Wearable devices

Abstract

The present application discloses a wearable device, comprising: a ring-shaped active antenna and a ring-shaped passive antenna, wherein: the ring-shaped active antenna and the ring-shaped passive antenna are spaced apart in the thickness direction of the wearable device, a line connecting the center of the ring-shaped active antenna and the center of the ring-shaped passive antenna is perpendicular to a plane where the ring-shaped active antenna is located and a plane where the ring-shaped passive antenna is located, a first distance is spaced apart from the ring-shaped active antenna and the ring-shaped passive antenna, and a radius of the ring-shaped passive antenna is greater than a radius of the ring-shaped active antenna.

Description

Technical Field

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

[0002] In the 5G era, in addition to indicating time, smart watches should also have one or more functions such as reminders, navigation, calibration, monitoring, and interaction. The wireless communication system is the most critical link for smart watches to interact with other devices, and the antenna is a very important component for the wireless communication system.

[0003] Smart watches currently on the market have the characteristics of compact structure and miniaturization, but these characteristics mean that the clearance environment deteriorates and the antenna routing area is reduced for antenna design. The deterioration of the clearance environment will cause the global positioning system (GPS) antenna's directional pattern to be unstable when the smart watch is in different usage scenarios, affecting the antenna performance and thus the user experience. Summary of the invention

[0004] The present application discloses a wearable device, which solves the problem that the antenna's directional pattern is unstable in different usage scenarios, affecting the antenna performance and further affecting the user experience.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] An embodiment of the present application discloses a wearable device, comprising: a ring-shaped active antenna and a ring-shaped passive antenna, wherein: the ring-shaped active antenna and the ring-shaped passive antenna are spaced apart in the thickness direction of the wearable device, a line connecting the center of the ring-shaped active antenna and the center of the ring-shaped passive antenna is perpendicular to a plane where the ring-shaped active antenna is located and a plane where the ring-shaped passive antenna is located, a first distance is spaced between the ring-shaped active antenna and the ring-shaped passive antenna, and a radius of the ring-shaped passive antenna is greater than a radius of the ring-shaped active antenna.

[0007] The technical solution adopted in this application can achieve the following beneficial effects:

[0008] The present application provides a wearable device, comprising: a ring-shaped active antenna and a ring-shaped passive antenna, wherein: the ring-shaped active antenna and the ring-shaped passive antenna are spaced apart in the thickness direction of the wearable device, the line connecting the center of the ring-shaped active antenna and the center of the ring-shaped passive antenna is perpendicular to the plane where the ring-shaped active antenna is located and the plane where the ring-shaped passive antenna is located, the ring-shaped active antenna and the ring-shaped passive antenna are spaced apart by a first distance, and the radius of the ring-shaped passive antenna is greater than the radius of the ring-shaped active antenna. The present application introduces a ring-shaped passive antenna, and spaces the ring-shaped active antenna and the ring-shaped passive antenna apart. By setting the radius of the ring-shaped passive antenna to be greater than the radius of the ring-shaped active antenna, and adjusting the spacing distance between the ring-shaped active antenna and the ring-shaped passive antenna, the radiation pattern of the ring-shaped passive antenna and the ring-shaped active antenna array is adjusted, the performance of the antenna is enhanced, and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1a A top view of an antenna system structure of a wearable device disclosed in an embodiment of the present application;

[0010] Figure 1b A side view of an antenna system structure of a wearable device disclosed in an embodiment of the present application;

[0011] Figure 2a A schematic diagram of the structure of an antenna system for a wearable device disclosed in an embodiment of the present application;

[0012] Figure 2b for Figure 2a A schematic diagram of the corresponding radiation pattern;

[0013] Figure 3a A schematic diagram of the structure of an antenna system of another wearable device disclosed in an embodiment of the present application;

[0014] Figure 3b for Figure 3a A schematic diagram of the corresponding radiation pattern;

[0015] Figure 4 A side view of an antenna system structure of another wearable device disclosed in an embodiment of the present application;

[0016] Figure 5a A schematic diagram of the structure of an antenna system for another wearable device disclosed in an embodiment of the present application;

[0017] Figure 5b for Figure 5a Schematic diagram of the corresponding radiation pattern. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0019] 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 interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0020] The present application discloses a wearable device. Figure 1a A top view of an antenna system structure of a wearable device disclosed in an embodiment of the present application. Figure 1b A side view of the antenna system structure of a wearable device disclosed in an embodiment of the present application.

