Antenna decoupling device, antenna array and terminal

Abstract

The present invention provides an antenna decoupling device, an antenna array and a terminal, comprising: a first structure, arranged on a first level, the first structure comprising a plurality of interdigital units; a second structure, arranged on a second level, the second structure comprising a plurality of connection terminals, wherein the plurality of connection terminals correspond to the plurality of interdigital units in the first structure; a short-circuit post, arranged between the first level and the second level, the short-circuit post being used to connect the interdigital units with the corresponding connection terminals; the first level and the second level being used to indicate different levels in the antenna. The interdigital units and the connection terminals are connected via the short-circuit post, the current on the antenna is coupled to the interdigital units, and reaches the connection terminals through the interdigital units via the short-circuit post, when the distance to the middle branch of the connection terminal is half a wavelength, the current at the end thereof is zero, and the current coupled between the two antennas is neutralized, thereby filtering the radio waves between the antennas, thereby reducing the mutual coupling between the radiations of each antenna.

Description

Technical Field

[0001] The present invention relates to the fields of 5G, communications and signal detection, and in particular to an antenna decoupling device, an antenna array and a terminal. Background Art

[0002] With the rapid development and maturity of 4G (fourth generation communication system), the shortage of frequency resources, huge energy consumption and network optimization problems, some emerging mobile communication services have put forward new requirements for the development of mobile communication networks, such as wider frequency band bandwidth, higher data communication service rate, ultra-high connection density and ultra-low latency, which have promoted the research and development of 5G (fifth generation communication system). 5G communication that provides multi-GB data services will bring a new experience to users. In terminals that can support 5G communication systems, the currently popular 4G LTE communication system will be retained. In future terminals, 4G LTE will coexist with 5G. This undoubtedly puts higher requirements on smart terminal devices. In terms of air interface, compatible with 5G communication bands and containing MIMO antenna arrays, through the use of spatial multiplexing and interference reduction, is one of the most important technologies to solve the exponential growth problem of wireless data services. To integrate large-scale MIMO antenna arrays in terminal products, their mutual coupling is serious and the interference is large, which will reduce the efficiency of the entire antenna and even directly affect the performance indicators of the 5G system. Therefore, improving the isolation between antennas is the key to 5G antenna arrays.

[0003] At present, the research on 5G antenna arrays that can be applied to mobile terminals is still focused on the miniaturization, multi-band, and isolation of antennas. It is difficult to place multiple antennas in a small handheld terminal such as a mobile phone, because the size of the mobile phone itself is very small, and the spacing between the antenna units placed in the mobile phone is small. Therefore, there is a strong mutual coupling effect between the antennas and between the antennas and the floor of the mobile phone due to the current flowing between them, which affects the efficiency of the antenna. Therefore, decoupling between antenna units is also one of the research focuses of 5G antenna arrays.

[0004] At present, the methods for improving the isolation between antennas include: neutral line decoupling method, floor slit method, floor branch method, decoupling network method, etc. These methods can only solve limited isolation problems, and the interference between antennas cannot be completely suppressed.

[0005] The MIMO antenna array for current 5G communications requires a greater number of antennas, and it will be difficult to integrate more antennas in a limited size, so higher requirements are placed on antenna isolation.

[0006] With regard to the urgent need to solve the high isolation problem between antenna arrays, the existing solutions are unlikely to effectively solve the problem of increasing the number of antennas in limited space and increasing mutual coupling effects in the 5G communication era. In the transition phase between 4G and 5G, high-frequency and low-frequency antennas coexist, and multiple channel antennas coexist. Not only does the size problem need to be solved, but signal interference will continue to occur between them, and the mutual coupling effect between antennas will become stronger. Multiple antennas will cause continuous signal interference and increased mutual coupling effects, which will seriously affect communication effects and user experience. Summary of the invention

[0007] In order to solve the problem in the prior art that two systems coexist, multiple antennas cause continuous signal interference and enhanced mutual coupling effect, an embodiment of the present invention provides an antenna decoupling device, an antenna array and a terminal. According to an embodiment of the present invention, an antenna decoupling device is provided, which is characterized by comprising:

[0008] A first structure, arranged at a first level, the first structure comprising a plurality of interdigital units;

[0009] A second structure, arranged at a second level, the second structure comprising a plurality of connection ends, wherein the plurality of connection ends correspond to the plurality of interdigital units in the first structure;

[0010] A short-circuit column, disposed between the first layer and the second layer, and used to connect the interdigital unit and the corresponding connection end;

[0011] The first level and the second level are used to indicate different levels in the antenna.

