CN112350047B

CN112350047B - Wearable equipment

Info

Publication number: CN112350047B
Application number: CN201910753593.1A
Authority: CN
Inventors: 兰尧
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-06
Filing date: 2019-08-15
Publication date: 2022-07-12
Anticipated expiration: 2039-08-15
Also published as: CN112350047A; WO2021023083A1

Abstract

The application provides a wearable device, which comprises a shell and an antenna; wherein the housing has a preset surface for contact with a user when the wearable device is worn on the user; the antenna comprises a radiation part and a feed part which is positioned in the shell and used for coupling and feeding the radiation part, wherein the included angle range of one surface of the radiation part close to the plane where the preset surface is located and the plane where the preset surface is located is 0-30 degrees, and the radiation part at least comprises a radiation structure used for flowing at least one pair of currents with opposite flow directions. When the preset surface of the wearable device is contacted with a user, each pair of currents with opposite flowing directions on the radiation structure can excite a pair of induced currents with opposite directions on the surface of the skin of the user, the pair of induced currents with opposite directions can at least cancel a part of each other, the signal power loss of the antenna is reduced, the power of the antenna for communicating with external wireless equipment can be increased, and the communication quality of the wireless earplugs and the external wireless equipment is further improved.

Description

Wearable equipment

This application claims priority from chinese patent application filed on 6/8/2019 under the name "an earbud antenna" with chinese patent office, application No. 201910722136.6, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of communication, in particular to a wearable device.

Background

With the maturity of mobile communication technology, wearable devices for wireless communication have become popular, and the wearable devices include wireless earplugs, smart glasses, smart watches, smart bracelets, and the like.

However, when the wearable device in the prior art is used, a part of the signal emitted by the antenna in the wearable device is lost by a human body, which results in a reduction in communication quality between the wearable device and other devices. For example, the wireless earplugs worn on the left ear and the right ear need to establish good communication with each other to ensure that the two wireless earplugs cooperate with each other to generate sound effects such as stereo sound, and signals sent by the antenna of the wireless earplugs are easily absorbed by human bodies, so that the sound effect quality of the wireless earplugs is poor.

Disclosure of Invention

The application provides a wearable device for reduce the signal power loss of antenna wherein, with promotion antenna and external wireless device's communication quality, and then improve wearable device's use and experience.

In a first aspect, a wearable device is provided, which includes a housing and an antenna, in order to reduce signal power loss of the antenna and improve communication effect of the antenna; wherein the housing has a preset surface for contact with a user when the wearable device is worn on the user; the antenna comprises a radiation part and a feed part which is positioned in the shell and used for coupling and feeding the radiation part, wherein the included angle range of one surface of the radiation part close to the plane where the preset surface is located and the plane where the preset surface is located is 0-30 degrees, and the radiation part at least comprises a radiation structure used for flowing at least one pair of currents with opposite flow directions. When the preset surface of the wearable device is contacted with a user, each pair of currents with opposite directions on the radiation structure can excite a pair of induced currents with opposite directions on the skin surface of the user, the pair of induced currents with opposite directions can at least partially cancel each other, the signal power loss of the antenna is reduced, the power of the antenna for communicating with an external wireless device is increased, and the communication quality of the wireless earplug and the external wireless device is further improved.

In a specific embodiment, since the intensity of the induced current excited on the skin surface of the user by each pair of currents flowing in opposite directions on the radiating structure is mainly related to the length of the current path of the current on the radiating structure, the radiating structure at least comprises a symmetrical structure, so that two currents of the pair of currents flowing in opposite directions on the radiating structure respectively flow along the symmetrical current paths in the symmetrical structure, so that the lengths of the current paths of each pair of currents on the radiating structure tend to be consistent as much as possible, and when the magnitudes of each pair of currents in opposite directions on the radiating structure are equal or close, each pair of currents in opposite directions on the radiating structure can excite a pair of induced currents in opposite directions or close to each other on the skin surface of the user, and the pair of induced currents can cancel each other as much as possible, thereby reducing the signal power loss of the antenna, so as to improve the communication quality between the antenna and the external wireless equipment.

The radiation structure may have various forms as long as the radiation structure can flow at least one pair of currents in opposite directions, and in a specific embodiment, the radiation structure includes at least one first radiation element having a straight line shape, and the first radiation element includes two first sub-radiators connected by an end portion; the position of the feed part coupled with the first radiation unit for feeding is positioned at the connection position of the two first sub-radiators. In one first radiation unit, when a feed portion feeds power to the connection position of two first sub-radiation bodies in a coupling mode, current provided by the feed portion is divided into two paths at the connection position of the two first sub-radiation bodies, wherein the first path of current flows to the free end of the first sub-radiation body, the second path of current flows to the free end of the other first sub-radiation body in the direction opposite to that of the first path of current, and the two paths of current can excite a pair of induced currents which are opposite in direction and can be mutually offset on the surface of the skin of a user; with this type of radiation structure, a pair of currents in opposite directions can be generated by only one first radiation unit with only one feeding unit.

In a specific implementation, in one of the first radiation units, the lengths of the two first sub-radiators are substantially equal, so that the lengths of current paths of currents flowing in the two first sub-radiators in the one first radiation unit are substantially equal, for example, in the one first radiation unit, the length ratio of the one first sub-radiator to the other first sub-radiator is greater than or equal to 1 and less than or equal to 1.3, so that the currents flowing in the two first sub-radiators induce two induced currents with the same magnitude and opposite directions on the skin surface of the user, so as to cancel the two induced currents with each other as much as possible.

In a specific embodiment, in order to make induced currents excited by each first radiation unit on the skin surface of the user not interfere with each other as much as possible, the induced currents excited by each first radiation unit can be cancelled by themselves, the number of the first radiation units is multiple, and the centers of the multiple first radiation units are located on the same straight line perpendicular to the preset surface. In some cases, the plurality of first radiation units are located in the same plane, centers of the first radiation units are overlapped, the space in the wearable device is saved, and distances between the first radiation units and the skin surface of a user are equal as much as possible, so that when the first radiation lengths are the same or close to each other, currents flowing on the first radiation units excite induced currents which are uniformly distributed in all directions on the skin surface of the user, self-cancellation of each pair of induced currents is facilitated, and meanwhile, the radiation performance of the antenna is improved.

In another specific embodiment, the radiating structure comprises at least one first radiating element, and each first radiating element comprises two second sub-radiators which are arranged along a straight line and are electrically isolated; and the feeding part is coupled with one end of each group of the first radiating units, which is adjacent to the two second sub-radiators. When the feed portion respectively feeds the two first sub-radiating bodies in each group in a coupling mode, one current flows from one end, close to the second sub-radiating body, of the first second sub-radiating body to the other end of the first second self-radiating body, the other current flows from one end, close to the first second sub-radiating body, of the second sub-radiating body to the other end of the second self-radiating body, the two currents distributed on the two second sub-radiating bodies respectively flow in opposite directions, and induced currents which are opposite in direction and capable of being offset can be excited on the surface of the skin of a user.

In a specific implementation, in order to improve the radiation performance of the antenna, the number of the second sub-radiators may be multiple, and the multiple second sub-radiators are arranged in a central symmetry manner.

In order to make each current in the radiating portion have a current which is paired with the current in the radiating portion and has an opposite direction, the radiating portion may have a central symmetrical pattern, and the positive feed terminal is coupled to the symmetrical center of the radiating portion, so that induced currents excited in the first region by the current flowing along the radiating portion can cancel each other. For example, the radiating portion may be a circular, rectangular or elliptical conductive sheet.

In addition, the structure of the radiation part can be a planar sheet structure, and can also be set according to the internal space of the wearable device in other forms, for example, in a specific embodiment, the side surface of the radiation part close to the plane where the preset surface is located includes a curved surface, and the included angle range between the tangent plane of any point on the curved surface and the preset surface is 0-30 degrees, so as to ensure that the radiation part can be parallel to the skin surface of the user as far as possible when the wearable device is worn, thereby being capable of being fully coupled with the human body of the user, improving the aperture of the antenna, and improving the radiation performance of the antenna.

In a specific embodiment, the feeding portion comprises a positive feeding terminal and a feeding line connecting the radiating portion and the positive feeding terminal, and the current path length of the feeding line is more than 0.01 lambda and less than 0.125 lambda; the sum of the lengths of the current paths of the feeder line and one of the currents flowing in opposite directions on the radiation part is more than or equal to 0.20 lambda and less than 0.25 lambda, wherein lambda is the conduction wavelength corresponding to the working frequency band of the antenna; thereby, the radiation performance of the antenna is improved.

In a specific embodiment, the feeding portion is coupled to a feeding point on the radiating portion, a distance between the feeding point and an edge of the radiating portion is greater than or equal to 0.125 λ, where λ is a conduction wavelength corresponding to an operating frequency band of the antenna, so that path lengths of each pair of currents respectively listed on opposite sides of the feeding point along any direction are not too different, induced currents excited by the pair of currents on a skin surface of a user in opposite directions can sufficiently cancel each other out, and a current flowing from the feeding point to the edge of the radiating portion along each direction is more uniformly distributed without being excessively concentrated in a certain direction, which is beneficial to improving radiation performance of the antenna and prolonging a life of the antenna.

In a more specific embodiment, the radiation portion is in a central symmetry pattern, the distance from the feed point to the symmetry center of the radiation portion is less than or equal to 0.05 λ, λ is a conduction wavelength corresponding to an operating frequency band of the antenna, so that the path lengths of each pair of currents respectively arranged on two opposite sides of the feed point along any direction are not too different, induced currents in opposite directions excited by the pair of currents on the skin surface of a user can be sufficiently offset, and the current flowing from the feed point to the edge of the radiation portion along each direction is more uniformly distributed without being excessively concentrated in a certain direction, which is beneficial to improving the radiation performance of the antenna and prolonging the service life of the antenna.

When the position of the radiation part is specifically set, various modes can be provided, and in a specific embodiment, the antenna further comprises a grounding part which is arranged opposite to the radiation part; the grounding part is fixedly connected with the shell; the radiation part is positioned between the plane of the preset surface and the grounding part; or the radiation part is positioned on one side of the grounding part departing from the plane of the preset surface.

The wearable device can be in various forms, in a specific form, the wearable device is a wireless earplug, the wireless earplug further comprises a loudspeaker arranged in the shell, the loudspeaker is located between the grounding part and the preset surface, and a horn mouth of the loudspeaker faces the preset surface; the radiation portion is located the speaker and predetermines between the surface, and the radiation portion can increase the bore of antenna with human coupling, promotes radiation performance, or, the radiation portion is located one side that ground connection portion deviates from the speaker, can avoid the radiation portion to cause to shelter from to the play sound of predetermineeing the surface direction to the speaker, promotes the quality of the speaker sound that the user's ear was gathered.

In a particular embodiment, the housing of the wireless ear bud includes a body portion including a front end wall and a circumferential sidewall connected to the front end wall; the loudspeaker and the grounding part are both arranged in the main body part; wherein, the front end wall comprises an inner side surface and an outer side surface which are oppositely arranged; the radiation part is arranged on the inner side face or the outer side face of the front end wall, and the preset surface is the outer side face.