[0021] like Figure 1a and Figure 1b As shown, the wearable device disclosed in the present application includes: a ring-shaped active antenna 110 and a ring-shaped passive antenna 120, wherein: the ring-shaped active antenna 110 and the ring-shaped passive antenna 120 are spaced apart in the thickness direction of the wearable device, and a line connecting the center of the ring-shaped active antenna 110 and the center of the ring-shaped passive antenna 120 is perpendicular to a plane where the ring-shaped active antenna 110 and the plane where the ring-shaped passive antenna 120 are located, a first distance is spaced apart from the ring-shaped active antenna 110 and the ring-shaped passive antenna 120, and a radius of the ring-shaped passive antenna 120 is greater than a radius of the ring-shaped active antenna 110.

[0022] The loop passive antenna 120 forms an induced current by inducing the electromagnetic field of the loop active antenna 110. Assuming that the antenna is in the form of a dipole antenna, the current of the loop active antenna 110 is I1, the induced current of the loop passive antenna 120 is I2, the first distance between the loop active antenna 110 and the loop passive antenna 120 is H, and the dipole current is sinusoidally distributed. After approximate calculation, the directional pattern function of the binary array can be obtained: F2(θ)=1+me j(kH*cosθ+ξ) , where m represents the current amplitude ratio of the two antennas |I2| / |I1|, which can be calculated using the impedance equation of the coupled oscillator: ξ=π+arctanX 21 / R 21 -arctanX 22 / R 22 , where R and X represent resistance and reactance respectively, R 21 represents the resistance part of the mutual impedance of the loop passive antenna 120, X 21 represents the reactance part of the mutual impedance of the loop passive antenna 120, R 22 represents the resistance part of the self-impedance of the loop passive antenna 120, X 22 Represents the reactance part of the self-impedance of the loop passive antenna 120. Mutual impedance and self-impedance affect the amplitude and phase of the induced field of the loop passive antenna 120. It can be seen from the above relationship that the directional pattern of the binary array can be changed by changing the self-impedance and mutual impedance of the loop passive antenna 120. Further, the mutual impedance can be changed by changing the spatial relationship between the loop passive antenna 120 and the loop active antenna 110, and the self-impedance can be changed by changing the structure of the loop passive antenna 120.

[0023] Regarding changing the mutual impedance by changing the spatial relationship between the loop passive antenna 120 and the loop active antenna 110, specifically, the mutual impedance between the loop passive antenna 120 and the loop active antenna 110 can be changed by changing the first distance between the loop passive antenna 120 and the loop active antenna 110, thereby adjusting the radiation pattern of the array of the loop passive antenna 120 and the loop active antenna 110, enhancing the performance of the antenna, and improving the user experience.

[0024] In the embodiment of the present application, the radius of the loop-shaped passive antenna 120 is greater than the radius of the loop-shaped active antenna 110. By adjusting the radius difference between the loop-shaped passive antenna 120 and the loop-shaped active antenna 110, the mutual impedance between the loop-shaped passive antenna 120 and the loop-shaped active antenna 110 can be changed, the amplitude of the induced current of the loop-shaped passive antenna 120 can be adjusted, and the radiation pattern of the array of the loop-shaped passive antenna 120 and the loop-shaped active antenna 110 can be adjusted to enhance the performance of the antenna, thereby improving the user experience.

