Wearable device

Abstract

The application discloses a wearable device, and belongs to the technical field of communication. The wearable device comprises a main body part, a wearing part and an antenna. The main body part comprises a first conductive structure, the wearing part comprises a second conductive structure, the first conductive structure is electrically connected with the second conductive structure, and the first conductive structure and the second conductive structure jointly constitute an antenna ground of the antenna. A slot is arranged between the first conductive structure and the second conductive structure, and a feed source of the antenna is electrically connected to the first conductive structure or the second conductive structure. The slot between the main body part and the wearing part of the wearable device can be utilized to adjust the antenna ground current, and the performance of the antenna is improved.

Description

TECHNICAL FIELD

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

[0002] Wearable devices, such as smart glasses, gradually enter the daily life of the public, and people have higher and higher requirements for the communication and online functions thereof. Compared with smart phones, the wearable devices are smaller in size, and the space left for antenna design is also smaller. Moreover, the working state of the wearable devices is complex, and the space is narrow, and the antenna layout is close, which causes great difficulty in debugging of communication indexes such as a radiation pattern, an isolation degree, a specific absorption ratio (SAR) and the like. SUMMARY

[0003] The purpose of the embodiment of the present application is to provide a wearable device which can adjust the ground current of an antenna by using a slot gap on the wearable device, so as to optimize the performance of the antenna.

[0004] The embodiment of the present application provides a wearable device, comprising a main body part, a wearable part and an antenna.

[0005] The main body part comprises a first conductive structure, the wearable part comprises a second conductive structure, the first conductive structure is electrically connected with the second conductive structure, and the first conductive structure and the second conductive structure jointly constitute an antenna ground of the antenna, the first conductive structure and the second conductive structure have a slot gap therebetween, and a feed source of the antenna is electrically connected to the first conductive structure or the second conductive structure.

[0006] In the embodiment of the present application, the main body part and the wearable part of the wearable device are used as the antenna ground of the antenna. At this time, based on the slot gap between the main body part and the wearable part, the ground current distribution of the antenna ground can be adjusted. In this way, by adjusting the ground current distribution of the antenna ground, the radiation pattern of the antenna can be adjusted, and the SAR of the antenna can be reduced, and the isolation degree between multiple antennas can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a front view of a structure of a wearable device provided by the embodiment of the present application;

[0008] Figure 2 is an antenna and a current distribution diagram thereof in the related art;

[0009] Figure 3 is a current distribution diagram of an antenna after a slot gap is added to the antenna ground in the related art; Figure 2

[0010] Figure 4 is a front view of a structure of a wearable device provided by the embodiment of the present application; ​

[0011] Figure 5 is one of the simulation current diagrams of the wearable device provided by the embodiment of the present application;

[0012] Figure 6 is an antenna pattern of the wearable device provided by the embodiment of the present application;

[0013] Figure 7 is another structure diagram of the wearable device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all of 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 without creative work fall within the scope of the present application.

[0015] The terms "first", "second", and the like 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 usually a class, and are not limited to 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.

[0016] The wearable device provided by the embodiments of the present application will be described in detail below in combination with the drawings, specific embodiments and application scenarios.

[0017] Please refer to Figure 1 and Figure 4 The wearable device provided by the embodiments of the present application includes a main body part 10, a wearing part 20 and an antenna 30.

[0018] The main body part 10 includes a first conductive structure 11, the wearing part 20 includes a second conductive structure 21, the first conductive structure 11 is electrically connected with the second conductive structure 21, and together constitutes an antenna ground of the antenna 30. There is a slot 40 between the first conductive structure 11 and the second conductive structure 21, and a feed source 31 of the antenna 30 is electrically connected to the first conductive structure 11 or the second conductive structure 21.

[0019] It should be noted that, as Figures 1 to 7In the wearable device embodiment shown, the first conductive structure 11 covers the entire main body 10. However, in practical applications, the first conductive structure 11 may only cover a portion of the main body 10, which is not a specific limitation here.

