Wearable device

Abstract

The embodiment of the invention discloses wearable equipment, and relates to the technical field of electronic equipment. The invention aims to improve the radiation efficiency of the antenna of the wearable device. According to the specific scheme, the wearable device comprises a display screen, a rear shell, a frame and a first antenna. A first conductive part of the frame serves as a first radiator of the first antenna, the frame and a second radiator of the first antenna are arranged at an interval, the second radiator is located on the side, facing the rear shell, of the frame, and at least part of the vertical projection of the second radiator on a reference plane is located outside the vertical projection of the conductive part of the frame on the reference plane. And the reference surface is parallel to the thickness direction of the display screen. According to the wearable device, the electric field of the internal area surrounded by the frame is low, the loss power of the first antenna in the internal area is reduced, and the radiation efficiency of the first antenna is improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and particularly to a wearable device. Background Art

[0002] With the development of mobile communication technology, the application of wearable devices has become increasingly widespread, such as smart bracelets, earphones, and smart watches. Among them, an important application of wearable devices is inseparable from the communication function, and the communication function requires an antenna to transmit or receive electromagnetic signals. At present, the antenna of a wearable device has relatively large energy loss due to the influence of conductive components (such as components) inside the device. The energy loss causes the communication performance of the antenna to decline. Therefore, the communication function of wearable devices needs to be improved. Summary of the Invention

[0003] An embodiment of this application provides a wearable device, aiming to improve the radiation efficiency of the antenna of the wearable device.

[0004] To achieve the above object, this application adopts the following technical solutions.

[0005] In a first aspect, an embodiment of this application provides a wearable device. The wearable device includes a display screen, a rear case, a frame, a floor, and a first antenna. The frame is circumferentially connected between the rear case and the display screen; the frame includes a first conductive part. The first antenna includes a first radiator, a second radiator, and a first feeding part. The first conductive part serves as the first radiator; the first feeding part is used to feed the first radiator or the second radiator; the second radiator is electrically connected to the first radiator or the floor; wherein, the maximum width of the second radiator is greater than or equal to 0.5 mm. The frame and the second radiator are spaced apart. The second radiator is located on the side of the frame facing the rear case in the thickness direction of the display screen. There is a first gap between the first conductive part and the second radiator. At least part of the vertical projection of the second radiator on a first reference plane is located outside the vertical projection of the conductive part of the frame on the first reference plane. The first reference plane is parallel to the thickness direction of the display screen. Thus, the second radiator can disperse the current flowing through the first radiator. Compared with an example without the second radiator, when the wearable device is worn on the user's wearing part, the electric field between the wearing part and the second radiator increases, and the loss power of the wearing part to the first antenna increases. The current intensity in the internal area surrounded by the frame decreases. Also, since components such as printed circuit boards in the internal area surrounded by the frame include conductive materials, the loss power of the conductive materials located in the aforementioned area to the first antenna decreases. Also, since the increase in the loss power of the wearing part to the first antenna is less than the decrease in the loss power of the conductors in the aforementioned area to the first antenna. Then the loss power of the first antenna decreases, and the radiation efficiency increases.

[0006] In combination with the first aspect, in some realizable ways, when the wearable device is worn on the user's wearing part, the second radiator is at least partially located between the wearing part and the second radiator. Thus, the setting of the second radiator can reduce the electric field inside the frame, reduce the power loss of the first antenna caused by the conductive material inside the frame, and improve the radiation efficiency of the first antenna.

[0007] In combination with the first aspect, in some realizable ways, the material of the rear shell is a non-conductive material.

[0008] In combination with the first aspect, in some realizable ways, the vertical projection of the second radiator on the first reference plane and the vertical projection of the conductive part of the frame on the first surface do not intersect. In this way, the setting of the second radiator can further reduce the electric field strength in the internal area surrounded by the frame and improve the radiation efficiency of the first antenna.

[0009] In combination with the first aspect, in some realizable ways, the second radiator is attached to the surface of the rear shell facing the frame; or, the second radiator is attached to the surface of the rear shell facing away from the frame; or, the second radiator is embedded in the rear shell. Thus, the rear shell has a supporting effect on the second radiator. In an embodiment where the second radiator is a conductive film, the second radiator is attached to the surface of the rear shell facing the frame, and the setting of the second radiator has little impact on the volume of the entire wearable device, and the integration degree of the wearable device is relatively high.

[0010] In combination with the first aspect, in some realizable ways, the second radiator is electrically connected to the current maximum point of the first radiator. Thus, the effect of the second radiator on dispersing the current on the first radiator can be enhanced. The degree of decrease in the electric field strength in the internal area surrounded by the frame is increased, and the radiation efficiency of the first antenna is improved.

[0011] In combination with the first aspect, in some realizable ways, the second radiator is electrically connected to the connection point of the first radiator, and the radiator length between the connection point and at least one ground point of the first radiator is less than or equal to 30 mm. The current maximum point generated by the first antenna in the working frequency band is in the area where the distance between the ground points of the first radiator is less than or equal to 30 mm. The connection point of the second radiator and the first radiator is at or near the aforementioned current maximum point, and the current shunted from the first radiator to the second radiator is relatively large, which can enhance the effect of the second radiator on dispersing the current on the first radiator. The degree of decrease in the electric field strength in the internal area surrounded by the frame is increased, and the radiation efficiency of the first antenna is improved.

[0012] In combination with the first aspect, in some implementable ways, the first antenna further includes a first electrical connector. The opposite ends of the first electrical connector are electrically connected to the first radiator and the second radiator respectively. Alternatively, the opposite ends of the first electrical connector are electrically connected to the ground plane and the second radiator respectively. In this way, through the arrangement of the first electrical connector, the second radiator can be electrically connected to the first radiator or the ground plane of the wearable device.

[0013] In combination with the first aspect, in some implementable ways, along any direction perpendicular to the thickness direction of the display screen, the size of the first electrical connector is less than or equal to 5 mm. Thus, the current between the first radiator and the second radiator can achieve circuit conduction through the first electrical connector with a relatively small size. The second radiator has the effect of dispersing the current flowing from the first antenna to the first radiator, thereby weakening the electric field strength in the internal area surrounded by the frame and improving the radiation efficiency of the first antenna.

[0014] In combination with the first aspect, in some implementable ways, the first antenna includes a plurality of the first electrical connectors, and the plurality of the first electrical connectors are arranged at intervals, and the distance between two adjacent first electrical connectors is greater than or equal to 5 mm. Thus, the distance between two adjacent first electrical connectors is relatively far, and each first electrical connector can disperse the current on the first radiator. The second radiator has a strong ability to reduce the electric field strength in the internal area surrounded by the frame, and the effect of the second radiator on improving the radiation efficiency of the first antenna is obvious.

[0015] In combination with the first aspect, in some implementable ways, the second radiator is a conductive coating. The conductive coating has the advantage of small occupied space.

[0016] In combination with the first aspect, in some implementable ways, the second radiator is a closed-loop structure. Alternatively, the second radiator is an open-loop structure.

[0017] In combination with the first aspect, in some implementable ways, the maximum width of the closed-loop structure is greater than or equal to 0.5 mm. Alternatively, the maximum width of the open-loop structure is greater than or equal to 0.5 mm. Thus, the width of the ring structure is relatively wide, the second radiator has a strong ability to reduce the electric field strength in the internal area surrounded by the frame, and the effect of the second radiator on improving the radiation efficiency of the first antenna is obvious.

[0018] In combination with the first aspect, in some implementable ways, the second radiator is a strip structure, and at least one end of the opposite ends of the strip structure is a free end.

[0019] In combination with the first aspect, in some implementable ways, a plurality of through holes are provided on the second radiator.

[0020] In combination with the first aspect, in some implementable ways, the vertical projection of the second radiator on the second reference plane at least partially overlaps with the vertical projection of the conductive part of the frame on the second reference plane, and the second reference plane is perpendicular to the thickness direction of the display screen. Then, at least a part of the outer contour of the second radiator extends to one side of the frame. When the wearable device is worn on the user's wearing part, the wearing part, at least a part of the outer contour of the aforementioned second radiator, and the conductive part of the frame are spaced apart in the z direction. The setting of the second radiator will promote the further weakening of the electric field within the range enclosed by the frame for the first antenna, thereby reducing the electric field within the area enclosed by the frame for the first antenna and improving the radiation efficiency of the first antenna.

[0021] In combination with the first aspect, in some implementable ways, the wearable device further includes: a second antenna. The second antenna includes a third radiator and a second feeding part, the frame includes a second conductive part, and the second conductive part serves as the third radiator, and the second feeding part is used to feed the third radiator. The wearable device can be a multi-antenna structure.

[0022] In combination with the first aspect, in some implementable ways, the second antenna further includes a second electrical connector, and opposite ends of the second electrical connector are electrically connected to the third radiator and the second radiator respectively. The second radiator can improve the radiation efficiency of the second antenna.

[0023] In combination with the first aspect, in some implementable ways, the second antenna further includes a fourth radiator, and the fourth radiator is electrically connected to the third radiator or the ground plane of the wearable device. The frame is spaced apart from the fourth radiator, the fourth radiator is located on the side of the frame facing the rear shell in the thickness direction of the display screen, there is a second gap between the second conductive part and the fourth radiator, and at least a part of the vertical projection of the fourth radiator on the first reference plane is located outside the vertical projection of the conductive part of the frame on the first reference plane. Thus, the fourth radiator can weaken the electric field within the area enclosed by the frame, reduce the power of conductor loss within the area enclosed by the frame for the second antenna, and improve the radiation efficiency of the second antenna.

[0024] In combination with the first aspect, in some implementable ways, the dimension of the first gap in the thickness direction of the display screen is greater than or equal to 0.5 mm and less than or equal to 15 mm.

[0025] In combination with the first aspect, in some implementable ways, the dimension of the second gap in the thickness direction of the display screen is greater than or equal to 0.5 mm and less than or equal to 15 mm.

[0026] In combination with the first aspect, in some feasible embodiments, the wearable electronic device further includes: a charging coil. The charging coil is connected to a side of the rear case facing the frame; the second radiator is electrically isolated from the charging coil. Thus, the wearable electronic device can have a charging function.