In another specific embodiment, the inner side surface or the outer side surface of the circumferential side wall is provided with an extended radiating arm coupled with the radiating part, or at least part of the structure of the circumferential side wall is made of a conductive material and the part of the circumferential side wall made of the conductive material is coupled with the radiating part, so that an electric field radiated from the grounding part to the skin surface of a user can be shielded by the extended radiating arm or the structure made of the conductive material in the circumferential side wall, the signal power loss is reduced, and the communication quality of the wireless earplug and an external wireless device is improved.

When the radiation device is specifically arranged, the projection of the extension radiation arm on the circumferential side wall is overlapped with a part of the projection of the grounding part on the circumferential side wall; or at least part of the structure of the circumferential side wall is made of a conductive material, and the projection of the structure made of the conductive material in the circumferential side wall on the circumferential side wall is overlapped with a part of the projection of the grounding part on the circumferential side wall; while avoiding partial electric field from radiating to the skin surface of the user by the grounding part, the structure that the extension radiation arm or the circumferential side wall is made of conductive material does not wrap the grounding part completely, the grounding part of the antenna can radiate electromagnetic waves outwards to communicate with external wireless equipment, and the grounding part of the antenna has better communication quality with the external wireless equipment due to the reduction of signal power at the ear of the user.

When the wireless earplug is specifically arranged, the thickness range of the radiation part can be 0.35 mm-1.0 mm, so that the situation that the radiation part is too thin and the strength is not enough is avoided, and meanwhile, the situation that the radiation wavelength of the radiation part is not qualified due to the fact that the radiation part is too thick is avoided; the maximum size range of the orthographic projection of the radiation part on the front end wall is 5-13 mm so as to adapt to the space size in the wireless earplug.

The ground portion may be formed by a ground metal layer on the circuit board, a conductive trace, or a metal skin of the battery, and in a specific embodiment, the metal structure in the speaker may also serve as at least a portion of the ground portion.

When the wearable device is a wireless earplug, the housing comprises a main body part and a handle part, and the handle part is connected with the main body part, wherein the main body part is provided with a preset surface; the ground portion and the radiating portion may be both provided in the handle portion in addition to the main body portion.

In another specific embodiment, the wearable device is a wrist band device, the housing comprises a bottom cover and an enclosure wall, the bottom cover is formed at a bottom port of the enclosure wall, the bottom cover has an inner side and an outer side which are opposite to each other, and the predetermined surface is the outer side; the radiation part can be formed in various ways, for example, the radiation part is formed in the inner cavity of the shell, or the radiation part is formed on the inner side surface, the outer side surface or the inside of the bottom cover, in this case, the thickness of the radiation part can range from 0.35mm to 1.0mm, so as to ensure the strength of the radiation part and radiate electromagnetic waves with proper wavelength; or at least part of the structure of the bottom cover is made of a conductive material, the part of the bottom cover made of the conductive material is used as the radiation part, and the thickness of the bottom cover ranges from 0.7mm to 1.2 mm.

In a specific embodiment, in the wristband apparatus, the surrounding wall may be made of a conductive material and serve as at least a part of the grounding portion, and the bottom cover may be entirely made of a conductive material and serve as the radiation portion, and an electrical isolation member may be provided between the surrounding wall and the bottom cover to prevent a short circuit between the grounding portion and the radiation portion.

In a specific embodiment, in the wristband device, the maximum size of the orthographic projection of the radiation portion on the inner side face of the bottom cover ranges from 8mm to 45mm to ensure the radiation intensity of the antenna while making full use of the space within the wristband device.

In another specific embodiment, the wearable device may also be glasses, and when the wearable device is glasses, the housing includes a temple, and the predetermined surface is a surface of the temple for contacting the head of the user.

Drawings

FIG. 1a is a schematic view of a wireless earplug of the prior art when worn at a user's ear;

FIG. 1b is an enlarged view of a portion of FIG. 1a at H;

FIG. 2 is a schematic view of a wireless ear bud in an embodiment of the present application;

fig. 3 is a schematic diagram of an exemplary external structure of a wireless ear bud according to an embodiment of the present application;

FIG. 4a is an exemplary illustration of a wireless ear bud according to an embodiment of the present application when worn on a user's ear;

FIG. 4b is an enlarged view of a portion of FIG. 4a at I;

FIG. 4c is an exemplary cross-sectional view of the body portion and internal components of a wireless earbud according to an embodiment of the present disclosure;

fig. 5a is a schematic view of an exemplary view of the radiation section from the front a to the back B in fig. 4 a;

FIG. 5b is a graph showing the effect of the simulation of the standing wave of the antenna when the wireless ear plug of FIG. 4a adopts the structure of the radiating portion shown in FIG. 5 a;

FIG. 5c is a graph of the efficiency of the antenna when the wireless ear bud of FIG. 4a employs the structure of the radiating portion shown in FIG. 5 a;

FIG. 5d is a directional diagram of the antenna of the wireless ear bud of FIG. 4a employing the structure of the radiating portion shown in FIG. 5 a;

fig. 5e is a schematic view of another exemplary view of the radiating portion in fig. 4a, viewed from the front a in the direction of the rear B;

fig. 5f is a further exemplary illustration of the radiation section viewed from the front a in the direction of the rear B in fig. 4 a;

fig. 5g is a schematic view of another exemplary view of the radiating portion in fig. 4a, viewed from the front a in the direction of the rear B;

fig. 5h is a further exemplary illustration of the radiation section viewed from the front a in the direction of the rear B in fig. 4 a;

FIG. 6a is another exemplary illustration of a wireless ear bud according to an embodiment of the present application when worn on a user's ear;

FIG. 6b is an enlarged view of a portion J of FIG. 6 a;

fig. 6c is another exemplary cross-sectional view of the body portion and internal components of a wireless earbud according to embodiments of the present application;

FIG. 6d is another exemplary illustration of a wireless ear bud according to an embodiment of the present application when worn on a user's ear;

FIG. 6e is an enlarged view of a portion of FIG. 6d at K;

FIG. 6f is an exemplary cross-sectional view of the body portion, its interior and exterior components of the wireless earbud of the present embodiment;

FIG. 7a is another exemplary illustration of a wireless ear bud according to an embodiment of the present application when worn on a user's ear;

FIG. 7b is an enlarged view of a portion of FIG. 7a at L;

FIG. 8a is another exemplary illustration of a wireless ear bud of an embodiment of the present application when worn on a user's ear;

FIG. 8b is an enlarged view of a portion of FIG. 8a at N;

fig. 9a is a schematic view of an exemplary version of the radiation section in fig. 8a, viewed from the front a in the direction of the rear B;

fig. 9B is a schematic view of another exemplary view of the radiating portion in fig. 8a, viewed from the front a in the direction of the rear B;

FIG. 10a is another exemplary illustration of a wireless ear bud of the present application when worn on a user's ear in an embodiment of the present application;

FIG. 10b is an enlarged view of a portion of FIG. 10a at R;

fig. 10c is a schematic view of an exemplary view of the radiating portion in fig. 10a, viewed from the front a in the direction of the rear B;

fig. 10d is a schematic view of another exemplary view of the radiating portion viewed from the front a in the direction of the back B in fig. 10 a;

FIG. 11a is an exemplary schematic view of the internal structure of a wristband apparatus according to an embodiment of the present application;

FIG. 11b is a schematic view of an exemplary view of the radiating portion of FIG. 11a looking in a negative direction along the z-axis;

fig. 12 is an exemplary schematic diagram of a radio frequency transceiver feeding an antenna when the wearable device is a wristband device in the embodiment of the present application;

FIG. 13a is an exemplary schematic view of the embodiment of the present application when the glasses are worn on the head of the user;

fig. 13b is an enlarged view of the internal structure diagram of the main unit portion viewed in the direction F in fig. 13 a;

FIG. 13c is an enlarged view of a portion of FIG. 13b at T;

fig. 14 is an exemplary schematic diagram of a radio frequency transceiver feeding an antenna when the wearable device is glasses in the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

To facilitate understanding of the wearable devices provided in the embodiments of the present application, a description will first be given of application scenarios of the wearable devices, which may be wireless earplugs, wrist band devices (including but not limited to smart watches and smart bracelets), smart glasses, and the like. When the wearable device is worn on a human body, signals sent by an antenna in the wearable device are easily lost by the human body, so that the communication quality of the wearable device and other devices is poor.

Take a wireless earplug as an example:

fig. 1a shows a schematic view of a conventional wireless earplug when worn on an ear of a user, and fig. 1b is a partial enlarged view at H in fig. 1a, and referring to fig. 1a and 1b, the wireless earplug comprises a shell 100, the shell 100 comprises a main body portion 110 having a speaker port 111 and a handle portion 120 extending from the main body portion 110 along direction Q, when the main body portion 110 is worn in the ear 210, sound emitted from a speaker in the main body portion 110 enters an ear canal 220 through the speaker port 111, and at this time, the handle portion 120 is generally close to being parallel to a skin surface (e.g., a surface of an orthographic projection area 231) in an orthographic projection area 231 on a face 230 of the user; the antenna is disposed in the handle 120, the antenna includes a resonating element 130 and a ground 133 (the resonating element 130 and the ground 133 are respectively formed by metal traces respectively listed on opposite sides of a circuit substrate 134), the resonating element 130 is generally in the form of a resonating element of a monopole antenna such as an inverted-F antenna or an inverted-L antenna, and with continued reference to fig. 1a, the resonating element 130 includes a resonating element arm 131 and a feed 132, the resonating element arm 131 and the ground 133 are disposed opposite to each other and both extend in a Q direction in the handle 120, the feed 132 is connected to one end of the resonating element arm 131 in a P direction, when the feed 132 is fed by a signal source such as a radio frequency transceiver, a current I in the Q direction is present in the resonating element arm 131, and the current I excites an induced current I 'in a direction opposite to the current I direction in a forward projection area 231 on the user's face 230, and the presence of the induced current I 'causes a portion of a signal emitted from the antenna of the wireless earbud to be lost due to the human body' having a resistance, thus, the wireless ear bud worn by the ear 210 on one side of the user's head reduces the signal power used to communicate with other devices (e.g., a smart watch, a cell phone, or a wireless ear bud worn by the ear on the other side of the user's head), ultimately resulting in poor communication quality of the wireless ear bud with other devices.

In order to solve the problem of poor communication quality with other devices in the wireless ear bud, the embodiment of the present application provides the following wireless ear bud 10:

fig. 2 schematically shows a wireless earplug provided by an embodiment of the present application, please refer to fig. 2, in which the wireless earplug 10 can wirelessly communicate with an external wireless device 71 through a wireless link 72, and the external wireless device 71 can be another wireless earplug for being paired with the wireless earplug 10, and can also be a smart watch, smart glasses, a smart band, or a mobile phone, etc.; the wireless link 72 may be a cellular telephone link, Near-Field Communication (NFC) link, or the like,

A link,

Links, millimeter wave communication links, ZigBee links, NB-IoT links, or other wireless communication links, etc.