[0020] In addition, the feed source 31 can be a feed source in the radio frequency path, such as: the radio frequency path includes: antenna feed, filter circuit, matching circuit, etc. In this case, the feed source 31 of the antenna 30 is electrically connected to the first conductive structure or the second conductive structure. It can be that: the ground terminal of the radio frequency path is electrically connected to the antenna ground of the antenna 30 (i.e., the first conductive structure 11 or the second conductive structure 21), and the feed source terminal of the radio frequency path is electrically connected to the radiator of the antenna 30.

[0021] In this embodiment, the example of the feed 31 of the antenna 30 being electrically connected to the second conductive structure 21 is used for illustration. In practice, the feed 31 of the antenna 30 may also be electrically connected to the first conductive structure 11, which is not specifically limited here.

[0022] Optional, such as Figure 4 As shown, the first conductive structure 11 and the second conductive structure 21 are electrically connected through the bottom 401 of the slot 40. At this time, the current directions on the opposite side walls of the slot 40 can be opposite.

[0023] Optionally, the shortest straight line from the feed 31 to the slot 40 intersects with the first region 402 of the slot 40, wherein the first region 402 is located between the opening end of the slot and the bottom 401 of the slot.

[0024] In one embodiment, the open ends of the feed source 31 and the slot 40 can be located on the same side of the first conductive structure 11 or the second conductive structure 21.

[0025] In this embodiment, the current on the first sidewall of the slot 40 can be directed from the opening end of the slot 40 towards the bottom 401 of the slot 40, and the current on the second sidewall of the slot 40 can be directed from the bottom 401 of the slot 40 towards the opening end of the slot 40. The first sidewall of the slot 40 is the one of the two opposing sidewalls of the slot 40 that is closer to the feed source 31, and the second sidewall of the slot 40 is the other opposing sidewall. This creates currents in opposite directions on the opposing sidewalls of the slot 40, preventing the current from radiating energy outside the slot 40.

[0026] The wearable device mentioned above may include wearable devices such as smartwatches and smart glasses. The main body 10 of the wearable device may be the watch face of a smartwatch or the frame of smart glasses. The wearing part 20 of the wearable device may be the watch strap of a smartwatch or the temple of smart glasses. In this case, the slot 40 may be the gap between the watch face and the watch strap of a smartwatch or the gap between the frame and the temple of smart glasses.

[0027] In the embodiments of the present application, the wearable device is taken as an example of smart glasses, which is not limited herein.

[0028] In the case where the smart glasses include lenses, the first conductive structure 11 can only cover the area on the frame without lenses, and at this time, the first conductive structure 11 can be a metal (such as copper, silver, etc.) conductive layer, or a transparent conductive layer, or any conductive layer.

[0029] In some embodiments, the first conductive structure 11 can also cover the area with lenses, and at this time, the part of the first conductive structure 11 covering the lenses can be a transparent conductive layer, and for the part of the first conductive structure 11 covering the frame without lenses and the second conductive structure 21, they can be any conductive layer, which is not limited herein.

[0030] It is worth mentioning that when setting an antenna on an electronic device such as a mobile phone, a slot can also be set on the antenna ground, but due to the integrity of the mobile phone structure and the limited space of the antenna layout, the size of the slot is often very limited, for example, it can only be set to 0.2mm, 0.5mm, etc. When the main body part and the wearable part of the wearable device are used to form the antenna ground, the gap between the main body part and the wearable part itself can form a slot on the antenna ground, and the width of the slot is relatively large, for example, it can be set to 1mm or 2mm or even wider. Based on the relatively wide slot, the antenna ground current can be more effectively adjusted, the distribution of the antenna peripheral ground current can be changed, and the purpose of controlling the antenna pattern, reducing the antenna SAR, and improving the isolation between multiple antennas can be achieved.

[0031] For example, as shown in Figure 2 In the related art, two half-wave period currents are generated on the antenna 201 and the antenna ground 202, and the two half-wave period currents generate two pattern lobes in the Z direction, and due to the right traction of the main board ground, the main lobe of the pattern is tilted to the right. At this time, if a slot 203 is opened on the antenna ground 202, as shown in Figure 3 The right ground current is disconnected by the slot 203, so the traction of the right ground is weakened, and the pattern is radiated to the left. Specifically, as shown in Figure 3 The current direction in the slot 203 is opposite, and cannot radiate energy outward, so the right radiation intensity of the antenna 201 is weakened, and the left radiation energy of the antenna 201 is strengthened, so that the degree of tilting of the main lobe of the pattern to the right can be reduced.

