Wearable device

Abstract

The embodiment of the invention provides wearable equipment. The wearable equipment comprises a radiator, a PCB (Printed Circuit Board) and an FPC (Flexible Printed Circuit), the radiator and the PCB are located at the ear handle part of the wearable device, the FPC part can be located at the ear handle part of the wearable device, and the FPC part can be located at the ear muff part of the wearable device. The first end of the radiator can be coupled with the PCB 220. The FPC comprises a grounding layer, a first end of the grounding layer is electrically connected with the PCB, and a second end of the grounding layer is located at an ear muff part of the wearable device. And the grounding layer of the FPC in the ear muff part is provided with a gap, so that the wearable equipment has good communication quality in a working frequency band.

Description

Technical Field

[0001] The present application relates to the field of wireless communications, and in particular to a wearable device. Background Art

[0002] Wireless earphones are becoming more and more popular among users due to their convenience and miniaturization, especially true wireless stereo (TWS) and bluetooth (BT) earphones.

[0003] In wireless headphones, the PCB located in the ear handle needs to be electrically connected to the electronic devices (e.g., speakers, pickups, etc.) set in the ear bag through the FPC. When the radiator in the wireless headset resonates, the FPC extends the path of the current, causing the radiator to produce two resonances through two different working modes. A pit of radiation efficiency will be generated between the resonance points of the two resonances, which will affect the communication quality of the wireless headset and reduce the user experience. Summary of the invention

[0004] An embodiment of the present application provides a wearable device, which can provide good communication quality within a working frequency band by opening a gap in the ground layer of an FPC located in an ear bag portion.

[0005] In a first aspect, a wearable device is provided, wherein the wearable device comprises an ear bag portion and an ear handle portion, wherein the first end of the ear handle portion is connected to the ear bag portion, and the wearable device further comprises: a radiator, wherein the radiator is located in the ear handle portion; a printed circuit board PCB, wherein the PCB is located in the ear handle portion, and the radiator is coupled to the PCB; and a flexible circuit board FPC, wherein the FPC comprises a grounding layer, wherein the first end of the grounding layer is coupled to the PCB, the second end of the grounding layer is located in the ear bag portion, and the second end of the grounding layer comprises a groove, wherein the distance between the closed end of the groove and the end of the second end of the grounding layer is smaller than the distance between the open end of the groove and the end of the second end of the grounding layer.

[0006] According to the technical solution of the embodiment of the present application, the radiator is used to generate a first resonance and a second resonance. When the radiator resonates, the current on the first part flows from the open end of the slot to the closed end, and the current on the second part is opposite to the current on the first part, flowing from the closed end of the slot to the open end. Therefore, the second part can extend the current path when the radiator resonates. This part has little effect on the resonance point frequency of the second resonance. However, for the first resonance, since the electrical length of the second part is equivalent to extending the current path during the first resonance, the resonance point frequency of the first resonance is shifted to a low frequency, so that a pit of radiation efficiency is generated between the resonance point frequency of the first resonance and the resonance point frequency of the second resonance, which is located outside the working frequency band and will not affect the communication quality of the wearable device.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the ground layer is divided into a first part and a second part by the groove, the width of the first part is greater than the width of the second part, and the width of the second part is greater than or equal to 0.1 mm.

[0008] According to the technical solution of the embodiment of the present application, the width of the second portion is greater than or equal to 0.1 mm, so that the current on the second portion has a good transmission path.

[0009] In combination with the first aspect, in some implementations of the first aspect, the ground layer is divided into a first part and a second part by the groove, and a ratio of a width of the first part to a width of the second part is greater than 1.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the ground layer is divided into a first part and a second part by the groove, and a ratio of a width of the first part to a width of the second part is greater than or equal to 4.

[0011] According to the technical solution of the embodiment of the present application, when the groove can be located at the edge of the second end of the ground layer, the width of the first part is wider and can be used as a complete floor. A signal line can be set above the first part, which is beneficial to improving the utilization rate of the ground layer.

[0012] In combination with the first aspect, in some implementations of the first aspect, the ground layer is divided into a first part and a second part by the groove; when the radiator resonates, the currents in the first part and the second part flow in opposite directions.

[0013] In combination with the first aspect, in some implementations of the first aspect, a width of the groove is greater than or equal to 0.1 mm.

[0014] In combination with the first aspect, in some implementations of the first aspect, a width of the groove is greater than or equal to 0.5 mm.

[0015] According to the technical solution of the embodiment of the present application, the width of the groove is greater than or equal to a first threshold (for example, the first threshold may be 0.1 mm, 0.5 mm) so that the current on the first part and the current on the second part will not affect each other through indirect coupling.

[0016] In combination with the first aspect, in some implementations of the first aspect, the length of the groove is greater than or equal to 3 mm.

[0017] In combination with the first aspect, in some implementations of the first aspect, the length of the groove is less than or equal to 15 mm.

[0018] In combination with the first aspect, in some implementations of the first aspect, the wearable device further includes a speaker, and the second end of the ground layer is electrically connected to the speaker.

[0019] In combination with the first aspect, in some implementations of the first aspect, the wearable device further includes a microphone, and the second end of the ground layer is electrically connected to the microphone.

[0020] In combination with the first aspect, in some implementations of the first aspect, the radiator is used to generate a first resonance and a second resonance, the resonance point frequency of the first resonance is lower than the resonance point frequency of the second resonance, and the resonance frequency band of the second resonance includes the first frequency band.