The wireless ear bud 10 also includes a control unit 11, the control unit 11 including, but not limited to, processing circuitry and memory circuitry, wherein the processing circuitry may include a plurality of processors (e.g., microcontrollers, digital signal processors, baseband processors, etc.) and memory circuitry (volatile and non-volatile memory)Reservoir), and the like. The control unit 11 may implement a protocol including cellular telephony,

Protocol,

Protocols, etc., to enable the wireless ear bud 10 to wirelessly communicate with an external wireless device 71.

The wireless ear bud 10 also includes input and output components 12, such as a speaker for emitting sound to the user's ear and a proximity sensor for identifying whether the wireless ear bud 10 is worn on the user's ear, among other components 12. The control unit 11 is coupled to the input-output component 12 (e.g., to send control signals to a speaker for sound emission or to receive signals from a proximity sensor that the wireless ear bud 10 has been worn on or detached from the user's ear).

In addition, the wireless earplug 10 also includes a radio frequency transceiver 13 (e.g., a cellular telephone transceiver, a "near" transceiver, etc.),

Transceiver and

transceiver, etc.) and an antenna 16, wherein the control unit 11 is coupled with the radio frequency transceiver 13, the radio frequency transceiver 13 is coupled with the antenna 16 through a transmission line 14, and the control unit 11 can control the radio frequency transceiver 13 to transceive signals through the antenna 16; illustratively, the transmission line 14 includes a positive signal line 14a and a ground signal line 14b, the antenna 16 has a feeding portion 21 (see fig. 4b), the feeding portion 21 has a positive feeding terminal 15a coupled to a radiating portion 25 (see fig. 4a and 4b) of a resonating element 20 (see fig. 4a) in the antenna 16 and a ground feeding terminal 15b coupled to ground in the antenna 16, the positive signal line 14a is coupled to the positive feeding terminal 15a, and the ground signal line 14b is coupled to the ground feeding terminal 15 b; the transmission line 14 may be directly coupled to the radiating portion 25 of the resonant element of the antenna 16 and the ground portion of the antenna 16, or may be first coupled to a near-field coupling feed that is coupled to the antenna by near-field couplingThe radiating portion of the resonating element of antenna 16 or the ground portion of antenna 16 is coupled, e.g., positive signal line 14a is directly coupled to a near-field coupling feed that is coupled to the radiating portion of the resonating element of antenna 16 by way of near-field coupling.

In addition, the wireless ear bud 10 includes a battery 17, the battery 17 being used to power the control unit 11, the input-output part 12, the radio frequency transceiver 13, and the like.

Fig. 3 illustrates an exemplary external structure of a wireless earplug 10 of an embodiment of the present application, and referring to fig. 3, the wireless earplug 10 has a front side a and a back side B, and the wireless earplug 10 includes a shell 300, the shell 300 includes a main body portion 310 and a handle portion 320, the handle portion 320 may have an elongated extension structure extending from the main body portion 310 along a direction D (fig. 3 exemplarily shows that an end of the handle portion in the direction C is connected to an end of the main body portion 310 near the back side B), the handle portion 320 is configured to facilitate the wireless earplug 10 to be fixed to an ear, for example, the handle portion 320 is clamped between a tragus and an antitragus of a user, and at the same time, the handle portion 320 is convenient for the user to grasp to facilitate the handling of the wireless earplug 10, the handle portion 320 may have a bending structure in addition to the straight-bar structure shown in fig. 3, and the bending structure may be used to clamp an auricle, and the material of the shell 300 includes, but is not limited to plastics, One or the combination of any of carbon fiber, ceramic and other dielectric materials; the main body portion 310 has at least one surface (i.e., a predetermined surface) for being attached to (or close to and approximately parallel to) an inner side surface of the ear, for example, the predetermined surface may be an outer side surface (which may refer to reference numeral 90A in fig. 3) of a front end wall 312 of the main body portion 310 on the front surface a side in fig. 3, or may be one side surface of a circumferential side wall 313, the main body portion 310 is provided with at least one speaker port 311, for example, the speaker port 311 is formed in the front end wall 312 of the main body portion 310 (but may also be provided in a side surface of the main body portion 310 facing other directions than the front surface a and the back surface B, such as the circumferential side wall 313, which is not shown in fig. 3), and a dust-proof net (including but not limited to being made of plastics and ceramic materials) is installed at the speaker port 311; it should be noted that in fig. 3, the shape of the main body portion 310 is exemplarily shown to approximate a cylinder, however, the main body portion 310 does not have to be a cylinder shape, and may be other shapes, for example, the shape of a portion for inserting into the ear of a user in a common wired or wireless ear plug.

In a specific embodiment, fig. 4a shows an exemplary schematic view when the wireless ear bud is worn on the ear 410 of a user, fig. 4B is a partial enlarged view at I in fig. 4a, and fig. 4c shows a cross-sectional view of the main body portion 320 and its internal components of the wireless ear bud, wherein fig. 4c only shows the relative position relationship of the main body portion 320 and its components, and does not show the actual structure of the components in the wireless ear bud 10, and referring to fig. 4a, fig. 4B and fig. 4c, in the main body portion 310, from an end near the back side B to an end near the front side a, a first circuit board 18a, a battery 17, a second circuit board 18B, a speaker 23 and a resonant element 20 are sequentially disposed, wherein the first circuit board 18a, the battery 17, the second circuit board 18B, the speaker 23 and the resonant element 20 are all fixed relative to the main body portion 310, the speaker 23 is disposed in alignment with the speaker port 311, the horn outlet of the loudspeaker 23 is directed towards the loudspeaker port 311, the resonator element 20 comprises a radiating portion 25 and a feeding portion 21, the side of the radiating portion 25 directed towards the front end wall 312 is parallel or approximately parallel to the outer side of the front end wall 312, for example, the angle between the side of the radiating portion 25 directed towards the front end wall 312 and the plane of the outer side of the front end wall 312 (i.e. the predetermined surface 90A) is within a first set range, which may be 0 ° to 30 °, for example, 0 °, 5 °, 10 °, 20 °, 30 °, etc., fig. 4a only shows the side of the radiating portion 25 directed towards the front end wall 312 to be parallel to the outer side of the front end wall 312 by way of example; in fig. 4a, as viewed from the front a to the back B of the wireless ear plug, the radiating portion 25 is exemplarily shaped as a circular sheet structure as shown in fig. 5a, the radiating portion 25 may be a conductive sheet structure formed of a metal foil, a metal film (formed on the inner side of the front end wall 312, for example, by laser engraving or metal spraying), a metal sheet, a graphene film, a conductive trace or other conductive structure, the radiating portion 25 may be made of any one or more of gold, silver, cylinder, aluminum, metal alloy, graphene and other conductive materials, the feeding portion 21 has a positive feeding terminal 15a coupled to the center of the radiating portion 25 and a ground feeding terminal 15B coupled to the ground of the antenna 16, the rf transceiver 13 on the second circuit board 18B is coupled to the positive feeding terminal 15a through a positive signal line 14a and to the ground terminal 15B through a ground signal line 14B, for feeding radio frequency signals to the radiating portion 25 of the resonating element 20 of the antenna 16 and to the ground of the antenna 16, respectively, wherein the positive signal line 14a and the ground signal line 14b are exemplarily configured in the flexible radio frequency cable 22, and the positive signal line 14a and the ground signal line 14b may also be configured in a flexible circuit board or other suitable carrier.

In fig. 4a, the ground feed terminal 15b is exemplarily coupled with a metal structure (e.g. a metal housing) of the loudspeaker 23; illustratively, the second circuit board 18B may further have a second ground metal layer 19 thereon, the second ground metal layer 19 may be a conductive trace, a conductive film layer, a metal sheet, a metal foil or other conductive structure formed on the surface of the second circuit board 18B, the second ground metal layer 19 may also be formed in the middle of the insulating medium of the second circuit board 18B, it should be noted that, in fig. 4a, the second ground metal layer 19 is exemplarily located on the side of the second circuit board 18B facing the back surface B, the radio-frequency transceiver 13 is located on the side of the second circuit board 18B facing the front surface a, the second ground metal layer 19 may also be located on the side of the second circuit board 18B facing the front surface a, and the radio-frequency transceiver 13 is located on the side of the second circuit board 18B facing the back surface B, so that the second ground metal layer 19 can electromagnetically isolate the radio-frequency transceiver 13 from the radiation portion 25, to shield mutual interference between the radio frequency transceiver 13 and the radiating portion 25, the second ground metal layer 19 may serve as at least a part of a ground portion of the antenna 16; the first circuit board 18a may also have a first ground metal layer 26 similar to the second ground metal layer 19, and the first ground metal layer 26 may also serve as at least a part of the ground of the antenna 16; the metal case of the battery 17 may also serve as at least a part of the ground of the antenna 16; the ground feeding terminal 15b may be coupled to one or more of the metal structure of the speaker 23, the second ground metal layer 19, the first ground metal layer 26, or the metal housing of the battery 17 described above, or may short the metal structure of the speaker 23, the second ground metal layer 19, the first ground metal layer 26, and the metal housing of the battery 17 while coupled to one of the metal structure of the speaker 23, the second ground metal layer 19, the first ground metal layer 26, or the metal housing of the battery 17, for example, in fig. 4a, the metal structure of the speaker 23, the second ground metal layer 19, and the metal housing of the battery 17.

With continued reference to fig. 4a, with the front surface a of the wireless earbud 10 facing the head of the user, the body portion 310 of the wireless earbud 10 is placed in the recess structure of the ear 410, and the outer side surface (i.e., the predetermined surface 90A) of the front end wall 312 is flush with or approximately parallel to the bottom surface of the recess structure of the ear 410 (typically, the angle between the front end wall 312 and the bottom surface of the recess structure of the ear 410 is 0 ° to 20 °, which may be 0 °, 5 °, 10 °, 15 ° or 20 °, depending on the wearing condition of the user), the sound emitted from the speaker 23 reaches the ear canal 420 through the speaker port 311 of the front end wall 312 and is conducted to the auditory system of the user, and the orthographic projection of the radiating portion 25 on the bottom surface of the recess structure of the ear 410 is a first area 431; as shown in fig. 5a, the radiation portion 25 of the circular sheet structure may be divided into a plurality of first radiation elements in a narrow strip shape extending along a diameter of the radiation portion 25, wherein one of the first radiation elements extending in the C → D direction includes a first sub-radiator 25a and a first sub-radiator 25b arranged at both sides of a center (the center is coupled to the feeding portion 21) and extending along a radius of the radiation portion 25, and a current fed from the center of the radiation portion 25 to the radiation portion 25 is divided into a current I flowing along the first sub-radiator 25a₁And a current I flowing along the first sub-radiator 25b₂Wherein the current I₁And current I₂Are of the same length and in opposite directions, the current I1 excites a sense current I in the first region 431₁', current I₂Exciting an induced current I in a first region 431₂' when the resistance of the radiating portion 25 is uniform (e.g. the thickness is uniform and the material is the same), the induced current I in the first region 431₁' and the induced current I₂' the same magnitude and opposite direction, so that the induced current I₁' and the induced current I₂' mutually cancel; extending in the other diametrical direction in the radiating portion 25 on the same principleThe first radiation unit of (1) comprises a first sub-radiator 25c and a first sub-radiator 25d which are respectively arranged at two opposite sides of the center of a circle, the induced current excited in the first region 431 by the current in the first sub-radiator 25c and the induced current excited in the first region 431 by the first sub-radiator 25d can be mutually offset, and so on, the induced currents excited in the first region 431 by the first radiation unit which extends along each diameter in the circular radiation part 25 are mutually offset; compared with the induced current I' that is larger and cannot be cancelled in the forward projection area 231 due to the current I in fig. 1a, when the wireless earplug 10 shown in fig. 4a and 5a is worn, the induced current excited by the radiating portion 25 in the first area 431 is reduced, the power of the radio-frequency signal generated by the radio-frequency transceiver 13 is less lost in the first area 431, and the power of the signal for communicating with the external wireless device 71 is increased, so that the SAR (Specific Absorption rate) value is reduced, and the communication quality between the wireless earplug 10 and the external wireless device 71 is improved.

