A wearable device

Abstract

The embodiment of the present application provides a wearable device, comprising: a metal frame, a printed circuit board (PCB) and a first feeding unit; wherein a gap is formed between the metal frame and the PCB; the metal frame comprises a first feeding point, a first grounding point and a second grounding point, and the metal frame is grounded at the first grounding point and the second grounding point; the metal frame is divided into a first region and a second region by the first grounding point and the second grounding point, and the corresponding circumferential length of the first region is greater than the corresponding circumferential length of the second region; the first feeding point is arranged in the first region, and the distance between the first feeding point and the first grounding point along the metal frame is less than one third of the corresponding circumferential length of the first region; and the first feeding unit feeds at the first feeding point. The technical scheme provided by the present application can realize full-band coverage of a 4G communication system by using the metal frame of the wearable device.

Description

Technical Field

[0001] This application relates to the field of wireless communication, and more particularly to a wearable device. Background Technology

[0002] With the development of mobile communication technology, wearable devices can be used to monitor important data such as heart rate and sleep status at any time, and synchronize data by connecting to the Internet through communication functions. Wearable devices can also obtain information such as weather temperature. In addition, the built-in near field communication (NFC) function allows users to easily and simply make purchases through wearable devices.

[0003] The aforementioned wearable devices rely heavily on communication functions, requiring built-in antennas to transmit or receive electromagnetic signals. Currently, monopoles and inverted-F antennas (IFA) are commonly used, with the antennas positioned around the perimeter of a printed circuit board (PCB). However, due to the size limitations of wearable devices (such as smartwatches), their built-in antennas often struggle to support all frequency bands in second-generation (4G) mobile communication systems. Summary of the Invention

[0004] This application provides a wearable device that utilizes slot antenna theory to achieve full-band coverage in 4G communication using the metal frame of the wearable device, thus providing good communication performance for the wearable device.

[0005] In a first aspect, a wearable device is provided, comprising: a printed circuit board (PCB) and an antenna structure, the antenna structure including a metal frame and a first feeding unit; wherein a gap is formed between the metal frame and the PCB; the metal frame includes a first feeding point, a first grounding point, and a second grounding point, the metal frame being grounded at the first grounding point and the second grounding point; the metal frame is divided into a first region and a second region by the first grounding point and the second grounding point, the circumferential length of the first region being greater than the circumferential length of the second region; the first feeding point is disposed in the first region, the distance between the first feeding point and the first grounding point along the metal frame is less than one-third of the circumferential length of the first region; the first feeding unit feeds the antenna structure at the first feeding point.

[0006] According to the technical solution of this application embodiment, without increasing the structural complexity of the wearable device, the antenna structure of the wearable device can be formed by using the metal frame and printed circuit board of the wearable device, which can generate three resonances and cover the full frequency band in the 4G communication system.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the antenna structure is a slot antenna.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, when the first feeding unit is fed, the antenna structure generates a first resonance, a second resonance, and a third resonance; wherein the frequency of the resonance point of the first resonance is less than the frequency of the resonance point of the second resonance, and the frequency of the resonance point of the second resonance is less than the frequency of the resonance point of the third resonance.

[0009] According to the technical solution of this application embodiment, when the first feeding unit is powered, the antenna structure can generate a first resonance, a second resonance, and a third resonance. These can correspond to the low-frequency band, mid-frequency band, and high-frequency band in a 4G communication system, respectively. Specifically, when the first resonance is generated, the antenna structure can operate in half-wavelength mode; when the second resonance is generated, the antenna structure can operate in double-wavelength mode; and when the third resonance is generated, the antenna structure can operate in three-half-wavelength mode.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the operating frequency band of the antenna structure corresponding to the second resonance covers the GPS frequency band.

[0011] According to the technical solution of the embodiments of this application, the second resonance can also cover the global positioning system frequency band, and the positioning antenna can also be integrated on the metal frame of the wearable device to provide positioning services for the wearable device, which can further reduce the complexity of the overall structure.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the operating frequency band of the antenna structure corresponding to the first resonance covers 698MHz-960MHz, the operating frequency band of the antenna structure corresponding to the second resonance covers 1710MHz-2170MHz, and the operating frequency band of the antenna structure corresponding to the third resonance covers 2300MHz to 2690MHz.