[0021] In combination with the first aspect, in some implementations of the first aspect, the first frequency band includes 2.4 GHz-2.485 GHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a wearable device provided in an embodiment of the present application.

[0023] Figure 2 is a schematic diagram of a wearable device 100 provided in an embodiment of the present application.

[0024] Figure 3 yes Figure 2 The radiation efficiency simulation result of the antenna formed by the radiator in the wearable device 100 is shown.

[0025] Figure 4 is a schematic diagram of a wearable device 100 provided in an embodiment of the present application.

[0026] Figure 5 yes Figure 4 Schematic diagram of the ground layer 231 in the wearable device 100 shown.

[0027] Figure 6 yes Figure 4 FIG. 1 is a schematic diagram of current distribution in the ground layer 231 of the wearable device 100 .

[0028] Figure 7 yes Figure 4 Schematic diagram of the ground layer 231 in the wearable device 100 shown.

[0029] Figure 8 yes Figure 4 The radiation efficiency simulation result of the antenna formed by the radiator in the wearable device 100 is shown. DETAILED DESCRIPTION

[0030] The following explains the terms that may appear in the embodiments of the present application.

[0031] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupled 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 the physical contact and electrical conduction between components; it can also be understood as the connection between different components in the circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals; "indirect coupling" can be understood as two conductors being electrically conductive in an airless / non-contact manner. In one embodiment, indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by coupling between the gaps between two conductive parts to form an equivalent capacitor.

[0032] Component / device: includes at least one of lumped component / device and distributed component / device.

[0033] Lumped component / device: refers to the collective name for all components when the size of the component is much smaller than the wavelength relative to the circuit operating frequency. For the signal, regardless of any time, the component characteristics always remain fixed and are independent of frequency.

[0034] Distributed components / devices: Unlike lumped components, if the size of the component is similar to or larger than the wavelength relative to the circuit operating frequency, then when the signal passes through the component, the characteristics of each point of the component itself will vary due to changes in the signal. At this time, the component as a whole cannot be regarded as a single entity with fixed characteristics, but should be called a distributed component.

[0035] Capacitance: It can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to capacitive components, such as capacitors; distributed capacitance (or distributed capacitance) refers to the equivalent capacitance formed by two conductive parts separated by a certain gap.

[0036] Inductance: It can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to inductive components, such as inductors; distributed inductance (or distributed inductance) refers to the equivalent inductance formed by a certain length of conductive parts.

[0037] Radiator: It is a device in the antenna used to receive / send electromagnetic wave radiation. In some cases, the "antenna" in a narrow sense is understood as a radiator, which converts the waveguide energy from the transmitter into radio waves, or converts radio waves into waveguide energy, which is used to radiate and receive radio waves. The modulated high-frequency current energy (or waveguide energy) generated by the transmitter is transmitted to the transmitting radiator via the feeder line, and is converted into a certain polarized electromagnetic wave energy by the radiator and radiated in the desired direction. The receiving radiator converts a certain polarized electromagnetic wave energy from a specific direction in space into modulated high-frequency current energy, which is transmitted to the receiver input via the feeder line.

[0038] The radiator may include a conductor with a specific shape and size, such as a linear or sheet shape, etc., and the present application does not limit the specific shape. In one embodiment, the linear radiator can be simply referred to as a linear antenna. In one embodiment, the linear radiator can be implemented by a conductive frame, which can also be referred to as a frame antenna. In one embodiment, the linear radiator can be implemented by a bracket conductor, which can also be referred to as a bracket antenna. In one embodiment, the linear radiator, or the radiator of the linear antenna, has a wire diameter (for example, including thickness and width) much smaller than the wavelength (for example, the dielectric wavelength) (for example, less than 1 / 16 of the wavelength), and the length can be compared with the wavelength (for example, the dielectric wavelength) (for example, the length is about 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of linear antennas are dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, and inverted F antennas (IFA). For example, for a dipole antenna, each dipole antenna generally includes two radiating branches, and each branch is fed by a feeding portion from the feeding end of the radiating branch. For example, an inverted F antenna can be regarded as a monopole antenna with a ground path added. The IFA antenna has a feeding point and a grounding point, and is called an inverted F antenna because its side view is an inverted F shape. In one embodiment, the sheet radiator may include a microstrip antenna, or a patch antenna, such as a planar inverted F antenna (PIFA). In one embodiment, the sheet radiator may be implemented by a planar conductor (such as a conductive sheet or a conductive coating, etc.). In one embodiment, the sheet radiator may include a conductive sheet, such as a copper sheet, etc. In one embodiment, the sheet radiator may include a conductive coating, such as a silver paste, etc. The shapes of the sheet radiator include circular, rectangular, annular, etc., and 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 floor, wherein the dielectric substrate is arranged between the radiator and the floor.

