Wearable device

Abstract

The embodiment of the invention provides wearable equipment which is used for improving the working efficiency of an antenna structure and improving the connection stability between the wearable equipment and a mobile terminal. The antenna structure provided by the embodiment of the invention comprises a first radiator and a second radiator, wherein a first gap is formed between the first radiator and the second radiator. The first radiator is provided with a feeding point and a first grounding point, the second radiator is provided with a second grounding point, and the first grounding point and the second grounding point are configured to be grounded. The first radiator is used for feeding the second radiator in a coupled manner, so that the second radiator is parasitic on the first radiator, the aperture of the antenna structure is expanded, and the efficiency of the antenna structure is improved. When the wearable device is worn on the head of the user, the second radiator is closer to the user than the first radiator. According to different relative positions of the first grounding point and the second grounding point, the second radiator can parasitize the first radiator in four different modes.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of antenna technology, and in particular, to a wearable device. Background Art

[0002] Wearable devices can be equipped with antenna structures to communicate with the Bluetooth of mobile terminals through the antenna structures, so as to cooperate with the mobile terminals to play music and make calls. However, in the working scenarios of the communication connection between wearable devices and mobile terminals, there are many factors that increase the loss of electromagnetic wave transmission, resulting in a decrease in the connection stability between the wearable device and the mobile terminal, thereby causing the problem of poor communication performance between the wearable device and the mobile terminal. Summary of the invention

[0003] An embodiment of the present application provides a wearable device, which can improve the working efficiency of the antenna structure and improve the connection stability between the wearable device and the mobile terminal.

[0004] In order to achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0005] The wearable device provided in an embodiment of the present application is used to be worn on the head of a user. The wearable device includes a shell and an antenna structure, the shell encloses a cavity, and the antenna structure is arranged in the cavity. Among them, the antenna structure includes: a first radiator and a second radiator, and the first radiator and the second radiator are arranged along a first direction. The first direction is the length direction of the shell. A feeding point and a first grounding point are provided on the first radiator, and a second grounding point is provided on the second radiator, and the first grounding point and the second grounding point are configured to be grounded. There is a first gap between the first radiator and the second radiator. The first radiator is used to couple and feed power to the second radiator. When the wearable device is worn on a user, the second radiator is closer to the user than the first radiator.

[0006] The wearable device provided in the embodiment of the present application has an antenna structure mounted in the internal cavity of the shell, and a first radiator, a first gap, and a second radiator of the antenna structure are sequentially arranged along the length direction of the shell, so that the wearable device can communicate with other devices such as mobile terminals through the antenna structure. A feeding point and a first grounding point are arranged on the first radiator, and a second grounding point is arranged on the second radiator, and the first grounding point and the second grounding point are configured to be grounded. Therefore, the first radiator is the main radiator, the second radiator is the parasitic radiator, and the first radiator is used to couple and feed the second radiator, thereby expanding the aperture of the antenna structure and improving the efficiency of the antenna structure. When the wearable device is worn on the user's head, the second radiator is closer to the user than the first radiator, which can reduce the influence of dielectric loss on the signal transmission of the antenna structure.

[0007] According to the different relative positions of the first grounding point and the second grounding point, the first radiator can couple and feed the second radiator in different ways.

[0008] In some embodiments, the first grounding point is located between the feeding point and the first gap, and the second grounding point is located at an end of the second radiator away from the first gap. In this case, the first grounding point is close to the first gap, and the second grounding point is away from the first gap. Electromagnetic coupling is formed between the first radiator and the second radiator, and the first radiator is coupled and fed to the second radiator in a "back-to-back" manner.

[0009] In some other embodiments, the first grounding point is located between the feeding point and the first gap, and the second grounding point is located at an end of the second radiator close to the first gap. In this case, the first grounding point is close to the first gap, and the second grounding point is close to the first gap. A magnetic field coupling is formed between the first radiator and the second radiator, and the first radiator is coupled and fed to the second radiator in a "back-to-back" manner.

[0010] In some other embodiments, the feeding point is located between the first grounding point and the first gap, and the second grounding point is located at the end of the second radiator away from the first gap. In this case, the first grounding point is far away from the first gap, and the second grounding point is far away from the first gap. Electric field coupling is formed between the first radiator and the second radiator, and the first radiator couples and feeds the second radiator in a "mouth-to-mouth" manner.

[0011] In some other embodiments, the feeding point is located between the first grounding point and the first gap, and the second grounding point is located at an end of the second radiator close to the first gap. In this case, the first grounding point is far away from the first gap, and the second grounding point is close to the first gap. Electromagnetic coupling is formed between the first radiator and the second radiator, and the first radiator couples and feeds the second radiator in a "mouth-to-back" manner.

[0012] In some embodiments, the first radiator includes a first hollow area, and at least part of the first hollow area is located between the feeding point and the first grounding point. At this time, since the first hollow area is located between the feeding point and the first grounding point, the current path between the feeding point and the first grounding point can be increased, so that the first radiator can achieve the same electrical length through a smaller area. In this way, the miniaturization of the antenna structure can be achieved without affecting the function of the antenna structure. This is conducive to achieving a more flexible architectural layout of the wearable device and reducing the volume and weight of the wearable device.

[0013] In a possible implementation, the first hollow area includes a first slit, a second slit and a third slit. The second slit is located between the first slit and the third slit, and the second slit is connected to both the first slit and the third slit. The second slit is located between the feeding point and the first grounding point. The length direction of the first slit and the third slit is parallel to the first direction. In this way, the first slit, the second slit and the third slit can be connected to form a U shape. The first grounding point and the feeding point are separated by the second slit. The current starts from the feeding point and has to bypass the first slit or the third slit to reach the first grounding point, which can effectively increase the current path, thereby achieving the above-mentioned beneficial effects.

[0014] In some embodiments, the first radiator is used to generate a first main resonance, and the second radiator is used to generate a first parasitic resonance. The center frequency of the first main resonance is the first main frequency f01, the center frequency of the first parasitic resonance is the first parasitic frequency f11, and |f01-f11|≤900MHz. In this case, because the first main frequency f01 and the first parasitic frequency f11 are similar in magnitude, the second radiator that generates the first parasitic resonance can play a role in performance auxiliary transmission for the first radiator that generates the first main resonance.

[0015] In other embodiments, the first radiator is used to generate the first main resonance and the second main resonance, and the second radiator is used to generate the first parasitic resonance and the second parasitic resonance. The center frequency of the first main resonance is the first main frequency f01, the center frequency of the second main resonance is the second main frequency f02, the center frequency of the first parasitic resonance is the first parasitic frequency f11, the center frequency of the second parasitic resonance is the second parasitic frequency f12, |f01-f11|≤900MHz, |f02-f12|≤900MHz. In this case, because the first main frequency f01 and the first parasitic frequency f11 are similar in size, and because the second main frequency f02 and the second parasitic frequency f12 are similar in size, the second radiator can play a role in assisting the first radiator in performance transmission in both the frequency band where the first main resonance is located and the frequency band where the second main resonance is located.

[0016] In a possible implementation manner, the first radiator body generates a first main resonance, and the first hollow area generates a second main resonance.

[0017] In another possible implementation, the first radiator body generates a first main resonance and a second main resonance, wherein the first main resonance is a fundamental mode of the first radiator, and the second main resonance is a higher-order mode of the first radiator.

[0018] In a possible implementation manner, the second radiator includes a second hollow region. The second radiator body generates a first parasitic resonance, and the second hollow region generates a second parasitic resonance.