[0013] According to the technical solution of the embodiments of this application, the first resonance, the second resonance and the third resonance can respectively correspond to the low frequency band, the mid frequency band and the high frequency band in the 4G communication system.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the wearable device further includes a bandpass filter; the metal frame further includes a third grounding point, the third grounding point being disposed in the first region, located between the first power supply point and the second grounding point; one end of the bandpass filter is electrically connected to the metal frame at the third grounding point, and the other end is grounded.

[0015] According to the technical solution of the embodiments of this application, it can be used to adjust the resonance point of the antenna structure to generate resonance.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, the operating frequency band of the bandpass filter covers the operating frequency band of the antenna structure corresponding to the third resonance.

[0017] According to the technical solution of the embodiments of this application, the bandpass filter can shorten the return path to ground and increase the radiation performance when the antenna is operating in the operating frequency band corresponding to the third resonance.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the bandpass filter is capacitive in the operating frequency band of the antenna structure corresponding to the first resonance or the operating frequency band of the antenna structure corresponding to the second resonance.

[0019] According to the technical solution of this application embodiment, since the bandpass filter operates capacitively in the low-frequency and mid-frequency bands when it operates in the high-frequency band, the capacitor in the bandpass filter can be set as an adjustable device, which can be used to adjust the antenna structure to generate the first resonance and the second resonance covering the resonance points of the low-frequency and mid-frequency bands in the 4G mobile communication system.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the bandpass filter operates in a frequency band covering 2300MHz to 2690MHz.

[0021] According to the technical solution of the embodiments of this application, the bandpass filter 410 can operate in the high-frequency band of a 4G mobile communication system.

[0022] In conjunction with the first aspect, in some implementations of the first aspect, the distance between the third grounding point and the first grounding point along the metal frame is one-third of the circumferential length corresponding to the first region.

[0023] According to the technical solution of the embodiments of this application, the return path to ground when the antenna structure is working in the three-half wavelength mode can be effectively shortened. When working in the high frequency band, the interference caused by the environment near the metal frame can be reduced, and the radiation characteristics of the antenna structure when working in the high frequency band can be increased.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the circumferential length corresponding to the first region is half of the operating wavelength corresponding to the resonant point of the first resonance.

[0025] According to the technical solution of the embodiment of this application, the circumferential length corresponding to the first region is half of the working wavelength corresponding to the resonance point of the first resonance, and the specific value can be obtained from simulation.

[0026] In conjunction with the first aspect, in some implementations of the first aspect, the circumferential length corresponding to the first region is between 120mm and 90mm.

[0027] In conjunction with the first aspect, in some implementations of the first aspect, the characteristic is that the circumferential length corresponding to the first region is 112mm, 102mm or 97mm.

[0028] According to the technical solution of the embodiments of this application, for a circular metal frame, when the surface diameter is 46mm, the circumferential length corresponding to the first region 250 can be 112mm; when the surface diameter is 42mm, the circumferential length corresponding to the first region 250 can be 102mm; and when the surface diameter is 40mm, the circumferential length corresponding to the first region 250 can be 97mm.

[0029] In conjunction with the first aspect, in some implementations of the first aspect, the angle of the central angle corresponding to the first region is between 288° and 252°.

[0030] According to the technical solution of this application embodiment, the central angle corresponding to the first region can be between 288° and 252°. The radiator of the antenna structure occupies approximately 0.7 to 0.8 of the metal frame.

[0031] In conjunction with the first aspect, in some implementations of the first aspect, the first region is a metallic material and the second region is a non-metallic material.

[0032] According to the technical solution of this application embodiment, the gap between the second region and the PCB can be used to electrically connect the screen of a wearable device to the PCB, or to electrically connect a flexible circuit board to the PCB. This can avoid excessive wiring and reduce antenna structure losses.

[0033] Secondly, a wearable device is provided, comprising: an antenna structure and a printed circuit board (PCB). The antenna structure includes a metal frame, a bandpass filter, and a first feed unit. A gap is formed between the metal frame and the PCB. The metal frame includes a first feed point, a first ground point, and a second ground point, and the metal frame is grounded at the first ground point and the second ground point. The metal frame is divided into a first region and a second region by the first ground point and the second ground point, and the circumferential length of the first region is greater than the circumferential length of the second region. The first feed point is disposed in the first region, and the first feed point is connected to the first ground point. A grounding point is located at a distance less than one-third of the circumferential length corresponding to the first region along the metal frame; the first feeding unit feeds the antenna structure at the first feeding point; the metal frame also includes a third grounding point, which is located in the first region, between the first feeding point and the second grounding point; one end of the bandpass filter is electrically connected to the metal frame at the third grounding point, and the other end is grounded; the operating frequency band of the bandpass filter covers 2300MHz to 2690MHz; the distance between the third grounding point and the first grounding point along the metal frame is one-third of the circumferential length corresponding to the first region. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a wearable device provided in an embodiment of this application.