[0032] It should be noted that when the wearable device provided in this application embodiment is a smart glasses, the antenna 30 can be set on the frame or on the temple. In this application embodiment, the antenna 30 is set on the temple as an example for illustration.

[0033] Optionally, antenna 30 can be a common-mode antenna, such as a monopole antenna or an inverted-FAntenna (IFA). The ground current intensity of this common-mode antenna is relatively large. When a slot 40 is set on the antenna ground, the adjustment range of low current can be improved, thereby significantly improving the antenna performance of antenna 30.

[0034] Optionally, when the antenna 30 is an inverted F antenna, the feed 31 and grounding point 32 of the inverted F antenna are electrically connected to the target conductive structure, wherein the target conductive structure is either the first conductive structure 11 or the second conductive structure 21.

[0035] In the case where antenna 30 is an IFA antenna, the grounding point of the IFA antenna can be connected to the second conductive structure 21, for example: Figure 7 As shown, the grounding point 32 and feed 31 of the IFA antenna are connected to the third side of the second conductive structure 21 (i.e., as shown). Figure 7 (the upper side of the feed), and the grounding point 32 is located on the side of the feed 31 away from the slot 40.

[0036] Of course, when the feed 31 of the IFA antenna is connected to the first conductive structure 11, the ground point 32 of the IFA antenna can also be connected to the first conductive structure 11. For example, the ground point 32 of the IFA antenna and the feed 31 are connected to the fourth side of the first conductive structure 11, and the ground point 32 is located on the side of the feed 31 away from the slot 40. The fourth side of the first conductive structure 11 is the side where the opening end of the slot 40 is located, which will not be described in detail here.

[0037] Optionally, the distance between the feed 31 and the slot 40 is 1 / 4 times the target wavelength, wherein the target wavelength is the wavelength corresponding to the operating frequency of the antenna 30.

[0038] The low current at a position 1 / 4λ away from the feed 31 on the antenna ground is close to 0, where λ represents the wavelength corresponding to the power frequency of the antenna 30.

[0039] In this way, the current intensity in the opposite side walls of the slot 40 can be equal and the direction can be opposite, which can adjust the current distribution of the antenna ground to a greater extent.

[0040] It should be noted that the distance between the feed source 31 and the slot 40 is 1 / 4 of the target wavelength, and can be approximately 1 / 4λ, for example, the distance between the feed source 31 and the slot 40 can be between 0.2λ and 0.3λ.

[0041] Optionally, the depth of the slot 40 in the first direction is 1 / 4 of the target wavelength, wherein the target wavelength is the wavelength corresponding to the operating frequency of the antenna 30, and the first direction is from the opening side of the slot 40 to the groove bottom of the slot 40.

[0042] Wherein, the current path required for the antenna ground current to decrease from maximum to minimum or increase from minimum to maximum is approximately 1 / 4λ, by setting the depth of the slot 40 to 1 / 4λ, the current intensity in the opposite two side walls of the slot 40 can be equal and opposite, and the current distribution of the antenna ground can be adjusted to a greater extent.

[0043] Wherein, in the case that the distance between the feed source 31 and the slot 40 is approximately 1 / 4λ and the depth of the slot 40 is approximately 1 / 4λ, the current on the first side wall of the slot 40 gradually increases from 0 in the first direction, and the current on the second side wall of the slot 40 gradually decreases from 0 in the opposite direction of the first direction, wherein the first side wall of the slot 40 is the side wall of the slot 40 close to the feed 31, and the second side wall of the slot 40 is the side wall of the slot 40 away from the feed 31.

[0044] Of course, in implementation, the depth of the slot 40 can also be greater than 1 / 4λ, which is not limited here.

[0045] Optionally, the wearable device provided by the embodiment of the present application further comprises a tuning device (not shown);

[0046] The tuning device is electrically connected between the first side edge of the first conductive structure 11 and the second side edge of the second conductive structure 21, and at least one of the capacitance, resistance and inductance of the tuning device is adjustable.

