terminal device

Abstract

This application provides a terminal device, which includes a main body, an antenna, and a conductive structure. The main body includes a first main body and a second main body. The first main body includes a first reference ground, and the second main body includes a second reference ground. In a folded state, the first reference ground and the second reference ground are stacked and form a cavity between them. The antenna is disposed on the frame of the main body. In the folded state, the conductive structure is located between the first main body and the second main body. The conductive structure includes a ground terminal and an open terminal arranged along a first direction. The conductive structure is related to the resonant frequency of the cavity and is used to tune the resonance of the cavity to the out-of-band of the antenna's operating frequency band. The conductive structure is used to reduce the influence of the cavity's resonant mode within the antenna's operating frequency band and improve the antenna's radiation efficiency.

Description

Technical Field

[0001] This invention relates to the field of mobile communication technology, and more particularly to a terminal device. Background Technology

[0002] In foldable terminal devices, the antenna can be mounted on the frame. When the device is folded, the two main components are stacked on top of each other, forming a cavity between them. This cavity can be understood as an insulating region between the two components. When the antenna is operational, a current distribution exists on the reference ground of the main components, generating a cavity resonance mode. This cavity resonance mode significantly impacts antenna efficiency. Therefore, reducing the impact of cavity resonance modes on antennas is a key research direction in the industry. Summary of the Invention

[0003] This application provides a terminal device that can reduce the impact of cavity resonance modes on antennas.

[0004] In a first aspect, embodiments of this application provide a terminal device, including a main body, an antenna, and a conductive structure. The main body includes a first main body and a second main body that can be folded and flattened relative to each other. The first main body includes a first reference ground, and the second main body includes a second reference ground. In a folded state, the first main body and the second main body form a cavity between them. The antenna is disposed on the edge of the main body. The conductive structure is located between the first main body and the second main body in the folded state. The conductive structure includes a ground terminal and an open terminal. The ground terminal is electrically connected to the first reference ground or the second reference ground. The conductive structure is related to the resonant frequency of the cavity and is used to tune the resonance of the cavity to the out-of-band of the operating frequency band of the antenna.

[0005] This application provides a terminal device with an antenna disposed on the frame of the main body. In the folded state, to address the impact of the cavity formed between the first and second main bodies on the radiation efficiency of the antenna, this application provides a conductive structure in the main body of the terminal device. The conductive structure is located between the first and second main bodies in the folded state. By designing a grounded end and an open end, the conductive structure can be correlated with the cavity resonant frequency of the terminal device in the folded state, and the cavity resonant frequency can be tuned to the out-of-band of the antenna's operating frequency band. This reduces the impact of the cavity resonant mode on the inner resonant frequency of the antenna's operating frequency band and improves the antenna's radiation efficiency.

[0006] In one possible implementation, the antenna operates in a first frequency band. When the antenna is in operation and the terminal device with the conductive structure is in a folded state, the cavity is excited to generate a first resonant mode. When the terminal device does not have the conductive structure and is in a folded state, the cavity is excited by the antenna to generate a second resonant mode. The resonant point of the cavity in the second resonant mode is located within the band of the first frequency band. This solution constrains the cavity resonant mode of the terminal device with the conductive structure to be the first resonant mode, and the cavity resonant mode of the terminal device without the conductive structure to be the second resonant mode. By constraining the relationship between the first and second resonant modes and the antenna's operating frequency band—that is, the resonant point of the first resonant mode is located outside the band of the first frequency band, and the resonant point of the second resonant mode is located outside the band of the first frequency band—it can be shown that the conductive structure is related to the resonant frequency of the cavity, thus having the function of tuning the cavity resonance.

[0007] In one possible implementation, the extension direction of the antenna frame is set as a first direction, and the arrangement direction of the grounding terminal and the open terminal is also set as the first direction. This solution constrains the arrangement direction of the grounding terminal and the open terminal of the conductive structure, as well as the extension direction of the antenna frame, to be the first direction. This allows the current in the conductive structure to directly affect the current in the first direction on the reference ground corresponding to the antenna. Since the current in the first direction on the reference ground significantly impacts the antenna's radiation efficiency, this solution is beneficial for improving the suppression of the influence of cavity resonance modes on the antenna.

[0008] In one possible implementation, the conductive structure is used to suppress the current distribution along the first direction on the first reference ground or the second reference ground, so that the resonant point of the cavity in the first resonant mode is located outside the first frequency band. This solution constrains the relationship between the conductive structure and the current distribution along the first direction on the first reference ground or the second reference ground. By suppressing the current distribution along the first direction on the first reference ground or the second reference ground, the problem of the cavity resonant mode affecting the antenna radiation efficiency can be better solved.

[0009] In one possible implementation, the frequencies within the antenna's operating frequency band include a minimum frequency and a maximum frequency. The side length of the first or second reference ground along a first direction is between half the electrical length of the wavelength corresponding to the minimum frequency and half the electrical length of the wavelength corresponding to the maximum frequency. This solution, by constraining the range of the side length of the first or second reference ground along the first direction, allows the antenna to be a low-frequency antenna. The conductive structure enables the cavity resonance to be tuned out of band within the antenna's operating frequency band, thereby improving the antenna's radiation efficiency.

[0010] In one possible implementation, the frequencies within the antenna's operating frequency band include a minimum frequency and a maximum frequency. The electrical length of the conductive structure extending along the first direction is between one-quarter of the electrical length of the wavelength corresponding to the minimum frequency and one-quarter of the electrical length of the wavelength corresponding to the maximum frequency. The arrangement of the conductive structure is equivalent to a series loading on the reference ground. When the electrical length of the conductive structure along the first direction is close to 1 / 4 wavelength, its open end is in a high-impedance state, equivalent to an inductor when the frequency is below the resonant point, and equivalent to a capacitor when the frequency is above the resonant point. This scheme, by constraining the length range of the conductive structure along the first direction, helps to ensure that when the antenna operates near the resonant point frequency, the open end of the conductive structure is in a high-impedance state. This helps to suppress the current of the first or second main body, effectively reducing the influence of the cavity's resonant mode within the antenna's operating frequency band and improving the antenna's radiation efficiency.

[0011] In one possible implementation, the antenna operates in a frequency range of 0.7 GHz to 0.96 GHz. The antenna provided in this solution can cover three frequency bands: B28, B5, and B8, with a minimum operating frequency of 0.7 GHz and a maximum operating frequency of 0.96 GHz.

[0012] In one possible implementation, both the antenna and the conductive structure are located on the first main body, and the grounding terminals of the antenna and the conductive structure are connected to the same location on the first reference ground. This solution, by constraining the grounding terminals of the antenna and the conductive structure to be in the same location, results in weak coupling between the antenna and the conductor, preventing the antenna power from being allocated to the conductive structure and minimizing the impact of the conductive structure on the antenna's radiation performance. If the grounding terminals of the antenna and the conductive structure are not in the same location, the coupling between them is stronger, leading to some power being allocated to the conductive structure. The antenna returns to ground from its own grounding terminal, and some energy is coupled to the conductive structure and then back to ground, affecting the antenna's performance and causing a performance degradation.

[0013] In one possible implementation, the antenna is disposed on the first main body, the conductive structure is disposed on the second main body, the grounding terminal of the antenna is connected to the first reference ground, and the grounding terminal of the conductive structure is connected to the second reference ground. The antenna and the grounding terminal of the conductive structure provided by this solution do not need to be connected to the same location. The grounding terminal of the conductive structure can be flexibly set at any location of the second reference ground, which is beneficial for adapting the conductive structure according to the actual space of the terminal device.

[0014] In one possible implementation, the first main body includes a first back cover, and the second main body includes a second back cover. Both the first and second back covers are made of insulating material. In the folded state, the first and second back covers are stacked between the first reference ground and the second reference ground. This solution constrains the back covers of the first and second main bodies to be located between two reference grounds in the folded state. The first and second back covers are made of insulating material and are also part of the cavity.

[0015] In one possible implementation, the first body includes a first back cover, which is made of insulating material. In the folded state, the first back cover is stacked between the first reference ground and the second reference ground. This solution constrains the back cover of the first body in the folded state to be located between the two reference grounds, and the first back cover is made of insulating material and is part of the cavity.

[0016] In one possible implementation, the second body includes a second back cover made of insulating material. In the folded state, the second back cover is stacked between the first reference ground and the second reference ground. This solution constrains the back cover of the second body in the folded state to be located between the two reference grounds, and the second back cover is made of insulating material and is part of the cavity.

[0017] Secondly, embodiments of this application provide a terminal device, including a main body, an antenna, and a conductive structure. The main body includes a first main body, a second main body, and a pivot. The first main body and the second main body are connected by the pivot and can be folded and flattened relative to each other. The edge of the first main body includes a first short side and a first long side. The first short side is connected between one end of the pivot and the first long side. The edge of the second main body includes a second short side and a second long side. The second short side is connected between one end of the pivot and the second long side. Both the first long side and the second long side are disposed opposite to the pivot and their extending directions are both a first direction. The first main body includes a first reference ground, and the second main body includes a second reference ground. In the folded state, a cavity is formed between the first main body and the second main body. The antenna is disposed on either the first long side or the second long side. In the folded state, the conductive structure is located between the first main body and the second main body. The conductive structure includes a ground terminal and an open terminal, which are arranged along the first direction.

[0018] This solution provides a specific terminal architecture. By setting a conductive structure and arranging the ground and open ends of the conductive structure in the same direction as the extension direction of the first or second long side where the antenna is located, the conductive structure can be related to the cavity resonant frequency of the terminal device in the folded state. It can also tune the cavity resonant frequency to the out-of-band of the antenna's operating frequency band, thereby reducing the impact of the cavity resonant mode on the inner resonant frequency of the antenna's operating frequency band and improving the antenna's radiation efficiency.

[0019] In one possible implementation, the first main body includes a battery compartment retaining wall, which is adjacent to the frame where the antenna is located. The gap between the battery compartment retaining wall and the frame where the antenna is located forms a receiving cavity, and the conductive structure is located within the receiving cavity. In this solution, the receiving cavity is the unused space between the battery compartment retaining wall and the first frame. This space is relatively narrow and cannot accommodate other components of the terminal device. This solution utilizes the receiving cavity to place the conductive structure, which on the one hand allows the conductive structure to be closer to the radiator of the antenna, and on the other hand utilizes the unused space of the receiving cavity, without occupying additional space in the thickness of the terminal device, thus facilitating the design of a thinner terminal device.

[0020] In one possible implementation, the terminal device further includes a tuning structure located at the open end of the conductive structure and electrically connected to the conductive structure. The tuning structure is used to adjust the electrical length of the conductive structure. This solution, by setting a tuning structure, enables the conductive structure to better tune the cavity resonance mode generated by the cavity during antenna operation, reducing the impact of the cavity resonance mode within the antenna's operating frequency band and improving the antenna's radiation efficiency.

[0021] In one possible implementation, the tuning structure includes a circuit board and a tuning device disposed on the circuit board. The circuit board is located at the open end of the conductive structure, and the tuning device is electrically connected between the conductive structure and ground. This solution, by placing the tuning device on the circuit board and positioning the circuit board at the open end, allows the tuning device to adjust the impedance of the conductive structure during antenna operation. This avoids the conductive structure's inability to effectively suppress the operating current of the first or second main body during antenna operation due to insufficient size, which is beneficial for tuning the cavity resonance mode generated by the conductive structure during antenna operation and improves the overall efficiency of the antenna.