[0027] In a second aspect, an embodiment of the present application provides a wearable device. The wearable device includes a display screen, a rear case, a frame, and a first antenna. The frame is located between the rear case and the display screen, and two opposite sides of the frame are circumferentially connected to the rear case and the display screen respectively; the frame includes a first conductive part. The first antenna includes a first radiator and a first feeding part, and the first conductive part serves as the first radiator; the first feeding part is used to feed the first radiator. The rear case is made of a conductive material, and an annular gap is provided on the rear case, and the annular gap penetrates the rear case along the thickness direction of the display screen. Thus, the annular gap provided on the rear case can also weaken the electric field of the first antenna in the area surrounded by the frame, reduce the energy loss in the area surrounded by the frame, and improve the radiation efficiency of the first antenna. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of a wearable device.

[0029] Figure 2a It is a schematic structural diagram of the wearable device provided by the embodiment of the present application.

[0030] Figure 2b It is an exploded structural diagram of the wearable device provided by the embodiment of the present application.

[0031] Figure 3 It is a schematic structural diagram of an antenna structure provided by the embodiment of the present application.

[0032] Figure 4 It is an exploded structural diagram of the frame and the second radiator provided by the embodiment of the present application.

[0033] Figure 5 It is a schematic structural diagram of the frame and the second radiator provided by the embodiment of the present application.

[0034] Figure 6 It is a schematic diagram of the shapes of various second radiators provided by the embodiment of the present application.

[0035] Figure 7 It is a simplified structural diagram of the antenna structure provided by the embodiment of the present application.

[0036] Figure 8 It is a schematic structural diagram of another second antenna and the first antenna provided by the embodiment of the present application.

[0037] Figure 9Another structural schematic diagram of the frame and the rear case provided by the embodiment of the present application.

[0038] Figure 10 For the Figure 2b radiation efficiency curve graph of the first antenna in the foregoing.

[0039] Figure 11a For the Figure 5 radiation efficiency curve graph of the first antenna in the foregoing.

[0040] Figure 11b For the Figure 5 radiation efficiency curve graph of the second antenna in the foregoing.

[0041] Figure 12 For the Figure 5 isolation curve graph of the first antenna and the second antenna in the foregoing.

[0042] In the figure: 100 - wearable device; 11 - wearing part; 13 - cover plate; 14 - button; 15 - sensor; 110 - display screen; 120 - frame; 130 - rear case; 140 - printed circuit board; 200 - first antenna; 201 - floor; 210 - first radiator; 220 - second radiator; 230 - first feeding part; 202 - first gap; 203 - first electrical connector; 170 - charging coil; 211 - first grounding point; 212 - second grounding point; 221 - first electrical connection point; 300 - second antenna; 310 - third radiator; 320 - second feeding part; 330 - fourth radiator; 301 - second electrical connector; 123 - non-conductive part; 131 - annular slit. Detailed implementation manners

[0043] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0044] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0045] In addition, in the present application, orientation terms such as "upper" and "lower" are defined relative to the orientation in which the components in the drawings are schematically placed. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they may change accordingly with the change of the orientation in which the components in the drawings are placed.

[0046] The technical solution provided by the embodiments of this application is applicable to the UE 103 that adopts one or more of the following communication technologies: Bluetooth (BT) communication technology, Global Positioning System (GPS) communication technology, Wireless Fidelity (WiFi) communication technology, Global System for Mobile Communications (GSM) communication technology, Wideband Code Division Multiple Access (WCDMA) communication technology, Long Term Evolution (LTE) communication technology, 5G communication technology, and other future communication technologies, etc.

[0047] Hereinafter, the terms that may appear in the embodiments of this application will be explained.

[0048] Connection / Connected: It may refer to a mechanical connection relationship or a physical connection relationship. That is, A is connected to B or A is connected with B may mean that there are fastening components (such as screws, bolts, rivets, etc.) between A and B, or A and B are in contact with each other and it is difficult to separate A and B.

[0049] Coupling: It can be understood as direct coupling and / or indirect coupling. "Coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection", which is understood as physical contact and electrical conduction between components; it can also be understood as a form of connection between different components in a circuit structure through physical lines such as copper foils or wires on a printed circuit board (PCB) that can transmit electrical signals; "indirect coupling" can be understood as electrical conduction between two conductors in a non-contact manner through air. In one embodiment, indirect coupling can also be called capacitive coupling. For example, signal transmission is achieved through the coupling between the gaps separated by two conductive parts to form an equivalent capacitance.

[0050] Relative / Relatively arranged: A is relatively arranged with B may mean that A and B are arranged face to face (opposite to, or face to face). For example, when two radiators are relatively arranged, at least part of the areas of these two radiators overlap in a certain direction. In one embodiment, the two relatively arranged radiators are adjacent and there are no other radiators or conductors other than the antenna structure between them.

[0051] Radiator, or antenna element: It is a device in an antenna used to receive / transmit electromagnetic wave radiation. In some cases, "antenna" is narrowly understood as a radiator, which converts the guided wave energy from a transmitter into radio waves, or converts radio waves into guided wave energy, for radiating and receiving radio waves. The modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted through the feeder line to the transmitting radiator, and through the radiator, it is converted into electromagnetic wave energy of a certain polarization and radiated in the required direction. The receiving radiator converts the electromagnetic wave energy of a certain polarization from a specific direction in space back into modulated high-frequency current energy, and transmits it through the feeder line to the input end of the receiver.

[0052] The radiator (or antenna element) can include conductors with specific shapes and sizes, such as linear or sheet-like, etc. The present application does not limit the specific shape. In one embodiment, the linear radiator can be simply referred to as a wire antenna. In one embodiment, the linear radiator can be implemented by a conductive frame, and can also be referred to as a frame antenna. In one embodiment, the linear radiator can be implemented by a support conductor, and can also be referred to as a support antenna. In one embodiment, the wire diameter (e.g., including thickness and width) of the linear radiator, or the radiator of the wire antenna, is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and the length can be comparable to the wavelength (e.g., the dielectric wavelength) (e.g., the length is around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of wire antennas include dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, inverted-F antennas (also known as IFA, Inverted F Antenna). For example, for a dipole antenna, each dipole antenna usually includes two radiation elements, and each element is fed by a feeding part from the feeding end of the radiation element. For example, an inverted-F antenna (Inverted-F Antenna, IFA) can be regarded as obtained by adding a grounding path to a monopole antenna. The IFA antenna has a feeding point and a grounding point, and is called an inverted-F antenna because its side view is in the shape of an inverted F. In one embodiment, the sheet radiator can include a microstrip antenna, or a patch antenna, such as a planar inverted-F antenna (also known as PIFA, Planar Inverted F Antenna). In one embodiment, the sheet radiator can be implemented by a planar conductor (such as a conductive sheet or a conductive coating, etc.). In one embodiment, the sheet radiator can include a conductive sheet, such as a copper sheet, etc. In one embodiment, the sheet radiator can include a conductive coating, such as silver paste, etc. The shapes of the sheet radiator include circular, rectangular, annular, etc. The present application does not limit the specific shape. The structure of a microstrip antenna generally consists of a dielectric substrate, a radiator, and a ground plane, where the dielectric substrate is disposed between the radiator and the ground plane.

[0053] The radiator (or antenna stub) may also include a slot or slit formed on a conductor, for example, a closed or semi-closed slot or slit formed on a grounded conductor surface. In one embodiment, the slotted or slit radiator may be simply referred to as a slot antenna or a slit antenna. In one embodiment, the radial dimension (e.g., including the width) of the slot or slit of the slot antenna / slit antenna is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and the length dimension may be comparable to the wavelength (e.g., the dielectric wavelength) (e.g., the length is around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, the radiator with a closed slot or slit may be simply referred to as a closed slot antenna. In one embodiment, the radiator with a semi-closed slot or slit (e.g., adding an opening to the closed slot or slit) may be simply referred to as an open slot antenna. In some embodiments, the shape of the slit is elongated. In some embodiments, the length of the slit is about half a wavelength (e.g., the dielectric wavelength). In some embodiments, the length of the slit is about an integer multiple of the wavelength (e.g., one dielectric wavelength). In some embodiments, the slit can be fed by a transmission line bridging one or both of its sides, whereby a radio frequency electromagnetic field is excited on the slit and electromagnetic waves are radiated into space. In one embodiment, the radiator of the slot antenna or slit antenna can be realized by a conductive frame grounded at both ends, and can also be referred to as a frame antenna; in this embodiment, it can be considered that the slot antenna or slit antenna includes a linear radiator, the linear radiator is spaced from the floor and grounded at both ends of the radiator, thereby forming a closed or semi-closed slot or slit. In one embodiment, the radiator of the slot antenna or slit antenna can be realized by a support conductor grounded at both ends, and can also be referred to as a support antenna.

[0054] Ground / Floor: It can generally refer to at least a part of any ground layer, ground board, or ground metal layer, etc. inside an electronic device (such as a smart bracelet), or at least a part of any combination of the above-mentioned ground layer, ground board, or ground component, etc. "Ground / Floor" can be used for grounding components inside an electronic device. In one embodiment, "Ground / Floor" may include any one or more of the following: the ground layer of the circuit board of the electronic device, the ground board formed by the middle frame of the electronic device, the ground metal layer formed by the metal film under the screen, the conductive ground layer of the battery, and the conductive or metal components electrically connected to the above-mentioned ground layer / ground board / metal layer. In one embodiment, the circuit board can be a printed circuit board, such as an 8-layer, 10-layer, or 12- to 14-layer board with 8, 10, 12, 13, or 14 layers of conductive materials, or components separated and electrically insulated by dielectric layers or insulating layers such as fiberglass, polymers, etc. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, and the trace layer and the ground layer are electrically connected through vias. In one embodiment, components such as a display, a touch screen, an input button, a transmitter, a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on the circuit board or connected to the circuit board; or electrically connected to the trace layer and / or the ground layer in the circuit board. For example, a radio frequency source is disposed on the trace layer.

[0055] Any of the above-mentioned ground layer, ground board, or ground metal layer is made of a conductive material. In one embodiment, the conductive material can be any one of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, cloth impregnated with graphite powder, a substrate coated with graphite, a copper-plated substrate, a brass-plated substrate, and an aluminum-plated substrate. Those skilled in the art can understand that the ground layer / ground board / ground metal layer can also be made of other conductive materials.

