Wearable device

Abstract

Embodiments of this application provide a wearable device. The wearable device includes a conductive side frame and a metal member. A first feed point is disposed on the side frame, so that at least a part of the side frame is used as an antenna radiator. The side frame includes a first protrusion portion. A first metal member is coupled to the first protrusion portion, to improve antenna performance.

Description

[0001] This application claims priority to Chinese Patent Application No. 202310086337.8, filed with the China National Intellectual Property Administration on January 17, 2023 and entitled "WEARABLE DEVICE", which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates to the field of wireless communication, and in particular, to a wearable device.BACKGROUND

[0003] With development of mobile communication technologies, a wearable device may be configured to monitor health-related data, for example, a heartbeat and a sleep status of a human body at any time, and connect to an internet by using a communication function, to complete data synchronization. The wearable device may also obtain information, for example, weather and a temperature.

[0004] Important application of the wearable device is inseparable from a communication function, and one or more antennas are required to transmit or receive an electromagnetic signal. However, with development of wearable devices, under a development trend of a large screen-to-body ratio and overall lightness and thinness, a design environment of a built-in antenna, a conformal antenna, or an external antenna is more severe. The built-in antenna, the conformal antenna, or the external antenna is defined, based on that a radiator of the antenna is disposed inside the main body, outside the main body, or conformal to the main body relative to a main body of the wearable device. For example, for a watch, a radiator of a built-in antenna is usually disposed inside a housing of a watch main body, a clearance area of the built-in antenna is limited, and radiation performance is challenged. For another example, a radiator of a conformal antenna is usually disposed by using a housing of a watch main body, and the conformal antenna is limited by an appearance design of a product, for example, both space and dimensions of a product mechanical part bring a challenge to an antenna design. For another example, a radiator of an external antenna is usually disposed outside a housing of a watch main body, for example, the radiator is disposed by using a watch band, to obtain a good radiation environment. However, using a component close to a human body as the radiator of the antenna makes antenna performance sharply deteriorate. How to improve antenna performance of a wearable device and meet a requirement of a communication function in very small clearance is an urgent problem to be resolved.SUMMARY

[0005] Embodiments of this application provide a wearable device. In an original antenna layout of the wearable device, radiation performance of an antenna is improved by using an external metal member.

[0006] According to a first aspect, a wearable device is provided, including: a conductive side frame, where a first feed point is disposed on the side frame, and the side frame includes a first protrusion portion; a first antenna, including a first radiator and a first feed circuit, where the first radiator includes at least a part of the side frame, the first feed circuit is coupled to the first feed point, and an operating frequency band of the first antenna includes a first frequency band; and a first metal member, where the first metal member is coupled to the first protrusion portion, a dimension of the first metal member is less than a quarter of a first wavelength, and the first wavelength is a wavelength corresponding to the first frequency band. In an embodiment, a dimension of the first metal member in a direction away from the first protrusion portion is less than a quarter of the first wavelength. In an embodiment, a dimension of the first metal member in a direction away from the first protrusion portion is less than one eighth of the first wavelength.

[0007] It should be understood that, the metal member in this embodiment of this application may be understood as a component made of a conductive material, and may be a component made of a metal or a component made of a conductive non-metal, for example, graphene. This is not limited in this embodiment of this application.

[0008] According to the technical solutions in this embodiment of this application, no fracture is provided on the first radiator and two ends of the first radiator. A slit is formed between the side frame portion used as the first radiator and a ground plane, to be used as a radiation slit of a slot antenna. The first metal member is coupled to an outer side (a side away from the ground plane) of the slit formed between the side frame and the ground plane, and a width of a metal outside the slit may be partially extended at the first protrusion portion, so that a radiation aperture of the first antenna may be extended, to improve radiation performance (for example, a bandwidth and efficiency) of the first antenna.

[0009] In this embodiment of this application, the first metal member may be configured to adjust radiation performance of the first antenna, so that radiation performance of the first antenna in a resonance frequency band or the operating frequency band is improved. The first metal member is not configured to generate additional resonance.

[0010] With reference to the first aspect, in some implementations of the first aspect, the side frame includes a first side frame portion, and the first protrusion portion protrudes from an outer surface of the first side frame portion; and the first radiator includes at least a part of the first side frame portion.

[0011] With reference to the first aspect, in some implementations of the first aspect, the wearable device further includes a first wristband, and the first wristband includes a non-metal portion; and a first end of the non-metal portion of the first wristband is connected to the first protrusion portion, and the first metal member is wrapped in the non-metal portion of the first wristband; or one end of the first metal member is connected to the first protrusion portion, and the other end of the first metal member is connected to the non-metal portion of the first wristband.

[0012] According to the technical solutions in this embodiment of this application, when the first wristband may include the non-metal (for example, an insulation) portion, for example, made of a non-metal material, for example, leather, rubber, or silicone, the first metal member may be wrapped in the non-metal portion of the first wristband. It should be understood that the first metal member may be disposed inside the first wristband. The metal member disposed inside cannot be seen on an appearance surface of the wristband, so that appearance uniformity of the wristband can be increased, and the wristband is more beautiful.

[0013] When the first wristband of the wearable device is of a metal architecture (the first wristband 361 may include the non-metal portion), because two ends of the first wristband are respectively rotatably connected to the first protrusion portion and a second protrusion portion, and are close to the side frame, when the first antenna is formed between the side frame and the ground plane and operates, a large amount of energy is coupled. A part of energy radiated by the first antenna is introduced to the first wristband. As a result, radiation performance of the first antenna is reduced (for example, a gain is reduced, or efficiency is reduced). According to the technical solutions in this embodiment of this application, a first link that is in the first wristband and that is connected to the first protrusion portion is set to be made of a metal material, and a second link that is connected to the first link is set to be made of a non-metal material, so that a part of energy radiated by the first antenna can be coupled only to the first link, to avoid a performance loss of the first antenna. In addition, according to the foregoing technical solutions, the metal member is coupled on a side of the slit of the first antenna, so that radiation performance of the first antenna can be further improved.

[0014] With reference to the first aspect, in some implementations of the first aspect, the wearable device further includes a first connection member, two ends of the first connection member are connected to the first protrusion portion, and the first wristband is rotatably connected to the first protrusion portion through the first connection member; and the first metal member is coupled to the first connection member.

[0015] According to the technical solutions in this embodiment of this application, for brevity of description, an example in which the first metal member is electrically connected to the first protrusion portion of the side frame through the first protrusion portion is merely used for description. During actual application, the first metal member may alternatively be electrically connected to the side frame through a fastener or the like.

[0016] With reference to the first aspect, in some implementations of the first aspect, a dimension L1 of the first metal member in a first direction is greater than or equal to 8 mm, where the first direction is an extension direction of a coupling position between the first metal member and the first protrusion portion.

[0017] According to the technical solutions in this embodiment of this application, the dimension L1 of the first metal member in the first direction may be approximately the same as a width L2 of the first wristband. For example, L1 and L2 may satisfy that L2>L1≥L2×80%. As the dimension L1 of the first metal member in the first direction increases, radiation performance (for example, efficiency) of the first antenna may be further improved.

[0018] With reference to the first aspect, in some implementations of the first aspect, a dimension D1 of the first metal member in a second direction is less than or equal to 10 mm, where the second direction is perpendicular to the first direction.

[0019] In an embodiment, the first direction may be a width direction of the metal member (for example, consistent with a width direction of the wristband), and the second direction may be a length direction of the metal member (for example, consistent with a length direction of the wristband).

[0020] According to the technical solutions in this embodiment of this application, when a user wears the wearable device on a wrist, because the wrist is a curved surface, and a rear cover of the wearable device is of a planar structure, the wearable device and the wrist of the user cannot completely overlap, and a gap is generated at a joint between the first wristband and a main body of the wearable device. For a high-frequency signal, for example, a signal in a receive frequency band (2483.5 MHz to 2500 MHz) in a BeiDou system and 2.4 GHz Wi-Fi and BT frequency bands, a human body has large impact on an electrical signal in the frequency band (strength of absorbing the electrical signal is excessively high), resulting in poor radiation performance of the first antenna in the frequency band. Therefore, by using the gap, the dimension D1 of the first metal member in the second direction may be less than or equal to 10 mm, so that the metal member can prevent the wrist of the user from absorbing an electromagnetic wave on the metal member, to improve radiation performance of the first antenna.

[0021] With reference to the first aspect, in some implementations of the first aspect, the dimension D1 of the first metal member in the second direction is less than or equal to 9 mm and greater than or equal to 6 mm. With reference to the first aspect, in some implementations of the first aspect, the dimension L1 of the first metal member in the first direction is greater than or equal to 10 mm, so that radiation performance of the antenna may be improved to some extent.

[0022] With reference to the first aspect, in some implementations of the first aspect, the side frame includes a second protrusion portion; and the wearable device includes a second metal member, the second metal member is coupled to the second protrusion portion, and a dimension of the second metal member is less than a quarter of the first wavelength.

[0023] With reference to the first aspect, in some implementations of the first aspect, the side frame includes a second side frame portion, and the second protrusion portion protrudes from an outer surface of the second side frame portion; and the first radiator includes at least a part of the second side frame portion.

[0024] With reference to the first aspect, in some implementations of the first aspect, a dimension L2 of the second metal member in a first direction is greater than or equal to 8 mm, where the first direction is an extension direction of a coupling position between the first metal member and the first protrusion portion.

[0025] According to the technical solutions in this embodiment of this application, the dimension L3 of the second metal member in the first direction may be approximately the same as a width L4 of a second wristband. For example, L3 and L4 may satisfy that L3≥L4×80%.

[0026] With reference to the first aspect, in some implementations of the first aspect, the dimension L3 of the second metal member in the first direction is greater than or equal to 10 mm, so that radiation performance of the antenna may be improved to some extent.

[0027] With reference to the first aspect, in some implementations of the first aspect, a dimension D2 of the second metal member in a second direction is less than or equal to 10 mm, where the second direction is perpendicular to the first direction.

[0028] In an embodiment, the first direction may be a width direction of the metal member (for example, consistent with a width direction of the wristband), and the second direction may be a length direction of the metal member (for example, consistent with a length direction of the wristband).

[0029] With reference to the first aspect, in some implementations of the first aspect, the dimension D2 of the second metal member in the second direction is less than or equal to 9 mm and greater than or equal to 6 mm.

[0030] With reference to the first aspect, in some implementations of the first aspect, a first ground point is disposed on the side frame, the first ground point is configured to ground the side frame, and the first ground point and the first feed point divide the side frame into two parts with different lengths.

[0031] With reference to the first aspect, in some implementations of the first aspect, a second ground point different from the first ground point is disposed on the side frame, the second ground point is configured to ground the side frame, the first radiator includes a third side frame portion between the first ground point and the second ground point, and the first feed point is disposed on the third side frame portion.

[0032] With reference to the first aspect, in some implementations of the first aspect, a position of the first protrusion portion on the side frame at least partially falls on the third side frame portion, and is located between the first ground point and the first feed point.

[0033] According to the technical solutions in this embodiment of this application, the first metal member may extend widths that are of metals on two sides of the slit and that are in an area close to an electric field strong point of the first antenna, so that radiation performance of the first antenna is improved more obviously.

[0034] With reference to the first aspect, in some implementations of the first aspect, a position of the second protrusion portion on the side frame at least partially falls on the third side frame portion, and is located between the second ground point and the first feed point.

[0035] According to the technical solutions in this embodiment of this application, the second metal member may extend widths that are of metals on two sides of the slit and that are in an area close to an electric field strong point of the first antenna, so that radiation performance of the first antenna is improved more obviously.

[0036] With reference to the first aspect, in some implementations of the first aspect, the wearable device further includes a second antenna, and a second feed point is disposed on the side frame; the second antenna includes a second feed circuit, and the second feed circuit is coupled to the second feed point; and the side frame is divided into the third side frame portion and a fourth side frame portion by the first ground point and the second ground point, the first feed point is located on the third side frame portion, and the second feed point is located on the fourth side frame portion.

[0037] The technical solutions according to this embodiment of this application may be applied to a wearable device in a dual-antenna architecture.

