Hybrid mode dual wideband self-decoupled MIMO antenna and terminal device

Abstract

The application relates to the technical field of wireless communication, in particular to a double-wide-band self-decoupling MIMO antenna based on a hybrid mode and a terminal device, the antenna comprising a grounding plate, a feed port and a metal branch radiator, a slit radiator for controlling mutual transformation between a double-frequency-band self-decoupling MIMO antenna and a wide-band self-decoupling MIMO antenna being arranged on the metal branch radiator, the slit radiator comprising a first slit and a second slit, so that the metal branch radiator is formed with a neutral line connecting structure between the first slit and the second slit, the neutral line connecting structure is used for introducing a coupling cancellation path, and the coupling cancellation path and an original coupling path of the antenna are mutually cancelled. The application introduces the slit radiator and the coupling cancellation path, so that the antenna has two different working modes, the coupling cancellation path and the original coupling path of the antenna are mutually cancelled, the application is suitable for various 5G communication occasions, and has the advantages of simple structure, low manufacturing cost and the like.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a hybrid-mode dual-wideband self-decoupling MIMO antenna and terminal device. Background Technology

[0002] With the development of mobile communication technology, 5G has received increasing attention due to its advantages of high speed and low latency. Among them, Multiple-Input Multiple-Output (MIMO) technology has great advantages in improving spectrum efficiency, signal stability, and channel capacity, and is a key supporting technology for 5G / B5G. In order to meet the requirements of 5G technology, the antenna arrangement in mobile devices is becoming more and more compact. The limited antenna space leads to insufficient signal isolation between antennas and serious coupling between antennas, resulting in serious electromagnetic interference. At the same time, since various communication systems coexist in a limited space and operate in similar frequency bands, the serious antenna coupling seriously affects the radiation performance of antennas and the communication rate of the entire communication system. To solve the many problems caused by antenna coupling, antenna decoupling has become a key focus.

[0003] Currently, the main methods to improve antenna decoupling include the following:

[0004] (1) Neutralization line method: The neutralization line method connects a piece of metal wire to a suitable position of two mutually coupled antennas to neutralize and remove the antenna coupling;

[0005] (2) Adding parasitic structures between coupled antennas: Since the parasitic unit resonates in the antenna's operating frequency band, an additional coupling path can be introduced between the two antennas to achieve coupling cancellation. At the same time, the antenna can be miniaturized by loading a circuit at the end of the parasitic unit.

[0006] (3) Introducing a decoupled network: The method of introducing a decoupled network is to load a decoupled network structure between the antenna port and the feed port to achieve the decoupling effect between the units;

[0007] (4) Introducing a trench structure: A trench is cut in the floor of the coupled antenna to achieve resonance in the operating frequency band and thus cancel out the antenna coupling;

[0008] (5) Self-decoupling method: The self-decoupling method reduces coupling by arranging the components themselves or by utilizing the orthogonal characteristics of two antennas, without the need for additional structures to achieve high isolation.

[0009] However, the traditional antenna decoupling methods mentioned above are mainly concentrated in a narrow frequency band or a single frequency band. The narrowband decoupling characteristics will face the problem that the applicable scenarios cannot be met when facing new 5G radio services. Therefore, in order to solve the above problems, it is urgent to provide a broadband high isolation antenna and a multi-band high isolation antenna. Summary of the Invention

[0010] This invention provides a hybrid-mode dual-wideband self-decoupling MIMO antenna and terminal device, which solves the technical problem that traditional decoupling antennas are mainly concentrated in a narrow frequency band or a single frequency band, and cannot be applied to 5G new radio service scenarios.

[0011] To address the above technical problems, this invention provides a hybrid-mode dual-wideband self-decoupling MIMO antenna and terminal device.

