A self-decoupled multi-port antenna

Abstract

The application discloses a self-decoupled multi-port antenna, comprising a substrate and at least one array unit, wherein the substrate is provided with at least one cavity, the array unit comprises a dielectric block, two L-shaped feed structures and a first parasitic patch group, the dielectric block is arranged in the cavity, the L-shaped feed structure is arranged on the dielectric block, and the first parasitic patch group comprises two parasitic patches and is arranged on the surface of the dielectric block. The application can realize self-decoupling among ports, between different ports of the same array unit and between different array units, has the advantages of large impedance bandwidth, strong decoupling bandwidth performance and stable radiation pattern, and is easy to realize a high-frequency and large-scale multi-input multi-output antenna. In addition, due to the simple structure, the application also has the advantages of low profile, easy integration and low cost. The application is widely applied in the technical field of antennas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and particularly to a self-decoupled multi-port antenna. BACKGROUND

[0002] With the rapid development of wireless communication technology, the multi-input multi-output (MIMO) antenna system has become a research hotspot because it can significantly improve the channel capacity and spectrum efficiency. However, the mutual coupling problem between the antenna units in the MIMO antenna system has always been one of the key factors restricting the performance improvement. Mutual coupling not only causes the deterioration of the radiation performance of the antenna system, such as gain reduction and pattern distortion, but also increases the system complexity and insertion loss, thereby affecting the performance of the entire wireless communication system. SUMMARY

[0003] In view of the technical problems such as mutual coupling in the current multi-input multi-output antenna, the purpose of the present application is to provide a self-decoupled multi-port antenna.

[0004] Embodiments of the present application include a self-decoupled multi-port antenna, which comprises a substrate and at least one array unit, the substrate is provided with at least one cavity, and the array unit comprises:

[0005] a dielectric block, which is arranged in the cavity;

[0006] two L-shaped feeding structures, which are arranged on the dielectric block;

[0007] a first parasitic patch group, which comprises two parasitic patches and is arranged on the surface of the dielectric block.

[0008] Further, the array unit further comprises:

[0009] a plurality of metal through holes, which are arranged on the substrate and surround the dielectric block.

[0010] Further, the array unit further comprises:

[0011] at least one second parasitic patch group, which comprises two parasitic patches and is arranged on the surface of the dielectric block;

[0012] wherein the connecting line formed between the two parasitic patches in the first parasitic patch group and the connecting line formed between the two parasitic patches in any one of the second parasitic patch groups are both perpendicular to the connecting line formed between the two L-shaped feeding structures.

[0013] Furthermore, the L-shaped power supply structure includes a power supply patch and a power supply probe. The power supply patch is disposed on the surface of the dielectric block, and one end of the power supply probe is connected to the power supply patch.

[0014] Furthermore, the medium block is provided with a side medium hollowing area and a middle medium hollowing area.

[0015] Furthermore, the self-decoupled multiport antenna includes multiple array elements, and multiple cavities are provided on the substrate, with any array element disposed in a corresponding cavity;

[0016] Each of the array elements is arranged along one direction;

[0017] For any pair of adjacent array cells, at least one of the array cells has a short-circuit patch on the side adjacent to the other array cell.

[0018] Furthermore, each of the array elements is arranged along the H-plane direction;

[0019] For any of the array units, the array unit is provided with short-circuit patches on both sides of the arrangement direction.

[0020] Furthermore, the array elements are arranged at equal intervals, and the distance between any pair of adjacent array elements is determined according to the center frequency wavelength of the self-decoupled multi-port antenna.

[0021] Furthermore, one side of the substrate is provided with an upper metal floor, and the other side is provided with a lower metal floor.

[0022] Furthermore, the portion of the upper metal floor located between any pair of adjacent array units has a gap at its connection with other portions of the upper metal floor.

