Antenna structure and smart wearable device

Abstract

The application discloses an antenna structure and a smart wearable device, and belongs to the technical field of communication. The antenna structure is arranged in the smart wearable device and comprises a first antenna unit and a second antenna unit which are arranged in a ring shape. A first end of the first antenna unit is connected with a first feeding end. When the first antenna unit is excited to generate an antenna radiation direction by feeding the first feeding end, the antenna radiation direction is directed to a first direction. A first end of the second antenna unit is connected with a second feeding end. When the second antenna unit is excited to generate an antenna radiation direction by feeding the second feeding end, the antenna radiation direction is directed to a second direction. A second end of the first antenna unit is adjacent to the first end of the second antenna unit, and a second end of the second antenna unit is adjacent to the first end of the first antenna unit. When the first feeding end and the second feeding end are simultaneously fed, the first antenna unit and the second antenna unit are excited to generate an antenna radiation direction which is directed to a third direction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of communication, and particularly relates to an antenna structure and a smart wearable device. BACKGROUND

[0002] At present, the radiation direction of the antenna arranged on a smart wearable device, such as a smart watch, a smart bracelet and the like, is unchanged relative to the wearing position coordinate system of the smart wearable device. The fixed antenna radiation direction causes the signal range received by the antenna to be limited, the received signal quality to be poor, and the user experience to be affected. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide an antenna structure and a smart wearable device, which can solve the problem of poor signal quality received by the antenna of the smart wearable device.

[0004] In a first aspect, the embodiments of the present application provide an antenna structure arranged in a smart wearable device, comprising: a first antenna unit and a second antenna unit arranged in a surrounding manner, a first end of the first antenna unit being connected with a first feeding end, the antenna radiation direction excited by the first antenna unit when fed at the first feeding end being towards a first direction; a first end of the second antenna unit being connected with a second feeding end, the antenna radiation direction excited by the second antenna unit when fed at the second feeding end being towards a second direction; a second end of the first antenna unit being adjacent to the first end of the second antenna unit, and a second end of the second antenna unit being adjacent to the first end of the first antenna unit, and the antenna radiation direction excited by the first antenna unit and the second antenna unit when simultaneously fed at the first feeding end and the second feeding end being towards a third direction.

[0005] In a second aspect, the embodiments of the present application provide a smart wearable device, comprising the antenna structure as described in the first aspect.

[0006] In the embodiments of the present application, by arranging the antenna structure of the antenna unit pair arranged in a surrounding manner in the smart wearable device, each antenna unit can be excited to generate the antenna radiation direction towards different directions when fed alone and simultaneously, the antenna radiation direction is changed relative to the wearing position coordinate system of the smart wearable device, the signal range received by the antenna is wider, and thus the signal quality received by the antenna of the smart wearable device is improved, and more accurate antenna signal information is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a schematic diagram of the antenna structure of the embodiments of the present application.

[0008] Figure 2 is a current schematic diagram of the antenna unit of the embodiments of the present application.

[0009] Figure 3a is an antenna pattern of the antenna structure of the first embodiment of the present application.

[0010] Figure 3b is an antenna pattern of the antenna structure of the second embodiment of the present application.

[0011] Figure 3c is an antenna pattern of the antenna structure of the third embodiment of the present application.

[0012] Figure 4a is a schematic diagram of the antenna radiation direction of the antenna structure of the first embodiment of the present application.

[0013] Figure 4b is a schematic diagram of the antenna radiation direction of the antenna structure of the second embodiment of the present application.

[0014] Figure 5 is a schematic diagram of the antenna structure of another embodiment of the present application.

[0015] Figure 6 is a schematic diagram of the current distribution corresponding to different phases of the antenna structure of the present application.

[0016] Figure 7 is a circuit diagram of the antenna structure of the embodiment of the present application.

[0017] Figure 8 is a schematic diagram of the antenna structure of yet another embodiment of the present application.

[0018] Figure 9 is a schematic diagram of the position of the antenna structure of the embodiment of the present application.

[0019] Figure 10a and Figure 10b are schematic diagrams of the structure of the smart wearable device of the embodiments of the present application, respectively. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0021] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the front and rear associated objects are in an "or" relationship.

