Wearable device

Abstract

The application provides a wearable device, which comprises a first antenna and a second antenna, the first antenna is parallel to the front of the wearable device, the second antenna comprises a first branch, the first branch extends along a circular track, the circular track is perpendicular to the first antenna, and circularly polarized radiation is generated in a state where equal-amplitude and 90-degree phase-difference excitation is applied to the first antenna and the first branch. The wearable device of the application fully utilizes the space of the wearable device through reasonable layout of the first antenna and the second antenna, achieves the effect of approximate omnidirectional circular polarization, and effectively improves the antenna performance of the wearable device.

Description

Technical Field

[0001] This application belongs to the field of wearable device technology. Background Technology

[0002] Today's wearable devices are becoming increasingly smaller, while performance requirements are rising. Simultaneously, the increasing number and expansion of functions necessitate the integration of more complex circuits and components, significantly compressing the overall design space. Antenna design space, in particular, is severely squeezed, with its size being drastically reduced. As a core component of wireless communication, the limited design space of antennas leads to a decline in the communication performance of wearable devices. Summary of the Invention

[0003] The purpose of this application is to provide a wearable device to solve the technical problem of degraded communication performance of antennas in wearable devices in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a wearable device, the wearable device comprising:

[0005] First antenna; The first antenna is parallel to the front of the wearable device;

[0006] The second antenna includes a first stub that extends along a circular trajectory perpendicular to the first antenna.

[0007] Circularly polarized radiation is generated when the first antenna and the first stub are subjected to excitations of equal amplitude and a phase difference of 90°.

[0008] Optionally, the first segment includes a first segment and a second segment, which are connected to each other. The first segment is located on the side closer to the front of the wearable device, and the second segment is located on the side closer to the back of the wearable device.

[0009] Optionally, the first branch has an open annular structure, the first branch includes a first end and a second end, the first end and the second end are spaced apart to form an opening, and the feed point of the first branch is located at the first end or the second end.

[0010] Optionally, the first branch is located on one side of the wearable device in the circumferential direction.

[0011] Optionally, the wearable device includes a mid-frame, with the first branch disposed on the mid-frame.

[0012] Optionally, the perimeter of the first stub is half the operating wavelength of the first stub.

[0013] Optionally, both the first antenna and the first stub operate in the L5 band.

[0014] Optionally, the wearable device includes a motherboard, which serves as the first antenna; or, the first antenna may be a rod-shaped structure, a rectangular structure, or a spiral structure.

[0015] Optionally, the second antenna includes a second stub connected to the first stub, and the operating frequency band of the second stub is different from that of the first stub.

[0016] Optionally, the second branch may operate in at least two WiFi bands.

[0017] The beneficial effects of the wearable device provided in this application are as follows: Compared with the prior art, the antenna of the wearable device of this application includes a first antenna and a second antenna. The first stub of the second antenna extends along a circular trajectory, and the circular trajectory is perpendicular to the first antenna. Under the condition that the first antenna and the first stub are excited with equal amplitude and a phase difference of 90°, approximately omnidirectional circular polarization radiation is generated, thereby making full use of the space of the wearable device and effectively improving the antenna performance of the wearable device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a frontal schematic diagram of the antenna of the wearable device according to an embodiment of this application;

[0020] Figure 2 This is a side view of the second antenna of the wearable device according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the internal structure of a wearable device according to an embodiment of this application;

[0022] Figure 4 A schematic diagram of the motherboard acting as the first antenna in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the antenna arrangement in one embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the antenna arrangement in another embodiment of this application;

[0025] Figure 7 The image shows the antenna pattern of the wearable device in the L5 band in an embodiment of this application;

[0026] Figure 8The simulated standing wave curve of the antenna of the wearable device in this application embodiment;

[0027] Figure 9 The image shows the antenna simulation efficiency curve of the wearable device in this application embodiment.

