Smart watch and control method

Abstract

The invention discloses a smart watch and a control method, and belongs to the technical field of electronic equipment. The smart watch provided by the embodiment of the invention comprises a metal frame, a bottom shell, a printed circuit board, a first feed structure and a second feed structure, the metal frame and the bottom shell are connected to form an accommodating space, and the printed circuit board is located in the accommodating space; a first antenna is formed by the metal frame, a second antenna is arranged on the inner side or the outer side of the bottom shell, the metal frame is connected with the first feed structure, the second antenna is connected with the second feed structure, a radio frequency module, a change-over switch, a sensor and a controller are arranged on the printed circuit board, and the controller is connected with the sensor and the first end of the change-over switch. The first end of the change-over switch is also connected with the radio frequency module; the sensor is used for detecting the current posture of the smart watch and sending a first signal to the controller, and the controller is used for controlling the second end of the change-over switch to be connected with the first feed structure or the second feed structure according to the first signal.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic equipment, and specifically relates to a smart watch and a control method. Background Art

[0002] In recent years, smart wearable devices have become increasingly important for sports and health monitoring, placing increasing demands on their positioning capabilities. Smartwatches can be worn while cycling, walking, running, and more. As the scene changes, the watch's posture also changes. Currently, smartwatch antennas have a fixed, single directional pattern, which cannot guarantee that the antenna will always point toward the sky in different postures, affecting antenna performance. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a smart watch and a control method, which can solve the problem of a fixed and single antenna pattern of a smart watch in the related art.

[0004] In a first aspect, an embodiment of the present application provides a smartwatch, comprising a metal frame, a bottom shell, a printed circuit board, a first feeding structure, and a second feeding structure, wherein the metal frame and the bottom shell are connected to form a receiving space, and the printed circuit board is located in the receiving space;

[0005] The metal frame constitutes a first antenna, a second antenna is provided on the inner or outer side of the bottom shell, the metal frame is connected to the first feeding structure, the second antenna is connected to the second feeding structure, a radio frequency module, a switch, a sensor, and a controller are provided on the printed circuit board, the controller is connected to the sensor and the first end of the switch, and the first end of the switch is also connected to the radio frequency module;

[0006] In which, the sensor is used to detect the current posture of the smart watch and send a first signal to the controller, the first signal is used to indicate that the current posture of the smart watch is the first posture or the second posture. When the current posture of the smart watch is the first posture, the controller is used to control the second end of the switching switch to be connected to the first feeding structure according to the first signal, the working antenna of the smart watch is the first antenna, and the antenna pattern of the first antenna is facing the sky; when the current posture of the smart watch is the second posture, the controller is used to control the second end of the switching switch to be connected to the second feeding structure according to the first signal, the working antenna of the smart watch is the second antenna, and the antenna pattern of the second antenna is facing the sky.

[0007] In a second aspect, an embodiment of the present application further provides a control method, which is applied to the smartwatch according to the first aspect, and the method includes:

[0008] Obtaining the current posture of the smartwatch;

[0009] When the current posture of the smart watch is the first posture, controlling the second end of the switching switch to be connected to the first feeding structure, the working antenna of the smart watch is the first antenna, and the antenna pattern of the first antenna is facing the sky;

[0010] When the current posture of the smart watch is the second posture, the second end of the control switch is connected to the second feeding structure, the working antenna of the smart watch is the second antenna, and the antenna pattern of the second antenna is facing the sky.

[0011] In an embodiment of the present application, the metal frame of the smart watch constitutes the first antenna, and the inner or outer side of the bottom shell of the smart watch is provided with a second antenna. Through the current posture of the smart watch detected by the sensor, the controller can control the switch to connect to the first feeding structure or the second feeding structure, thereby enabling the smart watch to select the first antenna or the second antenna as the working antenna according to the change of its posture, so that the antenna pattern of the working antenna (first antenna or second antenna) of the smart watch is facing the sky in different postures, thereby effectively ensuring the antenna performance of the working antenna, and effectively ensuring that the smart watch can have good communication performance in different postures. Through the setting of the first antenna and the second antenna, the antenna pattern of the smart watch is no longer fixed, effectively improving the adjustability and flexibility of the antenna pattern of the smart watch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is one of the structural diagrams of a smart watch provided in an embodiment of the present application;

[0013] Figure 2 This is the second structural diagram of a smart watch provided in an embodiment of the present application;

[0014] Figure 3 This is one of the cross-sectional views of a smart watch provided in an embodiment of the present application;