[0022] The antenna structure and the intelligent wearable device provided by the embodiments of the present application will be described in detail below in combination with the drawings, through specific embodiments and application scenarios.

[0023] The antenna structure of the embodiments of the present application is arranged in an intelligent wearable device, and the antenna structure comprises: a first antenna unit and a second antenna unit arranged around, a first end of the first antenna unit is connected with a first feeding end, and an antenna radiation direction excited by the first antenna unit when fed at the first feeding end is directed to a first direction; a first end of the second antenna unit is connected with a second feeding end, and an antenna radiation direction excited by the second antenna unit when fed at the second feeding end is directed to a second direction; a second end of the first antenna unit is adjacent to the first end of the second antenna unit, and a second end of the second antenna unit is adjacent to the first end of the first antenna unit, and an antenna radiation direction excited by the first antenna unit and the second antenna unit when fed at the first feeding end and the second feeding end at the same time is directed to a third direction.

[0024] The intelligent wearable device is, for example, a mobile electronic device such as a smart bracelet, a smart watch, etc. The antenna structure is arranged on the intelligent wearable device, and is used for transmitting and receiving signals to provide corresponding services for the intelligent wearable device, for example, the antenna structure is used as an antenna for mobile calls, satellite navigation or WiFi, etc.

[0025] The first antenna unit and the second antenna unit are respectively connected with a feeding end, and each antenna unit can be excited to produce an antenna radiation direction directed to different directions when fed alone and simultaneously fed. The radiation direction of the antenna is changed relative to the wearing position coordinate system of the intelligent wearable device, and the signal range received by the antenna is wider, thereby improving the quality of the signal received by the antenna of the intelligent wearable device and obtaining more accurate antenna signal information.

[0026] Optionally, the first antenna unit is a bent stub structure, and the first antenna unit and the second antenna unit are arranged in a central symmetry.

[0027] One end of the first antenna element is connected to the first feed terminal, and the first antenna element can be excited to generate circularly polarized radiation when fed by the first feed terminal. One end of the second antenna element is connected to the second feed terminal, and the second antenna element can be excited to generate circularly polarized radiation when fed by the second feed terminal. The first antenna element and the second antenna element are centrally symmetrically arranged. They are excited to generate circularly polarized radiation when fed by both the first feed terminal and the second feed terminal simultaneously. By feeding at least one of the first feed terminal and the second feed terminal, the antenna structure can be excited to generate antenna radiation in different directions, and the maximum antenna radiation direction generated by the excited antenna structure is perpendicular to the ground and upward. The antenna structure includes a centrally symmetrical and independently arranged first antenna element and second antenna element. Each antenna element is a stub structure, and one end of the stub structure of each antenna element is connected to the corresponding feed terminal, so that when the feed terminal is turned on, the corresponding antenna element can be excited to generate antenna radiation in the target direction.

[0028] In this embodiment, the stub structure of a single antenna element can be excited to generate circularly polarized radiation when fed, and the first and second antenna elements can be excited to generate circularly polarized radiation when fed simultaneously. The stub structure includes, for example, a vertically bent stub structure or a circularly bent stub structure, and the stub structure satisfies the condition for circular polarization. If a single antenna element can be formed by a stub structure consisting of a first stub and a second stub, then the current amplitudes at the center points of the first and second stubs are the same and their phases differ by 90 degrees, thus satisfying the condition for circular polarization. Therefore, when the feed terminal connected to this antenna element is fed, it can be excited to generate circularly polarized radiation.

[0029] like Figure 1 As shown, the antenna structure 100 includes a first antenna element 10 corresponding to stub abc, and a second antenna element 20 corresponding to stub def. Stubs abc and def are centrally symmetrically arranged. The first antenna element starts at point a on stub abc and ends at point c on stub abc; the second antenna element starts at point d on stub def and ends at point e on stub def. Starts a and d are connected to different feed terminals, and the end c of the first antenna element is adjacent to the start d of the second antenna element, while the end f of the second antenna element is adjacent to the start a of the first antenna element.

[0030] In one embodiment, optionally, the first antenna element includes a first stub and a second stub, the first end of the first stub is connected to the first feed terminal, the second stub is connected to the second end of the first stub, and when the first feed terminal is fed, the current amplitudes at the center point of the first stub and the center point of the second stub are the same and the phase difference is 90 degrees.