[0019] In another possible implementation, the second radiator body generates a first parasitic resonance and a second parasitic resonance. The first parasitic resonance is a fundamental mode of the second radiator, and the second parasitic resonance is a higher-order mode of the second radiator.

[0020] In some embodiments, the resonant frequency band of the first main resonance includes 2.4 GHz-2.485 GHz, the physical length of the first radiator is 12 mm-32 mm, the physical length of the second radiator is 12 mm-24 mm, and the physical length of the first gap is 0.5 mm-3.5 mm. In this way, when the first radiator is used to couple and feed the second radiator, it is easy for the second radiator to play a performance-assisted transmission role on the first radiator, thereby improving the efficiency of the antenna structure.

[0021] In some embodiments, the electrical length of the first radiator is 0.1λ-0.25λ, the electrical length of the second radiator is 0.1λ-0.2λ, and the electrical length of the first slot is 0.004-0.03λ, where λ is the operating wavelength corresponding to the first main frequency f01.

[0022] In some embodiments, the wearable device further includes a fixing portion. One end of the fixing portion is connected to the first end of the shell, and the first end, the first radiator, the first gap, and the second radiator are arranged in sequence along a first direction. The first direction is the length direction of the shell, the second direction is the width direction of the shell, and the third direction is perpendicular to the first direction and the second direction. In this way, the wearable device can be worn on the user's head through the fixing portion. In some examples, the wearable device is a pair of smart glasses, and the fixing portion can be a frame of the smart glasses. In some examples, the wearable device can be a headset,

[0023] In some embodiments, the wearable device includes a Bluetooth headset. The Bluetooth headset is used to be worn on the user's ear. The fixing portion is used to hang on the user's ear. In this way, the fixing portion can fix the shell to the user's ear through the first end, the first radiator is close to the fixing portion and away from the auricle, and the second radiator is away from the fixing portion and close to the auricle. At this time, the electric field component of the antenna structure parallel to the first direction is reduced, and the electric field component of the antenna structure parallel to the third direction is increased, which can reduce the loss of the signal emitted by the antenna structure during propagation. In this way, the transmission performance of the antenna structure can be improved in the specific application scenario where the wearable device is fixed on the user's ear through the fixing portion.

[0024] In one possible implementation, the fixing portion is in a "C" shape or a "U" shape, and the other end of the fixing portion is spaced from the shell. In this way, the spacing between the other end of the fixing portion and the shell can make the fixing portion fit the user's ear, and the wearable device can be more firmly fixed to the user's ear. One end of the fixing portion is connected to the first end, so that when the wearable device is worn on the user's head, the second radiator is closer to the user relative to the first radiator, thereby reducing the influence of the auricle on the signal transmission of the antenna structure. In some embodiments, the first radiator and the second radiator are attached to the inner wall of the cavity. In this way, the space occupied by the antenna structure in the shell can be reduced, which is conducive to realizing a more flexible architectural layout of the wearable device and is conducive to reducing the volume and weight of the wearable device.

[0025] In a possible implementation, a first bracket and a second bracket are provided in the cavity, the first radiator is connected to the first bracket, and the second radiator is connected to the second bracket. In this way, the first radiator can be attached to the inner wall of the cavity through the first bracket, and the second radiator can be attached to the inner wall of the cavity through the second bracket. This makes it more convenient to replace and assemble the antenna structure.

[0026] In another possible implementation, the first radiator and the second radiator are both arranged on the inner surface of the shell. In this way, the first radiator and the second radiator are arranged on the inner surface of the shell to be attached to the inner wall of the cavity. The number of components in the wearable device can be reduced, which is conducive to reducing the volume and weight of the wearable device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a wearable device provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of an interaction of a wearable device provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of a signal transmission path of a wearable device provided in an embodiment of the present application;

[0030] Figure 4A A schematic diagram of the structure of a wearable device provided in an embodiment of the present application;

[0031] Figure 4B A schematic diagram of wearing a wearable device provided in an embodiment of the present application;

[0032] Figure 4C For Figure 4B Simulation diagram of the electric field distribution of the antenna structure under the wearing mode;

[0033] Figure 5 A schematic diagram of an antenna structure provided in an embodiment of the present application;

[0034] Figure 6 for Figure 5 Simulation diagram of electric field distribution of the antenna structure;

[0035] Figure 7 for Figure 5 Simulation results of the power loss per unit volume of the antenna structure;

[0036] Figure 8 for Figure 5 Simulation results of the radiation efficiency of the antenna structure in Figure 2;

[0037] Fig. 9 A schematic diagram of an antenna structure provided in an embodiment of the present application;

[0038] Fig.10 for Fig. 9 Simulation diagram of electric field distribution of the antenna structure;

[0039] Fig.11 for Fig. 9 Simulation results of the power loss per unit volume of the antenna structure;

[0040] Fig.12 for Fig. 9 Simulation results of the radiation efficiency of the antenna structure in Figure 2;

[0041] Fig.13 A schematic diagram of an antenna structure provided in an embodiment of the present application;

[0042] Fig.14 for Fig.13 Simulation diagram of electric field distribution of the antenna structure;

[0043] Fig.15 for Fig.13 Simulation results of the power loss per unit volume of the antenna structure;

[0044] Fig.16 for Fig.13 Simulation results of the radiation efficiency of the antenna structure in Figure 2;

[0045] Fig.17 A schematic diagram of another antenna structure provided in an embodiment of the present application;

[0046] Fig.18 A schematic diagram of another antenna structure provided in an embodiment of the present application;

[0047] Fig.19 A schematic diagram of another antenna structure provided in an embodiment of the present application;

[0048] Fig. 20A schematic diagram of another antenna structure provided in an embodiment of the present application;

[0049] Fig.21 A schematic diagram of another antenna structure provided in an embodiment of the present application;

[0050] Fig. 22 for Figure 5 , Fig.18 , Fig. 20 and Fig.21 Simulation results of the radiation efficiency of the antenna structure;

[0051] Fig.23 for Figure 5 , Fig. 9 , Fig.13 Simulation diagram of current distribution in the antenna structure;

[0052] Fig.24 A schematic diagram of the structure of another wearable device provided in an embodiment of the present application;

[0053] Fig.25 A schematic diagram of the structure of another wearable device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0055] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0056] The limitations such as collinearity, symmetry (for example, axisymmetry, or center symmetry, etc.), parallelism, verticality, orthogonality, and the same (for example, the same length, the same width, etc.) mentioned in the embodiments of the present application are all for the current technological level, rather than an absolutely strict definition in a mathematical sense. The collinearity of three elements can be understood as a line connecting two elements or their extended lines intersecting with another element, or the closest distance to another element is about 2 mm. In one embodiment, the collinear elements may include, for example, structural members that realize a "feeding terminal" or a "grounding terminal", such as a protruding structure, a spring foot, a spring sheet, etc. on the inner surface of a conductive frame. There may be a deviation of a predetermined angle between two components that are parallel or perpendicular to each other. In one embodiment, the predetermined threshold may be less than or equal to a threshold of 1 mm, for example, the predetermined threshold may be 0.5 mm, or may be 0.1 mm. In one embodiment, the predetermined angle may be an angle within a range of ±10°, for example, the predetermined angle deviation is ±5°.

[0057] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed mechanical connection, a detachable mechanical connection, or an integrated one; or, "connection" can be a direct connection or an indirect connection through an intermediate medium.