[0025] A wearable device provided by the present application includes: a loop-shaped active antenna 110 and a loop-shaped passive antenna 120, wherein: the loop-shaped active antenna 110 and the loop-shaped passive antenna 120 are arranged at intervals in the thickness direction of the wearable device, and the line connecting the center of the loop-shaped active antenna 110 and the center of the loop-shaped passive antenna 120 is perpendicular to the plane where the loop-shaped active antenna 110 and the plane where the loop-shaped passive antenna 120 are located, the loop-shaped active antenna 110 and the loop-shaped passive antenna 120 are spaced at a first distance, and the radius of the loop-shaped passive antenna 120 is greater than the radius of the loop-shaped active antenna 110. The present application introduces a loop-shaped passive antenna 120, and sets the loop-shaped active antenna 110 and the loop-shaped passive antenna 120 at intervals. By setting the radius of the loop-shaped passive antenna 120 to be larger than the radius of the loop-shaped active antenna 110, and adjusting the interval distance between the loop-shaped active antenna 110 and the loop-shaped passive antenna 120, the radiation pattern of the array of the loop-shaped passive antenna 120 and the loop-shaped active antenna 110 is adjusted, the performance of the antenna is enhanced, and the user experience is improved.

[0026] In one possible implementation, the radiation pattern of the array of the passive loop antenna 120 and the active loop antenna 110 can be adjusted by switching the electrical length of the passive loop antenna 120 and changing the self-impedance. Figure 2a As shown, the wearable device also includes a first control switch, wherein: the feeding point 420 of the ring-shaped active antenna 110 is set at the first position of the ring-shaped active antenna 110, and the first control switch is used to control at least one of the second position, the third position and the fourth position of the ring-shaped active antenna 110 to be connected or disconnected from the ground, wherein a first connecting line between the first position and the third position passes through the center of the ring-shaped active antenna, a second connecting line between the second position and the fourth position passes through the center of the ring-shaped active antenna, and the first connecting line is perpendicular to the second connecting line.

[0027] Taking a smart watch as an example, the first position and the third position mentioned above are positions in the smart watch that are far away from the human hand. Setting the feeding point 420 at the first position away from the human hand can reduce the impact of the human body on the antenna performance. When the first control switch controls the grounding position of the ring-shaped active antenna 110 to be different, the ring-shaped active antenna 110 can excite different modes and radiation pattern directions. For example, when the first control switch controls the second position, the third position, and the fourth position of the ring-shaped active antenna 110 to be disconnected from the ground, the main antenna form of the ring-shaped active antenna 110 is a monopole, which excites the monopole mode; when the first control switch controls the second position or the fourth position of the ring-shaped active antenna 110 to be connected to the ground, the main antenna form of the ring-shaped active antenna 110 is a loop antenna, which excites the loop mode, At this time, the loop active antenna 110 forms two radiation paths, specifically, a small loop from the feed point 420 to the second position and a large loop formed by the remaining radiation arms, and the corresponding operating frequencies of the two are f1 and f2 (f1>f2), respectively. At the same time, the first control switch controls the second position or the fourth position of the loop active antenna 110 to be connected to the ground, and the radiation pattern corresponding to the loop active antenna 110 is mirrored about the X-axis; when the first control switch controls the third position of the loop active antenna 110 to be connected to the ground, the main antenna form of the loop active antenna 110 is a loop antenna, which excites a loop mode, including two radiating arms of equal length, and the corresponding operating frequency is f3 (f1>f3>f2).

[0028] Of course, the grounding position of the loop-shaped active antenna 110 is not limited to the second position, the third position or the fourth position mentioned above. The grounding position of the loop-shaped active antenna 110 can be adjusted according to the specific design, and this application does not make any specific limitation on this.