[0031] The second antenna unit comprises a third branch and a fourth branch, the first end of the third branch is connected with the second feeding end, and the second end of the third branch is connected with the fourth branch; when the second feeding end is fed, the current amplitudes of the center points of the third branch and the fourth branch are the same, and the phases are different by 90 degrees.

[0032] The two branches of each antenna unit arranged around in the above embodiment have predetermined electrical lengths and form a bent branch structure, for example, an arc bending in a circular ring shape or a vertical bending in a linear segment shape. When the corresponding feeding end is fed, the current amplitudes of the center points of the two vertical branches of the single antenna unit are the same, and the phases are different by 90 degrees. The electrical lengths and the bending shapes of the two branches can be determined by experiments, and the circular polarization condition is met.

[0033] Optionally, the electrical length of the first antenna unit and the electrical length of the second antenna unit D are one working wavelength. It should be noted that here is not a strict one working wavelength in a narrow sense.

[0034] That is, the sum of the electrical lengths of the two branches of each antenna unit needs to be about one working wavelength λ. Under the premise that the sum of the electrical lengths of the two branches is one λ, the electrical lengths and the bending shapes of the two branches meet the circular polarization condition.

[0035] Optionally, the first branch and the second branch are perpendicular; or the third branch and the fourth branch are perpendicular.

[0036] The two branches of each antenna unit in this embodiment are perpendicular, and can form a vertical bent branch structure.

[0037] Reference Figure 1 The bent branch abc of the first antenna unit 10 comprises a branch ab and a branch bc, wherein the branch ab and the branch bc are perpendicular; the bent branch dfe of the second antenna unit 20 comprises a branch de and a branch ef, wherein the branch de and the branch ef are perpendicular.

[0038] When the corresponding feeding end is fed, the current amplitudes of the center points of the two vertical branches of the single antenna unit need to be the same, and the phases are different by 90 degrees. The electrical lengths and the bending shapes of the two branches can be determined by experiments, and the circular polarization condition is met.

[0039] When the first antenna unit 10 is fed through the feeding end connected with the opening end a, the current amplitudes of the center point g of the branch ab and the center point h of the branch bc of the first antenna unit 10 are the same, and the phases are different by 90°. In this way, the single first antenna unit with the above bent branch structure meets the basic condition of circularly polarized radiation.

[0040] As Figure 2 shown in the current simulation diagram of the first antenna unit 10, the current amplitudes of the two center points g, h of the bent branch abc are approximate.

[0041] Similarly, a single second antenna unit 20 which is center-symmetric with the first antenna unit 10 can meet the basic condition of circularly polarized radiation.

[0042] The bent branch of the single antenna unit of this embodiment is two vertical line segment branches ab and bc, the two line segment branches are asymmetric, the center point g of branch ab and the center point h of branch bc are connected by a dashed line inward, and the intersection point O of the center points is taken as the reference, and the direction perpendicular to the entire antenna unit is defined as the normal direction of the antenna. After the electromagnetic waves on branches ab and bc are superimposed by vectors, the maximum radiation direction of the antenna is offset from the normal direction of the antenna.

[0043] The following refers to the antenna patterns of the antenna structure of the embodiment of Figures 3a to 3c , wherein Figure 3a is the first feeding end fed only by the first antenna unit, Figure 3b is the second feeding end fed only by the second antenna unit, Figure 3c is the simulation antenna pattern corresponding to the first feeding end connected by the first antenna unit and the second feeding end connected by the second antenna unit at the same time.

[0044] At least one of the first feeding end and the second feeding end is triggered by the smart wearable device in different motion postures, so that the feeding end of the feeding can excite the antenna radiation direction of the antenna structure to be oriented towards the target direction when the smart wearable device is in different motion postures. At the same time, in the case of the center-symmetric bent branch structure of the first antenna unit 10 and the second antenna unit 20, the feeding end of the feeding can excite the maximum radiation direction of the antenna structure to be perpendicular to the ground and upward.