[0039] The radiator may also include a slot or a slit formed on the conductor, for example, a closed or semi-closed slot or slit formed on a grounded conductor surface. In one embodiment, a slotted or slitted radiator may be referred to as a slot antenna or a slot antenna. In one embodiment, the radial dimension (e.g., including the width) of the slot or slit of the slot antenna / slot 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 about 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, a radiator with a closed slot or slit may be referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or slit (e.g., an opening is added to a closed slot or slit) may be referred to as an open slot antenna. In some embodiments, the slot shape is a long strip. In some embodiments, the length of the slot is about half a wavelength (e.g., the dielectric wavelength). In some embodiments, the length of the slot is about an integer multiple of the wavelength (e.g., one times the dielectric wavelength). In some embodiments, the slot can be fed by a transmission line connected across one or both sides thereof, thereby exciting a radio frequency electromagnetic field on the slot and radiating electromagnetic waves into space. In one embodiment, the radiator of the slot antenna or slot antenna can be realized by a conductive frame with both ends grounded, which can also be called a frame antenna; in this embodiment, it can be regarded as that the slot antenna or slot antenna includes a linear radiator, which is spaced apart from the floor and grounded at both ends of the radiator, thereby forming a closed or semi-closed slot or slot. In one embodiment, the radiator of the slot antenna or slot antenna can be realized by a bracket conductor with both ends grounded, which can also be called a bracket antenna.

[0040] The feed circuit is a combination of all circuits used for receiving and transmitting radio frequency signals. The feed circuit may include a transceiver and an RF front end circuit. In some cases, the "feed circuit" is understood in a narrow sense as a radio frequency integrated circuit (RFIC), and the RFIC can be considered to include an RF front end chip and a transceiver. The feed circuit has the function of converting radio waves (e.g., radio frequency signals) and electrical signals (e.g., digital signals). Generally, it is considered to be part of the radio frequency.

[0041] In some embodiments, the electronic device may further include a test socket (or referred to as a radio frequency socket or a radio frequency test socket). The test socket may be used to insert a coaxial cable to test the characteristics of the radio frequency front-end circuit or the radiator of the antenna through the cable. The radio frequency front-end circuit may be considered as a circuit portion coupled between the test socket and the transceiver.

[0042] In some embodiments, the RF front-end circuit may be integrated into a RF front-end chip in the electronic device, or the RF front-end circuit and the transceiver may be integrated into a RF chip in the electronic device.

[0043] It should be understood that any two of the first / second / …Nth feeding circuits in the present application can share the same transceiver, for example, transmitting signals through a RF channel in a transceiver (for example, a port (pin) of a RF chip); they can also share a RF front-end circuit, for example, processing signals through a switch or amplifier in a RF front-end.

[0044] It should also be understood that two feeding circuits in the first / second / ...Nth feeding circuits in the present application usually correspond to two radio frequency test sockets in the electronic device.

[0045] The matching circuit is a circuit used to adjust the radiation characteristics of the antenna. In one embodiment, the matching circuit is coupled between the feed circuit and the corresponding radiator. In one embodiment, the matching circuit is coupled between the test socket and the radiator. Generally, the matching circuit is a combination of circuits coupled between the radiator and the floor. In one embodiment, the matching circuit may include a switch and / or an electronic component, and the switch may be an electronic component for switching the coupling connection of the radiator. The matching circuit has the function of impedance matching and / or frequency tuning. Generally, it is considered to be a part of the antenna.

[0046] The grounding structure / feeding structure may include a connector, such as a metal spring, and the radiator is coupled to the floor through the grounding structure / feeding structure is coupled to the feeding circuit. In some embodiments, the feeding structure may include a transmission line / feeding line, and the grounding structure may include a grounding line.

[0047] End / point: The "end / point" in the first end / second end / feeding end / grounding end / feeding point / grounding point / connection point of the antenna radiator cannot be narrowly understood as an end point or end portion that is physically disconnected from other radiators, but can also be considered as a point or a section on a continuous radiator. In one embodiment, the "end / point" may include a connection / coupling area on the antenna radiator that is coupled to other conductive structures. For example, the feed end / feeding point may be a coupling area on the antenna radiator that is coupled to a feed structure or a feed circuit (for example, an area facing a portion of the feed circuit). For another example, the ground end / grounding point may be a connection / coupling area on the antenna radiator that is coupled to a ground structure or a ground circuit.

[0048] Open end, closed end: In some embodiments, the open end and the closed end are, for example, relative to whether they are grounded. The closed end is grounded, and the open end is not grounded. In some embodiments, the open end and the closed end are, for example, relative to other conductors. The closed end is electrically connected to other conductors, and the open end is not electrically connected to other conductors. In one embodiment, the open end can also be referred to as a suspended end, a free end, an open end, or an open-circuit end. In one embodiment, the closed end can also be referred to as a grounded end or a short-circuit end. It should be understood that in some embodiments, other conductors can be coupled and connected through the open end to transfer coupling energy (which can be understood as transferring current).

[0049] In some embodiments, the "closed end" can also be understood from the perspective of current distribution. The closed end or the grounded end, etc., can be understood as a point with larger current on the radiator, or as a point with smaller electric field on the radiator. In one embodiment, the current distribution characteristics of larger current / small electric field can be maintained by coupling electronic devices (for example, capacitors, inductors, etc.) through the closed end. In one embodiment, the current distribution characteristics of larger current / small electric field can be maintained by opening a gap at or near the closed end (for example, a gap filled with insulating material).

[0050] In some embodiments, the "open end" can also be understood from the perspective of current distribution. The open end or suspended end, etc., can be understood as a point with smaller current on the radiator, or as a point with larger electric field on the radiator. In one embodiment, coupling electronic devices (for example, capacitors, inductors, etc.) through the open end can maintain the current distribution characteristics of the smaller current point / larger electric field point.