[0028] The following are the reference numerals in the figure: First antenna 11; Second antenna 12; First stub 121; Second stub 122; First segment 1211; Second segment 1212; First end 1213; Second end 1214; Screen 2; Main board 3; Antenna matching unit 31; Wireless transceiver 32; Battery 4; Middle frame 5; Base support 6. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] In today's digital age, wearable devices have become deeply integrated into people's daily lives. Smartwatches, smart bracelets, and wristwatches, among other common wearable devices, play a crucial role in personal health management, information exchange, and convenient travel due to their portability and close-fitting nature. Antennas, as the core component of wireless communication in wearable devices, bear the important responsibility of signal transmission and reception. Whether it's precise positioning based on the Global Positioning System (GPS) or the BeiDou Navigation Satellite System (BDS), voice calls via mobile networks, or network connections and data transmission using Wi-Fi technology, all rely on the stable operation of the antenna. However, with the rapid iteration of technology, wearable devices are developing towards miniaturization, high performance, and multifunctionality. This has led to increasingly compact internal spaces, severely squeezing the design space for antennas and presenting them with unprecedented challenges.

[0034] Taking smartwatches as an example, their functions have expanded from simple timekeeping to diverse applications. Through the collaborative work of a built-in antenna and positioning system, smartwatches can accurately pinpoint the user's location, meeting navigation needs in scenarios such as outdoor sports and daily commutes. In terms of communication, the antenna connects to mobile networks to ensure stable calls, connects to Wi-Fi for fast data exchange, supports information push and application operation, providing users with convenient information access and interactive experiences. However, due to limitations in size reduction and functional expansion, the design space left for antennas inside smartwatches is extremely limited.

[0035] To achieve numerous functions, smartwatches need to integrate a large number of complex circuits and components, which further compresses the design space for antennas. When antenna design space is limited, the communication performance of the device will be directly affected. Reducing antenna size leads to lower signal strength and narrower signal coverage, resulting in problems such as positioning errors, call interruptions, decreased data transmission rates, and unstable navigation signal reception. Furthermore, because wearable devices are in close contact with the human body, the absorption and interference of signals by the body will also exacerbate the deterioration of communication performance. In conclusion, with the trend of miniaturization and increasing functional diversity in wearable devices, designing high-performance antennas within limited space to solve this problem is becoming increasingly urgent.

[0036] In light of the above problems, this application proposes a wearable device. Please refer to [link / reference]. Figure 1 and Figure 2 In some embodiments of this application, a wearable device includes:

[0037] First antenna 11; First antenna 11 is parallel to the front of the wearable device;

[0038] Second antenna 12; Second antenna 12 includes a first stub 121, the first stub 121 extends along a circular trajectory, the circular trajectory is perpendicular to the first antenna 11;

[0039] Circularly polarized radiation is generated when the first antenna 11 and the first stub 121 are subjected to excitations of equal amplitude and 90° phase difference.

[0040] In this embodiment, the front of the wearable device refers to the side of the wearable device that faces outward during normal use, facilitating user operation and information viewing; typically, this is the side with the display screen. Generally, the thickness of the wearable device is smaller than its lateral dimension. For example, for a square smartwatch, its thickness is much smaller than its length and width. The first antenna 11 is positioned parallel to the front of the wearable device, i.e., the first antenna 11 is parallel to... Figure 1 The planar shape shown allows the first antenna 11 to be positioned laterally along the wearable device. Compared to positioning the first antenna 11 perpendicular to the front of the wearable device, this provides more space in the extension direction of the first antenna 11.

[0041] The second antenna 12 includes a first stub 121. Specifically, the second antenna 12 can consist solely of the first stub 121, or it can have other stubs. The first stub 121 extends along a circular path, giving the second antenna 12 a radiation characteristic similar to a loop antenna in space, with relatively uniform signal radiation and reception capabilities in the circumferential direction. It should be noted that extending along a circular trajectory does not mean that the first stub 121 is a complete loop, and the loop does not refer to a circular ring. Rather, it means that the shape of the first stub 121 can be any closed or open curve or broken line shape, and its trajectory forms a loop-like structure in space, but is not limited to regular shapes such as circles or ellipses. For example, the first stub 121 can be U-shaped, or it can take the form of C-shape, V-shape, circle, ellipse, G-shape, polygon, etc. Figure 2 In the illustrated embodiment, the first branch 121 is U-shaped. The more complete the ring shape of the first branch 121, the wider the circumferential radiation coverage. It should also be noted that the ring trajectory of the first branch 121 is perpendicular to the first antenna 11, and the first antenna 11 is parallel to the front of the wearable device. Therefore, the actual ring trajectory of the first branch 121 is located on or approximately on a cross-section parallel to the thickness direction of the wearable device. For example... Figure 1 In the embodiment shown, the circular trajectory has a certain curvature and is not entirely on the same cross section.