[0022] In one possible implementation, the antenna is disposed on the frame of the first main body, and the display screen of the terminal device includes a first display portion connected to the first main body. In the folded state, the first display portion is located between the first main body and the second main body. The conductive structure is located at the edge of the first display portion and is electrically connected to the first reference ground. This solution, by setting the conductive structure on the outer surface of the edge of the first display portion, utilizes the edge position of the display screen to suppress cavity resonance without introducing additional components, while maintaining the PEC boundary conditions of the first reference ground.

[0023] In one possible implementation, the terminal device includes an insulating shell located at the edge of the first display portion, and the conductive structure is located on the outer surface of the insulating shell. This solution provides a specific configuration for the conductive structure. By setting the conductive structure on the outer surface of the insulating shell, and utilizing the surface characteristics of the insulating shell, without introducing additional components, the PEC boundary conditions of the first reference ground are altered. This allows the conductive structure to suppress the surface currents of the relatively folded first and second bodies, thereby tuning the resonant modes generated by the cavity during antenna operation and improving the overall efficiency of the antenna.

[0024] In one possible implementation, the terminal device further includes a tuning structure located at the open end of the conductive structure and electrically connected between the open end and the first reference ground. The tuning structure can adjust the electrical length of the conductive structure. It also facilitates tuning the resonant mode of the cavity.

[0025] In one possible implementation, the terminal device includes a surface structure covering the insulating shell, the surface structure being an insulating material, and the conductive structure located between the surface structure and the insulating shell. The surface structure serves to protect the conductive structure and also provides integrity and consistency to the surface structure of the terminal device.

[0026] In one possible implementation, the first main body includes a first back cover, and the second main body includes a second back cover, both the first and second back covers being made of insulating material; the conductive structure is stacked with the first back cover and covers most of the area of ​​the first back cover; or, the conductive structure is stacked with the second back cover and covers most of the area of ​​the second back cover. This solution, by combining the conductive structure with the first back cover, allows the conductive structure to have a wider dimension, which can improve the strength of the first back cover while resolving cavity resonance modes. Similarly, by combining the conductive structure with the second back cover, this solution allows the conductive structure to have a wider dimension, which can improve the strength of the second back cover while resolving cavity resonance modes.

[0027] In one possible implementation, the conductive structure includes a conductive body and a slot on the conductive body. The slot is used to adjust the resonant frequency of the cavity resonant mode, so that the conductive structure can better tune the cavity resonant mode generated by the cavity when the antenna is working, reduce the influence of the cavity resonant mode in the antenna's operating frequency band, and improve the antenna's radiation efficiency.

[0028] In one possible implementation, the conductive structure includes a first conductive structure and a second conductive structure. The first conductive structure is disposed in the first main body, which includes a battery compartment baffle. The battery compartment baffle, the frame where the antenna is located, and a portion of the edge area of ​​the display screen of the terminal device together form a receiving cavity, and the first conductive structure is located within the receiving cavity. The second conductive structure is disposed in the second main body, and the grounding terminal of the second conductive structure is connected to the second reference ground. The second conductive structure and the second back cover of the second main body are stacked and cover most of the area of ​​the second back cover. This solution, by setting the first and second conductive structures within the cavity, can more effectively tune the cavity resonance mode generated by the cavity when the antenna is working, thereby improving the overall efficiency of the antenna.

[0029] In one possible implementation, the vertical projection of the first conductive structure onto the plane of the second back cover and the second conductive structure are not intersected and are spaced apart. In a three-fold terminal device, the environment inside the cavity results in hinged door panels on both sides of the second back cover. The conductive structures need to be positioned to avoid the door panels. Therefore, the first and second conductive structures are staggered. The combination of the two enhances the effect of counteracting the cavity resonance mode.

[0030] In one possible implementation, the conductive structure includes a first conductive structure and a second conductive structure. The first conductive structure is disposed on the first main body, and the antenna is disposed on the frame of the first main body. The display screen of the terminal device includes a first display portion connected to the first main body. In a folded state, the first display portion is located between the first main body and the second main body. The first conductive structure is located at the edge of the first display portion and is electrically connected to the first reference ground. The second conductive structure is disposed on the side of the second main body facing the first display portion, and the ground terminal of the second conductive structure is connected to the second reference ground. The second conductive structure and the second back cover of the second main body are stacked and cover most of the area of ​​the second back cover. This solution combines the first conductive structure disposed at the edge of the display screen and the second conductive structure inside the second back cover. Through the combination of the two, the effect of canceling the cavity resonance mode can be enhanced.

[0031] In one possible implementation, an insulating medium is provided between the conductive structure and the reference ground, where the reference ground is either the first reference ground or the second reference ground. The insulating medium supports the portion of the conductive structure other than the grounding terminal. The insulating medium supports the conductive structure to prevent bending deformation during use of the terminal device, prevents the portion of the conductive structure other than the grounding terminal from contacting the first reference ground, and electrically isolates the open end of the conductive structure from the first reference ground, preventing electrical crosstalk from the open end to conductive components near the first reference ground and the antenna on the first frame. Attached Figure Description

[0032] Figure 1A A schematic diagram of a terminal device in one embodiment during the transition from a flattened state to a folded state;

[0033] Figure 1B for Figure 1A The diagram shows the terminal device in its folded state.

[0034] Figure 2A A schematic diagram of a terminal device in one embodiment during the transition from a flattened state to a folded state;

[0035] Figure 2B for Figure 2A The diagram shows the terminal device in its folded state.

[0036] Figure 3A A schematic diagram of a terminal device in one embodiment during the transition from a flattened state to a folded state;

[0037] Figure 3B for Figure 3A The diagram shows the terminal device in its folded state.

[0038] Figure 4 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0039] Figure 5a yes Figure 4 A schematic diagram of surface current distribution of a first reference ground with the conductive structure removed from the terminal device shown.

[0040] Figure 5b yes Figure 4 A schematic diagram of surface current distribution of a first reference ground with the conductive structure removed from the terminal device shown.

[0041] Figure 5c yes Figure 4 A schematic diagram of surface current distribution of a first reference ground with the conductive structure removed from the terminal device shown.

[0042] Figure 6 yes Figure 4 The graph shows the relationship between the impedance of the conductive structure and the operating frequency.

[0043] Figure 7 yes Figure 4 The diagram shows the overall system efficiency curves of the cavity resonance mode of the terminal device under certain conditions.

[0044] Figure 8 yes Figure 4 The arrow diagram showing the surface current distribution at a certain moment under one state of the second reference ground of the terminal device is shown.

[0045] Figure 9 yes Figure 4 The arrow diagram shows the surface current distribution at a certain moment in a state where the conductive structure of the second reference ground is removed from the terminal device shown.

[0046] Figure 10 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0047] Figure 11 yes Figure 10 A schematic diagram of the terminal device shown from another perspective;

[0048] Figure 12 yes Figure 11 The diagram shows the relative positions of the first main body, the antenna, and the conductive structure, as well as a schematic diagram of the structure.

[0049] Figure 13 yes Figure 11 The diagram shows an AA cross-sectional view of the terminal device.

[0050] Figure 14 yes Figure 11 The diagram shows a BB cross-sectional view of the terminal device.

[0051] Figure 15 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0052] Figure 16 yes Figure 15 The terminal device shown is a cross-sectional view along line A1-A1.

[0053] Figure 17 yes Figure 11 The diagram shows the overall system efficiency curves of the cavity resonance mode of the terminal device under certain conditions.

[0054] Figure 18a yes Figure 11The surface current distribution of the terminal device at a certain moment on the first reference ground in the cavity resonant mode at a frequency of 0.64 GHz is shown.

[0055] Figure 18b yes Figure 11 The surface current distribution of the terminal device at a certain moment on the first reference ground in the cavity resonant mode at a frequency of 0.92 GHz is shown.

[0056] Figure 18c yes Figure 11 The surface current distribution of the terminal device at a certain moment on the first reference ground in the cavity resonant mode at a frequency of 1.08 GHz is shown.

[0057] Figure 19a This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0058] Figure 19b yes Figure 19a A schematic diagram of the specific arrangement of the conductive structure in the illustrated embodiment;

[0059] Figure 20 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0060] Figure 21 yes Figure 20 A schematic diagram of the terminal device shown from another perspective;

[0061] Figure 22 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0062] Figure 23 yes Figure 22 A schematic diagram of the terminal device shown from another perspective;

[0063] Figure 24 yes Figure 22 The shown is a CC cross-sectional view of the terminal device.

[0064] Figure 25 yes Figure 22 The diagram shows a DD cross-sectional view of the terminal device.

[0065] Figure 26 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0066] Figure 27 yes Figure 26 A schematic diagram of the terminal device shown from another perspective;

[0067] Figure 28 yes Figure 26 The EE cross-sectional view of the terminal device shown;

[0068] Figure 29 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0069] Figure 30 This is a graph showing the overall antenna efficiency of a terminal device provided in one implementation method under certain conditions;

[0070] Figure 31 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0071] Figure 32a One embodiment provides a specific structural solution for setting a conductive structure at the edge of a display screen;

[0072] Figure 32b This is another specific structural solution for setting a conductive structure at the edge of the display screen;

[0073] Figure 33 This is a schematic diagram of the interaction structure between a conductive structure disposed at the edge of a display screen and a first reference ground, provided in one embodiment.

[0074] Figure 34 This is a schematic diagram of the interaction structure between a conductive structure located at the edge of the display screen and a first reference ground, provided by another embodiment.

[0075] Figure 35 This is a schematic diagram of a terminal device provided in another embodiment of this application;

[0076] Figure 36 yes Figure 35 The diagram shows a cross-sectional view of the terminal device.

[0077] Figure 37 yes Figure 31 The diagram shows the overall antenna efficiency curves for certain scenarios of the terminal device.

[0078] Figure 38 This is a schematic diagram of a terminal device provided in one embodiment of this application. Detailed Implementation

[0079] Explanation of some terms

[0080] Foldable devices: refers to devices that can be folded and unfolded, as well as terminal equipment that can maintain a folded or unfolded state.

[0081] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism. It allows for situations where the parallelism is not absolute due to factors such as assembly tolerance, design tolerance, and structural flatness. It also allows for errors within a small angular range, such as within 10 degrees of assembly error. These can all be considered as parallel relationships.

[0082] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0083] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0084] The possible embodiments of this application are described below with reference to the accompanying drawings.

[0085] The terminal device provided in this application is a foldable device. In one embodiment, the terminal device is a smartphone. When folded, the terminal device has a smaller display interface and a smaller overall size, making it easy to carry. When unfolded, the terminal device has a larger display interface.

[0086] Figure 1A This is a schematic diagram of a terminal device in one embodiment during the transition from a flattened state to a folded state. Figure 1B for Figure 1A The diagram shows the terminal device in its folded state. Figure 2A This is a schematic diagram of a terminal device in one embodiment during the transition from a flattened state to a folded state. Figure 2B for Figure 2A The diagram shows the terminal device in its folded state. Figure 1A , Figure 1B , Figure 2A and Figure 2B As shown in the specific embodiments of this application, the terminal device provided can be a folding device.