In addition, the radiation portion 25 may be short-circuited to the ground of the antenna 16 by the ground line 24, for example, in fig. 4a, the ground line 24 may short-circuit the radiation portion 25 to the metal housing of the speaker 23, but the ground line 24 may not be provided, and when the ground line 24 is not provided, it may be avoided to some extent that the current in the ground line 24 excites an induced current in the first area 431, so that a large amount of induced current remains in the first area 431, thereby increasing the signal power loss of the antenna 16 and reducing the communication quality.

In fig. 5a, the positive feed terminal 15a is exemplarily connected to the center of the radiation portion 25 through the feed line 21a, the conduction wavelength corresponding to the operating frequency band of the antenna 16 is represented as λ, and the length of the current path of the feed line 21a (from the positive feed terminal 15a to the connection point 15j of the feed line 21a and the radiation portion 25 in fig. 4b) is greater than 0.01 λ and less than 0.125 λ; the sum of the length of the current path from the connection point 15j of the power supply line 21a and the radiation portion 25 to any point of the edge of the radiation portion 25 (which is equivalent to the path from the center of the radiation portion 25 to any point on the edge of the radiation portion 25, that is, the radius of the radiation portion 25) and the length of the current path of the power supply line 21a is less than or equal to 0.25 λ, and in some cases, the sum of the length of the current path from the connection point 15j of the power supply line 21a and the radiation portion 25 to any point of the edge of the radiation portion 25 and the length of the current path of the power supply line 21a is only allowed to be slightly less than 0.25 λ (for example, greater than or equal to 0.20 λ and less than 0.25 λ), so that the current path passing through the center on the power supply line 21a and the radiation portion 25 can be equivalent to one radiation arm of a half-wave oscillator antenna, thereby improving radiation performance; for example, the current path length of the power supply line 21a is 0.01 λ and the radius of the radiation portion 420 is 0.23 λ, the current path length of the power supply line 21a is 0.02 λ and the radius of the radiation portion 420 is 0.22 λ, the current path length of the power supply line 21a is 0.03 λ and the radius of the radiation portion 420 is 0.21 λ, the current path length of the power supply line 21a is 0.04 λ and the radius of the radiation portion 420 is 0.20 λ, the current path length of the power supply line 21a is 0.05 λ and the radius of the radiation portion 420 is 0.18 λ, the current path length of the power supply line 21a is 0.08 λ and the radius of the radiation portion 420 is 0.16 λ, the current path length of the power supply line 21a is 0.14 λ and the radius of the radiation portion 420 is 0.09 λ, the current path length of the power supply line 21a is 0.20 λ and the radius of the radiation portion 420 is 0.03 λ, or the current path length of the power supply line 21a is 0.22 λ and the radius of the radiation portion 420 is 0.01 λ. In addition, for example, the thickness of the radiation portion 25 ranges from 0.35mm to 1.0mm, and may be, for example, 0.35mm, 0.5mm, 0.75mm, 1.0mm, etc., and when the plane of the radiation portion 25 facing the front end wall 312 is parallel to the side of the front end wall 312 facing the radiation portion 25, the maximum size range of the orthographic projection of the radiation portion 25 on the front end wall 312 (i.e., the diameter range of the orthographic projection, and actually the diameter range of the radiation portion 25 itself) ranges from 5mm to 13mm, and may be, for example, 5mm, 7mm, 10mm, 13mm, or other lengths, and it should be noted that "the maximum size of the orthographic projection of the radiation portion 25 on the front end wall 312" herein is understood to be the distance between two points at which the distance of the radiation portion 25 on the orthographic projection on the front end wall 312 is the largest.

Moreover, when the circular radiation portion 25 shown in fig. 5a is adopted and the positive feed terminal 15a is connected to the center of the radiation portion 25 through the feed line 21a, most of the current in the radiation portion 25 automatically selects a relatively short path to reach the edge of the radiation portion 25, whereas in fig. 5a, the point where the positive feed terminal 15a feeds the radiation portion 25 through the feed line 21a is located at the center of the radiation portion 25, and the distance from the center of the circle to any point on the edge of the radiation portion 25 is equal, then the current only flows to the edge of the radiation portion 25 along all directions in a uniformly distributed manner from the center of the circle, which is beneficial to improving the radiation performance of the antenna 16 and prolonging the service life of the antenna 16.

Fig. 5b shows the simulation effect of the standing wave when the radiation part 25 in fig. 4a is in the shape of fig. 5a, wherein the ordinate represents the reflection coefficient (S11 parameter) in dB, the abscissa represents the frequency, the curve indicated by the unit GHz is the simulation curve when the antenna 16 is worn on the ear 410 of the user, the curve indicated by the unit GHz is the simulation curve when the antenna 16 is located in Free Space (FS), and it can be seen from fig. 5b that the optimal operating frequency band when the antenna 16 is worn on the ear 410 of the user is 2.45GHz and the optimal operating frequency band when the antenna 16 is located in Free Space is 2.48 GHz; fig. 5c shows an efficiency diagram of the antenna 16, where the ordinate represents frequency and in dB, the abscissa represents frequency and in GHz, the curve (i) represents the system efficiency curve when the antenna 16 is exposed to free space, the curve (ii) represents the radiation efficiency curve when the antenna 16 is exposed to free space, the curve (iii) represents the system efficiency curve when the antenna 16 is worn with a wireless ear bud on a user's ear 410, fig. 4 shows a radiation efficiency curve of the antenna 16 when the wireless ear bud 10 is worn on the user's ear 410, as can be seen in fig. 5c, when the antenna 16 is at the optimal operating frequency band of 2.45GHz, and when the antenna 16 is worn on the ear 410 of the user and exposed to a free space relative to the antenna 16, the system efficiency of the antenna 16 is reduced by about 3dB, which is smaller than the reduction range (generally 6dB to 7dB) of the system efficiency when a monopole antenna such as an inverted F antenna or an inverted L antenna is adopted as an antenna of a wireless earplug in the prior art shown in fig. 1 a; figure 5d illustrates the directional pattern of the antenna 16 when in free space and when worn with the wireless ear bud 10 on the user's ear 410, where the axis is in dB along the radius of the directional diagram, curve (r) shows the antenna 16 being worn with the wireless ear bud on the user's ear 410, and Phi is 0, curve (c) indicates that the antenna 16 is exposed to free space, and the azimuth Phi is 0, curve c shows the exposure of the antenna 16 to free space, and an azimuth Phi of 0, curve (r) shows the antenna 16 being worn with the wireless ear bud on the user's ear 410, and the azimuth Phi 90, as can be seen from fig. 5d, when the antenna 16 is exposed to free space, there is a certain radiation blind spot, and the radiation intensity of the antenna 16 at these blind areas can be enhanced when the antenna 16 is worn at the user's ear.

The radiating portion 25 may also be rectangular as shown in fig. 5e when viewed from the front a to the back B of the wireless earplug 10, and when the plane of the radiating portion 25 facing the front end wall 312 is parallel to the side of the front end wall 312 facing the radiating portion 25, the maximum dimension of the orthographic projection of the radiating portion 25 on the front end wall 312 (i.e., the diagonal length range of the orthographic projection, and actually the diagonal length range of the radiating portion 25 itself) is 5mm to 13mm, such as 5mm, 7mm, 10mm, 13mm or other length. The positive feeding terminal 15a is coupled to the center of symmetry of the radiating portion 25, and divides the radiating portion 25 into a plurality of first radiating elements in the form of narrow strips extending in each linear direction through the center of symmetry of the radiating portion 25, and since the rectangle is a centrosymmetric figure, therefore, the first radiation elements passing through the center of symmetry of the radiation part 25 are all symmetrical with respect to the center of symmetry of the radiation part 25, as the first sub-radiator 25e and the first sub-radiator 25f are symmetrical with respect to the center of symmetry of the radiation part 25, induced currents in the first region 431 of the bottom surface of the groove structure of the ear 410 excited by currents in any one of the narrow strip-shaped first radiation elements passing through the center of symmetry of the radiation part 25 can be cancelled, for the rectangular radiation portion 25 as a whole, induced currents excited in the first region 431 by the currents flowing along the surface of the radiation portion 25 can cancel each other out; and it will be appreciated that the same effect can still be achieved when the radiating portion 25 is rotated to different angles about an axis passing through its centre of symmetry.

In addition, the radiating portion 25 may be a regular N-polygon (where N is a regular even number, such as a regular hexagon and a regular octagon, etc.), an ellipse, a parallelogram, or other centrosymmetric pattern, as viewed from the front a to the back B of the wireless earplug 10, and as long as the positive feeding terminal 15a is coupled to the symmetric center of the radiating portion 25, the induced currents excited in the first region 431 by the current flowing along the radiating portion 25 can cancel each other.

The radiation portion 25 may have a partially curved sheet-like structure in addition to a planar sheet-like pattern, or the radiation portion 25 may have a wholly curved sheet-like structure, that is, the side of the radiation portion 25 facing the front end wall 312 is at least partially curved, and the included angle between the tangent plane of any point on the curved surface and the preset surface 90A is not more than 30 °, for example, 0 °, 5 °, 10 °, 20 °, 30 °, and the like.