[0042] The first antenna 11 is perpendicular to the circular trajectory of the first stub 121. This is approximately equivalent to a monopole antenna and a loop antenna that are perpendicular to each other, which is the key layout basis for generating circularly polarized radiation and achieving an approximately omnidirectional effect. Applying a specific electrical signal excitation to the first antenna 11 and the first stub 121 with the same amplitude and a 90° phase difference is a necessary condition for generating circularly polarized radiation. Through this special excitation, combined with the perpendicularity of the first antenna 11 and the first stub 121, the radiation pattern of the first stub 121 can be made to have the same shape as the radiation pattern of the first antenna 11, but the directions of their electric and magnetic fields are interchanged. For example, the direction of the magnetic field of the first stub 121 is the direction of the electric field of the first antenna 11, and vice versa. At the same time, the phase difference between the electric field of the first stub 121 and the electric field of the first antenna 11 is 90° at any angle in space, achieving an approximately omnidirectional circular polarization effect and greatly improving the signal processing capability of the device in different directions.

[0043] It should be noted that circular polarization radiation refers to the polarization in which the electric field vector of an electromagnetic wave rotates in a circle on a plane perpendicular to the direction of propagation. It has many advantages, such as resistance to multipath interference, high tolerance to polarization mismatch, and strong dynamic adaptability. Omnidirectional circular polarization, on the other hand, means that circular polarization can be achieved at any angle in the circumferential direction of the antenna, which can greatly improve the performance of the antenna.

[0044] In summary, the wearable device of this embodiment, through the reasonable arrangement of the first antenna 11 and the second antenna 12, makes full use of the structural characteristics of the wearable device itself, ensuring that both the first antenna 11 and the second antenna 12 have sufficient space to be arranged, so that they can each perform their functions well. At the same time, it can also achieve an effect of near omnidirectional circular polarization, effectively improving the antenna performance of the wearable device.

[0045] Please see Figure 2 In some embodiments of this application, the first branch 121 includes a first segment 1211 and a second segment 1212, the first segment 1211 and the second segment 1212 are connected to each other, the first segment 1211 is located on the side closer to the front of the wearable device, and the first segment 1212 is located on the side closer to the back of the wearable device.

[0046] In this embodiment, the first branch 121 includes a first segment 1211 and a second segment 1212. The first segment 1211 and the second segment 1212 are connected to each other to form the complete structure of the first branch 121, making it approximately ring-shaped. The first segment 1211 is located on the side closer to the front of the wearable device, and the second segment 1212 is located on the side closer to the back of the wearable device, so that the two can be separated by a certain distance to form part of the ring, and both the first segment 1211 and the second segment 1212 extend in the lateral direction.

[0047] From a space utilization perspective, due to the limited space in the thickness direction of wearable devices, the usable length would be severely restricted if the antenna were arranged in that direction. However, its relatively large lateral dimension provides ample space for extending the antenna length. The lateral arrangement of the first segment 1211 and the second segment 1212 avoids the space bottleneck in the thickness direction, making full use of the ample lateral space, thereby maximizing the length of the second antenna 12. This design for extending the antenna length brings several positive effects.

[0048] First, from the perspective of the physical principles of radiation and reception, antenna length is closely related to radiation and reception capabilities. A longer antenna can couple more effectively with external electromagnetic waves, enhancing signal radiation intensity and reception sensitivity. By extending the length of the second antenna 12, the first stub 121 can generate a stronger electromagnetic field during operation, thereby more efficiently converting electrical signals into electromagnetic waves for radiation. Simultaneously, it can more sensitively capture weak external electromagnetic wave signals and convert them into electrical signals for equipment processing.

[0049] Secondly, the increased length allows the first branch 121 to cover more complex circumferential directions. In space, signal propagation is omnidirectional, and signals from different directions can all affect the device's communication. Finally, from a polarization perspective, this design helps to achieve more comprehensive circular polarization.

[0050] Please see Figure 2 In some embodiments of this application, the first branch 121 has an open annular structure. The first branch 121 includes a first end 1213 and a second end 1214. The first end 1213 and the second end 1214 are spaced apart to form an opening. The power supply point of the first branch 121 is located at the first end 1213 or the second end 1214.

