Self-decoupling multi-port antenna

Abstract

A self-decoupling multi-port antenna disclosed by the present invention comprises a substrate and at least one array unit, 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 structures are arranged on the dielectric block, and the first parasitic patch group is arranged in the cavity. The first parasitic patch group comprises two parasitic patches, and the first parasitic patch group is arranged on the surface of the dielectric block. Self-decoupling in ports, among different ports of the same array unit and among different array units can be achieved, the antenna has the advantages of being large in impedance bandwidth, high in decoupling bandwidth performance and stable in radiation pattern, a high-frequency and large-scale multiple-input-multiple-output antenna is easy to achieve, and due to the fact that the structure is simple, cost is low, and the antenna is easy to popularize. And the antenna has the advantages of low profile, easy integration, low cost and the like. The antenna is widely applied to the technical field of antennas.

Description

Technical Field

[0001] The invention relates to the technical field of antennas, and in particular to a self-decoupling multi-port antenna. Background Art

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

[0003] In view of the technical problems such as mutual coupling existing in current multiple-input multiple-output antennas, an object of the present invention is to provide a self-decoupling multi-port antenna.

[0004] An embodiment of the present invention includes a self-decoupling multi-port antenna, the self-decoupling multi-port antenna includes a substrate and at least one array unit, the substrate is provided with at least one cavity, the array unit includes:

[0005] A dielectric block; the dielectric block is arranged in the cavity;

[0006] Two L-shaped feeding structures; the L-shaped feeding structures are arranged on the dielectric block;

[0007] A first parasitic patch group; the first parasitic patch group includes two parasitic patches, and the first parasitic patch group is arranged on the surface of the dielectric block.

[0008] Furthermore, the array unit further includes:

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

[0010] Furthermore, the array unit further includes:

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

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

[0013] Furthermore, the L-shaped feeding structure comprises a feeding patch and a feeding probe, the feeding patch is arranged on the surface of the dielectric block, and one end of the feeding probe is connected to the feeding patch.

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

[0015] Furthermore, the self-decoupling multi-port antenna comprises a plurality of the array units, a plurality of the cavities are provided on the substrate, and any of the array units is arranged in a corresponding one of the cavities;

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

[0017] For any pair of adjacent array units, at least one of the array units is provided with a short-circuit patch on a side adjacent to the other array unit.

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

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

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

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

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

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

[0024] Figure 1 An isometric view of a self-decoupled multi-port antenna (dual-port decoupled antenna) having one array unit in an embodiment;

[0025] Figure 2 A top view of a self-decoupled multi-port antenna (dual-port decoupling antenna) having one array unit in an embodiment;

[0026] Figure 3 for Figure 1 and Figure 2 Schematic diagram of the scattering coefficient of the dual-port decoupling antenna shown;

[0027] Figure 4 for Figure 1 and Figure 2 The radiation patterns of the dual-port decoupling 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 An isometric view of a self-decoupled multi-port antenna (six-port decoupled antenna) with three array elements in an embodiment;

[0029] Figure 6 A top view of a self-decoupled multi-port antenna (six-port decoupling antenna) with three array units in an embodiment;

[0030] Figure 7 for Figure 5 and Figure 6 Schematic diagram of the scattering coefficient of the six-port decoupling antenna shown;

[0031] Figure 8 for Figure 5 and Figure 6 The radiation pattern of the six-port decoupling 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 DESCRIPTION

[0032] Terminology explanation:

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

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

[0035] Patch antenna: Patch antenna is a miniaturized microwave antenna, usually printed on a dielectric substrate, working in the form of a patch. 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) antenna: 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 that the electromagnetic fields between antennas affect each other, causing performance changes and signal interference;

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

[0039] In order to solve the mutual coupling problem inside the antenna, antenna decoupling technology is needed. The feasible decoupling technologies include suppression scheme, offset scheme and self-decoupling scheme. The suppression scheme directly suppresses the spatial wave or surface current coupling between antenna units by adopting technologies such as defective ground structure (DGS), resonator or metamaterial. The offset scheme offsets the original coupling by introducing a new coupling path, such as using a neutralization line, decoupling network, or other parasitic structures. However, both methods require the introduction of additional structures (such as DGS, resonator, etc.), which increases the complexity and cost of the system and may introduce additional losses.