[0035] Figure 2 This is a schematic structural diagram of the antenna structure of the wearable device provided in this application.

[0036] Figure 3 for Figure 2 The simulation results of the S-parameters of the antenna structure shown are presented.

[0037] Figure 4 This is a schematic diagram of the electric field strength distribution of the antenna structure provided in the embodiments of this application.

[0038] Figure 5 This is a schematic diagram of the electric field distribution within the slot when the antenna structure operates in half-wavelength mode.

[0039] Figure 6 This is a schematic diagram of the electric field distribution within the slot when the antenna structure is operating in one wavelength mode.

[0040] Figure 7 This is a schematic diagram of the electric field distribution within the slot when the antenna structure operates in three-half wavelength mode.

[0041] Figure 8 This is a schematic structural diagram of another antenna structure for the wearable device provided in this application.

[0042] Figure 9 This is a schematic structural diagram of a wearable device provided in an embodiment of this application.

[0043] Figure 10 This is an unfolded view of the metal frame provided in the embodiments of this application.

[0044] Figure 11 This is a bandpass filter structure provided in the embodiments of this application.

[0045] Figure 12 This is a schematic diagram of a feeding scheme for an antenna structure provided in an embodiment of this application. Detailed Implementation

[0046] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0047] The wearable device provided in this application can be a portable device that can be integrated into a user's clothing or accessories, possesses computing capabilities, and can connect to mobile phones and various terminal devices. Exemplarily, the wearable device can be a watch, smart wristband, portable music player, health monitoring device, computing or gaming device, smartphone, accessory, etc. In some embodiments, the wearable device is a watch that can be worn around a user's wrist.

[0048] Figure 1 This is a schematic structural diagram of the wearable device provided in this application. In some embodiments, the wearable device may be a watch or a wristband.

[0049] refer to Figure 1 The wearable device 100 includes a main body 101 and one or more wristbands 102. Figure 1 A portion of the wristband 102 is shown in the diagram. The wristband 102 is fixedly connected to the main body 101 and can be wrapped around the wrist, arm, leg, or other part of the body to secure the wearable device to the user. The main body 101, as the central element of the wearable device 100, may include a metal frame 180 and a screen 140. The metal frame 180 may surround the wearable device as part of its appearance, enclosing the screen 140. The edges of the screen 140 are adjacent to and fixed to the frame 180, forming a surface of the main body 101. A receiving space is formed between the metal frame 180 and the screen 140 to accommodate a combination of multiple electronic devices to achieve various functions of the wearable device 100. The main body 101 also includes an input device 120, a portion of which is accommodated in the receiving space between the metal frame 180 and the screen 140, with the exposed portion of the input device 120 easily accessible to the user.

[0050] It is understood that the metal frame 180 of the wearable device in this embodiment can be circular, square, polygonal, or other regular or irregular shapes, and is not limited here. For the sake of brevity, the following embodiment uses a circular metal frame 180 as an example for illustration.

[0051] The screen 140, serving as the surface of the main body 101, can act as a protective plate for the main body 101 to prevent components housed within the metal frame 180 from being exposed and damaged. Exemplarily, the screen 140 may include a liquid crystal display (LCD) and a protective element, which may be sapphire crystal, glass, plastic, or other materials. The screen's protective element can be integrally formed with the metal frame using thermoplastic composite (PC / ABS).

[0052] Users can interact with wearable device 100 through screen 140. For example, screen 140 can receive user input and make corresponding outputs in response to the input. For instance, users can select (or otherwise open, edit, etc.) a graphic by touching or pressing a graphic location on screen 140.

[0053] Input device 120 is attached to the outside of metal frame 180 and extends into the interior of metal frame 180. In some embodiments, input device includes a connected head 121 and a lever 122. Lever 122 extends into housing 180, and head 121 protrudes from housing 180, serving as a contact part with the user to allow the user to contact the input device and receive user input operations by rotating, translating, tilting, or pressing head 121. When the user operates head 121, lever 122 can move with head 121. It is understood that head 121 can be of any shape, for example, head 121 can be cylindrical. It is understood that rotatable input device 120 can be referred to as a button, and in embodiments where wearable device 100 is a watch, rotatable input device 120 can form the crown of the watch, referred to as crown.