[0038] With reference to the first aspect, in some implementations of the first aspect, the operating frequency band of the first antenna includes the first frequency band and a second frequency band, and a frequency of the first frequency band is lower than a frequency of the second frequency band; the wearable device includes a third metal member, the first metal member is located between the third metal member and the first protrusion portion, and the third metal member and the first metal member are spaced apart; the wearable device further includes a filtering structure, and the filtering structure is coupled between the first metal member and the third metal member; and the first radiator and the first metal member are configured to generate first resonance, the first radiator, the first metal member, and the second metal member are configured to generate second resonance, a resonance frequency band of the second resonance includes the first frequency band, and a resonance frequency band of the first resonance includes the second frequency band.

[0039] According to the technical solutions in this embodiment of this application, the filtering structure may be a low-pass and high-impedance low-pass filter, so that the first metal member and the third metal member are electrically connected to each other in the low-frequency first frequency band and disconnected in the high-frequency second frequency band. Because a first filter is disposed between the first metal member and the third metal member, when the first slot antenna operates in different frequency bands, lengths of loaded metal members may be different, and the metal members may be flexibly applicable to different communication frequency bands, to improve performance of different communication frequency bands. For example, when the first slot antenna operates in a low frequency band (the first frequency band), a corresponding operating wavelength is long, and a length of a metal on an outer side of a slit formed between the third side frame portion and the ground plane is long. When the first slot antenna operates in a high frequency band (the second frequency band), a corresponding operating wavelength is short, and a length of a metal on an outer side of a slit formed between the third side frame portion and the ground plane is short. The first frequency band may include at least a part of frequency bands from 700 MHz to 1176 MHz. The first frequency band may include at least a part of frequency bands from 700 MHz to 960 MHz. The second frequency band may include at least a part of frequency bands from 1575 MHz to 2690 MHz.

[0040] With reference to the first aspect, in some implementations of the first aspect, the filtering structure includes an inductor member and a capacitor member, a first end of the inductor member is electrically connected to the third metal member, a second end of the inductor member is electrically connected to the capacitor member, the capacitor member and the first metal member are spaced apart in a third direction, the capacitor member and the first metal member at least partially overlap in the third direction, and the third direction is a direction perpendicular to a plane on which the first metal member is located.

[0041] According to the technical solutions in this embodiment of this application, the filtering structure may include a distributed component, or may include a lumped component, or may include a combination of a distributed component and a lumped component. This is not limited in this embodiment of this application, and may be adjusted based on actual production or design.

[0042] With reference to the first aspect, in some implementations of the first aspect, the side frame is in a ring shape, and an inner diameter is between 35 mm and 50 mm.

[0043] With reference to the first aspect, in some implementations of the first aspect, no insulation fracture is provided on the side frame.

[0044] According to the technical solutions in this embodiment of this application, because no insulation fracture is provided on the side frame, integrity of a metal appearance is maintained, and structural stability and aesthetics of the wearable device are improved.

[0045] With reference to the first aspect, in some implementations of the first aspect, the first protrusion portion is a lug on the side frame.

[0046] With reference to the first aspect, in some implementations of the first aspect, a wristband of the wearable device includes a link, and the first metal member includes at least a part of the link.BRIEF DESCRIPTION OF DRAWINGS

[0047] FIG. 1 is a diagram of a wearable device 100 according to an embodiment of this application; FIG. 2 is a partial diagram of a wearable device 100; FIG. 3 is a diagram of a slot antenna 200 according to an embodiment of this application; FIG. 4 is a diagram of another slot antenna 200 according to an embodiment of this application; FIG. 5 is a diagram of S parameters of slot antennas 200 shown in FIG. 3 and FIG. 4; FIG. 6 shows simulation results of total efficiency of slot antennas 200 shown in FIG. 3 and FIG. 4; FIG. 7 is a diagram of increasing a width of a metal layer in a part of the slot antenna 200 shown in FIG. 3; FIG. 8 is a diagram of increasing a width of a metal layer in a part of the slot antenna 200 shown in FIG. 3; FIG. 9 is a diagram of S parameters of slot antennas 200 shown in FIG. 7 and FIG. 8; FIG. 10 shows simulation results of total efficiency of slot antennas 200 shown in FIG. 7 and FIG. 8; FIG. 11 is a diagram of current distribution of a slot antenna 200; FIG. 12 is a diagram of electric field distribution of a slot antenna 200; FIG. 13 is a diagram of a wearable device 300 according to an embodiment of this application; FIG. 14 is a diagram of a wearable device 300 according to an embodiment of this application; FIG. 15 is a side view of a wearable device 300 according to an embodiment of this application; FIG. 16 is a side view of another wearable device 300 according to an embodiment of this application; FIG. 17 is a diagram of wearing a wearable device by a user according to an embodiment of this application; FIG. 18 shows simulation results of an S parameter and total efficiency of a first antenna shown in FIG. 13; FIG. 19 shows a simulation result of total efficiency improved by a first antenna shown in FIG. 13 at each frequency; FIG. 20 is a diagram of a wearable device 300 according to an embodiment of this application; FIG. 21 is a diagram of a wearable device 300 according to an embodiment of this application; FIG. 22 is a partial diagram of a wearable device 300 according to an embodiment of this application; FIG. 23 is a side view of a first metal member and a third metal member according to an embodiment of this application; FIG. 24 shows a simulation result of total efficiency of a first antenna in the wearable device shown in FIG. 20; and FIG. 25 shows a simulation result of total efficiency of a second antenna in the wearable device shown in FIG. 20. DESCRIPTION OF EMBODIMENTS

[0048] The technical solutions provided in embodiments of this application are applicable to UE that uses one or more of the following communication technologies: a Bluetooth (Bluetooth, BT) communication technology, a global positioning system (global positioning system, GPS) communication technology, a wireless fidelity (wireless fidelity, Wi-Fi) communication technology, a global system for mobile communications (global system for mobile communications, GSM) communication technology, a wideband code division multiple access (wideband code division multiple access, WCDMA) communication technology, a long term evolution (long term evolution, LTE) communication technology, a 5G communication technology, another future communication technology, and the like.

[0049] The following explains terms that may appear in embodiments of this application.

[0050] Coupling: The coupling may be understood as direct coupling and / or indirect coupling, and a "coupling connection" may be understood as a direct coupling connection and / or an indirect coupling connection. The direct coupling may also be referred to as an "electrical connection", which may be understood as physical contact and electrical conduction of components, or may be understood as a form of connection between different components in a line structure through a physical line that can transmit an electrical signal, for example, a printed circuit board (printed circuit board, PCB) copper foil or a conducting wire. The "indirect coupling" may be understood as electrical conduction of two conductors in a spaced / non-contact manner. In an embodiment, the indirect coupling may also be referred to as capacitive coupling. For example, signal transmission is implemented by forming an equivalent capacitor through coupling in a gap between two spaced conductive members.

[0051] Connection / being connected to: The connection / being connected to may mean a mechanical connection relationship or a physical connection relationship, for example, a connection between A and B or that A is connected to B may mean that there is a fastening component (for example, a screw, a bolt, or a rivet) between A and B, or A and B are in contact with each other and A and B are difficult to be separated.

[0052] Connected: That two or more components are conducted or connected in the foregoing "electrical connection" or "indirect coupling" manner to perform signal / energy transmission may be referred to as being connected.

[0053] Lumped element / component: The lumped element / component is a general name of all elements whose dimensions are far less than a wavelength corresponding to an operating frequency of a circuit. For a signal, a characteristic of the element is constant at any time, regardless of a frequency.

[0054] Distributed element / component: A difference between the distributed element and a lumped element lies in that if dimensions of an element are close to or greater than a wavelength corresponding to an operating frequency of a circuit, a characteristic of each point of the element varies with a signal when the signal passes through the element. In this case, the element cannot be considered as a single entity with a constant characteristic, but needs to be referred to as a distributed element.

[0055] Capacitor: The capacitor may be understood as a lumped capacitor and / or a distributed capacitor. The lumped capacitor is a capacitive component, for example, a capacitive element. The distributed capacitor (or a distributed type capacitor) is an equivalent capacitor formed by two conductive members that are spaced apart by a specific gap.

[0056] Inductor: The inductor may be understood as a lumped inductor and / or a distributed inductor. The lumped inductor is an inductive component, for example, an inductive element. The distributed inductor (or distributed type inductor) is an equivalent inductor formed by a conductive member with a specific length.

[0057] Radiator: The radiator is an apparatus configured to receive / send electromagnetic wave radiation in an antenna. In some cases, an "antenna" is understood as a radiator in a narrow sense. The antenna converts guided wave energy from a transmitter into a radio wave, or converts a radio wave into guided wave energy to radiate and receive a radio wave. Modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted to a transmit radiator through a feeder. The radiator converts the energy into specific polarized electromagnetic wave energy and radiates the energy in a required direction. A receive radiator converts specific polarized electromagnetic wave energy from a specific direction of space into modulated high-frequency current energy, and transmits the modulated high-frequency current energy to an input end of a receiver through a feeder.

[0058] The radiator may include a conductor with a specific shape and dimensions, for example, a linear radiator or a sheet-shaped radiator. A specific shape is not limited in this application. In an embodiment, the linear radiator may be referred to as a wire antenna for short. In an embodiment, the linear radiator may be implemented by a conductive side frame, and may also be referred to as a side frame antenna. In an embodiment, the linear radiator may be implemented by a bracketed conductor, and may also be referred to as a bracketed antenna. In an embodiment, a wire diameter (for example, including a thickness and a width) of the linear radiator or a radiator of the wire antenna is far less than a wavelength (for example, a medium wavelength) (for example, is less than 1 / 16 of the wavelength), and a length may be compared with the wavelength (for example, the medium wavelength) (for example, the length is approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4 of the wavelength, or 1 / 4 to 1 / 2 of the wavelength, or greater). Main forms of the wire antenna include the following: a dipole antenna, a half-wave dipole antenna, a monopole antenna, a loop antenna, an inverted F antenna (also referred to as an IFA, inverted F Antenna), and a planar inverted F antenna (also referred to as a PIFA, Planar Inverted F Antenna). For example, for the dipole antenna, each dipole antenna usually includes two radiation stubs, and each stub is fed by a feed portion from a feed end of the radiation stub. For example, the inverted F antenna (Inverted F Antenna, IFA) may be considered as being obtained by adding a ground path to a monopole antenna. The IFA has a feed point and a ground point, and is referred to as the inverted F antenna because a side view of the IFA is in an inverted F shape. In an embodiment, the sheet-shaped radiator may include a microstrip antenna or a patch (patch) antenna. In an embodiment, the sheet-shaped radiator may be implemented by a planar conductor (for example, a conductive sheet or a conductive coating). In an embodiment, the sheet-shaped radiator may include a conductive sheet, for example, a copper sheet. In an embodiment, the sheet-shaped radiator may include a conductive coating, for example, silver paste. A shape of the sheet-shaped radiator includes a circular shape, a rectangular shape, a ring shape, and the like. A specific shape is not limited in this application. A structure of the microstrip antenna usually includes a dielectric substrate, a radiator, and a ground plane, where the dielectric substrate is disposed between the radiator and the ground plane.

[0059] The radiator may also include a slot or a slit formed on a conductor, for example, a closed or semi-closed slot or slit formed on a grounded conductor surface. In an embodiment, a radiator with a slot or a slit may be referred to as a slot antenna or a slotted antenna for short. In an embodiment, a radiator with a closed slot or slit may be referred to as a closed slot antenna for short. In an embodiment, a radiator with a semi-closed slot or slit (for example, an opening is additionally provided on the closed slot or slit) may be referred to as an open slot antenna for short. In some embodiments, the slit is long strip-shaped. In some embodiments, a length of the slit is approximately half the wavelength (for example, the medium wavelength). In some embodiments, a length of the slit is approximately an integer multiple of the wavelength (for example, one medium wavelength). In some embodiments, the slit may be used for feeding through a transmission line bridged on one side or two sides of the slit. In this way, a radio frequency electromagnetic field is excited on the slit, and an electromagnetic wave is radiated to space. In an embodiment, a radiator of the slot antenna or the slotted antenna may be implemented by a conductive side frame that is grounded at two ends, and may also be referred to as a side frame antenna. In this embodiment, it may be considered that the slot antenna or the slotted antenna includes a linear radiator, and the linear radiator is spaced apart from the ground plane and is grounded at two ends of the radiator, to form a closed or semi-closed slot or slit. In an embodiment, the radiator of the slot antenna or the slotted antenna may be implemented by a bracketed conductor that is grounded at two ends, and may also be referred to as a bracketed antenna.