[0015] Figure 4 This is a schematic diagram of the connection between a switch and a first antenna and a second antenna in a smart watch provided by an embodiment of the present application;

[0016] Figure 5 This is an efficiency diagram of the first antenna in a smartwatch provided by an embodiment of the present application;

[0017] Figure 6This is the antenna pattern of the first antenna in a smartwatch provided in an embodiment of the present application;

[0018] Figure 7 This is an efficiency diagram of the second antenna in a smartwatch provided by an embodiment of the present application;

[0019] Figure 8 This is the antenna pattern of the second antenna in a smartwatch provided in an embodiment of the present application;

[0020] Figure 9 This is a 2D cross-sectional comparison diagram of antenna patterns of a first antenna and a second antenna at Phi=0° in a smartwatch provided by an embodiment of the present application;

[0021] Figure 10 This is a 2D cross-sectional comparison diagram of antenna patterns of a first antenna and a second antenna at Phi=90° in a smartwatch provided by an embodiment of the present application;

[0022] Figure 11 This is a 2D cross-sectional comparison diagram of antenna patterns of a first antenna and a second antenna at Theta = 90° in a smartwatch provided by an embodiment of the present application;

[0023] Figure 12 This is a schematic diagram of the isolation between the first antenna and the second antenna in a smartwatch provided in an embodiment of the present application;

[0024] Figure 13 This is a cross-sectional diagram of the electric field of the first antenna in a smart watch provided in an embodiment of the present application;

[0025] Figure 14 This is a cross-sectional diagram of the electric field of the second antenna in a smartwatch provided in an embodiment of the present application;

[0026] Figure 15 This is a comparison diagram of the electric field sections of the first antenna and the second antenna in a smart watch provided by an embodiment of the present application;

[0027] Figure 16 This is a current distribution diagram of the first antenna in a smart watch provided in an embodiment of the present application;

[0028] Figure 17 This is a current distribution diagram of the second antenna in a smartwatch provided in an embodiment of the present application;

[0029] Figure 18 This is a comparison diagram of the antenna directional patterns of a smartwatch provided by an embodiment of the present application in which the second antenna is not grounded and in which two points are grounded;

[0030] Figure 19 Polarization analysis diagram of the first antenna in a smartwatch provided in an embodiment of the present application;

[0031] Figure 20 This is one of the schematic diagrams of circular polarization of the first antenna in a smart watch provided in an embodiment of the present application;

[0032] Figure 21 This is a second cross-sectional view of a smart watch provided in an embodiment of the present application;

[0033] Figure 22 This is the third structural diagram of a smart watch provided in an embodiment of the present application;

[0034] Figure 23 This is a third cross-sectional view of a smart watch provided in an embodiment of the present application;

[0035] Figure 24 This is the second schematic diagram of circular polarization of the first antenna in a smartwatch provided in an embodiment of the present application;

[0036] Figure 25 This is one of the schematic diagrams of the axis ratio of the first antenna in a smart watch provided in an embodiment of the present application;

[0037] Figure 26 This is the third schematic diagram of circular polarization of the first antenna in a smartwatch provided in an embodiment of the present application;

[0038] Figure 27 This is the second schematic diagram of the axis ratio of the first antenna in a smart watch provided in an embodiment of the present application;

[0039] Figure 28 This is the fourth schematic diagram of circular polarization of the first antenna in a smartwatch provided in an embodiment of the present application;

[0040] Figure 29 This is the fifth circular polarization diagram of the first antenna in a smartwatch provided in an embodiment of the present application;

[0041] Figure 30 A flow chart of a control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0044] The following describes the smart watch and control method provided in the embodiments of the present application with reference to the accompanying drawings.

[0045] Please refer to Figures 1 to 4 as well as Figures 21 to 23 , an embodiment of the present application provides a smart watch, including a metal frame 10, a bottom shell 21, a printed circuit board 30, a first feeding structure 40 and a second feeding structure 50, wherein the metal frame 10 is connected to the bottom shell 21 to form a receiving space, and the printed circuit board 30 is located in the receiving space. Exemplarily, the receiving space can also accommodate a display module 300, a battery 400, a shielding cover 35 of the printed circuit board 30, etc. The side of the metal frame 10 facing away from the bottom shell 21 is connected to the cover plate 200, and the cover plate 200 is arranged on the side of the display module 300 facing away from the bottom shell 21, and is used to protect the display module 300. The cover plate 200 can be a glass cover plate.