[0045] As can be seen from Figure 3a and Figure 3b , when only one feeding end is fed, the maximum radiation direction of the antenna is offset from the normal direction of the antenna. This offset can achieve the requirement that the maximum radiation direction of the antenna is still perpendicular to the ground and upward when the smart wearable device is in different motion postures, for example, when the arm wearing the smart wearable device swings. When the two feeding ends are fed at the same time, the two antenna units are center-symmetric, so the maximum radiation direction of the antenna is the normal direction of the antenna.

[0046] As can be seen from the change of the maximum radiation direction of the pattern, the relationship between the feeding end and the motion posture of the smart wearable device can be as follows:

[0047] 1) When the smart wearable device is in the upswing posture, the normal direction of the antenna is inclined to +θ, the feeding end connected with the first antenna unit is fed, and the antenna radiation direction generated by the antenna structure is inclined to the right when the first antenna unit is excited, and the maximum radiation direction L of the antenna can be perpendicular to the ground, as shown in Figure 3a ;

[0048] 2) When the smart wearable device is in the horizontal posture, the feeding end connected with the first antenna unit and the feeding end connected with the second antenna unit are simultaneously fed, the antenna radiation direction generated by the antenna structure is directly upward, and the normal direction of the antenna is the maximum radiation direction L and is perpendicular to the ground, as shown in Figure 3c .

[0049] 3) When the smart wearable device is in the downswing posture, the normal direction of the antenna is inclined to -θ, the feeding end connected with the second antenna unit is fed, and the antenna radiation direction generated by the antenna structure is inclined to the left when the second antenna unit is excited, and the maximum radiation direction L of the antenna can be perpendicular to the ground, as shown in Figure 3b .

[0050] When the user of the smart wearable device is in a motion posture, so that the smart wearable device is in the upswing and downswing motion posture, the normal direction of the antenna will form a certain angle with the ground, and the antenna radiation direction generated by the antenna structure is directed to the target direction. Figure 4a The figure is a schematic diagram of the smart wearable device in the upswing posture. If only the feeding end of the first antenna unit, for example Figure 4a and Figure 4b antenna unit 10 is fed, the main radiation direction Z' of the antenna can be just deflected to be perpendicular to the ground. As shown in the coordinate axes in Figure 4a , the Z axis is the direction perpendicular to the surface of the smart wearable device, and when only the antenna unit 10 is excited, the main radiation direction Z' of the antenna can still be perpendicular to the ground upward.

[0051] Similarly, when the smart wearable device is in the downswing posture, if only the feeding end of the second antenna unit, for example Figure 4a and Figure 4b antenna unit 20 is fed, when only the antenna unit 20 is excited, the maximum radiation direction Z' of the antenna can still be perpendicular to the ground upward.

[0052] Figure 4b The figure is a schematic diagram of the user of the smart wearable device in a motion posture, so that the smart wearable device is in the horizontal posture. When the smart wearable device is in the horizontal position, the feeding end connected with the antenna unit 10 and the feeding end connected with the antenna unit 20 are simultaneously fed, and the maximum radiation direction of the antenna is perpendicular to the surface of the smart wearable device and is also perpendicular to the ground upward.

[0053] When the direction of the current flowing through the stub of the antenna element is different, the type of circularly polarized radiation generated by the corresponding excitation of the antenna structure will also be different.

[0054] For example, a current extending counterclockwise from the first end of the first antenna element 10 to the second end of the first antenna element 10 can be excited to generate right-hand circularly polarized radiation when both the first and second feed ends are simultaneously fed; or

[0055] The current extends clockwise from the first end of the second antenna unit 20 to the second end of the second antenna unit 20, and can be excited to generate left-hand circularly polarized radiation when the first feed end and the second feed end are fed at the same time.

[0056] like Figure 5 As shown, in one embodiment, for example Figure 1 The antenna structure shown has a first antenna element 10 extending from the beginning a to the end c, with the beginning a of the first antenna element 10 connected to the feed terminal 1.

[0057] Correspondingly, the second antenna unit 20 extends from the beginning d to the end f, and the beginning d of the second antenna unit 20 is connected to the power supply terminal 2.

[0058] As mentioned above, when the feed terminals connected to the first antenna element and the second antenna element are simultaneously fed, the antenna structure can be excited to generate circularly polarized radiation. To further improve the circular polarization purity of the antenna, the following can be achieved through phase control: Figure 6 The current distribution is shown.