[0056] Grounding: It refers to achieving coupling with the above-mentioned ground / floor through a grounding structure and / or a grounding circuit. In one embodiment, grounding can be through physical grounding, for example, through a partial structural member of a printed circuit board to achieve physical grounding at a specific position on the border (or called, physical ground). In one embodiment, grounding can be through device grounding, for example, through devices such as capacitors / inductors / resistors connected in series or in parallel for grounding (or called, device ground).

[0057] Resonant frequency: The resonant frequency is also called the resonance frequency. The resonant frequency can have a frequency range, that is, the frequency range where resonance occurs. The resonant frequency can be the frequency range where the return loss characteristic is less than -6 dB. The strongest point of resonance can be called the resonance point, and the frequency corresponding to the resonance point is the center frequency point frequency. The return loss characteristic of the center frequency can be less than -20 dB. It should be understood that unless otherwise specified, when the present application mentions that the antenna / radiator generates "the first / second... resonance", among which, the first resonance should be the fundamental mode resonance generated by the antenna / radiator, or in other words, the resonance with the lowest frequency generated by the antenna / radiator. It should be understood that the antenna / radiator can generate one or more antenna modes according to the specific design, and each antenna mode can correspondingly generate a fundamental mode resonance.

[0058] Resonant frequency band: The range of the resonant frequency is the resonant frequency band, and the return loss characteristic of any frequency point within the resonant frequency band can be less than -4 dB.

[0059] Communication frequency band / operating frequency band: No matter what type of antenna, it always operates within a certain frequency range (frequency band width). For example, an antenna supporting the B40 frequency band has an operating frequency band including frequencies within the range of 2300 MHz to 2400 MHz, or in other words, the operating frequency band of this antenna includes the B40 frequency band.

[0060] The resonant frequency band and the operating frequency band can be the same or can partially overlap. In one embodiment, one or more resonant frequency bands of the antenna can cover one or more operating frequency bands of the antenna.

[0061] In the embodiments of the present application, such limitations as parallel, perpendicular, same (for example, same length, same width, same structure, etc.) are all in terms of the current process level, rather than absolute and strict definitions in the mathematical sense. There can be a deviation of a predetermined angle (such as ±5°, ±10°) between two antenna elements that are parallel or perpendicular to each other. In one embodiment, the predetermined angle can be an angle within the range of ±10°, for example, the predetermined angle deviation is ±5°.

[0062] Radiation efficiency: It refers to the ratio of the power radiated by the antenna into space (that is, the power effectively converted into electromagnetic waves) to the active power input to the antenna. Among them, the active power input to the antenna = the input power of the antenna - the loss power; the loss power mainly includes the return loss power, the ohmic loss power of the metal, and / or the dielectric loss power. Both the metal loss and the dielectric loss are factors affecting the radiation efficiency.

[0063] Those skilled in the art can understand that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between it and dB. The closer the efficiency is to 0 dB, the better the efficiency of the antenna is characterized.

[0064] dB: Decibel, which is a logarithmic concept with base 10. Decibel is only used to evaluate the proportional relationship between one physical quantity and another, and it has no physical dimension itself. If the ratio between two quantities increases by 10 times, their difference can be expressed as 10 decibels. For example: A = "100", B = "10", C = "5", D = "1", then, A / D = 20dB; B / D = 10dB; C / D = 7dB; B / C = 3dB. That is to say, a difference of 10 decibels between two quantities means a difference of 10 times, a difference of 20 decibels means a difference of 100 times, and so on. A difference of 3dB means a difference of 2 times between two quantities.

[0065] dBi: Usually mentioned together with dBd. dBi and dBd are units of power gain. Both are relative values, but the reference benchmarks are different. The reference benchmark for dBi is an omnidirectional antenna; the reference benchmark for dBd is a dipole. Generally, it is considered that dBi and dBd represent the same gain, and the value expressed in dBi is 2.15 dBi larger than that expressed in dBd. For example: For an antenna with a gain of 16 dBd, when its gain is converted to the unit of dBi, it is 18.15 dBi. Generally, the decimal part is ignored, and it is 18 dBi.

[0066] Antenna return loss: It can be understood as the ratio of the signal power reflected back to the antenna port through the antenna circuit to the transmission power of the antenna port. The smaller the reflected signal, the larger the signal radiated into space through the antenna, and the higher the radiation efficiency of the antenna. The larger the reflected signal, the smaller the signal radiated into space through the antenna, and the lower the radiation efficiency of the antenna.

[0067] Antenna return loss can be represented by the S11 parameter. S11 is one of the S parameters. S11 represents the reflection coefficient, and this parameter can characterize the pros and cons of the antenna transmission efficiency.

[0068] In one embodiment, the S11 diagram can be understood as a schematic diagram used to represent the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 diagram in the part less than -4 dB can be understood as the resonance frequency range generated by the antenna. The S11 parameter is usually negative. The smaller the S11 parameter, the smaller the antenna return loss, the smaller the energy reflected back by the antenna itself, which means that the more energy actually enters the antenna, and the higher the system efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, and the lower the system efficiency of the antenna.

[0069] Isolation: It refers to the ratio of the signal received by another antenna when one antenna transmits a signal to the signal of the transmitting antenna. Isolation is a physical quantity used to measure the degree of mutual coupling between antennas. Assuming that two antennas form a two-port network, then the isolation between the two antennas is S21 and S12 between the antennas. The antenna isolation can be represented by the S21 and S12 parameters, which also belong to one of the S parameters. The S21 and S12 parameters are usually negative. The smaller the S21 and S12 parameters, the greater the isolation between the antennas and the smaller the degree of mutual coupling between the antennas; the larger the S21 and S12 parameters, the smaller the isolation between the antennas and the greater the degree of mutual coupling between the antennas. The isolation of the antenna depends on the antenna radiation pattern, the spatial distance between the antennas, the antenna gain, etc.

[0070] The Near Field Communication (NFC) protocol operates on a radio frequency band of 13.56 MHz, enabling mobile communication devices to establish radio frequency communication by bringing these devices close to each other. The use of NFC in mobile devices has increased in various mobile devices, such as cellular phones and accessories. NFC devices can be used in three modes: the active mode for tag reading and pairing, the passive mode for card emulation / payment, and the shared end-to-end mode. Currently, due to their small size, wearable devices lack a sufficient artificial input interface. The present invention provides NFC for wearable devices to implement functions such as electronic wallets, the end-to-end (peer-to-peer, P2P) mode for information interaction, authentication and access control, and the reader / writer mode for reading information. Wearable devices are closely related to human behavior, and aesthetics play an important role in the design of wearable devices, such as the design of smart watches.

[0071] Figure 1 It is a schematic structural diagram of a wearable device 100. The wearable device 100 is a portable device that can be directly worn on the user's body or integrated into the user's clothes or accessories. The wearable device can include, but is not limited to, watches, bracelets, smart wristbands, smart glasses, finger rings, helmets, and so on. Figure 1 Taking the wearable device 100 as a bracelet as an example for description. Figure 1 In the figure, the wearable device 100 is in a state of being worn on the user's wearing part 11. The embodiment of the present application does not limit the user's wearing part 11 either. Exemplarily, the user's wearing part 11 can be the arm, the arm, or the head, etc.

[0072] Figure 2aA schematic diagram of the structure of a wearable device 100 provided in an embodiment of the present application. The wearable device 100 may include: a display 110, a frame 120, and a rear shell 130. The display 110 may be disposed in the frame 120, and the frame 120 surrounds the display 110 to fix the display 110. The display surface of the display 110 is located on the side away from the rear shell 130. The rear shell 130 is also called the rear cover, and the rear shell 130 is located on the side of the frame 120 away from the display 110. The frame 120 is circumferentially connected between the display 110 and the rear shell 130.

[0073] For ease of description, the thickness direction of the display screen 110 is defined as the z direction. In other words, the rear housing 130 and the display screen 110 are stacked along the z direction. It is understood that in the embodiment where the display screen 110 is a curved screen, the flat portion of the display screen 110 is perpendicular to the z direction.

[0074] The material of the frame 120 may include a conductive part, and the material of the conductive part includes a conductive material, and the conductive material includes, for example, a metal material. In some embodiments, the frame 120 may be a conductive part, for example, forming the appearance of a metal frame, which is suitable for metal industrial design (ID). In other embodiments, the conductive part is located on the outer surface of the frame 120, thereby forming the appearance of a metal frame. In some other embodiments, the conductive part is located on the inner surface of the frame 120. In these implementations, the conductive part of the frame 120 can be used as an antenna radiator of the wearable device 100. It is understandable that the conductive part arranged on the inner surface of the frame 120 is arranged in contact with the non-conductive material of the frame 120 to facilitate antenna radiation, and the conductive material and the non-conductive material should be regarded as part of the frame 120.

[0075] The display screen 110 may be a liquid crystal display (LCD), an organic light emitting diode (OLED), or a micro or mini light emitting diode (LED).

[0076] The present application does not limit the shape of the display screen 110. For example, the display screen 110 may be circular or rectangular. The present application embodiment does not limit the shape of the frame 120. It may be circular, square, polygonal, or other regular or irregular shapes. For simplicity of description, the following embodiments are described by taking the frame 120 as a circular shape as an example.

[0077] Figure 2bThis is a schematic diagram of the decomposed structure of the wearable device 100 provided in the embodiment of the present application. Figure 2b In some embodiments, in order to protect the display screen 110 , the wearable device 100 may further include a cover 13 covering the display surface of the display screen 110 .

[0078] It is understandable that the contour of the cover plate 13 can match the contour of the display screen 110. For example, the outer contour of the cover plate 13 is circular. The cover plate 13 can be made of transparent material, for example, the material of the cover plate 13 includes sapphire crystal, glass or plastic.

[0079] In some embodiments, the user can interact with the wearable device 100 through the cover plate 13 or the display screen. For example, the cover plate 13 or the display screen can receive the user's input operation, and make corresponding output in response to the input operation. For example, the user can select (or otherwise) open or edit the graphic by touching or pressing the graphic position on the display screen.

[0080] In some embodiments, a receiving space is formed between the frame 120 and the display screen 110 , which can accommodate a combination of multiple electronic components to realize various functions of the wearable device 100 .

[0081] Exemplarily, the wearable device 100 further includes a button 14, and the accommodation space between the frame 120 and the display screen 110 can accommodate part of the button 14, and the exposed part of the button 14 is convenient for the user to touch. As one of the input devices, the button 14 allows the user to press, move or tilt the button to perform input operations. Exemplarily, the button can be installed on the side surface A of the frame 120, one end of the button 14 is located outside the frame 120, and the other end of the button passes through the frame 120 and is located inside the frame 120.