[0012] In a first aspect, the present invention provides a hybrid-mode dual-wideband self-decoupling MIMO antenna, the antenna comprising: a ground plane, a feed port, and a metal stub radiator disposed on the upper surface of the ground plane, the metal stub radiator being electrically connected to the ground plane through the feed port, the metal stub radiator having a slot radiator formed thereon, the slot radiator being a transverse strip-shaped slot located in the middle region of the metal stub radiator, the slot radiator being used to control the mutual conversion between the dual-band self-decoupling MIMO antenna and the wideband self-decoupling MIMO antenna;

[0013] The slot radiator includes a first slot and a second slot, such that the metal stub radiator forms a neutralization line connection structure between the first slot and the second slot. The neutralization line connection structure is used to introduce a coupling cancellation path so that the coupling cancellation path cancels out the original coupling path of the antenna.

[0014] In a further embodiment, the metal stub radiator includes a metal stub and a metal stub radiator body separated by the slot radiator, and the neutralization line connection structure is electrically connected between the metal stub and the metal stub radiator body;

[0015] The first gap and the second gap are arranged in a centrally symmetrical manner with the neutral line connection structure as the center.

[0016] In a further implementation, when the antenna is converted into a dual-band self-decoupling MIMO antenna, the operating mode of the dual-band self-decoupling MIMO antenna is determined according to the different antenna operating frequency bands.

[0017] In a further embodiment, the operating frequency band of the dual-band self-decoupling MIMO antenna covers the N78 and N79 frequency bands;

[0018] When the antenna operates in the N78 band, the dual-band self-decoupling MIMO antenna operates in dipole mode.

[0019] When the antenna operates in the N79 band, the dual-band self-decoupling MIMO antenna operates in slot mode.

[0020] In a further embodiment, the modulation of the dual-band self-decoupling MIMO antenna in the N79 band is related to the slot size of the slot radiator;

[0021] The modulation of the dual-band self-decoupling MIMO antenna in the N78 band is correlated with the size of the metal stub.

[0022] In a further implementation, when the antenna is converted into a wideband self-decoupling MIMO antenna, the operating mode of the wideband self-decoupling MIMO antenna is determined according to different antenna resonant frequencies.

[0023] In a further embodiment, the wideband self-decoupling MIMO antenna operates in a frequency band covering the wide N78 band;

[0024] When the antenna is at a low frequency resonant frequency, the wideband self-decoupling MIMO antenna operates in slot mode.

[0025] When the antenna is at a high frequency resonant frequency, the wideband self-decoupling MIMO antenna operates in monopole mode.

[0026] In a further embodiment, when the dual-band self-decoupling MIMO antenna or the wideband self-decoupling MIMO antenna operates in slot mode, the length of the slot radiator is one-quarter of the wavelength corresponding to the required resonant frequency of the antenna.

[0027] In a further embodiment, the length of the metal stub is less than the length of the metal stub radiator body, so that the broadband self-decoupling MIMO antenna has two frequency points within the wide N78 frequency band.

[0028] In a second aspect, the present invention provides a terminal device, the terminal device including the hybrid-mode dual wideband self-decoupling MIMO antenna as described above.

[0029] This invention provides a hybrid-mode dual-wideband self-decoupling MIMO antenna and terminal device. The antenna includes a ground plane, a feed port, and a metal stub radiator disposed on the upper surface of the ground plane. The metal stub radiator has slot radiators for controlling the conversion between the dual-band self-decoupling MIMO antenna and the wideband self-decoupling MIMO antenna. The slot radiator includes a first slot and a second slot, forming a neutralization line connection structure between the first and second slots. This neutralization line connection structure introduces a coupling cancellation path, allowing the coupling cancellation path to cancel out the original coupling path of the antenna. Compared with existing technologies, this method, by introducing a slot radiator, enables the antenna to have two different operating modes. Simultaneously, the neutralization line connection structure formed between the first and second slots introduces a coupling cancellation path, allowing the coupling cancellation path to cancel out the original coupling path of the antenna, achieving high isolation characteristics for the dual-wideband self-decoupling MIMO antenna. This method is suitable for various 5G communication applications and has practical application value and significant importance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the shared radiator antenna pair structure provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of a dual-band self-decoupling MIMO antenna based on a hybrid mode according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of a broadband self-decoupling MIMO antenna based on a hybrid mode, provided in another embodiment of the present invention;