[0040] Based on the above principles, a self-decoupling solution can be considered. The self-decoupling solution makes full use of the radiation characteristics of the original antenna structure to achieve high isolation between antenna units without introducing additional decoupling components. This technology can not only effectively reduce the impact of mutual coupling on the performance of the antenna system, but also maintain 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, a self-decoupled multi-port antenna is provided in this embodiment. The self-decoupled multi-port antenna includes a substrate and at least one array unit, and at least one cavity is provided on the substrate, and an array unit is installed in each cavity. Specifically, the substrate can be made of Rogers 6010 material, and metal (such as copper) is covered on one side of the substrate to form an upper metal floor, and metal is covered on the other side of the substrate to form a bottom metal floor, and a part of the material is removed from the inside of the substrate (or this part of the material is not reserved when the substrate is manufactured) to form a cavity that can accommodate the array unit.

[0042] Embodiment 1: Dual-port decoupling antenna

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

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

[0045] In this embodiment, the dielectric block is further provided with a side dielectric hollowing region and a middle dielectric hollowing region, wherein the side dielectric hollowing region is the part of the dielectric block that is missing dielectric material at its side relative to a complete rectangular parallelepiped, and the middle dielectric hollowing region is the part of the dielectric block that is missing dielectric material inside relative to a complete rectangular parallelepiped. Specifically, when manufacturing the dielectric block, a complete rectangular parallelepiped shape can be firstly manufactured with dielectric material, and then the dielectric material in the side dielectric hollowing region and the middle dielectric hollowing region can be removed by processing, so as to obtain Figure 1 and Figure 2 The dielectric block shown.

[0046] Reference Figure 1 and Figure 2 , an L-shaped feeding structure is provided on the dielectric block. Taking one of the L-shaped feeding structures as an example, the L-shaped feeding structure includes a feeding patch and a feeding probe, wherein the feeding patch is provided on the surface of the dielectric block, one end of the feeding probe is connected to the feeding patch, and the feeding probe is led out perpendicular to the surface of the dielectric block, so that the feeding probe and the feeding patch form an L-shaped structure, namely the L-shaped feeding structure.

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

[0048] In this embodiment, refer to Figure 1 and Figure 2 The substrate material around the outline of the cavity is provided with a plurality of arranged metal through holes, and these metal through holes are structures that penetrate the substrate and connect the upper metal floor and the bottom metal floor with metal. The plurality of metal through holes are arranged to surround the dielectric block and other structures in the cavity.

[0049] In this embodiment, Figure 1 and Figure 2 The self-decoupling multi-port antenna with an array unit shown in the figure works on the basis of: Figure 1 and Figure 2 When a self-decoupled multi-port antenna with an array unit is provided as shown, two L-shaped feeding structures can be used to excite the dielectric block DRA respectively, that is, each L-shaped feeding structure is a port of the array unit, so Figure 1 and Figure 2 The self-decoupled multi-port antenna shown is a dual-port decoupling antenna; the feed probe in the same L-shaped feed structure can excite the feed patch, so that the feed patch is excited to produce a monopole mode. Since the multi-port antenna only excites one port at a time, the other ports are in an unexcited state or a coupled state. Therefore, the coupling current on the symmetrical patch (or the probe of the other port) is close to 0 at this time, thereby obtaining a good self-decoupling effect of the same port (such as Figure 3 As shown, a transmission zero can be generated at 27.1GHz. Figure 3 The S-parameters in the equation represent the scattering coefficient, and Frequency represents the frequency) and a stable radiation pattern [such as Figure 4 By introducing the first parasitic patch group, two of the parasitic patches can be excited by the L-shaped feeding structure to generate a patch mode loaded by the dielectric block DRA, which is superimposed with the third-order mode of the dielectric block DRA, thereby generating a weak field region at the feeding probe of the coupled L-shaped feeding structure, thereby obtaining a good self-decoupling effect between ports in this frequency band (such as Figure 3 As shown, the second transmission zero can be generated at 29.4 GHz), so the introduction of the first parasitic patch group greatly expands the impedance bandwidth and decoupling bandwidth performance of the self-decoupling multi-port antenna.

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

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

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

[0053] In this embodiment, by setting the second parasitic patch group, a stable radiation pattern under high frequency conditions can be obtained [such as Figure 4 as shown in part (c) of ].

[0054] like Figure 3 As shown in FIG. 1 , the -10 dB impedance bandwidth and 20 dB isolation bandwidth (decoupling bandwidth) of the dual-port decoupling antenna reach 14.6% (25.85-29.93 GHz) and 14.1% (25.86-29.82 GHz), respectively. Figure 4 As shown, the dual-port decoupling antenna has a stable radiation pattern within the passband, and the cross-polarization is controlled in a lower range, showing excellent radiation performance.

[0055] Embodiment 2: Six-port decoupling antenna

[0056] In this embodiment, the structure of the self-decoupling multi-port antenna when three cavities and three array units are provided is as follows: Figure 5 and Figure 6 As shown, Figure 5 is an isometric view. Figure 6 It is a top view.