[0046] The metal frame 10 forms the first antenna of the smartwatch. The second antenna 20 is provided on the inner or outer side of the bottom case 21. The printed circuit board 30 is provided with a radio frequency module 31, a switch 32, a sensor 36, and a controller 37. The controller 37 is connected to the sensor 36 and the first end of the switch 32. The first end of the switch 32 is also connected to the radio frequency module 31. The sensor 36 is used to detect the current posture of the smartwatch and send a first signal to the controller 37. The first signal is used to indicate whether the current posture of the smartwatch is the first posture or the second posture. When the current posture of the smartwatch is the first posture, the controller 37 is used to control the second end of the switch 32 to connect to the first feeding structure 40 based on the first signal. The first antenna is the working antenna of the smartwatch, and the antenna pattern of the first antenna is facing the sky. When the current posture of the smartwatch is the second posture, the controller 37 is used to control the second end of the switch 32 to connect to the second feeding structure 50 based on the first signal. The second antenna 20 is the working antenna of the smartwatch, and the antenna pattern of the second antenna 20 is facing the sky.

[0047] In the embodiment of the present application, the metal frame 10 constitutes the first antenna of the smart watch, and the first antenna can generate an antenna radiation pattern perpendicular to the smart watch screen; a second antenna 20 is provided on the inner or outer side of the bottom shell 21 of the smart watch, and the second antenna 20 can generate an antenna radiation pattern parallel to the plane where the smart watch screen is located (or it can also be called a horizontal radiation pattern), that is, the smart watch can generate antenna radiation patterns in different directions through the first antenna and the second antenna 20.

[0048] The smartwatch's printed circuit board 30 is equipped with a radio frequency module 31, a switch 32, a sensor 36, and a controller 37. The sensor 36 can detect the smartwatch's current posture in real time and send a first signal to the controller 37. The first signal is used to indicate whether the smartwatch's current posture is the first posture or the second posture. The controller 37 can then promptly learn the smartwatch's current posture and control the switching of the switch based on the smartwatch's current posture. Optionally, the sensor 36 includes, but is not limited to, a gravity sensor, an acceleration sensor, an angle sensor, and the like. For example, when a user is wearing a smart watch and is riding, the screen of the smart watch is facing the sky. At this time, the sensor 36 detects that the current posture of the smart watch is the first posture, and the controller 37 controls the second end of the switching switch 32 to be connected to the first feeding structure 40, and the first feeding structure 40 is connected to the metal frame 10 (that is, the first antenna). At this time, the RF module 31 can be connected to the first antenna through the switching switch 32. At this time, the first antenna is the working antenna of the smart watch, and the first antenna can generate an antenna radiation pattern perpendicular to the smart watch screen, that is, the antenna radiation pattern generated by the first antenna is facing the sky, thereby effectively ensuring the antenna performance of the first antenna, and making the smart watch have better antenna performance in the first posture.

[0049] For another example, when a user wears a smart watch and is walking or running, the user's arm is in a drooping state, and the screen of the smart watch is not facing the sky, but is close to vertical to the sky or at a certain angle. At this time, the sensor 36 detects that the current posture of the smart watch is the second posture, and the controller 37 controls the second end of the switching switch 32 to be connected to the second feeding structure 50, and the second feeding structure 40 to be connected to the second antenna. At this time, the RF module 31 can be connected to the second antenna 20 through the switching switch 32. At this time, the second antenna 20 is the working antenna of the smart watch, and the second antenna 20 can generate an antenna radiation pattern parallel to the plane where the smart watch screen is located, that is, the antenna radiation pattern generated by the second antenna 20 is also facing the sky, thereby effectively ensuring the antenna performance of the second antenna 20, so that the smart watch also has better antenna performance in the second posture.

[0050] Please further combine Figure 4A first matching circuit 33 may be connected between the switch 32 and the metal frame 10 (i.e., the first antenna). For example, one end of the first matching circuit 33 is connected to the switch 32, and the other end is connected to the first feeding structure 40. A second matching circuit 34 may be connected between the switch 32 and the second antenna 20. For example, one end of the second matching circuit 34 is connected to the switch 32, and the other end is connected to the second feeding structure 50.

[0051] In the embodiment of the present application, the metal frame 10 of the smart watch constitutes the first antenna, and the second antenna 20 is provided on the inner or outer side of the bottom shell 21 of the smart watch. The current posture of the smart watch detected by the sensor 36 is the first posture or the second posture. The controller 37 can control the switch 32 to connect to the first antenna or the second antenna 20, thereby enabling the smart watch to select the first antenna or the second antenna 20 as the working antenna according to the change of its posture. The antenna pattern of the working antenna (the first antenna or the second antenna 20) of the smart watch is facing the sky in different postures, thereby effectively ensuring the antenna performance of the working antenna, and effectively ensuring that the smart watch can have good communication performance in different postures. By setting the first antenna and the second antenna 20, the antenna pattern of the smart watch is no longer fixed, effectively improving the adjustability and flexibility of the antenna pattern of the smart watch.