[0029] In the embodiments of the present application, Figure 2a As shown, the wearable device also includes a second control switch 410, wherein: a first break 430 is set at the fifth position of the loop-shaped passive antenna 120, and the second control switch 410 is used to control the conduction or disconnection of the first break 430, and control the conduction or disconnection of at least one of the sixth position, the seventh position and the eighth position of the loop-shaped passive antenna 120 with the ground, wherein the fifth position corresponds to the first position, the sixth position corresponds to the second position, the seventh position corresponds to the third position, and the eighth position corresponds to the fourth position.

[0030] In the present application, the first position, the second position, the third position and the fourth position are positions on the ring-shaped active antenna 110, wherein a first line between the first position and the third position passes through the center of the ring-shaped active antenna 110, a second line between the second position and the fourth position passes through the center of the ring-shaped active antenna 110, and the first line is perpendicular to the second line. The fifth position, the sixth position, the seventh position and the eighth position are positions on the loop-shaped passive antenna 120, and the fifth position corresponds to the first position, the sixth position corresponds to the second position, the seventh position corresponds to the third position, and the eighth position corresponds to the fourth position. For example, if the first position is the "12 o'clock" position on the loop-shaped active antenna 110, the fifth position is the "12 o'clock" position on the loop-shaped passive antenna 120; if the second position is the "3 o'clock" position on the loop-shaped active antenna 110, the sixth position is the "3 o'clock" position on the loop-shaped passive antenna 120; if the third position is the "6 o'clock" position on the loop-shaped active antenna 110, the seventh position is the "6 o'clock" position on the loop-shaped passive antenna 120; if the fourth position is the "9 o'clock" position on the loop-shaped active antenna 110, the eighth position is the "9 o'clock" position on the loop-shaped passive antenna 120.

[0031] When the second control switch 410 controls the first break 430 set at the fifth position of the loop-shaped passive antenna 120 to be disconnected, and the second control switch 410 controls the sixth position, the seventh position and the eighth position of the loop-shaped passive antenna 120 to be disconnected from the ground, the antenna form of the loop-shaped passive antenna 120 is a suspended parasitic antenna. In this state, the radiation pattern is more oriented toward the normal direction, corresponding to Figure 2b In the case where the second control switch 410 controls the sixth position of the loop passive antenna 120 and is turned on to the ground, the phase of the induced current on the loop passive antenna 120 leads the loop active antenna 110, so the maximum radiation pattern is biased toward the side of the loop active antenna 110, corresponding to Figure 2b 302, at this time, the loop passive antenna 120 mainly acts as a reflector; when the second control switch 410 controls the seventh position of the loop passive antenna 120 to be connected to the ground, the loop passive antenna 120 is in a monopole form (T mode), at this time the length of the radiation arm is reduced, and the phase of the induced current on the loop passive antenna 120 lags behind the loop active antenna 110, so the maximum radiation pattern is biased to one side of the loop passive antenna 120, corresponding to Figure 2b of 304.

[0032] The embodiment of the present application controls the switching of the grounding position of the loop-shaped passive antenna 120 through the second control switch 410, changes the self-impedance of the loop-shaped passive antenna 120 without destroying the structural strength, controls the relative phase of the induced current of the loop-shaped passive antenna 120 and the loop-shaped active antenna 110, realizes the regulation of the radiation pattern of the array of the loop-shaped passive antenna 120 and the loop-shaped active antenna 110, and improves the user experience.

[0033] In another possible implementation, Figure 3a As shown, the feeding point 420 of the loop active antenna 110 is set at the first position of the loop active antenna 110, and the third position of the loop active antenna 110 is grounded, wherein a third connecting line between the first position and the third position passes through the center of the loop active antenna 110.