[0051] When the first branch 121 is an open annular structure, such as a U-shaped, V-shaped, C-shaped, or G-shaped structure, improper setting of the feed point may affect the angular range for achieving circular polarization in the annular direction.

[0052] In this embodiment, the first stub 121 includes a first end 1213 and a second end 1214, which are the two ends constituting the open annular structure of the first stub 121. The feed point is set at either the first end 1213 or the second end 1214. When an electrical signal is applied to one end, the current will start from that feed point and flow along the annular structure of the first stub 121. This choice of starting point is beneficial for guiding the current to form a specific annular flow pattern. The formation of the annular current is the core step in realizing the annular antenna mode. It makes the electromagnetic field distribution around the antenna exhibit a unique pattern of an annular antenna when the antenna is working, giving it good omnidirectional radiation and thus ensuring the effect of omnidirectional circular polarization.

[0053] Please see Figure 1 In some embodiments of this application, the first branch 121 is disposed on one side of the wearable device in the circumferential direction. Since the wearable device usually has a screen 2 on the front, disposing the first branch 121 on one side of the wearable device in the circumferential direction avoids spatial conflict with the front screen 2, making the internal space layout of the device more compact and reasonable. Within the limited space, more space is left for other components, which helps to improve the overall performance and functional integration of the device. In addition, it can also ensure the stable performance of the second antenna 12 and even the entire antenna system, achieving efficient signal radiation and reception.

[0054] Please see Figure 1 and Figure 3 In some embodiments of this application, the wearable device includes a mid-frame 5, and a first branch 121 is disposed on the mid-frame 5.

[0055] The mid-frame (5) is a common component in the overall construction of wearable devices. Taking smartwatches as an example, the mid-frame (5) is the intermediate frame structure connecting the front of the watch face and the watch band. It is usually made of materials such as metal and plastic, and not only provides the basic supporting structure for the entire watch, firmly combining the internal core components such as the screen (2), motherboard (3), and battery (4), but also plays a role in protecting the internal components from external impacts and pressure damage. At the same time, the appearance design of the mid-frame (5) also has a significant impact on the overall aesthetics and texture of the smartwatch.

[0056] In this embodiment, the first branch 121 is disposed on the middle frame 5. Specifically, a portion of the middle frame 5 can be used as the first branch 121, or a portion that can serve as the first branch 121 can be added to the middle frame 5. For example, the first branch 121 can be placed on the side decorative part of the watch's middle frame 5, and it can be achieved using nano-injection molding (NMT) or any other process that can form a good conductor. By using the middle frame 5 to set the first branch 121, the complex support and fixing structure is avoided from being designed and manufactured separately, greatly reducing the number of parts. In the manufacturing process, this reduces raw material procurement costs, simplifies the assembly process, and improves production efficiency.

[0057] In some embodiments of this application, the perimeter of the first stub 121 is half the operating wavelength of the second antenna 12. The operating wavelength refers to the distance traveled by the electromagnetic wave emitted or received by the antenna during a complete propagation cycle in space. In this embodiment, the perimeter of the first stub 121 is half the operating wavelength of the second antenna 12. This half-wavelength design helps to form a more ideal radiation pattern, exhibits excellent polarization characteristics, makes it easier to achieve circular polarization, and to a certain extent widens the operating bandwidth of the loop antenna, effectively improving the radiation efficiency of the first stub 121.

[0058] In some embodiments of this application, both the first antenna 11 and the first stub 121 operate in the L5 band. The L5 band refers to a specific frequency band with a frequency range of approximately 1176.45MHz, primarily used for satellite navigation. Satellites transmit L5 band signals, and ground receiving equipment calculates its own position by measuring the time difference of arrival of multiple satellite signals, combining this with the satellite positions, and applying the principle of triangulation. Accurate positioning plays a crucial role in wearable devices such as smartwatches and smart bracelets. In this embodiment, by using the L5 band for both the first antenna 11 and the first stub 121, near-omnidirectional circular polarization can be achieved in the L5 band, thereby ensuring the positioning accuracy of the wearable device.

[0059] Furthermore, the half wavelength of the L5 band is approximately 12.75 centimeters, which is exactly the size of the circumference of the first branch 121 of the second antenna 12 placed on a wearable device such as a smartwatch or smart bracelet. In other words, the antenna design of this application embodiment can effectively improve the antenna performance while fully meeting the antenna size requirements.