[0052] It should be noted that the RF module 31 in the embodiment of the present application may be a Global Positioning System (GPS) RF module 31, or may be a RF module 31 of other antenna types, and the embodiment of the present application does not specifically limit this.

[0053] Optionally, the switch 32 is a single-pole double-throw switch, so that the radio frequency module 31 can be connected to the first antenna or the second antenna 20 through the single-pole double-throw switch.

[0054] In the embodiment of the present application, the first feeding structure 40 can be a metal dome, one end of which is electrically connected to the metal frame 10, and the other end is used to connect to the second end of the switch 32. The second feeding structure 50 can also be a metal dome, one end of which is electrically connected to the second antenna 20, and the other end is used to connect to the second end of the switch 32. The first end (the fixed end) of the switch 32 is connected to the RF module 31 and the controller 37. The controller 37 can control the second end of the switch 32 to connect to the first feeding structure 40 or the second feeding structure 50, thereby electrically connecting the first feeding structure 40 or the second feeding structure 50 to the RF module 31, that is, realizing the electrical connection between the first antenna or the second antenna 20 and the RF module 31.

[0055] Optionally, the first feeding structure 40 and the second feeding structure 50 are arranged adjacent to each other. Figure 1 As shown, the first feeding structure 40 is a metal spring, and the first feeding structure 40 is electrically connected to the RF module 30 of the printed circuit board 30 through the first feeding position 41; the second feeding structure 50 is electrically connected to the RF module 30 of the printed circuit board 30 through the second feeding position ( Figure 1 The position indicated by number 3 in FIG) is electrically connected to the radio frequency module 31 of the printed circuit board 30. Figure 1 and Figure 22 As shown, the first feeding structure 40 and the second feeding structure 50 are adjacently arranged, both located at 1 o'clock direction of the smart watch ( Figure 1 Shown is the rear view of the smartwatch).

[0056] The following combination Figures 5 to 17 The related performances of the first antenna and the second antenna 20 are described.

[0057] like Figure 5 Shown is the efficiency of the first antenna, Figure 5 The green line in the middle shows the efficiency with antenna matching taken into account, and the red line shows the efficiency without taking antenna matching into account. It can be seen that the efficiency of the first antenna is -12.8dB; Figure 6 is the antenna pattern of the first antenna; Figure 7 The figure shows the efficiency of the second antenna 20. It can be seen that the efficiency of the second antenna 20 is -10dB. Figure 8 is the antenna pattern of the second antenna 20; Figure 9 is a 2D cross-sectional comparison diagram of the antenna patterns of the first antenna and the second antenna 20 at Phi=0°, Figure 10 is a 2D cross-sectional comparison diagram of the antenna patterns of the first antenna and the second antenna 20 at Phi=90°, Figure 11 This is a 2D cross-sectional comparison diagram of the antenna patterns of the first antenna and the second antenna 20 at Theta = 90°. It can be seen from the comparison diagrams that the antenna patterns of the first antenna and the second antenna 20 are complementary. Therefore, the smart watch can select the optimal antenna pattern so that the smart watch can select the antenna with better performance as the working antenna in various postures, which can effectively improve the user's GPS experience in various scenarios. For example, in a cycling scenario, the first antenna can be selected. The first antenna can generate an antenna pattern perpendicular to the smart watch screen. In scenarios where the user's arm is drooping, such as walking, the second antenna 20 can be selected. The second antenna 20 can generate a horizontal omnidirectional (parallel to the smart watch screen) antenna pattern. As a result, the smart watch can select the antenna with the best performance in any scenario, so that the antenna pattern is always facing the sky, effectively improving the communication performance of the smart watch and thus improving the user experience.

[0058] Figure 12 The figure shows the isolation between the first antenna and the second antenna 20. Figure 13 This is a cross-sectional diagram of the electric field of the first antenna. Its main radiation is generated by the gap between the metal frame 10 and the watch screen; Figure 14 This is a cross-sectional diagram of the electric field of the second antenna 20. Its main radiation is generated by the metal of the entire smart watch (including the metal frame 10, battery 400, printed circuit board 30, etc.) and the human body. The human body acts as the ground of the second antenna 20, thereby greatly increasing the radiation aperture of the second antenna 20 and making the second antenna 20 more efficient.