[0023] The beneficial effects of the present invention are: the self-decoupling multi-port antenna in the embodiments can realize self-decoupling within the port, between different ports of the same array unit, and between different array units. It has the advantages of large impedance bandwidth, strong decoupling bandwidth performance, and stable radiation pattern. It is also easy to realize high-frequency, large-scale multi-input multi-output antennas. Due to its simple structure, it also has the advantages of low profile, easy integration, and low cost. Attached Figure Description

[0024] Figure 1 The image shows an isometric view of a self-decoupled multiport antenna (dual-port decoupled antenna) with one array element in the embodiment.

[0025] Figure 2 This is a top view of a self-decoupled multiport antenna (dual-port decoupled antenna) with one array element in the embodiment;

[0026] Figure 3 for Figure 1 and Figure 2 A schematic diagram of the scattering coefficients of the dual-port decoupled antenna is shown.

[0027] Figure 4 for Figure 1 and Figure 2 The radiation patterns of the dual-port decoupled antenna at various frequencies are shown, where part (a) corresponds to a frequency of 26.5 GHz, part (b) corresponds to a frequency of 28 GHz, and part (c) corresponds to a frequency of 29.5 GHz.

[0028] Figure 5 This is an isometric view of a self-decoupled multiport antenna (six-port decoupled antenna) with three array elements in the embodiment;

[0029] Figure 6 This is a top view of a self-decoupled multiport antenna (six-port decoupled antenna) with three array elements in the embodiment;

[0030] Figure 7 for Figure 5 and Figure 6 The diagram shows the scattering coefficient of a six-port decoupled antenna.

[0031] Figure 8 for Figure 5 and Figure 6 The radiation pattern of the six-port decoupled antenna at the center frequency (28 GHz) is shown, where part (a) corresponds to one of the ports and part (b) corresponds to the other port. Detailed Implementation

[0032] Terminology Explanation:

[0033] Antenna: An antenna is a device used to transmit or receive radio waves. It can convert electrical signals into electromagnetic waves or electromagnetic waves into electrical signals. It is a key component of wireless communication.

[0034] Dielectric resonant antenna: A dielectric resonator antenna is a type of resonant antenna made of low-loss microwave dielectric material. Its resonant frequency is determined by the size, shape, and relative permittivity of the resonator.

[0035] Patch antenna: A patch antenna is a miniaturized microwave antenna, usually printed on a dielectric substrate and working in patch form. It has the characteristics of small size, simple structure and easy integration, and is widely used in communication equipment.

[0036] Multiple-input multiple-output (MIMO) antennas: By configuring multiple antennas at the transmitting and receiving ends, multiple signals can be transmitted and received simultaneously, improving communication capacity and spectrum efficiency;

[0037] Antenna coupling: Antenna coupling refers to the phenomenon where the electromagnetic fields of antennas influence each other, leading to changes in performance and signal interference;

[0038] Antenna isolation: Antenna isolation refers to the degree of isolation between two antennas in signal transmission. It is usually expressed as the ratio of received signal power to interfering signal power, measured in dB. It reflects the degree of coupling between antennas; the higher the isolation, the smaller the coupling between antennas, and the less signal interference.

[0039] To address the mutual coupling problem within antennas, decoupling techniques are required. Feasible decoupling techniques include suppression, cancellation, and self-decoupling. Suppression techniques directly suppress space wave or surface current coupling between antenna elements using defective ground structures (DGS), resonators, or metamaterials. Cancellation techniques, on the other hand, introduce a new coupling path to cancel the original coupling, such as using neutralization lines, decoupling networks, or other parasitic structures. However, both of these methods require the introduction of additional structures (such as DGS, resonators, etc.), which increases system complexity and cost, and may introduce additional losses.

[0040] Based on the above principles, a self-decoupling scheme can be considered. This scheme fully utilizes the radiation characteristics of the original antenna structure to achieve high isolation between antenna elements without introducing additional decoupling components. This technology not only effectively reduces the impact of mutual coupling on antenna system performance but also maintains the simplicity and compactness of the antenna system, which is of great significance for promoting the practical application of MIMO antenna systems.