[0054] In this application, by designing the input device 120, one or more functions are integrated into the input device 120 to improve the user experience, which will be described in detail below.

[0055] It is understandable that input device 120 is not limited to Figure 1 As shown in the structure, any mechanical component that can receive user input can be used as the input device of this application.

[0056] Wearable device 100 includes a button 1202, which, as an example of input device 120, allows a user to press, move, or tilt the button 1202 to perform input operations. Exemplarily, the button 1202 may be mounted on the side 180-A of a metal frame 180, with a portion of the button 1202 exposed and another portion extending from the side of the metal frame 180 toward the interior of the housing 180 (not shown). Exemplarily, the button 1202 may also be located on the head 121 of a button 1201, allowing for both rotation and pressing operations. Exemplarily, the button 1202 may also be located on the top surface of the main body 101 where a display screen 140 is mounted.

[0057] Continue to refer to Figure 1 In other embodiments, the wearable device 100 may include a button 1201 and a key 1202. The button 1201 and key 1202 may be disposed on the same surface of the metal frame 180, for example, both on the same side of the metal frame 180. Alternatively, the button 1201 and key 1202 may be disposed on different surfaces of the metal frame 180. This application does not impose any limitations on these embodiments. It is understood that the wearable device 100 may include one or more keys 1202, or one or more buttons 1201.

[0058] It should be understood that wearable devices rely on communication functions and require built-in antennas to transmit or receive electromagnetic signals. Currently, monopole and IFA antennas are commonly used. However, due to the size limitations of wearable devices (such as smartwatches), their built-in antennas can hardly support all frequency bands in 4G mobile communication systems.

[0059] This application provides an antenna design scheme for wearable devices, which can utilize the metal frame of the wearable device to achieve low band (LB) (698MHz-960MHz), medium band (MB) (1710MHz-2170MHz) and high band (HB) (2300MHz-2690MHz) frequencies in 4G communication systems, providing good communication performance for wearable devices.

[0060] Figure 2 This is a schematic structural diagram of the antenna structure of the wearable device provided in this application.

[0061] like Figure 2 As shown, the wearable device may include a PCB 220 and an antenna structure 200, the antenna structure may include a metal frame 210 and a first feeding unit 230.

[0062] A gap 240 is formed between the metal frame 210 and the PCB 220. The metal frame 210 may include a first feed point 201, a first ground point 211, and a second ground point 212. The metal frame 210 may be grounded at the first ground point 211 and the second ground point 212. The metal frame 210 is divided into a first region 250 and a second region 260 by the first ground point 211 and the second ground point 212, and the circumferential length of the first region 250 is greater than the circumferential length of the second region 260. The first feed point 201 may be located in the first region 250, close to the first ground point 211. The distance between the first feed point 201 and the first ground point 211 along the metal frame 210 is less than one-third of the circumferential length of the first region 250. The first feed unit 230 feeds the antenna structure at the first feed point 201. The circumferential length of the first region 250 can be considered as the longer distance from the first ground point 211 along the surface of the metal frame 210 to the second ground point 212. The circumferential length corresponding to the second region 260 can be considered as the shorter distance from the first grounding point 211 along the surface of the metal frame 210 to the second grounding point 212.

[0063] Alternatively, the antenna structure 200 can be a slot antenna.

[0064] It should be understood that PCB220 is made of multilayer dielectric laminate, and there are metal plating layers in the multilayer dielectric laminate, which can be used as the ground of the antenna structure. The metal frame 210 can be set around PCB220.

[0065] Optionally, the first region 250 of the metal frame 210 can be made of metal, and the second region 260 can be made of non-metallic material.

[0066] Optionally, the first power supply unit 230 can be disposed on PCB 220 and can be a power chip in a wearable device.

[0067] Optionally, the wearable device may also include at least one tuning device, which may be located at the first grounding point 211 or the second grounding point 212, for adjusting the operating frequency of the antenna structure.

[0068] Optionally, the central angle corresponding to the first region 250 can be between 288° and 252°. The radiator of the antenna structure occupies approximately 0.7 to 0.8 of the metal frame 210.