[0059] Figure 15 is a comparison diagram of the electric field sections of the first antenna and the second antenna 20, Figure 16 is the current distribution diagram of the first antenna, Figure 17 is the current distribution diagram of the second antenna 20. Figure 16 As shown, by directly feeding the metal frame 10, two modes of the first antenna can be excited: the long side mode and the short side mode. The long side mode and the short side mode are 90 degrees out of phase and orthogonal to each other. By feeding at different positions, the order of exciting the two modes can be changed, thereby adjusting the polarization mode of the first antenna. Therefore, if the first antenna only needs one feeding position, it can be fed at a position close to the corner of the smart watch (such as 11 o'clock, 1 o'clock, 5 o'clock, and 7 o'clock), and circular polarization can be achieved. For example, if it is fed at 1 o'clock, as shown in FIG. Figure 16 As shown, a phase of 0 degrees corresponds to the long-side mode, and a phase of 90 degrees corresponds to the short-side mode. This means that the long-side mode is excited first, followed by the short-side mode, achieving right-hand circular polarization. Compared to related techniques that separately excite two radiators of different lengths, the solution provided in this application allows for overlapping modes, allowing only a single radiator to excite both modes, facilitating antenna miniaturization and enhancing appearance.

[0060] Optionally, the second antenna 20 is any one of the following:

[0061] A metal sheet embedded in the inner side of the bottom shell 21;

[0062] A flexible circuit board attached to the inner side of the bottom shell 21;

[0063] A conductor is provided on the outer surface of the bottom shell 21 .

[0064] Please refer to Figure 1 and Figure 3 In one embodiment, the second antenna 20 is a metal sheet embedded inside the bottom case 21. For example, the second antenna 20 can be formed by injection-molding a steel sheet into a plastic mold of the bottom case 21. The steel sheet molded inside the bottom case 21 also serves as the second antenna 20. This approach can effectively reduce the manufacturing cost of the second antenna 20. It should be noted that the "inside" of the bottom case 21 here refers to the side of the bottom case 21 facing the smartwatch screen.

[0065] Optionally, the bottom shell 21 has a thickness of 0.7 to 1.0 mm, and the metal sheet embedded in the inner side of the bottom shell 21 has a thickness of 0.1 to 0.4 mm. The metal sheet can be an annular structure with a diameter of 22 to 28 mm, and a light-transmitting hole is provided in the middle of the metal sheet for transmitting light. It should be noted that when the bottom shell 21 of the smartwatch is provided with a boss, for example, the bottom shell 21 has a boss protruding in the direction away from the smartwatch screen, or the boss is closer to the human body (for example, the wrist wearing the smartwatch), the metal sheet can be positioned near the boss, which brings the second antenna 20 closer to the human body, and the human body can be used as a ground for the second antenna 20, effectively increasing the radiation aperture of the second antenna 20, thereby effectively improving the radiation efficiency and antenna performance of the second antenna 20.

[0066] Please refer to Figure 21 In another embodiment, the second antenna 20 is a flexible printed circuit (FPC) attached to the inner side of the bottom shell 21, which makes the design of the second antenna 20 simpler and lowers the cost.

[0067] Please refer to Figure 22 and Figure 23 In another embodiment, the second antenna 20 is a conductor provided on the outer surface of the bottom shell 21. For example, the second antenna 20 can be formed on the outer surface of the bottom shell 21 by using a printing process of conductive silver paste (such as a direct pad printing process (Printing Direct Structure, PDS)). This method makes the antenna performance of the second antenna 20 better and the design method more flexible.

[0068] In the embodiment of the present application, the first antenna is formed by the metal frame 10 of the smart watch, and the metal frame 10 can be a square structure or a circular structure. Figure 1 and Figure 22 As shown, the metal frame 10 is a square structure that is slightly longer at the 12 o'clock direction and the 6 o'clock direction. The length of the metal frame 10 is 43mm to 50mm and the width is 35mm to 40mm. Alternatively, Figure 29 As shown, the metal frame 10 may also be a circular structure, and the diameter of the circular structure ranges from 42 mm to 48 mm.

[0069] Optionally, the metal frame 10 is an annular or square structure, and the circumference of the metal frame 10 matches the wavelength of the target frequency band. In other words, the metal frame 10 is a complete annular or square structure without any gaps in the middle, and the circumference of the metal frame 10 matches the wavelength of the target frequency band. For example, if the RF module 31 is a GPS RF module 31, that is, the first antenna and the second antenna 20 are GPS antennas, then the circumference of the metal frame 10 matches a wavelength in the GPS frequency band. In this way, the first antenna formed by the metal frame 10 can achieve the performance of a GPS antenna.