[0041] Based on the above principles, this embodiment provides a self-decoupling multiport antenna. The self-decoupling multiport antenna includes a substrate and at least one array element. The substrate has at least one cavity, and each cavity houses one array element. Specifically, the substrate can be made of Rogers 6010 material, with one side of the substrate covered with metal (e.g., copper) to form an upper metal ground plane, and the other side of the substrate covered with metal to form a lower metal ground plane. A portion of the material is removed from the substrate (or this portion is not reserved during substrate fabrication) to form a cavity capable of accommodating the array element.

[0042] Example 1: Dual-port decoupling antenna

[0043] In this embodiment, the structure of the self-decoupled multi-port antenna with one cavity and one array element is as follows: Figure 1 and Figure 2 As shown, where Figure 1 It is an isometric view. Figure 2 It is a top view.

[0044] ReferenceFigure 1 and Figure 2 An array unit consisting of a dielectric block, two L-shaped feeding structures, and a first parasitic patch group is disposed in the cavity. The dielectric block is made of dielectric material and can be fixed to the substrate by means of friction, mechanical connection structure, or integral molding.

[0045] In this embodiment, the dielectric block further includes a side-end dielectric hollowing-out region and a middle dielectric hollowing-out region. The side-end dielectric hollowing-out region is the portion of the dielectric block relative to a complete cuboid where the dielectric material is missing from its side. The middle dielectric hollowing-out region is the portion of the dielectric block relative to a complete cuboid where the dielectric material is missing from its interior. Specifically, during the fabrication of the dielectric block, a complete cuboid shape can be first created using dielectric material, and then the dielectric material in the side-end and middle dielectric hollowing-out regions can be removed through processing to obtain the desired dielectric block. Figure 1 and Figure 2 The medium block shown.

[0046] Reference Figure 1 and Figure 2 The dielectric block has an L-shaped power supply structure. Taking one of the L-shaped power supply structures as an example, the L-shaped power supply structure includes a power supply patch and a power supply probe. The power supply patch is placed on the surface of the dielectric block, and one end of the power supply probe is connected to the power supply patch. The power supply probe is led out perpendicular to the surface of the dielectric block. Therefore, the power supply probe and the power supply patch form an L-shaped structure, i.e., the L-shaped power supply structure.

[0047] Reference Figure 2 The medium block is provided with a first parasitic patch group, which includes a parasitic patch labeled A and a parasitic patch labeled A'. Both parasitic patches are disposed on the surface of the medium block.

[0048] In this embodiment, refer to Figure 1 and Figure 2 The substrate material around the cavity outline is provided with multiple arranged metal through holes. These metal through holes are structures that penetrate the substrate and connect the upper metal floor and the lower metal floor with metal. The arrangement of multiple metal through holes surrounds the dielectric block and other structures inside the cavity.

[0049] In this embodiment, Figure 1 and Figure 2 The self-decoupling multiport antenna shown has one array element. Its working principle is as follows: when using Figure 1 and Figure 2 When a self-decoupled multiport antenna with one array element is shown, the two L-shaped feed structures can be used to excite the dielectric block DRA, that is, each L-shaped feed structure is a port of this array element. Figure 1 andFigure 2 The self-decoupling multiport antenna shown is a two-port decoupling antenna; the feed probe in the same L-shaped feed structure can excite the feed patch, thereby exciting the feed patch into a monopole mode. Since the multiport antenna only excites one port at a time, and the other ports are in an unexcited or coupled state, the coupling current on the symmetrical patch (or the probe of the other port) is close to 0, thus achieving a good self-decoupling effect on the same port (e.g., ...). Figure 3 As shown, a transmission zero point can be generated at 27.1 GHz. Figure 3 In this context, S-parameters represent the scattering coefficients, and Frequency represents the frequency, along with a stable radiation pattern [e.g., ...]. Figure 4 [As shown in part (a)]; By introducing the first parasitic patch group, two of the parasitic patches can be excited by the L-shaped feed structure to generate a patch mode loaded by the dielectric block DRA. This mode is superimposed with the cubic mode of the dielectric block DRA, thereby generating a weak field region at the feed probe of the coupled L-shaped feed structure, thus achieving good self-decoupling effect between ports in this frequency band (e.g. Figure 3 As shown, it can generate a second transmission zero at 29.4 GHz. Therefore, the introduction of the first parasitic patch group greatly expands the impedance bandwidth and decoupling bandwidth performance of the self-decoupled multiport antenna.

