Circularly polarized antenna and wearable device
By combining loop antennas and monopole antennas, the problem of circular polarization characteristics of wearable device circular polarization antennas at specific angles is solved, achieving circular polarization characteristics and efficient radiation over a wide angle range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG XIAOTIANCAI TECH CO LTD
- Filing Date
- 2025-04-03
- Publication Date
- 2026-04-14
AI Technical Summary
Existing wearable device circularly polarized antennas can only exhibit circular polarization characteristics at specific angles, and cannot maintain circular polarization characteristics over a wide angle range or at any angle.
The design employs a combination of a loop antenna and a monopole antenna connected by a feed element. The electric and magnetic field directions of the loop antenna and the monopole antenna are interchanged, and they are 90° apart at any angle in space, forming a circularly polarized antenna.
This technology enables circularly polarized antennas to maintain their circular polarization characteristics over a wide angle range and even at arbitrary angles, thereby improving radiation efficiency and reducing stray radiation and electromagnetic leakage.
Smart Images
Figure CN224123516U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of antenna technology, and more particularly to a circularly polarized antenna and wearable device. Background Technology
[0002] In wireless communication systems, antennas are key components for signal transmission and reception. With the development of wireless communication technology, applications such as wireless data communication and acquisition are becoming increasingly widespread. People have higher and higher requirements for the positioning of wireless transceiver devices, as well as for the circular polarization characteristics of antennas. Therefore, circularly polarized antennas are receiving more and more research and application.
[0003] To improve antenna performance, current wearable devices typically include circularly polarized antennas. Circularly polarized antennas can receive not only circularly polarized electromagnetic waves of the same rotation direction, but also electromagnetic waves of arbitrary linear polarization. Furthermore, the electromagnetic waves radiated by these antennas can be received by either circularly polarized antennas of the same rotation direction or antennas of arbitrary linear polarization.
[0004] However, currently, circularly polarized antennas in wearable devices only exhibit circular polarization characteristics at specific angles in space. Utility Model Content
[0005] This application discloses a circularly polarized antenna and a wearable device, which enables the circularly polarized antenna to exhibit circular polarization characteristics over a wide angle range or even at any angle.
[0006] To achieve the above objectives, in a first aspect, embodiments of this application disclose a circularly polarized antenna for use in wearable devices, comprising:
[0007] Feeder;
[0008] Monopole antenna;
[0009] A loop antenna, wherein the loop antenna and the monopole antenna are connected through the feed body;
[0010] The loop antenna and the monopole antenna work together to form the circularly polarized antenna.
[0011] In one alternative embodiment, the loop antenna has an opening and a first end and a second end disposed near the opening, one of the first end and the second end being connected to the feed element.
[0012] In one optional embodiment, the loop antenna includes a first radiating arm, a second radiating arm, and a connecting arm, wherein the first radiating arm and the second radiating arm are spaced apart.
[0013] One end of the connecting arm is connected to the first end of the first radiating arm, and the other end of the connecting arm is connected to the first end of the second radiating arm. The feed body is connected to the first radiating arm or the second radiating arm.
[0014] In one alternative embodiment, along the arrangement direction of the first and second radiating arms, the maximum width of the first radiating arm is greater than the maximum width of the second radiating arm.
[0015] In an alternative embodiment, the feeder is connected to the second end of the first radiating arm.
[0016] In one optional embodiment, the loop antenna is arranged at an angle to the monopole antenna, and the loop antenna is located on one side of the monopole antenna. Along a first direction, the loop antenna bends away from the monopole antenna.
[0017] Wherein, the first direction is perpendicular to the arrangement direction of the first radiating arm and the second radiating arm, and the first direction is perpendicular to the length direction of the first radiating arm.
[0018] In one alternative embodiment, the monopole antenna is a circuit board of a wearable device, one end of the feed element is connected to the circuit board, and the other end of the feed element is connected to the loop antenna.
[0019] In one alternative embodiment, the loop antenna is configured as a metal decorative element of the wearable device.
[0020] In one optional embodiment, the circularly polarized antenna further includes a circuit board, one end of the feed body is connected to the circuit board, and the other end of the feed body is connected to the loop antenna and the monopole antenna, respectively.
[0021] Secondly, this application provides a wearable device including the circularly polarized antenna described in any of the above embodiments.
[0022] In one optional embodiment, the wearable device includes a mid-frame, the monopole antenna is a circuit board of the wearable device, and the loop antenna is a metal decorative element of the wearable device;
[0023] The middle frame is injection molded inside the metal decorative part. The circuit board and the power supply are both located inside the middle frame. One end of the power supply is connected to the circuit board, and the other end is connected to the metal decorative part.