[0082] In some embodiments, the wearable device 100 further includes a sensor 15, and when the wearable device 100 is worn on the user's wearing part, the sensor 15 is used to detect the user's health information. Health information includes, but is not limited to, information such as heart rate, body temperature, or blood pressure. The types of sensors include, but are not limited to, temperature sensors capable of detecting body temperature, vibration sensors or photoelectric sensors capable of detecting heart rate, or pressure sensors for detecting blood pressure, etc. Exemplarily, the sensor 15 is connected to the rear shell 130, and at least part of the sensor 15 is located on the side of the rear shell 130 facing away from the display screen 110. When the wearable device 100 is worn on the user's wearing part, the sensor 15 faces the wearing part, and the sensor 15 contacts the wearing part.

[0083] Exemplarily, the chip of the wearable device 100 can be connected to the sensor, so as to convert the signal detected by the sensor into corresponding health indicators. The chip may include one or more processing units. For example, it may include an application processor (AP), a modem processor, a memory, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc.

[0084] It can be understood that when the wearable device 100 is worn on the user's wearing part, the sensor 15 and the wearing part may be in contact for a preset time and not in contact for a preset time. The embodiments of the present application do not limit this.

[0085] Exemplarily, the wearable device 100 further includes a printed circuit board 140. The printed circuit board 140 can be disposed between the rear case 130 and the display screen 110. The printed circuit board 140 can adopt a flame-retardant material (FR-4) dielectric board, or a Rogers dielectric board, or a hybrid dielectric board of Rogers and FR-4, etc. Here, FR-4 is a code for a flame-retardant material grade, and the Rogers dielectric board is a high-frequency board. Electronic components, such as radio frequency chips, etc., are carried on the printed circuit board 140.

[0086] In one embodiment, a conductive layer can be provided on the printed circuit board 140. The conductive layer can be used for grounding the electronic components carried on the printed circuit board 140, and can also be used for grounding other components, such as a bracket antenna, a frame antenna, etc. This metal layer can be called a floor, or a ground plane, or a grounding layer. The wearable device 100 may further include a battery (not shown in the figure). The battery can be disposed between the rear case 130 and the display screen 110.

[0087] In some embodiments, the frame 120 of the wearable device 100 is used as the radiator of the antenna. By setting a feeding point on the frame 120, the antenna structure can generate radiation. Among them, the loss power of the antenna mainly includes the return loss power, the ohmic loss power of the metal, and the dielectric loss power. Increasing the loss power of the antenna is one of the means to improve the radiation efficiency of the antenna.

[0088] The wearable device provided by the embodiments of the present application can reduce the dielectric loss power of the antenna to improve the radiation efficiency of the antenna.

[0089] Please return to Figure 2b, the wearable device 100 further includes a first antenna 200, and the first antenna 200 includes a first radiator 210, a second radiator 220, and a first feeding portion 230. The second radiator 220 is disposed at an interval from the frame 120, and the second radiator 220 is located on a side of the frame 120 facing the rear case 130 in the thickness direction (z direction) of the display screen 110.

[0090] Wherein, the maximum width of the second radiator 220 is greater than or equal to 0.5 mm. The width of the second radiator 220 refers to the width of the continuous conductor on the second radiator 220 in a direction perpendicular to the thickness direction of the second radiator 220. If there are holes (slits or insulators) on the second radiator 220 in this direction, the width of the second radiator 220 is the width of the conductor between two adjacent holes (slits or insulators) in this direction.

[0091] Wherein, the foregoing second radiator 220 is located on a side of the frame 120 facing the rear case 130 in the z direction, which does not limit that the projections of the second radiator 220 and the frame 120 in the z direction overlap. Taking Figure 3 the orientation relationship in as an example, the second radiator 220 may be located below the frame 120, including that the second radiator 220 is located directly below and obliquely below the frame 120.

[0092] Figure 2b In the example of, the material of the rear case 130 is a non-conductive material. Exemplarily, the resistivity of the rear case 130 is in the range of 10 10 Ω·m (ohm·meter) to 10 22 Ω·m. For example, the material of the rear case 130 includes at least one of plastic, ceramic, or glass.

[0093] The embodiments of the present application do not limit the type of the first antenna 200. Exemplarily, the first antenna 200 may be a GNSS (global navigation satellite system) antenna (L1 band or L5 band), a BT (bluetooth) antenna, a Cell (cellular) antenna, or a WiFi (wireless fidelity) antenna, etc.

[0094] The embodiments of the present application do not limit the operating frequency band of the first antenna 200, and it can be set according to the function of the first antenna 200. Exemplarily, the operating frequency band of the first antenna 200 is in the range of 0.6 GHz - 6 GHz.

[0095] Figure 3 is a schematic structural diagram of an antenna structure provided by an embodiment of the present application. Please refer to Figure 3, the frame 120 includes a first conductive part, and the first conductive part serves as the first radiator 210. The first feeding part 230 is used to feed the first radiator 210 or the second radiator 220. The second radiator 220 is electrically connected to the first radiator 210 or the ground 201 of the wearable device 100. There is a first gap 202 between the first radiator 210 and the second radiator 220. At least part of the vertical projection of the second radiator 220 on the B surface of the first reference plane (as shown in Figure 4 is located outside the vertical projection of the conductive part of the frame 120 on the B surface of the first reference plane. The B surface of the first reference plane is parallel to the z direction.

[0096] The second radiator 220 is arranged at an interval from the frame 120, and the second radiator 220 is arranged on the side of the first radiator 210 close to the rear case 130. Also, because at least part of the vertical projection of the second radiator 220 on the B surface of the first reference plane (as shown in Figure 4 is located outside the vertical projection of the conductive part of the frame 120 on the B surface of the first reference plane. When the wearable device 100 is worn on the wearing part 11 of the user (as shown in Figure 1 ), at least part of the second radiator 220 is located between the wearing part and the second radiator 220. In other words, along the z direction, at least part of the first radiator 210 is located between the wearing part and the second radiator 220.

[0097] The second radiator 220 can disperse the current on the first radiator 210. Compared with the example without the second radiator 220, when the wearable device 100 is worn on the wearing part of the user, the electric field between the wearing part and the second radiator 220 increases, and the loss power of the wearing part to the first antenna 200 increases. The current intensity in the internal area surrounded by the frame 120 decreases. Also, since components such as the printed circuit board 140 in the internal area surrounded by the frame 120 include conductive materials, the loss power of the conductive materials located in the aforementioned area to the first antenna 200 decreases. Also, because the increase amount of the loss power of the wearing part to the first antenna 200 is less than the decrease amount of the loss power of the conductors in the aforementioned area to the first antenna 200. Then the loss power of the first antenna 200 decreases, and the radiation efficiency increases.

[0098] The aforementioned internal area surrounded by the frame 120 is the area surrounded by the inner wall of the frame 120. It can be understood that components such as the display screen 110 and the printed circuit board 140 are all located in the aforementioned internal area surrounded by the frame 120.

[0099] In some embodiments, the first feeding portion 230 is configured to feed the second radiator 220. Exemplarily, the radio frequency signal of a communication chip (such as a radio frequency chip) is fed into the second radiator 220 through the first feeding portion 230. Among them, the type of the communication chip can be set according to the type of the first antenna 200. For example, the communication chip may include a GNSS chip, a BT chip, a Cell (cellular) chip, a WiFi chip, etc.

[0100] In some other embodiments, the second radiator 220 is electrically connected to the ground plane 201.

[0101] It should be understood that the second radiator 220 is different from the charging coil of the wearable device 100 and is also different from the near field communication (NFC) coil. In one embodiment, the second radiator 220 is not electrically connected to the power management chip nor to the NFC chip.

[0102] At least a part of the second radiator 220 is suspended on the side of the first radiator 210 close to the rear shell 130. Herein, "suspended" means not being closely arranged or connected to other electrical conductors or magnetic conductors. Among them, the electrical conductors include the conductive parts of the middle frame, the conductive devices of the PCB, etc., and the magnetic conductors include ferrite, nanocrystalline, etc.

[0103] Figure 3 In the example, the material of the entire frame 120 includes conductive material. For example, the entire frame 120 is made of metal material. Thus, the entire part of the frame 120 is the conductive part of the frame 120. The first conductive part serves as the first radiator 210, then Figure 3 In the example, all parts of the frame 120 serve as the first radiator 210 of the first antenna 200. In other embodiments, the frame 120 includes connected conductive parts and non-conductive parts. The conductive parts include the first conductive part, and the first conductive part serves as the first radiator 210.

[0104] In the embodiments of the present application, there is no limitation on the size of the first gap 202 between the first radiator 210 and the second radiator 220. Exemplarily, the size of the first gap 202 in the z direction is h, where h is greater than or equal to 0.5 mm (millimeter) and h is less than or equal to 15 mm. For example, the size h of the first gap 202 in the z direction can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 2 mm, 4 mm, 5 mm, 6 mm, 7 mm, 9 mm, 10 mm, 12 mm, 13 mm, or 15 mm, etc. If the size of the aforementioned first gap 202 is small, the distance between the first radiator 210 and the second radiator 220 is close, and the coupling capacitance between the first radiator 210 and the second radiator 220 is large. The impedance value of the aforementioned coupling capacitance for electromagnetic waves with a relatively low frequency (e.g., less than 1.2 GHz) is small, and the small impedance value will cause the coupling capacitance to conduct, weakening the effect of the second radiator 220 in dispersing the current on the first radiator 210. The effect of the second radiator 220 in reducing the electric field strength in the internal area surrounded by the frame 120 is not good, and it has limited effect on improving the radiation efficiency of the first antenna 200. On the contrary, if the size of the first gap 202 is large (e.g., h is greater than or equal to 0.5 mm), the coupling capacitance between the first radiator 210 and the second radiator 220 is small. Within the operating frequency band of the first antenna 200, the coupling capacitance between the first radiator 210 and the second radiator 220 is not easily conducted. The effect of the second radiator 220 in dispersing the current on the first radiator 210 is obvious. The second radiator 220 reduces the electric field strength in the internal area surrounded by the frame 120, improving the radiation efficiency of the first antenna 200.