[0033] Figure 4 This is the return loss (S) of a shared radiator antenna pair and a hybrid-mode dual-band self-decoupling MIMO antenna provided in one embodiment of the present invention. 11 ) and isolation (S 21 Simulation comparison diagram;

[0034] Figure 5 This is a schematic diagram comparing the simulated and measured return loss and isolation of a broadband self-decoupling MIMO antenna based on hybrid mode, provided by another embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the radiation efficiency curve of a dual-band self-decoupling MIMO antenna based on a hybrid mode, provided in one embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the radiation efficiency curve of a broadband self-decoupling MIMO antenna based on a hybrid mode, provided in another embodiment of the present invention. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The embodiments are given for illustrative purposes only and should not be construed as limiting the present invention. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0038] Figure 1 It provides a slotless, shared radiator antenna pair as the basic structure for a dual-wideband self-decoupling MIMO antenna. It should be noted that... Figure 1 The slotless antenna shown does not introduce a slot in the metal stub radiator 1 and has only a single radiation mode. Therefore, in order to achieve dual-wideband decoupling of the antenna, this embodiment of the invention introduces a slot structure to realize a dual-wideband self-decoupling MIMO antenna based on a hybrid mode, as shown below. Figure 2 , 3 As shown, this embodiment provides a hybrid-mode dual-wideband self-decoupling MIMO antenna, comprising: a ground plane, a feed port, and a metal stub radiator disposed on the upper surface of the ground plane. The metal stub radiator is electrically connected to the ground plane through the feed port. Excitation enters the antenna through the feed port. The feed port includes a first feed port Port1 and a second feed port Port2, which are identical. The first feed port Port1 and the second feed port Port2 are used to regulate the coupling between the two ports at low frequencies. For example, when the first feed port Port1 is excited, the distance between the two ports is adjusted so that the corresponding position of the second feed port Port2 is a zero current point. Therefore, no coupling current will flow to the second feed port Port2, thus achieving decoupling. In this embodiment, the ground plane size is preferably set to 80*30mm. 2 It should be noted that the grounding plate size in this embodiment is only an illustrative example, and those skilled in the art can set it according to the actual implementation situation, and it is not limited to the embodiment of the present invention.

[0039] The metal stub radiator is centrally symmetrical along its longitudinal centerline. A slot radiator is formed on the metal stub radiator, which controls the conversion between a dual-band self-decoupling MIMO antenna and a wideband self-decoupling MIMO antenna. Specifically, the conversion between the dual-band self-decoupling MIMO antenna and the wideband self-decoupling MIMO antenna is achieved by controlling the slot size of the slot radiator and fine-tuning the dimensions of the remaining parts of the antenna. It should be noted that the overall structure of the metal stub radiator in the dual wideband self-decoupling MIMO antenna can be a π-shaped antenna or other antenna structures, and is not limited to the embodiments of this invention.

[0040] like Figure 2 , 3 As shown, in this embodiment, the slot radiator is a transverse strip slot located in the central region of the metal stub radiator. The slot radiator includes a first slot 2 and a second slot 3, so that a neutralization line connection structure 4 is formed between the first slot 2 and the second slot 3. The first slot 2 and the second slot 3 are quarter-wavelength slot antennas. In this embodiment, the resonant frequency is adjusted by controlling the length of the slot. The size of the slot is adjusted by changing the length of the main body of the metal stub radiator and the length of the neutralization line connection structure. According to the wavelength corresponding to the resonant frequency, the adjustment is made to satisfy the quarter-wavelength resonance condition. The first and second slots are arranged symmetrically around the neutralization line connection structure. In this embodiment, the metal stub radiator is separated into a metal stub 11 and a metal stub radiator body 12 by the slot radiator. From the longitudinal centerline of the ground plane, the neutralization line connection structure 4 is electrically connected between the metal stub 11 and the metal stub radiator body 12. In this embodiment, the neutralization line connection structure 4 is used to introduce a coupling cancellation path so that the coupling cancellation path cancels out the original coupling path of the antenna. For example, when the first slot is working, a coupling current will pass through this neutralization line connection structure to reach the second slot.