[0087] In one implementation, such as Figure 1A , Figure 1BAs shown, the terminal device 100 has an inwardly folded display screen structure. During the relative folding of the first main body 1 and the second main body 2, the display screen 8 is located inside the folding direction of the main body 10. The display screen 8 includes a first display portion 81, a second display portion 82, and a first bending portion 84. During the relative folding of the first main body 1 and the second main body 2, the first display portion 81 and the second display portion 82 fold relative to each other, and the first bending portion 84 undergoes bending deformation. Figure 1B In the illustration shown, in the folded state, the display screen 8 is located between the first main body 1 and the second main body 2, and is obscured by the main body 10, making it invisible.

[0088] In one implementation, such as Figure 2A and Figure 2B As shown, the terminal device 100 has an outward-folding display screen structure. During the relative folding of the first main body 1 and the second main body 2, the display screen 8 is located on the outside of the folding direction of the main body 10. The display screen 8 includes a first display portion 81, a second display portion 82, and a first bending portion 84. In the folded state, the first main body 1 and the second main body 2 are stacked, the first bending portion 84 undergoes bending deformation, and the display screen 8 covers the periphery of the main body 10.

[0089] Figure 3A This is a schematic diagram of a terminal device in one embodiment during the transition from a flattened state to a folded state. Figure 3B for Figure 3A The diagram shows the terminal device in a folded state. In one embodiment, as shown... Figure 3A , Figure 3BAs shown, the terminal device 100 can be a three-fold device. The terminal device 100 includes a main body 10 and a display screen 8. The main body 10 includes a first main body 1, a second main body 2, a first rotating shaft 3A, a second rotating shaft 3B, and a third main body 7. The first rotating shaft 3A connects the first main body 1 and the second main body 2, and the second rotating shaft 3B connects the third main body 7 and the second main body 2. The display screen 8 includes a first display portion 81, a second display portion 82, a third display portion 83, a first bending portion 84, and a second bending portion 85. The first bending portion 84 connects the first display portion 81 and the second display portion 82, and the second bending portion 85 connects the third display portion 83 and the second display portion 82. The first display portion 81 is connected to the first main body 1, the second display portion 82 is connected to the second main body 2, and the third display portion 83 is connected to the third main body 7. During the relative folding process of the third main body 7 and the second main body 2, the second display portion 82 and the third display portion 83 are equivalent to an outward folding scheme, that is, the second display portion 82 and the third display portion 83 are located on the outside of the folding direction. During the relative folding of the second main body 2 and the first main body 1, the first display portion 81 and the second display portion 82 are equivalent to an inward folding scheme, that is, the first display portion 81 and the second display portion 82 are located on the inside in the folding direction. In the folded state, both the main body 10 and the display screen 8 are folded into a three-fold structure, with the first main body 1, the second main body 2, and the third main body 7 stacked on top of each other. In the folded state, the second display portion 82 and the first display portion 81 are sandwiched and hidden between the second main body 2 and the first main body 1, and the third display portion 83 is located on the outer surface of the main body 10. The third display portion 83 can be used to display the interface in the folded state.

[0090] Figure 3A and Figure 3B The illustrated embodiment is an S-shaped folding three-fold device. An S-shaped folding three-fold device can be understood as having a second main body 2 stacked between the first main body 1 and the third main body 7 in the folded state. In other embodiments, the terminal device can also be a G-shaped folding three-fold device. A G-shaped folding three-fold device can be understood as having the first and second main bodies folded into a large U-shaped structure, with the third main body folded (or stacked) between the first and second main bodies.

[0091] The terminal device provided in this application may be, but is not limited to, the following: Figures 1A to 3BThe described terminal device has an antenna radiator mounted on a frame. In a folded state, a cavity is formed between the folded main bodies. Specifically, the cavity is an insulating space between the folded main bodies and may contain insulating structural components, such as an insulating back cover of the terminal device. The cavity may also include gaps and other insulating media (e.g., foam). When the antenna radiator is excited, a current is excited on the reference ground corresponding to the cavity, generating a cavity resonance mode. The cavity resonance mode includes multiple modes, with different currents excited on the reference ground under different modes. One mode's resonance point falls within the antenna's operating frequency band, affecting the antenna's radiation efficiency. This application mainly designs cavity resonance modes whose resonance points fall within the antenna's operating frequency band, tuning their resonance points to outside the antenna's operating frequency band to reduce the impact of the cavity resonance mode on the antenna's radiation efficiency.

[0092] This application addresses the issue of cavity resonant modes affecting the antenna by incorporating a conductive structure within a cavity. This conductive structure is related to the cavity's resonant frequency and is used to tune the cavity's resonance to outside the antenna's operating frequency band. The terminal device's antenna operates in a first frequency band. When the antenna is in operation, the cavity with the conductive structure is excited to generate a first resonant mode. When the conductive structure is not present within the cavity, the cavity is excited by the antenna to generate a second resonant mode. In the excited state, a first or second reference ground includes a current distributed along a first direction. The side length of the first or second reference ground along the first direction is half the wavelength corresponding to a frequency within the antenna's operating frequency band. The frequencies within the antenna's operating frequency band include a minimum frequency and a maximum frequency. The side length of the first or second reference ground along the first direction is between half the electrical length of the wavelength corresponding to the minimum frequency and half the electrical length of the wavelength corresponding to the maximum frequency. The resonant point of the cavity in the second resonant mode is located within the first frequency band, which affects the antenna's radiation efficiency. This application provides a conductive structure within the cavity, such that the resonant point of the cavity in the first resonant mode generated by the cavity being excited is located outside the first frequency band.

[0093] Figure 4 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. (See attached diagram.) Figure 4 The terminal device 100 is a foldable mobile terminal with two main bodies and a hinge. The main body 10 includes a first main body 1 and a second main body 2 that can be folded and flattened relative to each other, and the first main body 1 and the second main body 2 are connected by a hinge 3. Figure 4The terminal device's display screen is not shown in the illustrated embodiment. In one embodiment, the display screen can be located around the periphery of the main body in the folded state. The main body 10 may include the terminal device's mid-frame, electronic components, batteries, circuit boards, antennas, etc., mounted on the mid-frame, and a back cover. The mid-frame of the terminal device is made of a metal material, such as aluminum alloy. The first main body 1 includes a first reference ground 11. In one embodiment, the first reference ground 11 may be the mid-frame of the first main body 1, the metal casing of electronic components within the first main body 1, or the grounding layer of the circuit board, etc. In one embodiment, the first reference ground 11 is a metal sheet or metal film structure connected to the mid-frame of the first main body 1. For example, after the functional structures such as electronic components, circuit boards, batteries, and antennas in the first main body 1 are assembled to the mid-frame, a metal sheet or metal film structure is covered on the surface of these functional structures. The second main body 2 includes a second reference ground 21. Similarly, the second reference ground 21 may be the mid-frame of the second main body 2, the metal casing of electronic components within the second main body 2, or the grounding layer of the circuit board, etc. In one embodiment, the second reference ground 21 is a metal sheet or metal film structure connected to the middle frame of the second body 2. For example, after the various electronic devices, circuit boards, batteries, antennas and other functional structures in the second body 2 are assembled to the middle frame, a metal sheet or metal film structure is covered on the surface of these functional structures.

[0094] See Figure 4 With the first main body 1 and the second main body 2 folded relative to each other, the first reference ground 11 and the second reference ground 21 are stacked and a cavity 20 is formed between them. The cavity 20 refers to the area between the reference grounds of the two main bodies. The cavity 20 may contain insulating structural components. Figure 4 (The structural components inside the cavity are not shown.) The insulating structural components can be the back cover of the first main body 1 and the back cover of the second main body 2. The cavity 20 can also include an insulating medium, such as air or foam. The terminal device 100 also includes an antenna 4 and a conductive structure 5. The antenna 4 is disposed on the frame 30 of the main body 10 and located at the edge of the cavity 20. The antenna 4 can be disposed on the frame of the first main body 1 and / or the frame of the second main body 2. The antenna 4 and the rotating shaft 3 are both located at the edge of the cavity 20. In one embodiment, the extension direction of the frame 30 where the antenna 4 is located is a first direction. The first direction is the long side direction of the terminal device 100 in the folded state. In the state where the first main body 1 and the second main body 2 are folded relative to each other, the conductive structure 5 is located inside the cavity 20. In one embodiment, the conductive structure 5 includes a grounding end 52 and an open end 51, which are spaced apart along the first direction.

[0095] See Figure 4In one embodiment, antenna 4 is disposed on the first frame 12 of the first main body 1, and the grounding terminal of antenna 4 is electrically connected to the first reference ground 11. Conductive structure 5 is disposed within the second main body 2, and the grounding terminal 52 of conductive structure 5 is connected to the second reference ground 21. In the folded state, conductive structure 5 is located within cavity 20. When antenna 4 is in operation, it can excite a current on the first reference ground 11, generating a cavity resonance mode due to the presence of cavity 20. If the frequency of the cavity resonance mode falls within the operating frequency band of the antenna, it will affect the radiation efficiency of the antenna. This solution, by providing conductive structure 5, can suppress the current generated by antenna 4 excitation on the second reference ground 21. By suppressing the current distribution on the second reference ground 21, the frequency of the cavity resonance mode can be adjusted to outside the operating frequency band of antenna 4, reducing the impact of the cavity resonance mode on the radiation efficiency of antenna 4 and improving the radiation efficiency of antenna 4. For example, this solution can suppress the half-length mode along the longitudinal direction generated by cavity 20 resonance.

[0096] The radiator of the antenna is arranged along the long side of the main body in the folded state. The length of the long side of the main body in the folded state is half the wavelength corresponding to the frequency in the antenna's operating frequency band. The formula for calculating the wavelength is:

[0097]

[0098] Where λ represents wavelength, C represents speed of light, f represents frequency in Hz, and ε r Represents the relative permittivity of the medium.

[0099] The speed of light is a constant, approximately 3 × 10^8 m / s. For example, when f = 0.85G, ε r When λ = 2.98, λ = 204 mm, and the length of the half-mode is 102 mm.

[0100] Figure 4In the embodiment shown, when the terminal device 100 is in a flattened state, the first main body 1 and the second main body 2 are relatively flattened. At this time, the antenna 4, in its working state, does not generate a cavity resonance mode due to the absence of a cavity environment, resulting in better radiation efficiency. Furthermore, since the conductive structure 5 is disposed within the second main body 2, and the conductive structure 5 and the antenna 4 are not located within the same main body, the position of the conductive structure 5 is more flexible. For example, the position of the grounding terminal 52 of the conductive structure 5 can differ from that of the grounding terminal of the antenna 4, because the grounding terminal 52 of the conductive structure 5 and the grounding terminal of the antenna 4 are not connected to the same reference ground. The position of the conductive structure 5 on the frame can also be staggered from that of the antenna 4 on the frame. The conductive structure 5 can be configured according to the requirements of the internal environment of the terminal device, providing greater flexibility. On the other hand, because the conductive structure 5 is far from the antenna 4, the conductive structure 5 does not affect the radiation efficiency of the antenna 4. Therefore, Figure 4 In the embodiment shown, by placing the conductive structure 5 and the antenna 4 in different bodies, the conductive structure 5 can solve the problem of antenna efficiency reduction caused by cavity resonance mode in the folded state, and the radiation efficiency of the antenna 4 will not be affected by the placement of the conductive structure 5 in the flattened state.