[0058] In addition, unless otherwise clearly specified and limited, the term "coupling" should be understood in a broad sense. For example, "coupling" can be a direct electrical connection, such as physical contact and electrical conduction between two components. It can also be understood as the electrical connection between different components in the circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals to transmit electrical signals; or, "coupling" can be an indirect electrical connection between two components through an intermediate medium; or, "coupling" can be an electrical connection between two components in an air / non-contact manner, for example, two components are electrically connected by capacitive coupling to transmit electrical signals.

[0059] In the embodiments of the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and may change accordingly according to the changes in the orientation of the components in the drawings.

[0060] In the drawings of the embodiments of the present application, components are indicated by guide lines with arrows; parts are indicated by guide lines only.

[0061] The technical solution provided in the embodiment of the present application is applicable to electronic devices using one or more of the following communication technologies, and the above communication protocols may include: Bluetooth (blue-tooth, BT) communication technology, global positioning system (global positioning system, GPS) communication technology, global system of mobile communication (global system of mobile communication, GSM) communication technology, wireless fidelity (wireless fidelity, WiFi) communication technology, wideband code division multiple access (wideband code division multiple access wireless, WCDMA) communication technology, long term evolution (long term evolution, LTE), 5G communication technology and other future communication technologies. The electronic device in the embodiment of the present application may be (mobile phone), tablet computer (pad), notebook computer, smart home, wearable device, virtual reality (virtual reality, VR) electronic device, augmented reality (augmented reality, AR) electronic device, etc. The electronic device may also be a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, an electronic device in a 5G network or an electronic device in a public land mobile communication network (publicland mobile network, PLMN) in the future evolution, etc., and the embodiment of the present application is not limited to this. For the convenience of explanation, the electronic device is a wearable device as an example for explanation.

[0062] The embodiments of the present application do not limit the type of wearable device. The wearable device may be a watch, a bracelet, an earphone, an ear hook, an ear clip, smart glasses, a smart helmet, etc. For the convenience of explanation, the following example is taken as an example that the wearable device is a wireless earphone. The embodiments of the present application do not limit the form of the wireless earphone. The wireless earphone may be an in-ear earphone, an ear hook earphone, an ear clip earphone, etc. For the convenience of explanation, the following example is taken as an example that the wearable device is a wireless earphone. Figure 1 The wearable device 100 shown is an example of an ear-hook type headset.

[0063] like Figure 1 As shown, the wearable device 100 includes: a housing 1, a fixing part 2, an antenna structure 3, a signal processing module 4 and a speaker 5. The fixing part 2 is used to fix the ear hook on the user's ear. The antenna structure 3 is used to receive a modulated signal from a mobile terminal. The signal processing module 4 is used to process the modulated signal into an audio waveform signal. The speaker 5 is used to output the audio waveform signal as sound. It should be understood that Figure 1The structures of the wearable device 100 shown are only some examples. The wearable device 100 may also have other different embodiments. Figure 1 The wearable device 100 shown is used as an example for detailed description.

[0064] In an embodiment of the present application, the user's ear may include an auricle and an external auditory canal. The auricle is an external structure composed of cartilage and skin that helps collect sound and guide it to the external auditory canal. The external auditory canal is a tube extending from the auricle to the eardrum, which plays a role in conducting sound. The user's ear can be used to fix the wearable device 100, and can also be used to conduct the sound emitted by the speaker 5.

[0065] In the wearable device 100 provided in the embodiment of the present application, the housing 1 can be made of metal, plastic or ceramic. Specifically, the metal material can be, for example, aluminum alloy, stainless steel, etc., and the plastic material can be, for example, ABS resin, polycarbonate (PC), etc. Further, the antenna structure 3, the signal processing module 4 and the speaker 5 are all arranged inside the housing 1, and the antenna structure 3 and the speaker 5 are respectively connected to the signal processing module 4. Specifically, the antenna structure 3, the speaker 5 and the signal processing module 4 are arranged on one or more printed circuit boards, and the connection is achieved through the printed circuit or wiring on the printed circuit board.

[0066] The fixing part 2 can adopt a three-point support structure, fit the structure of the user's ear, and be stably hung on the user's ear. In one possible implementation, the connection between one end of the fixing part 2 and the shell 1 is a detachable connection (such as a snap-on connection, a threaded connection, etc.) to facilitate subsequent repair (or maintenance) of the wearable device 100. In another possible implementation, the connection between one end of the fixing part 2 and the shell 1 can also be a non-detachable connection (such as a glue connection) to reduce the risk of accidental detachment of the fixing part 2, which is beneficial to improving the reliability of the wearable device 100.

[0067] The antenna structure 3 can be arranged on the inner wall of the housing 1 using laser direct structuring (LDS) and flexible printed circuit (FPC) technology. When the housing 1 is made of metal, the housing 1 will also serve as a part of the antenna structure 3. In some embodiments, Figure 2 As shown, the antenna structure 3 can use Bluetooth communication technology. The wearable device 100 is connected to the mobile terminal 200 via Bluetooth and receives the data signal sent by the mobile terminal 200. The embodiment of the present application does not limit the communication technology used by the antenna structure 3. For the convenience of explanation, the antenna structure 3 can use Bluetooth communication technology as an example.

[0068] The signal processing module 4 can be a system on a chip (SoC) with integrated demodulation, channel decoding, audio decoding, and audio amplification functions. The system chip can process the modulated signal received from the mobile terminal connected to the wearable device 100 based on hardware or based on hardware and corresponding software programs, and convert the modulated signal in digital format into an audio waveform signal in analog format through steps such as demodulation, channel coding, audio decoding, and audio amplification. On the other hand, the signal processing module 4 can also be composed of multiple functionally independent chips, which are arranged on a printed circuit board and respectively perform steps such as demodulation, channel coding, audio decoding, and audio amplification to achieve the same functions as the system chip. In addition, the signal processing module 4 can also have functions such as digital coding, channel coding, and modulation at the same time.

[0069] The speaker 5 may include, for example, a dynamic speaker, a moving iron speaker, a dynamic iron hybrid speaker, and a bone conduction speaker. If the wireless headset is designed to be in-ear, the speaker 5 is arranged in the sound cavity of the in-ear wireless headset; if the wireless headset is designed to be in-ear, the speaker 5 is arranged in the housing 1 of the wireless headset. In some embodiments, the housing 1 may also include one or more sound outlet holes, so that the sound emitted by the speaker 5 can be transmitted to the outside of the housing 1 through the sound outlet holes. The embodiments of the present application do not limit the shape, position, number, etc. of the sound outlet holes. In other embodiments, when the wireless headset uses a bone conduction speaker, the housing 1 may not be provided with an opening for outputting sound.

[0070] In some embodiments, Figure 3 As shown, a common usage scenario of the wearable device 100 is that the user wears headphones on both ears, while the mobile terminal 200 is in the user's trouser pocket or hand. The wearable device 100 is, for example, a Bluetooth headset, and the mobile terminal 200 is, for example, a mobile phone. The Bluetooth communication link between the wearable device 100 and the mobile terminal 200 suffers from great loss due to the influence of the medium. In addition, when the user is in a complex environment (for example, a station, a shopping mall, etc.), if there is an interference signal (for example, a hotspot signal, a WiFi signal, or a Bluetooth signal of another device) with the same frequency as the Bluetooth frequency band (2.4GHz-2.485GHz), the connection between the wearable device 100 and the mobile terminal 200 is easily affected by the interference signal, resulting in a decrease in the signal-to-noise ratio, which results in poor communication quality of the Bluetooth communication link, and the wearable device 100 becomes stuck or even disconnected, affecting the user experience.