[0041] In this embodiment, the metal stub is a metal stub radiator located above the neutralization line connection structure, and the main body of the metal stub radiator is a metal stub radiator located below the neutralization line connection structure. The length of the metal stub is L1 and the width is W1, the length of the neutralization line connection structure is L2, and the length of the main body of the metal stub radiator is L3 and the width is E2. Since the antenna only has a single radiation mode when the first slot 2 and the second slot 3 are not present (i.e., when the antenna has no slots), this embodiment introduces the first slot 2 and the second slot 3 to allow the antenna to have multiple radiation modes. The lengths of the metal stub above and below the slots and the main body of the metal stub radiator are different. Due to the difference in length between the two slots, the metal stub radiator forms a metal stub after the slots are introduced. The metal stub is connected to the main body of the metal stub radiator through the neutralization line connection structure, thereby canceling out the coupling cancellation path introduced by the neutralization line connection structure with the original coupling paths of the two antennas, and introducing two different radiation modes.

[0042] The dual wideband self-decoupling MIMO antenna provided in this embodiment includes a dual-band self-decoupling MIMO antenna or a wideband self-decoupling MIMO antenna that achieves mutual conversion through a slot radiator. In order to facilitate a detailed explanation of the hybrid mode of the dual-band self-decoupling MIMO antenna or the wideband self-decoupling MIMO antenna, the dual-band self-decoupling MIMO antenna or the wideband self-decoupling MIMO antenna will be described separately below.

[0043] In one embodiment, when the antenna is converted into a dual-band self-decoupling MIMO antenna, the neutralization line connection structure between the first slot 2 and the second slot 3 introduces an additional coupling cancellation path that cancels out the original coupling paths of the two antennas, thus achieving dual-band decoupling of the entire antenna. This adds a new operating frequency band (i.e., the N79 band) and achieves high isolation within the N79 band. At this point, the antenna introduces a new radiation mode, namely the slot mode, thereby enabling the dual-band self-decoupling MIMO antenna to achieve two different radiation modes (i.e., operating modes): dipole mode and slot mode. In this embodiment, the dual-band self-decoupling... The MIMO antenna operates in the N78 band (3.4GHz~3.6GHz) and the N79 band (4.8GHz~5GHz). The operating mode of the dual-band self-decoupling MIMO antenna is determined according to the different antenna operating frequency bands. Specifically, when the antenna operates in the N78 band, the dual-band self-decoupling MIMO antenna operates in dipole mode; when the antenna operates in the N79 band, the dual-band self-decoupling MIMO antenna operates in slot mode.

[0044] It should be noted that when the antenna is converted into a dual-band self-decoupling MIMO antenna, the dual-band self-decoupling MIMO antenna can autonomously adjust the antenna's operating frequency band. When the antenna's operating frequency band is the N78 band and the radiation mode is the dipole mode, the size change of the metal stub has a significant impact on the S-parameters (return loss and isolation) of the N78 band. The size change of the slot radiator (first slot and second slot) has a smaller impact on the S-parameters (return loss and isolation) of the N78 band. When the slot length decreases, the return loss and isolation curves of the antenna change less in the N78 band and the frequency point shifts to higher frequencies in the N79 band.