[0059] refer to Figure 6 When the feed terminals connected to the first antenna element 10 and the second antenna element 20 are simultaneously fed, if the currents (marked by arrows on the outside of the antenna structure in the diagram) on the stubs abc of the first antenna element 10 and def of the second antenna element 20 are in the same direction, the antenna structure will be excited into two modes: one along the vertical direction (corresponding to phase θ = 90°) and the other along the horizontal direction (corresponding to phases θ = 0° and θ = 180°). The current amplitudes of these two modes are equal, their phases are orthogonal, and they are superimposed at the center point of the two antenna elements. The arrow at the center of the antenna structure represents the direction of rotation of the combined vector after the superposition of the two current vectors.

[0060] Figure 6 Each current distribution diagram represents the current change on the surface of the antenna structure at the current phase θ. As the phase changes, the direction of the composite vector rotates counterclockwise, which conforms to the right-hand screw rule. Therefore, the polarization of the antenna structure is right-hand circular polarization.

[0061] Similarly, as Figure 5As shown, in another embodiment, the first antenna element extends from the beginning c to the end a, and the beginning c of the first antenna element is connected to the feed end 1'.

[0062] Correspondingly, the second antenna unit extends from the beginning f to the end d, and the beginning f of the second antenna unit is connected to the feed terminal 2'.

[0063] In the antenna structure of this embodiment, when the feed terminal connected to the first antenna element and the feed terminal connected to the second antenna element are simultaneously fed, then... Figure 6 Conversely, under the current phase θ, the change in current on the surface of the antenna structure changes with the phase, and the direction of the corresponding resultant vector rotates clockwise, which conforms to the left-handed screw rule. Therefore, the polarization of this antenna structure is left-handed circular polarization.

[0064] Currently, navigation antenna polarization methods, such as the Global Positioning System (GPS) using right-hand circular polarization and the BeiDou Navigation Satellite System's B1L band using left-hand circular polarization, can be achieved by switching between left-hand and right-hand circular polarization when the antenna is used to receive different navigation signals.

[0065] like Figure 5 As shown, when feed terminals 1' and 2' are grounded, and feed terminals 1 and 2' are powered, the rotation direction of the current synthesis vector corresponding to the antenna structure is counterclockwise, and the antenna structure radiates a right-hand circularly polarized wave. When feed terminals 1 and 2 are grounded, and feed terminals 1' and 2' are powered, the rotation direction of the current synthesis vector corresponding to the antenna structure changes to clockwise, and the antenna radiates a left-hand circularly polarized wave. Therefore, the left-hand and right-hand circularly polarized wave changes of the antenna structure excitation can be achieved by switching the feed ports.

[0066] To ensure that the current phases from feed terminal 1 and feed terminal 2 to the corresponding antenna element are the same, or that the current phases from feed terminal 1' and feed terminal 2' to the corresponding antenna element are the same, the phase of the antenna element can be controlled by a phase shifter, or a metal wire of a predetermined length can be provided between the feed terminal and the beginning of the corresponding connected antenna element.

[0067] Optionally, the first end of the first antenna element is connected to the first feed end via a metal wire; or the first end of the second antenna element is connected to the second feed end via a metal wire; wherein, when the first feed end and the second feed end are fed simultaneously, the current phase from the first feed end to the first antenna element is the same as the current phase from the second feed end to the second antenna element.

[0068] Phase is generated by a metal wire of predetermined length, such that the current phase from the feed terminal connected to the first antenna element to the first antenna element is the same as the current phase from the feed terminal connected to the second antenna element to the second antenna element.

[0069] Alternatively, the first end of the first antenna unit is connected to the first feeding end through a phase shifter, or the first end of the second antenna unit is connected to the second feeding end through a phase shifter; wherein when the first feeding end and the second feeding end are fed at the same time, the current phase from the first feeding end to the first antenna unit is the same as the current phase from the second feeding end to the second antenna unit.