[0051] It should be understood that coupling the radiator end at a gap (from the perspective of the structure of the radiator, it is similar to a radiator at an opening of an open end or a suspended end) with electronic devices (for example, capacitors, inductors, etc.) can make the radiator end a point with larger current / smaller electric field. In this case, it should be understood that the radiator end at the gap is actually a closed end or a grounded end, etc.

[0052] The “suspended radiator” mentioned in the embodiments of the present application means that the radiator is not directly connected to the feeder line / feeder branch and / or the grounding line / grounding branch, but is fed and / or grounded through indirect coupling.

[0053] It should be understood that the "suspended" in "suspended end" or "suspended radiator" does not mean that there is no structure around the radiator to support it. In one embodiment, the suspended radiator can be, for example, a radiator disposed on the inner surface of the insulating back cover.

[0054] The current same direction / reverse direction mentioned in the embodiments of the present application should be understood as the direction of the main current on the conductor on the same side is the same direction / reverse direction. For example, when stimulating a distributed current in the same direction on a conductor that is bent or annular (for example, the current path is also bent or annular), it should be understood that, for example, the main current stimulating on the conductors on both sides of the annular conductor (for example, a conductor surrounding a gap, on the conductors on both sides of the gap) is opposite in direction, but it still belongs to the definition of the distributed current in the same direction in the embodiments of the present application. In one embodiment, the current same direction on a conductor may refer to the current on the conductor having no reverse point. In one embodiment, the current reverse on a conductor may refer to the current on the conductor having at least one reverse point. In one embodiment, the current same direction on two conductors may refer to the current on both conductors having no reverse point and flowing in the same direction. In one embodiment, the current reverse on two conductors may refer to the current on both conductors having no reverse point and flowing in opposite directions. The current same direction / reverse direction on multiple conductors can be understood accordingly.

[0055] Resonance / resonance frequency: The resonance frequency is also called the resonance frequency. The resonance frequency may refer to the frequency at which the imaginary part of the antenna input impedance is zero. The resonance frequency may have a frequency range, that is, the frequency range in which resonance occurs. The frequency corresponding to the strongest resonance point is the center frequency point frequency. The return loss characteristic of the center frequency may be less than -20dB. It should be understood that, unless otherwise specified, the first resonance mentioned in this application for the antenna / radiator "generating the first resonance" should be the fundamental mode resonance generated by the antenna / radiator, or the lowest frequency resonance generated by the antenna / radiator.

[0056] Resonance frequency band / communication frequency band / working frequency band: Regardless of the type of antenna, it always works within a certain frequency range (band width). For example, an antenna that supports the B40 frequency band has a working frequency band that includes frequencies in the range of 2300MHz to 2400MHz, or in other words, the working frequency band of the antenna includes the B40 frequency band. The frequency range that meets the index requirements can be regarded as the working frequency band of the antenna.

[0057] Electrical length: It can refer to the ratio of physical length (ie mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave. The electrical length can satisfy the following formula:

[0058]

[0059] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0060] Wavelength: or operating wavelength, which can be the wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonant frequency is 1920MHz to 1980MHz) is 1955MHz, then the operating wavelength can be the wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, "operating wavelength" can also refer to the wavelength corresponding to the non-center frequency of the resonant frequency or the operating frequency band.

[0061] It should be understood that the wavelength of the radiation signal in the air can be calculated as follows: (wavelength in air, or wavelength in vacuum) = speed of light / frequency, where frequency is the frequency of the radiation signal (MHz), and the speed of light can be taken as 3×108 m / s. The wavelength of the radiation signal in the medium can be calculated as follows: Among them, ε is the relative dielectric constant of the medium. The wavelength in the embodiments of the present application generally refers to the dielectric wavelength, which can be the dielectric wavelength corresponding to the center frequency of the resonant frequency, or the dielectric wavelength corresponding to the center frequency of the working frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonant frequency is 1920MHz to 1980MHz) is 1955MHz, the wavelength can be the dielectric wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, "dielectric wavelength" may also refer to the dielectric wavelength corresponding to the non-center frequency of the resonant frequency or the working frequency band. For ease of understanding, the dielectric wavelength mentioned in the embodiments of the present application can be simply calculated by the relative dielectric constant of the medium filled on one or more sides of the radiator.

[0062] End: The first end (second end) of the antenna radiator, as well as the ground end or open end, cannot be narrowly understood as a point, but can also be considered as a section of the radiator on the antenna radiator including the first endpoint, and the first endpoint is the endpoint of the antenna radiator at the first gap. For example, the first end of the antenna radiator can be considered as a section of the radiator within a first wavelength range of one sixteenth of the first endpoint, wherein the first wavelength can be a wavelength corresponding to the working frequency band of the antenna structure, a wavelength corresponding to the center frequency of the working frequency band, or a wavelength corresponding to the resonance point.

[0063] Antenna system efficiency (total efficiency): refers to the ratio of input power to output power at the antenna port.

[0064] Antenna radiation efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power of the electromagnetic wave part that is effectively converted) 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 and the ohmic loss power of the metal and / or the dielectric loss power. The radiation efficiency is a value that measures the radiation ability of the antenna. Metal loss and dielectric loss are both factors that affect the radiation efficiency.

[0065] Those skilled in the art can understand that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between efficiency and dB. The closer the efficiency is to 0 dB, the better the efficiency of the antenna.