[0034] When the feeding point 420 of the loop-shaped active antenna 110 is set at the first position of the loop-shaped active antenna 110 and the third position of the loop-shaped active antenna 110 is grounded, the loop-shaped active antenna 110 is in the form of a loop antenna, and a loop (Loop) mode is excited, and the direction of the antenna's directional diagram is mainly on both sides. At this time, the electrical length of the loop-shaped passive antenna 120 is greater than the electrical length of the loop-shaped active antenna 110, the phase of the current of the loop-shaped passive antenna 120 is ahead of the phase of the current of the loop-shaped active antenna 110, and the radiation pattern is biased toward the loop-shaped active antenna 110. At this time, the loop-shaped passive antenna 120 mainly plays the role of a reflector, and the side wall 310 arranged around the loop-shaped passive antenna 120 can enhance the reflection effect of the loop-shaped passive antenna 120 on the loop-shaped active antenna 110.

[0035] In the embodiments of the present application, Figure 3a As shown, the wearable device also includes a third control switch 510, wherein: a first break 430 is set at the fifth position of the ring-shaped passive antenna 120, and a second break 520 is set at the seventh position of the ring-shaped passive antenna 120. The third control switch 510 is used to control at least one of the sixth position and the eighth position of the ring-shaped passive antenna 120 to be connected or disconnected from the ground, wherein a fourth line between the fifth position and the seventh position passes through the center of the ring-shaped passive antenna, a fifth line between the sixth position and the eighth position passes through the center of the ring-shaped passive antenna, the fourth line is perpendicular to the fifth line, the first position corresponds to the fifth position, and the third position corresponds to the seventh position.

[0036] When the third control switch 510 controls the sixth position and the eighth position of the loop-shaped passive antenna 120 to be disconnected from the ground, the loop-shaped passive antenna 120 is in the form of a suspended parasitic antenna. At this time, the radiation pattern is more oriented toward the normal direction, corresponding to Figure 3b401; when the third control switch 510 controls the sixth position of the loop passive antenna 120 to be connected to the ground, the electrical length of the loop passive antenna 120 is greater than the electrical length of the loop active antenna 110, the phase of the current of the loop passive antenna 120 leads the loop active antenna 110, and the radiation pattern is biased toward the active antenna, corresponding to Figure 3b 402; when the third control switch 510 controls the sixth position of the loop passive antenna 120 and is connected to the ground, the electrical length of the loop passive antenna 120 is greater than the electrical length of the loop active antenna 110, the phase of the current of the loop passive antenna 120 leads the active antenna 110, and the radiation pattern is biased toward the active antenna, corresponding to Figure 3b 403. By switching the scene, the radiation pattern can be switched left and right.

[0037] In a further technical solution, the wearable device may further include a capacitor element, one end of which is electrically connected to the sixth position, the other end of which is electrically connected to the ground, and / or one end of which is electrically connected to the eighth position, the other end of which is electrically connected to the ground. For the above-mentioned loop-shaped passive antenna 120, a capacitor element may be connected in series between the sixth position and the ground and / or between the eighth position and the ground, which is equivalent to shortening the size of the loop-shaped passive antenna 120, thereby generating more combination states and achieving the purpose of controlling the radiation directivity of the antenna. Specifically, the smaller the capacitance of the capacitor element connected in series, the shorter the size of the loop-shaped passive antenna 120.

[0038] In another possible implementation, the wearable device may further include an inductor element, one end of which is electrically connected to the sixth position, and the other end of which is electrically connected to the ground, and / or one end of which is electrically connected to the eighth position, and the other end of which is electrically connected to the ground. For the above-mentioned loop-shaped passive antenna 120, an inductor element may be connected in series between the sixth position and the ground and / or between the eighth position and the ground, which is equivalent to lengthening the size of the loop-shaped passive antenna 120, thereby generating more combination states, and achieving the purpose of controlling the radiation directivity of the antenna. Specifically, the greater the inductance of the series-connected inductor element, the longer the size of the loop-shaped passive antenna 120.

[0039] In the embodiment of the present application, the first position mentioned above overlaps with the projection of the wearable component of the wearable device on a plane perpendicular to the plane where the ring-shaped active antenna 110 is located. Figure 2a As shown, taking the wearable device as a smart watch as an example, the wearable part of the wearable device is a connector connecting the dial and the strap on the smart watch, and the feeding point 420 is set at the first position away from the human hand on the ring-shaped active antenna 110, that is, the feeding point 420 is set at the position of the connector connecting the dial and the strap, which can reduce the influence of the human body on the antenna performance.