[0070] As shown in FIG. 1, the left side of the smart wearable device is provided with an antenna structure. By setting a phase shifter 30 between the antenna unit 20 and the feeding end 2, the current phase from the feeding end 2 to the antenna unit 20 can be adjusted to be the same as the current phase from the feeding end 1 to the antenna unit 19. Of course, a phase shifter can also be set between the antenna unit 10 and the feeding end 1, or phase shifters can be set between the antenna unit 20 and the feeding end 2 and between the antenna unit 10 and the feeding end 1 at the same time. Figure 7 When the antenna structure is provided on the right side of the smart wearable device, a phase shifter 30' can be set between the open end of the antenna unit connected to the feeding end 2' and the feeding end 2', or a phase shifter (not shown in the figure) can be set between the open end of another antenna unit connected to the feeding end 1' and the feeding end 1'.

[0071] In an embodiment, the first antenna unit and the second antenna unit are multiple, respectively. The first end of the first antenna unit close to the first feeding end is connected to the first feeding end, and the first end of the first antenna unit away from the first feeding end is connected to the second end of the adjacent previous first antenna unit. The first end of the second antenna unit close to the second feeding end is connected to the second feeding end, and the first end of the second antenna unit away from the second feeding end is connected to the second end of the adjacent previous second antenna unit.

[0072] As shown in FIG. 2, one first antenna unit and one second antenna unit form an antenna structure 100, and multiple first antenna units and multiple second antenna units form multiple antenna structures 100, which form an antenna array 200 as a whole. The antenna units in the antenna structure close to the feeding end are connected to the feeding end, and the other antenna units away from the feeding end are connected end to end, so that when the feeding end is fed, the antenna structures corresponding to the multiple first antenna units can be excited to generate antenna radiation direction towards one direction, or the antenna structures corresponding to the multiple second antenna units can be excited to generate antenna radiation direction towards another direction, or the entire antenna array 200 can be excited to generate different antenna radiation directions.

[0073] Figure 8 As shown in FIG. 2, one first antenna unit and one second antenna unit form an antenna structure 100, and multiple first antenna units and multiple second antenna units form multiple antenna structures 100, which form an antenna array 200 as a whole. The antenna units in the antenna structure close to the feeding end are connected to the feeding end, and the other antenna units away from the feeding end are connected end to end, so that when the feeding end is fed, the antenna structures corresponding to the multiple first antenna units can be excited to generate antenna radiation direction towards one direction, or the antenna structures corresponding to the multiple second antenna units can be excited to generate antenna radiation direction towards another direction, or the entire antenna array 200 can be excited to generate different antenna radiation directions.​

[0074] In this embodiment, by setting an antenna structure with a pair of antenna elements arranged in a ring in a smart wearable device, each antenna element can be excited to generate antenna radiation directions in different directions when individually fed or simultaneously fed. The radiation direction of the antenna changes relative to the coordinate system of the wearing position of the smart wearable device, and the signal range received by the antenna is wider, thereby improving the quality of the antenna received by the smart wearable device and obtaining more accurate antenna signal information.

[0075] For example, when smart wearable devices need to obtain navigation satellite signals, the location information obtained is more accurate.

[0076] This application also provides an intelligent wearable device, including the above-mentioned... Figures 1 to 8 The antenna structure described in any embodiment.

[0077] For example, smart wearable devices include smart wristband devices with smart dials and wristbands.

[0078] Optionally, the antenna structure is disposed at at least one preset position on the wristband of the smart wearable device, the preset position being adjacent to the smart watch face connected to the wristband.

[0079] The preset position near the smart watch face refers to the position where the wristband is close to the smart watch face and less than or equal to the preset distance.

[0080] like Figure 7 As shown, antenna structures, namely antenna unit 10 and antenna unit 20, are distributed on both sides of the smart wearable device wristband. Each feed terminal is located inside the smart dial. The side of the antenna structure closest to the smart wearable device is connected to the smart dial for power supply.

[0081] like Figure 8 As shown, multiple antenna structures 100 are distributed on both sides of the wristband of the smart wearable device. Among them, antenna 300 is the built-in antenna of the smart wearable device. Antenna 300 is connected to the feed terminal 301. Antenna 300 can be a GSM900, satellite navigation, or WiFi antenna. During normal use, the switch 40 is turned off via the control port, and antenna 300 is in normal working condition. When the smart wearable device is in motion, the switch 40 is turned on and off to feed the antenna structure 100. This maintains the original function of the antenna 300 inside the smart wearable device without affecting it, and at the same time, the antenna structure 100 can work when the switch 40 is on.