The radiating portion 25 of the wireless earplug 10 may also be of the following type:

the wireless earplug 10 may also have a shape as shown in fig. 5f when viewed from the front a to the back B, in fig. 5f, the radiating portion 25 is only formed by one narrow strip-shaped first radiating element extending along a straight line, the extending direction of the narrow strip-shaped first radiating element is exemplarily parallel to the outer side surface (i.e. the predetermined surface 90A) of the front end wall 312, the positive feed terminal 15a is coupled to the central position of the radiating portion 25, the radiating portion 25 includes a first sub-radiator 25g and a first sub-radiator 25h which are symmetrical with respect to the central position of the radiating portion 25, and the current in the first sub-radiator 25g and the induced current in the first sub-radiator 25h can cancel each other out in the first area 431; in some cases, the first sub-radiator 25g and the first sub-radiator 25h in fig. 5f may also be curved, and a tangent of any point on the curve may include an angle of not more than 30 ° with respect to the plane where the predetermined surface 90A is located, for example, 0 °, 5 °, 10 °, 20 °, 30 °, and the like; as another modification, as shown in fig. 5g, the radiation portion 25 may include a plurality of narrow strip-shaped first radiation units (e.g., the first radiation unit i, the first radiation unit j, and the first radiation unit k) extending along a straight line as shown in fig. 5f, an included angle between the plurality of narrow strip-shaped first radiation units is greater than zero, the first radiation units are located on the same plane and have coinciding centers, lengths of the first radiation units may be different or the same, the positive feed terminal 15a is coupled to a center of each first radiation unit, and induced currents excited by currents in the first area 431 of each first radiation unit may cancel each other; in addition, each of the first radiation units in fig. 5g may be separately disposed, for example, the symmetry centers of the first radiation units may be arranged along a common axis extending along a same straight line, and each of the first radiation units is exemplarily perpendicular to the common axis, and the common axis is perpendicular to the preset surface 90A (where "perpendicular" is not strictly perpendicular, for example, an included angle between the common axis and the perpendicular of the preset surface 90A is less than or equal to 25 °, and may be 5 °, 10 °, 15 °, 20 °, 25 ° or other included angle values), so that induced currents excited by each of the first radiation units on the surface of the first region 431 of the user ear 410 are ensured not to interfere with each other as much as possible, and induced currents excited by each of the first radiation units can be self-cancelled. The first radiation unit in the narrow strip shape in fig. 5f may not be parallel to the plane of the predetermined surface 90A, for example, the included angle between the first radiation unit and the plane of the predetermined surface 90A is less than or equal to 30 °, and may be 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, or other angles.

It should be noted that, if the shape of the radiation portion 25 is a triangle, a trapezoid, an irregular pattern of a regular M-polygon (M is a positive odd number, such as a regular pentagon and a regular heptagon) or other non-centrosymmetric pattern, or the radiation portion 25 is a centrosymmetric pattern but the positive feed terminal 15a is coupled with the middle portion of the radiation portion 25 and a portion except the symmetric center, as long as the radiation portion 25 includes a radiation structure meeting the following conditions in its entirety, the radiation portion 25 can achieve the purpose of reducing signal power loss to a certain extent and improving communication quality between the radiation portion 25 and the external wireless device 71, and the radiation structure meets the following conditions: the positive feed terminal 15a is coupled to a feed point on the radiating structure, and a portion U (e.g. the first sub-radiator 25a in fig. 5a) on one side of the feed point has a portion V (e.g. the first sub-radiator 25b in fig. 5a) matching the portion U on the other side of the feed point in the direction of any straight line passing through the feed point on the radiating structure, wherein the portion U and the portion V both belong to a part of the radiating structure. For example, the radiating portion 25 in fig. 5a, 5e, 5f and 5g is a radiating structure as a whole; fig. 5h illustrates another form of the radiating portion 25 of fig. 4a, viewed from the front a to the back B of the wireless ear bud 10, the radiating portion 25 illustratively being a fan-shaped structure with obtuse angles, the positive feed terminal 15a being coupled to the center of the fan-shaped structure, in this radiation section 25, the region S2 and the region S3 are arranged centrosymmetrically and can together constitute one of the above-described radiation structures, and, by way of example, if the extension continues outward beyond the region S2, resulting in the region S2 not being centered symmetrically with respect to the region S3, but since any one of the currents in the region S3 has a current in the region S2 in the opposite direction, the region S2 and the region S3 still constitute one of the above-mentioned radiating structures, since the current in the radiation portion 25 does not flow in the opposite direction to the current in the region S1 due to the absence of the region S4, the region S1 does not form part of the radiation structure described above. Although any induced current excited in the first region 431 by the current in the radiating portion 25 remains, at least some of the induced currents cancel each other out, and thus the signal power loss is reduced to some extent.

In addition, the positive feeding terminal 15a is coupled to a feeding point on the radiation portion 25, and when the radiation portion 25 is located in the central symmetrical pattern, if the feeding point is deviated from the symmetrical center of the radiation portion 25, the distance from the feeding point to the symmetrical center of the radiation portion 25 may be equal to or less than 0.05 λ, for example, 0.01 λ, 0.02 λ, 0.03 λ, 0.04 λ and 0.05 λ; regardless of whether the radiation section 25 is a centrosymmetric pattern or not, the feeding point is spaced from the edge of the radiation section 25 by 0.125 λ or more, for example, 0.125 λ, 0.150 λ, 0.175 λ, 0.200 λ, and 0.250 λ; wherein λ is the conduction wavelength corresponding to the operating frequency band of the antenna 16; also, exemplarily in some cases, a current path length from the feeding point to a point on the edge of the radiation part 25 along the first direction is substantially equal to a current path length from the feeding point to a point on the edge of the radiation part 25 along the second direction, and the "substantially equal" means that a ratio of the current path length from the feeding point to the point on the edge of the radiation part 25 along the first direction to the current path length from the feeding point to the point on the edge of the radiation part 25 along the second direction is less than or equal to 1.3, and specifically, referring to fig. 5f, lengths of the first sub-radiator 25g and the first sub-radiator 25h may not be completely equal, such as a length ratio of the first sub-radiator 25g to the first sub-radiator 25h is less than or equal to 1.3, and may be 1, 1.1, 1.2, 1.3, or other values.

In another specific embodiment, fig. 6a shows a variation of the wireless earplug 10 of fig. 4a, fig. 6b shows a partial enlarged view at J of fig. 6a, and fig. 6c shows a cross-sectional view of the body portion 320 and its internal components of the wireless earplug 10, wherein fig. 6c only shows the relative position of the body portion 320 and its various components, and does not show the actual structure of the various components of the wireless earplug 10, and referring to fig. 6a, 6b and 6c, the wireless earplug 10 of fig. 6a, 6b and 6c differs from the wireless earplug 10 of fig. 4a in that: the radiation portion 25 is exemplarily disposed closely to an inner side surface of the front end wall 312, the main body portion 310 has a circumferential sidewall 313 connected to an edge of the front end wall 312, the circumferential sidewall 313 is exemplarily in a circumferential curved shape, the front end wall 312 is perpendicular or approximately perpendicular to the circumferential sidewall 313, the circumferential sidewall 313 may also be in other irregular curved shapes, the inner side surface of the circumferential sidewall 313 of the main body portion 310 is covered with the extended radiation arm 28 made of a conductive material, the extended radiation arm 28 is coupled to the edge of the radiation portion 25, the extended radiation arm 28 may shield a part of the ground portion and stagger another part of the ground portion, i.e., a part of a projection of the ground portion on the circumferential sidewall 313 overlaps a projection of the extended radiation arm 28 on the circumferential sidewall 313, and a distance from an end of the extended radiation arm 28 close to the front surface a to an end of the extended radiation arm 28 close to the back surface B is less than or equal to 25mm, for example, 5mm, 10mm, 15mm, 20mm or 25mm, wherein the extension radiation arm 28 and the radiation part 25 may be of an integral structure, such as a metal film formed by laser engraving or metal spraying on the inner side of the front end wall 312 as the radiation part 25 and a metal film formed integrally with the radiation part 25 on the inner side of the circumferential side wall 313 of the main body part 310 as the extension radiation arm 28, and the extension radiation arm 28 and the radiation part 25 may also be of a conductive sheet structure formed of a metal foil, a stamped metal sheet, a conductive trace or other conductive structure. If the extended radiating arm 28 is not provided, the ground of the antenna 16 (such as the second ground metal layer 19, the casing of the battery 17 or the first ground metal layer 26) may radiate an electric field, which may generate a large induced current at the side of the groove structure of the ear portion 410 (such as the surface of the second area 432 and the surface of the third area 433), and after the extended radiating arm 28 is provided along the inner side of the circumferential sidewall 313 of the main body portion 310 as shown in fig. 6a, since the extended radiating arm 28 shields and shields a portion of the electric field radiated from the ground to the surface of the second area 432 and the surface of the third area 433, signal power loss is reduced, and communication quality between the wireless ear plug 10 and the external wireless device 71 is improved, and meanwhile, in some cases, the ground of the extended radiating arm 28 does not completely wrap the ground, the antenna 16 may radiate an electromagnetic wave to communicate with the external wireless device 71, and the ground of antenna 16 is better in communication quality with the outside world due to the reduced signal power at user ear 410.

Fig. 6d shows a variation of the wireless earplug 10 shown in fig. 6a, fig. 6e is a partially enlarged view at K in fig. 6d, and fig. 6f shows a cross-sectional view of the main body portion 320, its interior and its exterior of the wireless earplug 10, wherein fig. 6f only shows the relative positional relationship of the interior and exterior components of the main body portion 320, and does not show the actual structure of the components in the wireless earplug 10, and referring to fig. 6d, 6e and 6f, compared to fig. 6a, 6b and 6c, fig. 6d, 6e and 6f, the difference is that moving the radiating portion 25 to the outer side of the front end wall 312 (the side near the front face a) and the extended radiating arm 28 covering the outer side of the circumferential side wall 313 of the main body portion 310 can achieve the similar effect as the wireless earplug 10 in fig. 6a, 6b and 6c, i.e. can reduce the intensity of the electric field lines of the antenna 16 excited in the surface of the second region 432 and the third region 433, reducing signal power loss and improving the quality of communication between the wireless ear bud 10 and the external wireless device 71.

In addition to the form shown in fig. 6a and 6d, a part or the whole of the circumferential sidewall 313 of the main body 310 may be made of a conductive material such as metal, so that the edge of the radiation portion 25 is coupled to the circumferential sidewall 313 of the main body 310, the part of the circumferential sidewall 313 made of the conductive material overlaps a part of the orthographic projection of the ground portion on the circumferential sidewall 313, and the part of the circumferential sidewall 313 made of the conductive material can achieve the effect similar to the extended radiation arm 28 in fig. 6a, 6b and 6 c.

In fig. 4a, the radiation portion 25 may be attached to the front end wall 312, as in fig. 6a and 6d, the radiation portion 25 may be separated from the front end wall 312, and fig. 4a, 6a, and 6d show the attachment and separation of the radiation portion 25 to the front end wall 312 by way of example; and in fig. 4a, 6a and 6d, since the radiation portion 25 is located at one end of the main body portion 310 close to the front end wall 311, when the user wears the wireless earplug 10 on the ear portion 410, the radiation portion 25 can be coupled to the ear portion 410 (either directly as shown in fig. 4a and 6a or indirectly as shown in fig. 6 d), so as to increase the aperture of the antenna 16 (i.e., add the human body as a new radiator on the basis of the radiation portion 25), thereby further improving the radiation performance of the antenna 16.