[0060] A feed unit / feed circuit / feed structure is a combination of all components of an antenna for receiving and transmitting radio frequency waves. In a case of a receive antenna, the feed unit may be considered as an antenna part from a first amplifier to a front-end transmitter. In a transmit antenna, the feed unit may be considered as a part after a last power amplifier. In some cases, the "feed unit" is understood in a narrow sense as a radio frequency chip, or includes a transmission path from a radio frequency chip to a radiator or a feed point on a transmission line. The feed unit has a function of converting a radio wave into an electrical signal and sending the electrical signal to a receiver component. Usually, the feed unit is considered as a part of the antenna, and is configured to convert a radio wave into an electrical signal, and vice versa. When the antenna is designed, maximum power transmission possibility and efficiency need to be considered. Therefore, a feed impedance of the antenna shall match a load resistance. The feed impedance of the antenna is a combination of a resistance, a capacitance, and an inductance. To ensure a maximum power transmission condition, two impedances (the load resistance and the feed impedance) need to match. The matching can be completed by considering a frequency requirement and a design parameter (for example, a gain, directivity, and radiation efficiency) of the antenna.

[0061] Resonance frequency: The resonance frequency is also referred to as a resonant frequency. The resonance frequency may be a frequency at which an imaginary part of an input impedance of an antenna is zero. The resonance frequency may have a frequency range, namely, a frequency range in which resonance occurs. A frequency corresponding to a strongest resonance point is a center frequency. A return loss characteristic of the center frequency may be less than -20 dB.

[0062] Resonance frequency band / communication frequency band / operating frequency band: Regardless of a type of antenna, the antenna always operates in a specific frequency range (a frequency band width). For example, an operating frequency band of an antenna supporting a B40 frequency band includes a frequency ranging from 2300 MHz to 2400 MHz. In other words, the operating frequency band of the antenna includes the B40 frequency band. A frequency range that meets a requirement of an indicator may be considered as an operating frequency band of an antenna.

[0063] Wavelength: The wavelength or an operating wavelength, may be a wavelength corresponding to a center frequency of a resonance frequency or a center frequency of an operating frequency band supported by an antenna. For example, it is assumed that a center frequency of a B1 uplink frequency band (with a resonance frequency ranging from 1920 MHz to 1980 MHz) is 1955 MHz. In this case, an operating wavelength may be a wavelength calculated by using the frequency of 1955 MHz. The "operating wavelength" is not limited to the center frequency, and may alternatively be a wavelength corresponding to a non-center frequency of the resonance frequency or the operating frequency band.

[0064] It should be understood that a wavelength of a radiation signal in the air may be calculated as follows: (Air wavelength or vacuum wavelength)=Speed of light / Frequency, where the frequency is a frequency (MHz) of the radiation signal, and the speed of light may be 3×108 m / s. A wavelength of the radiation signal in a medium may be calculated as follows: Medium wavelength = Speed of light / ε / Frequency, where ε is a relative dielectric constant of the medium. The wavelength in embodiments of this application is usually a medium wavelength, and may be a medium wavelength corresponding to a center frequency of a resonance frequency, or a medium wavelength corresponding to a center frequency of an operating frequency band supported by an antenna. For example, it is assumed that a center frequency of a B1 uplink frequency band (with a resonance frequency ranging from 1920 MHz to 1980 MHz) is 1955 MHz. In this case, a wavelength may be a medium wavelength calculated by using the frequency of 1955 MHz. The "medium wavelength" is not limited to that for the center frequency, and may alternatively be a medium wavelength corresponding to a non-center frequency of the resonance frequency or the operating frequency band. For ease of understanding, the medium wavelength mentioned in embodiments of this application may be simply calculated by using a relative dielectric constant of a medium filled in one or more sides of a radiator.

[0065] The limitations such as parallel, vertical, and same (for example, a same length and a same width) mentioned in embodiments of this application are all for a present process level, but are not absolutely strict definitions in a mathematical sense. A deviation of a preset angle (for example, ±5°, ±10°) may exist between two antenna elements that are parallel or perpendicular to each other.

[0066] Total efficiency (total efficiency) of an antenna: The total efficiency of the antenna is a ratio of input power to output power at an antenna port.

[0067] Radiation efficiency (radiation efficiency) of an antenna: The radiation efficiency of the antenna is a ratio of power radiated by the antenna to space (namely, power for effectively converting an electromagnetic wave) to active power input to the antenna. Active power input to the antenna=Input power of the antenna-Loss power. The loss power mainly includes return loss power and metal ohmic loss power and / or dielectric loss power. The radiation efficiency is a value for measuring a radiation capability of an antenna. Both a metal loss and a dielectric loss are factors that affect the radiation efficiency.

[0068] A person skilled in the art may understand that efficiency is usually indicated by a percentage, and there is a corresponding conversion relationship between the efficiency and dB. Efficiency closer to 0 dB indicates better efficiency of the antenna.

[0069] Antenna return loss: The antenna return loss may be understood as a ratio of power of a signal reflected back to an antenna port through an antenna circuit to transmit power of the antenna port. A smaller reflected signal indicates a larger signal radiated by an antenna to space and higher radiation efficiency of the antenna. A larger reflected signal indicates a smaller signal radiated by the antenna to space and lower radiation efficiency of the antenna.

[0070] The antenna return loss may be indicated by an S11 parameter, and S11 is one of S parameters. S11 indicates a reflection coefficient, and the parameter can indicate transmit efficiency of an antenna. In an embodiment, an S11 diagram may be understood as a diagram of resonance generated by an antenna. In an embodiment, a part that is of the resonance shown in the S11 diagram and that is less than -6 dB may be understood as a resonance frequency / a frequency range / an operating frequency band generated by the antenna. The S11 parameter is usually a negative number. A smaller S11 parameter indicates a smaller antenna return loss, less energy reflected back by the antenna, namely, more energy that actually enters the antenna, and higher total efficiency of the antenna. A larger S11 parameter indicates a larger antenna return loss and lower total efficiency of the antenna.

[0071] It should be noted that, an S11 value of -6 dB is usually used as a standard in engineering. When an S11 value of the antenna is less than -6 dB, it may be considered that the antenna can operate normally, or it may be considered that transmit efficiency of the antenna is high.

[0072] Isolation: The isolation is a ratio of a signal that is transmitted by an antenna and received by another antenna to a signal of the transmit antenna. The isolation is a physical quantity for measuring a degree of mutual coupling between antennas. If two antennas form a dual-port network, isolation between the two antennas is S21 and S12 for the antennas. The isolation between the antennas may be indicated by parameters S21 and S12, and the parameters S21 and S12 are also one of S parameters. The parameters S21 and S12 are usually negative numbers. Smaller parameters S21 and S12 indicate higher isolation between the antennas and a lower degree of mutual coupling between the antennas. Larger parameters S21 and S12 indicate lower isolation between the antennas and a higher degree of mutual coupling between the antennas. The isolation between the antennas depends on an antenna radiation pattern, a spatial distance between the antennas, an antenna gain, and the like.

[0073] Ground (ground plane): The ground (the ground plane) may generally be at least a part of any ground layer, ground plate, ground metal layer, or the like in an electronic device (for example, a mobile phone), or at least a part of any combination of any ground layer, ground plate, ground part, or the like. The "ground" may be configured to ground a component in the electronic device. In an embodiment, the "ground" may be a ground layer of a circuit board of an electronic device, or may be a ground plate formed by a middle frame of an electronic device or a ground metal layer formed by a metal film below a screen of an electronic device. In an embodiment, the circuit board may be a printed circuit board (printed circuit board, PCB), for example, an 8-layer, 10-layer, or 12-layer to 14-layer board with 8, 10, 12, 13, or 14 layers of conductive materials, or an element that is separated and electrically insulated by a dielectric layer or an insulation layer, for example, a glass fiber or a polymer. In an embodiment, the circuit board includes a dielectric substrate, a ground layer, and a wiring layer. The wiring layer and the ground layer are electrically connected through a via. In an embodiment, components such as a display, a touchscreen, an input button, a transmitter, a processor, a memory, a battery, a charging circuit, and a system on chip (system on chip, SoC) structure may be mounted on or connected to the circuit board, or electrically connected to the wiring layer and / or the ground layer in the circuit board. For example, a radio frequency source is disposed on the wiring layer.

[0074] Any ground layer, ground plate, or ground metal layer is made of a conductive material. In an embodiment, the conductive material may be any one of the following materials: copper, aluminum, stainless steel, brass and alloys thereof, copper foils on insulation laminates, aluminum foils on insulation laminates, gold foils on insulation laminates, silver-plated copper, silver-plated copper foils on insulation laminates, silver foils on insulation laminates and tin-plated copper, cloth impregnated with graphite powder, graphite-coated laminates, copper-plated laminates, brass-plated laminates, and aluminum-plated laminates. A person skilled in the art may understand that the ground layer / ground plate / ground metal layer may alternatively be made of another conductive material.

[0075] Grounding: The grounding means coupling with the ground / ground plane in any manner. In an embodiment, the grounding may be grounding by using an entity, for example, grounding by using an entity (or referred to as entity grounding) at a specific position on a side frame is implemented by using some mechanical parts of a middle frame. In an embodiment, grounding may be grounding by using a component, for example, grounding by using components (or referred to as component grounding) such as capacitors / inductors / resistors connected in series or in parallel.

[0076] The following describes technical solutions of embodiments in this application with reference to accompanying drawings.

[0077] A wearable device provided in this application may be a portable device that can be integrated into clothes or an accessory of a user, has a computing function, and can be connected to a mobile phone and various terminal devices. For example, the wearable device may be a watch, a smart wristband, a portable music player, a health monitoring device, a computing or game device, a smart phone, an accessory, or the like. In some embodiments, the wearable device is a watch or a band that can be worn around a wrist of the user.

[0078] FIG. 1 is a diagram of a structure of a wearable device according to this application. In some embodiments, the wearable device may be a watch or a band.

[0079] Refer to FIG. 1. The wearable device 100 includes a main body 101 and one or more wristbands 102 (FIG. 1 shows a partial area of the wristband 102). The wristband 102 is fastened to the main body 101, and the wristband 102 may be wound around a wrist, an arm, a leg, or another part of a body, to fasten the wearable device to a user. As a central element of the wearable device 100, the main body 101 may include a metal side frame 180 and a screen 140. The metal side frame 180 may surround the main body of the wearable device, and surround the screen 140 as a part of an appearance of the wearable device.

[0080] In an embodiment, the wearable device may be a watch or a band, and the metal side frame 180 of the wearable device surrounds the screen 140 and a bezel 141. An edge of the bezel 141 is adjacent to and fastened to the metal side frame 180. The screen 140 may be disposed in space enclosed by the bezel 141. The screen 140 and the bezel 141 form a surface of the main body 101.

[0081] Although not shown in FIG. 1, in an embodiment, accommodation space is formed between the metal side frame 180 and the screen 140, so that a combination of a plurality of electronic components may be accommodated, to implement various functions of the wearable device 100. The main body 101 further includes an input device 120, a part of the input device 120 may be accommodated in the accommodation space between the metal side frame 180 and the screen 140, and an exposed part of the input device 120 is convenient for the user to operate.

[0082] It may be understood that, in this embodiment of this application, the metal side frame 180 of the wearable device may be in a circular shape, a square shape, or a polygonal shape, or may be in another regular or irregular shape. This is not limited herein. For brevity of description, the following embodiments are described by using a circular metal side frame 180 as an example. In an embodiment, the wearable device may be a watch or a band, and the metal side frame 180 may be in a ring shape, for example, may be in a circular ring shape, a rectangular (or square) ring shape, or another ring shape. It should be understood that when the side frame 310 is in a circular ring shape, an inner diameter may be understood as a shortest distance between a virtual center of a circle formed by the side frame and the side frame. When the side frame 310 is in a rectangular (or square) ring shape or another ring shape, an inner diameter may be understood as an inner diameter corresponding to an equivalent circular ring-shaped side frame that has a same circumference as the side frame.