[0045] Meanwhile, when the antenna is converted into a dual-band self-decoupling MIMO antenna, when the antenna operates in the N79 band and the radiation mode is slotted mode, the slot size of the slot radiator has a significant impact on the control of the N79 band, while the change in the length of the metal stub has a smaller impact on the control of the S-parameters (return loss and isolation) of the N79 band. When the length of the metal stub increases, the return loss and isolation curves of the antenna shift to lower frequencies within the N78 band. Therefore, in this embodiment, when the dual-band self-decoupling MIMO antenna operates in slotted mode, the control of the dual-band self-decoupling MIMO antenna in the N79 band is correlated with the slot size of the slot radiator. The length is one-quarter of the wavelength corresponding to the required resonant frequency of the antenna. In this embodiment, the length range of the dual-band self-decoupling MIMO antenna operating in slot mode is determined based on the antenna's operating frequency band and operating frequency. If the antenna's operating frequency increases, the length of the dual-band self-decoupling MIMO antenna operating in slot mode needs to be reduced. In this case, based on the obtained antenna length range, this embodiment can control the antenna to operate in a new frequency band by adjusting the slot size of the slot radiator and fine-tuning the dimensions of the remaining parts of the antenna. For example, if the required high-frequency operating band of the antenna is 5.4GHz to 5.6GHz, and the low-frequency operating band remains the N78 band, since the relationship between wavelength λ, frequency f, and wave velocity v is... The slit length of the slit radiator is Therefore, in order to increase the operating frequency of the antenna, it is necessary to reduce the length of the gap. At the same time, in order to ensure the high isolation of the antenna, it is necessary to fine-tune the dimensions of other antenna structures.

[0046] Meanwhile, when the dual-band self-decoupling MIMO antenna operates in dipole mode, the modulation of the dual-band self-decoupling MIMO antenna in the N78 band is related to the size of the metal stub. The length of the main body of the metal stub radiator is half the wavelength of the antenna's operating wavelength. In this embodiment, the length range of the dual-band self-decoupling MIMO antenna operating in dipole mode is determined according to the antenna's operating frequency band and operating frequency. If the antenna's operating frequency increases, the length of the dual-band self-decoupling MIMO antenna operating in dipole mode needs to be reduced. At this time, in this embodiment, based on the obtained antenna length range, the antenna can be controlled to operate in a new frequency band by adjusting the size of the metal stub radiator and fine-tuning the size of the remaining parts of the antenna.

[0047] The dual-band self-decoupling MIMO antenna based on hybrid mode provided in this embodiment of the invention radiates in dipole mode in one frequency band and in slot mode in another frequency band. This embodiment achieves high isolation in one frequency band by adjusting the spacing between the feed ports so that when one feed port is excited, the other feed port is at the corresponding null position. At the same time, this embodiment introduces a coupling cancellation path through the neutralization line connection structure between the first slot and the second slot, so that the coupling cancellation path cancels out the original coupling path of the antenna, achieving high isolation in another high frequency band.

[0048] In another embodiment, when the antenna is converted into a wideband self-decoupling MIMO antenna, the operating frequency band of the wideband self-decoupling MIMO antenna covers the wide N78 band (3.3GHz to 3.8GHz). The introduction of the slot radiator structure enables the entire antenna to achieve wideband decoupling, and at the same time enables the wideband self-decoupling MIMO antenna to achieve two different radiation modes: monopole mode and slot mode. The operating mode of the wideband self-decoupling MIMO antenna is determined according to different antenna resonant frequencies. That is, the wideband self-decoupling MIMO antenna operates in different modes when it is at different resonant frequencies. Specifically, when the antenna is at a low resonant frequency, the wideband self-decoupling MIMO antenna operates in slot mode; when the antenna is at a high resonant frequency, the wideband self-decoupling MIMO antenna operates in monopole mode.

[0049] In this embodiment, when the wideband self-decoupling MIMO antenna operates in slot mode, the slot length of the slot radiator is one-quarter wavelength of the required resonant frequency of the antenna. To achieve wideband decoupling and switch the slot mode to the N78 band, the slot length needs to be increased. Compared with the dual-band self-decoupling MIMO antenna, the wideband self-decoupling MIMO antenna requires readjustment of the two feed ports, the main body of the metal stub radiator, the slot radiator, the neutral line connection structure, and the length and width of the metal stub. No additional antenna structure is required. During the adjustment process, all components are on the same plane as the ground and symmetrically distributed along the center line of the ground. At the same time, to ensure that the antenna isolation curve still has two frequency points in the wide N78 band, the length L1 of the metal stub needs to be less than the length L3 of the main body of the metal stub radiator. Since the radiation mode of the metal stub and the radiation mode of the slot are different, they achieve good compatibility in the wide N78 band, thus satisfying the requirements of isolation and matching at the two resonant points.