[0082] When the antenna structure is set on the wristband of a smart wearable device, such as Figure 9As shown, the antenna structure can be built in the wristband internal position 50. Based on different materials of the wristband, the wristband internal side 60 can be made of flexible printed circuit (FPC) or other metal structure. In this way, not only the back radiation can be reduced, but also the influence on the wrist is small, and the electromagnetic wave absorption ratio (SAR) problem caused by the antenna on the wristband can be reduced. In addition, the antenna structure arranged on the wristband can solve the problem of insufficient design space of the smart wearable device.

[0083] Optionally, the antenna structure is arranged on the smart watch face of the smart wearable device and is adjacent to the built-in antenna of the smart watch face to couple and feed.

[0084] Reference Figure 10a and 10b , Figure 10a is a front view of the smart watch face 70 of the smart wearable device, Figure 10b is a side view of the smart watch face 70. As shown, the bent branch abc and the branch def of the antenna unit constituting the antenna structure 100 are arranged on the smart watch face 70 of the smart wearable device, the feeding end is arranged on the printed circuit board (PCB) inside the smart watch face 70, and the antenna structure 100 is close to the antenna 300 arranged inside the smart watch face 70, so that the feeding and coupling feeding with the built-in antenna 300 can be realized at the same time.

[0085] In addition, the antenna structure can also be arranged on the crown of the smart wearable device.

[0086] Optionally, the smart wearable device comprises a detection unit and a control unit. The detection unit is used to detect the motion posture of the smart wearable device in the wearing state. The control unit is connected with the detection unit and is used to control at least one of the first feeding end and the second feeding end to feed according to the motion posture of the smart wearable device.

[0087] The detection unit can be a posture detection sensor, for example, comprising a gyroscope, which detects the motion posture of the smart wearable device in the wearing state through the gyroscope.

[0088] Optionally, the motion posture comprises an upswing posture, a downswing posture and a horizontal posture of the smart wearable device. When the smart wearable device is in the upswing posture or the downswing posture, the control unit controls the feeding end corresponding to the antenna unit farther away from the ground in the first antenna unit and the second antenna unit to feed. When the smart wearable device is in the horizontal posture, the control unit controls the first feeding end and the second feeding end to feed at the same time.

[0089] The smart wearable device is in the up-swing posture, the down-swing posture or the horizontal posture by the gyroscope, so that the corresponding antenna unit is fed by the switch to feed the feeding end, so that the antenna radiation direction of the antenna structure is directed to the target direction, and the maximum radiation direction of the antenna is always perpendicular to the ground.

[0090] As described above Figures 3a to 3c When the smart wearable device is in the up-swing posture, the first antenna unit is connected to the feeding end, and the antenna radiation direction of the antenna structure is directed to the first direction when the first antenna unit is excited, and the maximum radiation direction can be perpendicular to the ground; when the smart wearable device is in the down-swing posture, the second antenna unit is connected to the feeding end, and the antenna radiation direction of the antenna structure is directed to the second direction when the second antenna unit is excited, and the maximum radiation direction can be perpendicular to the ground; when the smart wearable device is in the horizontal posture, the feeding end connected to the first antenna unit and the feeding end connected to the second antenna unit are simultaneously fed, and the antenna radiation direction of the antenna structure is directed to the third direction at this time, and the maximum radiation direction is perpendicular to the ground.

[0091] Here, the first antenna unit is the antenna unit farther away from the ground among the first antenna unit and the second antenna unit when the smart wearable device is in the up-swing posture; correspondingly, the second antenna unit is the antenna unit farther away from the ground among the first antenna unit and the second antenna unit when the smart wearable device is in the down-swing posture.

[0092] Therefore, it can be ensured that the user wearing the smart wearable device is in different application scenarios, the maximum radiation direction of the antenna structure is always perpendicular to the ground upward, the antenna structure is aligned with the transmitting end of the signal transmitting device, the antenna function is not affected, and the user's use experience is enhanced.