[0105] In the embodiments of the present application, there is no limitation on the shape of the first gap 202. The shape of the first gap 202 can be an irregular shape. The first gap 202 may have multiple sizes in the z direction. The aforementioned size h of the first gap 202 in the z direction is the maximum size of the first gap 202 in the z direction.

[0106] In the embodiments of the present application, there is no limitation on the material filled in the first gap 202. For example, the first gap 202 can be filled with solid materials such as plastic or rubber, or the first gap 202 can be filled with gas materials such as air, nitrogen, or argon. Alternatively, the first gap 202 can be filled with both solid materials and gas materials. In some embodiments, in order to increase the integration of the wearable device 100, other structures (such as sensors, etc.) of the wearable device 100 can be located in the first gap 202.

[0107] Please return to Figure 2b, the floor 201 of the wearable device 100 may be at least a part of any ground layer, or ground plane, or ground metal layer, etc. of the wearable device 100. For example, the floor 201 of the wearable device 100 may include any one or more of the following: the ground layer of the printed circuit board 140, the ground metal layer formed by the metal film on the side of the display screen 110 facing the rear shell 130, the conductive ground layer of the battery, and the conductive member or metal member electrically connected to the above ground layer / ground plane / metal layer. In the embodiments of the present application, the floor 201 is described by taking the ground layer of the printed circuit board 140 as an example.

[0108] Figure 4 It is a schematic exploded view of the frame 120 and the second radiator 220 provided in the embodiments of the present application. Please refer to Figure 4 , the vertical projection of the second radiator 220 on the B surface of the first reference plane is the d1 area, and the vertical projection of the conductive part of the frame 120 on the B surface of the first reference plane is the d2 area. Among them, at least part of the d1 area is located outside the d2 area.

[0109] The aforementioned vertical projection means that the projection direction is perpendicular to the B surface of the first reference plane. It can be understood that there are multiple reference planes parallel to the z direction. The B surface of the first reference plane is any one of the reference planes parallel to the z direction. In other words, at least part of the vertical projection of the second radiator 220 on the first reference plane is located outside the vertical projection of the conductive part of the frame 120 on the first reference plane, and the first reference plane is parallel to the z direction. The aforementioned first reference plane may be one of the multiple reference planes parallel to the z direction, or the aforementioned first reference plane may be any one of the multiple reference planes parallel to the z direction. It can be understood that the second radiator 220 may be a special-shaped part, and the shapes of the second radiator 220 on multiple reference planes parallel to the z direction may be different. Similarly, the frame 120 may be a special-shaped part, and the shapes of the frame 120 on multiple reference planes parallel to the z direction may be different. On the same reference plane parallel to the z direction, the projection of the second radiator 220 is located at least partly outside the projection of the frame 120.

[0110] At least part of the aforementioned d1 area is located outside the d2 area. It includes: the entire d1 area is located outside the d2 area, that is, the d1 area and the d2 area do not overlap. Or, part of the d1 area is located inside the d2 area, and part of the d1 area is located outside the d2 area. Among them, in the embodiment where the entire d1 area is located outside the d2 area, the setting of the second radiator 220 will promote the further weakening of the electric field in the area surrounded by the frame 120 of the first antenna 200, thereby reducing the loss power of the conductive material inside the frame 120 to the first antenna 200 and improving the radiation efficiency.

[0111] In an embodiment where a hole structure penetrating the frame 120 in a direction perpendicular to the z - direction is provided on the conductive part of the frame 120, the aforementioned d2 region is the region enclosed by the outer contour of the perpendicular projection of the conductive part of the frame 120 on the first reference plane B - plane.

[0112] In addition, Figure 4 if the entire frame 120 is made of a conductive material, then the perpendicular projection of the conductive part of the frame 120 on the first reference plane B - plane is the perpendicular projection of the entire frame 120 on the first reference plane B - plane. In an embodiment where only a part of the frame 120 is conductive, the perpendicular projection of the conductive part of the frame 120 on the first reference plane B - plane is located within the perpendicular projection of the entire frame 120 on the first reference plane B - plane. Since the shape of the frame 120 is not limited in the embodiments of the present application, obviously the shape of the d2 region is not limited accordingly.

[0113] Figure 4 In some embodiments, the perpendicular projection of the second radiator 220 on the second reference plane C - plane ( Figure 4 the e1 region therein) and the perpendicular projection of the conductive part of the frame 120 on the second reference plane C - plane ( Figure 4 the e2 region therein) at least partially overlap, and the second reference plane C - plane is perpendicular to the z - direction. Because the frame 120 and the second radiator 220 are spaced apart, and the perpendicular projection of the second radiator 220 on the second reference plane C - plane and the perpendicular projection of the conductive part of the frame 120 on the second reference plane C - plane at least partially overlap, at least a part of the outer contour of the second radiator 220 extends to one side of the frame 120 along the z - direction. When the wearable device is worn on the wearing part 11 of the user (as Figure 1 shown), the wearing part 11, at least a part of the outer contour of the aforementioned second radiator 220, and the conductive part of the frame 120 are stacked along the z - direction. The setting of the second radiator 220 will promote the further weakening of the electric field within the range enclosed by the frame 120 of the first antenna 200, thereby reducing the electric field in the region enclosed by the frame 120 of the first antenna 200, reducing the loss power of the conductor (such as the conductor on the printed circuit board 140) in the region enclosed by the frame 120, and improving the radiation efficiency of the first antenna 200.

[0114] Among them, the at least partial overlap of the aforementioned e1 region and e2 region includes: a part of the e1 region is within the e2 region, and the remaining part of the e1 region is outside the e2 region. Or, the entire e1 region is within the e2 region. Or, the e1 region and the e2 region coincide. It can be understood that in other embodiments, the e1 region and the e2 region may also not overlap.

[0115] The second radiator 220 includes a conductive material. For example, the conductive material may be any of the following materials: copper, aluminum, stainless steel, brass, and alloys thereof, or graphite powder, etc. Alternatively, the conductive material may be a solidified conductive paste, which includes but is not limited to silver paste or copper paste.

[0116] The embodiment of the present application does not limit the structure of the second radiator 220. In some embodiments, the second radiator 220 may include a conductive film, including but not limited to a chemically plated film, an electroplated film, a coating, etc. In the embodiment where the second radiator 220 includes a conductive film, the second radiator 220 may also include a support plate for supporting the conductive film, and the support plate may be, for example, plastic, ceramic, or glass. Alternatively, the conductive film may be connected to a component located on the side of the frame 120 facing the rear shell 130, such as the rear shell 130 or the rear shell decorative component.

[0117] In other embodiments, the second radiator 220 may be a conductive plate or a conductive strip, and the conductive plate or the conductive strip may be independent of other components, for example, the aforementioned support plate is not provided.

[0118] Please return to Figure 2b In some embodiments, the second radiator 220 is attached to the rear shell 130. For example, the second radiator 220 is attached to the surface of the rear shell 130 facing the frame 120. In this way, the rear shell 130 supports the second radiator 220. In the embodiment where the second radiator 220 is a conductive film, the second radiator 220 is attached to the surface of the rear shell 130 facing the frame 120. The arrangement of the second radiator 220 has little effect on the volume of the entire wearable device 100, and the integration of the wearable device 100 is relatively high. In addition, the arrangement of the second radiator 220 does not affect the appearance of the wearable device 100.

[0119] Alternatively, in some other embodiments, the second radiator 220 is in contact with the surface of the rear housing 130 facing away from the frame 120. Figure 3 The second radiator 220 significantly weakens the electric field in the area surrounded by the frame 120, which is beneficial to improving the radiation efficiency of the first antenna 200. In addition, the second radiator 220 can be set on the surface of the rear shell 130 away from the frame 120, and the second radiator 220 can be set to a shape that decorates the appearance of the wearable device 100, so that the second radiator 220 has both decorative properties.

[0120] The embodiments of the present application do not limit the connection method of the second radiator 220 attached to the rear shell 130. For example, the second radiator 220 can be attached to the rear shell 130 by chemical coating or electroplating. Or, the second radiator 220 can be attached to the rear shell 130 in the form of cured conductive paste. Or, the second radiator 220 can be attached to the rear shell 130 through an adhesive layer or a solder layer.

[0121] In other embodiments, the second radiator 220 can also be embedded in the rear shell 130, and the second radiator 220 is invisible without cutting open the rear shell 130. Or, the second radiator 220 is arranged at an interval from the rear shell 130.

[0122] As described above, the second radiator 220 is electrically connected to the first radiator 210 or the floor 201. In other words, in some embodiments, the second radiator 220 is electrically connected to the first radiator 210.

[0123] Figure 5 It is a schematic structural diagram of the frame 120 and the second radiator 220 provided by the embodiments of the present application. Figure 5 In the figure, the wearable device 100 further includes a first electrical connector 203. One end of the first electrical connector 203 is electrically connected to the second radiator 220. The first radiator 210 is electrically connected, and the other end of the first electrical connector 203 is electrically connected to the first radiator 210 or the floor 201.

[0124] In this way, through the arrangement of the first electrical connector 203, the second radiator 220 can be electrically connected to the first radiator 210 or the floor 201 of the wearable device 100.

[0125] In addition, if the second radiator 220 and the first radiator 210 transmit signals through coupling, a larger coupling area between the second radiator 220 and the first radiator 210 is required for coupling. A smaller coupling may result in an open circuit between the second radiator 220 and the first radiator 210. In addition, the presence of other structures (such as the printed circuit board 140) in the wearable device 100 may also reduce the coupling area, resulting in an open circuit between the second radiator 220 and the first radiator 210. The second radiator 220 is directly electrically connected to the first radiator 210 through the first electrical connector 203, which can better ensure the electrical connection performance between the second radiator 220 and the first radiator 210. The electrical coupling amount between the second radiator 220 and the first radiator 210 reaches within the target electrical coupling amount range and is not easily affected by other structures in the wearable device 100.

[0126] The embodiments of the present application do not limit the structure of the first electrical connector 203. For example, the first electrical connector 203 can be a conductive adhesive layer, a conductive foam, a solder layer, a conductive elastic piece, a conductive screw connector, a conductive snap connector, etc. It can be understood that the connection manner between the first electrical connector 203 and the first radiator 210 or the second radiator 220 can be set according to the structure of the first electrical connector 203, and the embodiments of the present application do not limit this.