[0083] In an embodiment, the screen 140 is used as a surface of the main body 101, and may be used as a protection plate of the main body 101, to prevent a component accommodated in the metal side frame 180 from being exposed and damaged. For example, the screen 140 may include a liquid crystal display (liquid crystal display, LCD) and a protection member covering a surface of the display. The protection member may be made of a sapphire crystal, glass, plastic, or another material.

[0084] In an embodiment, the bezel 141 is used as a surface of the main body 101, and may also protect a component in the main body 101. For example, the bezel 141 may be made of a ceramic material. This improves aesthetics while providing good protection for the main body 101.

[0085] The user may interact with the wearable device 100 by using the screen 140. For example, the screen 140 may receive an input operation of the user, and perform corresponding output in response to the input operation. For example, the user may choose to open or edit a graphic by touching or pressing a graphic position on the screen 140 (or in another manner).

[0086] The input device 120 is attached to an outer side of the metal side frame 180 and extends to the inside of the metal side frame 180. In some embodiments, the input device includes a head portion 121 and a rod portion 122 that are connected to each other. The rod portion 122 extends into the housing 180, and the head portion 121 is exposed outside the housing 180 and may be used as a part in contact with the user, to allow the user to be in contact with the input device. The head portion 121 is rotated, panned, tilted, or pressed, to receive an input operation of the user. When the user operates the head portion 121, the rod portion 122 may move with the head portion 121. It may be understood that the head portion 121 may be in any shape, for example, the head portion 121 may be in a cylindrical shape. It may be understood that a rotatable input device 120 may be referred to as a button. In an embodiment in which the wearable device 100 is a watch, the rotatable input device 120 may be a crown portion of the watch. The input device 120 may be referred to as a crown.

[0087] The wearable device 100 includes a key 1202. The key 1202 is an example of the input device 120, and may allow the user to press, move, or tilt the key 1202 to perform an input operation. For example, the key 1202 may be mounted on a side surface of the metal side frame 180, a part of the key 1202 is exposed, and the other part (not shown in the figure) extends from the side surface of the metal side frame 180 toward the inside of the housing 180. For example, the key 1202 may alternatively be disposed on a head portion 121 of a button 1201, and a pressing operation may also be performed when a rotation operation is performed. For example, the key 1202 may alternatively be disposed on a top surface that is of the main body 101 and on which the display 140 is mounted.

[0088] Still refer to FIG. 1. In some other embodiments, the wearable device 100 may include a button 1201 and a key 1202. The button 1201 and the key 1202 may be disposed on a same surface of the metal side frame 180, for example, both are disposed on a same side surface of the metal side frame 180. The button 1201 and the key 1202 may alternatively be disposed on different surfaces of the metal side frame 180. This is not limited in this application. It may be understood that the wearable device 100 may include one or more keys 1202, and may include one or more buttons 1201.

[0089] Still refer to FIG. 2. The metal side frame 180 extends toward an outer side of a main portion at a first position and a second position to form a protrusion portion. In an embodiment, the wearable device may be a watch or a band, and the metal side frame 180 is connected to the wristband 102 through the protrusion portion. In an embodiment, the protrusion portion may include a protrusion portion 181 and a protrusion portion 182, the protrusion portion 181 and the protrusion portion 182 may be used as a lug 183 of the wearable device 100, and the lug 183 may be configured to connect to the wristband 102.

[0090] As shown in FIG. 2, the wearable device 100 may further include a connection member 103, configured to connect the wristband 102 to the main body 101, for example, connect the wristband 102 to the main body 101 by connecting the wristband 102 to the protrusion portion 181 / 182. In an embodiment, the connection member 103 may be used as a spring bar 103 of the wearable device 100, and is configured to connect the wristband 102 to the main body 101. The spring bar 103 may include a telescopic first connection member 1031, a second connection member 1032, and a main portion 1033. The first connection member 1031 and the second connection member 1032 are respectively located at two ends of the main portion 1033, and the main portion 1033 is located in a hole of an end portion of the wristband 102. A length of the main portion 1033 is approximately the same as a distance between the protrusion portion 181 and the protrusion portion 182. The first connection member 1031 may be configured to rotatably connect to the protrusion portion 181, and the second connection member 1032 may be configured to rotatably connect to the protrusion portion 182.

[0091] It should be understood that, in the foregoing embodiment, the telescopic connection member 103 (for example, the spring bar 103) is merely used as an example for description. During actual production or design, the connection member 103 may alternatively be in another form, for example, may be of a fastener type. This is not limited in this application.

[0092] An embodiment of this application provides a wearable device, to improve radiation performance of a side frame antenna by using an external metal member.

[0093] FIG. 3 to FIG. 6 are diagrams of slot (slot) antennas 200 and show simulation results according to embodiments of this application. FIG. 3 is a diagram of a slot antenna 200 according to an embodiment of this application. FIG. 4 is a diagram of another slot antenna 200 according to an embodiment of this application. FIG. 5 is a diagram of S parameters of the slot antennas 200 shown in FIG. 3 and FIG. 4. FIG. 6 shows simulation results of total efficiency of the slot antennas 200 shown in FIG. 3 and FIG. 4.

[0094] As shown in FIG. 3, the slot antenna 200 may include a metal layer 210 and a feed unit 220. A slit 211 is provided on the metal layer 210, and the feed unit 220 is electrically connected between metals on two sides of a central area of the slit 211, to form the slot antenna 200. It should be understood that the central area may be understood as a local area within a specific range from a geometric center (physical lengths of the slit 211 on two sides of the center are the same) or an electrical length center (electrical lengths of the slit 211 on two sides of the center are the same) of the slit 211, for example, an area whose distance from the center is within 5 mm.

[0095] A length L1 of the metal layer 210 is 110 mm, and a width D1 of the metal layer 210 is 22 mm. A length L2 of the slit 211 is 90 mm, and a width D2 of the slit 211 is 2 mm.

[0096] As shown in FIG. 4, in the slot antenna 200, widths of a metal layer 210 on two sides (in an extension direction of a width D1) of a slit 211 each are increased by 10 mm, the width D1 of the metal layer is increased from 22 mm to 42 mm, and other dimensions remain unchanged.

[0097] As shown in FIG. 5, the slot antennas 200 shown in FIG. 3 and FIG. 4 may generate resonance near 1.12 GHz and 3.3 GHz. The resonance generated near 1.12 GHz is generated by the slot antennas in a half wavelength mode, and the resonance generated near 3.3 GHz may be generated by the slot antennas in a three-half wavelength mode.

[0098] In comparison with the slot antenna 200 shown in FIG. 3, the width D1 of the metal layer of the slot antenna 200 shown in FIG. 4 is increased, and by using S11<-5 dB as a boundary, this increases a radiation aperture of the slot antenna, so that a bandwidth of resonance generated by the slot antenna is increased.

[0099] As shown in FIG. 6, because the radiation aperture of the slot antenna 200 shown in FIG. 4 is increased, efficiency of the slot antenna in a resonance frequency band is improved. In comparison with the slot antenna 200 shown in FIG. 3, in the slot antenna 200 shown in FIG. 4, total efficiency is improved by about 3.5 dB near 1.12 GHz, and total efficiency is improved by about 2 dB near 3.3 GHz.

[0100] FIG. 7 and FIG. 8 are diagrams of increasing widths of the metal layer in parts of the slot antenna 200 shown in FIG. 3.

[0101] As shown in FIG. 7, a difference from the slot antenna 200 shown in FIG. 3 lies only in that a metal member 221 and a metal member 222 are added on two sides of a first end of the slit 211, and a width D1 that is of the metal layer 210 and that is at the first end of the slit 211 is extended. The metal member 221 and the metal member 222 at least partially overlap the slit 211 in a y direction.

[0102] As shown in FIG. 8, a difference from the slot antenna 200 shown in FIG. 7 lies only in that a metal member 221 and a metal member 222 are disposed on the two sides of the central area of the slit 211, and a width D1 that is of the metal layer 210 and that in the central area of the slit 211 is extended.

[0103] FIG. 9 and FIG. 10 show simulation results of slot antennas 200 shown in FIG. 7 and FIG. 8. FIG. 9 is a diagram of S parameters of the slot antennas 200 shown in FIG. 7 and FIG. 8. FIG. 10 shows simulation results of total efficiency of the slot antennas 200 shown in FIG. 7 and FIG. 8.

[0104] It should be understood that, FIG. 9 and FIG. 10 show simulation results that are of slot antennas 200 corresponding to lengths L3 of metal members 221 and metal members 222 being respectively 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm and that are present when widths D3 of the metal members 221 and the metal members 222 are 10 mm.

[0105] As shown in FIG. 9, as the length L3 of the metal member increases, a resonance frequency of the slot antenna shifts toward a lower frequency. When lengths L3 of the metal members are the same and the metal members shown in FIG. 8 are disposed on the two sides of the central area of the slit, in comparison with a case in which the metal members shown in FIG. 7 are disposed on the two sides of the first end of the slit, an amplitude of shifting toward a lower frequency by a resonance frequency is more obvious.

[0106] As shown in FIG. 10, in comparison with the slot antenna shown in FIG. 3, in a structure of the slot antenna shown in FIG. 4, extending the widths of the metal layer on the two sides of the slit improves the total efficiency to the greatest extent. In a solution of extending a width of a part of a metal layer, when dimensions of the metal members are the same and the metal members that are shown in FIG. 8 and that are used to extend widths of the metal layer are disposed on the two sides of the central area of the slit, in comparison with a case in which the metal members shown in FIG. 7 are disposed on the two sides of the first end of the slit, an improving amplitude of the total efficiency is more obvious. In addition, in structures shown in FIG. 7 and FIG. 8, as the length L3 of the metal member increases, total radiation efficiency of the slot antenna gradually increases.

[0107] FIG. 11 and FIG. 12 show simulation results of slot antennas 200. FIG. 11 is a diagram of current distribution of the slot antenna 200. FIG. 12 is a diagram of electric field distribution of the slot antenna 200.

[0108] (a) in FIG. 11 is a diagram of distribution of a current generated by the slot antenna 200 shown in FIG. 3 in a half wavelength mode. (b) in FIG. 11 is a diagram of distribution of a current generated by the slot antenna 200 shown in FIG. 4 in a half wavelength mode. (c) in FIG. 11 is a diagram of distribution of a current generated by the slot antenna 200 shown in FIG. 7 in a half wavelength mode. (d) in FIG. 11 is a diagram of distribution of a current generated by the slot antenna 200 shown in FIG. 8 in a half wavelength mode.

[0109] As shown in FIG. 11, the slot antenna has two current strong points in a half wavelength mode, which are respectively located at the first end and a second end of the slit, and has one current node, which is located in the central area of the slit.

[0110] (a) in FIG. 12 is a diagram of distribution of an electric field generated by the slot antenna 200 shown in FIG. 3 in a half wavelength mode. (b) in FIG. 12 is a diagram of distribution of an electric field generated by the slot antenna 200 shown in FIG. 4 in a half wavelength mode. (c) in FIG. 12 is a diagram of distribution of an electric field generated by the slot antenna 200 shown in FIG. 7 in a half wavelength mode. (d) in FIG. 12 is a diagram of distribution of an electric field generated by the slot antenna 200 shown in FIG. 8 in a half wavelength mode.

[0111] As shown in FIG. 12, the slot antenna has one electric field strong point in a half wavelength mode, which is located in the central area of the slit.

[0112] According to the technical solutions provided in this embodiment of this application, in a solution of extending a width of a part of a metal layer, when metal members are disposed on two sides of the electric field strong point of the slot antenna, electric field strength on the metal members is greater; and when metal members are disposed on two sides of the current strong point of the slot antenna, current strength on the metal members is greater. Therefore, with reference to the simulation result of the total efficiency of the slot antenna shown in FIG. 10, a solution in which the metal members are disposed on the two sides of the electric field strong point of the slot antenna (a width that is of the metal layer and that is on the two sides of the electric field strong point of the slot antenna is extended) is better, and has better effect on radiation performance improvement of the slot antenna.