[0047] Wherein, the slot 40 is located between the first conductive structure 11 and the second conductive structure 21, at this time, the above-mentioned tuning device is electrically connected between the first side edge of the first conductive structure 11 and the second side edge of the second conductive structure 21, that is, the tuning device can be electrically connected between the opposite two side walls of the slot 40, and the electrical connection nodes of the tuning device and the first conductive structure 11 and the second conductive structure 21 can be close to the opening end of the slot 40. For example, as shown in Figure 5 A port 50 is added to the slot 40, the tuning device can be connected through the port 50, and the antenna ground current can be changed through the tuning device, wherein, Figure 5 The arrowed straight line in the above figure is a schematic diagram of the simulation current, and it should be noted that, asFigure 5 In the illustrated embodiment, it is assumed that the port 50 is in an open state, i.e. Figure 5 A diagram of the simulation current when the tuning device is not connected.

[0048] In this way, by arranging the tuning device between the first conductive structure 11 and the second conductive structure 21, the current intensity near the feed 31 can be reduced, the electromagnetic wave radiation energy can be dispersed, and the SAR of the antenna can be reduced. In addition, by adjusting at least one of the capacitance, resistance and inductance of the tuning device to adjust the antenna ground current, the radiation pattern of the antenna 30 can also be changed.

[0049] For example: Figure 6 In the illustrated embodiment, line A represents the radiation pattern when the capacitance of the tuning device is 0.8 pf, line B represents the radiation pattern when the capacitance of the tuning device is 1 pf, and line C represents the radiation pattern when the capacitance of the tuning device is 1.1 pf. It can be seen that Figure 6 when the capacitance of the tuning device is adjusted to 0.8 pf, 1 pf and 1.1 pf respectively, the radiation pattern of the antenna 30 gradually becomes better in the 0 degree direction, where the 0 degree direction can be a direction perpendicular to the first conductive structure 11, for example: the field of view direction of the smart glasses.

[0050] In addition, it is assumed that the capacitance of the tuning device is adjusted to 0.8 pf and 1.1 pf respectively, and the SAR of the antenna 30 is as shown in Table 1:

[0051] Table 1

[0052] Capacitance value of tuning device SAR value (W / Kg) 0.8 pf 1.6 1.1 pf 1.12

[0053] As can be seen from Table 1 above, in the case of adjusting the capacitance of the tuning device from 0.8 pf to 1.1 pf, the SAR value of the antenna 30 can be improved.

[0054] In some embodiments, at least one of the capacitance, resistance and inductance of the tuning device is manually adjusted according to the user's operation of the wearable device.

[0055] In other embodiments, a controller can be used to automatically adjust at least one of the capacitance, resistance and inductance of the tuning device.

[0056] Optionally, the wearable device provided by the embodiments of the present application further comprises a controller (not shown);

[0057] The controller is configured to obtain parameter information of the antenna 30, and adjust at least one of the capacitance, resistance and inductance of the tuning device according to the parameter information, wherein the parameter information comprises the operating frequency of the antenna 30.

[0058] The controller can be a radio frequency controller of the antenna 30, or a newly added controller in the radio frequency circuit, which is not specifically limited here.

[0059] The controller can realize at least one of the following functions according to the actual working condition of the antenna 30: impedance matching, improving the radiation pattern of the antenna 30, and reducing the SAR of the antenna 30.

[0060] Optionally, as shown in Figure 1 and Figure 4 The first conductive structure 11 is electrically connected to the second conductive structure 21 through the third conductive structure 22.

[0061] The third side edge of the third conductive structure 22 abuts against the fourth side edge of the second conductive structure 21, and the third side edge of the third conductive structure 22 constitutes the groove bottom of the slot 40. The feed source 31 is located at the fifth side edge of the second conductive structure 21, and the fourth side edge of the second conductive structure 21 and the fifth side edge of the second conductive structure 21 are opposite two side edges of the second conductive structure 21 along the first direction, wherein the first direction is from the opening side of the slot 40 to the groove bottom of the slot 40.

[0062] For example, as shown in Figure 5 The left side edge of the third conductive structure 22 is connected to the first conductive structure 11, and the upper side edge (i.e., the third side edge) of the third conductive structure 22 is connected to the second conductive structure 21.