[0101] See Figure 4 In one embodiment, the edge of the first body 1 includes a first short side 13 and a first long side 14. The first short side 13 is connected between one end of the rotating shaft 3 and the first long side 14. The edge of the second body 2 includes a second short side 23 and a second long side 24. The second short side 23 is connected between one end of the rotating shaft 3 and the second long side 24. Both the first long side 14 and the second long side 24 are arranged opposite to the rotating shaft 3, and their extension directions are both in a first direction. The first short side 13, the first long side 14, the second short side 23, and the second long side 24 are all located at the edge of the cavity 20. When the antenna 4 is disposed on the first body 1, the grounding terminal 52 of the conductive structure 5 is electrically connected to the second reference ground 21, which allows for more flexible arrangement of the relative position between the conductive structure 5 and the radiator of the antenna 4. For example, the antenna 4 can be disposed on the first long side 14 of the first body 1, in which case the extension direction of the conductive structure 5 is parallel to the extension direction of the radiator of the antenna 4. In other embodiments, the antenna 4 can also be disposed on the first short side 13 of the first body 1, in which case the extension direction of the conductive structure 5 is perpendicular to the extension direction of the radiator of the antenna 4.

[0102] Figure 5a yes Figure 4 A schematic diagram of surface current distribution of the first reference ground 11 with the conductive structure 5 removed from the terminal device 100 shown. Figure 5b yes Figure 4 A schematic diagram of surface current distribution of the first reference ground 11 with the conductive structure 5 removed from the terminal device 100 shown. Figure 5c yes Figure 4A schematic diagram of surface current distribution of the first reference ground 11 with the conductive structure 5 removed from the terminal device 100 shown. Figure 5a , Figure 5b and Figure 5c Taking the first reference ground as an example, the current distribution on the first reference ground in cavity mode is explained. The current distribution on the second reference ground is similar and will not be described again.

[0103] Combination Figure 4 , Figure 5a , Figure 5b as well as Figure 5c As shown, in the folded state, the presence of cavity 20 causes current distribution on the first reference ground 11 and the second reference ground 21. This current distribution includes long-side current (e.g., current propagating along the first long side 14, also called longitudinal current) and short-side current (e.g., current propagating along the first short side 13, also called transverse current). Cavity resonant modes include long-side modes and short-side modes. In the short-side mode, one end of the reference ground is open-circuited and the other end is short-circuited; in the long-side mode, both ends of the reference ground are open-circuited. The short-side mode can be understood as a quarter-wavelength multiple of the cavity resonance, and the long-side mode can be understood as half-wavelength of the cavity resonance. The current distribution modes corresponding to the cavity resonant modes mainly include... Figure 5a , Figure 5b as well as Figure 5c The three scenarios shown Figure 5a In the first mode shown, there is mainly a transverse current on the first reference ground 11 that is transmitted along the direction of the first short side 13. Figure 5b In the second mode shown, there are simultaneously transverse currents propagating along the first short side 13 and longitudinal currents propagating along the first long side 14 on the first reference ground 11, and the distributions of the transverse currents and longitudinal currents are comparable. Figure 5c In the illustrated mode three, both lateral currents propagating along the first short side 13 and longitudinal currents propagating along the first long side 14 exist simultaneously on the first reference ground 11. Compared to mode two, the lateral current in mode three is larger, indicating that the short-side mode dominates in mode three. For the antenna 4 mounted on the first long side 14, the long-side mode of cavity resonance has a significant impact on the radiation efficiency of the antenna 4. Therefore, mode two, where the short-side mode and the long-side mode coexist and each accounts for a considerable proportion, usually has the greatest impact on the radiation efficiency of the antenna 4. In this embodiment, by setting the extension direction of the conductive structure 5 to be parallel to the direction of the current propagating on the long side, the conductive structure 5, which is connected in series with the first reference ground 11 or the second reference ground 21, can suppress the longitudinal current on the corresponding reference ground, reduce the negative impact of the resonant mode of the cavity 20 on the operating frequency band of the antenna 4, and improve the radiation efficiency of the antenna 4.

[0104] In one embodiment, the length of the conductive structure 5 extending along the first direction is one-quarter of the wavelength corresponding to the frequency within the antenna's operating frequency band. This can be understood as follows: the frequencies within the antenna's operating frequency band include the lowest and highest frequencies, and the electrical length of the conductive structure 5 extending along the first direction is between one-quarter of the electrical length corresponding to the lowest frequency and one-quarter of the electrical length corresponding to the highest frequency. For the conductive structure 5, this is equivalent to a series loading on the reference ground (first reference ground 11 or second reference ground 21). When the electrical length of the conductive structure 5 along the first direction is close to 1 / 4 wavelength, its open end is in a high-impedance state; when the frequency is less than the resonant point, it is equivalent to an inductor; when the frequency is greater than the resonant point, it is equivalent to a capacitor. This solution, by constraining the length of the conductive structure 5 along the first direction, helps ensure that when the antenna operates near the resonant point frequency, the open end 51 of the conductive structure 5 is in a high-impedance state. This helps suppress the current of the first or second main body, effectively reducing the influence of the cavity's resonant mode within the antenna's operating frequency band and improving the antenna's radiation efficiency.

[0105] Figure 6 yes Figure 4 The impedance of the conductive structure 5 in the illustrated embodiment is a graph showing the relationship between the impedance and the operating frequency. Figure 6 The Z1 curve shown represents the change of the real part of the impedance of conductive structure 5 with frequency (the operating frequency of conductive structure 5). Figure 6 The Z2 curve shown represents the imaginary part of the impedance of the conductive structure 5 as a function of frequency. When the electrical length of the conductive structure 5 is close to one-quarter wavelength of its operating frequency (the resonant frequency generated by the cavity mode), the open end 51 of the conductive structure 5 is in a high-impedance state. For example, as shown by the Z1 curve, the impedance of the open end 51 of the conductive structure 5 can be greater than 800Ω. For example, if the operating frequency of the conductive structure 5 (the resonant frequency generated by the cavity mode) is 0.90649GHz, the conductive structure 5 is equivalent to a capacitor when its resonant frequency is higher than 0.90649GHz. When its resonant frequency is lower than 0.90649GHz, the conductive structure 5 is equivalent to an inductor. Based on the above principle, by setting the conductive structure 5 in the cavity 20, the resonance generated by the cavity 20 can be adjusted by capacitive or inductive loading, for example, adjusting the resonance generated by the cavity 20 to outside the operating frequency band of the antenna 4. Therefore, by setting a conductive structure 5 inside the cavity 20, this solution can tune the cavity resonance mode generated by the cavity 20 when the antenna 4 is working, reduce the influence of the cavity 20 resonance mode in the working frequency band of the antenna 4, and improve the radiation efficiency of the antenna 4.

[0106] Figure 7 yes Figure 4The diagram shows the overall system efficiency curves of the cavity resonant mode of the terminal device 100 under certain conditions. In one embodiment, the antenna is a low-frequency antenna, for example, the antenna can cover three frequency bands: B28, B5, and B8, for example, the operating frequency band of the antenna is 0.7 GHz to 0.96 GHz. Figure 7 The A1 curve in the middle represents Figure 4 The system overall efficiency curve of the cavity resonant mode of the terminal device 100 shown below, without the conductive structure 5, is as follows: Figure 7 As shown in curve A1, in the terminal device 100 without conductive structure 5, the cavity resonance mode generated by the antenna in the working state is at a frequency of 0.88 GHz. The cavity resonance mode is a half-wavelength mode along the first direction. The frequency range of the cavity resonance is within the working frequency range of the antenna, which will affect the radiation efficiency of the antenna. Figure 7 The B1 curve in the middle represents Figure 4 The system overall efficiency curve of the cavity resonant mode is shown in the terminal device 100 with the conductive structure 5 removed and the cavity 20 blocked. "Cavity 20 blocked" means that the cavity portion between the first reference ground and the second reference ground is replaced with metal, so that there is no insulating lossy medium between the first and second reference grounds. In other words, the influence of the cavity resonant mode on the antenna radiation efficiency is eliminated by blocking the cavity. Figure 7 As shown by curve B1, in the absence of cavity resonance mode, there is no cavity resonance effect within the operating frequency band of the antenna. Figure 7 The C1 curve in the middle represents Figure 4 The system overall efficiency curve of the cavity resonance mode of the terminal device 100 shown is as follows: Figure 7 As shown in the C1 curve, by setting the conductive structure 5, for example, by connecting the conductive structure 5 in series with the second reference ground 21, it is equivalent to adding a series capacitor to the second reference ground 21. The cavity resonance mode shifts to a higher frequency, and the cavity resonance peaks around 1.05 GHz. Therefore, the frequency of the cavity resonance mode is outside the operating frequency band (0.7 GHz - 0.96 GHz) of the antenna. Thus, the influence of the cavity resonance mode on the radiation efficiency of the antenna 4 can be reduced.

[0107] Figure 8 yes Figure 4 The diagram shows the surface current distribution arrows at a certain moment under one state of the second reference ground 21 of the terminal device 100. (See attached diagram.) Figure 8 and Figure 4 By providing a conductive structure 5 inside the cavity 20, the distribution of surface current in the second reference ground 21 can be affected. Figure 8 The arrows in the diagram schematically represent the current distribution at a given moment. Figure 9 yes Figure 4The arrow diagram shows the surface current distribution at a certain moment in a state where the conductive structure 5 of the second reference ground 21 is removed from the terminal device 100 shown. Figure 8 and Figure 9 The scale for displaying current is the same.

[0108] contrast Figure 8 and Figure 9 It can be seen that by setting the conductive structure 5 inside the cavity 20, the distribution of the surface current of the second reference ground 21 can be affected, and the distribution of the surface current of the second reference ground 21 can be reduced (compared to...). Figure 9 , Figure 8 The size and number of arrows in the cavity decrease, and the arrow distribution becomes sparse, which suppresses the cavity resonance mode.

[0109] Figure 10 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. Figure 11 yes Figure 10 The schematic diagram of the terminal device 100 shown is from another perspective, combined with Figure 10 and Figure 11 As shown, in one embodiment, the terminal device 100 is a foldable mobile terminal. The antenna 4 and conductive structure 5 are both disposed on the first main body 1. The antenna 4 is disposed on the first frame 12 located on the first long side 14. The antenna 4 includes a radiator 41, the extension direction of which is parallel to the extension direction of the conductive structure 5 and is the same as the extension direction of the first long side 14. The extension of the conductive structure 5 can be understood as the direction in which the grounding end 52 and the open end 51 of the conductive structure 5 are arranged. The grounding end 52 is electrically connected to the first position 1111 of the first reference ground 11. The radiator 41 includes a third grounding end 411, which is connected to the first position 1111. That is, the grounding end of the conductive structure 5 and the grounding end of the antenna 4 are connected to the same position of the first reference ground 11. Since the antenna 4 will excite a current on the first reference ground 11 when it is in operation, the current on the radiator 41 and the current on the first reference ground 11 form a loop. The grounding terminal 52 of the conductive structure 5 is electrically connected to the first reference ground 11. In the folded state, the conductive structure 5 has the effect of suppressing the current on the first reference ground 11. This scheme connects the grounding terminal of the conductive structure 5 and the grounding terminal of the antenna 4 to the same position of the first reference ground 11, so that the connection between the conductive structure 5 and the first reference ground 11 will not affect the current distribution on the radiator 41, thus ensuring the radiation efficiency of the antenna.