[0113] FIG. 13 is a diagram of a wearable device 300 according to an embodiment of this application.

[0114] As shown in FIG. 13, the wearable device 300 may include a conductive side frame 310, a first antenna 391, and a first metal member 321.

[0115] The first antenna 391 includes a first radiator 3911 and a first feed circuit 341, and the first radiator 3911 includes at least a part of the side frame 310.

[0116] A first feed point 313 is disposed on the side frame 310. The first feed circuit 341 is coupled to the first feed point 313, to feed an electrical signal into the first antenna 391. The side frame 310 includes a first protrusion portion 314, and the first metal member 321 is coupled to the first protrusion portion 314. In an embodiment, the first protrusion portion 341 may be the lug in the foregoing embodiments. In an embodiment, the first protrusion portion 314 and the first metal member 321 may be integrally formed. It should be understood that, the first protrusion portion 314 and the first metal member 321 that are coupled to each other may be considered to include the first protrusion portion 314 and the first metal member 321 that are integrally formed.

[0117] It should be understood that, that the side frame 310 includes the first protrusion portion 314 may mean that the first protrusion portion 314 and the remaining part of the side frame 310 are integrally formed, or may mean that the first protrusion portion 314 is connected to the side frame and is used as the side frame 310 as a whole. In an embodiment, a direction in which the first protrusion portion 314 protrudes on the side frame 310 is different from an extension direction of the side frame 310.

[0118] In an embodiment, a dimension of the first protrusion portion 314 in the extension direction of the side frame is greater than a dimension of the first protrusion portion 314 in the protrusion direction.

[0119] An operating frequency band of the first antenna 391 includes a first frequency band. In an embodiment, a dimension of the first metal member 321 is less than a quarter of a first wavelength, and the first wavelength is a wavelength corresponding to the first frequency band. In an embodiment, that the dimension of the first metal member 321 is less than a quarter of the first wavelength may be understood as that a maximum dimension of the first metal member 321 in each direction is less than a quarter of the first wavelength. The first wavelength may be understood as a vacuum wavelength corresponding to a center frequency of the first frequency band, or may be understood as a vacuum wavelength corresponding to a resonance point in the first frequency band. It should be understood that there is a correspondence between a medium wavelength and a vacuum wavelength, and the foregoing vacuum wavelength may also be converted into a medium wavelength. Details are not described in this embodiment of this application.

[0120] In an embodiment, a dimension of the first metal member 321 is less than one eighth of a first wavelength.

[0121] In an embodiment, a dimension of the first metal member 321 in a specific direction may be greater than a quarter of a first wavelength or greater than one eighth of a first wavelength. That is, the dimension of the first metal member 321 in the specific direction may not be constrained by the foregoing constraints on the dimension of the first metal member 321. In the specific direction, the first metal member 321 is coupled to the first protrusion portion 341.

[0122] In an embodiment, a dimension of the first metal member 321 in a direction away from the first protrusion portion 341 is less than a quarter of a first wavelength. In an embodiment, a dimension of the first metal member 321 in a direction away from the first protrusion portion 341 is less than one eighth of a first wavelength.

[0123] It should be understood that, the metal member in this embodiment of this application may be understood as a component made of a conductive material, and may be a component made of a metal or a component made of a conductive non-metal, for example, graphene. This is not limited in this embodiment of this application.

[0124] It should be understood that, according to the technical solutions provided in this embodiment of this application, the side frame 310 is electrically connected to a ground plane 330 at a first ground point 311 and a second ground point 312, and a slit is formed between the side frame 310 and the ground plane 330. In an embodiment, a mode of the first antenna may be considered as a slot mode (corresponding to a slot antenna), and the slit is used as a radiation slit of the slot antenna.

[0125] It should be understood that a mode of an antenna is not unique and pure. Due to a limitation of a mechanical part and space of a product, a theoretical slot antenna is not completely the same as an antenna that satisfies a mode of a slot antenna (or referred to as a slot mode) in the product. In other words, an antenna structure in the product is not necessarily completely the same as a theoretical slot mode structure, but a similar mode may usually be used as a basis for antenna analysis and understanding of an antenna solution. For example, an antenna structure in this application may be analyzed by using a slot mode, a loop mode (corresponding to a mode of a loop antenna), or another mode (for example, a mode of a linear antenna) in different designs of feeding positions and ground positions. Therefore, mode analysis is merely for better understanding of the solutions but not for limiting the solutions.

[0126] The first metal member 321 is coupled to an outer side (a side away from the ground plane) of the slit formed between the side frame 310 and the ground plane 330, and a width of a metal outside the slit may be partially extended at the first protrusion portion 314, so that a radiation aperture of the first antenna may be extended, to improve radiation performance (for example, a bandwidth and efficiency) of the first antenna.

[0127] It should be understood that, in this embodiment of this application, the first metal member 321 may be configured to adjust radiation performance of the first antenna 391, so that radiation performance of the first antenna 391 in a resonance frequency band or the operating frequency band is improved. In an embodiment, the first metal member 321 may be further configured to adjust a resonance frequency of the first antenna 391, but is not configured to generate additional resonance. In an embodiment, an amplitude of adjusting the resonance frequency of the first antenna 391 by the first metal member 321 is less than 100 MHz. In other words, in two cases in which there is the first metal member 321 and there is no first metal member 321, a difference between resonance frequencies of first antennas 391 is within 100 MHz. In an embodiment, an amplitude of adjusting the resonance frequency of the first antenna 391 by the first metal member 321 is less than 50 MHz. For example, in two cases in which there is the first metal member 321 and there is no first metal member 321, a difference between resonance frequencies of first antennas 391 is within 40 MHz or within 20 MHz.

[0128] In an embodiment, the side frame 310 includes a first side frame portion, and the first protrusion portion 314 protrudes from an outer surface of the first side frame portion. In an embodiment, the first radiator 391 includes the first side frame portion. It should be understood that the first side frame portion may be understood as a side frame portion in a connection area between the first protrusion portion 341 and a ring-shaped side frame.

[0129] In an embodiment, the first ground point 311 is disposed on the side frame 310, as shown in (a) in FIG. 14. The side frame 310 is electrically connected to the ground plane 330 at the first ground point 311, to implement grounding of the side frame 310.

[0130] In an embodiment, the first ground point 311 and the first feed point 313 divide the side frame into two parts with different lengths. The first antenna 391 may perform feeding in a manner of bias feeding (the feed point is offset from a geometric center of the radiator), to excite N times (N is a positive integer) half wavelength modes of the first antenna, for example, a half wavelength mode, a one wavelength mode, and a three-half wavelength mode. It should be understood that the two parts with different lengths may be understood as that a difference between the lengths of the two parts is greater than a first threshold. For example, the threshold may be 5 mm.

[0131] In an embodiment, the second ground point 312 different from the first ground point 311 may be further disposed on the side frame 310, as shown in (b) in FIG. 14. The side frame 310 is electrically connected to the ground plane 330 at the second ground point 312, to implement grounding of the side frame 310.

[0132] In an embodiment, the wearable device 300 may further include a first connection member 351. In an embodiment, two ends of the first connection member 351 may be rotatably connected to the first protrusion portion 314, and the first connection member 351 is electrically connected to the side frame 310 at the first protrusion portion 314.

[0133] In an embodiment, the first metal member 321 may be coupled to the first protrusion portion 314 through the first connection member 351. In an embodiment, the first connection member 351 may be the spring bar in the foregoing embodiment.

[0134] In an embodiment, the first metal member 321 may be electrically connected to the first connection member 351. Alternatively, in an embodiment, the first metal member 321 and the first connection member 351 may be spaced apart, and connected to each other in an indirect coupling manner. In an embodiment, when the first metal member 321 and the first connection member 351 are spaced apart, a distance between the first metal member 321 and the first connection member 351 may be less than 1 mm, so that the first protrusion portion 314 may be well coupled with the side frame 310 at the first protrusion portion 314 through the first connection member 351.

[0135] It should be understood that, for brevity of description, in this embodiment of this application, an example in which the first metal member 321 is electrically connected to the first protrusion portion 314 of the side frame 310 through the first protrusion portion 314 is merely used for description. During actual application, the first metal member 321 may alternatively be electrically connected to the side frame 310 through a fastener or the like. A manner of coupling between the first metal member 321 and the first protrusion portion 314 of the side frame 310 is not limited in this embodiment of this application, and may be adjusted based on actual production or design.

[0136] In an embodiment, the wearable electronic device 300 may further include a second metal member 322, as shown in FIG. 13. The side frame 310 includes a second protrusion portion 315, and the second metal member 322 is coupled to the second protrusion portion 315.

[0137] In an embodiment, the second protrusion portion 315 protrudes from an outer surface of a second side frame portion. In an embodiment, the first radiator 391 includes the second side frame portion. It should be understood that the second side frame portion may be understood as a side frame portion in a connection area between the second protrusion portion 315 and the ring-shaped side frame.

[0138] In an embodiment, the first radiator 3911 includes a third side frame portion between the first ground point 311 and the second ground point 312, and the first feed point 313 is disposed on the third side frame portion. In this embodiment, at least a part of the first protrusion portion 314 and / or at least a part of the second protrusion portion 315 may protrude from an outer surface of the third side frame portion.

[0139] In an embodiment, at least a part of the first protrusion portion 314 may be located on a third side frame portion between the first ground point 311 and the first feed point 313. In an embodiment, the first protrusion portion 314 is closer to the first ground point 311 than the first feed point 313. In an embodiment, the first protrusion portion 314 is closer to the first feed point 313 than the first ground point 311. In an embodiment, at least a part of the second protrusion portion 315 may be located on a third side frame portion between the second ground point 312 and the first feed point 313. In an embodiment, the second protrusion portion 315 is closer to the second ground point 312 than the first feed point 313. In an embodiment, the second protrusion portion 315 is closer to the first feed point 313 than the second ground point 312.

[0140] It should be understood that the foregoing two different manners of disposing the protrusion portion 314 / 315 (close to the first ground point 311 or close to the first feed point 313) may be set based on an internal space status of the wearable device, for example, a stacking status of internal components. This is not specifically limited in this application. In an embodiment, the protrusion portion 314 / 315 is disposed in an electric field strong area of the first antenna 391. Because at least one of the protrusion portion 314 / 315 is coupled to a metal member, the metal member can improve radiation performance of the first antenna 391.

[0141] In an embodiment, the first protrusion portion 314 and the second protrusion portion 315 may be respectively disposed relative to two different antennas. For example, at least a part of the first protrusion portion 314 is located at a side frame used as a radiator of a first antenna, and at least a part of the second protrusion portion 315 is located at a side frame used as a radiator of a second antenna, where the first antenna and the second antenna are fed by different feed sources. It should be understood that the radiator of the first antenna and the radiator of the second antenna may have a common part, or may be two parts separated (for example, separated through grounding or by a fracture).

[0142] In an embodiment, the wearable device 300 may further include a second connection member 352. Two ends of the second connection member 352 may be rotatably connected to the second protrusion portion 315, and the second connection member 352 is electrically connected to the side frame 310 at the second protrusion portion 315. In an embodiment, the second connection member 352 may be the spring bar in the foregoing embodiment.

[0143] In an embodiment, the second metal member 322 may be coupled to the second protrusion portion 315 through the second connection member 352, and a manner of connecting the second metal member 322 to the second connection member 352 may be the same as a manner of connecting the first metal member 321 to the first connection member 351.

[0144] It should be understood that, the second metal member 322 is coupled to the outer side (the side away from the ground plane) of the slit formed between the side frame 310 and the ground plane 330, and a width of a metal outside the slit may be partially extended at the second protrusion portion 315, so that the radiation aperture of the first antenna is further extended, to improve radiation performance (for example, a bandwidth and efficiency) of the first antenna.