[0071] An embodiment of the present application provides a wearable device, which includes an antenna structure. By improving the working efficiency of the antenna structure, the connection stability between the wearable device and the mobile terminal is improved, and the communication quality of the Bluetooth communication link of the wearable device is improved.

[0072] In some embodiments, Figure 4A As shown, the wearable device 100 is, for example, a Bluetooth headset. The wearable device 100 includes a shell 1 and an antenna structure 3. The shell 1 forms a cavity, and the antenna structure 3 is arranged in the cavity. The antenna structure 3 includes: a first radiator 31 and a second radiator 32. The first radiator 31 and the second radiator 32 are arranged along the length direction of the shell. A feeding point F and a first grounding point G1 are arranged on the first radiator 31, and a second grounding point G2 is arranged on the second radiator 32. The first grounding point G1 and the second grounding point G2 are configured to be grounded. There is a first gap D between the first radiator 31 and the second radiator 32. The first radiator 31 is used to couple and feed the second radiator 32. As shown Figure 4B As shown, when the wearable device 100 is worn on the user's head, the first radiator 31 is located on the side of the wearable device 100 away from the auricle, and the second radiator 32 is located on the side of the wearable device 100 close to the auricle. The second radiator 32 is closer to the user than the first radiator 31.

[0073] For the convenience of explanation, Figure 4A The xyz coordinate system is established in the figure. The length direction of the shell is the first direction x, the width direction of the shell is the second direction y, and the height direction of the shell is the third direction z. The third direction z is perpendicular to the first direction x and the second direction y. The coordinate system definitions in the subsequent figures are similar and will not be repeated.

[0074] The wearable device 100 provided in the embodiment of the present application has an antenna structure 2 mounted in the internal cavity of the shell 1, and a first radiator 31, a first gap D, and a second radiator 32 of the antenna structure 3 are sequentially arranged along the length direction (first direction x) of the shell 1, so that the wearable device 100 can communicate with other devices such as mobile terminals through the antenna structure 3. A feeding point F and a first grounding point G1 are arranged on the first radiator 31, and a second grounding point G2 is arranged on the second radiator 32, and the first grounding point G1 and the second grounding point G2 are configured to be grounded. Therefore, the first radiator 31 is the main radiator, and the second radiator 32 is a parasitic radiator. The first radiator 31 is used to couple and feed the second radiator 32, thereby expanding the aperture of the antenna structure 3 and improving the efficiency of the antenna structure 3. When the wearable device 100 is worn on the user's head, the second radiator 32 is closer to the user than the first radiator 31, which can reduce the influence of dielectric loss on the signal transmission of the antenna structure.

[0075] Among them, ground (GND), or floor, can refer to at least a part of any grounding layer, grounding plate, or grounding metal layer in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, grounding plates, or grounding components, etc., and "ground" can be used for grounding components in electronic devices. In one embodiment, "ground" can be a grounding layer of a circuit board of an electronic device, or a grounding plate formed by a frame of an electronic device or a grounding metal layer formed by a metal film under a screen. In one embodiment, the circuit board can be a PCB, such as an 8-layer, 10-layer, or 12 to 14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a routing layer, and the routing layer and the grounding layer are electrically connected through vias. In one embodiment, components such as a display, a touch screen, input buttons, a transmitter, a processor, a memory, a battery, a charging circuit, a system chip structure, etc. can be mounted on or connected to a circuit board; or electrically connected to a wiring layer and / or a ground layer in the circuit board. For example, a radio frequency source is disposed in the wiring layer.

[0076] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material can be any of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. It will be appreciated by those skilled in the art that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0077] Grounding means coupling with the ground / floor in any way. In one embodiment, grounding can be achieved through physical grounding, such as physical grounding (or physical ground) at a specific position on the frame through some structural parts of the middle frame. In one embodiment, grounding can be achieved through device grounding, such as grounding through devices such as capacitors / inductors / resistors connected in series or in parallel (or device ground).

[0078] The embodiments of the present application do not limit the positions of the feeding point F, the first grounding point G1 on the first radiator 31, and the second grounding point G2 on the second radiator 32. For example, the feeding point F and the first grounding point G1 are on a straight line. For example, the feeding point F and the second grounding point G2 are on a straight line. For example, the feeding point F, the first grounding point G1, and the second grounding point G2 are all on a straight line. For the convenience of explanation, the feeding point F, the first grounding point G1, and the second grounding point G2 are all on a straight line, and the straight line is the central axis of the antenna structure 3 along the y direction.

[0079] In some embodiments, Figure 4A As shown, the first radiator 31 and the second radiator 32 are attached to the inner wall of the cavity surrounded by the shell 1. In this way, the space occupied by the antenna structure 3 in the shell can be reduced, which is conducive to realizing a more flexible architecture layout of the wearable device 100 and is conducive to reducing the volume and weight of the wearable device 100.

[0080] In a possible implementation, a first bracket and a second bracket are provided in the cavity, the first radiator 31 is connected to the first bracket, and the second radiator 32 is connected to the second bracket. In this way, the first radiator 31 can be attached to the inner wall of the cavity through the first bracket, and the second radiator 32 can be attached to the inner wall of the cavity through the second bracket. It is more convenient to replace and assemble the antenna structure 3. Based on this, the wearable device 100 may also include a touch flexible printed circuit (touch FPC). The touch FPC is provided between the first bracket and the second bracket and contacts the shell 1. By tapping the shell 1, the touch FPC can be controlled to realize the extended function of the wearable device 100.

[0081] In another possible implementation, the first radiator 31 and the second radiator 32 are both arranged on the inner surface of the housing 1. For example, the housing includes a cover plate, and the first radiator 31 and the second radiator 32 are both arranged on a side surface of the cover plate close to the cavity. In this way, the first radiator 31 and the second radiator 32 are arranged on the inner surface of the housing 1 to be attached to the inner wall of the cavity. The number of components in the wearable device 100 can be reduced, which is conducive to reducing the volume and weight of the wearable device 100.

[0082] In some embodiments, Figure 4BAs shown, one end of the fixing part 2 of the wearable device 100 is connected to the first end 11 of the shell 1, and the first end 11, the first radiator 31, the first gap D and the second radiator 32 are arranged in sequence along the first direction x. In this way, the fixing part 2 can fix the shell 1 to the user's ear through the first end 11, for example, the fixing part 2 is hung on the user's ear. The first radiator 31 is close to the fixing part 2 and away from the auricle, and the second radiator 32 is away from the fixing part 2 and close to the auricle. At this time, the electric field component of the antenna structure 3 parallel to the first direction x is reduced, and the electric field component of the antenna structure 3 parallel to the third direction z is increased, which can reduce the loss of the signal emitted by the antenna structure 3 during propagation. In this way, the transmission performance of the antenna structure 3 can be improved in the specific application scenario where the wearable device 100 is fixed on the user's ear through the fixing part.

[0083] When the electric field of the antenna structure 3 is parallel to the first direction x or the second direction y, it is greatly affected by the environment, the corresponding transmission coefficient S21 is small, and the link transmission performance of the antenna structure 3 is poor. When the electric field of the antenna structure 3 is parallel to the third direction z, it is less affected by the environment, has a better transmission coefficient S21, and the link transmission performance of the antenna structure 3 is good.