[0060] Please see Figure 4In some embodiments of this application, the wearable device includes a motherboard 3, which serves as a first antenna 11. The motherboard 3 is typically composed of a large-area printed circuit board (PCB), which is covered with various electronic components and circuit traces. These metallic circuit traces and the copper foil layer of the PCB itself have good conductivity, enabling them to act as both radiating and receiving elements of the antenna. In this embodiment, utilizing the motherboard 3 as the first antenna 11 effectively simplifies the structure and makes the internal space layout of the device more compact and rational.

[0061] Please see Figure 3 , Figure 3 The wearable device shown is a smartwatch, with a frame 5 around its perimeter. From top to bottom, the screen 2, motherboard 3, and battery 4 are all contained within the frame 5. The motherboard 3 houses an antenna matching unit 31 and a wireless transceiver 32. Additionally, as is common with flip-up smartwatches, a base 6 may also be present, which can be made of plastic or metal. The antenna matching unit 31 can be directly electrically connected to the antenna, or it can be coupled and fed through a capacitor. The motherboard 3 acts as the first antenna 11, and one side of the frame 5 serves as the second antenna, featuring a ring-shaped or nearly ring-shaped first branch. Because the motherboard 3 is laid flat, the first branch is naturally perpendicular to the motherboard 3, allowing for approximately omnidirectional circular polarization radiation.

[0062] In other embodiments of this application, the first antenna 11 may be a rod-shaped structure, a rectangular structure, or a spiral structure, etc. For example, Figure 1 In the illustrated embodiment, the first antenna 11 has a rod-shaped structure. This rod-shaped structure provides uniform circumferential radiation, better achieving uniform circular polarization in the circumferential direction. The relative positions of the first antenna 11 and the second antenna 12 can be arranged according to the layout requirements of the wearable device. Besides... Figure 1 In addition to forming a T-shape as shown, it can also be like... Figure 5 As shown, it forms a sickle shape; or as Figure 6 The diagram shows a cross shape; other shapes or positional relationships are not listed here.

[0063] Please see Figure 2 In some embodiments of this application, the second antenna 12 includes a second stub 122 connected to the first stub 121, and the operating frequency band of the second stub 122 is different from the operating frequency band of the first stub 121. Wearable devices may include frequency bands for cellular communication (2 / 3 / 4G / 5G), WiFi (2.4 / 5.8GHz), Bluetooth (2.4GHz), positioning (L1 / L5), satellite communication, etc.

[0064] In this embodiment, a second branch 122 is also connected to the first branch 121. The second branch 122 and the first branch 121 each operate at different frequency bands, which are determined based on actual communication needs and application scenarios. Thus, the wearable device of this embodiment achieves a multi-band shared antenna design without increasing size, and the performance of different frequency bands meets the requirements. Figure 2 As shown, the second branch 122 can be bent and is positioned between the first segment 1211 and the second segment 1212 of the first branch 121, thereby saving space.

[0065] In some embodiments of this application, the operating frequency band of the second stub 122 includes at least two WiFi frequency bands. For example, the operating frequency band of the second stub 122 may include coverage of both the 2.4GHz and 5.8GHz WiFi bands. Combined with the operating frequency bands of the first antenna 11 and the first stub 121, the wearable device's antenna can cover three frequency bands, thereby significantly saving antenna space.

[0066] Please see Figure 7 , Figure 7 The figure shows the L5 band radiation pattern formed by the first branch 121 of the first antenna 11 and the second antenna 12 of the wearable device in the embodiment of this application. As can be seen from the figure, the wearable device can achieve a near omnidirectional circular polarization effect in the L5 band.

[0067] Table 1 below is an antenna efficiency table of an embodiment of this application, and Table 2 is an antenna polarization characteristic table of an embodiment of this application.