[0040] In the present application, when the electrical length of the loop passive antenna 120 is greater than the electrical length of the loop active antenna 110, the phase of the current of the loop passive antenna 120 is ahead of the phase of the current of the loop active antenna 110, and the radiation pattern is biased toward the loop active antenna 110. At this time, the loop passive antenna 120 mainly acts as a reflector. Further, as Figure 4 As shown, a side wall 310 is disposed around the loop-shaped passive antenna 120. The side wall 310 disposed around the loop-shaped passive antenna 120 can enhance the reflection effect of the loop-shaped passive antenna 120 on the loop-shaped active antenna 110.

[0041] In one possible implementation, Figure 5a As shown, the loop-shaped passive antenna 120 can be connected to the back cover 810 of the wearable device. Specifically, the loop-shaped passive antenna 120 can be connected to the back cover 810 of the wearable device, and the loop-shaped passive antenna 120 and the back cover 810 of the wearable device can be used as a passive antenna as a whole to increase the inductive area of ​​the passive antenna, and the radiation directivity of the antenna can be controlled by changing the phase of the inductive current of the passive antenna composed of the loop-shaped passive antenna 120 and the back cover 810 of the wearable device.

[0042] In a further technical solution, the wearable device may further include a fourth control switch 910, the loop-shaped passive antenna 120 and the back cover 810 are divided into a plurality of independent passive sub-areas, and the fourth control switch 910 is used to control the connection or disconnection between the plurality of passive sub-areas. Specifically, the passive antenna composed of the loop-shaped passive antenna 120 and the back cover 810 may be divided into N independent passive sub-areas, and the connection or disconnection between the plurality of passive sub-areas is controlled by the fourth control switch 910, so as to realize the switching of the electrical length of the passive antenna composed of the loop-shaped passive antenna 120 and the back cover 810, thereby changing the phase of the induced current of the passive antenna composed of the loop-shaped passive antenna 120 and the back cover 810.

[0043] like Figure 5a As shown, the passive antenna composed of the loop passive antenna 120 and the back cover 810 can be divided into four independent passive sub-areas as an example, and the fourth control switch 910 controls the connection or disconnection between the four independent passive sub-areas. When the fourth control switch 910 controls the disconnection between the four independent passive sub-areas, the passive antenna composed of the loop passive antenna 120 and the back cover 810 is in a suspended parasitic form, and the radiation pattern of the antenna is in the normal direction, corresponding to Figure 5b 501; in the fourth control switch 910 control such as Figure 5aWhen the first area 901, the second area 902 and the third area 903 are connected as a whole, the electrical length thereof is obviously greater than the electrical length of the loop-shaped active antenna 110, the phase of the induced current of the passive antenna is ahead of the loop-shaped active antenna 110, and the radiation pattern is toward one side of the loop-shaped active antenna 110, which acts as a reflector. Figure 5a The electrical length of the fourth region 904 shown is shorter than the electrical length of the loop active antenna 110, the phase of the induced current lags behind the loop active antenna 110, and the radiation pattern is biased toward the fourth region 904, playing the role of a director. When the two effects of the passive antenna are superimposed, the radiation pattern of the antenna will be biased toward the fourth region 904, corresponding to Figure 5b 502.

[0044] The fourth control switch 910 controls the connection or disconnection between multiple passive sub-areas, and the radiation pattern can be realized as follows Figure 5b The switching of 502 / 503 / 504 / 505 shown in the figure has a similar effect to beam scanning. Furthermore, the more passive sub-areas the passive antenna composed of the annular passive antenna 120 and the back cover 810 includes, the higher the accuracy of the beam scanning.