[0110] Figure 12 yes Figure 11 The diagram shows the relative positions and structures of the first main body 1, antenna 4, and conductive structure 5. Figure 13 yes Figure 11 The terminal device 100 shown is a cross-sectional view (AA). Figure 14 yes Figure 11 The BB cross-sectional view of the terminal device 100 shown, combined with Figure 12 , Figure 13 and Figure 14 As shown, in one embodiment, the open end 51 is spaced apart from the first reference ground 11, and the open end 51 of the conductive structure 5 is a suspended structure. In one embodiment, the radiator 41 includes two branches separated by an insulating gap 42, both of which extend along the direction of the frame of the terminal device, and the insulating gap 42 is located at the open end of the radiator 41. In one embodiment, the open end 51 of the conductive structure 5 is adjacent to the open end of the radiator 41 of the antenna 4.

[0111] See Figure 12 In one embodiment, the conductive structure 5 may include a conductive body 5A and a groove 5C provided on the conductive body 5A. By setting the groove 5C, the electrical length of the conductive structure 5 can be changed, or the current distribution on the conductive structure 5 and the first reference ground 11 can be changed, thereby adjusting the resonant position. Figure 12 The diagram schematically illustrates the structure and location of a slot. This application does not limit the specific shape of the slot, and the location of the slot can be set according to requirements. In one embodiment, the distance between the slot 5C and the open end 51 is smaller than the distance between the slot 5C and the ground end 52, that is, the slot 5C is closer to the open end 51. A tuning device 5D, such as a capacitive device, an inductive device, or other types of lumped device, can also be set at the location of the slot 5C. By loading the tuning device 5D, the electrical length of the conductive structure 5 can be adjusted. The arrangement of the slot 5C and the tuning device 5D is beneficial for improving the physical length of the conductive structure 5 more efficiently in a space-constrained environment. Therefore, this solution can tune the cavity resonance mode generated by the cavity 20 when the antenna 4 is working by the conductive structure 5, reduce the resonance of the cavity 20 to be outside the operating frequency band of the antenna 4, and reduce the impact of the cavity resonance mode on the radiation efficiency of the antenna 4.

[0112] In one embodiment, the number of conductive structures 5 is one (e.g., Figure 12 , Figure 14 and Figure 15 As shown), and is disposed on one side of the insulating gap 42 on the radiator 41 of the antenna 4. In other embodiments, two conductive structures 5 may also be provided (such as...). Figure 13 As shown in the diagram, two conductive structures 5 are respectively disposed on both sides of the insulating gap 42 on the radiator 41 of the antenna 4. These two conductive structures 5 can be symmetrically or asymmetrically disposed. For example, the structural form of one of the conductive structures 5 can be adjusted according to specific requirements. Distributing a conductive structure 5 on each side of the insulating gap 42 is beneficial to widening the bandwidth of the high impedance, thereby better suppressing cavity modes.

[0113] Figure 15This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. Figure 16 yes Figure 15 The terminal device 100 shown in the A1-A1 sectional view, combined with... Figure 15 and Figure 16 As shown, in one embodiment, an insulating medium 55 may be filled between the open end 51 and the first reference ground 11. The insulating medium 55 contacts the side of the open end 51 facing the first reference ground 11 and the side of the first reference ground 11 facing the open end 51. The insulating medium 55 is used to support the conductive structure 5 to prevent the conductive structure 5 from bending and deforming during the use of the terminal device 100. It can prevent parts of the conductive structure 5 other than the grounding end 52 from contacting the first reference ground 11. The insulating medium 55 can electrically isolate the open end 51 of the conductive structure 5 and the first reference ground 11, avoiding electrical crosstalk between the open end 51 and the conductive components near the first reference ground 11 and the antenna 4 on the first frame 12.

[0114] Figure 17 yes Figure 11 The diagram shows the overall system efficiency curves of the cavity resonant mode of the terminal device 100 under certain conditions. In one embodiment, the antenna is a low-frequency antenna, for example, the antenna can cover three frequency bands: B28, B5, and B8, for example, the operating frequency band of the antenna is 0.7 GHz to 0.96 GHz. Figure 17 The A2 curve in the image represents Figure 11 The system overall efficiency curve of the cavity resonant mode of the terminal device 100 shown is obtained by removing the conductive structure 5. Figure 17 As shown in curve A2, in the terminal device 100 without conductive structure 5, the cavity resonance mode generated by the antenna in the working state is at a frequency of 0.88 GHz. The cavity resonance mode is a half-wavelength mode along the first direction. The frequency range of the cavity resonance is within the working frequency range of the antenna, which will affect the radiation efficiency of the antenna. Figure 17 The B2 curve in the middle represents Figure 11 The system overall efficiency curve of the cavity resonance mode is shown in the terminal device 100 with the conductive structure 5 removed and the cavity blocked. Figure 17 As shown by curve B2, in the absence of cavity resonance mode, there is no cavity resonance effect within the antenna's operating frequency band. Figure 17 The C2 curve in the middle represents Figure 11 The system overall efficiency curve for the cavity resonant mode of antenna 4 of terminal device 100 is shown. Point P1 is... Figure 11 The total efficiency of the terminal device 100 in the first resonant state (0.64 GHz operating frequency) of the cavity resonant mode; point P2 is... Figure 11The total efficiency of the terminal device 100 in the second resonant state (0.92GHz operating frequency) of the cavity resonant mode; point P3 is... Figure 11 The overall efficiency of the cavity resonant mode of the terminal device 100 shown at an operating frequency of 1.08 GHz. For example... Figure 17 As shown in curve C2, by setting the conductive structure 5, the cavity resonance mode generates a first resonance state and a second resonance state. In the first resonance state, the cavity resonance peaks near 0.65 GHz. In the second resonance state, the cavity resonance peaks near 1.06 GHz-1.08 GHz. The frequencies of the cavity resonance in both resonance states are outside the antenna's operating frequency band (0.7 GHz-0.96 GHz), thus reducing the impact of the cavity resonance mode on the radiation efficiency of antenna 4.

[0115] Figure 18a yes Figure 11 The diagram shows the surface current distribution on the first reference ground 11 at a certain moment in the cavity resonant mode of the terminal device at a frequency of 0.64 GHz. Figure 18b yes Figure 11 The diagram shows the surface current distribution on the first reference ground 11 at a certain moment in the cavity resonant mode of the terminal device at a frequency of 0.92 GHz. Figure 18c yes Figure 11 The diagram shows the surface current distribution on the first reference ground 11 at a certain moment in the cavity resonant mode of the terminal device at a frequency of 1.08 GHz.

[0116] contrast Figure 18a , Figure 18b and Figure 18c The cavity resonant mode of the terminal device produces a resonant state at a frequency of 0.64 GHz and a resonant state at a frequency of 1.08 GHz. In both resonant states, the current distribution on the first reference ground 11 is stronger, corresponding to... Figure 18a and Figure 18c The arrows representing current are densely distributed, but the frequencies corresponding to these two resonant states are outside the antenna's operating frequency band. In the cavity resonant mode of the terminal device at 0.92 GHz, the current distribution on the first reference ground 11 is significantly weaker (compared to...). Figure 18a and Figure 18c , Figure 18b The size and number of arrows representing current decrease, and the arrow distribution becomes sparse; and as shown by the black arrow pointing to the column of current values ​​on the right surface. Figure 18b The surface current value corresponding to the first reference ground 11 is much smaller than Figure 18a and Figure 18b(The surface current value corresponding to the first reference ground 11). Therefore, by setting a conductive structure, the resonant frequency of the cavity resonant mode is raised or lowered, and it is located outside the antenna's operating frequency band. The cavity resonant mode has little impact on the antenna's radiation efficiency.

[0117] Figure 19a This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. (See attached diagram.) Figure 19a In one embodiment, the terminal device 100 is a tri-fold device, having three main bodies: a first main body 1, a second main body 2, and a third main body 7. The terminal device has two pivots 3. In the folded state, the second main body 2 is stacked between the first main body 1 and the third main body 7. The radiator 41 of the antenna 4 is disposed on the first frame 12 of the first main body 1. In the folded state, a cavity 20 is formed between the first reference ground 11 of the first main body 1 and the second reference ground 21 of the second main body 2. A conductive structure 5 is disposed on the second main body 2; specifically, the conductive structure 5 may be disposed on the back cover of the second main body 2. Figure 19a The inner surface of the back cover (not shown) of the second main body is made of insulating material. The conductive structure 5 can be a conductive film or conductive sheet attached to the inner surface of the back cover. The grounding terminal 52 of the conductive structure 5 is electrically connected to the second reference ground 21. The grounding terminal 52 can be electrically connected to the second reference ground 21 through a grounding spring. Figure 19a In the illustrated embodiment, there are two conductive structures 5, arranged along the extending direction of the first frame 12. In one embodiment, these two conductive structures 5 can be symmetrically arranged on both sides of the insulating gap 42 on the radiator of the antenna 4, which can widen the bandwidth of the high impedance, thereby better suppressing cavity modes.

[0118] See Figure 19aIn one embodiment, the open end 51 and ground end 52 of the conductive structure 5 can be arranged along the direction of the second long side 24, i.e., the first direction. The second body 2 includes a second frame 22, the extension direction of the second frame 22 is perpendicular to the extension direction of the rotating shaft 3, and the second frame 22 is located on the second short side 23 of the second body 2. The conductive structure 5 includes a first ground end 521 and a second ground end 522, the first ground end 521 and the second ground end 522 are respectively located on the second reference ground 21 near the opposite ends of the second frame 22, and the width of the conductive structure 5 is equal to the distance between the first ground end 521 and the second ground end 522. In one embodiment, the width of the conductive structure 5 can be greater than three-quarters of the length of the second short side 23. In this embodiment, the ground end 52 of the conductive structure 5 is electrically connected to the second reference ground 21, the antenna 4 is located on the first frame 12 of the first body 1, the conductive structure 5 and the antenna 4 are respectively located on the second body 2 and the first body 1, and the position of the ground end 52 of the conductive structure 5 will not affect the current distribution on the first reference ground 11 to which the ground end of the antenna 4 is connected. The grounding terminal 52 of the conductive structure 5 can be arranged more flexibly, without being constrained by the position of the grounding terminal of the antenna 4.

[0119] Figure 19b yes Figure 19a A schematic diagram of the specific arrangement of the conductive structure in the illustrated embodiment. Figure 19b The diagram schematically illustrates the positional relationship between the back cover 25, the conductive structure 5, and the second reference ground 21 of the second main body 2, and shows the positional correspondence between the radiator 41 of the antenna located on the first main body and the second main body. (See also...) Figure 19a and Figure 19b In one embodiment, when the terminal device is in a flattened state, the first main body 1, the third main body 7, and the second main body 2 are arranged sequentially on a plane. When the terminal device is in a folded state, the display screen is located inside the main body; for example, the display screen corresponding to the first main body 1 is located on the side of the first main body 1 facing the second main body 2, the display screen corresponding to the third main body 7 is located on the side of the third main body 7 facing the second main body 2, and the display screen corresponding to the second main body 2 is located on the side of the second main body 2 facing the third main body 7. In one embodiment, Figure 19a The first reference ground 11 in the terminal device shown can be a reference ground that is close to the second main body 2 in the folded state, such as the mid-frame or the metal layer on the back of the display screen. The conductive structure 5 is disposed on the back cover 25 of the second main body 2. For example, the conductive structure 5 is attached to the inner surface of the back cover 25, or the conductive structure 5 is a conductive layer or conductive film structure coated or electroplated on the inner surface of the back cover 25. In other embodiments, the conductive structure 5 can also be integrated inside the back cover 25, for example, the conductive structure 5 is located in the middle of the thickness direction of the back cover 25. The area of ​​the conductive structure 5 can be the same as the area of ​​the back cover 25. Figure 19bThe left side of the diagram shows the pivot shaft connected to the second main body 2, and the left side of the back cover 25 is the door panel of the pivot shaft area. In one embodiment, the conductive structure 5 is positioned to avoid the door panel, meaning that no conductive structure is provided in the door panel area. In the folded state, the radiator 41 of the antenna on the first main body 1 has its vertical projection on the second main body 2 offset from the back cover and is located on the door panel.

