MIMO antenna and communication device

Abstract

The embodiment of the utility model relates to the technical field of wireless communication, and discloses an MIMO antenna and a communication device, the MIMO antenna comprises a substrate, a connecting plate assembly and a radiant panel, the connecting plate assembly comprises a first connecting plate and a second connecting plate, one end of the first connecting plate and one end of the second connecting plate are both electrically connected with the substrate, and the radiant panel is electrically connected with the substrate. The radiation plate is provided with a first radiation part, a second radiation part and a neutralization part, the first radiation part and the second radiation part are arranged at an interval, the first radiation part is electrically connected with the other end of the first connecting plate, so that the substrate, the first connecting plate and the radiation plate form a first antenna, and the second radiation part is electrically connected with the other end of the second connecting plate; the working frequency band of the second antenna is the same as that of the first antenna, and the two ends of the neutralization part are electrically connected with the first radiation part and the second radiation part respectively. According to the embodiment of the utility model, the isolation performance of the first antenna and the second antenna can be improved.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to a MIMO antenna and communication device. Background Technology

[0002] Small base stations are compact, low-power, and easy-to-deploy wireless transceivers. They are deployed in high-traffic areas such as hospitals, shopping malls, pedestrian streets, and large stadiums to eliminate signal blind spots. Small base stations transmit and receive signals using MIMO (Multiple-Input Multiple-Output) antennas.

[0003] During the implementation of this utility model embodiment, the inventors discovered that: currently, MIMO antennas typically include two antennas operating in the same frequency band. However, the miniaturization of MIMO antennas has resulted in a closer distance between the two antennas operating in the same frequency band, leading to strong coupling between the two antennas and resulting in low isolation performance between the two antennas. Utility Model Content

[0004] The main technical problem solved by this utility model embodiment is to provide a MIMO antenna and communication device to solve the problem of low isolation performance between two antennas.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this utility model embodiment is: providing a MIMO antenna, including a substrate, a connecting plate assembly, and a radiating plate. The connecting plate assembly includes a first connecting plate and a second connecting plate. One end of the first connecting plate and one end of the second connecting plate are electrically connected to the substrate. The radiating plate is provided with a first radiating part, a second radiating part, and a neutralizing part. The first radiating part and the second radiating part are spaced apart. The first radiating part is electrically connected to the other end of the first connecting plate, so that the substrate, the first connecting plate, and the radiating plate form a first antenna. The second radiating part is electrically connected to the other end of the second connecting plate, so that the substrate, the second connecting plate, and the first radiating part form a second antenna. The second antenna operates in the same frequency band as the first antenna. The two ends of the neutralizing part are electrically connected to the first radiating part and the second radiating part, respectively.

[0006] Optionally, the distance from one end of the neutralizing portion to the other end is between one-quarter and one-half wavelength of the center frequency of the first antenna or the second antenna.

[0007] Optionally, the substrate is provided with a first through hole, the radiating plate is provided with a second through hole and a third through hole, and the first connecting plate is provided with a first fixing part, a second fixing part and a third fixing part;

[0008] The first fixing part is fixedly inserted into the first through hole;

[0009] The second fixing part passes through and is fixed to the second through hole, and the third fixing part passes through and is fixed to the third through hole. Both the second fixing part and the third fixing part are electrically connected to the first radiating part.

[0010] Optionally, the first connecting plate is provided with a first power supply section and a first ground supply section, both of which are electrically connected to the substrate.

[0011] Optionally, the substrate is provided with a fourth through hole, the radiating plate is provided with a fifth through hole and a sixth through hole, and the second connecting plate is provided with a fourth fixing part, a fifth fixing part and a sixth fixing part;

[0012] The fourth fixing part is fixedly inserted into the fourth through hole;

[0013] The fifth fixing part passes through and is fixed to the fifth through hole, and the sixth fixing part passes through and is fixed to the sixth through hole. Both the fifth fixing part and the sixth fixing part are electrically connected to the second radiating part.

[0014] Optionally, the second connecting plate is provided with a second power supply section and a second ground supply section, both of which are electrically connected to the substrate.

[0015] Optionally, the distance between the first radiating part and the second radiating part is one-sixteenth of the wavelength of the center frequency of the first antenna or the second antenna.

[0016] Optionally, the MIMO antenna includes a bracket located between the substrate and the radiating plate, and the bracket is fixed to the substrate and the radiating plate.

