lower surface of the first dielectric plate 21, wherein the first dielectric plate 21 has a thickness of 0.8 mm and a dielectric constant of 4.4. The first radiation patch 22 comprises a first stepped portion and a second stepped portion which are electrically connected to each other, the first ground patch 23 and the second ground patch 24 each comprise a third stepped portion and a fourth stepped portion which are electrically connected to each other, and the third stepped portions of the first ground patch 23 and the second ground patch 24 each extend downward to be electrically connected to the circular reflecting floor 1 for grounding. The second stepped portion and the fourth stepped portion of the embodiment are bent strip lines, and the angle range of the bending is 30°-45°. The above structure is designed to widen the bandwidth, reduce the overall profile height of the antenna, and expand the radiation range of the antenna. The 5G / 4G antenna unit 2 of the embodiment adopts the way of bending the second stepped portion and the fourth stepped portion to achieve a lower profile height, which reduces the profile height of the antenna by about 65% compared with the traditional antenna. Thus, the profile height size of the antenna is reduced, the impedance matching performance is maintained, and the miniaturization performance of the MIMO antenna array is realized.

[0033] Further, the projection areas of the first radiation patch 22, the first ground patch 23, and the second ground patch 24 do not overlap, and the heights of the first ground patch 23, the first radiation patch 22, and the second ground patch 24 are arranged in descending order, so that the layout of the 5G / 4G antenna unit 2 is more compact.

[0034] In the embodiment, six WIFI antenna units 3 are arranged at the middle position of the top surface of the circular reflecting floor 1, wherein each WIFI antenna unit 3 is arranged vertically, the upper surfaces of the WIFI antenna units 3 all face the same direction, and any two WIFI antenna units 3 are not parallel, that is, there is a certain angular displacement between the six WIFI antenna units 3, but the upper surfaces of the WIFI antenna units 3 are all located on the same side. Specifically, each WIFI antenna unit 3 is vertically inserted into the middle position of the top surface of the circular reflecting floor 1, thereby forming a MIMO antenna array.

[0035] Further, referring to the drawings, Figure 4As shown, each WIFI antenna unit 3 comprises a second dielectric plate 31, a second radiation patch 32 and a feed patch 33 arranged on the upper surface of the second dielectric plate 31, and a third radiation patch 35 and a third ground patch 34 arranged on the lower surface of the second dielectric plate 31. The thickness of the second dielectric plate 31 in this embodiment is 1.6 mm, and the dielectric constant is 4.4. The second radiation patch 32 and the feed patch 33 are arranged in a top-bottom manner, and the third radiation patch 35 and the third ground patch 34 are arranged in a top-bottom manner; the two ends of the feed patch 33 pass through the metalized through holes of the second dielectric plate 31 and are electrically connected to the third radiation patch 35 and the third ground patch 34, respectively.

[0036] Specifically, the upper end of the feed patch 33 is electrically connected to the third radiation patch 35 through the metalized through holes of the second dielectric plate 31. The use of the metalized through holes can excite the second radiation patch 32 on the upper surface of the second dielectric plate 31 and the third radiation patch 35 on the lower surface of the second dielectric plate 31, effectively increasing the area of the radiation patch, expanding the bandwidth and improving the gain, thereby meeting the wide bandwidth requirement of 2.4 / 5.8 GHz.

[0037] Specifically, the top of the third ground patch 34 is provided with a defect slot 341 in the shape of an inverted triangle, which can achieve a wider impedance bandwidth and effectively adjust the impedance bandwidth performance of the WIFI antenna unit 3.

[0038] Further, the second radiation patch 32 is in the shape of an inverted triangle, and the third radiation patch 35 is in the shape of a quadrilateral.

[0039] In this embodiment, three isolation plates 4 are arranged at the middle position of the top surface of the circular reflective floor 1, wherein the isolation plates 4 are made of metal copper sheets. Each isolation plate 4 is arranged between two WIFI antenna units 3. For the convenience of explanation, the six WIFI antenna units 3 are numbered as ①, ②, ③, ④, ⑤ and ⑥, respectively, with reference to the accompanying drawings. Figure 2 As shown, the six WIFI antenna units 3 are arranged in a certain layout on the circular reflective floor 1, and are numbered as ①, ②, ③, ④, ⑤ and ⑥, respectively. At this time, one isolation plate 4 is arranged between the two WIFI antenna units 3 numbered as ② and ⑥, one isolation plate 4 is arranged between the two WIFI antenna units 3 numbered as ① and ③, and one isolation plate 4 is arranged between the two WIFI antenna units 3 numbered as ⑥ and ④. The isolation plates 4 are used to improve the isolation of the WIFI antenna units 3.

[0040] For the convenience of understanding the performance of the above-mentioned combined antenna, the following further explanation is made in combination with specific accompanying drawings.

[0041] Referring to the accompanying drawings, Figure 5The return loss parameter of the 5G / 4G antenna unit 2 shown in the figure can be known that the 5G / 4G antenna unit 2 can be less than -6dB in the super wide band frequency of 0.6-6GHz, and can cover the needs of multiple frequency bands of 0.62-0.96GHz, 1.4-1.5GHz, 1.7-2.7GHz, 3.3-3.8GHz, 4.4-5GHz and 5.15-5.85GHz.