[0070] Optionally, the smartwatch further includes a first grounding structure 100, one end of which is connected to the metal frame 10 and the other end is grounded. In other words, the first grounding structure 100 serves as the grounding structure for the first antenna. For example, the first grounding structure 100 may be a metal shrapnel. The provision of the metal shrapnel helps to increase the buffering performance between the first grounding structure 100 and the metal frame 10, and the metal shrapnel also contributes to the development of smartwatches that are lighter and thinner.

[0071] Optionally, a first component 70 is further provided on the printed circuit board 30. The first component 70 may be a capacitor or an inductor. One end of a first grounding structure 100 is connected to the metal frame 10, and the other end of the first grounding structure 100 is connected to the capacitor or inductor. For example, the other end of the first grounding structure is connected to the capacitor or inductor via a microstrip line on the printed circuit board 30, and the other end of the capacitor or inductor is connected to the ground of the printed circuit board 30. The provision of the capacitor or inductor enables tuning of the first antenna through the capacitor or inductor. For example, if the perimeter of the metal frame 10 does not match the wavelength of the target frequency band, the operating frequency band of the first antenna (metal frame 10) can be matched to the target frequency band through tuning of the capacitor or inductor. If the size of the metal frame 10 is appropriate, for example, if the perimeter of the metal frame 10 matches a wavelength of the GPS frequency band, the grounding position (the ground of the printed circuit board 30) can be eliminated or left in a suspended state. The suspended state means that the capacitor or inductor is not connected to the ground of the printed circuit board 30.

[0072] Optionally, the smartwatch further includes at least one second grounding structure 62, one end of the second grounding structure 62 is connected to the second antenna 20, and the other end is grounded. In other words, the second grounding structure 62 is the grounding structure of the second antenna 20. Figure 1 、 Figure 2 、 Figure 22As shown, the second antenna 20 includes at least one second grounding structure 62, which can change the antenna pattern of the second antenna 20, for example, to produce a horizontal omnidirectional antenna pattern (i.e., parallel to the direction of the smartwatch screen). In this way, if the smartwatch screen is not facing the sky, the smartwatch can switch to the second antenna 20 as the working antenna. The second antenna 20 can produce a horizontal omnidirectional antenna pattern, so the antenna pattern generated by the second antenna 20 is facing the sky, which can effectively ensure the communication performance of the smartwatch.

[0073] Please refer to Figure 18 , Figure 18 The antenna pattern of the second antenna 20 when not grounded is compared with that when grounded at two points (i.e., including two second grounding structures 62). By multi-point grounding (i.e., including multiple second grounding structures 62), the antenna pattern of the second antenna 20 can be changed, for example, from a direction perpendicular to the smart watch screen to a direction parallel to the smart watch screen. By multi-point grounding, the current of the second antenna 20 is an eddy current converging toward the center, thereby generating a horizontal omnidirectional antenna pattern (i.e., parallel to the smart watch screen).

[0074] It should be noted that when there are three or more second grounding structures 62 , the spacing between any two adjacent second grounding structures 62 is the same, that is, the multiple second grounding structures 62 are distributed at equal intervals, which helps to improve the antenna performance of the second antenna 20 .

[0075] Optionally, the smartwatch further comprises a tuning structure, one end of which is connected to the flexible circuit board 80 provided on the inner side of the bottom shell 21, the other end of which is connected to a capacitor or inductor (e.g., the first component 70) on the printed circuit board 30, and the other end of which is connected to the ground of the printed circuit board 30. For example, the tuning structure may be a metal shrapnel. Figure 20 It can be seen that loading capacitors on the flexible circuit board 80 can significantly improve the circular polarization effect of the first antenna. For example, loading a 4.7pF capacitor can significantly improve the axial ratio of the circular polarization, increase the right-hand component, and thus improve the purity of the circular polarization, thereby increasing the first antenna's reception strength for antenna signals (such as GPS signals), and effectively improving the user's positioning experience. Figure 19 This is the polarization analysis of the first antenna. Through the decomposition of the far-field radiation pattern, it can be seen that the right-hand component of the first antenna is significantly higher than the left-hand component, which is right-hand circular polarization.