[0017] Optionally, the bracket is provided with a first fixing column and a second fixing column;

[0018] The substrate is provided with a first fixing hole, and the first fixing post passes through the first fixing hole and is fixed to the substrate.

[0019] The radiant plate is provided with a second fixing hole, and the second fixing post passes through the second fixing hole and is fixed to the radiant plate.

[0020] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is to provide a communication device including the above-mentioned MIMO antenna.

[0021] In this embodiment of the invention, the MIMO antenna includes a substrate, a connecting plate assembly, and a radiating plate. The connecting plate assembly includes a first connecting plate and a second connecting plate. One end of the first connecting plate and one end of the second connecting plate are electrically connected to the substrate. The radiating plate is provided with a first radiating portion, a second radiating portion, and a neutralizing portion. The first radiating portion and the second radiating portion are spaced apart. The first radiating portion is electrically connected to the other end of the first connecting plate, so that the substrate, the first connecting plate, and the radiating plate form a first antenna. The second radiating portion is electrically connected to the other end of the second connecting plate, so that the substrate, the second connecting plate, and the first radiating portion form a second antenna. The second antenna operates in the same frequency band as the first antenna. The two ends of the neutralizing portion are electrically connected to the first radiating portion and the second radiating portion, respectively. The neutralizing portion improves the isolation performance of the first antenna and the second antenna. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this utility model or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0023] Figure 1 This is a schematic diagram of the structure of the MIMO antenna provided in this embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the substrate of the MIMO antenna provided in this embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the connection board assembly of the MIMO antenna provided in this embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the radiating plate of the MIMO antenna provided in this embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the MIMO antenna support provided in this embodiment of the utility model;

[0028] Figure 6 This is a measured standing wave diagram of the MIMO antenna with an operating frequency band of 2.6 GHz provided in this embodiment of the utility model;

[0029] Figure 7 This is a measured isolation diagram of the MIMO antenna provided in this embodiment of the invention, operating at a frequency of 2.6 GHz.

[0030] Figure 8This is a schematic diagram of the non-circularity of the MIMO antenna provided in this embodiment of the invention, with the operating frequency band of 2.6G, in the horizontal direction (Theta = 80°) obtained in a SATIMO anechoic chamber.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. MIMO antenna;

[0033] 1. Substrate; 11. First through hole; 12. Fourth through hole; 13. First fixing hole; 14. Mounting hole;

[0034] 2. Connecting plate assembly; 21. First connecting plate; 211. First fixing part; 212. Second fixing part; 213. Third fixing part; 214. First power supply part; 215. First ground supply part; 22. Second connecting plate; 221. Fourth fixing part; 222. Fifth fixing part; 223. Sixth fixing part; 224. Second power supply part; 225. Second ground supply part;

[0035] 3. Radiation plate; 31. First radiating section; 32. Second radiating section; 33. Neutralizing section; 34. Second through hole; 35. Third through hole; 36. Fifth through hole; 37. Sixth through hole; 38. Second fixing hole;

[0036] 4. Bracket; 41. First fixing post; 42. Second fixing post. Detailed Implementation

[0037] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Please see Figure 1 This application provides a MIMO antenna 100, which includes a substrate 1, a connecting plate assembly 2, a radiating plate 3, and a support 4. The substrate 1 and the radiating plate 3 are opposite to each other, and the connecting plate assembly 2 is electrically connected to both the substrate 1 and the radiating plate 3, so that the substrate 1, the connecting plate assembly 2, and the radiating plate 3 form a first antenna and a second antenna, and the first antenna and the second antenna operate in the same frequency band. The support 4 is disposed between the substrate 1 and the radiating plate 3, and the support 4 is fixed to both the substrate 1 and the radiating plate 3.

[0041] In some embodiments, the first and second antennas operate at a frequency of 2.6 GHz (2496-2690 MHz). Furthermore, in some embodiments, the first and second antennas operate at frequencies of 1.8 GHz, 2.1 GHz, or 2.3 GHz.

[0042] For substrate 1 mentioned above, please refer to Figure 2 The substrate 1 is provided with a first through hole 11, a fourth through hole 12, a first fixing hole 13, and a mounting hole 14. The first through hole 11 and the fourth through hole 12 are both for inserting and fixing the connecting plate assembly 2, so that the substrate 1 is connected and fixed to the connecting plate assembly 2. The first fixing hole 13 is a through hole through which a portion of the bracket 4 passes. The mounting hole 14 is a through hole for through which a connector passes, so that the substrate 1 is connected and fixed to the outside.