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

[0058] Since in the embodiment of the dual-port decoupling antenna, it is explained that one array element can form a dual-port decoupling antenna, Figure 5 and Figure 6 The self-decoupled multi-port antenna in the embodiment has three array elements, so Figure 5 and Figure 6 The self-decoupled multi-port antenna shown is a six-port decoupled antenna.

[0059] When a six-port decoupling antenna is obtained by arranging a plurality of array units, the dielectric block in each array unit may not be provided with the first parasitic patch group and the second parasitic patch group.

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

[0061] In this embodiment, Figure 5 and Figure 6 The self-decoupling multi-port antenna with three array units shown in the figure has a working principle as follows: the six-port self-decoupling antenna is equivalent to being composed of three dual-port self-decoupling antennas (the dual-port decoupling antenna can be regarded as an array unit, so the six-port antenna is composed of three units), and according to the embodiment of the dual-port self-decoupling antenna, the two ports of each dual-port self-decoupling antenna have completed self-decoupling, so only the isolation between the array units needs to be considered in the six-port self-decoupling antenna; assuming that the three array units are directly arranged together with a spacing of 0.49λ0 without any optimization design, the isolation between the array units is only about 10dB; and as shown in FIG. Figure 5 and Figure 6 As shown, by adding symmetrical rectangular short-circuit patches on the surfaces of both sides of the dielectric block in each array unit, the propagation of the coupled electromagnetic field in the dielectric between the array units can be suppressed, thereby obtaining an isolation improvement of about 6dB, so that the isolation between array units reaches about 17dB. The provision of short-circuit patches will not increase the complexity and cost of the system, nor will it cause deformation, distortion or deflection of the radiation pattern, and the effect on the gain is also minimal.

[0062] In this embodiment, refer to Figure 5 Between any pair of adjacent array units, there is a portion of substrate material used to separate the two cavities, and this portion of the substrate is also provided with an upper metal floor and a lower metal floor. Figure 5 For the upper metal floor of this part of the substrate material, the metal material is removed from the connection position between it and other parts of the metal floor (that is, the main part of the metal floor located at the periphery of the substrate), and no metal through-holes are set in this part of the substrate material, so that this part has a gap due to the lack of the upper metal floor and the metal through-holes.

[0063] In this embodiment, the upper metal floor is slotted to obtain slots, which can form a leaky wave structure, thereby further improving the isolation between adjacent array units by 5 dB, and ultimately making the isolation between all ports of the six-port self-decoupling antenna greater than 20 dB (e.g. Figure 7 ), and the radiation patterns of all ports are stable (as shown Figure 8 shown).

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

[0065] Embodiments 1 and 2 do not require additional decoupling structures to achieve decoupling of multi-port antennas and maintain the stability of the directional pattern. For example, the dual-port decoupling antenna structure in Embodiment 1 is very simple. On a single-layer substrate, dielectric blocks, metal cavities, L-shaped feeding structures, parasitic patches and other structures are integrated to obtain a broadband self-decoupling effect, and the radiation patterns of the two ports are very stable, with excellent radiation performance; the six-port decoupling antenna in Embodiment 2 has a simple structure. On a single-layer substrate, three dual-port decoupling antennas are integrated without adding additional decoupling structures, so that the isolation between all ports is greater than 20dB, and the radiation patterns of all ports are stable, with excellent radiation performance.

[0066] Based on the principles of Example 1 and Example 2, N cavities and N array units may be arranged on the substrate to form a 2N-port decoupling antenna, thereby achieving an expansion of the number of ports.

[0067] In this embodiment, after the cavity is prefabricated on the substrate, elastic dielectric material can be used as dielectric blocks to manufacture various array units. The number of array units to be used is determined according to the number of ports to be used, and the array units to be used are placed in the cavity on the substrate. The dielectric blocks in the array units rely on their own elastic force and the friction between the dielectric blocks and the inner wall of the cavity to remain fixed to the substrate, and the array units that are not needed can be taken out of the cavity, thereby realizing modular maintenance of the self-decoupled multi-port antenna and arbitrary expansion of ports.

[0068] The 2N-port decoupling antenna in this embodiment has a simple structure, only one layer of substrate, a low profile (only 0.06λ0), and is easier to integrate; no additional decoupling structure is required, the complexity and cost of the system will not be increased, no additional loss will be introduced, and the directional pattern will not be deformed, twisted or deflected; the design frequency band of the general multi-input multi-output antenna is limited to around 3.5GHz, while the operating frequency of the 2N-port decoupling antenna in this embodiment can be as high as around 28GHz. Compared with the 3.5GHz low-frequency antenna, the millimeter wave antenna is more difficult to design and process, but the millimeter wave antenna has the advantages of high bandwidth, low latency, large capacity, and fast speed. Therefore, the millimeter wave antenna realized by the 2N-port decoupling antenna in this embodiment is of great significance; the 2N-port decoupling antenna in this embodiment can simply expand the number of ports (N is a positive integer), has a wide range of applicability, and is of great significance for the design of large-scale MIMO antennas.