[0120] Figure 20 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. (See attached diagram.) Figure 20 In one embodiment, the terminal device 100 is a foldable mobile terminal, comprising a first main body 1, a second main body 2, and a hinge 3. The radiator 41 of the antenna 4 is disposed on the first frame 12 of the first main body 1. A conductive structure 5 is disposed on the first main body 1. In the folded state, the display screen 8 is located around the first main body 1 and the second main body 2, surrounding the first main body 1, the second main body 2, and the hinge 3. The back cover of the first main body 1 and the back cover of the second main body 2 are both made of insulating material, and they are stacked and close together. Figure 20 The back cover is not shown. A cavity 20 is formed between the first reference ground 11 of the first body 1 and the second reference ground 21 of the second body 2. In this embodiment, the first reference ground 11 can be a metal layer disposed on the middle frame of the first body 1, and the second reference ground 21 can be a metal layer disposed on the middle frame of the second body 2.

[0121] See Figure 20 In one embodiment, the first main body 1 includes a middle frame 15, the middle frame 15 has a battery compartment 151, and the middle frame 15 includes a battery compartment retainer 152. A portion of the first reference ground 11 can be located on the battery compartment retainer 152. The battery compartment retainer 152, the frame 30 where the antenna 4 is located (i.e., the first frame 12), and a portion of the edge area of ​​the display screen 8 of the terminal device 100 together form a receiving cavity 6. The conductive structure 5 is located within the receiving cavity 6. The receiving cavity 6 is an unused space between the battery compartment retainer 152 and the first frame 12. This space is narrow and cannot accommodate other components of the terminal device. This solution utilizes the receiving cavity 6 to place the conductive structure 5. On the one hand, this allows the conductive structure 5 to be closer to the radiator 41 of the antenna 4. On the other hand, it utilizes the unused space of the receiving cavity 6, without requiring additional space in the thickness of the terminal device, which is beneficial for the design of a thinner terminal device. The conductive structure 5 located in the receiving cavity 6 is elongated and narrow. The dimension of the conductive structure 5 along the first short side 13 is relatively small compared to the length of the antenna 4. Figure 11 The conductive structure 5 shown is small, and the distance between the conductive structure 5 and the radiator 41 of the antenna 4 is smaller than that of the radiator 41 of the antenna 4. Figure 11The conductive structure 5 shown is close to the radiator 41. The middle frame 15 can be at least part of the first reference ground 11, and the ground terminal 52 of the conductive structure 5 is connected to the middle frame 15. By placing the conductive structure 5 inside the receiving cavity 6 and grounding the conductive structure 5 to the middle frame 15, the surface current of the first reference ground 11 during antenna 4 operation can be suppressed, the resonant mode generated by the cavity 20 during antenna 4 operation can be tuned, and the overall efficiency of antenna 4 can be improved.

[0122] See Figure 20 In one embodiment, the terminal device 100 may further include a tuning structure 9, located at the open end 51 of the conductive structure 5, and electrically connected to a first reference ground 11. The tuning structure 9 can be used to adjust the electrical length of the conductive structure 5, so that the conductive structure 5 better tunes the resonant mode generated by the cavity 20 when the antenna 4 is working, reduces the influence of the resonant mode of the cavity 20 in the operating frequency band of the antenna 4, and improves the radiation efficiency of the antenna 4.

[0123] See Figure 20 In one embodiment, the tuning structure 9 includes a circuit board 92 and a tuning device 91 disposed on the circuit board 92. The tuning device 91 is located at the open end 51 of the conductive structure 5 and is electrically connected to the conductive structure 5. The circuit board 92 is connected to a first reference ground 11, and the tuning device 91 is grounded through the circuit board 92. The tuning device 91 can be used to adjust the impedance of the conductive structure 5 when the antenna 4 is operating, so as to avoid the conductive structure 5 being unable to effectively suppress the operating current of the cavity 20 when the antenna 4 is operating due to insufficient size. Schematic, the tuning device 91 can adjust its own device value by changing its own parameters. For example, the tuning device 91 may include a variable capacitor, a tuner, or a diode. By setting the tuning device 91 at the open end 51 of the conductive structure 5, the electrical length of the conductive structure 5 can be better influenced, or the resonant mode generated by the cavity 20 when the antenna 4 is operating can be tuned more effectively, reducing the influence of the resonant mode within the operating frequency band of the antenna 4 and improving the radiation efficiency of the antenna 4. In other embodiments, the tuning structure 9 can also be a slotted structure, that is, the electrical length of the conductive structure 5 can be adjusted by setting a slot near the open end 51. The specific setting of the slot can be referred to Figure 12 The design scheme for the center groove will not be elaborated further.

[0124] See Figure 20 In one embodiment, the grounding terminal 52 of the conductive structure 5 is connected to the first reference ground 11 through a spring or other conductive structure. In other embodiments, the grounding terminal 52 can also be grounded by setting a circuit board or FPC.

[0125] Figure 21 yes Figure 20 The schematic diagram of the terminal device 100 shown is from another perspective, combined with Figure 20and Figure 21 As shown, in one embodiment, the grounding terminal 52 is electrically connected to the first position 1111 of the first reference ground 11. The radiator 41 includes a grounding terminal 411, which is connected to the first position 1111 of the first reference ground 11. That is, the grounding terminal of the antenna 4 and the grounding terminal 52 of the conductive structure 5 are connected to the same position of the first reference ground 11. By electrically connecting the grounding terminal 52 to the first position 1111 of the first reference ground 11, and setting the grounding terminal 411 of the radiator 41 at the first position 1111, the influence of the conductive structure 5 on the current distribution of the radiator 41 of the antenna 4 can be reduced, thereby better ensuring the radiation efficiency of the antenna. Figure 21 As shown, in one embodiment, the position of the grounding terminal 411 of the radiator 41 on the first frame 12 overlaps with the position of the grounding terminal 52 of the conductive structure 5 on the first frame 12, that is... Figure 21 The portion within the dashed box. The grounding terminal 411 of the radiator 41 and the grounding terminal 52 of the conductive structure 5 are connected to the same position on the middle frame, namely the first position 1111.

[0126] Figure 22 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. Figure 23 yes Figure 22 The diagram shown is a schematic representation of the terminal device 100 from another perspective. Figure 24 yes Figure 22 The shown is a CC cross-sectional view of the terminal device 100. Figure 25 yes Figure 22 The DD cross-sectional view of the terminal device 100 shown.

[0127] See Figure 22 , Figure 23 , Figure 24 and Figure 25 The conductive structure 5 of the terminal device 100 includes a first conductive structure 53 and a second conductive structure 54. The first conductive structure 53 is disposed within the first main body 1 and close to the radiator 41 of the antenna 4. The second conductive structure 54 is disposed within the second main body 2. In one embodiment, the first conductive structure 53 and... Figure 20 The conductive structure 5 shown is identical in structure to the first conductive structure 53, which is located between the battery compartment retaining wall 152 and the first frame 12. The grounding terminal of the first conductive structure 53 is electrically connected to the first reference ground 11. In one embodiment, the second conductive structure 54 is similar to... Figure 19b The conductive structure 5 shown has the same structure. The grounding terminal of the second conductive structure 54 is connected to the second reference ground 21. The second conductive structure 54 and the second back cover of the second body 2 ( Figure 22 , Figure 23 , Figure 24 and Figure 25 The second back cover is not shown in the drawing; its specific structure can be found in [reference needed]. Figure 19b (As shown in the embodiment) the components are stacked, and the second conductive structure 54 can cover most of the area of ​​the second back cover. During the process of folding the first main body 1 and the second main body 2 relative to each other around the pivot 3, the display screen 8 is located on the outside of the folding direction, and the first conductive structure 53 and the second conductive structure 54 are relatively close to each other. In the folded state, the first conductive structure 53 can overlap with part of the second conductive structure 54.

[0128] In one embodiment, the rotating shaft 3 includes a rotating shaft body 31, a first door plate 32, and a second door plate 33. In the folded state, both the first door plate 32 and the second door plate 33 are located within the cavity 20. The first conductive structure 53 and the first door plate 32 are distributed on opposite sides of the first body 1 in the width direction. The second conductive structure 54 extends within the cavity 20 and is arranged side by side with the second door plate 33, avoiding the position of the second door plate 33, and there is no overlapping area between them. In the flattened state, the first body 1 and the second body 2 are relatively flattened, and the second conductive structure 54 in the second body 2 is far away from the antenna 4. Therefore, in the flattened state, the second conductive structure 54 will not affect the radiation performance of the antenna. This solution, by setting the first conductive structure 53 and the second conductive structure 54 within the cavity 20, can more effectively tune the cavity resonance mode generated by the cavity 20 when the antenna 4 is working, thereby improving the overall efficiency of the antenna 4.

[0129] Figure 26 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. Figure 27 yes Figure 26 The diagram shown is a schematic representation of the terminal device 100 from another perspective. Figure 28 yes Figure 26 The EE cross-sectional view of the terminal device 100 shown, combined with Figure 26 , Figure 27 and Figure 28 As shown, in one embodiment, the terminal device 100 is an S-shaped, three-fold mobile terminal with three main bodies: a first main body 1, a second main body 2, and a third main body 7, and two hinges 3. The first main body 1 and the second main body 2 are connected by one hinge 3, and the second main body 2 and the third main body 7 are connected by another hinge 3. The second main body 2 is connected between the first main body 1 and the third main body 7. In the folded state, the display screen 8 is located on the periphery of the first main body 1 and the second main body 2, and within the internal space enclosed by the second main body 2 and the third main body 7. The radiator 41 of the antenna 4 of the terminal device 100 is disposed on the first frame 12 of the first main body 1. In the folded state, a cavity 20 is formed between the first reference ground 11 of the first main body 1 and the second reference ground 21 of the second main body 2. The first frame 12 and the hinge 3 are disposed opposite each other at two opposite edges of the cavity 20, with the hinge 3 located at the inner edge of the cavity and the first frame 12 located at the outer edge of the cavity 20.

[0130] See also Figure 26 and Figure 28 The pivot 3 between the first main body 1 and the second main body 2 includes a pivot body 31, a first door panel 32, and a second door panel 33. In the folded state, the first door panel 32 and the second door panel 33 are positioned opposite each other between the first main body 1 and the second main body 2, and are both located on the inner edge of the cavity 20. The conductive structure 5 within the cavity 20 includes a first conductive structure 53 and a second conductive structure 54. The first conductive structure 53 is located within the first main body 1. The first conductive structure 53 and the first door panel 32 are distributed on opposite sides in the width direction of the first main body 1. The first conductive structure 53 is located between the battery compartment retaining wall 152 and the first frame 12. The first conductive structure 53 and... Figure 20 The conductive structure shown in Figure 5 has the same structure.