[0012] Optionally, the first structure includes a plurality of interdigital units, including:

[0013] The interdigital structure is a ring-shaped interdigital structure; the ring-shaped interdigital structure is a square-shaped interdigital structure, or a diamond-shaped interdigital structure, or a circular-shaped interdigital structure, or other forms of interdigital structures.

[0014] Optionally, the second structure includes a plurality of connection ends, including:

[0015] The second structure is T-shaped, or two L-shaped structures form a T-shaped structure;

[0016] The two horizontal ends and the two vertical ends of the T-shape or L-shape constitute connecting ends.

[0017] Optionally, the short-circuit post is used to connect the interdigital unit with the corresponding connection end, including:

[0018] The position of the short-circuit post between the first structure and the second structure can be adjusted to select a position with the best decoupling effect.

[0019] According to one embodiment of the present invention, an antenna array is provided, characterized by the antenna and decoupling device described in any one of the above items, wherein the antenna array includes at least two antennas, and the decoupling device is installed between any two of the antennas.

[0020] Optionally, the antenna includes a 4G antenna, a 5G antenna or other antennas;

[0021] Optionally, one decoupling device is installed between any two of the antennas, or a plurality of decoupling devices are installed simultaneously.

[0022] According to an embodiment of the present invention, a terminal is provided, characterized by comprising the device described in any one of the above items, wherein the device is installed in the terminal.

[0023] According to an embodiment of the present invention, an antenna decoupling device, an antenna array and a terminal are provided. The decoupling device is composed of a two-layer structure, including: a ring-shaped interdigital structure on the surface layer and a T-shaped structure on the bottom layer. The two structures are connected by a short-circuit column. The current on the antenna array is coupled to the ring-shaped interdigital structure, and then reaches the T-shaped structure on the bottom layer through the short-circuit column after passing through the ring-shaped interdigital structures on both sides. When the distance to the middle branch of the T-shaped structure is half a wavelength, the current at its end is zero, and the current coupled between the two antennas is neutralized. Therefore, by adjusting the spacing between the interdigital structure and the T-shaped structure, as well as the position of the short-circuit column, the radio waves between the antennas can be filtered, and the radio waves radiated by one antenna can be reduced to be absorbed by other antennas, thereby reducing the mutual coupling between the radiations of each antenna, improving the isolation between the antennas, and can be conveniently applied to mobile terminal devices, alleviating the deficiencies of the prior art. The antenna high isolation decoupling device designed by the present invention has a simple structure, small size, convenient adjustment, alleviates the deficiencies of the prior art, has low cost, strong operability, is easy to implement, has good effect, and is cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 is a three-dimensional schematic diagram of an antenna decoupling structure according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of a first structure of the surface layer of an antenna decoupling structure according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a second structure of the bottom layer of the antenna decoupling structure according to an embodiment of the present invention;

[0028] Figure 4 is a schematic top view of an antenna decoupling structure according to an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of a second double-L-shaped structure according to an embodiment of the present invention;

[0030] Figure 6 is a schematic top view of an antenna array structure according to an embodiment of the present invention;

[0031] Figure 7 is a schematic top view of an antenna according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] An embodiment of the present invention provides an antenna decoupling device. Figure 1 is a three-dimensional schematic diagram of an antenna decoupling structure according to an embodiment of the present invention. Figure 1 As shown, it is characterized by comprising:

[0034] A first structure, arranged on a first layer 6, wherein the first structure comprises a plurality of interdigital units 1, 2;

[0035] A second structure 3, arranged at a second level, the second structure comprising a plurality of connection ends 31, 32, 33, wherein the plurality of connection ends correspond to the plurality of interdigital units in the first structure;

[0036] Short-circuit posts 4 and 5 are arranged between the first layer and the second layer, and the short-circuit posts are used to connect the interdigital units with the corresponding connection ends;

[0037] The first level and the second level are used to indicate different levels in the antenna.