[0043] In some embodiments, substrate 1 is a circuit board made of double-sided copper-clad FR4 board material, substrate 1 has a dielectric constant of 4.4 and a thickness of 1.5 mm.

[0044] For the aforementioned connecting plate assembly 2, please refer to Figure 3The connecting plate assembly 2 includes a first connecting plate 21 and a second connecting plate 22. The first connecting plate 21 is located between the substrate 1 and the radiating plate 3. One end of the first connecting plate 21 is fixedly inserted into a first through hole 11, and one end of the first connecting plate 21 is electrically connected to the substrate 1. The other end of the first connecting plate 21 is electrically connected to the radiating plate 3, so that the substrate 1, the first connecting plate 21, and the radiating plate 3 form a first antenna. The first connecting plate 21 is used to increase the bandwidth of the first antenna. The second connecting plate 22 is located between the substrate 1 and the radiating plate 3. One end of the second connecting plate 22 is fixedly inserted into a fourth through hole 12, and one end of the second connecting plate 22 is electrically connected to the substrate 1. The other end of the second connecting plate 22 is electrically connected to the radiating plate 3, so that the substrate 1, the second connecting plate 22, and the radiating plate 3 form a second antenna. The second connecting plate 22 is used to increase the bandwidth of the second antenna.

[0045] The first connecting plate 21 is provided with a first fixing part 211, a second fixing part 212, a third fixing part 213, a first power supply part 214, and a first ground supply part 215. The first fixing part 211 is located at one end of the first connecting plate 21 and is fixedly inserted into the first through hole 11 to connect and fix the first connecting plate 21 to the substrate 1. The second fixing part 212 is located at the other end of the first connecting plate 21 and is electrically connected to the radiating plate 3. The third fixing part 213 is located at the other end of the first connecting plate 21 and is electrically connected to the radiating plate 3. The first power supply part 214 is located at one end of the first connecting plate 21 and is electrically connected to the substrate 1. The first ground supply part 215 is electrically connected to the substrate 1. With the above structure, the signal of the first antenna is fed from the substrate 1 to the first connecting plate 21 through the first feed part 214, and then flows back to the substrate 1 through the second fixing part 212, the radiating plate 3, the third fixing part 213 and the first ground feed part 215 in sequence, so as to form the loop circuit of the first antenna.

[0046] In some embodiments, the first connecting plate 21 is a circuit board made of double-sided copper-clad FR4 board material, the dielectric constant of the first connecting plate 21 is 4.4, and the thickness of the first connecting plate 21 is 1 mm.

[0047] In some embodiments, the number of the first fixing part 211 and the first through hole 11 is two, but the number of the first fixing part 211 and the first through hole 11 can be two, three, four, etc.

[0048] The second connecting plate 22 is provided with a fourth fixing part 221, a fifth fixing part 222, a sixth fixing part 223, a second power supply part 224, and a second grounding part 225. The fourth fixing part 221 is located at one end of the second connecting plate 22 and is fixedly inserted into the fourth through hole 12 to connect and fix the second connecting plate 22 to the substrate 1. The fifth fixing part 222 is located at the other end of the second connecting plate 22 and is electrically connected to the radiating plate 3. The sixth fixing part 223 is located at the other end of the second connecting plate 22 and is electrically connected to the radiating plate 3. The second power supply part 224 is located at one end of the second connecting plate 22 and is electrically connected to the substrate 1. The second grounding part 225 is electrically connected to the substrate 1. With the above structure, the signal of the second antenna is fed from the substrate 1 to the second connecting plate 22 through the second power supply section 224, and then flows back to the substrate 1 through the fifth fixing section 222, the radiating plate 3, the sixth fixing section 223, and the second grounding section 225 to form the loop circuit of the second antenna.

[0049] In some embodiments, the second connecting plate 22 is a circuit board made of double-sided copper-clad FR4 board material, the dielectric constant of the second connecting plate 22 is 4.4, and the thickness of the second connecting plate 22 is 1 mm.

[0050] In some embodiments, the number of the fourth fixing part 221 and the fourth through hole 12 is two, but the number of the fourth fixing part 221 and the fourth through hole 12 can be two, three, four, etc.