[0066] Ground (GND): can refer to at least a part of any grounding layer, grounding plate, or grounding metal layer in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, grounding plates, or grounding components, etc. "GND" can be used for grounding components in electronic devices. In one embodiment, "ground" can be a grounding layer of a circuit board of an electronic device, or a grounding plate formed by a frame of an electronic device, or a grounding metal layer formed by a metal film under a screen. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12 to 14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a routing layer, and the routing layer and the grounding layer are electrically connected through vias. In one embodiment, components such as a display, a touch screen, input buttons, a transmitter, a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on or connected to a circuit board; or electrically connected to a wiring layer and / or a ground layer in the circuit board. For example, a radio frequency source is disposed on the wiring layer.

[0067] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material can be any of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. It will be appreciated by those skilled in the art that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0068] Grounding: refers to coupling with the above-mentioned ground / floor in any way. In one embodiment, grounding can be achieved through physical grounding, such as physical grounding (or physical ground) at a specific position on the frame through some structural parts of the middle frame. In one embodiment, grounding can be achieved through device grounding, such as grounding through devices such as capacitors / inductors / resistors connected in series or in parallel (or device ground).

[0069] The technical solution provided in this application is applicable to wearable devices that adopt one or more of the following communication technologies: 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, (5th generation, 5G) communication technology and other future communication technologies.

[0070] Figure 1 This is a structural schematic diagram of a wearable device provided in an embodiment of the present application, which is illustrated by taking a wireless headset as an example.

[0071] like Figure 1 , which is a structural schematic diagram of a wireless headset 100, which may be, for example, a TWS Bluetooth headset. The wireless headset 100 may be divided into an ear bag portion 1 and an ear handle portion 2. The ear bag portion 1 is connected to one end of the ear handle portion 2. The earplug 1 may be accommodated or embedded in the auricle of the user, and the ear handle portion 2 may be hung on the edge of the auricle of the user and located on the periphery of the auricle of the user.

[0072] like Figure 1 As shown in (a) and (c) of FIG. 1 , the ear handle portion 2 can be further divided into a connecting segment 21 connected to the ear bag portion 1, and a top segment 22 and a bottom segment 23 located on both sides of the connecting segment 21. The top segment 22, the connecting segment 21 and the bottom segment 23 of the ear handle portion 2 are arranged in sequence along the longitudinal direction of the wireless headset. In the present application, the longitudinal direction can be the extension direction of the ear handle portion 2 (such as Figure 1 The Y axis shown in (a) is also the length direction of the ear handle 2. The two ends in the longitudinal direction can be the top end and the bottom end respectively. The top section 22, the connecting section 21 and the bottom section 23 can be an integrated structure or a split structure.

[0073] like Figure 1As shown in (b) of FIG. 1 , the ear handle portion 2 can also be divided into a connecting section 21 connected to the ear bag portion 1, and a bottom section 23 located on one side of the connecting section 21. The connecting end 21 is connected between the ear bag portion 1 and the bottom section 23. The connecting section 21 and the bottom section 23 are distributed along the longitudinal direction of the wireless headset 100. That is, in the present application, the wireless headset 100 may or may not have the following configuration: Figure 1 The top section 22 shown in (a) and (c).

[0074] like Figure 1 As shown in (a) and (b) of FIG. 1 , the wireless headset 100 may include a housing 10. The housing 10 may be used to accommodate various components of the wireless headset 100. The housing 10 may include a main housing 101, a bottom housing 102, and a side housing 103.

[0075] The main housing 101 can cover part of the bottom section 23 of the ear handle 2, the connecting section 21 of the ear handle 2, the top section 22 of the ear handle 2, and the portion of the ear bag 1 connected to the connecting section 21. The main housing 101 can form a first opening 1011 at the bottom section 23 of the ear handle 2, and a second opening 1012 at the ear bag 1. The first opening 1011 and the second opening 1012 can be used to load the components in the wireless headset 100.

[0076] The bottom shell 102 may be located at the bottom of the bottom section 23 of the ear handle portion 2. The bottom shell 102 may be fixedly connected to the main shell 101 through the first opening 1011. In one possible implementation, the connection between the bottom shell 102 and the main shell 101 is a detachable connection (e.g., a snap-fit ​​connection, a threaded connection, etc.) to facilitate subsequent repair (or maintenance) of the wireless headset 100. In another possible implementation, the connection between the bottom shell 102 and the main shell 101 may be a non-detachable connection (e.g., glued) to reduce the risk of the bottom shell 102 accidentally falling off, which is beneficial to improving the reliability of the wireless headset 100.

[0077] The side shell 103 may be located on a side of the ear bag portion 1 away from the ear handle portion 2. The side shell 103 may be fixedly connected to the main shell 101 through the second opening 1012. In one possible implementation, the connection between the side shell 103 and the main shell 101 is a detachable connection (e.g., a snap-fit ​​connection, a threaded connection, etc.) to facilitate subsequent repair (or maintenance) of the wireless headset 100. In another possible implementation, the connection between the side shell 103 and the main shell 101 may also be a non-detachable connection (e.g., glued) to reduce the risk of accidental detachment of the side shell 103, which is beneficial to improving the reliability of the wireless headset 100.

[0078] One or more sound holes 1031 may be provided on the side housing 103, so that the sound inside the housing 10 can be transmitted to the outside of the housing 10 through the sound holes 1031. The shape, position, number, etc. of the sound holes 1031 may not be limited in the present application.