[0045] In addition, for antennas with high gain requirements, such as Global Positioning System (GPS) antennas, a laminated design can be used to add reflectors and directors in the Z-axis direction to increase the gain of the antenna and improve the user experience.

[0046] The wearable device disclosed in the embodiments of the present application may be a wearable device such as a smart watch, and the embodiments of the present application do not limit the specific type of the wearable device.

[0047] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0048] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A wearable device, characterized in that: include: Loop active antenna and loop passive antenna, wherein: The annular active antenna and the annular passive antenna are spaced apart in the thickness direction of the wearable device, a line connecting the center of the annular active antenna and the center of the annular passive antenna is perpendicular to the plane where the annular active antenna is located and the plane where the annular passive antenna is located, a first distance is spaced between the annular active antenna and the annular passive antenna, and a radius of the annular passive antenna is greater than a radius of the annular active antenna; Also includes a first control switch, wherein: The feeding point of the ring-shaped active antenna is arranged at the first position of the ring-shaped active antenna, and the first control switch is used to control at least one of the second position, the third position and the fourth position of the ring-shaped active antenna to be connected or disconnected with the ground, wherein a first connecting line between the first position and the third position passes through the center of the circle of the ring-shaped active antenna, a second connecting line between the second position and the fourth position passes through the center of the circle of the ring-shaped active antenna, and the first connecting line is perpendicular to the second connecting line; Also includes a second control switch, wherein: A first break is provided at the fifth position of the ring-shaped passive antenna, and the second control switch is used to control the conduction or disconnection of the first break, and to control at least one of the sixth position, the seventh position and the eighth position of the ring-shaped passive antenna to be connected or disconnected to the ground; the fifth position corresponds to the first position, the sixth position corresponds to the second position, the seventh position corresponds to the third position, and the eighth position corresponds to the fourth position.

2. The wearable device according to claim 1, characterized in that: The feeding point of the ring-shaped active antenna is arranged at a first position of the ring-shaped active antenna, and a third position of the ring-shaped active antenna is grounded, wherein a third connecting line between the first position and the third position passes through the center of the ring-shaped active antenna.

3. The wearable device according to claim 2, characterized in that: Also includes a third control switch, wherein: A first break is provided at the fifth position of the annular passive antenna, and a second break is provided at the seventh position of the annular passive antenna. The third control switch is used to control at least one of the sixth position and the eighth position of the annular passive antenna to be connected or disconnected from the ground, wherein a fourth connecting line between the fifth position and the seventh position passes through the center of the annular passive antenna, a fifth connecting line between the sixth position and the eighth position passes through the center of the annular passive antenna, the fourth connecting line is perpendicular to the fifth connecting line, the first position corresponds to the fifth position, and the third position corresponds to the seventh position.

4. The wearable device according to claim 3, characterized in that: It also includes a capacitor element, one end of which is electrically connected to the sixth position and the other end of which is grounded, and / or one end of which is electrically connected to the eighth position and the other end of which is grounded.

5. The wearable device according to claim 3, characterized in that: It also includes an inductor element, one end of which is electrically connected to the sixth position, and the other end of which is electrically connected to the ground, and / or one end of which is electrically connected to the eighth position, and the other end of which is electrically connected to the ground.

6. The wearable device according to any one of claims 1 to 5, characterized in that: The first position overlaps with a projection of the wearable component of the wearable device on a plane perpendicular to a plane where the annular active antenna is located.

7. The wearable device according to any one of claims 1 to 5, characterized in that: The periphery of the annular passive antenna is provided with a side wall.

8. The wearable device according to claim 1 or 2, characterized in that: The annular passive antenna is connected to the back cover of the wearable device.

9. The wearable device according to claim 8, characterized in that: It also includes a fourth control switch, the annular passive antenna and the back cover are divided into a plurality of mutually independent passive sub-areas, and the fourth control switch is used to control the connection or disconnection between the plurality of passive sub-areas.

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