[0069] Optionally, the circumferential length of the first region can be between 120 mm and 90 mm.

[0070] Optionally, for a circular metal frame, when the surface diameter is 46mm, the circumferential length corresponding to the first region 250 can be 112mm; when the surface diameter is 42mm, the circumferential length corresponding to the first region 250 can be 102mm; and when the surface diameter is 40mm, the circumferential length corresponding to the first region 250 can be 97mm. It should be understood that the circumferential length corresponding to the first region 250 can be adjusted according to design or simulation, and this application does not impose any limitations on this.

[0071] Optionally, the gap between the second region 260 and PCB 220 can be used to electrically connect the screen of the wearable device to PCB 220, or to electrically connect a flexible printed circuit (FPC) to PCB 220. This avoids excessive wiring and reduces antenna structure losses.

[0072] Figure 3 for Figure 2 The simulation results of the S-parameters of the antenna structure shown are presented.

[0073] like Figure 3 As shown, when the first feeding unit is powered, the antenna structure can generate a first resonance, a second resonance, and a third resonance.

[0074] The first resonance can be the resonance generated when the antenna structure operates in half-wavelength mode, corresponding to LB in a 4G communication system. The second resonance can be the resonance generated when the antenna structure operates in full-wavelength mode, corresponding to MB in a 4G communication system. The third resonance can be the resonance generated when the antenna structure operates in three-half-wavelength mode, corresponding to HB in a 4G communication system.

[0075] It should be understood that the antenna structure provided in the technical solution of this application utilizes the concept of volume multiplexing, allowing each resonance to fill the entire antenna structure. Furthermore, parasitic stubs can be added to this solution to excite new resonant modes and further extend the antenna's operating bandwidth.

[0076] Optionally, the second resonance can also cover the Global Positioning System (GPS) frequency band, integrating the positioning antenna into the metal frame of the wearable device to provide positioning services for the wearable device, which can further reduce the complexity of the overall structure.

[0077] Optionally, the operating frequency band corresponding to the antenna structure can also cover the frequency bands corresponding to the Global System of Mobile Communication (GSM) system or Code Division Multiple Access (CDMA), or it can also cover the frequency bands corresponding to Wideband Code Division Multiple Access (WCDMA), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, or General Packet Radio Service (GPRS), etc. It should be understood that the technical solution provided in this application can also be applied to 5G communication, and this application does not impose any limitations on it.

[0078] Figure 4 This is a schematic diagram of the electric field strength distribution of the antenna structure provided in the embodiments of this application.

[0079] like Figure 2 As shown, the metal frame 210 can be unfolded from the first grounding point 211 to form... Figure 4 The structure. That is... Figure 4 The two ends of the metal frame 210 in the structure can be connected to form Figure 2 The circular structure in it.

[0080] like Figure 4 As shown, the first feed point 201 can be located near ground, i.e., in the strong current / weak electric field region of the metal frame. The antenna structure can generate multiple resonants operating at harmonics, for example, the antenna structure can operate in half-wavelength mode, one-wavelength mode, three-half-wavelength mode, or two-wavelength mode, etc.

[0081] Optionally, when the first region 250 of the metal frame 210 is made of metal and the second region 260 is made of non-metallic material, electronic components can be provided at the connection between the first region 250 and the second region 260. That is, electronic devices can also be provided at the first grounding point 211. The resonant point of the antenna structure can be adjusted by the capacitive or inductive properties of the electronic devices. For example, an inductor can be provided at the first grounding point 211, with one end connected to the metal frame 210 at the first grounding point 211 and the other end grounded, which can lower the resonant point of the antenna structure.

[0082] Optionally, electronic components can be placed at the second grounding point 212 to adjust the resonant point of the antenna structure. For example, an inductor can be placed at the second grounding point 212, with one end connected to the metal frame 210 at the second grounding point 212 and the other end grounded, which can lower the resonant point of the antenna structure.

[0083] Figures 5 to 7 This is a schematic diagram showing the distribution of electric field intensity of the antenna structure provided in this application operating in various modes. Wherein, Figure 5 This is a schematic diagram of the electric field distribution within the slot when the antenna structure operates in half-wavelength mode. Figure 6 This is a schematic diagram of the electric field distribution within the slot when the antenna structure is operating in one wavelength mode. Figure 7 This is a schematic diagram of the electric field distribution within the slot when the antenna structure operates in three-half wavelength mode.