[0068] Table 1:

[0069] Phi\Theta 0 30 60 90 120 150 180 0 -16.43 -16.1 -13.84 -15.37 -18.59 -38.75 -38.75 30 -19.13 -16.55 -16.96 -18.96 -24.99 -38.75 -38.75 60 -16.41 -24.2 -19.36 -14.94 -16.79 -38.75 -38.75 90 -16.3 -29.83 -23.17 -15.35 -17.57 -38.75 -38.75 120 -16.3 -22.5 -21.04 -16.47 -15.86 -16.79 -38.75 150 -16.3 -14.42 -12.45 -14.1 -15.92 -16.47 -38.75 180 -16.4 -14.71 -12.81 -14.4 -15.67 -38.75 -38.75 210 -16.4 -12.91 -10.55 -10.66 -11.77 -14.94 -38.75 240 -16.3 -11.86 -9.28 -9.65 -10.99 -15.16 -38.75 270 -16.54 -11.86 -8.8 -9.56 -11.81 -16.78 -38.75 300 -16.5 -12.4 -9.42 -10.5 -15.94 -19.54 -38.75 330 -16.5 -13.86 -11.2 -12.78 -15.94 -23.74 -38.75 360 -16.43 -16.1 -13.84 -15.37 -18.59 -38.75 -38.75

[0070] Table 2:

[0071] Phi\Theta 0 30 60 90 120 150 180 0 1 1 1 1 1 -1 -1 30 1 1 1 1 1 -1 -1 60 1 1 1 1 1 -1 -1 90 1 1 1 1 1 -1 -1 120 1 1 1 1 1 -1 -1 150 1 1 1 1 1 -1 -1 180 1 1 1 1 1 -1 -1 210 1 1 1 1 1 -1 -1 240 1 1 1 1 1 -1 -1 270 1 1 1 1 1 -1 -1 300 1 1 1 1 1 -1 -1 330 1 1 1 1 1 -1 -1 360 1 1 1 1 1 -1 -1

[0072] In Table 2, "1" indicates right-hand circular polarization with an axial ratio ≤ 10 and RHCP > LHCP; "-1" indicates left-hand circular polarization with an axial ratio ≤ 10 and LHCP > RHCP; and "0" indicates linear polarization with an axial ratio ≥ 10. As can be seen from Table 1, the antenna of the wearable device in this embodiment has high efficiency in most directions. As can be seen from Table 2, the antenna of this wearable device can achieve near-omnidirectional circular polarization.

[0073] Please see Figure 8 and Figure 9 , Figure 8 The simulated standing wave curve of the antenna in the wearable device in this application embodiment shows that the antenna meets the requirements of three frequency bands: L5 band (approximately 1.2GHz), WiFi 2.4GHz, and 5.8GHz. Figure 9 The antenna simulation efficiency curves of the wearable device in this application embodiment show that the antenna has high efficiency in the L5 band (approximately 1.2 GHz), WiFi 2.4 GHz, and 5.8 GHz.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wearable device, characterized in that, The wearable device includes: First antenna; the first antenna is parallel to the front of the wearable device; The second antenna includes a first stub that extends along a circular trajectory perpendicular to the first antenna. Circularly polarized radiation is generated when the first antenna and the first stub are subjected to excitations of equal amplitude and a phase difference of 90°.

2. The wearable device as described in claim 1, characterized in that, The first branch includes a first segment and a second segment, which are connected to each other. The first segment is located on the side closer to the front of the wearable device, and the second segment is located on the side closer to the back of the wearable device.

3. The wearable device as described in claim 1, characterized in that, The first branch has an open annular structure, the first branch includes a first end and a second end, the first end and the second end are spaced apart to form the opening, and the power supply point of the first branch is located at the first end or the second end.

4. The wearable device as described in claim 1, characterized in that, The first branch is located on one side of the wearable device in the circumferential direction.

5. The wearable device as described in claim 4, characterized in that, The wearable device includes a mid-frame, and the first branch is disposed on the mid-frame.

6. The wearable device according to any one of claims 1-5, characterized in that, The perimeter of the first stub is half the operating wavelength of the first stub.

7. The wearable device as described in claim 5, characterized in that, Both the first antenna and the first stub operate in the L5 frequency band.

8. The wearable device according to any one of claims 1-5, characterized in that, The wearable device includes a motherboard, which serves as the first antenna; or, the first antenna is a rod-shaped structure, a rectangular structure, or a spiral structure.

9. The wearable device according to any one of claims 1-5, characterized in that, The second antenna includes a second stub connected to the first stub, and the operating frequency band of the second stub is different from that of the first stub.

10. The wearable device as claimed in claim 9, characterized in that, The second branch operates in frequency bands including at least two WiFi bands.

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