[0050] However, the introduction of the first parasitic patch group may cause a certain degree of distortion in the mode pattern obtained by superimposing the patch mode with the cubic mode under high-frequency conditions. In this embodiment, at least one second parasitic patch group can be disposed on the surface of the dielectric block to optimize the mode pattern.

[0051] For example, refer to Figure 2 In this embodiment, four groups of second parasitic patches are provided. The first group of second parasitic patches includes parasitic patches labeled a and a'. The second group of second parasitic patches includes parasitic patches labeled b and b'. The third group of second parasitic patches includes parasitic patches labeled c and c'. The fourth group of second parasitic patches includes parasitic patches labeled d and d'.

[0052] In this embodiment, the line connecting two parasitic patches in the first parasitic patch group, and the line connecting two parasitic patches in any second parasitic patch group, are perpendicular to the line connecting the two L-shaped feed structures. The term "line" refers to a mathematical connection formed by treating the parasitic patch as a point; it does not necessarily require the existence of a corresponding physical object. For example, referring to... Figure 2The line connecting the parasitic patch labeled A and the parasitic patch labeled A' in the first parasitic patch group is perpendicular to the line connecting the two L-shaped feed structures; the line connecting the parasitic patch labeled c and the parasitic patch labeled c' in the second parasitic patch group is also perpendicular to the line connecting the two L-shaped feed structures.

[0053] In this embodiment, by setting a second parasitic patch group, a stable radiation pattern under high-frequency conditions can be obtained [e.g., Figure 4 As shown in section (c).

[0054] like Figure 3 As shown, the -10dB impedance bandwidth and 20dB isolation bandwidth (decoupling bandwidth) of the dual-port decoupled antenna reached 14.6% (25.85-29.93GHz) and 14.1% (25.86-29.82GHz), respectively. Furthermore, as... Figure 4 As shown, the dual-port decoupled antenna exhibits a stable radiation pattern within the passband and low cross-polarization control, demonstrating excellent radiation performance.

[0055] Example 2: Six-port decoupling antenna

[0056] In this embodiment, the structure of the self-decoupled multiport antenna with three cavities and three array elements is as follows: Figure 5 and Figure 6 As shown, where Figure 5 It is an isometric view. Figure 6 It is a top view.

[0057] Reference Figure 5 and Figure 6 The three array elements are arranged equidistantly along the H-plane. In this embodiment, the distance between two adjacent array elements is determined based on the vacuum wavelength λ0 of the center frequency of the self-decoupled multi-port antenna. Specifically, the distance between two adjacent array elements can be set to 0.49λ0.

[0058] Since the embodiment of the dual-port decoupled antenna illustrates that an array element can form a dual-port decoupled antenna, and Figure 5 and Figure 6 The self-decoupling multiport antenna in the model has three array elements, therefore Figure 5 and Figure 6 The self-decoupling multiport antenna shown is a six-port decoupling antenna.

[0059] When using multiple array elements to form a six-port decoupled antenna, the dielectric block in each array element may not have a first parasitic patch group and a second parasitic patch group.

[0060] In this embodiment, at least one array unit has a short-circuit patch on the side adjacent to another array unit. For example, the first array unit has a short-circuit patch on the side adjacent to the second array unit, and the second array unit has a short-circuit patch on the side adjacent to the third array unit. Figure 5 and Figure 6 In this array, each array unit has short-circuit patches on both sides of the arrangement direction.