[0076] Please refer to Figures 24 to 28In the case where the metal frame 10 is a square structure, the metal frame 10 includes a first frame and a second frame arranged opposite to each other, and the first frame and the second frame are frames in the width direction of the metal frame 10. The first frame is provided with a first groove 11 and / or the second frame is provided with a second groove 12. The line connecting the center of the first groove 11 and the center of the second groove 12 is perpendicular to the first frame and the second frame. For example, the first groove 11 is located at the 12 o'clock position of the smart watch, and the second groove 12 is located at the 6 o'clock position of the smart watch.

[0077] For example, the metal frame 10 can be cut away from part of the metal frame 10 relative to the 12 o'clock direction and / or the 6 o'clock direction of the smart watch to form a first groove 11 and / or a second groove 12. This can not only maintain the appearance of the smart watch, but also improve the right-hand circular polarization component of the first antenna as a GPS antenna, thereby enhancing the GPS positioning experience of the smart watch. For example, the first groove 11 is formed by cutting away a part of the metal frame 10 at 12 o'clock. The depth of the first groove 11 is 0.1 to 0.5 mm and the width is 1 mm to 10 mm. Of course, the size of the first groove 11 can be flexibly adjusted according to the structure of the smart watch and the dispensing of electronic components. In this way, the length of the metal frame 10 in the longitudinal direction is longer, and the ratio of the current path in the length direction and the width direction of the metal frame 10 is changed by perturbation, thereby changing the phase difference between the two modes in the length direction and the width direction of the excitation middle frame, thereby optimizing the circular polarization and enhancing the right-hand circular polarization component. Correspondingly, the metal frame 10 at 6 o'clock can be partially cut off to form the second groove 12, or the metal frame 10 at 12 o'clock and 6 o'clock can be partially cut off to form the first groove 11 and the second groove 12, thereby effectively improving the right-handed circular polarization component of the first antenna.

[0078] It should be noted that the formation of the first groove 11 and the second groove 12 does not destroy the integrity of the square structure of the metal frame 10, that is, when including the first groove 11 and the second groove 12, the metal frame 10 is still a complete square structure without any break.

[0079] The present application also provides a control method, which is applied to the smartwatch described in the above embodiment. Figure 30 The control method provided in the embodiment of the present application includes the following steps:

[0080] Step S101: Acquire the current posture of the smart watch.

[0081] Alternatively, the current posture of the smartwatch can be acquired through sensors within the smartwatch, including but not limited to gravity sensors, accelerometers, and angle sensors. For example, the current posture of the smartwatch can be determined by acquiring data from multiple sensors within the smartwatch, such as an accelerometer and a gyroscope. After acquiring the current posture of the smartwatch, the sensor transmits a first signal to the controller, the first signal being used to indicate whether the current posture of the smartwatch is the first posture or the second posture. Based on the first signal, the controller can then control the second end of the switch to connect to the first feed structure or the second feed structure.

[0082] In the embodiment of the present application, the current posture of the smartwatch includes a first posture and a second posture. In the first posture, the smartwatch screen is facing the sky. For example, when a user is wearing the smartwatch and riding, the smartwatch is in the first posture. The second posture is when the smartwatch screen is not facing the sky. For example, when a user is wearing the smartwatch and walking, the user's arm is hanging down, and the smartwatch screen is not facing the sky, but is nearly perpendicular to the sky. In this case, the smartwatch is in the second posture.

[0083] Step S102: When the current posture of the smart watch is the first posture, control the second end of the switching switch to be connected to the first feeding structure; the working antenna of the smart watch is the first antenna, and the antenna radiation pattern of the first antenna is facing the sky.

[0084] It can be understood that when the current posture of the smart watch is the first posture, that is, the smart watch is currently in a state where the watch screen is facing the sky, the second end of the switching switch is electrically connected to one end of the first feeding structure through the controller. The first feeding structure is a feeding structure connected to the first antenna. At this time, the RF module is connected to the first antenna through the switching switch. At this time, the first antenna is the working antenna of the smart watch, and the first antenna can generate an antenna radiation pattern perpendicular to the smart watch screen, that is, the antenna radiation pattern generated by the first antenna is facing the sky, which makes the smart watch have better antenna performance in the first posture.

[0085] Step S103: When the current posture of the smart watch is the second posture, control the second end of the switch to be connected to the second feeding structure; the working antenna of the smart watch is the second antenna, and the antenna pattern of the second antenna is facing the sky.