[0127] In some embodiments, along any direction perpendicular to the z direction, the size of the first electrical connector 203 is less than or equal to 5 mm. There are multiple directions perpendicular to the z direction. For example, Figure 5 the f1 direction, the f2 direction, and the f3 direction in [description] are all perpendicular to the z direction, etc. The sizes of the first electrical connector 203 along the f1 direction, the f2 direction, and the f3 direction are all less than or equal to 5 mm. In other words, along the direction perpendicular to the z direction, the maximum size of the first electrical connector 203 is d, and d is less than or equal to 5 mm. For example, along the direction perpendicular to the z direction, the maximum size of the first electrical connector 203 is 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, etc. In this way, the presence of the first electrical connector 203 can electrically connect the first radiator 210 and the second radiator 220. At the same time, the setting of the first electrical connector 203 with a smaller size can avoid forming an open circuit at the connection position between the first electrical connector 203 and the first radiator 210. In other words, the current between the first radiator 210 and the second radiator 220 can be electrically conducted through the first electrical connector 203 with a smaller size. The second radiator 220 has the function of dispersing the current flowing from the first antenna 200 to the first radiator 210, thereby weakening the electric field strength in the internal area surrounded by the frame 120 and improving the radiation efficiency of the first antenna 200.

[0128] It can be understood that in some embodiments, the first electrical connector 203 can include multiple conductive bodies, and the maximum size d of the aforementioned first electrical connector 203 is the sum of the sizes of the multiple conductive bodies. For example, in the embodiment where the first electrical connector 203 is a solder layer, the first electrical connector 203 includes multiple solder joints, and there can be a gap between adjacent solder joints. Along any direction perpendicular to the z direction, the sum of the sizes of the multiple solder layers is less than or equal to 5 mm.

[0129] The embodiment of the present application does not limit the number of the first electrical connectors 203. For example, the first electrical connectors 203 can be one, two, three or more. In the embodiments where there are multiple first electrical connectors 203, the distance between two adjacent first electrical connectors 203 is greater than or equal to 5 mm. For example, the distance between two adjacent first electrical connectors 203 is 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 15 mm, etc. Assuming that the distance between two adjacent first electrical connectors 203 is relatively close (e.g., less than 5 mm), the two adjacent first electrical connectors 203 can be equivalent to one first electrical connector 203. The current on the first radiator 210 is shunted by the aforementioned equivalent first electrical connector 203. The effect of the second radiator 220 on shunting the current on the first radiator 210 is reduced, and the ability of the second radiator 220 to reduce the electric field intensity in the internal area surrounded by the frame 120 is correspondingly weakened, and the second radiator 220 has limited effect on improving the radiation efficiency of the first antenna 200. On the contrary, when the distance between two adjacent first electrical connectors 203 is relatively far (e.g., greater than or equal to 5 mm), each first electrical connector 203 can disperse the current on the first radiator 210, the ability of the second radiator 220 to reduce the electric field intensity in the internal area surrounded by the frame 120 is stronger, and the effect of the second radiator 220 on improving the radiation efficiency of the first antenna 200 is obvious.

[0130] In the embodiments where the number of the first electrical connectors 203 is multiple, one end of a part of the first electrical connectors 203 away from the second radiator 220 is electrically connected to the floor 201, and one end of the remaining first electrical connectors 203 away from the second radiator 220 is electrically connected to the first radiator 210.

[0131] Please return to Figure 2b , in some embodiments, the wearable device 100 further includes a charging coil 170, and the charging coil 170 is located between the rear case 130 and the printed circuit board 140. Both opposite ends of the charging coil 170 are electrically connected to the battery. In one embodiment, the charging coil 170 and the second radiator 220 are electrically isolated. In other words, the charging coil 170 and the second radiator 220 are not electrically connected to each other, so that electrical signals or currents cannot be transmitted between the charging coil 170 and the second radiator 220.

[0132] In some embodiments, the wearable device 100 further includes an NFC coil (not shown in the figure), and the NFC coil can be located between the printed circuit board and the display screen. Both opposite ends of the NFC coil 170 are connected to the NFC chip. In one embodiment, the NFC coil and the second radiator 220 are electrically isolated.

[0133] The charging coil 170 (or NFC coil) can be an annular winding made of tightly wound wires. The charging coil 170 (or NFC coil) includes a plurality of wire loops connected in series. There is an insulating medium between two adjacent conductive loops in the charging coil 170 (or NFC coil). In other words, along the radial direction of the charging coil 170 (or NFC coil), the charging coil 170 (or NFC coil) can be regarded as multiple discontinuous wire loops, with an insulating medium between two adjacent wire loops, and two adjacent wire loops are connected in series. Exemplarily, the wire thickness of a wire loop in the charging coil 170 (or NFC coil) can be 0.1 mm - 0.3 mm. For example, the diameter of a wire loop in the charging coil 170 (or NFC coil) can be 0.1 mm, 0.11 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.28 mm or 0.3 mm, etc.

[0134] Exemplarily, the charging coil 170 is electrically connected to the power management chip. For example, the power management chip includes an input voltage detection module, an output voltage regulation module, an overvoltage protection module, an undervoltage protection module, an overcurrent protection module, etc.

[0135] Exemplarily, one side of the charging coil 170 (or NFC coil) is disposed close to the magnetic conductor. Among them, the magnetic conductor can include materials such as ferrite and nanocrystalline, so that the charging coil 170 (or NFC coil) generates its working magnetic field.

[0136] The embodiment of the present application does not limit the positional relationship between the second radiator 220 and the charging coil 170. In some embodiments, the charging coil 170 is closer to the rear case 130 than the second radiator 220. In other embodiments, the second radiator 220 is closer to the rear case 130 than the charging coil 170. Or, in still other embodiments, the projections of the charging coil 170 and the second radiator 220 on a reference plane parallel to the z direction overlap.

[0137] The embodiment of the present application does not limit the shape of the second radiator 220. In some embodiments of the present application, the second radiator 220 is an open-loop structure or a closed-loop structure. Among them, the open-loop structure can be regarded as a bent bar-shaped structure, and the head end of the bar-shaped structure is close to the tail end but not connected. The embodiment of the present application does not limit the shape of the open-loop structure or the closed-loop structure, for example, it is a circular ring shape, a rectangular ring shape or other irregular ring shapes. Figure 5 In it, the second radiator 220 is an elliptical ring structure.

[0138] In an embodiment where the second radiator 220 is an open-loop structure or a closed-loop structure, the maximum width of the loop structure is greater than or equal to 0.5 mm and less than or equal to 50 mm. For example, the aforementioned maximum width may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2 mm, 5 mm, 10 mm, 13 mm, 15 mm, 18 mm, 20 mm, 25 mm, 30 mm, 35 mm, 39 mm, 46 mm, 50 mm, etc. In other words, the loop structure may be an irregular shape, and the width of the loop structure is not uniform, and the dimension at the maximum width is greater than or equal to 0.5 mm. Taking the loop structure as a circular ring as an example, the difference between the inner diameter and the outer diameter of the circular ring is greater than or equal to 0.5 mm. The width of the loop structure is relatively wide, and the ability of the second radiator 220 to reduce the electric field strength in the internal area surrounded by the frame 120 is relatively strong, and the effect of the second radiator 220 on improving the radiation efficiency of the first antenna 200 is obvious. It can be understood that in an embodiment where the width of the loop structure is relatively wide (for example, 30 mm - 50 mm), the loop structure can be regarded as a sheet structure.

[0139] In some embodiments, in an embodiment where the second radiator 220 is an open-loop structure or a closed-loop structure, the distance from any point on the second radiator 220 to the geometric center of the rear shell 130 is greater than or equal to 10 mm. Obviously, the maximum distance from the second radiator 220 to the geometric center of the rear shell 130 is greater than or equal to 10 mm. In some embodiments, the distance from the outer edge of the second radiator 220 to the geometric center of the rear shell 130 is greater than the distance from the outer edge of the charging coil 170 to the geometric center of the rear shell 130. In other words, the projection of the edge of the second radiator 220 on the second reference plane C plane (as Figure 4 shown) is located outside the projection of the edge of the charging coil 170 on the second reference plane C plane.

[0140] In some embodiments, a part of the charging coil 170 can be used as a part of the second radiator 220. For example, Figure 6 the inner ring structures in FIGS. (c), (g), and (h) can be part of the charging coil 170 or the entire charging coil 170. In other words, any part of the wires in the second radiator 220 and the charging coil 170 are electrically connected. For example, the second radiator 220 and the charging coil 170 are electrically connected through a capacitor, so that the charging coil 170 acts as part of the second radiator 220. The aforementioned capacitor is greater than or equal to 10 picofarads (pF) and less than or equal to 100 picofarads (pF).

[0141] In an embodiment where the second radiator 220 has an open-loop structure, at least one of the head end and the tail end of the open-loop structure is a free end. For example, if the head end of the open-loop structure is a free end, then the head end is not electrically connected to other conductive structures. For example, the aforementioned first electrical connector 203 is not electrically connected to the head end. Alternatively, if the tail end of the open-loop structure is a free end, then the tail end is not electrically connected to other conductive structures. For example, the aforementioned first electrical connector 203 is not electrically connected to the tail end.

[0142] In some other embodiments of the present application, the second radiator 220 has a strip-shaped structure, and at least one of the two opposite ends of the strip-shaped structure is a free end. The aforementioned free end means that the end of the strip-shaped structure is not electrically connected to other conductive structures. For example, the aforementioned first electrical connector 203 is not electrically connected to the end of the strip-shaped structure.

[0143] In an embodiment where the second radiator 220 has a strip-shaped structure, the maximum width of the strip-shaped structure is greater than or equal to 0.5 mm. The extension path of the strip-shaped structure can be a straight line, a broken line, a curve, or a combination thereof. Similarly, a relatively large maximum width of the strip-shaped structure is beneficial to increasing the degree of decrease in the electric field strength in the internal area surrounded by the frame 120, reducing the loss of the internal area surrounded by the frame 120 to the first antenna 200, and improving the radiation efficiency of the first antenna 200.

[0144] In some embodiments of the present application, the second radiator 220 is further provided with through holes that penetrate the second radiator 220. The through holes can avoid other components in the wearable device 100. For example, they can avoid components on the printed circuit board 140. The present application embodiments do not limit the shape of the through holes. For example, the through holes can be round holes, square holes, or strip-shaped holes. The present application embodiments do not limit the number of through holes. In some embodiments, the second radiator 220 is provided with a plurality of through holes, and the shape and size of the plurality of through holes can be the same or different. The second radiator 220 including a plurality of through holes can be regarded as a mesh structure. Exemplarily, in any direction perpendicular to the z direction, the size of the through hole is smaller than the width of the second radiator 220. The present application embodiments do not limit the diameter of the through hole. Exemplarily, the diameter of the through hole can be 0.1 mm to 0.5 mm. For example, the diameter of the through hole can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, etc.