[0079] It should be understood that the present application may not limit the number and position of the openings on the housing 10. Different wireless headsets 100 may have different numbers and / or different positions of openings. Figure 1 As shown in (c) of FIG. 1 , the housing 10 may include a first housing 104 and a second housing 105. A third opening 1041 may be formed on the first housing 104. The first housing 104 may be fixedly connected to the second housing 105 through the third opening 1041. Figure 1 In the example shown in (c) in FIG. 1 , the wireless headset 100 may have a smaller number of openings.

[0080] It should be understood that Figure 1 The structures of the wireless headset 100 shown are only some examples. The wireless headset 100 may also have other different embodiments. Figure 1 The wireless headset 100 shown is taken as an example for detailed description.

[0081] Figure 2 is a schematic diagram of a wearable device 100 provided in an embodiment of the present application.

[0082] like Figure 2 As shown, the wearable device 100 may include a radiator 210 , a PCB 220 , and a flexible printed circuit (FPC) 230 .

[0083] The first end of the radiator 210 may be coupled to the PCB 220 . The first end of the FPC 230 is electrically connected to the PCB 220 , and the second end thereof extends toward the ear bag portion of the wearable device 100 .

[0084] exist Figure 2 In the wearable device 100 shown, the first end of the radiator 210 is a ground end, and the second end is an open end. Ideally, when the radiator 210 generates the first resonance, the current path on the radiator 210 is one quarter of the first wavelength, and the current path on the floor (for example, the metal layer in the PCB) is one quarter of the first wavelength, and the first wavelength is generated by the half-wavelength mode. However, in actual production or design, since the FPC230 is coupled to the PCB220 (for example, the ground layer of the FPC230 is coupled to the metal layer of the PCB220), the path of the current on the floor is extended by the FPC230, so that when the first resonance is generated by the half mode, the second resonance is also generated by the three-quarter mode.

[0085] exist Figure 2 In the wearable device 100 shown, the first resonance and the second resonance can be generated by the half mode and the three-quarter mode respectively. However, a pit of radiation efficiency will be generated between the resonance point frequency of the first resonance and the resonance point frequency of the second resonance, such as Figure 3 shown.

[0086] It should be understood that, taking the working frequency band of the wearable device 100 including the Bluetooth frequency band (2.4 GHz-2.485 GHz) as an example, the radiation efficiency pit in this frequency band will affect the communication quality of the wearable device 100 and reduce the user experience.

[0087] In the simulation results of radiation efficiency provided in the embodiments of the present application, the horizontal axis (x-axis) represents the operating frequency (GHz) of the antenna, and the vertical axis (y-axis) represents the radiation efficiency of the antenna at this frequency (the ratio of the power radiated into space by the antenna to the power input to the antenna). The larger the value of the vertical axis, the more power the antenna radiates into space under the same input power, and the better the radiation performance of the antenna.

[0088] An embodiment of the present application provides a wearable device, which can provide good communication quality within a working frequency band by opening a gap in the ground layer of an FPC located in an ear bag portion.

[0089] Figure 4 is a schematic diagram of a wearable device 100 provided in an embodiment of the present application.

[0090] like Figure 4 As shown, the wearable device 100 may include a radiator 210 , a PCB 220 , and an FPC 230 .

[0091] The radiator 210 and the PCB 220 are located at the ear handle 301 of the wearable device 100. The first end of the radiator 210 can be coupled to the PCB 220. In one embodiment, the first end of the radiator 210 is coupled to the metal layer 221 in the PCB 220, and the metal layer 221 can serve as a floor in the wearable device 100.

[0092] Part of the FPC 230 may be located at the ear handle portion 301 of the wearable device 100, and part of the FPC 230 may be located at the ear bag portion 302 of the wearable device 100. The FPC 230 includes a ground layer, a first end of the ground layer is electrically connected to the PCB 220, and a second end of the ground layer is located at the ear bag portion 302 of the wearable device 100. In one embodiment, the first end of the ground layer is coupled to the metal layer 221 in the PCB 220.

[0093] It should be understood that the ground layer can be used as a floor in FPC 230 to reduce mutual interference between electrical signals transmitted in the signal layer in FPC 230. The signal layer can be spaced apart from the ground layer, and a flexible medium can be provided between the signal layer and the ground layer to avoid short circuit between the two.

[0094] Furthermore, since the ground layer is coupled to the metal layer 221 in the PCB 220, the ground layer and the metal layer 221 can be used together as the floor in the wearable device 100. The ground layer can be used to realize the grounding of the electronic components arranged on the FPC 230 to filter out clutter and reduce interference between electronic components. For example, the grounding pin of the chip arranged on the FPC is electrically connected to the ground layer, and the active electronic components such as the speaker, pickup, and switch arranged on the FPC are electrically connected to the ground layer.

[0095] In one embodiment, the radiator 210 can be used to generate a first resonance and a second resonance, and the resonance point frequency of the first resonance is lower than the resonance point frequency of the second resonance. In one embodiment, the resonance frequency band of the second resonance includes the first frequency band. The operating frequency band of the wearable device 100 includes the first frequency band.

[0096] It should be understood that the radiator 210 is used to generate the first resonance and the second resonance, which can be understood as the radiator 210, the PCB 220 and the FPC 230 jointly generating the first resonance and the second resonance.