In another specific embodiment, fig. 7a shows another wireless earplug 10 when worn on the ear 410 of a user, fig. 7B is a partial enlarged view of L in fig. 7a, and referring to fig. 7a and 7B, compared with the wireless earplug 10 in fig. 4a, the wireless earplug 10 shown in fig. 7a is different in that the radiating portion 25 is located on a side of the first circuit board 18a facing the back surface B, a side of the first circuit board 18a facing the back surface B is exemplarily provided with the first ground metal layer 26, the radiating portion 25 is opposite to the first ground metal layer 26, the side of the radiating portion 25 facing the front end wall 312 (i.e., the predetermined surface 90A) is parallel or approximately parallel to the front end wall 312 (e.g., an included angle between the side of the radiating portion 25 facing the front end wall 312 and the outer side of the front end wall 312 is 0 ° to 30 °, for example, 0 °, 5 °, 10 °, or both, 20 °, 30 °, or other angles); and the feeding portion 21 has a positive feeding terminal 15a coupled to the center of symmetry of the radiating portion 25 (for example only, the feeding point of the positive feeding terminal 15a coupled to the radiating portion 25 may also be disposed off the center of symmetry of the radiating portion 25) and a ground feeding terminal 15b coupled to the ground of the antenna 16 (fig. 7a merely exemplarily couples the ground feeding terminal 15b to the first ground metal layer 26, and may also be other portion coupled to the ground); an orthographic projection of the radiation part 25 on the bottom surface of the groove structure of the ear part 410 is a fourth area 431', exemplarily, the radio-frequency transceiver 13 is mounted on a side of the first circuit board 18a facing away from the back surface B, the radio-frequency transceiver 3 is coupled to the positive feed terminal 15a through the positive signal line 14a and coupled to the ground feed terminal 15B through the ground signal line 14B, the positive signal line 14a and the positive signal line 14a are configured in the flexible radio-frequency cable 22 (or other flexible transmission component such as a flexible circuit board), and the ground line 24 short-circuits the radiation part 25 and the first ground metal layer 26; when the radiating portion 25 is shaped as a central symmetrical pattern, the positive feeding terminal 15a is coupled to the symmetrical center of the radiating portion 25, so that the induced currents excited by the antenna 16 in the fourth region 431' can cancel each other out, thereby reducing the signal power loss of the wireless earplug 10 and improving the communication quality between the wireless earplug 10 and the external wireless device 71.

In another embodiment, fig. 8a shows another wireless ear bud 10 when worn on a user's ear 410, fig. 8B is a partial enlarged view of fig. 8a at N, fig. 9a shows a schematic view of the radiating portion 25 when viewed from the front a to the back B of the wireless ear bud 10, and referring to fig. 8a, 8B and 9a, fig. 8a differs from fig. 4a in that each resonant element 20 includes a radiating portion 25 disposed between the front end wall 312 and the speaker 23, the radiating portion 25 has a second radiating element u, and the second radiating element u includes two separately disposed second sub-radiators 25m and 25N, and the second sub-radiators 25m and 25N are illustratively in a narrow strip-shaped configuration extending in opposite directions along the same straight line, such as the second sub-radiator 25m extends in the direction C, the second sub radiator 25n extends along the direction D, and the second sub radiator 25M and the second sub radiator 25n are exemplarily symmetrically arranged with respect to a plane M, which is perpendicular to the outer side surface of the front end wall 312 (i.e., the preset surface 90A); the feeding portion 21 has a positive feeding terminal 15am coupled (exemplarily coupled by a feeding line 21 am) to an end of the second sub-radiator 25m in the D direction, a positive feeding terminal 15an coupled (exemplarily coupled by a feeding line 21 an) to an end of the second sub-radiator 25n in the C direction, and a ground feeding terminal 15b coupled to a ground (exemplarily coupled to the second ground metal layer 19 in fig. 8 a), the radio frequency transceiver 13 feeds a positive signal to the power divider 29, the power divider 29 divides the positive signal from the radio frequency transceiver 13 into two signals of equal power, one of which is fed to the positive feeding terminal 15am via a positive signal line 14am, the other of which is fed to the positive feeding terminal 15an via a positive signal line 14an, and a negative signal emitted from the radio frequency transceiver 13 is fed to the positive feeding terminal 15an via a ground signal line 14b to the ground feed terminal 15 b; the orthographic projection of the radiation part 25 on the bottom surface of the groove structure of the ear 410 is a fifth area 431 ″ with the current I flowing in the C direction in the second sub-radiator 25m₃The second sub-radiator 25n has a current I flowing in the direction D₄Current I of₃Exciting an induced current I in a fifth region 431 ″₃', current I₄Exciting a current I in a fifth region 431 ″₄', induced current I₃' and the induced current I₄The two different directions are equal and opposite to each other, so as to cancel each other out, thereby achieving the purpose of reducing signal power loss and improving the communication quality between the wireless earplug 10 and the external wireless device 71.

It is to be noted that the above arrangement of the second sub-radiator 25M and the second sub-radiator 25n symmetrically with respect to the plane M is merely exemplary, for example, the lengths of the second sub-radiator 25m and the second sub-radiator 25n may not be equal to each other (for example, the ratio of the lengths of the second sub-radiator 25m and the second sub-radiator 25n is less than or equal to 1.3, such as 1.3, 1.2, 1.1, or 1), the signal powers distributed to the positive signal line 14am and the positive signal line 14an by the power divider 29 may not be equal to each other (for example, the ratio of the signal powers distributed to the positive signal line 14am and the positive signal line 14an by the power divider 29 is less than or equal to 1.3, such as 1.3, 1.2, 1.1, 1, or other values), as long as it can be ensured that the currents in the second sub-radiator 25m and the second sub-radiator 25n have components in opposite directions, so that the induced currents excited on the fifth region 431 ″ can cancel at least a part of each other. The power divider 29 may also be replaced by another device having a power distribution function, as long as the positive signals in the second sub-radiator 25m and the second sub-radiator 25n are synchronized.

Fig. 9B shows another schematic view of the radiating portion 25 in fig. 8a, when viewed from the front a to the back B of the wireless earplug 10, compared to fig. 9a, fig. 9B is different in that the radiating portion 25 further includes a second radiating element s having the same structure as the second radiating element u, and the second radiating element s and the second radiating element u are located in the same plane parallel or approximately parallel (for example, included angle of 0-30 °, specifically 0 °, 5 °, 10 °, 20 °, 30 ° or other angle) to the outer side surface (i.e. the preset surface 90A) of the front end wall 312, exemplarily, the extending direction of the second radiating element s is perpendicular to the extending direction of the second radiating element u, and the symmetric center of the second radiating element s coincides with the symmetric center of the second radiating element u, each second sub-radiator in the second radiating element s is also fed with a synchronous positive signal, therefore, the induced currents excited by the second radiation unit s at the bottom surface of the ear 410 can also cancel each other; similarly, the radiation portion 25 may further include more (e.g., 3, 4, 5 or more) second radiation units u having the same structure as the second radiation unit u, and each second radiation unit is parallel to the front end wall 312, an included angle of an extending direction of each second radiation unit u may be adjusted as required, and a direction of the second radiation unit u is also other directions as long as the second radiation unit u is parallel to the outer side surface (i.e., the preset surface 90A) of the front end surface 312.

In another specific embodiment, fig. 10A shows an exemplary schematic view of the wireless earplug 10 when the antenna 16 is disposed in the handle portion 320 of the wireless earplug 10, fig. 10B shows a partial enlarged view at R in fig. 10A, referring to fig. 10A and 10B, the handle portion 320 has a third circuit board 30 therein, one side of the third circuit board 30 faces the front surface a and the other side faces the back surface B, the side of the third circuit board 30 facing the plane of the predetermined surface 90A may be parallel to the plane of the outer side surface of the front end wall 312 (i.e., the predetermined surface 90A) or the outer side surface of the front end wall 312, and is disposed according to requirements, such as included angles of 0-30 °, specifically 0 °, 5 °, 15 °, 25 ° and 30 °, etc., fig. 10A is merely an exemplary illustration of the third circuit board 30 facing the plane of the predetermined surface 90A and parallel to the plane of the outer side surface of the front end wall 312, a third grounding metal layer 34 is arranged on one side of the third circuit board 30 facing the back surface B, the third grounding metal layer 34 may be formed by a conductive trace, a conductive film layer, a metal sheet, a metal foil or other conductive structure, and the region 27 on one side of the third grounding metal layer 34 facing the back surface B may be used for disposing the battery 17 and other components; antenna 16 includes a resonating element 40, resonating element 40 including a radiating portion 33 and a feed portion 31, wherein, the radiation portion 33 is disposed in the handle portion 320 and located on the side of the third circuit board 30 facing the front surface a, when the body portion 310 is worn in the ear 410, the outer side surface of the front end wall 312 serves as a preset surface 90A in contact with the bottom surface of the ear 410 of the user, the orthographic projection of the radiation portion 33 on the skin surface 440 of the face of the user is a sixth area 441, fig. 10c is a schematic view of an exemplary radiating portion 33 of fig. 10a, as viewed from the front a to the back B of the wireless earplug 10, the radiating portion 33 illustratively having a rectangular shape as shown in fig. 10c, and the side of the radiating portion 33 facing the plane of the predetermined surface 90A is exemplarily parallel to the plane of the outer side of the front end wall 312 (i.e. the predetermined surface), so that the side of radiation portion 33 facing the plane of predetermined surface 90A can be parallel to the surface of sixth region 441 as much as possible; feed 31 includes a positive feed terminal 15a coupled (illustratively by feed 31 a) to the center of rectangular symmetry of radiating portion 33 and a ground feed terminal 15b coupled to ground, radio-frequency transceiver 13 is coupled to positive feed terminal 15a by positive signal line 14a and to ground feed terminal 15b by ground signal line 14b, in fig. 10a, ground feed terminal 15b is illustratively coupled to a third ground metal layer 34 that is at least part of the ground of antenna 16 (ground feed terminal 15b may also be coupled to the metal skin of battery 17 as in region 27), third ground metal layer 34 may also be coupled to the metal skin of battery 17 or other metal structure within handle 310 that may be part of the ground of antenna 16; since the positive power feeding terminal 15a is coupled to the symmetrical center of the radiating portion 33, and when the main body portion 310 of the user is worn in the ear 410, the side of the radiating portion 33 facing the plane of the predetermined surface is parallel or approximately parallel to the surface of the sixth region 441, the induced currents excited in the sixth region 441 by the main body portion 310 can cancel each other out, so as to achieve the purposes of reducing the signal power loss and improving the communication quality between the wireless earplug 10 and the external wireless device 71.

It should be noted that fig. 10D is a schematic view of another exemplary radiation portion 33 observed from the front surface a to the back surface B of the wireless earplug 10 in fig. 10a, and when observed from the front surface a to the back surface B of the wireless earplug 10, the radiation portion 33 may also be an oval shape with the long axis extending along the C → D direction, a long and narrow structure extending along the C → D direction, or other central symmetrical pattern as shown in fig. 10D, and specific setting requirements of the shape of the radiation portion 33 and the like and the coupling position of the positive feed terminal 15a and the radiation portion 33 may refer to the requirements of the radiation portion 25 in the embodiment corresponding to fig. 4a to fig. 9B. Furthermore, it is also possible to dispose the components such as the battery 17 in the region 27 on the side of the third circuit board 30 facing the front surface a, and the radiation portion 33 on the side of the third circuit board 30 facing the back surface B; the radiating portion 33 may be provided separately from the handle portion 320, or may be provided along an inner sidewall of the handle portion 320.

Next, taking wearable device as a wrist band device as an example, the wrist band device refers to an electronic device that can be worn on the wrist of the user through a band, where the wrist band device may be a watch, a smart band, a phone that can be worn on the wrist, or other electronic devices that can be worn on the wrist of the user through a band.