[0131] See also Figure 27 and Figure 28 The second conductive structure 54 is disposed within the second main body 2. The pivot 3 connecting the second main body 2 and the third main body 7 includes a pivot body 31, a third door plate 34, and a fourth door plate 35. In the folded state, the third door plate 34 is located on the side of the second main body 2 away from the third main body 7, and the fourth door plate 35 is located on the side of the third main body 7 away from the second main body 2. The third door plate 34 and the first frame 12 where the radiator 41 of the antenna 4 is located are arranged opposite each other, and the third door plate 34 is also arranged opposite to the first conductive structure 53, that is, the first frame 12 and the first conductive structure 53 are both located inside the third door plate 34 on the second main body 2 and in their vertical projection. In the width direction of the second main body 2, the second conductive structure 54 is arranged between the second door plate 33 and the third door plate 34. The second conductive structure 54 can be disposed on the back cover of the second main body 2. The positional relationship and connection relationship between the second conductive structure 54 and the back cover of the second main body 2 can be found in [reference needed]. Figure 19b The embodiment shown. In the folded state, the first conductive structure 53 and the second conductive structure 54 are staggered along the width direction of the terminal device, that is, the vertical projection of the first conductive structure 53 on the second body 2 does not intersect with the second conductive structure 54.

[0132] Figure 26 In the embodiment shown, the first conductive structure 53 has only one ground terminal and one open terminal. The ground terminal is connected to the same location as the ground terminal 411 of the radiator 41, namely the first location 1111, of the first reference ground 11.

[0133] Figure 29 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. Figure 29 The implementation methods shown are the same as Figure 26 The differences in the illustrated embodiments include the specific structure of the first conductive structure 53. See also... Figure 29In one embodiment, the first conductive structure 53 includes two grounding terminals, namely grounding terminal 531 and grounding terminal 533. Grounding terminal 533 is electrically connected to a first position 1111 of the first reference ground 11, and grounding terminal 531 is electrically connected to a second position 1112 of the first reference ground 11. Schematably, the first position 1111 and the second position 1112 may be located on opposite sides of the first reference ground 11 along the extension direction of the first frame 12. The first conductive structure 53 also includes two open terminals, namely open terminal 534 and open terminal 535. A gap is formed between the two open terminals. The radiator 41 of the antenna 4 includes two stubs with an insulating gap between them. In one embodiment, this insulating gap is directly opposite the gap between the two open terminals of the conductive structure 5. The radiator 41 includes a third grounding terminal 411 and a fourth grounding terminal 412, with the third grounding terminal 411 located at the first position 1111 and the fourth grounding terminal 412 located at the second position 1112. The structure and position of the first conductive structure 53 designed in this scheme correspond to the structure and position of the radiator 41 of the antenna 4, making the tuning effect of the first conductive structure 53 on the cavity mode more significant.

[0134] Figure 30 This is a graph showing the overall efficiency of antenna 4 in certain scenarios of a terminal device 100 provided in one embodiment. Curve A3 represents the overall efficiency curve of the cavity resonance of the terminal device 100 without the conductive structure; curve C3 is the overall efficiency curve of the cavity resonance of the terminal device 100 with the conductive structure inside the cavity; point P4 is the overall efficiency of the terminal device 100 without the conductive structure 5 at an operating frequency of 0.92 GHz. The antenna inside the terminal device is a low-frequency antenna, for example, the antenna can cover three frequency bands: B28, B5, and B8, for example, the operating frequency band of the antenna is 0.7 GHz-0.96 GHz. Point P5 is the overall efficiency of the cavity mode of the terminal device 100 with the conductive structure at a frequency of 0.94 GHz; point P6 is the overall efficiency of the cavity mode of the terminal device 100 with the conductive structure at a frequency of 0.81 GHz. The terminal device 100 without the conductive structure is affected by the cavity 20 resonance mode, and the cavity resonance frequency falls within the operating frequency band of the antenna, affecting the radiation efficiency of the antenna. Terminal devices with conductive structures can adjust the resonance of cavity modes through the conductive structure, so that the resonance of cavity modes is adjusted to the out-of-band of the antenna operating frequency band, thereby reducing the impact of cavity resonance modes on antenna radiation efficiency.

[0135] Figure 31 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. Figure 31 The illustrated embodiment provides a G-type folding tri-fold terminal device. See also... Figure 31In one embodiment, the terminal device 100 includes three main bodies (a first main body 1, a second main body 2, and a third main body 7) and two hinges 3. The first main body 1 and the third main body 7 are connected by one hinge 3, and the third main body 7 and the second main body 2 are connected by the other hinge 3. In the folded state, the second main body 2 is stacked between the first main body 1 and the third main body 7. In the unfolded state, the third main body 7 is connected between the second main body 2 and the first main body 1. The display screen 8 of the terminal device 100 is located inside the main body in the folded state. The portion of the display screen 8 connected to the first main body 1 is located on the side of the first main body 1 facing the second main body 2, the portion of the display screen 8 connected to the second main body 2 is located on the side of the second main body 2 facing the third main body 7, and the portion of the display screen 8 connected to the third main body 7 is located on the side of the third main body 7 facing the second main body 2. The display screen connected to the first main body 1 faces the back cover of the second main body 2. Figure 31 The back cover of the second main body 2 is not shown. The terminal device 100 includes an antenna 4. In one embodiment, the radiator 41 of the antenna 4 is disposed on the first frame 12 of the first main body 1. In the folded state, a cavity 20 is formed between the first reference ground 11 of the first main body 1 and the second reference ground 21 of the second main body 2. The first reference ground 11 may be a grounding layer connected to a portion of the display screen of the first main body 1, or the middle frame of the first main body 1, or the grounding layer of a circuit board within the first main body 1, or the grounding structure of other devices within the first main body 1. The second reference ground 21 may be the middle frame of the second main body 2, or a metal layer disposed on the middle frame of the second main body 2.

[0136] See Figure 31 In one embodiment, by providing a conductive structure 5 within the cavity 20, the influence of the cavity resonance mode generated by the cavity 20 on the radiation efficiency of the antenna 4 when the antenna 4 is operating in the folded state is resolved. In another embodiment, the conductive structure 5 is located at the edge of the display screen. Figure 32a This is a specific structural solution for setting a conductive structure at the edge of a display screen, as provided in one implementation method. Figure 32b This is another specific structural solution that provides a conductive structure at the edge of the display screen.

[0137] See Figure 31 , Figure 32a and Figure 32bIn one embodiment, the peripheral edge region of the display screen 8 has an insulating shell 8A that surrounds the display screen 8 and shields its edge. In another embodiment, a conductive structure 5 is constructed by providing a metal layer structure on the surface of a portion of the insulating shell 8A. The conductive structure 5 is formed by electroplating or coating a metal film layer on the insulating shell 8A near the edge of the first frame 12. The conductive structure 5 is electrically connected to a first reference ground 11. In one embodiment, the conductive structure 5 is located on the outer surface of the insulating shell 8A and is electrically connected to the first reference ground 11 via a conductive wire structure 8B. For example, the side and inner surface of the insulating shell 8A are provided with conductive wire structures 8B, which extend along the edge of the insulating shell 8A to the first reference ground 11 at the bottom of the display screen 8. In another embodiment, the side of the conductive structure 5 facing away from the insulating shell 8A is covered with a surface structure 40, which is an insulating material. The surface structure 40 shields the conductive structure 5 and surrounds the edge of the display screen 8. Since the physical length of the conductive structure 5 is limited by the length of the antenna radiator, the conductive structure 5 can only cover a part of the insulating shell 8A. The surface structure 40 is a complete structure surrounding the edge of the display screen 8. The surface structure 40 can cover all areas of the insulating shell 8A and is used to decorate the edge of the display screen 8.

[0138] In one implementation, Figure 32a In the illustrated embodiment, the conductive structure 5 can be electrically connected to the tuning device 91. For example, one end of the tuning device 91 is electrically connected to the conductive structure 5, and the other end of the tuning device 91 is connected to the first reference ground 11 via the circuit board 92. Schematic, the tuning device 91 can be loaded onto the electrical connection guide portion of the conductive structure 5, and the circuit board 92 can be a metal sheet.

[0139] Figure 33 This is a schematic diagram of the mating structure between a conductive structure 5 located at the edge of a display screen and a first reference ground 11, provided in one embodiment. Figure 32b and Figure 33 As shown, in one embodiment, one end of the tuning device 91 is matched and loaded to the open end 51 of the conductive structure 5 through the conductive wire structure 8B, and the other end of the tuning device 91 is electrically connected to the first reference ground 11 through the grounding spring 93. The grounding end 52 of the conductive structure 5 is connected to the first reference ground 11 through the spring 532. Figure 32b As shown, at least a portion of the conductive structure 5 is stacked between the surface structure 40 and the insulating shell 8A, with the surface structure 40 facing the back cover of the second body 2. Figure 33 As shown, the length of the conductive structure 5 in the extension direction is L0, and the size of L0 is equal to one-quarter of the wavelength corresponding to the resonant frequency in the operating frequency band of the antenna 4.

[0140] Figure 34 This is a schematic diagram of the interaction structure between the conductive structure 5 located at the edge of the display screen and the first reference ground 11, provided in another embodiment. (See attached diagram.) Figure 34 In one embodiment, the open end 51 of the conductive structure 5 may not be loaded with a tuning device, and the ground end 52 of the conductive structure 5 may still be connected to the first reference ground 11 through the spring 532.

[0141] In one embodiment, the conductive structure 5 is electrically connected to a specific location on the first reference ground 11 via the conductive wire structure 8B, which is also the location of the grounding terminal of the radiator 41 of the antenna 4. By setting the grounding terminal of the conductive structure 5 and the grounding terminal of the radiator 41 at the same location on the first reference ground 11, it can be ensured that the setting of the conductive structure 5 does not affect the current distribution on the ground connected to the radiator 41 of the antenna, and does not affect the current distribution of the radiator 41.

[0142] In one embodiment, the conductive structure 5 on the outer surface of the insulating shell 8A at the edge of the display screen 8 can be used alone in the terminal device to solve the cavity resonance mode in the folded state. In other embodiments, the conductive structure 5 on the outer surface of the insulating shell 8A at the edge of the display screen 8 can also be combined with conductive structures disposed in other locations to solve the cavity resonance mode in the folded state.

[0143] Figure 35 This is a schematic diagram of a terminal device 100 provided in another embodiment of this application. Figure 36 yes Figure 35 A cross-sectional view of the terminal device 100 shown. Figure 35 and Figure 36 The illustrated embodiment provides a G-type folding tri-fold terminal device. See also... Figure 35 and Figure 36 In one embodiment, the conductive structure 5 includes a first conductive structure 53 and a second conductive structure 54. The first conductive structure 53 in this embodiment can be connected with... Figure 31 The conductive structures shown are identical. The second conductive structure 54 is located on the second main body 2, and the grounding terminal of the second conductive structure 54 is connected to the second reference ground 21. In one embodiment, the second conductive structure 54 and the back cover of the second main body 2 are stacked, and the second conductive structure 54 can cover most of the width direction of the back cover 25 of the second main body 2. In the width direction of the terminal device in the folded state, the second conductive structure 54 is located between the first conductive structure 53 and the pivot 3, and there is no overlapping area between the second conductive structure 54 and the first conductive structure 53, and there is a gap between them.