[0084] like Figures 5 to 7 The figure shows the distribution of electric field intensity on the gap formed by the PCB and the metal frame under various working modes. The dark area in the figure is the position of zero electric field, which can correspond to the strong current point on the metal frame.

[0085] Optionally, electronic devices, such as capacitors or inductors, can be loaded or unloaded at the electric field strength points corresponding to each mode, and the resonant points corresponding to each mode can be finely adjusted.

[0086] Figure 8 This is a schematic structural diagram of another antenna structure for the wearable device provided in this application.

[0087] like Figure 8 As shown, the wearable device also includes a second feeding unit 310. The metal frame 210 may also include a second feeding point 301, which may be located in the first region 250, between the first feeding point 201 and the second grounding point 212. The second feeding unit 310 can feed the antenna structure at the second feeding point.

[0088] Optionally, the distance between the second feed point 301 and the first ground point 211 along the metal frame 210 is half the circumferential length corresponding to the first region 250. That is, as follows: Figure 4 As shown, the second feed point 301 can be located at the electric field zero point in the one-wavelength mode. When the second feed unit 310 is fed at the second feed point 301, it can excite the antenna structure in half-wavelength mode and three-half-wavelength mode, corresponding to LB and HB in a 4G communication system. It should be understood that the wearable device may include a bandpass filter to generate MB, enabling the antenna structure to operate in a frequency band that covers the 4G communication system.

[0089] Figure 9 and Figure 10This is a schematic structural diagram of yet another antenna structure for the wearable device provided in this application. Among them, Figure 9 This is a schematic structural diagram of a wearable device provided in an embodiment of this application. Figure 10 This is an unfolded view of the metal frame provided in the embodiments of this application.

[0090] like Figure 9 As shown, the wearable device also includes a bandpass filter 410.

[0091] The metal frame 210 may further include a third grounding point 401, which is located in the first region 250, between the first feed point 201 and the second grounding point 212. One end of the bandpass filter 410 is electrically connected to the metal frame 210 at the third grounding point 401, and the other end is grounded.

[0092] Optionally, the bandpass filter 410 can be mounted on the PCB 220 and electrically connected to the metal frame 210 at the third grounding point 401 via a metal spring.

[0093] Optionally, the bandpass filter 410 operates in a frequency band covering 2300MHz to 2690MHz. That is, the bandpass filter 410 can operate in the HB frequency band of a 4G mobile communication system.

[0094] Optionally, the distance between the third grounding point 401 and the first grounding point 211 along the metal frame 210 is one-third of the circumferential length corresponding to the first region 250. The third grounding point 401 is the high-current point when the antenna structure operates in three-half wavelength mode, such as... Figure 10 As shown, this can effectively shorten the return path to ground when the antenna structure operates in three-half wavelength mode, and reduce interference caused by the environment near the metal frame.

[0095] like Figure 11 The diagram illustrates a simple bandpass filter structure. It should be understood that this embodiment does not limit the specific form of the bandpass filter. The bandpass filter may include an inductor 411 and a capacitor 412. Since the bandpass filter operates capacitively with respect to the LB and MB when at HB, the capacitor 412 can be configured as an adjustable device, which can be used to adjust the antenna structure to generate the first and second resonances covering the resonance points of the LB and MB in the 4G mobile communication system.

[0096] Optionally, the wearable device may also include a switching device disposed between the bandpass filter and the third ground point. The switching device can be used to select the bandpass filter corresponding to different resonances generated by the antenna structure, and the resonance point corresponding to the resonance generated by the antenna structure can be adjusted.

[0097] Figure 12 This is a schematic diagram of a feeding scheme for an antenna structure provided in an embodiment of this application.

[0098] like Figure 12 As shown, the power supply unit of the wearable device can be set on the PCB220 and electrically connected to the power supply point on the metal frame 210 through the spring contact 501.

[0099] Optionally, the spring 501 can be directly electrically connected to each power supply point, or it can be coupled power supply. This application does not impose any limitations on this comparison.

[0100] It should be understood that the technical solution provided in this application embodiment can also be applied to the grounding structure of an antenna structure, connecting it to ground via a spring contact. Alternatively, the spring contact can also be used to electrically connect various electronic components on a PCB to a metal frame.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical or other forms.