[0050] The broadband self-decoupling MIMO antenna based on hybrid mode provided in this application integrates two frequency bands by adjusting the distance between the slots and the length of the slots to form a broadband self-decoupling MIMO antenna, so that the working mode of the broadband self-decoupling MIMO antenna is a hybrid mode of monopole mode and slot mode.

[0051] Figure 4 This is a simulation comparison diagram of return loss and isolation between a shared radiator antenna pair and a hybrid-mode dual-band self-decoupling MIMO antenna. Figure 4 As can be seen, in the embodiments of the present invention, the S of the dual-band self-decoupling MIMO antenna 21 The isolation parameter is generally greater than 20dB in both frequency bands, achieving decoupling and conforming to the high isolation characteristics of self-decoupling technology. Simultaneously, the S... 11 The return loss parameter is generally greater than 10dB in both the N78 and N79 frequency bands, indicating that the dual-band self-decoupling MIMO antenna achieves good antenna efficiency while maintaining high isolation. In contrast, the slotless shared radiator antenna pair only operates in a single frequency band, and compared to the dual-band self-decoupling MIMO antenna provided in this embodiment, the decoupling effect of the shared radiator antenna pair is poor. It should be noted that... Figure 4 The seamless curve shown is the S-curve of the unslotted shared radiator antenna pair. 11 Parameter curves and S 21 The parameter curve, the gapped curve, is the S-curve of the dual-band self-decoupling MIMO antenna. 11 Parameter curves and S 21 Parameter curve.

[0052] Figure 5 Simulated and measured return loss (S) of a hybrid-mode broadband self-decoupling MIMO antenna 11 ) and isolation (S 21 (Comparison diagram, by) Figure 5 It can be seen that the S-bandwidth self-decoupling MIMO antenna in this embodiment of the invention... 21 The isolation parameter is generally greater than 20dB across the wide N78 frequency band, achieving decoupling and conforming to the high isolation characteristics of self-decoupling technology. Simultaneously, the wideband self-decoupling MIMO antenna's S... 11 The return loss parameter is greater than 10dB across the wide N78 frequency band, indicating that this wideband self-decoupling MIMO antenna achieves good antenna efficiency while maintaining high isolation. Figure 5 It can be seen that the antenna is in two radiation modes within the wide N78 frequency band. When it is at the low frequency resonant point, the slot constitutes the slot mode; when it is at the high frequency resonant point, the antenna is in the monopole mode.

[0053] Figure 6 The radiation efficiency curve of a dual-band self-decoupling MIMO antenna based on hybrid mode is shown below. Figure 6 It can be seen that the dual-band self-decoupling MIMO antenna achieves good radiation performance in both frequency bands by arranging the antenna's own geometry.

[0054] Figure 7 The radiation efficiency curve of a broadband self-decoupling MIMO antenna based on hybrid mode is shown below. Figure 7 It can be seen that wideband self-decoupling MIMO antennas achieve good radiation performance in the operating frequency band by arranging the antenna's own geometry.

[0055] In one embodiment, the present invention provides a terminal device, which includes a hybrid-mode dual-wideband self-decoupling MIMO antenna as described above.

[0056] For specific limitations on a terminal device, please refer to the above limitations on a hybrid-mode dual-wideband self-decoupling MIMO antenna, which will not be repeated here.