[0063] When the main body part 10 and the wearing part 20 are hinged, the third conductive structure 22 can include a bearing capable of conducting electricity, so that the third conductive structure 22 can realize the electrical connection between the first conductive structure 11 and the second conductive structure 21, and also enable the main body part 10 and the wearing part 20 to rotate around the bearing, for example, the hinge between the temple and the frame.

[0064] Of course, the third conductive structure 22 can also be a flexible structure, such as a metal sheet that can be bent, which can also realize the electrical connection between the first conductive structure 11 and the second conductive structure 21, and enable the main body part 10 and the wearing part 20 to move relative to each other, which is not specifically limited here.

[0065] It is worth mentioning that in application, the slot 40 can also be filled with a non-conductive material to improve the structural integrity of the wearable device. In addition, the frame and the temple can include an insulating material layer, wherein the insulating material layer can be wrapped outside the first conductive structure 11, the second conductive structure 21, the third conductive structure 22, and the antenna 30.

[0066] In the embodiments of the present application, the main body part and the wearing part of the wearable device are used as an antenna ground, at this time, based on the slot gap between the main body part and the wearing part, the ground current distribution of the antenna ground can be adjusted, in this way, by adjusting the ground current distribution of the antenna ground, the antenna pattern can be adjusted, and the SAR of the antenna can be reduced, and the isolation between multiple antennas can be improved.

[0067] It should be noted that, in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles, or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent to such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element. In addition, it should be pointed out that the scope of the methods and electronic devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0068] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and a necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) execute the methods described in various embodiments of the present application.

[0069] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, the above-mentioned 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 protection scope of the claims.

Claims

1. A wearable device, comprising: The application relates to a wearable device, comprising: a main body part, a wearing part, a tuning device and an antenna; the main body part comprises a first conductive structure, the wearing part comprises a second conductive structure, the first conductive structure is electrically connected with the second conductive structure, and the first conductive structure and the second conductive structure jointly form an antenna ground of the antenna, a slot is arranged between the first conductive structure and the second conductive structure, and a feed source of the antenna is electrically connected to the first conductive structure or the second conductive structure; the tuning device is electrically connected between a first side of the first conductive structure and a second side of the second conductive structure, at least one of capacitance, resistance and inductance of the tuning device is adjustable, wherein the first side of the first conductive structure and the second side of the second conductive structure form opposite two side walls of the slot; a distance between the feed source and the slot is 1 / 4 times of a target wavelength, wherein the target wavelength is a wavelength corresponding to a working frequency of the antenna; or a depth of the slot along a first direction is 1 / 4 times of the target wavelength, wherein the target wavelength is a wavelength corresponding to a working frequency of the antenna, and the first direction is a direction from an opening side of the slot to a slot bottom of the slot.

2. The wearable device of claim 1, wherein, The first conductive structure and the second conductive structure are electrically connected through a slot bottom part of the slot.

3. The wearable device of claim 2, wherein, A shortest straight line from the feed source to the slot intersects a first region of the slot, wherein the first region is located between an opening end of the slot and the slot bottom part.

4. The wearable device of claim 1, wherein, The wearable device is smart glasses, the main body part is a glasses frame, and the wearing part is a glasses leg.

5. The wearable device of claim 4, wherein, A first part of the first conductive structure is made of a transparent conductive material, and the first part is a part of the first conductive structure covering a glasses lens of the smart glasses. 6.The wearable device according to any one of claims 1 to 5, characterized in that, The antenna is a common mode antenna.

7. The wearable device of claim 6, wherein, In the case that the antenna is an inverted F antenna, a feed source and a grounding point of the inverted F antenna are electrically connected with a target conductive structure, wherein the target conductive structure is any one of the first conductive structure and the second conductive structure. 8.The wearable device according to any one of claims 1 to 5, wherein, The wearing part further comprises a third conductive structure, and the first conductive structure is electrically connected with the second conductive structure through the third conductive structure; a third side of the third conductive structure abuts against a fourth side of the second conductive structure, the third side of the third conductive structure forms a slot bottom of the slot, the feed source is located at a fifth side of the second conductive structure, and the fourth side of the second conductive structure and the fifth side of the second conductive structure are opposite two sides of the second conductive structure along a first direction, wherein the first direction is a direction from an opening side of the slot to a slot bottom of the slot.

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