[0042] Referring to the accompanying Figure 6 The isolation parameter of the 5G / 4G antenna unit 2 shown in the figure can be known that the isolation is less than -15dB in other frequency bands except for the low frequency band of 0.62-0.96GHz, which is less than 10dB, which can meet the needs of the antenna.

[0043] Referring to the accompanying Figure 7 The return loss parameter of the WIFI antenna unit 3 shown in the figure can be known that the antenna return loss is less than -6dB in the super wide frequency band of 2.2-6GHz, which can completely cover the two WiFi frequency bands of 2.4-2.5GHz and 5.15-5.85GHz.

[0044] Referring to the accompanying Figure 8 The isolation parameter of the WIFI antenna unit 3 shown in the figure can be known that the isolation between most WIFI antenna units 3 is less than -10dB, which can meet the needs of the antenna.

[0045] Referring to the accompanying Figure 9 The radiation efficiency of the four 5G / 4G antenna units 2 shown in the figure can be known that the radiation efficiency of each 5G / 4G antenna unit 2 in the working frequency band is more than 70%; referring to the accompanying Figure 10 The radiation efficiency of the six WIFI antenna units 3 shown in the figure can be known that the radiation efficiency of each WIFI antenna unit 3 in the working frequency band is also more than 65%. Therefore, the combined antenna can meet the needs of the vehicle-mounted antenna environment.

[0046] The above-described embodiments are only the preferred embodiments of the present application, and do not limit the present application in any form. Any skilled person in the art can make more possible changes and decorations to the technical solution of the present application by using the above-mentioned disclosed technical content without departing from the scope of the technical solution of the present application, or modify it. Therefore, any equivalent changes made according to the idea of the present application without departing from the technical solution of the present application shall be covered within the protection scope of the present application.

Claims

1. A multi-bandwidth combined antenna applied to a vehicle-mounted environment, characterized in that: The application relates to a 5G / 4G and WIFI antenna device, which comprises a circular reflecting floor (1), four 5G / 4G antenna units (2) and six WIFI antenna units (3). The four 5G / 4G antenna units (2) are arranged around the top surface of the circular reflecting floor (1), wherein each 5G / 4G antenna unit (2) is vertically arranged with the upper surface facing outward. The six WIFI antenna units (3) are arranged in the middle of the top surface of the circular reflecting floor (1), wherein each WIFI antenna unit (3) is vertically arranged, the upper surfaces of the WIFI antenna units (3) all face the same direction, and any two WIFI antenna units (3) are not parallel. Three isolation plates (4) are arranged in the middle of the top surface of the circular reflecting floor (1), and each isolation plate (4) is arranged between two WIFI antenna units (3). Each 5G / 4G antenna unit (2) comprises a first dielectric plate (21), a first radiation patch (22) arranged on the upper surface of the first dielectric plate (21), a first grounding patch (23) and a second grounding patch (24) arranged on the lower surface of the first dielectric plate (21), wherein the first radiation patch (22) comprises a first stepped portion and a second stepped portion which are electrically connected to each other. The first grounding patch (23) and the second grounding patch (24) each comprise a third stepped portion and a fourth stepped portion which are electrically connected to each other, and the third stepped portions of the first grounding patch (23) and the second grounding patch (24) are electrically connected to the circular reflecting floor (1) to be grounded. The second stepped portion and the fourth stepped portion are bent strip lines. The projection areas of the first radiation patch (22), the first grounding patch (23) and the second grounding patch (24) do not overlap, and the heights of the first grounding patch (23), the first radiation patch (22) and the second grounding patch (24) are arranged in descending order.

2. The multi-bandwidth combined antenna applied to the vehicle-mounted environment according to claim 1, characterized in that: Each WIFI antenna unit (3) comprises a second dielectric plate (31), a second radiation patch (32) and a feed patch (33) arranged on the upper surface of the second dielectric plate (31), and a third radiation patch (35) and a third ground patch (34) arranged on the lower surface of the second dielectric plate (31), wherein the second radiation patch (32) and the feed patch (33) are arranged in an up-down manner, and the third radiation patch (35) and the third ground patch (34) are arranged in an up-down manner; the two ends of the feed patch (33) pass through the second dielectric plate (31) and are electrically connected with the third radiation patch (35) and the third ground patch (34) respectively; the upper end of the feed patch (33) is electrically connected with the third radiation patch (35) through a metalized through hole provided in the second dielectric plate (31), and the upper end of the feed patch (33) is electrically connected with the third radiation patch (35) through a metalized through hole provided in the second dielectric plate (31); the use of the metalized through hole can excite the second radiation patch (32) on the upper surface of the second dielectric plate (31) and the third radiation patch (35) on the lower surface of the second dielectric plate (31), thereby expanding the bandwidth and improving the gain; the top of the third ground patch (34) is provided with a defect slot (341) in the shape of an inverted triangle; the second radiation patch (32) is in the shape of an inverted triangle; and the third radiation patch (35) is in the shape of a quadrilateral.

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