[0051] For the aforementioned radiating plate 3, please refer to Figure 4The radiating plate 3 is provided with a first radiating part 31, a second radiating part 32, a neutralizing part 33, a second through hole 34, a third through hole 35, a fifth through hole 36, a sixth through hole 37, and a second fixing hole 38. The first radiating part 31 is disposed on the edge of the surface of the radiating plate 3 facing away from the substrate 1, and is electrically connected to the second fixing part 212 and the third fixing part 213. The second radiating part 32 is disposed on the edge of the surface of the radiating plate 3 facing away from the substrate 1, and is spaced apart from the first radiating part 31. The second radiating part 32 is electrically connected to the fifth fixing part 222 and the sixth fixing part 223. The neutralizing part 33 is disposed on the edge of the surface of the radiating plate 3 facing away from the substrate 1, with one end electrically connected to the first radiating part 31 and the other end electrically connected to the second radiating part 32. The neutralizing part 33 is used to improve the isolation performance of the first antenna and the second antenna. The neutralizing part 33 reduces the distance between the first antenna and the second antenna, thereby achieving the miniaturization and low cost requirements of the MIMO antenna 100. The second through hole 34 allows the second fixing part 212 to pass through and be fixed, thus connecting and fixing the radiating plate 3 to the first connecting plate 21. The third through hole 35 allows the third fixing part 213 to pass through and be fixed, making the connection and fixation between the radiating plate 3 and the first connecting plate 21 more secure. The fifth through hole 36 allows the fifth fixing part 222 to pass through and be fixed, thus connecting and fixing the radiating plate 3 to the second connecting plate 22. The sixth through hole 37 allows the sixth fixing part 223 to pass through and be fixed, making the connection and fixation between the radiating plate 3 and the second connecting plate 22 more secure. The second fixing hole 38 is a through hole through which part of the bracket 4 passes.

[0052] In some embodiments, the distance between the second radiating part 32 and the first radiating part 31 is one-sixteenth of the wavelength of the center frequency of the first antenna or the second antenna.

[0053] In some embodiments, the distance between one end of the neutralizing portion 33 and the other end is between one-quarter and one-half wavelength of the center frequency of the first antenna or the second antenna.

[0054] In some embodiments, the radiating plate 3 is a circuit board made of FR4 board material with single-sided copper cladding. Single-sided copper cladding means that the surface of the radiating plate 3 facing away from the substrate 1 is copper clad. The dielectric constant of the radiating plate 3 is 4.4, and the thickness of the radiating plate 3 is 1 mm.

[0055] For the bracket 4 mentioned above, please refer to Figure 5 The bracket 4 is provided with a first fixing post 41 and a second fixing post 42. The first fixing post 41 passes through the first fixing hole 13 and is fixed to the substrate 1, thereby fixing the bracket 4 to the substrate 1. The second fixing post 42 passes through the second fixing hole 38 and is fixed to the radiating plate 3, thereby fixing the bracket 4 to the radiating plate 3.

[0056] To verify the concept of the MIMO antenna 100 in this embodiment of the present invention, the following simulation experiment was conducted:

[0057] The MIMO antenna 100 was simulated using a network analyzer, and the simulation results are as follows: Figure 6 and Figure 7 As shown, Figure 6 The simulation diagram shows the 100 VSWR of a MIMO antenna operating at a frequency of 2.6 GHz. The measured VSWR is 1.70. Figure 7 The simulation diagram shows the isolation of the MIMO antenna 100 operating at a frequency of 2.6 GHz. The measured isolation is 22.6 dB, achieving high isolation for the MIMO antenna 100.

[0058] The radiation pattern of a 2.6G MIMO antenna 100 was simulated using an SG24 anechoic chamber. The simulation results are as follows: Figure 8 As shown, Figure 8 This is a schematic diagram of the non-circularity of a MIMO antenna 100 operating at 2.6 GHz in the horizontal direction (Theta = 80°) obtained in a SATIMO anechoic chamber. Figure 8 As shown, when the MIMO antenna 100 operates in the 2.6G frequency band, the non-circularity of the MIMO antenna 100 in the horizontal direction is less than 8dB, which can meet the communication requirements of the communication device and also achieve the high circularity performance of the MIMO antenna 100.