[0145] It should be understood that, in this embodiment of this application, the second metal member 322 may be configured to adjust radiation performance of the first antenna 391, so that radiation performance of the first antenna 391 in the resonance frequency band or the operating frequency band is improved. In an embodiment, the second metal member 322 may be further configured to adjust the resonance frequency of the first antenna 391, but is not configured to generate additional resonance. In an embodiment, an amplitude of adjusting the resonance frequency of the first antenna 391 by the second metal member 322 is less than 100 MHz. In other words, in two cases in which there is the second metal member 322 and there is no second metal member 322, a difference between resonance frequencies of first antennas 391 is within 100 MHz. In an embodiment, an amplitude of adjusting the resonance frequency of the first antenna 391 by the second metal member 322 is less than 50 MHz. For example, in two cases in which there is the second metal member 322 and there is no second metal member 322, a difference between resonance frequencies of first antennas 391 is within 40 MHz or within 20 MHz.

[0146] In an embodiment, the first metal member 321 and the second metal member 322 may be respectively configured to improve radiation performance of two different antennas in resonance frequency bands or operating frequency bands of the two antennas. For example, at least a part of the first metal member 321 is coupled to a side frame used as a radiator of a first antenna, and at least a part of the second metal member 322 is coupled to a side frame used as a radiator of a second antenna, where the first antenna and the second antenna are fed by different feed sources. It should be understood that the radiator of the first antenna and the radiator of the second antenna may have a common part, or may be two parts separated (for example, separated through grounding or by a fracture).

[0147] In an embodiment, the wearable device 300 may further include a first wristband 361, as shown in FIG. 15. A first end of the first wristband 361 may be connected to the first protrusion portion 314. In an embodiment, the first end of the first wristband 361 may be rotatably connected to the first protrusion portion 314, for example, rotatably connected to the first protrusion portion 314 through the first connection member 351. In an embodiment, the first metal member 321 may be located at the first end of the first wristband 361.

[0148] In an embodiment, the wearable device 300 may further include a second wristband 362, as shown in FIG. 15. A first end of the second wristband 362 may be connected to the second protrusion portion 315. In an embodiment, the first end of the second wristband 362 may be rotatably connected to the second protrusion portion 315, for example, rotatably connected to the second protrusion portion 315 through the second connection member 352. In an embodiment, the second metal member 322 may be located at the first end of the second wristband 362.

[0149] In an embodiment, the first wristband 361 and / or the second wristband 362 may include non-metal (insulation) portions / a non-metal (insulation) portion, for example, made of a non-metal material, for example, leather, rubber, or silicone. In an embodiment, the first metal member 321 may be wrapped in the non-metal portion of the first wristband 361, and / or the second metal member 322 may be wrapped in the non-metal portion of the second wristband 362. In an embodiment, a first end of the non-metal portion of the wristband may be connected to a corresponding protrusion portion. In an embodiment, the first metal member 321 may be connected between the non-metal portion of the first wristband 361 and the first protrusion portion 314, and / or the second metal member 322 may be connected between the non-metal portion of the second wristband 362 and the second protrusion portion 315. For example, one end of the metal member 321 / 322 is connected to the protrusion portion 314 / 315, and the other end of the metal member 321 / 322 is connected to the non-metal portion of the wristband 361 / 362.

[0150] It should be understood that the first metal member 321 may be disposed inside the first wristband 361, and / or the second metal member 322 may be disposed inside the second wristband 362. The metal member disposed inside cannot be seen on an appearance surface of the wristband, so that appearance uniformity of the wristband can be increased, and the wristband is more beautiful.

[0151] In an embodiment, corresponding metal members are disposed inside both the first wristband 361 and the second wristband 362, or metal members are connected both between the first wristband 361 and a corresponding protrusion portion and between the second wristband 362 and a corresponding protrusion portion. In this way, a user easily disassembles and mounts the wristband without affecting antenna performance of the wearable device.

[0152] It should be understood that in this embodiment of this application, an example in which both the first wristband 361 and the second wristband 362 wrap metal members or both are connected to metal members is merely used for description. During actual production or design, a metal member may be disposed in only one wristband. This is not limited in this embodiment of this application. In an embodiment, as shown in FIG. 16, the first wristband 361 and the second wristband 362 are metal wristbands, the first end of the first wristband 361 may be coupled to the first protrusion portion 314, and the first end of the second wristband 362 may be coupled to the second protrusion portion 316. In an embodiment, the first wristband 361 and the second wristband 362 may be used as an entire wristband, and a total length of the first wristband 361 and the second wristband 362 is adjusted by using a snap-fit structure. Alternatively, the first wristband 361 and the second wristband 362 may respectively be two separate distributions, and are connected as a whole through a connection structure.

[0153] In an embodiment, the first wristband 361 may include a plurality of links. The plurality of links include a first link 3611 and a second link 3612 that are sequentially connected, and the first link 3611 may be connected to, for example, rotatably connected to, the first protrusion portion 314. The first link 3611 is made of a metal material, the second link 3612 is made of an insulation material (for example, a non-metal material, for example, ceramic), and the first metal member 321 may be the first link 3611. In an embodiment, the first link 3611 may be connected to, for example, rotatably connected to, the first protrusion portion 314 through the first connection member.

[0154] In an embodiment, the plurality of links include a third link 3613 and a fourth link 3614 that are sequentially connected, and the third link 3613 may be connected to, for example, rotatably connected to, the second protrusion portion 315. The third link 3613 is made of a metal material, the fourth link 3614 is made of an insulation material (for example, a non-metal material, for example, ceramic), and the second metal member 322 may be the third link 3613. In an embodiment, the third link 3613 may be connected to, for example, rotatably connected to, the second protrusion portion 315 through the second connection member.

[0155] In an embodiment, all of the plurality of links of the first wristband 361 except the second link 3612 and the fourth link 3614 may be made of a metal material.

[0156] It should be understood that, when the first wristband of the wearable device 300 is of a metal architecture, because an end of the first wristband and an end of the second wristband are respectively connected to the first protrusion portion and the second protrusion portion, and are disposed close to the side frame, when the slit is formed between the side frame and the ground plane, a large amount of energy is coupled. A part of energy radiated by the first antenna is introduced to the first wristband. As a result, radiation performance of the antenna is reduced (for example, a gain is reduced, or efficiency is reduced). According to the technical solutions provided in this embodiment of this application, the first link that is in the first wristband and that is connected to the first protrusion portion is set to be made of a metal material, and the second link that is connected to the first link is set to be made of a non-metal material, so that a part of energy radiated by the first antenna can be coupled only to the first link, to avoid a performance loss of the first antenna. In addition, according to the foregoing technical solutions, the metal member is coupled on the side of the slit of the first antenna, so that radiation performance of the first antenna can be further improved. The third link 3613 and the fourth link 3614 that are connected to the second protrusion portion may also be correspondingly understood.

[0157] In an embodiment, the first wristband 361 may include a plurality of first links 3611 or a plurality of third links 3613, to be used in wearable devices 300 in different operating frequency bands. Alternatively, in an embodiment, the first wristband 361 may include a plurality of second links 3612 or a plurality of fourth links 3614, so that the first link 3611 or the third link 3613 is well isolated from another metal link, to avoid interference from the another metal link.

[0158] In an embodiment, colors of the first link 3611 and the second link 3612 may be the same, and colors of the third link 3613 and the fourth link 3614 may be the same. Because the first link 3611 and the second link 3612 are made of different materials, and the third link 3613 and the fourth link 3614 are made of different materials, the colors of the first link 3611 and the second link 3612 and the colors of the third link 3613 and the fourth link 3614 may be changed, to make appearance surfaces of the first link 3611 and the second link 3612 unified. This improves aesthetics.

[0159] It should be understood that in this embodiment of this application, an example in which the metal links are disposed at two ends of the first wristband of a metal architecture is merely used for description. During actual production or design, a metal link may be disposed only at one end of the first wristband, and only a non-metal link is disposed at the other end. This is not limited in this embodiment of this application. In addition, in the following embodiments, for brevity of description, an example in which the wearable device includes the first wristband 361 made of a non-metal material and the second wristband 362 is merely used for description. However, the following embodiments are also applicable to the first wristband of a metal architecture.

[0160] In an embodiment, when the first wristband 361 includes a non-metal portion, a width L2 that is of the first wristband 361 and that is at the first end (for example, an end connected to the protrusion portion) may be less than or equal to 28 mm and greater than or equal to 8 mm, as shown in FIG. 13. A dimension L1 of the first metal member 321 in a first direction may be approximately the same as the width L2 of the first wristband 361. For example, L1 and L2 may satisfy that L2>L1≥L2×80%. The first direction may be an extension direction (for example, an x direction) of the width of the first wristband 361.

[0161] In an embodiment, a dimension L1 of the first metal member 321 in a first direction may be less than or equal to 22 mm, for example, may be less than or equal to 20 mm. The first direction is an extension direction of a coupling position between the first metal member 321 and the first protrusion portion. For example, the first direction is an x direction. In an embodiment, when the second wristband 362 includes a non-metal portion, a width L4 that is of the second wristband 362 and that is at the first end (for example, an end connected to the protrusion portion) may be less than or equal to 28 mm and greater than or equal to 8 mm. A dimension L3 of the second metal member 322 in a first direction may be approximately the same as the width L4 of the second wristband 362. For example, L3 and L4 may satisfy that L4>1.3≥1.4×80%.

[0162] In an embodiment, a dimension L3 of the second metal member 322 in a first direction may be less than or equal to 22 mm, for example, may be less than or equal to 20 mm. The first direction is an extension direction of a coupling position between the second metal member 322 and the corresponding protrusion portion. For example, the first direction is an x direction.

[0163] In an embodiment, the first metal member 321 or the second metal member 322 may both include a plurality of metal strips. A dimension of the metal strip in the first direction is small, for example, less than 2 mm. The plurality of metal strips are closely arranged (for example, a distance between adjacent metal strips is less than 1 mm), and may be equivalent to a complete metal member. The dimension of the metal member in the first direction may be understood as dimensions of the plurality of metal strips in the first direction.

[0164] It should be understood that the dimension of the metal member in the first direction may be understood as a width of the metal member.

[0165] It should be understood that, as the width L1 of the first metal member and / or the width L3 of the second metal member increase / increases, with reference to the simulation result shown in FIG. 10, radiation performance (for example, efficiency) of the antenna may be further improved.

[0166] In an embodiment, a dimension L1 of the first metal member 321 in a first direction may be greater than or equal to 8 mm, so that radiation performance of the antenna may be improved to some extent.

[0167] In an embodiment, a dimension L1 of the first metal member 321 in a first direction is greater than or equal to 15 mm and less than 25 mm.

[0168] In an embodiment, a dimension L3 of the second metal member 322 in a first direction may be greater than or equal to 8 mm, so that radiation performance of the antenna may be improved to some extent.

[0169] In an embodiment, a dimension L3 of the second metal member 322 in a first direction is greater than or equal to 15 mm and less than 25 mm.

[0170] In an embodiment, when the first wristband is of a metal architecture, the first metal member or the second metal member is a link on the first wristband, a width L1 of the first metal member may be greater than or equal to 8 mm and less than or equal to 25 mm, for example, greater than or equal to 15 mm and less than or equal to 25 mm, and a width L3 of the second metal member may be greater than or equal to 8 mm and less than or equal to 25 mm, for example, greater than or equal to 15 mm and less than or equal to 25 mm.

[0171] It should be understood that, as the width L1 of the first metal member or the width L3 of the second metal member increases, with reference to the simulation result shown in FIG. 10, radiation performance (for example, efficiency) of the slot antenna may be further improved.

[0172] In an embodiment, a dimension D1 of the first metal member 321 in a second direction may be less than or equal to 10 mm. The second direction is perpendicular to the first direction. In an embodiment, the second direction may be a direction in which the first metal member 321 is away from the first protrusion portion.

[0173] In an embodiment, a dimension D2 of the second metal member 322 in a second direction may be less than or equal to 10 mm. In an embodiment, the second direction may be a direction in which the second metal member 322 is away from the corresponding protrusion portion.

[0174] In an embodiment, a dimension D1 of the first metal member 321 in a second direction may be less than or equal to 9 mm and greater than or equal to 6 mm. In an embodiment, a dimension D2 of the second metal member 322 in a second direction may be less than or equal to 9 mm and greater than or equal to 6 mm.

[0175] In an embodiment, a dimension of the first metal member 321 in a second direction is less than a quarter of the first wavelength. In an embodiment, a dimension D2 of the second metal member 322 in a second direction is less than a quarter of the first wavelength.