[0061] In this embodiment, Figure 5 and Figure 6 The self-decoupling multiport antenna shown has three array elements. Its working principle is as follows: this six-port self-decoupling antenna is equivalent to a combination of three two-port self-decoupling antennas (the two-port decoupling antennas can be considered as array elements, then the six-port antenna consists of three elements). As seen in the implementation of the two-port self-decoupling antenna, each two ports of each two-port self-decoupling antenna have already completed self-decoupling. Therefore, in the six-port self-decoupling antenna, only the isolation between array elements needs to be considered. Assuming that the three array elements are directly arranged with a spacing of 0.49λ0 without any optimization design, the isolation between the array elements is only about 10dB. However, if... Figure 5 and Figure 6 As shown, by adding symmetrical rectangular short-circuit patches to the surfaces on both sides of the dielectric block in each array cell, the propagation of coupled electromagnetic fields in the dielectric between array cells can be suppressed, thereby achieving an isolation improvement of about 6dB, making the isolation between array cells reach about 17dB. The short-circuit patches do not increase the complexity and cost of the system, nor do they cause distortion, twisting or deflection of the radiation pattern, and the impact on the gain is negligible.

[0062] In this embodiment, refer to Figure 5 Between any pair of adjacent array units, a portion of the substrate material is used to separate the two cavities. This portion of the substrate also has an upper metal ground plane and a lower metal ground plane. (See reference...) Figure 5 For the upper metal floor of this part of the substrate material, the metal material is removed at the connection position between it and other parts of the metal floor (i.e. the main body of the metal floor located on the periphery of the substrate). No metal through holes are provided in this part of the substrate material, so that the upper metal floor and metal through holes are missing in this part, thus forming a gap.

[0063] In this embodiment, gaps are created by slotting the upper metal floor. These gaps can form a leakage wave structure, thereby further improving the isolation between adjacent array elements by 5dB. Ultimately, this ensures that the isolation between all ports of the six-port self-decoupling antenna is greater than 20dB (e.g., Figure 7 As shown), and the radiation patterns of all ports are stable (as shown). Figure 8 (As shown).

[0064] Example 3: 2N-port decoupling antenna

[0065] Examples 1 and 2 achieve decoupling of multi-port antennas without additional decoupling structures and maintain pattern stability. For example, the dual-port decoupled antenna structure in Example 1 is very simple, integrating dielectric blocks, metal cavities, L-shaped feed structures, parasitic patches, etc., on a single-layer substrate, achieving a broadband self-decoupling effect, and the radiation patterns of both ports are very stable, with excellent radiation performance. The six-port decoupled antenna structure in Example 2 is simple, integrating three dual-port decoupled antennas on a single-layer substrate, without adding any additional decoupling structures, achieving an isolation greater than 20dB between all ports, and maintaining stable radiation patterns and excellent radiation performance for all ports.

[0066] Based on the principles of Embodiments 1 and 2, N cavities and N array units can be set on the substrate to form a 2N-port decoupled antenna, thereby expanding the number of ports.

[0067] In this embodiment, after the cavity is prefabricated on the substrate, an elastic dielectric material is used as a dielectric block to manufacture each array unit. The number of array units to be used is determined according to the number of ports required. The array units to be used are placed into the cavity on the substrate. The dielectric block in the array unit is fixed to the substrate by its own elasticity and the friction between it and the inner wall of the cavity. The array units that are not used can be removed from the cavity, thereby realizing the modular maintenance of the self-decoupled multi-port antenna and the arbitrary expansion of ports.

[0068] The 2N-port decoupled antenna in this embodiment features a simple structure, requiring only one substrate layer, with a low profile (only 0.06λ0), making it easier to integrate. It requires no additional decoupling structure, thus not increasing system complexity or cost, introducing no additional losses, and avoiding pattern distortion, warping, or deflection. While typical MIMO antennas are limited to the 3.5GHz band, the 2N-port decoupled antenna in this embodiment can operate at frequencies up to approximately 28GHz. Compared to 3.5GHz low-frequency antennas, millimeter-wave antennas are more challenging to design and manufacture, but they offer advantages such as high bandwidth, low latency, large capacity, and high data rate. Therefore, the millimeter-wave antenna implemented using the 2N-port decoupled antenna in this embodiment is of great significance. Furthermore, the 2N-port decoupled antenna in this embodiment can easily expand the number of ports (N being a positive integer), exhibiting wide applicability and significant implications for large-scale MIMO antenna design.