[0086] It can be understood that when the current posture of the smart watch is the second posture, that is, the smart watch is currently in a state where the watch screen is not facing the sky, for example, the user is wearing the smart watch and is currently walking or running. At this time, the user's arm is in a drooping state, and the screen of the smart watch is not facing the sky, but is close to vertical to the sky. The smart watch can control the second end of the switching switch to be electrically connected to one end of the second feeding structure through the controller, and the second feeding structure is the feeding structure of the second antenna, that is, at this time the RF module is connected to the second antenna through the switching switch, and the second antenna can generate an antenna radiation pattern parallel to the plane where the smart watch screen is located, that is, the antenna radiation pattern generated by the second antenna is also facing the sky, so that the smart watch also has better antenna performance in the second posture.

[0087] The solution provided in the embodiment of the present application can control the switching switch to connect to the first antenna or the second antenna through the controller according to the current posture of the smart watch, so that the smart watch can select the first antenna or the second antenna as the working antenna according to the change of its posture, so that the antenna radiation pattern of the working antenna (first antenna or second antenna) of the smart watch is facing the sky in different postures, thereby effectively ensuring the antenna performance of the working antenna, and effectively ensuring that the smart watch can have good communication performance in different postures.

[0088] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A smart watch, characterized in that: It includes a metal frame, a bottom shell, a printed circuit board, a first feeding structure and a second feeding structure, wherein the metal frame and the bottom shell are connected to form a receiving space, and the printed circuit board is located in the receiving space; The metal frame constitutes a first antenna, a second antenna is provided on the inner or outer side of the bottom shell, the metal frame is connected to the first feeding structure, the second antenna is connected to the second feeding structure, a radio frequency module, a switch, a sensor, and a controller are provided on the printed circuit board, the controller is connected to the sensor and the first end of the switch, and the first end of the switch is also connected to the radio frequency module; In which, the sensor is used to detect the current posture of the smart watch and send a first signal to the controller, the first signal is used to indicate that the current posture of the smart watch is the first posture or the second posture. When the current posture of the smart watch is the first posture, the controller is used to control the second end of the switching switch to be connected to the first feeding structure according to the first signal, the working antenna of the smart watch is the first antenna, and the antenna pattern of the first antenna is facing the sky; when the current posture of the smart watch is the second posture, the controller is used to control the second end of the switching switch to be connected to the second feeding structure according to the first signal, the working antenna of the smart watch is the second antenna, and the antenna pattern of the second antenna is facing the sky.

2. The smartwatch according to claim 1, wherein: The second antenna is any one of the following: a metal sheet embedded in the inner side of the bottom shell; a flexible circuit board attached to the inner side of the bottom shell; A conductor is provided on the outer surface of the bottom shell.

3. The smartwatch according to claim 1 or 2, wherein: It also includes a first grounding structure, one end of which is connected to the metal frame, and the other end of which is grounded.

4. The smartwatch according to claim 3, wherein: A first component is also provided on the printed circuit board. The other end of the first grounding structure is connected to the first component, and the other end of the first component is connected to the ground of the printed circuit board.

5. The smartwatch according to claim 1 or 2, characterized in that: The system further includes at least one second grounding structure, one end of the second grounding structure is connected to the second antenna, and the other end of the second grounding structure is grounded.

6. The smartwatch according to claim 1 or 2, characterized in that: It also includes a tuning structure, and a first component is also provided on the printed circuit board. One end of the tuning structure is connected to the flexible circuit board provided on the inner side of the bottom shell, and the other end of the tuning structure is connected to the first component, and the other end of the first component is connected to the ground of the printed circuit board.

7. The smartwatch according to claim 1 or 2, characterized in that: The metal frame includes a first frame and a second frame arranged opposite to each other, the first frame is provided with a first groove, and / or the second frame is provided with a second groove; Wherein, a line connecting the center of the first groove and the center of the second groove is perpendicular to the first frame and the second frame.

8. The smartwatch according to claim 1 or 2, characterized in that: The first feeding structure is arranged adjacent to the second feeding structure.

9. The smartwatch according to claim 1 or 2, characterized in that: The metal frame is a ring-shaped or square structure, and the perimeter of the metal frame matches the wavelength of the target frequency band.

10. A control method, applied to the smart watch according to any one of claims 1 to 9, characterized in that: The method comprises: Obtaining the current posture of the smartwatch; When the current posture of the smart watch is the first posture, controlling the second end of the switching switch to be connected to the first feeding structure, the working antenna of the smart watch is the first antenna, and the antenna pattern of the first antenna is facing the sky; When the current posture of the smart watch is the second posture, the second end of the control switch is connected to the second feeding structure, the working antenna of the smart watch is the second antenna, and the antenna pattern of the second antenna is facing the sky.

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