[0144] like Figure 35As shown, in one embodiment, the conductive structure 5 can be electrically connected to the third position 1113 of the first reference ground 11 via a spring contact 532. For example, a slot structure for accommodating the spring contact can be provided on the insulating shell corresponding to the conductive structure 5, and the spring contact can be fixed therein. One end of the spring contact 532 abuts against the conductive structure 5 and the other end abuts against the first reference ground 11. The grounding terminal 413 of the radiator 41 of the antenna is also connected to the third position 1113 of the first reference ground 11.

[0145] Figure 37 yes Figure 31 The diagram shows the overall efficiency curve of the antenna in certain situations of the terminal device. In one embodiment, the antenna is a low-frequency antenna. For example, the antenna can cover three frequency bands: B28, B5, and B8. For example, the operating frequency band of the antenna is 0.7 GHz to 0.96 GHz. Figure 37 The A4 curve in the text is Figure 31 The system overall efficiency curve of the cavity resonant mode of the terminal device 100 shown is obtained by removing the conductive structure; curve B4 is... Figure 31 The diagram shows the overall efficiency curve of the cavity resonance mode of the terminal device 100 shown, with the conductive structure removed and the cavity blocked (i.e., no cavity resonance mode is generated); the C4 curve is... Figure 31 The overall efficiency curve of antenna 4 of terminal device 100 is shown. (See attached image.) Figure 31 and Figure 37 As shown in curve A4, the terminal device 100 without the conductive structure 5 is affected by the resonant mode of cavity 20. The resonant frequency of cavity 20 falls within the antenna's operating frequency band, affecting the antenna's radiation efficiency. As shown in curve B4, after the cavity is blocked, the cavity mode has almost no resonant mode and does not affect the antenna's radiation efficiency. As shown in curve C4, by setting the conductive structure, the resonance of the cavity mode is tuned to around 1.12 GHz. At this time, the resonance of the cavity mode is located outside the antenna's operating frequency band and does not affect the antenna's radiation efficiency.

[0146] Figure 38 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. (See attached diagram.) Figure 38 In one embodiment, the terminal device 100 is a foldable mobile terminal with an inward folding design, having a first main body 1, a second main body 2, and a hinge 3. The terminal device 100 includes a display screen 8, which includes a first display portion 81 located inside the first main body 1 in the folded state, a second display portion 82 located inside the second main body 2, and a first bent portion 84 connecting the first display portion 81 and the second display portion 82. The terminal device 100 includes an antenna 4 and a conductive structure 5. The radiator 41 of the antenna 4 is located on a first frame 12 of the first main body 1, and the first frame 12 and the hinge 3 are disposed opposite each other. The conductive structure 5 is located at the edge of the first display portion 81. In this embodiment, the conductive structure 5 can be connected to... Figure 31 The conductive structures shown are identical. The conductive structure 5 is electrically connected to the first reference ground 11 inside the first main body 1. The first reference ground 11 can be the grounding layer on the bottom side of the display screen 8, or it can be the grounding layer of the middle frame inside the first main body 1, or the grounding layer of the circuit board disposed on the middle frame, or the conductive shell of the electronic device disposed on the middle frame, etc.

[0147] In this specific embodiment, a conductive structure 5 is provided on the outer surface of the edge of the display screen. By utilizing the insulating shell at the edge of the display screen, no additional components are introduced. While maintaining the PEC boundary conditions of the first reference ground 11, cavity resonance can be suppressed. The PEC boundary conditions refer to the perfect electrical conductor (PEC) boundary conditions. This solution can reduce the negative impact of the cavity resonance mode in the operating frequency band of the antenna 4 and improve the radiation efficiency of the antenna 4.

[0148] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0149] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, possible embodiments of this application and features thereof can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A terminal device, characterized in that, The device includes a main body, an antenna, and a conductive structure. The main body includes a first main body and a second main body that can be folded and flattened relative to each other. The first main body includes a first reference ground, and the second main body includes a second reference ground. In the folded state, the first main body and the second main body form a cavity between them. The antenna is disposed on the edge of the main body. The conductive structure is located between the first main body and the second main body in the folded state. The conductive structure includes a ground terminal and an open terminal. The ground terminal is electrically connected to the first reference ground or the second reference ground. The conductive structure is related to the resonant frequency of the cavity and is used to tune the resonant frequency of the cavity to the out-of-band of the antenna's operating frequency band.

2. The terminal device according to claim 1, characterized in that, The antenna operates in the first frequency band. When the antenna is in the working state, and the terminal device with the conductive structure is in the folded state, the cavity is excited to generate a first resonant mode. When the terminal device does not have the conductive structure and is in a folded state, the cavity is excited by the antenna to generate a second resonant mode, and the resonant point of the cavity in the second resonant mode is located within the band of the first frequency band.

3. The terminal device according to claim 2, characterized in that, The extension direction of the frame where the antenna is located is the first direction, and the arrangement direction of the ground terminal and the open terminal is the first direction.

4. The terminal device according to claim 3, characterized in that, The conductive structure is used to suppress the current distribution along the first direction on the first reference ground or the second reference ground, so that the resonant point of the cavity in the first resonant mode is located outside the first frequency band.

5. The terminal device according to any one of claims 1-4, characterized in that, The frequencies within the operating frequency band of the antenna include a minimum frequency and a maximum frequency, and the side length of the first reference ground or the second reference ground along the first direction is between half the electrical length of the wavelength corresponding to the minimum frequency and half the electrical length of the wavelength corresponding to the maximum frequency.

6. The terminal device according to any one of claims 1-4, characterized in that, The frequencies within the operating frequency band of the antenna include the lowest frequency and the highest frequency, and the electrical length of the conductive structure extending along the first direction is between one-quarter of the electrical length of the wavelength corresponding to the lowest frequency and one-quarter of the electrical length of the wavelength corresponding to the highest frequency.

7. The terminal device according to any one of claims 1-6, characterized in that, The operating frequency range of the antenna is 0.7GHz-0.96GHz.

8. The terminal device according to any one of claims 1-7, characterized in that, Both the antenna and the conductive structure are located on the first main body, and the grounding terminal of the antenna and the grounding terminal of the conductive structure are connected to the same location of the first reference ground.

9. The terminal device according to any one of claims 1-7, characterized in that, The antenna is disposed on the first main body, the conductive structure is disposed on the second main body, the grounding terminal of the antenna is connected to the first reference ground, and the grounding terminal of the conductive structure is connected to the second reference ground.

10. The terminal device according to any one of claims 1-9, characterized in that, The first main body includes a first back cover, and the second main body includes a second back cover. Both the first and second back covers are made of insulating material. In the folded state, the first and second back covers are stacked between the first reference ground and the second reference ground; or, The first main body includes a first back cover, which is made of insulating material. In a folded state, the first back cover is stacked between the first reference ground and the second reference ground; or, The second main body includes a second back cover, which is made of insulating material. In the folded state, the second back cover is stacked between the first reference ground and the second reference ground.

11. A terminal device, characterized in that, include: The main body includes a first main body, a second main body, and a pivot. The first main body and the second main body are connected by the pivot and can be folded and flattened relative to each other. The edge of the first main body includes a first short side and a first long side. The first short side is connected between one end of the pivot and the first long side. The edge of the second main body includes a second short side and a second long side. The second short side is connected between one end of the pivot and the second long side. The first long side and the second long side are both disposed opposite to the pivot and their extension directions are both a first direction. The first main body includes a first reference ground, and the second main body includes a second reference ground. When the first main body and the second main body are folded relative to each other, a cavity is formed between the first main body and the second main body. The antenna is disposed on the first long side or the second long side; and The conductive structure, in its folded state, is located between the first body and the second body. The conductive structure includes a ground end and an open end, which are arranged along the first direction.

12. The terminal device according to claim 11, characterized in that, The first main body includes a battery compartment retaining wall, which is adjacent to the frame where the antenna is located, and the gap between the battery compartment retaining wall and the frame where the antenna is located forms a receiving cavity, and the conductive structure is located in the receiving cavity.

13. The terminal device according to claim 12, characterized in that, It also includes a tuning structure located at the open end of the conductive structure and electrically connected to the conductive structure, the tuning structure being used to adjust the electrical length of the conductive structure.

14. The terminal device according to claim 13, characterized in that, The tuning structure includes a circuit board and a tuning device disposed on the circuit board. The circuit board is located at the open end of the conductive structure, and the tuning device is electrically connected between the conductive structure and ground.

15. The terminal device according to claim 11, characterized in that, The antenna is disposed on the frame of the first main body, and the display screen of the terminal device includes a first display portion connected to the first main body. In the folded state, the first display portion is located between the first main body and the second main body. The conductive structure is located at the edge of the first display portion and is electrically connected to the first reference ground.

16. The terminal device according to claim 15, characterized in that, The terminal device includes an insulating shell located at the edge of the first display portion, and the conductive structure located on the outer surface of the insulating shell.

17. The terminal device according to claim 15, characterized in that, The terminal device further includes a tuning structure located at the open end of the conductive structure and electrically connected between the open end and the first reference ground.

18. The terminal device according to claim 16 or 17, characterized in that, The terminal device includes a surface structure covering the insulating shell, the surface structure being an insulating material, and the conductive structure being located between the surface structure and the insulating shell.

19. The terminal device according to claim 11, characterized in that, The first main body includes a first back cover, and the second main body includes a second back cover. Both the first back cover and the second back cover are made of insulating material. The conductive structure and the first back cover are stacked and cover most of the area of ​​the first back cover; or, the conductive structure and the second back cover are stacked and cover most of the area of ​​the second back cover.

20. The terminal device according to any one of claims 11-19, characterized in that, The conductive structure includes a conductive body and a groove provided on the conductive body, the groove being used to adjust the resonant frequency of the cavity resonant mode.

21. The terminal device according to claim 11, characterized in that, The conductive structure includes a first conductive structure and a second conductive structure. The first conductive structure is disposed on the first main body. The first main body includes a battery compartment retaining wall. The battery compartment retaining wall, the frame where the antenna is located, and a portion of the edge area of ​​the display screen of the terminal device together form a receiving cavity. The first conductive structure is located within the receiving cavity. The second conductive structure is disposed on the second main body. The grounding terminal of the second conductive structure is connected to the second reference ground. The second conductive structure and the second back cover of the second main body are stacked and cover most of the area of ​​the second back cover.

22. The terminal device according to claim 21, characterized in that, The vertical projection of the first conductive structure onto the plane where the second back cover is located has no intersection with the second conductive structure and is spaced apart.

23. The terminal device according to claim 11, characterized in that, The conductive structure includes a first conductive structure and a second conductive structure. The first conductive structure is disposed on the first main body. The antenna is disposed on the frame of the first main body. The display screen of the terminal device includes a first display portion connected to the first main body. In the folded state, the first display portion is located between the first main body and the second main body. The first conductive structure is located at the edge of the first display portion. The first conductive structure is electrically connected to the first reference ground. The second conductive structure is disposed on the side of the second body facing the first display portion, the grounding end of the second conductive structure is connected to the second reference ground, and the second conductive structure and the second back cover of the second body are stacked and cover most of the area of ​​the second back cover.

24. The terminal device according to claim 11, characterized in that, An insulating medium is provided between the conductive structure and the reference ground, wherein the reference ground is either the first reference ground or the second reference ground, and the insulating medium is used to support the part of the conductive structure other than the grounding terminal.

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