[0084] Among them, the transmission coefficient S21 is a physical quantity used to measure the degree of mutual coupling between antennas. S21 refers to the ratio of the signal received by one antenna through another antenna to the signal of the transmitting antenna. Assuming that the two antennas form a two-port network, the isolation between the two antennas is S21 and S12 between the antennas. The S21 and S12 parameters can represent both the isolation of the antenna and the transmission coefficient between the antennas. The S21 and S12 parameters are usually negative numbers. The smaller the S21 and S12 parameters are, the greater the isolation between the antennas, the smaller the mutual coupling between the antennas, and the worse the transmission performance; the larger the S21 and S12 parameters are, the smaller the isolation between the antennas, the greater the mutual coupling between the antennas, and the better the transmission performance.

[0085] based on Figure 4B The electric field distribution of the wearable device 100 is simulated according to the wearing method. The simulation results are as follows: Figure 4C As shown. Among them, Figure 4C for Figure 4B In the cross-sectional view on the xz plane, the arrow points to the direction of the electric field in the region. Figure 4B and Figure 4C It can be found that a vortex electric field appears at the first gap D, and the energy is concentrated at the first gap D. With the first gap as the boundary, the first radiator 31 is close to the fixing part 2 and away from the auricle; the second radiator 32 is away from the fixing part 2 and close to the auricle. The electric field strength of the area close to the auricle is smaller than the electric field strength of the area far from the auricle, which can reduce the influence of the medium (here, for example, the auricle) on the signal transmission of the antenna structure 3, thereby improving the efficiency of the antenna structure 3.

[0086] In one possible implementation, Figure 4A As shown, the fixing portion 2 includes a first portion 2A and a second portion 2B connected to each other. The first portion 2A includes a second end 21 and a third end 22 relative to each other, and the second portion 2B includes a fourth end 23 and a fifth end 24 relative to each other. The second end 21 is connected to the first end 11, and the third end 22 is connected to the fourth end 23. There is a gap between the second end 21 and the shell 1. In this way, the gap between the second end 21 and the shell 1 can fit the user's ear, so that the wearable device 100 is more firmly fixed on the user's ear. The connection between the second end 21 and the first end 11 can make the second radiator 32 closer to the user relative to the first radiator 31 when the wearable device 100 is worn on the user's head, thereby reducing the influence of the auricle on the signal transmission of the antenna structure 3.

[0087] In some examples, the fixing portion 2 is a flexible material, such as a flexible titanium wire or a flexible titanium alloy. The flexible material fits the user's ear better and provides a stable clamping force, which facilitates the fixing portion 2 to be clamped on the user's ear, so that the wearable device 100 will not fall during running, jumping, and other sports. In some examples, the flexible material is wrapped in liquid silicone. Silicone can increase friction, so that the wearable device 100 can be used in scenarios where the friction of the user's ear is reduced, such as sweating. In some examples, the first part 2A and the second part 2B are connected as a whole, and there is no obvious wiring between the third end 22 and the fourth end 23.

[0088] In some examples, the fixing portion is in a "C" shape, and one end of the C shape is the second end 21. In other examples, the fixing portion is in a "U" shape, and one end of the U shape is the second end 21. It is understandable that in order to adapt to the contour of the back of the ear and fit firmly with the back of the ear, the length and curvature of the first part 2A and the second part 2B in the embodiment of the present application may be the same or different. In order to further verify the efficiency of the antenna structure 3, according to the different relative positions of the first grounding point G1 and the second grounding point G2, the first radiator 31 can couple 32 signals to the second radiator in different ways to achieve four different parasitic modes of the antenna structure 3.

[0089] In some embodiments, Figure 5 As shown, the first grounding point G1 is located between the feeding point F and the first gap D, and the second grounding point G2 is located at the end of the second radiator 32 away from the first gap D. At this time, the first grounding point G1 is close to the first gap D, and the second grounding point G2 is far away from the first gap D. Electromagnetic coupling is formed between the first radiator 31 and the second radiator 32, and the first radiator 31 is coupled and fed to the second radiator 32 in a "back-to-mouth" manner.

[0090] Among them, "back" means that one end of the radiator (such as the first radiator) close to the adjacent radiator (such as the second radiator) is grounded, and "mouth" means that one end of the radiator (such as the second radiator) close to the adjacent radiator (such as the first radiator) is open. Based on this, "back to mouth" means that one end of the first radiator close to the second radiator is grounded (also called "grounded end"), and one end of the second radiator close to the first radiator is open (also called "open end"). "Back to back" means that one end of the first radiator close to the second radiator is grounded, and one end of the second radiator close to the first radiator is grounded. "Mouth to mouth" means that one end of the first radiator close to the second radiator is open, and one end of the second radiator close to the first radiator is open.

[0091] "End" cannot be narrowly understood as a point, but can also be considered as a section of the radiator on the antenna radiator including a first endpoint, where the first endpoint is the endpoint of the antenna radiator at the first gap. For example, the first end of the antenna radiator can be considered as a section of the radiator within a first wavelength range of one sixteenth of the first endpoint, wherein the first wavelength can be a wavelength corresponding to the working frequency band of the antenna structure, a wavelength corresponding to the center frequency of the working frequency band, or a wavelength corresponding to the resonance point. In one embodiment, the open end can also be referred to as an open end or an open circuit end. In one embodiment, the closed end can also be referred to as a ground end or a short circuit end.

[0092] Based on this, the electrical performance of the antenna structure 3 is simulated, and the electric field distribution is as follows: Figure 6 As shown, the power loss per unit volume is Figure 7 As shown, the antenna radiation efficiency is Figure 8 As shown, the link transmission performance S21 and signal-to-noise ratio SNR are shown in Table 1.

[0093] Among them, the power loss per unit volume refers to the power loss of the antenna within the unit volume, which may include dielectric loss. Dielectric loss means that the medium in the antenna transmission path absorbs part of the electromagnetic wave energy, resulting in loss. This loss is related to physical properties such as the dielectric constant of the medium. Since there are a variety of media with different dielectric constants in the signal transmission path of the wearable device, in the simulation of the power loss per unit volume in the embodiment of the present application, the dielectric constant of the medium can be 1-70 farads / meter. For example, the dielectric constant of the medium is 1, and the medium is air. For example, the dielectric constant of the medium is 2.2-3.5, and the medium is a common plastic. For example, the dielectric constant of the medium is 40-65.

[0094] The signal-to-interference plus noise ratio (SNR) refers to the ratio of the strength of the received useful signal to the strength of the received interference signal (noise and interference). The signal-to-noise ratio is a major technical indicator for measuring the reliability of the communication quality of a communication system. The higher the signal-to-noise ratio, the better the communication quality.

[0095] like Figure 6 As shown, Figure 6 To adopt Figure 4B The cross-sectional view on the xz plane when wearing in the middle position, the arrow points to the direction of the electric field in this area. Figure 6 As shown in (A), it is the electric field distribution when the antenna structure 3 has only the first radiator 31. Figure 6 (B) in the figure shows the electric field distribution when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Comparing the electric field components of the second radiator 32 with back-to-back parasitic structure before and after loading, the electric field components of the X2 region parallel to the third direction z are significantly greater than those of the X1 region parallel to the third direction z.

[0096] like Figure 7 As shown, curve ① is the power loss per unit volume when the antenna structure 3 has only the first radiator 31, and curve ② is the power loss per unit volume when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Compared with the "back-to-mouth" parasitic second radiator 32 before and after loading, the power loss per unit volume is reduced by 1.3dB.

[0097] like Figure 8 As shown, curve ① is the radiation efficiency when the antenna structure 3 has only the first radiator 31, and curve ② is the radiation efficiency when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Compared with the "back-to-mouth" parasitic second radiator 32 before and after loading, the radiation efficiency is improved by 0.9dB.