[0069] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present disclosure are only relative to the relative positional relationship of the components of the present disclosure in the accompanying drawings. The singular forms of "a" and "the" used in the present disclosure are also intended to include the plural forms, unless the context clearly indicates other meanings. In addition, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as those generally understood by technicians in this technical field. The terms used in the specification of this embodiment are only for describing specific embodiments, not for limiting the present invention. The term "and / or" used in this embodiment includes any combination of one or more related listed items.

[0070] It should be understood that, although the term first, second, third etc. may be adopted to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish the same type of elements from each other. For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element. The use of any and all examples or exemplary language ("for example", "such as" etc.) provided by the present embodiment is only intended to better illustrate embodiments of the present invention, and unless otherwise required, the scope of the present invention will not be limited.

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

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

[0073] Further, the method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented in 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, an optical read and / or write storage medium, a RAM, a ROM, etc., so that it can be read 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 process described herein. In addition, the machine-readable code, or part thereof, can be transmitted via a wired or wireless network. When such media includes instructions or programs that implement the above steps in conjunction with a microprocessor or other data processor, the invention of this embodiment includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0074] The computer program can be applied to input data to perform the functions of the present embodiment, thereby converting the input data to generate output data stored in a 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 present invention, the converted data represents a physical and tangible object, including a specific visual depiction of the physical and tangible object produced on the display.

[0075] The above are only preferred embodiments of the present invention. The present invention is not limited to the above embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. Within the scope of protection of the present invention, its technical solutions and / or implementation methods may have various modifications and changes.

Claims

1. A self-decoupling multi-port antenna, characterized in that: The self-decoupling multi-port antenna comprises a substrate and at least one array unit, wherein at least one cavity is provided on the substrate, and the array unit comprises: A dielectric block; the dielectric block is arranged in the cavity; Two L-shaped feeding structures; the L-shaped feeding structures are arranged on the dielectric block; A first parasitic patch group; the first parasitic patch group includes two parasitic patches, and the first parasitic patch group is arranged on the surface of the dielectric block.

2. The self-decoupling multi-port antenna according to claim 1, characterized in that: The array unit also includes: A plurality of metal through holes are arranged on the substrate and surround the dielectric block.

3. The self-decoupling multi-port antenna according to claim 1, characterized in that: The array unit also includes: at least one second parasitic patch group; the second parasitic patch group includes two parasitic patches, and the second parasitic patch group is arranged on the surface of the dielectric block; The connection line formed between two parasitic patches in the first parasitic patch group and the connection line formed between two parasitic patches in any group of the second parasitic patch group are both perpendicular to the connection line formed between the two L-shaped feeding structures.

4. The self-decoupling multi-port antenna according to claim 1, characterized in that: The L-shaped feeding structure comprises a feeding patch and a feeding probe. The feeding patch is arranged on the surface of the dielectric block, and one end of the feeding probe is connected to the feeding patch.

5. The self-decoupling multi-port antenna according to claim 1, characterized in that: The dielectric block is provided with a side dielectric hollowing area and a middle dielectric hollowing area.

6. The self-decoupling multi-port antenna according to any one of claims 1 to 5, characterized in that: The self-decoupling multi-port antenna comprises a plurality of the array units, a plurality of the cavities are provided on the substrate, and any of the array units is arranged in a corresponding one of the cavities; Each of the array units is arranged along one direction; For any pair of adjacent array units, at least one of the array units is provided with a short-circuit patch on a side adjacent to the other array unit.

7. The self-decoupling multi-port antenna according to claim 6, characterized in that: Each of the array units is arranged along the H-plane direction; For any of the array units, the short-circuit patches are respectively provided on both sides of the array unit in the arrangement direction.

8. The self-decoupling multi-port antenna according to claim 7, characterized in that: The array units are arranged at equal intervals, and the distance between any pair of adjacent array units is determined according to the center frequency wavelength of the self-decoupling multi-port antenna.

9. The self-decoupling multi-port antenna according to claim 6, characterized in that: An upper metal floor is arranged on one side of the substrate, and a lower metal floor is arranged on the other side.

10. The self-decoupling multi-port antenna according to claim 8, characterized in that: A gap is provided at the connection between the portion of the upper metal floor located between any pair of adjacent array units and other portions of the upper metal floor.

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