[0093] It should be noted that in this paper, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0094] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative, not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. An antenna structure, characterized by The antenna structure is arranged in a smart wearable device, and the antenna structure comprises a first antenna unit and a second antenna unit arranged in a surrounding manner, a first end of the first antenna unit is connected with a first feeding end, and an antenna radiation direction generated by the first antenna unit when being excited by the first feeding end is towards a first direction; a first end of the second antenna unit is connected with a second feeding end, and an antenna radiation direction generated by the second antenna unit when being excited by the second feeding end is towards a second direction; a second end of the first antenna unit is adjacent to a first end of the second antenna unit, a second end of the second antenna unit is adjacent to a first end of the first antenna unit, and an antenna radiation direction generated by the first antenna unit and the second antenna unit when being excited by the first feeding end and the second feeding end simultaneously is towards a third direction; the first antenna unit is a bent branch structure, and the first antenna unit and the second antenna unit are arranged in a central symmetry manner; the first antenna unit comprises a first branch and a second branch, a first end of the first branch is connected with the first feeding end, and a second end of the first branch is connected with the second branch, and when the first feeding end is fed, a current amplitude of a center point of the first branch and a center point of the second branch is same and a phase difference is 90 degrees; the second antenna unit comprises a third branch and a fourth branch, a first end of the third branch is connected with the second feeding end, and a second end of the third branch is connected with the fourth branch, and when the second feeding end is fed, a current amplitude of a center point of the third branch and a center point of the fourth branch is same and a phase difference is 90 degrees; an electric length of the first antenna unit and an electric length of the second antenna unit are one working wavelength.

2. The antenna structure according to claim 1, wherein the first branch is perpendicular to the second branch; or the third branch is perpendicular to the fourth branch.

3. The antenna structure according to claim 1, wherein a first end of the first antenna unit is electrically connected with the first feeding end; or a first end of the second antenna unit is electrically connected with the second feeding end; wherein, when the first feeding end and the second feeding end are fed simultaneously, a current phase from the first feeding end to the first antenna unit is same as a current phase from the second feeding end to the second antenna unit.

4. The antenna structure according to claim 1, wherein a first end of the first antenna unit is connected with the first feeding end through a phase shifter; or a first end of the second antenna unit is connected with the second feeding end through a phase shifter; wherein, when the first feeding end and the second feeding end are fed simultaneously, a current phase from the first feeding end to the first antenna unit is same as a current phase from the second feeding end to the second antenna unit.

5. The antenna structure of any one of claims 1 to 4, wherein, the first antenna unit and the second antenna unit are respectively a plurality of a first end of a first antenna unit close to the first feeding end in the plurality of first antenna units is connected with the first feeding end, and a first end of a first antenna unit far away from the first feeding end in the plurality of first antenna units is connected with a second end of a previous first antenna unit adjacent thereto; a first end of a second antenna unit close to the second feeding end in the plurality of second antenna units is connected with the second feeding end, and a first end of a second antenna unit far away from the second feeding end in the plurality of second antenna units is connected with a second end of a previous second antenna unit adjacent thereto.

6. An intelligent wearable device, characterized by, The antenna structure comprises the antenna structure according to any one of claims 1 to 5.

7. The apparatus of claim 6, wherein, The antenna structure is arranged at at least one preset position on a wristband of the smart wearable device, and the preset position is adjacent to a smart watch face connected with the wristband.

8. The apparatus of claim 6, wherein, The antenna structure is arranged on a smart watch face of the smart wearable device and is adjacent to an antenna built-in in the smart watch face to couple feeding.

9. The apparatus of claim 7 or 8, wherein, The detection unit is configured to detect a motion posture of the smart wearable device in a wearing state. The control unit is connected with the detection unit and is configured to control at least one of the first feeding end and the second feeding end according to the motion posture of the smart wearable device. The motion posture includes an up-swing posture, a down-swing posture and a horizontal posture of the smart wearable device, 10. The apparatus of claim 9, wherein, When the smart wearable device is in the up-swing posture or the down-swing posture, the control unit controls a feeding end corresponding to a first antenna unit and a second antenna unit farther away from the ground to feed. When the smart wearable device is in the horizontal posture, the control unit controls the first feeding end and the second feeding end to feed simultaneously. ​

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