[0176] In an embodiment, a dimension of the first metal member 321 in a second direction is less than one eighth of the first wavelength. In an embodiment, a dimension D2 of the second metal member 322 in a second direction is less than one eighth of the first wavelength.

[0177] It should be understood that, when the user wears the wearable device on a wrist, because the wrist is a curved surface, and a rear cover of the wearable device is of a planar structure, the wearable device and the wrist of the user cannot completely overlap, and gaps are generated at a joint between the first wristband 361 and a main body 301 of the wearable device and a joint between the second wristband 362 and the main body 301 of the wearable device. For a high-frequency signal, for example, a signal in a receive frequency band (2483.5 MHz to 2500 MHz) in a BeiDou system and 2.4 GHz Wi-Fi and BT frequency bands, a human body has large impact on an electrical signal in the frequency band (strength of absorbing the electrical signal is excessively high), resulting in poor radiation performance of the antenna in the frequency band. Therefore, by using the gap, a dimension D1 of the first metal member 321 in a second direction may be less than or equal to 10 mm, and a dimension D2 of the second metal member 322 in a second direction may be less than or equal to 10 mm, so that the metal member can prevent the wrist of the user from absorbing an electromagnetic wave on the metal member, to improve radiation performance of the antenna.

[0178] It should be understood that the dimension of the metal member in the second direction may be understood as a length of the metal member.

[0179] In an embodiment, a shape of the second metal member 322 may be the same as or different from a shape of the first metal member 321 (both the width and the length of the second metal member are different from the width L1 and the length D1 of the first metal member). This is not limited in this embodiment of this application, and may be adjusted based on actual production or design.

[0180] In an embodiment, a shape of the second metal member 322 is the same as a shape of the first metal member 321. This helps the user to disassemble and mount the wristband without affecting antenna performance of the wearable device.

[0181] In an embodiment, the side frame 310 may be in a ring shape, and an inner diameter of the side frame 310 may be between 35 mm and 50 mm. It should be understood that when the side frame 310 is in a circular ring shape, an inner diameter may be understood as a shortest distance between a virtual center of a circle formed by the side frame and the side frame. When the side frame 310 is in a rectangular (or square) ring shape or another ring shape, an inner diameter may be understood as an average value of distances between a virtual center and an outer edge of the side frame. For example, an inner diameter of a square side frame may be 1 / 8 of an outer circumference.

[0182] In an embodiment, no fracture may be provided on the side frame 310. In an embodiment, the side frame is a continuous mechanical part. In other words, the side frame 310 is continuous on an appearance surface of the side frame 310. The fracture may be understood as an insulation slit formed by completely breaking the side frame at a first position and filling the side frame with plastic. In the wearable device provided in this embodiment of this application, no fracture is provided on the side frame, so that integrity of a metal appearance is maintained, and aesthetics of the wearable device is improved. In this case, an entire circle of the side frame is used as a radiator of one or more antennas, or a part of the side frame is used as a radiator of one or more antennas, and the remaining part is grounded.

[0183] It should be understood that, because providing a fracture on a radiator may change a radiation mode, and may improve radiation performance, in this embodiment of this application, a fracture may also be provided on a side frame portion. For example, an insulation fracture may be provided in an area in which a key is disposed on the side frame, and plastic may be filled in the area.

[0184] FIG. 18 and FIG. 19 show simulation results of the first antenna shown in FIG. 13. FIG. 18 shows simulation results of an S parameter and total efficiency of the first antenna shown in FIG. 13. FIG. 19 shows a simulation result of total efficiency improved by the first antenna shown in FIG. 13 at each frequency.

[0185] It should be understood that, for brevity of description, in this embodiment, an example in which the first metal member and the second metal member have same dimensions, with a width of 20 mm and a length of 8 mm is used for description.

[0186] As shown in FIG. 18, by using S11<-5 dB as a boundary, a bandwidth of a resonance frequency band of a first antenna on which a metal member is disposed is greater than a bandwidth of a resonance frequency band of a first antenna on which no metal is disposed.

[0187] In addition, in the resonance frequency band, the total efficiency of the first antenna is improved by 1 dB to 3 dB. For example, at 1.57 GHz, the total efficiency is improved by 1.35 dB; at 1.71 GHz, the total efficiency is improved by 1.92 dB; at 2 GHz, the total efficiency is improved by 1.14 dB; at 2.5 GHz, the total efficiency is improved by 1.37 dB; and at 2.69 GHz, the total efficiency is improved by 3.07 dB.

[0188] A difference between total efficiency of the first antenna on which the metal member is disposed and total efficiency of the first antenna on which no metal is disposed at each frequency is shown in FIG. 19. When the operating frequency band of the antenna is greater than 700 MHz and less than 2800 MHz, the metal member can improve the total efficiency of the antenna.

[0189] It should be understood that, the metal member with the width of 20 mm and the length of 8 mm is merely used as an example for describing the foregoing simulation result. When the operating frequency band of the antenna is another frequency band, a dimension of the metal member may be adjusted, to improve a radiation characteristic of the first antenna.

[0190] FIG. 20 is a diagram of a wearable device 300 according to an embodiment of this application.

[0191] As shown in FIG. 20, a side frame 310 of the wearable device 300 is divided into a third side frame portion 371 and a fourth side frame portion 372 by a first ground point 311 and a second ground point 312.

[0192] It should be understood that the wearable device 300 shown in FIG. 13 forms the first antenna between the third side frame portion 371 and the ground plane 330 (the first feed point 313 is located on the third side frame portion 371, and the first feed circuit 341 is coupled to the first feed point 313). A difference from the wearable device 300 shown in FIG. 14b lies in that the wearable device 300 shown in FIG. 20 forms a second antenna between the fourth side frame portion 312 and a ground plane 330 based on the wearable device 300 shown in FIG. 14b (a second feed point 316 is located on the fourth side frame portion 372, and a second feed circuit 342 is coupled to the second feed point 316).

[0193] The wearable device 300 shown in FIG. 20 may include a first antenna that uses the third side frame portion 371 as a primary radiator, and the second antenna that uses the fourth side frame portion 312 as a primary radiator. In an embodiment, no fracture is provided on the third side frame portion 371. A slit is formed between the third side frame portion 371 and the ground plane 330, to be used as a radiation slot slit of a first slot antenna. In an embodiment, no fracture is provided on the fourth side frame portion 312. A slit is formed between the fourth side frame portion 312 and the ground plane 330, to be used as a radiation slot slit of a second slot antenna.

[0194] In an embodiment, an operating mode of the first antenna and an operating mode of the second antenna may include N times (N is a positive integer) half wavelength modes, for example, a half wavelength mode, a one wavelength mode, and a three-half wavelength mode. In an embodiment, a length of the third side frame portion 371 may be greater than a length of the fourth side frame portion 372, so that a resonance frequency band of resonance generated by a first antenna element is different from a resonance frequency band of resonance generated by a second antenna element, and the wearable device may include more communication frequency bands.

[0195] In an embodiment, an operating frequency band of the first antenna may include a sub-3 GHz frequency band in a cellular network, for example, B1 (1920 MHz-1980 MHz), B3 (1710 MHz-1785 MHz), B5 (824 MHz-849 MHz), B8 (890 MHz-915 MHz), and B28 (704 MHz-747 MHz).

[0196] In an embodiment, an operating frequency band of the second antenna may include an L1 frequency band and an L5 frequency band in a GPS, and 2.4 GHz Wi-Fi and BT frequency bands.

[0197] It should be understood that the foregoing frequency bands are not limited in this embodiment of this application. During actual production or design, the frequency bands may be adjusted to meet different communication requirements.

[0198] In an embodiment, at least a part of a first protrusion portion 314 may be located between the first ground point 311 and a first feed point 313, as shown in FIG. 21. In an embodiment, at least a part of a second protrusion portion 315 may be located between the second ground point 312 and the first feed point 313.

[0199] It should be understood that the at least a part of the first protrusion portion 314 and the at least a part of the second protrusion portion 315 may be located on the third side frame portion, and a first metal member 321 and a second metal member 322 may be configured to improve radiation performance of the first antenna.

[0200] In an embodiment, a main part of the first protrusion portion 314 may be located on the third side frame portion 371. In an embodiment, a main part of the second protrusion portion 315 may be located on the fourth side frame portion 372. It should be understood that, that the main part of the first protrusion portion 314 is located on the third side frame portion means that a protrusion area of the first protrusion portion 314 on the side frame may cross the first ground point 311 or the second ground point 312, where a connection area between the first protrusion portion 314 and the third side frame portion is greater than a connection area between the first protrusion portion 314 and the fourth side frame portion. A similar understanding may be used for "the main part of the second protrusion portion 315 is located on the fourth side frame portion 372".

[0201] It should be understood that the main part of the first protrusion portion 314 is located on the third side frame portion 371, so that the first metal member 321 may be configured to improve radiation performance of the first antenna. The main part of the second protrusion portion 315 is located on the fourth side frame portion 372, so that the second metal member 322 may be configured to improve radiation performance of the second antenna. For brevity of description, in this embodiment of this application, an example in which the at least a part of the first protrusion portion 314 and the at least a part of the second protrusion portion 315 may be located on the third side frame portion is merely used for description.

[0202] In this embodiment of this application, as shown in FIG. 13, only one feed point 313 may be disposed on the metal side frame 310, and no ground point is disposed. This is merely an example, and is not intended to limit the solutions of this application. It should be understood that, in an embodiment, only one feed point 313 and one ground point 311 may be disposed on the metal side frame 310, as shown in (a) in FIG. 14. In an embodiment, only one feed point 313 and two ground points 311 and 312 may be disposed on the metal side frame 310, as shown in (b) in FIG. 14. In an embodiment, only one feed point 313 and more than two ground points may be disposed on the metal side frame 310.

[0203] In this embodiment of this application, as shown in FIG. 20, only two feed points 313 and 316 and two ground points 311 and 312 may be disposed on the metal side frame 310. This is merely an example, and is not intended to limit the solutions of this application. It should be understood that, in an embodiment, more than two feed points may be disposed on the metal side frame 310. In this case, the metal side frame 310 is used as a radiator of more antennas. In an embodiment, only two feed points 313 and 316 and more than two ground points may be disposed on the metal side frame 310.

[0204] The ground point in this embodiment of this application may include a structure in which the side frame is directly grounded by using a connecting rib structure of a middle frame, or may include a component ground structure in which grounding is performed by using an electrical component (for example, a capacitor, a resistor, and / or an inductor). It should be understood that the first antenna 391 fed with a signal through the feed point 313 may operate in a plurality of modes, and correspondingly generate a large amount of resonance, to support a wide operating frequency band. At least a part of the metal side frame 310 is used as a radiator of the first antenna 391. A plurality of ground points may be disposed. A filter (for example, a capacitor and / or an inductor) is disposed at one or more of the ground points, to improve radiation performance and radiation efficiency of the plurality of modes. Similarly, at least a part of the metal side frame 310 is used as a radiator of the second antenna. A plurality of ground points may also be disposed, to improve radiation performance and radiation efficiency of a plurality of modes of the second antenna.

[0205] In an embodiment, the wearable device 300 includes a third metal member 323, as shown in FIG. 22. The first metal member 321 is located between the third metal member 323 and the first protrusion portion 314. The third metal member 323 and the first metal member 321 are spaced apart in a first direction, and the first direction is a length direction (for example, a y direction) of the first metal member 321, or may be understood as a length extension direction of a wristband.

[0206] In an embodiment, the wearable device 300 further includes a filtering structure 380, and the filtering structure 380 is coupled between the first metal member 321 and the third metal member 323. An operating frequency band of the wearable device includes a first frequency band and a second frequency band. The filtering structure 380 is in a connected state in the first frequency band, and is in a disconnected state in the second frequency band. A frequency of the first frequency band is lower than a frequency of the second frequency band.

[0207] In an embodiment, a first radiator and the first metal member are configured to generate first resonance, the first radiator, the first metal member, and the second metal member are configured to generate second resonance, a resonance frequency band of the second resonance includes the first frequency band, and a resonance frequency band of the first resonance includes the second frequency band.