[0102] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wearable device, characterized in that, include: Printed circuit board (PCB) and antenna structure; The antenna structure includes at least a portion of a metal frame and a first feeding unit; A gap is formed between the metal frame and the PCB; The metal frame includes a first power supply point, a first grounding point, and a second grounding point, and the metal frame is grounded at the first grounding point and the second grounding point; The metal frame is divided into a first region and a second region by the first grounding point and the second grounding point, and the circumferential length of the first region is greater than the circumferential length of the second region. The first power supply point is located in the first area, and relative to the second grounding point, the first power supply point is closer to the first grounding point; The first power supply unit is used to supply power at the first power supply point, and the first region between the first grounding point and the second grounding point is used to generate a first resonance, a second resonance, and a third resonance; wherein the first grounding point and the second grounding point are both corresponding to the current strength points under the first resonance, the second resonance, and the third resonance.

2. The wearable device according to claim 1, characterized in that, The frequency of the resonant point of the first resonance is less than the frequency of the resonant point of the second resonance, and the frequency of the resonant point of the second resonance is less than the frequency of the resonant point of the third resonance.

3. The wearable device according to claim 2, characterized in that, The operating frequency band of the antenna structure corresponding to the second resonance covers the GPS frequency band.

4. The wearable device according to claim 2, characterized in that, The operating frequency band of the antenna structure corresponding to the first resonance covers 698MHz-960MHz, the operating frequency band of the antenna structure corresponding to the second resonance covers 1710MHz-2170MHz, and the operating frequency band of the antenna structure corresponding to the third resonance covers 2300MHz to 2690MHz.

5. The wearable device according to claim 1, characterized in that, The distance between the first power supply point and the first grounding point along the metal frame is less than one-third of the circumferential length corresponding to the first region.

6. The wearable device according to claim 1, characterized in that, The wearable device also includes a bandpass filter; The metal frame also includes a third grounding point, which is located in the first region, between the first power supply point and the second grounding point; One end of the bandpass filter is electrically connected to the metal frame at the third grounding point, and the other end is grounded.

7. The wearable device according to claim 6, characterized in that, The operating frequency band of the bandpass filter covers the operating frequency band of the antenna structure corresponding to the third resonance.

8. The wearable device according to claim 6, characterized in that, The bandpass filter is capacitive in the operating frequency band of the antenna structure corresponding to the first resonance or the operating frequency band of the antenna structure corresponding to the second resonance.

9. The wearable device according to claim 7, characterized in that, The bandpass filter operates in a frequency band covering 2300MHz to 2690MHz.

10. The wearable device according to claim 6, characterized in that, The distance between the third grounding point and the first grounding point along the metal frame is one-third of the circumferential length corresponding to the first region.

11. The wearable device according to claim 1, characterized in that, The circumferential length of the first region is between 120mm and 90mm.

12. The wearable device according to claim 1, characterized in that, The ratio of the circumferential length of the first region to the circumferential length of the metal frame is in the range of 0.7 to 0.

8.

13. The wearable device according to claim 1, characterized in that, The angle of the central angle corresponding to the first region is between 288° and 252°.

14. The wearable device according to claim 1, characterized in that, When the first resonance is generated, the antenna structure operates in half-wavelength mode; when the second resonance is generated, the antenna structure operates in one-wavelength mode; and when the third resonance is generated, the antenna structure operates in three-half-wavelength mode.

15. The wearable device according to claim 14, characterized in that, In the half-wavelength mode, the antenna structure has two strong current points, corresponding to the first grounding point and the second grounding point, respectively.

16. The wearable device according to claim 14, characterized in that, In the single-wavelength mode, the antenna structure has three strong current points, corresponding to the first ground point and the second ground point, respectively, and a first strong current point located between the first ground point and the second ground point.

17. The wearable device according to claim 14, characterized in that, In the three-half wavelength mode, the antenna structure has four strong current points, corresponding to the first ground point and the second ground point, and a second strong current point and a third strong current point located between the first ground point and the second ground point.

18. The wearable device according to claim 1, characterized in that, The antenna structure is a slot antenna.

19. The wearable device according to claim 1, characterized in that, The antenna structure further includes a second feeding unit, and the metal frame further includes a second feeding point. The second feeding point is disposed in the first region and located between the first feeding point and the second grounding point. The second feeding unit feeds power at the second feeding point.

20. The wearable device according to claim 1, characterized in that, The wearable device further includes at least one tuning device, which is disposed at the first grounding point or the second grounding point.

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