Fig. 11a is a schematic diagram showing an exemplary internal structure of a wristband apparatus, and referring to fig. 11a, a wristband apparatus 50 includes a wristband 670 and a case, the case includes a surrounding wall 610, a display module 620, a transparent cover 630, a fourth circuit board 640, a battery 650 and a bottom cover 660, wherein the display module 620 is formed at a top (i.e. one end in the positive direction of the z-axis) port of the surrounding wall 610, the transparent cover 630 covers the top surface of the display module 620, the bottom cover 660 is mounted at a bottom (one end in the negative direction of the z-axis) port of the surrounding wall 610 to enclose the bottom port of the surrounding wall 620, the bottom cover 660 illustratively has an inner side (a side facing the display module 620) and an outer side (a side facing away from the display module 620) that are opposite to each other, in some cases, the inner side and the outer side of the bottom cover 660 may be parallel to each other, the fourth circuit board 640 is disposed in a space surrounded by the surrounding wall 610, the display module 620 and the bottom cover 660, and the plane of the fourth circuit board 640 facing the bottom cover 640 is exemplarily parallel to the inner side of the bottom cover 660, the battery 650 is disposed between the bottom cover 660 and the fourth circuit board 640; when the wrist band 670 is worn on the wrist 510 of the user, the outer side of the bottom cover 660 contacts with the skin surface of the wrist 610 as a predetermined surface (refer to reference numeral 90B in fig. 11 a); the material of the transparent cover plate 630 can be transparent materials such as glass, plastic and diamond; the material of the surrounding wall 620 may be a conductive material such as metal (gold, silver, copper, iron, aluminum, and the like) and alloy (such as aluminum alloy, stainless steel, and the like), or may be one of or a combination of at least two of insulating materials such as plastic, ceramic, wood, fiber, and polymer; the material of the bottom cover 660 may be one or a combination of at least two of insulating materials such as plastic, ceramic, wood, fiber, and polymer, or at least one of conductive materials such as metal and graphene, or a part made of the insulating material and a part made of the conductive material; the display module 620 may include, for example, a liquid crystal display, an OLED (organic light-Emitting Diode) display, a micro led display, or a miniLED display; in addition, it should be noted that the display module 620 is provided at the top port of the enclosure wall 610 only by way of example, and the display module 620 may be replaced with a pointer dial (such as when the wristband device 50 is a pointer watch), a touch pad (such as when the wristband device 50 is a smart bracelet), an opaque cover as part of the case (such as when the wristband device 50 is a smart bracelet without a display), or other cover parts that need to be provided, and in some cases, the cover parts including the opaque cover as part of the case may also be integral with the enclosure wall 610.

Fig. 12 shows a schematic diagram of the rf transceiver feeding to the antenna, please refer to fig. 12, the rf transceiver 53 is coupled to the antenna 52 through a transmission line 54, and the control unit 51 is configured to control the rf transceiver 53 to transceive the rf signal through the antenna 52, for example, the transmission line 54 includes a positive signal line 54a and a ground signal line 54b, the antenna 52 includes a resonant element and a ground portion, the resonant element includes a feeding portion and a radiating portion, the feeding portion has a positive feeding terminal 55a coupled to the radiating portion and a ground feeding terminal 55b coupled to the ground portion of the antenna 52, and the rf transceiver 53 is coupled to the positive feeding terminal 55a through the positive signal line 54a and is coupled to the ground feeding terminal 55b through the ground signal line 54 b.

Continuing back to fig. 11a, the rf transceiver 53 is exemplarily configured on the fourth circuit board 640, the bottom cover 610 is made of an insulating material, a radiation portion 661 is exemplarily formed on a side of the bottom cover 610 facing the fourth circuit board 640, wherein, as viewed along a negative direction of the z-axis, the radiation portion 661 can be rectangular as shown in fig. 11b, or can be an ellipse, a circle, a regular hexagon or other centrosymmetric pattern, the positive feed terminal 55a is coupled to a symmetric center of the radiation portion 661, the radiation portion 661 can be a conductive trace, a conductive film layer (such as a metal film layer and a graphene film layer), a metal foil or other conductive material, etc., and in fig. 11a, a surface of the fourth circuit board 640 facing the bottom cover 610 has a fourth grounding metal layer 641, the fourth grounding metal layer 641 can be a conductive trace, a conductive film layer, a metal sheet, a metal foil or other conductive structure, the fourth ground metal layer 641 and the metal skin of the battery 650 may both serve as at least a portion of the ground of the antenna 52, alternatively, the wall 610 may be a conductive material that also serves as at least a portion of the ground for the antenna 52, alternatively, other conductive material components within wall 610 may serve as at least part of the ground for antenna 52, the coupling of the ground feed terminal 55b to the metal skin of the battery 650 is merely exemplary in figure 11a, if necessary, the ground feeding terminal 55b may be shorted with the fourth ground metal layer 641, the metal sheet of the battery 650, the surrounding wall 610 made of a conductive material, or other conductive materials in the surrounding wall 610, and the ground feeding terminal 55b may be shorted with at least two of the fourth ground metal layer 641, the metal sheet of the battery 650, the surrounding wall 610 made of a conductive material, or other conductive materials in the surrounding wall 610 to jointly serve as the ground portion of the antenna 52. In addition, when the bottom cover 660 is made of an insulating material, the radiation portion 661 may be formed on a side of the bottom cover 660 facing the fourth circuit board 640 as shown in fig. 11a, and the radiation portion 661 may be disposed in a state of being separated from the bottom cover 660, that is, the radiation portion 661 is located in a cavity surrounded by the wall 610, the display module 620 and the bottom cover 660, or the radiation portion 661 may be formed on a side of the bottom cover 660 away from the fourth circuit board 640 (i.e., the predetermined surface 90B), or may be formed inside the bottom cover 660, and a thickness of the radiation portion 661 may be, for example, in a range from 0.35mm to 1.0mm, such as 0.35mm, 0.5mm, 0.75mm, 1.0mm or other thickness values; or, a partial area of the bottom cover 660 is made of a conductive material, and the rest is made of an insulating material, the portion made of the conductive material of the bottom cover 660 serves as the radiation portion of the antenna 52, and the positive feed terminal 15a is coupled with the symmetric center of the portion made of the conductive material of the bottom cover 660 for feeding, or, the bottom cover 660 is entirely made of a conductive material, and the bottom cover 660 is in a central symmetric pattern such as a circle or a rectangle, and the bottom cover 660 serves as the radiation portion of the antenna 52 as a whole, and the thickness of the bottom cover 660 is exemplarily 0.7mm to 1.2mm, and may be, for example, 0.7mm, 0.9mm, 1.0mm, 1.2mm, or other thickness values; and when the surrounding wall 610 is made of a conductive material and serves as a part of the ground of the antenna 52, the bottom cover 660 and the surrounding wall 610 may be electrically isolated from each other by providing an electrical isolation member made of an insulating material including a rubber ring between the bottom cover 660 and the surrounding wall 610, so as to prevent the radiating portion of the antenna 52 from being short-circuited to the ground. As long as it is ensured that the side surface of the radiation portion of the antenna 52 facing the preset surface 90B is parallel or approximately parallel (for example, the included angle is 0-30 °, specifically, 0 °, 5 °, 10 °, 20 °, 30 ° or other angles) to the plane where the side surface of the bottom cover 610 departing from the fourth circuit board 640 (i.e., the preset surface 90B) is located. Wherein the maximum size of the orthographic projection of the radiation part on the inner side surface of the bottom cover 610 (for example, when the bottom cover 610 is circular and the whole is the radiation part, the diameter of the bottom cover 610) ranges from 8mm to 45mm, and can be 8mm, 15mm, 20mm, 30mm, 45mm or other length values.

In the wristband device, since the radiation portion 661 is in a central symmetrical pattern, the positive feeding terminal 55a is coupled to the symmetrical center of the radiation portion 661, when the wristband 670 is worn on the wrist, the orthographic projection of the radiation portion 661 on the skin surface of the wrist 510 is the seventh area 531, and the induced currents excited by the currents in the radiation portion 661 on the surface of the seventh area 531 can cancel each other out, so as to reduce the signal power loss of the antenna 52 and improve the communication quality between the wristband device 50 and other wireless devices. It should be noted that, the setting requirements of the radiation portion 661, such as the shape of the radiation portion 661, can refer to the setting requirements of the radiation portion 25 in the embodiment when the wearable device is the wireless earplug 10, when the radiation portion 661 is in a non-centrosymmetric pattern, or the positive feed terminal 55a is coupled with a deviation from the symmetric center of the radiation portion 661, as long as the structure having the radiation portion 661 on the two opposite sides of the ground feed terminal 55a along at least one straight line on the plane where the radiation portion 661 is located can achieve the purpose of reducing the power loss, but the power loss may be larger than when the positive feed terminal 55a is coupled to the symmetric center of the radiation portion 661 in a centrosymmetric pattern.

In another embodiment, a detachable connection may be provided between the bottom cover 660 and the surrounding wall 610 to facilitate replacement of the battery 650 or maintenance, etc.; illustratively, an insulating layer (such as a rubber layer, a plastic layer or other insulating material layer) may be covered on the surface of the battery 650 facing the bottom cover 660, and a spring that extends and contracts in the z direction may be disposed on the surface of the insulating layer facing the bottom cover 660, and the positive signal line 54a may be coupled to the spring, and when the bottom cover 660 is re-installed to the bottom port of the peripheral wall 610, the positive power feeding terminal 55a on the radiation portion 661 compresses the spring, so that the spring is stably contacted with the radiation portion 661, and thus, the positive signal line 54a and the positive power feeding terminal 55a are automatically and stably coupled, and the bottom cover 660 can be always pressed due to the compression of the spring, thereby ensuring the stability of signal transmission.

Taking wearable devices as glasses including smart glasses, which can be used for communicating with other external wireless devices, as an example, fig. 13a exemplarily shows a schematic view when the glasses 80 are worn on the head 400 of a user, please refer to fig. 13a, the glasses 80 exemplarily includes a frame 712, a lens 720 mounted on the frame 712, and two legs 711 respectively connected to two sides of the frame and used for being attached to and fixed with the side of the head 400, the legs 711 of the glasses are mounted on the legs 711, and the surface of the legs 711 facing the head 400 is used as a preset surface to be in surface contact with the head 400; illustratively, an enlarged view of the internal structural schematic of the host section 730 is taken in the direction F in fig. 13a, as shown in fig. 13b, fig. 13c is a partial enlarged view of a portion T in fig. 13b, and referring to fig. 13b and 13c, the main body portion 730 includes a housing, and the glasses legs 711, the glasses frame 712 and the case of the host portion 730 are all provided as at least a part of the case of the glasses 80, wherein the housing includes a first side wall 731 and a second side wall 732 arranged oppositely along the G direction, when the eyeglasses 80 are worn on the head 400 of a user, the outer side surface 90C of the second side wall 732 facing away from the first side wall 731 is illustratively disposed parallel to the predetermined surface on the temple 711, and when the eyeglasses 80 are worn on the head 400 of a user, the outer side surface 90C of the first side wall 731 illustratively contacts the head 400 of the user, the outer side surface 90C of the first side wall 731 may not contact the head 400 of the user.