[0145] Figure 6 Schematic diagrams of various shapes of the second radiator 220 provided by the embodiments of the present application. Figure 6 In the middle is the projected shape of the second radiator 220 in a direction perpendicular to the z direction (as Figure 5 shown). Figure 6 In FIG. (a), the second radiator 220 has an open-loop structure. Figure 6 In FIG. (b), the second radiator 220 is a circular plate.Figure 6 In FIG. (c), the second radiator 220 includes an inner ring structure and an outer ring structure, and the outer ring structure is sleeved on the inner ring structure. The inner ring structure is a closed-loop structure, and the outer ring structure includes two open-loop structures arranged at intervals. Figure 6 In FIG. (d), the second radiator 220 includes two open-loop structures arranged at intervals, and through holes are provided on both open-loop structures. Figure 6 In FIG. (e), the second radiator 220 is a strip structure, and the extending path of the strip structure is an irregular shape. Figure 6 In FIG. (f), the second radiator 220 is a square open-loop structure. Figure 6 In FIG. (g), the second radiator 220 includes a closed-loop structure and an open-loop structure. The open-loop structure is looped around the outer periphery of the closed-loop structure, and the open-loop structure and the closed-loop structure are electrically connected. Figure 6 In FIG. (h), the second radiator 220 includes two open-loop structures. One open-loop structure is looped around the outer periphery of the other open-loop structure, and the two open-loop structures are electrically connected. It can be understood that Figure 6 only some shapes of the second radiator 220 are exemplified herein. In other embodiments, the second radiator 220 may also be of other shapes.

[0146] Figure 7 is a structural schematic diagram of the antenna structure provided by the embodiment of the present application. Please refer to Figure 7 , the first conductive part of the frame 120 serves as the first radiator 210 of the first antenna 200. A first grounding point 211 and a first feeding part 230 are provided on the first radiator 210. The frame 120 is grounded at the first grounding point 211 and is electrically connected to the floor 201 (as Figure 5 shown). The first feeding part 230 is used to feed an electrical signal into the first antenna 200. Figure 7 In, the entire frame 120 is the first radiator 210.

[0147] In some embodiments, two grounding points are provided on the first radiator 210, namely the first grounding point 211 and the second grounding point 212. The first radiator 210 is grounded at the first grounding point 211 and the second grounding point 212 and is electrically connected to the floor 201 (as Figure 5 shown). Alternatively, in other embodiments, more grounding points may be provided.

[0148] As described above, the second radiator 220 is electrically connected to the floor 201 or the first radiator 210. Exemplarily, the second radiator 220 is provided with a first electrical connection point 221. In some embodiments, the first electrical connection point 221 is electrically connected to the first radiator 210. For example, the first electrical connection point 221 is connected to the first radiator 210 through a first electrical connector 203 (as Figure 5shown) is electrically connected to the first radiator 210. Alternatively, in some other embodiments, the first electrical connection point 221 is electrically connected to the floor 201 (as Figure 5 shown). For example, the first electrical connection point 221 is electrically connected to the floor 201 through the first electrical connector 203.

[0149] In some embodiments, the second radiator 220 is directly electrically connected near the current maximum point in the operating mode of the first radiator 210. The area near the current maximum point in the operating mode of the first radiator 210 can be considered as: based on the operating frequency band of the wearable device 100, within 30 mm or within 10 mm from the current maximum point in the operating mode of the first radiator 210. The current maximum point can be the grounding point of the first radiator 210 or the geometric center area of the first radiator 210.

[0150] In some embodiments, the radiator length between the electrical connection point of the first radiator 210 and the second radiator 220 and the grounding point of the first radiator 210 is less than or equal to 30 mm, or less than or equal to 10 mm. In embodiments where the first radiator 210 has multiple grounding points, the radiator length between the aforementioned electrical connection point and one of the grounding points is less than or equal to 30 mm. Alternatively, the radiator length between the aforementioned electrical connection point and each grounding point is less than or equal to 30 mm. The radiator length between the aforementioned electrical connection point and one of the grounding points refers to the minimum length on the radiator between the two points.

[0151] In some embodiments, the radiator length between the electrical connection point of the first radiator 210 and the second radiator 220 and the geometric center point of the first radiator 210 is less than or equal to 30 mm, or less than or equal to 10 mm.

[0152] In embodiments where the first radiator 210 and the second radiator 220 are electrically connected through the first electrical connector 203, the aforementioned electrical connection point is the connection point between the first electrical connector 203 and the first radiator 210. In embodiments where there are multiple first electrical connectors 203, the radiator length between the connection point of at least one first electrical connector 203 and the first radiator 210 and the grounding point of the first radiator 210 is less than or equal to 30 mm. Figure 7 The case where it is less than or equal to 30 mm between the connection point K and the second grounding point 212 is described as an example.

[0153] In some embodiments, the connection point K of the second radiator 220 is electrically connected to the first radiator 210, and the distance between the connection point K and one of the grounding points of the first radiator 210 (such as the second grounding point 212) is less than or equal to 30 mm. For example, the distance between the connection point K and the second grounding point 212 is 0 mm, 2 mm, 5 mm, 8 mm, 10 mm, 13 mm, 16 mm, 20 mm, 23 mm, 26 mm, or 30 mm, etc. Generally, the large current points generated by the first antenna 200 in the operating frequency band are within the region where the distance between the grounding points of the first radiator 210 is less than or equal to 30 mm. In some embodiments, the radiator length between the connection point K and one of the grounding points of the first radiator 210 (such as the second grounding point 212) is less than or equal to 10 mm. The connection point K of the second radiator 220 and the first radiator 210 is located at or near the aforementioned large current point. The current shunted from the first radiator 210 to the second radiator 220 is relatively large, which can enhance the effect of the second radiator 220 in dispersing the current on the first radiator 210. The degree of decrease in the electric field intensity in the internal region surrounded by the frame 120 is increased, and the radiation efficiency of the first antenna 200 is improved.

[0154] In the embodiment where the second radiator 220 is connected to the first radiator 210 through the first electrical connector 203, the first electrical connector 203 is electrically connected to the K point.

[0155] It can be understood that other structures of the wearable device 100 (such as the aforementioned printed circuit board 140 or button 14, etc.) may need to be avoided in the region near the aforementioned large current point, and the region near the aforementioned large current point may not be suitable for arranging the structure (such as the aforementioned first electrical connector 203) for electrically connecting the second radiator 220 and the first radiator 210. The second radiator 220 can be connected to a position near the non-large current point of the first radiator 210, and the second radiator 220 can also disperse the current on the first radiator 210, improving the radiation efficiency of the first antenna 200.

[0156] In some embodiments of the present application, the wearable device 100 may be a multi-antenna structure. For example, the wearable device 100 may further include a second antenna.

[0157] Please return to Figure 5 , the second antenna 300 includes a third radiator 310 and a second feeding portion 320. The frame 120 includes a second conductive portion, and the second conductive portion serves as the third radiator 310. The second feeding portion 320 is used to feed the third radiator 310. In this way, the wearable device is a multi-antenna structure.

[0158] The embodiments of the present application do not limit the operating frequency band of the second antenna 300. Exemplarily, the operating frequency band of the second antenna 300 is in the range of 0.6 GHz - 1.2 GHz. The second antenna 300 can be used as a GNSS antenna (L1 band or L5 band), a BT antenna, a Cell antenna, a WiFi antenna, etc.

[0159] The embodiments of the present application do not limit the positions of the second feeding part 320 and the first feeding part 230 in the frame 120. For example, taking the geometric center of the frame 120 as the center of a circle, the feeding point of the second feeding part 320 is set at the 4 o'clock position of the frame 120, and the first feeding part 230 is set at the 7 o'clock position of the frame 120. The positions at the 3 o'clock, 8 o'clock, 10 o'clock, and 11 o'clock directions of the frame 120 serve as the grounding points of the antenna.

[0160] In some embodiments, the second antenna 300 further includes a fourth radiator 330. The fourth radiator 330 is electrically connected to the third radiator 310 or the floor 201. The frame 120 is spaced apart from the fourth radiator 330, and the fourth radiator 330 is located on the side of the frame 120 facing the rear case 130. There is a second gap between the second conductive part and the fourth radiator 330. At least part of the vertical projection of the fourth radiator 330 on the first reference plane is located outside the vertical projection of the conductive part of the frame 120 on the first reference plane. Thus, the fourth radiator 330 and the third radiator 310 can be regarded as the radiators of the second antenna 300 together. The fourth radiator 330 can weaken the electric field in the area surrounded by the frame 120, reduce the power of the conductor loss in the area surrounded by the frame 120 of the second antenna 300, and improve the radiation efficiency of the second antenna 300.

[0161] For the structure of the fourth radiator 330, please refer to the structure description of the aforementioned second radiator 220. For the positional relationship and connection relationship between the fourth radiator 330 and the frame 120, please refer to the relevant description of the aforementioned second radiator 220 and the frame 120, which will not be elaborated here.

[0162] The embodiments of the present application do not limit the connection relationship between the first conductive part of the frame 120 and the second conductive part of the frame 120. In some embodiments, the first conductive part and the second conductive part are electrically connected. For example, in an embodiment where the entire frame 120 is a conductive structure, the first conductive part and the second conductive part of the frame 120 are electrically connected as a whole. The entire frame 120 can be regarded as either the first conductive part (the first radiator 210) or the second conductive part (the second radiator 220). In other embodiments, the first conductive part and the second conductive part are not electrically connected. For example, the frame 120 further includes a non-conductive part, and the first conductive part and the second conductive part are connected through the non-conductive part.

[0163] As Figure 7 shown, the fourth radiator 330 and the second radiator 220 are electrically connected. For example, the fourth radiator 330 and the second radiator 220 are integrally formed as one piece. In other words, the fourth radiator 330 and the second radiator 220 can be regarded as a conductor. Thus, Figure 7 in the example of, the entire frame 120 is a conductive structure. Since the fourth radiator 330 and the second radiator 220 can be regarded as a conductor, the second radiator 220 can be connected through a first electrical connector 203 (such as Figure 5 shown), so as to realize the electrical connection between the first radiator 210 and the second radiator 220, and the electrical connection between the fourth radiator 330 and the third radiator 310.