[0098] As shown in Table 1, the wearable device 100 is worn on the left ear, and the mobile terminal 200 is placed in the left pocket (same-side pocket) and the right pocket (opposite-side pocket) to simulate the signal-to-noise ratio SNR and link transmission coefficient S21 of the antenna structure 3. By comparison, after loading the "back-to-mouth" parasitic, the antenna efficiency is improved by 1dB, the transmission performance of the same-side pocket S21 is improved by 5dB, the transmission performance of the opposite-side pocket S21 is improved by 5.8dB, the SNR of the same-side pocket is improved by 4.1dB, and the transmission performance of the opposite-side pocket S21 is improved by 4.8dB.

[0099] Table 1 Comparison of antenna performance before and after back-to-back parasitic loading

[0100]

[0101]

[0102] In summary, the first radiator 31 couples and feeds the second radiator 32 in a “back-to-back” manner, which can significantly improve the efficiency of the antenna structure.

[0103] In other embodiments, Fig. 9 As shown, the first grounding point G1 is located between the feeding point F and the first gap D, and the second grounding point G2 is located at one end of the second radiator 32 close to the first gap D. At this time, the first grounding point G1 is close to the first gap D, and the second grounding point G2 is close to the first gap D. A magnetic field coupling is formed between the first radiator 31 and the second radiator 32, and the first radiator 31 is coupled and fed to the second radiator 32 in a "back-to-back" manner.

[0104] Based on this, the electrical performance of the antenna structure 3 is simulated, and the electric field distribution is as follows: Fig.10 As shown, the power loss per unit volume is Fig.11 As shown, the antenna radiation efficiency is Fig.12 As shown, the link transmission performance S21 and signal-to-noise ratio SNR are shown in Table 2.

[0105] like Fig.10 As shown, Fig.10 To adopt Figure 4B The cross-sectional view on the xz plane when wearing in the middle position, the arrow points to the direction of the electric field in this area. Fig.10 As shown in (A), it is the electric field distribution when the antenna structure 3 has only the first radiator 31. Fig.10 (B) in the figure shows the electric field distribution when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Comparing the "back-to-back" parasitic second radiator 32 before and after loading, the electric field component parallel to the third direction z in the X2 region is significantly greater than the electric field component parallel to the third direction z in the X1 region.

[0106] like Fig.11 As shown, curve ① is the power loss per unit volume when the antenna structure 3 has only the first radiator 31, and curve ② is the power loss per unit volume when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Compared with the "back-to-back" parasitic second radiator 32 before and after loading, the power loss per unit volume is reduced by 1.2dB.

[0107] like Fig.12 As shown, curve ① is the radiation efficiency when the antenna structure 3 has only the first radiator 31, and curve ② is the radiation efficiency when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Comparing the "back-to-back" parasitic second radiator 32 before and after loading, the radiation efficiency is improved by 0.9dB.

[0108] As shown in Table 2, the wearable device 100 is worn on the left ear, and the mobile terminal 200 is placed in the left pocket (same-side pocket) and the right pocket (opposite-side pocket) to simulate the signal-to-noise ratio SNR and link transmission coefficient S21 of the antenna structure 3. By comparison, after loading the "back-to-back" parasitic, the antenna efficiency is improved by 0.9dB, the transmission performance of the same-side pocket S21 is improved by 4.5dB, the transmission performance of the opposite-side pocket S21 is improved by 5.2dB, the SNR of the same-side pocket is improved by 3.6dB, and the transmission performance of the opposite-side pocket S21 is improved by 4.3dB.

[0109] Table 2 Comparison of antenna performance before and after back-to-back parasitic loading

[0110] Before parasitic loading (first radiator only) After parasitic loading (first radiator + second radiator) Antenna efficiency -6.9 -6 Same side pocket SNR -66.5 -62.9 Same side pocket S21 -73.4 -68.9 Opposite pocket SNR -70.7 -66.4 Side pocket S21 -77.6 -72.4

[0111] In summary, the first radiator 31 couples and feeds the second radiator 32 in a “back-to-back” manner, which can significantly improve the efficiency of the antenna structure.

[0112] In other embodiments, Fig.13 As shown, the feeding point F is located between the first grounding point G1 and the first gap D, and the second grounding point G2 is located at the end of the second radiator 32 away from the first gap D. At this time, the first grounding point G1 is far away from the first gap D, and the second grounding point G2 is far away from the first gap D. Electric field coupling is formed between the first radiator 31 and the second radiator 32, and the first radiator 31 couples and feeds the second radiator 32 in a "mouth-to-mouth" manner.

[0113] Based on this, the electrical performance of the antenna structure 3 is simulated, and the electric field distribution is as follows: Fig.14 As shown, the power loss per unit volume is Fig.15 As shown, the antenna radiation efficiency is Fig.16 As shown, the link transmission performance S21 and signal-to-noise ratio SNR are shown in Table 3.

[0114] like Fig.14 As shown, Fig.14 To adopt Figure 4B The cross-sectional view on the xz plane when wearing in the middle position, the arrow points to the direction of the electric field in this area. Fig.14 As shown in (A), it is the electric field distribution when the antenna structure 3 has only the first radiator 31. Fig.14 (B) in the figure shows the electric field distribution when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Comparing the electric field components of the second radiator 32 before and after the "mouth-to-mouth" parasitic loading, the electric field components of the X2 region parallel to the third direction z are significantly greater than the electric field components of the X1 region parallel to the third direction z.

[0115] like Fig.15As shown, curve ① is the power loss per unit volume when the antenna structure 3 has only the first radiator 31, and curve ② is the power loss per unit volume when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Compared with the "mouth-to-mouth" parasitic second radiator 32 before and after loading, the power loss per unit volume is reduced by 0.9dB.

[0116] like Fig.16 As shown, curve ① is the radiation efficiency when the antenna structure 3 has only the first radiator 31, and curve ② is the radiation efficiency when the first radiator 31 and the second radiator 32 in the antenna structure 3 work simultaneously. Compared with the "mouth-to-mouth" parasitic second radiator 32 before and after loading, the radiation efficiency is improved by 1dB.

[0117] As shown in Table 3, the wearable device 100 is worn on the left ear, and the mobile terminal 200 is placed in the left pocket (same-side pocket) and the right pocket (opposite-side pocket) to simulate the signal-to-noise ratio SNR and link transmission coefficient S21 of the antenna structure 3. By comparison, after loading the "mouth-to-mouth" parasitic, the antenna efficiency is improved by 0.9dB, the transmission performance of the same-side pocket S21 is improved by 4.3dB, the transmission performance of the opposite-side pocket S21 is improved by 5.5dB, the SNR of the same-side pocket is improved by 3.6dB, and the transmission performance of the opposite-side pocket S21 is improved by 4.3dB.

[0118] Table 3 Antenna performance comparison before and after port-to-port parasitic loading

[0119] Before parasitic loading (first radiator only) After parasitic loading (first radiator + second radiator) Antenna efficiency -6.9 -6 Same side pocket SNR -66.5 -62.9 Same side pocket S21 -73.4 -68.9 Opposite pocket SNR -70.7 -66.4 Side pocket S21 -77.6 -72.4

[0120] In summary, the first radiator 31 couples and feeds the second radiator 32 in a “mouth-to-mouth” manner, which can significantly improve the efficiency of the antenna structure.

[0121] In a possible implementation, Fig.13 As shown, the first radiator 31 couples and feeds the second radiator 32 in a "mouth-to-mouth" manner. The first grounding point G1 is approximately located near the geometric center of the first radiator 31. Exemplarily, the end of the first radiator 31 facing the second radiator 32 has a first midpoint O, and the end of the first radiator 31 facing away from the second radiator 32 has a second midpoint O'. The line between the first midpoint O and the second midpoint O' is parallel to the first direction x, and the first grounding point G1 can be located near the midpoint of the line between the first midpoint O and the second midpoint O'.