Fig. 14 shows a schematic diagram of the rf transceiver feeding the antenna, please refer to fig. 14, the rf transceiver 83 is coupled to the antenna 82 through a transmission line 84, and the control unit 81 is used for controlling the rf transceiver 83 to transmit and receive rf signals through the antenna 82, for example, the transmission line 84 includes a positive signal line 84a and a ground signal line 84b, the antenna 82 has a positive feeding terminal 88a coupled to the resonant element of the antenna 82 and a ground feeding terminal 88b coupled to the ground of the antenna 82, the rf transceiver 83 is coupled to the positive feeding terminal 88a through the positive signal line 84a and is coupled to the ground feeding terminal 88b through the ground signal line 84 b.

Continuing back to fig. 13b and 13c, in the G direction, a battery 735 and a fifth circuit board 733 are provided between the first and second side walls 731, 732, wherein the radio-frequency transceiver 82 is exemplarily located on the side of the fifth circuit board 733 facing the first side wall 731, the side of the fifth circuit board 733 facing the second side wall 732 has a fifth ground metal layer 734, the resonant element of the antenna 82 comprises a radiating portion 735 covering the inner side of the second side wall 732, and the second side wall 732 has opposite inner (the side of the second side wall 732 facing away from the user's head 400 in fig. 13 b) and outer (the side of the second side wall 732 facing toward the user's head 400 in fig. 13 b) sides, the inner and outer sides of the second side wall 732 are exemplarily parallel to each other, the radiating portion 735 is in a rectangular, circular, elliptical or other centrally symmetrical pattern, the positive feed terminal 85a is coupled to the symmetrical center of the radiating portion 735 through a feed line 736, the metal skin of the battery 735 and the fifth ground metal layer 734 may each at least serve as part of the ground for the antenna 82, with the ground feed terminal 85b illustratively coupled to the fifth ground metal layer 734. When the user wears the glasses 80 on the head 400, the orthographic projection of the radiation part 735 on the skin surface of the head 400 is an eighth area 401, and since the positive feed terminal 85a is coupled to the symmetric center of the radiation part 735, and the surface of the radiation part 735 facing the second side wall 732 is parallel to the surface of the eighth area 401, the induced currents excited by the currents in the radiation part 735 on the surface of the eighth area 401 can cancel each other out to achieve the purposes of reducing power loss and improving the radiation performance of the antenna 82.

It should be noted that the specific form of the antenna 82, such as the position and shape of the radiating portion 735, is not limited to the form described above, and the specific form of the antenna 82, such as the position and shape of the radiating portion 735, may be specifically referred to the aforementioned requirements regarding the placement of the antenna 16 in the embodiment of the wireless ear bud 10.

In addition, all the parts in the drawings of the embodiment of the application are only used for showing the working principle of the wearable device, and do not really reflect the actual size relationship of each part.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A wearable device, comprising: a housing and an antenna; wherein the content of the first and second substances,

the shell is provided with a preset surface extending along a plane direction, and the preset surface is a surface which is contacted with a user when the wearable device is worn on the user;

the antenna comprises a radiation part and a feed part which is positioned in the shell and used for coupling and feeding the radiation part, wherein the included angle between one surface of the radiation part close to the plane of the preset surface and the plane of the preset surface ranges from 0 degree to 30 degrees, and the radiation part at least comprises a radiation structure for flowing at least one pair of currents flowing to opposite directions along the same straight line direction.

2. The wearable device of claim 1, wherein the radiating structure comprises at least a symmetric structure.

3. The wearable device according to claim 1, wherein the radiating structure comprises at least one first radiating element in the shape of a straight line, the first radiating element comprising two first sub-radiators connected by an end;

the feed part and the first radiation unit are coupled and fed at the connection position of the two first sub-radiators.

4. The wearable device according to claim 3, wherein the two first sub-radiators have substantially equal lengths in one of the first radiating elements.

5. The wearable device according to claim 4, wherein the number of the first radiation units is multiple, and centers of the multiple first radiation units are located on a same straight line perpendicular to a plane where the preset surface is located.

6. The wearable device according to claim 5, wherein the plurality of first radiating elements are located in the same plane and are centered coincident.

7. The wearable device according to claim 3, wherein a length ratio of one first sub-radiator to another first sub-radiator in one first radiation unit is greater than or equal to 1 and less than or equal to 1.3.

8. The wearable device according to claim 2, wherein the radiating structure comprises at least one first radiating element in the shape of a straight line, the first radiating element comprising two first sub-radiators connected by an end;

9. The wearable device according to claim 8, wherein the two first sub-radiators have substantially equal lengths in one of the first radiating elements.

10. The wearable device according to claim 9, wherein the first radiating elements are multiple in number, and centers of the multiple first radiating elements are located on a same straight line perpendicular to a plane where the predetermined surface is located.

11. The wearable device according to claim 10, wherein the plurality of first radiating elements are located in a same plane and are centered coincident.

12. The wearable device according to claim 8, wherein a length ratio of one first sub-radiator to another first sub-radiator in one first radiation unit is greater than or equal to 1 and less than or equal to 1.3.

13. The wearable device according to claim 1, wherein the radiating structure comprises at least one first radiating element, and each first radiating element comprises two second sub-radiators arranged along a straight line and electrically isolated;

and the feed part is coupled with one end of each group of the first radiating units, which is adjacent to the two second sub-radiators.

14. The wearable device according to claim 13, wherein the number of the second sub-radiators is multiple, and the multiple second sub-radiators are arranged in a central symmetry manner.

15. The wearable device according to claim 2, wherein the radiating structure comprises at least one first radiating element, and each first radiating element comprises two second sub-radiators arranged along a straight line and electrically isolated;

16. The wearable device according to claim 15, wherein the number of the second sub radiators is multiple, and the multiple second sub radiators are arranged in a central symmetry manner.

17. The wearable device of claim 1, wherein the radiating structure is a circular, rectangular, or elliptical conductive sheet.

18. The wearable device of claim 2, wherein the radiating structure is a circular, rectangular, or elliptical conductive sheet.

19. The wearable device according to claim 1, wherein a side surface of the radiation portion close to the plane of the preset surface comprises a curved surface, and an included angle between a tangent plane of any point on the curved surface and the preset surface is in a range of 0-30 °.

20. The wearable device according to claim 2, wherein a side surface of the radiation portion close to the plane of the preset surface comprises a curved surface, and an included angle between a tangent plane of any point on the curved surface and the preset surface is in a range of 0-30 °.

21. The wearable device according to claim 1, wherein the feed portion comprises a positive feed terminal and a feed line connecting the radiating portion and the positive feed terminal, the feed line having a current path length greater than 0.01 λ and less than 0.125 λ;

the sum of the lengths of the current paths of the feeder line and one of the currents in the opposite directions on the radiation part is greater than or equal to 0.20 lambda and less than 0.25 lambda, wherein lambda is the conduction wavelength corresponding to the working frequency band of the antenna.

22. The wearable device according to claim 1, wherein the feeding portion is coupled to a feeding point on the radiating portion, and wherein a distance from the feeding point to an edge of the radiating portion is greater than or equal to 0.125 λ, where λ is a conductive wavelength corresponding to an operating frequency band of the antenna.

23. The wearable device according to claim 22, wherein the radiating portion has a centrosymmetric pattern, and a distance from the feed point to a center of symmetry of the radiating portion is equal to or less than 0.05 λ.

24. The wearable device according to any of claims 1-23, wherein the antenna further comprises a ground disposed opposite the radiating portion; wherein the content of the first and second substances,

the grounding part is fixedly connected with the shell;

the radiation part is positioned between the plane of the preset surface and the grounding part; or, the radiation part is positioned on one side of the grounding part departing from the plane of the preset surface.

25. The wearable device of claim 24, wherein the wearable device is a wireless ear bud, the wireless ear bud further comprising a speaker disposed within the housing, the speaker being located between the ground and the predetermined surface, and a horn of the speaker facing the predetermined surface;

the radiation part is positioned between the loudspeaker and the preset surface, or the radiation part is positioned on one side of the grounding part, which is deviated from the loudspeaker.

26. The wearable device of claim 25, wherein the housing comprises a body portion comprising a front end wall and a circumferential side wall connected to the front end wall; the speaker and the grounding part are both arranged in the main body part; wherein the front end wall comprises an inner side surface and an outer side surface which are opposite to each other; the radiation part is arranged on the inner side face or the outer side face of the front end wall, and the preset surface is the outer side face.

27. The wearable device according to claim 26, wherein an inner or outer side of the circumferential side wall is provided with an extended radiation arm coupled with the radiation portion;

alternatively, at least a part of the structure of the circumferential side wall is made of a conductive material, and the part of the circumferential side wall made of the conductive material is coupled with the radiation part.

28. The wearable device according to claim 27, wherein a projection of the extended radiating arm on the circumferential sidewall overlaps a portion of a projection of the ground portion on the circumferential sidewall;

or, at least part of the structure of the circumferential side wall is made of a conductive material, and a projection of the structure made of the conductive material in the circumferential side wall on the circumferential side wall is overlapped with a part of a projection of the grounding portion on the circumferential side wall.

29. The wearable device according to claim 25, wherein the radiating portion has a thickness in a range of 0.35mm to 1.0 mm.

30. The wearable device according to claim 26, wherein a maximum dimension of an orthographic projection of the radiating portion on the front end wall is in a range of 5mm to 13 mm.

31. The wearable device according to any of claims 25-30, wherein a metal structure in the speaker is at least part of the ground.

32. The wearable device of claim 24, wherein the wearable device is a wireless ear bud, the housing comprising a body portion and a handle portion, the handle portion being connected to the body portion, wherein the body portion has the predetermined surface;

the ground portion and the radiating portion are both disposed within the handle.

33. The wearable device of claim 24, wherein the wearable device is a wrist band device, the housing comprises a bottom cover and an enclosure wall, the bottom cover is formed at a bottom port of the enclosure wall, the bottom cover has an inner side and an outer side opposite to each other, and the predetermined surface is the outer side;

the radiation part is formed in the inner cavity of the shell, or the radiation part is formed on the inner side surface, the outer side surface of the bottom cover or inside the bottom cover, or at least part of the structure of the bottom cover is made of a conductive material and the part of the bottom cover made of the conductive material is used as the radiation part.

34. The wearable device according to claim 33, wherein the surrounding wall is made of a conductive material and serves as at least a part of the grounding portion, and the bottom cover is entirely made of a conductive material and serves as the radiation portion, and an electrical isolation member is provided between the surrounding wall and the bottom cover.

35. The wearable device of claim 33, wherein when the radiating portion is formed in the housing interior cavity, or the radiating portion is formed on an inner side, an outer side, or an interior of the bottom cover, the radiating portion has a thickness in a range of 0.35mm to 1.0 mm;

when at least part of the structure of the bottom cover is made of a conductive material, and the part of the bottom cover made of the conductive material is used as the radiation part, the thickness of the bottom cover ranges from 0.7mm to 1.2 mm.

36. The wearable device of claim 33, wherein the maximum dimension of the orthographic projection of the radiating portion on the inner side of the bottom cover is in a range of 8mm to 45 mm.

37. The wearable device according to claim 24, wherein the wearable device is eyeglasses, the housing comprises temples, and the predetermined surface is a surface of the temples for contacting a user's head.