[0097] The second end of the ground layer 231 includes a groove 232, such as Figure 5 The distance between the closed end of the slot 232 and the end 2312 of the second end of the grounding layer 231 is smaller than the distance between the open end of the slot 232 and the end 2312 of the second end of the grounding layer 231. The slot 232 is a structure with one end open and the other end closed.

[0098] It should be understood that the FPC 230 may further include a plurality of ends extending toward the ear bag portion, and the second end may be understood as the end farthest from the first end (end portion) among the plurality of ends extending toward the ear bag portion of the FPC 230 .

[0099] In one embodiment, the ground layer 231 is divided into a first portion 233 and a second portion 234 by the groove 232 , and the first portion 233 and the second portion 234 are connected at a closed end of the groove 231 .

[0100] In one embodiment, when the radiator resonates, the current on the first portion 233 is opposite to the current on the second portion 234. Figure 6 shown.

[0101] It should be understood that when the radiator 210 resonates, the current on the first portion 233 flows from the open end of the slot to the closed end, and the current on the second portion 234 flows from the closed end of the slot to the open end in the opposite direction of the current on the first portion 233. Therefore, the second portion 234 can extend the current path of the radiator 210 when it resonates.

[0102] At the same time, since the electrical length of the second part 234 is approximately one-quarter of the first wavelength (greater than or equal to one-eighth of the first wavelength, and less than or equal to three-eighths of the first wavelength), the first wavelength is the wavelength corresponding to the second resonance. Since the electrical length of the second part 234 is approximately one-quarter of the first wavelength, this part has little effect on the resonance point frequency of the second resonance. However, for the first resonance, since the electrical length of the second part 234 is approximately one-quarter of the wavelength (first wavelength) corresponding to the second resonance, which is less than one-quarter of the wavelength corresponding to the first resonance, the working mode of the first resonance will not be changed, which is equivalent to extending the current path during the first resonance, so that the resonance point frequency of the first resonance is shifted to a low frequency, so that the resonance point frequency of the first resonance and the resonance point frequency of the second resonance will produce a pit of radiation efficiency outside the first frequency band, which will not affect the communication quality of the wearable device 100.

[0103] In one embodiment, the width of the groove 232 is greater than or equal to 0.1 mm. In one embodiment, the width of the groove 232 is greater than or equal to 0.5 mm.

[0104] It should be understood that the width of the slot 232 can be understood as the minimum distance between the conductors on both sides. In one embodiment, the conductors on both sides of the slot 232 can be parallel (the widths of each position of the slot 232 are the same). Alternatively, in one embodiment, the conductors on both sides of the slot 232 may not be parallel (the widths of at least two positions of the slot 232 are different).

[0105] Meanwhile, the width of the slot 232 is greater than or equal to a first threshold (for example, the first threshold may be 0.1 mm or 0.5 mm), so that the current on the first portion 233 and the current on the second portion 234 will not affect each other through indirect coupling.

[0106] In one embodiment, the length of the slot 232 may be greater than or equal to 3 mm. In one embodiment, the length of the slot 232 may be less than or equal to 15 mm.

[0107] It should be understood that the length of the slot 232 can be understood as the distance between the closed end and the open end of the slot 232 in the extension direction of the FPC 230. Alternatively, in one embodiment, the length of the slot 232 can be greater than or equal to 3 mm, which can also be understood as the length of the second portion 234 being greater than or equal to 3 mm. In one embodiment, the length of the slot 232 can be less than or equal to 15 mm, which can also be understood as the length of the second portion 234 being less than or equal to 15 mm.

[0108] In one embodiment, the groove 232 may be located at the center of the second end of the ground layer 231, and the width of the first portion 233 and the width of the second portion 234 may be substantially the same (the ratio of the width of the first portion 233 to the width of the second portion 234 is greater than or equal to 0.9 and less than or equal to 1.1), such as Figure 5 shown.

[0109] It should be understood that the width of the first portion 233 or the width of the second portion 234 can be understood as the minimum value of the width of the first portion 233 or the minimum value of the width of the second portion 234 .

[0110] In one embodiment, the groove 232 may be offset from the center of the second end of the ground layer 231 , and the width of the first portion 233 is greater than the width of the second portion 234 (eg, the ratio of the width of the first portion 233 to the width of the second portion 234 is greater than 1).

[0111] In one embodiment, the groove 232 may be located at the edge of the second end of the ground layer 231. Figure 7 In one embodiment, the ratio of the width of the first portion 233 to the width of the second portion 234 is greater than or equal to 4.

[0112] It should be understood that when the groove 232 can be located at the edge of the second end of the ground layer 231, the width of the first part 233 is wider and can be used as a complete floor. A signal line can be set above the first part 233, which is beneficial to improve the utilization rate of the ground layer 231.

[0113] In one embodiment, the width of the second portion 234 is greater than or equal to 0.1 mm, so that the current on the second portion 234 has a good transmission path.

[0114] In one embodiment, the first frequency band includes a Bluetooth frequency band (2.4 GHz-2.485 GHz). It should be understood that the wearable device 100 can establish a communication connection with an electronic device including a receiving antenna through the Bluetooth frequency band.

[0115] In one embodiment, the wearable device 100 further includes a feeding circuit 240, such as Figure 4The radiator 210 includes a feeding point 211 , and the feeding circuit 240 is coupled to the feeding point 211 for feeding an electrical signal to the radiator 210 .