[0069] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this disclosure are only relative to the relative positional relationships of the components of this disclosure in the accompanying drawings. The singular forms "a" and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. Moreover, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this embodiment specification is only for describing particular embodiments and is not intended to limit the invention. The term "and / or" as used in this embodiment includes any combination of one or more of the associated listed items.

[0070] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may also be referred to as a first element. The use of any and all instances or exemplary language (“e.g.,” “such as,” etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and, unless otherwise required, does not impose a limitation on the scope of the invention.

[0071] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0072] Furthermore, the procedures described in this embodiment can be performed in any suitable order unless otherwise indicated by this embodiment or clearly contradicted by the context. The procedures (or variations and / or combinations thereof) described in this embodiment can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. A computer program includes multiple instructions executable by one or more processors.

[0073] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention of this embodiment includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques of the invention, the invention also includes the computer itself.

[0074] A computer program can be applied to input data to perform the functions of this embodiment, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on the display.

[0075] The above are merely preferred embodiments of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, as long as they achieve the technical effects of the present invention by the same means, should be included within the scope of protection of the present invention. Within the scope of protection of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A self-decoupling multiport antenna, characterized in that, The self-decoupling multiport antenna includes a substrate and at least one array element, wherein the substrate has at least one cavity, and the array element includes: Medium block; the medium block is disposed in the cavity; Two L-shaped power supply structures are provided; the L-shaped power supply structures are disposed on the dielectric block; the L-shaped power supply structure includes a power supply patch and a power supply probe, the power supply patch is disposed on the surface of the dielectric block, and one end of the power supply probe is connected to the power supply patch; First parasitic patch group; the first parasitic patch group includes two parasitic patches, and the first parasitic patch group is disposed on the surface of the medium block; At least one second parasitic patch group; the second parasitic patch group includes two parasitic patches, and the second parasitic patch group is disposed on the surface of the dielectric block; wherein, the connection line formed between the two parasitic patches in the first parasitic patch group, and the connection line formed between the two parasitic patches in any second parasitic patch group, are perpendicular to the connection line formed between the two L-shaped power supply structures.

2. The self-decoupling multiport antenna according to claim 1, characterized in that, The array unit further includes: Multiple metal vias; each of the metal vias is arranged on the substrate and surrounds the dielectric block.

3. The self-decoupling multiport antenna according to claim 1, characterized in that, The medium block has a side medium hollowing area and a middle medium hollowing area.

4. The self-decoupling multiport antenna according to any one of claims 1-3, characterized in that: The self-decoupling multiport antenna includes multiple array elements, and multiple cavities are provided on the substrate, with each array element disposed in a corresponding cavity. Each of the array elements is arranged along one direction; For any pair of adjacent array cells, at least one of the array cells has a short-circuit patch on the side adjacent to the other array cell.

5. The self-decoupling multiport antenna according to claim 4, characterized in that: Each of the array elements is arranged along the H-plane direction; For any of the array units, the array unit is provided with short-circuit patches on both sides of the arrangement direction.

6. The self-decoupling multiport antenna according to claim 5, characterized in that, The array elements are arranged at equal intervals, and the distance between any pair of adjacent array elements is determined according to the center frequency wavelength of the self-decoupled multi-port antenna.

7. The self-decoupling multiport antenna according to claim 4, characterized in that, The substrate has an upper metal floor on one side and a lower metal floor on the other side.

8. The self-decoupling multiport antenna according to claim 7, characterized in that, The portion of the upper metal floor located between any pair of adjacent array units has a gap at its connection with the other portions of the upper metal floor.

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