[0164] In an embodiment where the fourth radiator 330 and the second radiator 220 are integrally formed as one piece, the second antenna 300 further includes a second electrical connector 301. The opposite ends of the second electrical connector 301 are electrically connected to the third radiator 310 and the fourth radiator 330 respectively.

[0165] The embodiment of the present application does not limit the structure of the second electrical connector 301. Please refer to the description of the foregoing first electrical connector 203, which will not be elaborated here.

[0166] In some other embodiments, the fourth radiator 330 and the second radiator 220 are not electrically connected. For example, the fourth radiator 330 and the second radiator 220 are arranged at intervals.

[0167] Figure 8 FIG. is a schematic structural diagram of another second antenna 300 and a first antenna 200 provided by an embodiment of the present application. Figure 8 In, the frame 120 includes a non-conductive part 123, a first conductive part (i.e., the first radiator 210) and a second conductive part (i.e., the third radiator 310). The non-conductive part 123 is located between the third radiator 310 and the first radiator 210.

[0168] Figure 8 In the example of, the frame 120 includes two non-conductive parts 123. The two non-conductive parts 123 divide the frame 120 into the third radiator 310 and the first radiator 210 that are not electrically connected. In other embodiments, the third radiator 310 and the first radiator 210 are integrally formed as one piece. The end of the third radiator 310 far from the first radiator 210 and the end of the first radiator 210 far from the third radiator 310 are respectively connected to the opposite ends of the non-conductive part 123.

[0169] Figure 8In the example, the fourth radiator 330 and the second radiator 220 are spaced apart. The fourth radiator 330 and the third radiator 310 are electrically connected. The second radiator 220 and the first radiator 210 are electrically connected. Similarly, in Figure 8 the example, the second radiator 220 and the fourth radiator 330 are beneficial to improving the radiation efficiency of the first antenna 200 and the second antenna 300.

[0170] The embodiment of the present application does not limit the material of the non-conductive part 123. For example, the material of the non-conductive part 123 is a non-conductive material, and the non-conductive material may include plastics, glass, rubber or ceramics.

[0171] Figure 8 In, the fourth radiator 330 and the second radiator 220 are not electrically connected. In other embodiments, the fourth radiator 330 and the second radiator 220 may be electrically connected, for example, connected as an integrally formed part.

[0172] In some embodiments of the present application, the rear shell 130 may also be made of a metal material.

[0173] Figure 9 is a schematic structural diagram of another frame 120 and rear shell 130 provided by the embodiment of the present application. For the structure of the frame 120, please refer to Figure 2b the description in. Figure 9 In, the rear shell 130 is a conductive material, for example, the rear shell 130 is a metal shell. An annular gap 131 is provided on the rear shell 130, and the annular gap 131 penetrates the rear shell 130 along the z direction. Similarly, the annular gap 131 provided on the rear shell 130 can also weaken the electric field of the first antenna 200 in the area surrounded by the frame 120, reduce the energy loss in the area surrounded by the frame 120, and improve the radiation efficiency of the first antenna 200. In Figure 9 the embodiment, the first antenna 200 may not be provided with the aforementioned second radiator.

[0174] Similarly, in some embodiments, Figure 9 the aforementioned second antenna 300 may also be provided on the frame 120 of, and the annular gap 131 can improve the radiation efficiency of the second antenna 300. The second antenna 300 may also not be provided with the aforementioned fourth radiator.

[0175] Exemplarily, the shape of the annular gap 131 may be a circular ring, a square ring or an irregular closed-loop shape. In some embodiments, in order to improve the waterproofness of the rear shell 130, the annular gap 131 may be filled with a non-conductive material, and the non-conductive material may include plastics, glass, rubber or ceramics, etc.

[0176] Figure 10 is the radiation efficiency curve graph of the first antenna 200 in the aforementioned Figure 2b . Figure 10Among them, the curve u1 is the Figure 2b radiation efficiency curve of the first antenna 200 in Figure 2b . The curve u2 is the radiation efficiency curve of the antenna in the comparative example. Among them, the difference between the antenna in the comparative example and the Figure 10 first antenna 200 in

[0177] is only that the aforementioned second radiator 220 is not provided in the comparative example. It can be seen from

[0178] Table 1

[0179] Unit: megawatt Input energy Radiation energy Conductor loss Dielectric loss Free space 480 3 370 85 Wearing state 480 18 276 170

[0180] In Table 1, the input energy refers to the total energy input at the antenna port in the comparative example, the conductor loss refers to the loss of the conductor inside the wearable device, and the dielectric loss refers to the loss outside the wearable device. It can be seen from Table 1 that when the wearable device in the comparative example is in the worn state, the conductor loss decreases and the dielectric loss increases, and the increase in the dielectric loss is less than the decrease in the conductor loss. It shows that increasing the dielectric loss and reducing the conductor loss is beneficial to improving the radiation efficiency of the antenna.

[0181] Figure 11a is the radiation efficiency curve diagram of the first antenna in the aforementioned Figure 5 . Among them, Figure 11a the first antenna shown in Figure 11b is the GNSS antenna (L1 band) and the Cell (cellular) antenna. Figure 5 is the radiation efficiency curve diagram of the second antenna in the aforementioned Figure 11b . Among them, Figure 11a and Figure 11b it can be seen that Figure 5 the radiation efficiency of the first antenna and the second antenna provided in

[0182] Figure 12 is the isolation curve diagram of the first antenna and the second antenna in the aforementioned Figure 5 . Figure 12 In Figure 12 , the first antenna is the GNSS antenna (L1 band) and the Cell (cellular) antenna. The second antenna is the GNSS antenna (L5 band) and the BT antenna. Figure 12It can be seen that the isolation in the LB band is -8 dB, the isolation in the L1 band is -10 dB, and the isolation in the remaining bands is greater than -15 dB.

[0183] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the said claims.

Claims

1. A wearable device, characterized in that, The wearable device comprises: Display screen; Back shell; floor; A frame, the frame is circumferentially connected between the rear housing and the display screen; the frame includes a first conductive portion; and A first antenna, the first antenna comprising a first radiator, a second radiator and a first feeder, the first conductive portion serving as the first radiator; the first feeder being used to feed the first radiator or the second radiator; the second radiator being electrically connected to the first radiator or the floor, wherein the maximum width of the second radiator is greater than or equal to 0.5 mm; The frame and the second radiator are arranged at an interval, the second radiator is located on the side of the frame facing the rear shell in the thickness direction of the display screen, a first gap is provided between the first conductive part and the second radiator, at least part of the vertical projection of the second radiator on the first reference plane is located outside the vertical projection of the conductive part of the frame on the first reference plane, and the first reference plane is parallel to the thickness direction of the display screen.

2. The wearable device according to claim 1, characterized in that, A vertical projection of the second radiator on the first reference plane and a vertical projection of the conductive portion of the frame on the first surface do not intersect.

3. The wearable device according to claim 1 or 2, characterized in that, The second radiator is in contact with a surface of the rear shell facing the frame; or, the second radiator is in contact with a surface of the rear shell facing away from the frame; or, the second radiator is buried in the rear shell.

4. The wearable device according to any one of claims 1 - 3, characterized in that, The second radiator is electrically connected to a connection point of the first radiator, and a radiator length between the connection point and at least one grounding point of the first radiator is less than or equal to 30 mm.

5. The wearable device according to any one of claims 1 - 4, characterized in that, The first antenna further comprises a first electrical connector, wherein opposite ends of the first electrical connector are electrically connected to the first radiator and the second radiator respectively; Alternatively, two opposite ends of the first electrical connector are electrically connected to the floor and the second radiator, respectively.

6. The wearable device according to claim 5, characterized in that, Along any direction perpendicular to the thickness direction of the display screen, the size of the first electrical connection member is less than or equal to 5 mm.

7. The wearable device according to claim 5 or 6, characterized in that, The first antenna includes a plurality of the first electrical connectors, the plurality of the first electrical connectors are arranged at intervals, and a distance between two adjacent first electrical connectors is greater than or equal to 5 mm.

8. The wearable device according to any one of claims 1 - 7, characterized in that, The second radiator is a conductive coating.

9. The wearable device according to any one of claims 1 - 8, characterized in that, The second radiator is a closed loop structure; Alternatively, the second radiator is an open-loop structure.

10. The wearable device according to any one of claims 1 - 8, characterized in that, The second radiator is a strip-shaped structure, and at least one of two opposite ends of the strip-shaped structure is a free end.

11. The wearable device according to any one of claims 1 - 10, characterized in that, The second radiator is provided with a plurality of through holes.

12. The wearable device according to any one of claims 1 - 11, characterized in that, A vertical projection of the second radiator on a second reference plane at least partially overlaps with a vertical projection of the conductive portion of the frame on the second reference plane, and the second reference plane is perpendicular to a thickness direction of the display screen.

13. The wearable device according to any one of claims 1 - 12, characterized in that, The wearable device further comprises: The second antenna includes a third radiator and a second feeding portion, the frame includes a second conductive portion, the second conductive portion serves as the third radiator, and the second feeding portion is used to feed the third radiator.

14. The wearable device according to claim 13, characterized in that, The second antenna further includes a second electrical connector, and opposite ends of the second electrical connector are electrically connected to the third radiator and the second radiator respectively.

15. The wearable device according to claim 13, wherein, The second antenna further includes a fourth radiator, and the fourth radiator is electrically connected to the third radiator or the ground of the wearable device; The frame is disposed at an interval from the fourth radiator. The fourth radiator is located on a side of the frame facing the rear case in the thickness direction of the display screen. There is a second gap between the second conductive portion and the fourth radiator. At least a part of the vertical projection of the fourth radiator on the first reference plane is located outside the vertical projection of the conductive portion of the frame on the first reference plane.

16. The wearable device according to any one of claims 1-15, wherein, The size of the first gap in the thickness direction of the display screen is greater than or equal to 0.5 mm and less than or equal to 15 mm.

17. The wearable device according to any one of claims 1-16, wherein, The wearable electronic device further includes: a charging coil, and the charging coil is connected to a side of the rear case facing the frame; the second radiator is electrically isolated from the charging coil.

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