[0057] This invention provides a hybrid-mode dual-wideband self-decoupling MIMO antenna and terminal device. The antenna includes a ground plane, a feed port, and a metal stub radiator. The metal stub radiator is electrically connected to the ground plane through the feed port. A slot radiator is formed on the metal stub radiator, which separates the metal stub radiator into a metal stub and a metal stub radiator body. The slot radiator is used to control the mutual conversion between the dual-band self-decoupling MIMO antenna and the wideband self-decoupling MIMO antenna. The slot radiator includes a first slot and a second slot, so that a neutralization line connection structure is formed between the first slot and the second slot. The neutralization line connection structure is used to introduce a coupling cancellation path so that the coupling cancellation path cancels out the original coupling path of the antenna. The dual-wideband self-decoupling MIMO antenna provided by this invention can achieve self-decoupling without the need for an additional decoupling structure, effectively improving the isolation and antenna efficiency of the dual-wideband self-decoupling MIMO antenna. It features simple antenna structure, low manufacturing cost and high isolation, and has broad application prospects in antenna design.

[0058] The embodiments described above are merely preferred embodiments of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various improvements and substitutions without departing from the technical principles of this invention, and these improvements and substitutions should also be considered within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the scope of the claims.

Claims

1. A dual-wideband self-decoupling MIMO antenna based on hybrid mode, characterized in that, The antenna includes: The device includes a ground plane, a feed port, and a metal stub radiator disposed on the upper surface of the ground plane. The metal stub radiator is electrically connected to the ground plane through the feed port. A slot radiator is provided on the metal stub radiator. The slot radiator is a transverse strip-shaped slot located in the middle region of the metal stub radiator. The slot radiator is used to control the mutual conversion between a dual-band self-decoupling MIMO antenna and a wideband self-decoupling MIMO antenna. The slot radiator includes a first slot and a second slot, such that the metal stub radiator forms a neutralization line connection structure between the first slot and the second slot. The neutralization line connection structure is used to introduce a coupling cancellation path so that the coupling cancellation path cancels out the original coupling path of the antenna. The metal stub radiator includes a metal stub and a metal stub radiator body separated by the slot radiator, and the neutralization line connection structure is electrically connected between the metal stub and the metal stub radiator body; The first gap and the second gap are arranged in a centrally symmetrical manner with the neutral line connection structure as the center; When the antenna is the dual-band self-decoupling MIMO antenna, the antenna's operating frequency band covers the N78 and N79 frequency bands; When the antenna operates in the N78 band, the antenna operates in dipole mode; when the antenna operates in the N79 band, the antenna operates in slot mode. When the antenna is the wideband self-decoupling MIMO antenna, the antenna's operating frequency band covers the wide N78 frequency band; When the antenna is at a low resonant frequency, the antenna operates in slot mode; when the antenna is at a high resonant frequency, the antenna operates in monopole mode.

2. The hybrid-mode dual-wideband self-decoupling MIMO antenna as described in claim 1, characterized in that: When the antenna is converted into a dual-band self-decoupling MIMO antenna, the operating mode of the dual-band self-decoupling MIMO antenna is determined according to the different antenna operating frequency bands.

3. The hybrid-mode-based dual-wideband self-decoupling MIMO antenna as described in claim 1, characterized in that: When the antenna is converted into a wideband self-decoupling MIMO antenna, the operating mode of the wideband self-decoupling MIMO antenna is determined according to different antenna resonant frequencies.

4. The hybrid-mode dual-wideband self-decoupling MIMO antenna as described in claim 1, characterized in that: When the dual-band self-decoupling MIMO antenna or the wideband self-decoupling MIMO antenna operates in slot mode, the length of the slot radiator is one-quarter of the wavelength corresponding to the required resonant frequency of the antenna.

5. A hybrid-mode-based dual-wideband self-decoupling MIMO antenna as described in claim 1, characterized in that: The length of the metal stub is less than the length of the main body of the metal stub radiator, so that the broadband self-decoupling MIMO antenna has two frequency points within the wide N78 frequency band.

6. A terminal device, characterized in that, Includes the hybrid-mode dual-wideband self-decoupling MIMO antenna as described in any one of claims 1-5.

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