[0059] In this embodiment of the invention, the MIMO antenna 100 includes a substrate 1, a connecting plate assembly 2, and a radiating plate 3. The connecting plate assembly 2 includes a first connecting plate 21 and a second connecting plate 22. One end of the first connecting plate 21 and one end of the second connecting plate 22 are electrically connected to the substrate 1. The radiating plate 3 is provided with a first radiating portion 31, a second radiating portion 32, and a neutralizing portion 33. The first radiating portion 31 and the second radiating portion 32 are spaced apart. The first radiating portion 31 is electrically connected to the other end of the first connecting plate 21, so that the substrate 1, the first connecting plate 21, and the radiating plate 3 form a first antenna. The second radiating portion 32 is electrically connected to the other end of the second connecting plate 22, so that the substrate 1, the second connecting plate 22, and the first radiating portion 31 form a second antenna. The second antenna operates at the same frequency band as the first antenna. The two ends of the neutralizing portion 33 are electrically connected to the first radiating portion 31 and the second radiating portion 32, respectively. The neutralizing portion 33 improves the isolation performance of the first antenna and the second antenna.

[0060] This utility model also provides a communication device embodiment, which includes the MIMO antenna 100 described above. For the specific structure and function of the MIMO antenna 100, please refer to the above embodiment, which will not be repeated here.

[0061] In some embodiments, the communication device is a small base station.

[0062] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A MIMO antenna, characterized in that, include: substrate; The connecting plate assembly includes a first connecting plate and a second connecting plate, wherein one end of the first connecting plate and one end of the second connecting plate are electrically connected to the substrate. A radiating plate is provided with a first radiating part, a second radiating part, and a neutralizing part. The first radiating part and the second radiating part are spaced apart. The first radiating part is electrically connected to the other end of the first connecting plate so that the substrate, the first connecting plate, and the radiating plate form a first antenna. The second radiating part is electrically connected to the other end of the second connecting plate so that the substrate, the second connecting plate, and the first radiating part form a second antenna. The second antenna operates in the same frequency band as the first antenna. The two ends of the neutralizing part are electrically connected to the first radiating part and the second radiating part, respectively.

2. The MIMO antenna according to claim 1, characterized in that, The distance from one end of the neutralizing section to the other end is between one-quarter and one-half wavelength of the center frequency of the first antenna or the second antenna.

3. The MIMO antenna according to claim 1, characterized in that, The substrate is provided with a first through hole, the radiating plate is provided with a second through hole and a third through hole, and the first connecting plate is provided with a first fixing part, a second fixing part and a third fixing part; The first fixing part is fixedly inserted into the first through hole; The second fixing part passes through and is fixed to the second through hole, and the third fixing part passes through and is fixed to the third through hole. Both the second fixing part and the third fixing part are electrically connected to the first radiating part.

4. The MIMO antenna according to claim 3, characterized in that, The first connecting plate is provided with a first power supply section and a first ground supply section, both of which are electrically connected to the substrate.

5. The MIMO antenna according to claim 1, characterized in that, The substrate is provided with a fourth through hole, the radiating plate is provided with a fifth through hole and a sixth through hole, and the second connecting plate is provided with a fourth fixing part, a fifth fixing part and a sixth fixing part; The fourth fixing part is fixedly inserted into the fourth through hole; The fifth fixing part passes through and is fixed to the fifth through hole, and the sixth fixing part passes through and is fixed to the sixth through hole. Both the fifth fixing part and the sixth fixing part are electrically connected to the second radiating part.

6. The MIMO antenna according to claim 5, characterized in that, The second connecting plate is provided with a second power supply section and a second ground supply section, both of which are electrically connected to the substrate.

7. The MIMO antenna according to claim 1, characterized in that, The distance between the first radiating part and the second radiating part is one-sixteenth of the wavelength of the center frequency of the first antenna or the second antenna.

8. The MIMO antenna according to any one of claims 1-7, characterized in that, The MIMO antenna includes a bracket located between the substrate and the radiating plate, and the bracket is fixed to the substrate and the radiating plate.

9. The MIMO antenna according to claim 8, characterized in that, The bracket is provided with a first fixing column and a second fixing column; The substrate is provided with a first fixing hole, and the first fixing post passes through the first fixing hole and is fixed to the substrate. The radiating plate is provided with a second fixing hole, and the second fixing post passes through the second fixing hole and is fixed to the radiating plate.

10. A communication device, characterized in that, Includes the MIMO antenna as described in any one of claims 1-9.

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