[0122] In other embodiments, the feeding point F is located between the first grounding point G1 and the first gap D, and the second grounding point G2 is located at an end of the second radiator 32 close to the first gap D. In this case, the first grounding point G1 is far away from the first gap D, and the second grounding point G2 is close to the first gap D. Electromagnetic coupling is formed between the first radiator 31 and the second radiator 32, and the first radiator 31 is coupled and fed to the second radiator 32 in a "mouth-to-back" manner.

[0123] On the basis of the above, the present application does not limit the form of the first radiator 31 and the second radiator 32. The first radiator 31 and the second radiator 32 can be equivalent to a wire antenna or a planar antenna, and can also include various forms of hollowing and perforation. The first radiator 31 is coupled to the second radiator 32 in a "back-to-mouth" manner to couple and feed the first radiator 31 to the second radiator 32, which illustrates various forms of the first radiator 31 and the second radiator 32. It should be understood that in the "back-to-back" manner and the "mouth-to-mouth" manner, the first radiator 31 and the second radiator 32 can have similar forms.

[0124] In some embodiments, Fig.17 As shown, the first radiator 31 includes a first hollow area 33, and at least part of the first hollow area 33 is located between the feeding point F and the first grounding point G1. At this time, since the first hollow area 33 is located between the feeding point F and the first grounding point G1, the current path between the feeding point F and the first grounding point G1 can be increased, so that the first radiator 31 can achieve the same electrical length through a smaller area. In this way, the miniaturization of the antenna structure 3 can be achieved without affecting the function of the antenna structure 3. This is conducive to achieving a more flexible architectural layout of the wearable device 100 and reducing the volume and weight of the wearable device 100.

[0125] In a possible implementation, Fig.18 As shown, the first hollow area 33 includes a first slit 331, a second slit 332 and a third slit 333. The second slit 332 is located between the first slit 331 and the third slit 333, and the second slit 332 is connected to the first slit 331 and the third slit 333. The second slit 332 is located between the feeding point F and the first grounding point G1. The length direction of the first slit 331 and the third slit 333 is parallel to the first direction x. In this way, the first slit 331, the second slit 332 and the third slit 333 can be connected to form a U shape. The first grounding point G1 and the feeding point F are separated by the second slit 332. The current starts from the feeding point F and has to bypass the first slit 331 or the third slit 333 to reach the first grounding point G1, which can effectively increase the current path, thereby achieving the above-mentioned beneficial effects.

[0126] The embodiment of the present application does not limit the length relationship between the first slit 331 and the third slit 333. For example, the first slit 331 and the third slit 333 are equal, and the U-shape is a symmetrical U-shape. For example, the first slit 331 and the third slit 333 are not equal, and the U-shape is an asymmetrical U-shape.

[0127] In some embodiments, Fig.19 As shown, the first radiator 31 is in the form of a meandering line. In this way, the copper-clad area of ​​the antenna structure 3 is greatly reduced, and the corresponding antenna bracket area is also effectively reduced, which is beneficial to the weight reduction of the entire structure of the wearable device 100, making the wearable device 100 lighter and more convenient to wear.

[0128] In some embodiments, continuing as Fig.19 As shown, the second radiator 32 is an L-shaped asymmetric structure, and the second ground point G2 is arranged below the midline perpendicular to the second direction y on the second radiator 32. The L-shaped asymmetric structure reduces the physical length of the second radiator, and such a structure layout is more flexible.

[0129] In some embodiments, Fig. 20 and Fig.21 As shown, the second radiator 32 is an L-shaped asymmetric structure. Exemplarily, the end of the first radiator 31 facing the second radiator 32 has a first midpoint O, the end of the first radiator 31 facing away from the second radiator 32 has a second midpoint O', and the line OO' between the first midpoint and the second midpoint is parallel to the first direction x. Fig. 20 The area where the second radiator 32 is located below the straight line where the connecting line OO' is located accounts for a large proportion. Fig.21 In the figure, the area where the second radiator 32 is located above the straight line where the line OO' is located accounts for a large proportion. Fig. 22 As shown, curve ① is the radiation efficiency when there is only the first radiator 31, and curve ② is Fig.18 The radiation efficiency of antenna structure 3, curve ③ is Fig. 20 The radiation efficiency of antenna structure 3, curve ④ is Fig.21 The radiation efficiency of the antenna structure 3.

[0130] By comparison, it can be seen that when the second radiator 32 is a symmetrical structure and an asymmetrical structure, the radiation efficiency point of the antenna structure 3 is located at 2.45 GHz. In addition, in the three cases, Fig.21 The second radiator 32 has the highest peak efficiency, the widest peak bandwidth and the best overall effect. The two forms of the L-shaped asymmetric structure have two different peak efficiency and bandwidth realization effects, which can make the design options of the antenna structure 3 more diversified.

[0131] In some embodiments, such as Fig.23 As shown, Fig.23(A) is the current distribution of the antenna structure in the back-to-mouth mode. Fig.23 (B) is the current distribution of the antenna structure in the back-to-back mode. Fig.23 (C) in the figure is the current distribution of the antenna structure in the mouth-to-mouth mode. The white dots are the weak current points, and the black dots are the strong current points. The physical length of the second radiator can be reduced by subtracting the weak current point on the second radiator.

[0132] In some embodiments, the first radiator is used to generate a first main resonance, and the second radiator is used to generate a first parasitic resonance. The center frequency of the first main resonance is the first main frequency f01, the center frequency of the first parasitic resonance is the first parasitic frequency f11, and |f01-f11|≤900MHz. In this case, because the first main frequency f01 and the first parasitic frequency f11 are similar in magnitude, the second radiator that generates the first parasitic resonance can play a role in performance auxiliary transmission for the first radiator that generates the first main resonance.

[0133] Among them, the resonant frequency is also called the resonance frequency. The resonant frequency can refer to the frequency at which the imaginary part of the antenna input impedance is zero. The resonant frequency can have a frequency range, that is, the frequency range in which resonance occurs. The frequency corresponding to the strongest resonance point is the center frequency point frequency. Regardless of the type of antenna, it always works within a certain frequency range (band width). For example, an antenna that supports the B40 band has an operating frequency band that includes frequencies in the range of 2300MHz to 2400MHz, or in other words, the antenna's operating frequency band includes the B40 band. The frequency range that meets the index requirements can be regarded as the antenna's operating frequency band.

[0134] In other embodiments, the first radiator is used to generate the first main resonance and the second main resonance, and the second radiator is used to generate the first parasitic resonance and the second parasitic resonance. The center frequency of the first main resonance is the first main frequency f01, the center frequency of the second main resonance is the second main frequency f02, the center frequency of the first parasitic resonance is the first parasitic frequency f11, the center frequency of the second parasitic resonance is the second parasitic frequency f12, |f01-f11|≤900MHz, |f02-f12|≤900MHz. In this case, because the first main frequency f01 and the first parasitic frequency f11 are similar in size, and because the second main frequency f02 and the second parasitic frequency f12 are similar in size, the second radiator can play a role in assisting the first radiator in performance transmission in both the frequency band where the first main resonance is located and the frequency band where the second main resonance is located.