[0116] In one embodiment, the length of the radiator 210 between the feed point 211 and the first end (ground end) of the radiator 210 is greater than the length of the radiator 210 between the feed point 211 and the second end (open end) of the radiator 210 .

[0117] It should be understood that the radiator 210 can form a structure similar to a left-handed antenna, and the quarter-wavelength mode of the left-handed antenna is used as an example for explanation. The left-handed antenna can, for example, be an antenna that conforms to a composite right and lefthand (CRLH) transmission line structure.

[0118] In one embodiment, the length of the radiator 210 between the feeding point 211 and the end of the second end of the radiator 210 is less than 5 mm, which can better achieve miniaturization of the antenna 200.

[0119] In one embodiment, the second end of the ground layer 231 includes a first connection point 235, such as Figure 5 The first connection point 235 can be electrically connected to the speaker of the wearable device.

[0120] In one embodiment, the second end of the ground layer 231 includes a second connection point 236, such as Figure 5 The second connection point 236 can be electrically connected to the microphone of the wearable device.

[0121] In one embodiment, the distance between the open end of the slot 232 and the first connection point 235 and / or the second connection point 236 is greater than the distance between the closed end of the slot 232 and the first connection point 235 and / or the second connection point 236 .

[0122] In actual production or application, the open end and the closed end of the groove 232 can be determined according to the first connection point 235 and / or the second connection point 236, the open end is far away from one of the first connection point 235 and the second connection point 236, and the closed end is close to one of the first connection point 235 and the second connection point 236.

[0123] Figure 8 yes Figure 4 The radiation efficiency simulation result of the antenna formed by the radiator in the wearable device 100 is shown.

[0124] It should be understood that for the sake of simplicity of discussion, the first frequency band includes the Bluetooth frequency band (2.4GHz-2.485GHz) as an example for explanation. In actual production or design, other frequency bands may also be included, and the embodiments of the present application do not limit this.

[0125] like Figure 8 As shown, compared to Figure 2 The wearable device 100 shown, Figure 4 In the wearable device 100 shown, a groove is provided at the second end of the ground layer of the FPC, which extends the path of the current and has a greater impact on the resonance point of the first resonance, causing the resonance point frequency to shift toward a low frequency.

[0126] Since the resonance point frequency of the first resonance is shifted toward low frequency, the radiation efficiency pit between the resonance point of the first resonance and the resonance point of the second resonance is also shifted toward low frequency and moved out of the frequency band of the first frequency band. The radiation efficiency of the wearable device 100 in this frequency band is not affected by the pit and has good communication quality.

[0127] Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0128] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wearable device, characterized in that: The wearable device comprises an ear bag portion and an ear handle portion, wherein a first end of the ear handle portion is connected to the ear bag portion, and the wearable device further comprises: a radiator, the radiator being located at the ear handle; A printed circuit board PCB, wherein the PCB is located at the ear handle, and the radiator is coupled to the PCB; A flexible circuit board (FPC), the FPC comprising a grounding layer, a first end of the grounding layer being coupled to the PCB, a second end of the grounding layer being located at the ear bag portion, the second end of the grounding layer comprising a groove, a distance between a closed end of the groove and an end of the second end of the grounding layer being smaller than a distance between an open end of the groove and an end of the second end of the grounding layer.

2. The wearable device according to claim 1, characterized in that: The ground layer is divided into a first portion and a second portion by the groove, the width of the first portion is greater than the width of the second portion, and the width of the second portion is greater than or equal to 0.1 mm.

3. The wearable device according to claim 1 or 2, characterized in that: The ground layer is divided into a first portion and a second portion by the groove, and a ratio of a width of the first portion to a width of the second portion is greater than 1.

4. The wearable device according to any one of claims 1 to 3, characterized in that: The ground layer is divided into a first portion and a second portion by the groove, and a ratio of a width of the first portion to a width of the second portion is greater than or equal to 4.

5. The wearable device according to any one of claims 1 to 4, characterized in that: The ground layer is divided into a first part and a second part by the groove; When the radiator resonates, the currents on the first part and the second part flow in opposite directions.

6. The wearable device according to any one of claims 1 to 5, characterized in that: The width of the groove is greater than or equal to 0.1 mm.

7. The wearable device according to any one of claims 1 to 6, characterized in that: The width of the groove is greater than or equal to 0.5 mm.

8. The wearable device according to any one of claims 1 to 7, characterized in that: The length of the groove is greater than or equal to 3 mm.

9. The wearable device according to any one of claims 1 to 8, characterized in that: The length of the groove is less than or equal to 15 mm.

10. The wearable device according to any one of claims 1 to 9, characterized in that: The wearable device also includes a speaker, and the second end of the ground layer is electrically connected to the speaker.

11. The wearable device according to any one of claims 1 to 10, characterized in that: The wearable device also includes a microphone, and the second end of the ground layer is electrically connected to the microphone.

12. The wearable device according to any one of claims 1 to 11, characterized in that: The radiator is used to generate a first resonance and a second resonance, the resonance point frequency of the first resonance is lower than the resonance point frequency of the second resonance, and the resonance frequency range of the second resonance includes the first frequency range.

13. The wearable device according to claim 12, characterized in that: The first frequency band includes 2.4 GHz-2.485 GHz.

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