[0038] Optionally, the first structure comprises a plurality of interdigital units 1, 2, Figure 2 is a schematic diagram of a first structure of the surface layer of an antenna decoupling structure according to an embodiment of the present invention, such as Figure 2 As shown, it is characterized by comprising:

[0039] The interdigital units 1 and 2 are annular interdigital structures; the annular interdigital structures are square interdigital structures, or diamond interdigital structures, or circular interdigital structures, or other forms of interdigital structures. The present invention does not limit the shape of the specific interdigital structure, and all interdigital units that can have the above functions are suitable for the embodiments of the present invention.

[0040] Optionally, the second structure 3 includes a plurality of connection ends 31, 32, 33, Figure 3 is a schematic diagram of the second structure of the bottom layer of the antenna decoupling structure according to an embodiment of the present invention, such as Figure 3 As shown, it is characterized by comprising:

[0041] The second structure 3 is T-shaped;

[0042] The two horizontal ends and one vertical end of the T-shape constitute connecting ends 31 , 32 , 33 .

[0043] Figure 3 This is only a schematic diagram of an embodiment of the present invention, and does not limit the shape details of the second structure 3. Any structure that can have the above functions is suitable for the embodiment of the present invention.

[0044] An embodiment of the present invention provides an antenna decoupling device. Figure 4 is a schematic top view of an antenna decoupling structure according to an embodiment of the present invention. Figure 4 As shown, it is characterized by comprising:

[0045] The interdigital units 1 and 2 are respectively connected to different connection ends of the second structure 3. Figure 4 This is only a schematic diagram of an embodiment of the present invention, and does not limit the arrangement positions of the interdigital unit and the second structure.

[0046] Figure 5 is a schematic diagram of a second double L-shaped structure according to an embodiment of the present invention, such as Figure 5 As shown, it is characterized by comprising:

[0047] The second structure 3 is in the shape of two L-shaped structures forming a T-shaped structure;

[0048] The two horizontal ends and the two vertical ends of the double L-shape constitute connecting ends 31 , 32 , 33 .

[0049] Figure 5 This is only a schematic diagram of an embodiment of the present invention, and does not limit the shape details of the second structure 3. Any structure that can have the above functions is suitable for the embodiment of the present invention.

[0050] Optionally, the short-circuit posts 4 and 5 are used to connect the interdigital units 1 and 2 with the corresponding connection terminals 31, 32 and 33, including:

[0051] The positions of the short-circuit posts 4 and 5 between the first structure and the second structure can be adjusted to select the position with the best decoupling effect.

[0052] According to one embodiment of the present invention, an antenna array is provided. Figure 6 is a schematic top view of an antenna array structure according to an embodiment of the present invention. Figure 6 As shown, it is characterized by comprising:

[0053] The antenna and decoupling device described in any of the above items, wherein the antenna array includes at least two antennas, and the decoupling device is installed between any two of the antennas.

[0054] Optionally, the antenna includes a 4G antenna, a 5G antenna or other antennas;

[0055] Optionally, one decoupling device is installed between any two of the antennas, or a plurality of decoupling devices are installed simultaneously.

[0056] like Figure 6 As shown, adding the decoupling structure between the antennas of the terminal product helps to improve the isolation between the antennas. It can be flexibly adjusted according to the layout of the product. Figure 6 The terminal shown in the figure supports 6 antennas, among which the structures of antennas 1 and 2 are shown in the figure, and the forms of the remaining antennas are uncertain and are designed according to the requirements of the terminal. Figure 6 This is only a schematic diagram of an embodiment of the present invention, and does not limit the number, arrangement position and other details of the antenna and the decoupling structure. Antenna arrays with the functions described are all suitable for the embodiment of the present invention.

[0057] According to an embodiment of the present invention, a terminal is provided, characterized in that it includes the device described in any one of the above items, wherein the device is installed in the terminal. The device included in the terminal includes the function described in any one of the above items.