[0135] In a possible implementation, the resonance frequency band of the first main resonance includes 2.4 GHz-2.485 GHz, and the first main frequency f01 is located in the 2.4 GHz-2.485 GHz frequency band. The resonance frequency band of the first parasitic resonance includes 1.5 GHz-3.385 GHz, and the first parasitic frequency f11 is located in the 1.5 GHz-3.385 GHz frequency band.

[0136] In a possible implementation, the resonant frequency band of the second main resonance includes 5.2 GHz-5.9 GHz, and the second main frequency f02 is located in the 5.2 GHz-5.9 GHz frequency band. The resonant frequency band of the second parasitic resonance includes 4.3 GHz-6.8 GHz, and the second parasitic frequency f12 is located in the 4.3 GHz-6.8 GHz frequency band.

[0137] In a possible implementation manner, the first radiator body generates a first main resonance, and the first hollow area generates a second main resonance.

[0138] In another possible implementation, the first radiator body generates a first main resonance and a second main resonance, wherein the first main resonance is a fundamental mode of the first radiator, and the second main resonance is a higher-order mode of the first radiator.

[0139] In a possible implementation manner, the second radiator includes a second hollow region. The second radiator body generates a first parasitic resonance, and the second hollow region generates a second parasitic resonance.

[0140] In another possible implementation, the second radiator body generates a first parasitic resonance and a second parasitic resonance. The first parasitic resonance is a fundamental mode of the second radiator, and the second parasitic resonance is a higher-order mode of the second radiator.

[0141] In some embodiments, the electrical length of the first radiator is 0.1λ-0.25λ, the electrical length of the second radiator is 0.1λ-0.2λ, and the electrical length of the first slot is 0.004-0.03λ, where λ is the operating wavelength corresponding to the first main frequency.

[0142] In a possible implementation, the resonance frequency band of the first main resonance includes 2.4 GHz-2.485 GHz, the physical length of the first radiator is 12 mm-32 mm; the physical length of the second radiator is 12 mm-24 mm; the physical length of the first gap is 0.5 mm-3.5 mm. For example, the physical length of the first radiator can be 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm. 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm or 32 mm. For example, the physical length of the second radiator can be 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm. 20 mm, 21 mm, 22 mm, 23 mm or 24 mm. For example, the physical length of the third radiator can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm or 3.5mm.

[0143] In some embodiments, the wearable device may be a true wireless stereo (TWS) Bluetooth headset. The TWS Bluetooth headset includes an earplug portion and an ear handle portion. The earplug portion is connected to one end of the ear handle portion. The earplug can be accommodated or embedded in the user's ear, and the ear handle portion 2 can be hung on the edge of the user's ear. The first radiator is closer to the other end of the ear handle portion than the second radiator. That is, when the user wears the TWS Bluetooth headset, the second radiator is closer to the user's auricle relative to the first radiator.

[0144] It should be understood that the antenna structure provided in the embodiments of the present application can also be applied to wearable devices other than headphones, such as smart watches or smart glasses.

[0145] like Fig.24 As shown, the antenna structure in the above embodiment can be applied to a smart watch. The present application does not limit the specific location of the antenna structure, which is only used as an example. For example, the radiator of the antenna can be set in the bezel, the PCB can be set in the space surrounded by the metal shell, the feed unit can be set on the PCB, and the switch can also be set on the PCB. The design position can be as follows: Fig.24 As shown, it should be understood that the radiator of the antenna can also be set on the inner surface of the shell of the smart watch.

[0146] like Fig.25 As shown, the antenna structure can utilize the temple design of the smart glasses, and its design position is shown in the figure, or it can also utilize the frame design of the smart glasses, or it can also be adjusted according to actual production design requirements. For example, the antenna radiator can be set in the inner space of the temple or frame of the smart glasses, the PCB can be set in the temple, the feeding unit can be set on the PCB, and the switch can also be set on the PCB, and its design position is as shown in the figure. Fig.25 shown.

[0147] In some embodiments, the antenna structure is disposed on the temple of the smart glasses. One end of the temple is connected to the frame, and the other end of the temple is the temple end. The first radiator is closer to the temple end than the second radiator, that is, the second radiator is closer to the user's auricle than the first radiator.

[0148] It should be understood that the antenna structure provided in the embodiments of the present application can also be applied to other electronic devices besides wearable devices, such as mobile phones, tablets, etc.

[0149] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0150] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wearable device, for wearing on a user's head, characterized in that: include: Housing and antenna structure; The shell forms a cavity, and the antenna structure is arranged in the cavity; The antenna structure comprises: A first radiator and a second radiator, wherein the first radiator and the second radiator are arranged along a first direction; the first direction is a length direction of the shell; A first gap is provided between the first radiator and the second radiator; A feeding point and a first grounding point are provided on the first radiator, a second grounding point is provided on the second radiator, and the first grounding point and the second grounding point are configured to be grounded; The first radiator is used to couple and feed power to the second radiator; When the wearable device is worn by a user, the second radiator is closer to the user than the first radiator.

2. The wearable device according to claim 1, characterized in that: The first grounding point is located between the feeding point and the first gap; or the feeding point is located between the first grounding point and the first gap.

3. The wearable device according to claim 1 or 2, characterized in that: The second grounding point is located at an end of the second radiator close to the first slot; or, the second grounding point is located at an end of the second radiator away from the first slot.

4. The wearable device according to any one of claims 1 to 3, characterized in that: The first radiator includes a first hollow area, and at least a portion of the first hollow area is located between the feeding point and the first grounding point.

5. The wearable device according to claim 4, characterized in that: The first hollow area includes a first slit, a second slit and a third slit; the second slit is located between the first slit and the third slit; the second slit is connected to the first slit and the third slit; the second slit is located between the feeding point and the first grounding point; the length direction of the first slit and the third slit is parallel to the first direction.

6. The wearable device according to claim 4 or 5, characterized in that: The first radiator is used to generate a first main resonance, and the center frequency of the first main resonance is a first main frequency f01; the second radiator is used to generate a first parasitic resonance, and the center frequency of the first parasitic resonance is a first parasitic frequency f11; |f01-f11|≤900MHz.

7. The wearable device according to claim 6, characterized in that: The first radiator is further used to generate a second main resonance, the center frequency of which is a second main frequency f02; the second radiator is further used to generate a second parasitic resonance, the center frequency of which is a second parasitic frequency f12; |f02-f12|≤900MHz.

8. The wearable device according to any one of claims 1 to 7, characterized in that: The first radiator is used to generate a first main resonance; the resonance frequency band of the first main resonance includes 2.4GHz-2.485GHz; the physical length of the first radiator is 12mm-32mm; the physical length of the second radiator is 12mm-24mm; the physical length of the first gap is 0.5mm-3.5mm.

9. The wearable device according to any one of claims 1 to 8, characterized in that: The wearable device also includes a fixing portion; one end of the fixing portion is connected to the first end of the shell; the first end, the first radiator, the first gap and the second radiator are arranged in sequence along the first direction.

10. The wearable device according to claim 9, characterized in that: The wearable device comprises a Bluetooth headset, which is used to be worn on the ear of a user, wherein the fixing part is used to be hung on the ear of the user.

11. The wearable device according to claim 9 or 10, characterized in that: The fixing portion is in a "C" shape or a "U" shape, and the other end of the fixing portion is spaced apart from the shell.

12. The wearable device according to any one of claims 1 to 11, characterized in that: The first radiator and the second radiator are attached to the inner wall of the cavity.

13. The wearable device according to any one of claims 1 to 12, characterized in that: A first bracket and a second bracket are arranged in the cavity, the first radiator is connected to the first bracket, and the second radiator is connected to the second bracket.

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