[0208] It should be understood that, that the first metal member is configured to generate the first resonance and the second metal member is configured to generate the second resonance means that the first metal member and the second metal member respectively affect generation of the first resonance and the second resonance. In an embodiment, the first metal member may be configured to adjust a frequency of the first resonance, but is not configured to generate additional resonance. In an embodiment, the second metal member may be configured to adjust a frequency of the second resonance, but is not configured to generate additional resonance.

[0209] In an embodiment, an amplitude of adjusting the frequency of the first resonance / the second resonance is less than 100 MHz. In other words, in two cases in which there is the first metal member and there is no first metal member, a difference between frequencies of the first resonance is within 100 MHz; or in two cases in which there is the second metal member and there is no second metal member, a difference between frequencies of the second resonance is within 100 MHz.

[0210] In an embodiment, an amplitude of adjusting the frequency of the first resonance / the second resonance is less than 50 MHz. For example, in two cases in which there is the first metal member and there is no first metal member, a difference between frequencies of the first resonance is within 40 MHz or within 20 MHz. For example, in two cases in which there is the second metal member and there is no second metal member, a difference between frequencies of the second resonance is within 40 MHz or within 20 MHz.

[0211] In an embodiment, the first frequency band may include at least a part of frequency bands from 700 MHz to 1176 MHz. In an embodiment, the first frequency band may include at least a part of frequency bands from 700 MHz to 960 MHz.

[0212] In an embodiment, the second frequency band may include at least a part of frequency bands from 1575 MHz to 2690 MHz.

[0213] It should be understood that the filtering structure 380 may be a low-pass and high-impedance low-pass filter, so that the first metal member 321 and the third metal member 323 are electrically connected to each other in the low-frequency first frequency band and disconnected in the high-frequency second frequency band. Because the filtering structure 380 is disposed between the first metal member 321 and the third metal member 323, when the first antenna operates in different frequency bands, lengths of loaded metal members may be different, and the metal members may be flexibly applicable to different communication frequency bands, to improve performance of different communication frequency bands. For example, when the first antenna operates in a low frequency band (the first frequency band), a corresponding operating wavelength is long, and a length of a metal on an outer side of a slit formed between the third side frame portion 371 and the ground plane 330 is long. When the first antenna operates in a high frequency band (the second frequency band), a corresponding operating wavelength is short, and a length of a metal on an outer side of a slit formed between the third side frame portion 371 and the ground plane 330 is short.

[0214] In addition, for brevity of description, in this embodiment of this application, the first metal member 321 and the third metal member 323 are merely used as an example for description. During actual application, a fourth metal member and a fifth metal member may be further included. A filtering structure is disposed between two adjacent metal members, so that the wearable device has a corresponding metal member length in any operating frequency band. This further improves communication performance of the wearable device.

[0215] In an embodiment, when a user wears the wearable device 300, to avoid a decrease in radiation performance of the antenna caused by excessive absorption of energy on the metal member by a human body, a dimension D3 of the metal member at the first protrusion portion 314 in a second direction may be less than or equal to 30 mm. Alternatively, in an embodiment, a dimension D3 of the metal member in a second direction may be less than or equal to 25 mm or 20 mm.

[0216] In an embodiment, the filtering structure 380 may include a capacitor member 381 and an inductor member 382, as shown in FIG. 22. A first end of the inductor member 382 is electrically connected to the third metal member 323, and a second end of the inductor member 382 is electrically connected to the capacitor member 381. The capacitor member 381 and the first metal member 321 are spaced apart in a third direction, and the capacitor member 381 and the first metal member 321 at least partially overlap in the third direction. As shown in FIG. 23, the third direction is a direction (for example, a z direction) perpendicular to a plane on which the first metal member 321 is located.

[0217] In an embodiment, the capacitor member 381 and the inductor member 382 may be of an integrally formed transmission line structure, and the inductor member 382 may be in a fold line shape.

[0218] It should be understood that the inductor member 382 may be equivalent to an inductor, and an inductance of the equivalent inductor may be determined by using a cabling length and a cabling width of the inductor member 382. The capacitor member 382 and the first metal member 321 may be equivalent to a capacitor, and a capacitance value of the equivalent capacitor may be determined by using a distance between the capacitor member 382 and the first metal member 321 and an overlapping part between the capacitor member 382 and the first metal member 321 in the second direction. An LC filtering structure may be formed by using the capacitor member 381 and the inductor member 382, so that the filtering structure 380 is in a conducted state in the first frequency band, and is in a disconnected state in the second frequency band. The frequency of the first frequency band is lower than the frequency of the second frequency band. In the foregoing embodiment, only a specific structure of a possible filtering structure 380 is shown. During actual application, a structure of another filtering structure may alternatively be used. This is not limited in this embodiment of this application.

[0219] It should be understood that, in the foregoing embodiment, the filtering structure 380 may include a distributed component, or may include a lumped component, or may include a combination of a distributed component and a lumped component. This is not limited in this embodiment of this application, and may be adjusted based on actual production or design.

[0220] It should be understood that, in the foregoing embodiment, the first protrusion portion 314 is merely used as an example for description. Actually, application may alternatively be performed on the second protrusion portion, and the second protrusion portion may be used to further improve radiation performance of the first antenna, or may be used to improve radiation performance of the second antenna. This is not limited in this embodiment of this application.

[0221] In an embodiment, the first antenna or the second antenna may further include a matching circuit, so that the first antenna or the second antenna may be electrically connected to different electronic components in different resonance frequency bands, to implement impedance matching of the antenna in each frequency band and improve radiation performance of the antenna.

[0222] In an embodiment, the first antenna or the second antenna may further include a filter circuit. A clutter signal generated by the antenna may be introduced into the ground plane through the filter circuit, to improve radiation performance of the antenna.

[0223] FIG. 24 and FIG. 25 show simulation results of antennas in the wearable device shown in FIG. 20. FIG. 24 shows a simulation result of total efficiency of the first antenna in the wearable device shown in FIG. 20. FIG. 25 shows a simulation result of total efficiency of the second antenna in the wearable device shown in FIG. 20.

[0224] It should be understood that, for brevity of description, in this embodiment, an example in which at least a part of the first protrusion portion and at least a part of the second protrusion portion may be located on the third side frame portion is used for description.

[0225] As shown in FIG. 24, in the resonance frequency band, the total efficiency of the antenna is improved by 1 dB to 2.5 dB. For example, near 1 GHz, the total efficiency is improved by 2.25 dB; at 1.71 GHz, the total efficiency is improved by 2.05 dB; and at 2.5 GHz, the total efficiency is improved by 1.44 dB.

[0226] As shown in FIG. 25, although the at least a part of the first protrusion portion and the at least a part of the second protrusion portion may be located on the third side frame portion, radiation performance of the second antenna formed between the fourth side frame portion and the ground plane is also improved to some extent.

[0227] In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described apparatus embodiments are merely examples. For example, division of the units is merely logical function division and may be other division during actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces. The indirect couplings or communication connections between apparatuses or units may be implemented in electronic or other forms.

[0228] The foregoing descriptions are merely specific implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A wearable device, comprising: a conductive side frame, wherein a first feed point is disposed on the side frame, and the side frame comprises a first protrusion portion; a first antenna, comprising a first radiator and a first feed circuit, wherein the first radiator comprises at least a part of the side frame, the first feed circuit is coupled to the first feed point, and an operating frequency band of the first antenna comprises a first frequency band; and a first metal member, wherein the first metal member is coupled to the first protrusion portion, a dimension of the first metal member is less than a quarter of a first wavelength, and the first wavelength is a wavelength corresponding to the first frequency band.

2. The wearable device according to claim 1, wherein the side frame comprises a first side frame portion, and the first protrusion portion protrudes from an outer surface of the first side frame portion; and the first radiator comprises the first side frame portion.

3. The wearable device according to claim 1 or 2, wherein the wearable device further comprises a first wristband, and the first wristband comprises a non-metal portion; and a first end of the non-metal portion of the first wristband is connected to the first protrusion portion, and the first metal member is wrapped in the non-metal portion of the first wristband; or one end of the first metal member is connected to the first protrusion portion, and the other end of the first metal member is connected to the non-metal portion of the first wristband.

4. The wearable device according to claim 3, wherein the wearable device further comprises a first connection member, two ends of the first connection member are connected to the first protrusion portion, and the first wristband is rotatably connected to the first protrusion portion through the first connection member; and the first metal member is coupled to the first connection member.

5. The wearable device according to any one of claims 1 to 4, wherein a dimension L1 of the first metal member in a first direction is greater than or equal to 8 mm, and / or a dimension D1 of the first metal member in a second direction is less than or equal to 10 mm; and the first direction is an extension direction of a coupling position between the first metal member and the first protrusion portion, and the second direction is perpendicular to the first direction.

6. The wearable device according to claim 5, wherein the dimension D1 of the first metal member in the second direction is less than or equal to 9 mm and greater than or equal to 6 mm.

7. The wearable device according to claim 3, wherein the side frame comprises a second protrusion portion; and the wearable device comprises a second metal member, the second metal member is coupled to the second protrusion portion, and a dimension of the second metal member is less than a quarter of the first wavelength.

8. The wearable device according to claim 7, wherein the side frame comprises a second side frame portion, and the second protrusion portion protrudes from an outer surface of the second side frame portion; and the first radiator comprises the second side frame portion.

9. The wearable device according to claim 7 or 8, wherein a dimension L2 of the second metal member in a first direction is greater than or equal to 8 mm, and / or a dimension D2 of the second metal member in a second direction is less than or equal to 10 mm; and the first direction is an extension direction of a coupling position between the second metal member and the second protrusion portion, and the second direction is perpendicular to the first direction.

10. The wearable device according to claim 9, wherein the dimension D2 of the second metal member in the second direction is less than or equal to 9 mm and greater than or equal to 6 mm.

11. The wearable device according to any one of claims 7 to 10, wherein a first ground point is disposed on the side frame, the first ground point is configured to ground the side frame, and the first ground point and the first feed point divide the side frame into two parts with different lengths.

12. The wearable device according to claim 11, wherein a second ground point different from the first ground point is disposed on the side frame, the second ground point is configured to ground the side frame, the first radiator comprises a third side frame portion between the first ground point and the second ground point, and the first feed point is disposed on the third side frame portion.

13. The wearable device according to claim 12, wherein a position of the first protrusion portion on the side frame at least partially falls on the third side frame portion, and is located between the first ground point and the first feed point.

14. The wearable device according to claim 12 or 13, wherein a position of the second protrusion portion on the side frame at least partially falls on the third side frame portion, and is located between the second ground point and the first feed point.

15. The wearable device according to any one of claims 12 to 14, wherein the wearable device further comprises a second antenna, and a second feed point is disposed on the side frame; the second antenna comprises a second feed circuit, and the second feed circuit is coupled to the second feed point; and the side frame is divided into the third side frame portion and a fourth side frame portion by the first ground point and the second ground point, the first feed point is located on the third side frame portion, and the second feed point is located on the fourth side frame portion.

16. The wearable device according to any one of claims 1 to 15, wherein the operating frequency band of the first antenna comprises the first frequency band and a second frequency band, and a frequency of the first frequency band is lower than a frequency of the second frequency band; the wearable device further comprises a third metal member, the first metal member is located between the third metal member and the first protrusion portion, and the third metal member and the first metal member are spaced apart; the wearable device further comprises a filtering structure, and the filtering structure is coupled between the first metal member and the third metal member; and the first radiator and the first metal member are configured to generate first resonance, the first radiator, the first metal member, and the second metal member are configured to generate second resonance, a resonance frequency band of the second resonance comprises the first frequency band, and a resonance frequency band of the first resonance comprises the second frequency band.

17. The wearable device according to any one of claims 1 to 16, wherein the wearable device is a watch or a band, the side frame is in a ring shape, and an inner diameter is between 35 mm and 50 mm.

18. The wearable device according to any one of claims 1 to 17, wherein no insulation fracture is provided on the side frame.

19. The wearable device according to any one of claims 1 to 18, wherein the first protrusion portion is a lug on the side frame.

20. The wearable device according to claim 19, wherein a wristband of the wearable device comprises a link, and the first metal member comprises at least a part of the link.

Images