[0058] The present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0059] According to one embodiment of the present invention, the antenna decoupling structure designed by the present invention is simulated and analyzed using electromagnetic simulation software. The size of the dielectric plate in the decoupling device is 40mm*20mm, and a Rogers RT5880 dielectric plate is used, with a dielectric constant of εr=2.2 and a loss tangent tanδ=0.0009. The size of the annular interdigital structures 1 and 2 is determined by a quarter wavelength of the antenna operating frequency. If it works at 3.3GHz-5GHz, and its center frequency is 4.15GHz, then the electrical length of the antenna is 12.2mm, so the four sides of the annular interdigital structures 1 and 2 are about 3mm respectively. The length of the short-circuit posts 4 and 5 and the distance to the T-shaped structure are determined by half the wavelength of the antenna operating frequency. By adjusting the position of the short-circuit posts 4 and 5 and the distance to the end of the T-shaped structure, the isolation between the antennas can be optimized.

[0060] The decoupling structure of the surface layer and the bottom layer of the dielectric plate can be in the form of PCB copper cladding, and the dielectric plate can be Rogers RT5880, polytetrafluoroethylene FR4, etc. All materials with the functions are suitable for the embodiments of the present invention, and the present invention does not impose any restrictions on the manufacturing process, material, etc. of the device and the structure.

[0061] According to one embodiment of the present invention, an antenna array is provided. Figure 7 is a schematic top view of an antenna according to an embodiment of the present invention, such as Figure 7 As shown, it is characterized by comprising:

[0062] Hint Figure 7 The antenna in the embodiment is composed of an inverted L branch 7 and an F-type branch 9. Antenna 1 works at 3.3GHz-4.2GHz, 4.4GHz-5GHz, and 2.5-2.7GHz, wherein the inverted L branch 7 works at 2.5-2.7GHz, and the F-type branch 9 works at two frequency bands of 3.3GHz-4.2GHz and 4.4GHz-5GHz. The length of the antenna is adjusted according to the working frequency, and its size is determined by one-quarter wavelength of the working frequency. The short-circuit post at the end of the inverted L antenna 7 is connected to the bottom ground, thereby increasing the working bandwidth of the antenna. The new decoupling structure is loaded between the two antennas to filter the radio waves between the antennas, reduce the radio waves radiated by antenna 1 from being absorbed by antenna 2, thereby reducing the mutual coupling between the radiations of the two antennas and improving the isolation between the antennas. Figure 7 It is only a schematic diagram of an embodiment of the present invention, and does not limit the shape of the antenna, nor the number, arrangement position and other details of the antenna and the decoupling structure. Antennas and antenna arrays with the functions are all suitable for the embodiment of the present invention.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An antenna decoupling device, characterized in that: include: A first structure is arranged at a first level, wherein the first structure comprises a plurality of interdigital units, wherein the interdigital units are ring-shaped interdigital structures; the ring-shaped interdigital structures are square ring-shaped interdigital structures, or diamond ring-shaped interdigital structures, or circular ring-shaped interdigital structures, or other forms of ring-shaped interdigital structures; A second structure, arranged at a second level, the second structure comprising a plurality of connection ends, wherein the plurality of connection ends correspond to the plurality of interdigital units in the first structure; A short-circuit column, disposed between the first layer and the second layer, and used to connect the interdigital unit and the corresponding connection end; The first level and the second level are used to indicate different levels in the antenna.

2. The structure according to claim 1, characterized in that: The second structure includes a plurality of connection terminals, including: The second structure is T-shaped, or two L-shaped structures form a T-shaped structure; The two horizontal ends and the two vertical ends of the T-shape or L-shape constitute connecting ends.

3. The structure according to claim 1, characterized in that: The short-circuit post is used to connect the interdigital unit and the corresponding connection end, and includes: The position of the short-circuit post between the first structure and the second structure can be adjusted to select a position with the best decoupling effect.

4. An antenna array, characterized in that: The antenna decoupling device as claimed in any one of claims 1 to 3 is used, wherein the antenna array includes at least two antennas, and the decoupling device is installed between any two of the antennas.

5. The antenna array according to claim 4, characterized in that: The antenna includes a 4G antenna, a 5G antenna or other antennas.

6. The antenna array according to claim 4, characterized in that: One decoupling device is installed between any two of the antennas, or a plurality of decoupling devices are installed simultaneously.

7. A terminal, characterized in that: The invention comprises the device as claimed in claim 1, wherein the device is installed in the terminal.

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