[0024] In one optional embodiment, the metal decorative element includes a first radiating arm, a second radiating arm, and a connecting arm, wherein the first radiating arm and the second radiating arm are spaced apart.
[0025] One end of the connecting arm is connected to the first end of the first radiating arm, and the other end of the connecting arm is connected to the first end of the second radiating arm. The feed body is connected to the first radiating arm or the second radiating arm.
[0026] Compared with related technologies, the beneficial effects of this application are:
[0027] In this application, the circularly polarized antenna includes a feed element, a loop antenna, and a monopole antenna. The loop antenna and the monopole antenna are connected through the feed element, and the loop antenna and the monopole antenna cooperate to form a circularly polarized antenna. Since the radiation pattern of the loop antenna in this application is the same as that of the monopole antenna, but the directions of their electric and magnetic fields are interchanged, for example, the direction of the magnetic field of the loop antenna is the direction of the electric field of the monopole antenna, and vice versa. At the same time, the phase of the electric field of the loop antenna and the electric field of the monopole antenna is 90° at any angle in space. In summary, the electromagnetic field radiated by the circularly polarized antenna of this application exhibits circular polarization characteristics over a large angle range and even at any spatial angle. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments 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.
[0029] Figure 1 This is a partial structural schematic diagram of the wearable device disclosed in the embodiments of this application;
[0030] Figure 2 This is a schematic diagram of the structure of the circularly polarized antenna disclosed in the embodiments of this application. Figure 1 ;
[0031] Figure 3 This is a schematic diagram of the structure of the circularly polarized antenna disclosed in the embodiments of this application. Figure 2 ;
[0032] Figure 4 This is a schematic diagram of the loop antenna structure disclosed in an embodiment of this application;
[0033] Figure 5 This is a schematic diagram of the structure of a circularly polarized antenna disclosed in another embodiment of this application;
[0034] Figure 6 and Figure 7 For this application Figure 5 The diagram shows the combination of the monopole antenna and the loop antenna in different positions in the circularly polarized antenna shown.
[0035] Figure 8This is an S11 curve diagram of the circularly polarized antenna disclosed in the embodiments of this application;
[0036] Figure 9 This is an efficiency curve of the circularly polarized antenna disclosed in the embodiments of this application;
[0037] Figure 10 This is the radiation pattern of the circularly polarized antenna disclosed in the embodiments of this application;
[0038] Figure 11 This is an aspect ratio diagram of the circularly polarized antenna disclosed in the embodiments of this application.
[0039] Explanation of reference numerals in the attached figures:
[0040] 100. Power supply element;
[0041] 200. Monopole antenna;
[0042] 300, loop antenna; 301, opening; 310, first radiating arm; 320, second radiating arm; 330, connecting arm;
[0043] 400. Circuit board;
[0044] 500, middle frame. Detailed Implementation
[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0046] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0047] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0048] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0049] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.
[0050] In wireless communication systems, antennas are key components for signal transmission and reception. With the development of wireless communication technology, applications such as wireless data communication and acquisition are becoming increasingly widespread. Wireless transceiver devices are trending towards miniaturization, thus circularly polarized antennas are receiving more and more research and application.
[0051] To improve antenna performance, current wearable devices typically include circularly polarized antennas. Circularly polarized antennas can receive not only circularly polarized electromagnetic waves of the same rotation direction, but also electromagnetic waves of arbitrary linear polarization. Furthermore, the electromagnetic waves radiated by these antennas can be received by either circularly polarized antennas of the same rotation direction or antennas of arbitrary linear polarization.
[0052] However, current circularly polarized antennas in wearable devices only exhibit circular polarization characteristics at specific angles in space. The inventors discovered that current circularly polarized antennas in wearable devices consist of two monopole antennas, vertically positioned. These two monopole antennas work together to form a circularly polarized antenna. However, the amplitudes of the two monopole antennas are not equal at certain angles, and their phase difference also changes. In other words, the electric fields generated by the two monopole antennas can only satisfy the condition of equal amplitude and a 90-degree phase difference at specific angles. Therefore, it is evident that current circularly polarized antennas formed by two monopole antennas can only achieve circular polarization characteristics at specific angles.
[0053] This application discloses a circularly polarized antenna and a wearable device, which enables the circularly polarized antenna to exhibit circular polarization characteristics over a wide angle range or even at any angle.
[0054] The circularly polarized antenna and wearable device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.
[0055] like Figures 1 to 4As shown in the figure, this application discloses a circularly polarized antenna for wearable devices, including a feed element 100, a monopole antenna 200, and a loop antenna 300. The loop antenna 300 and the monopole antenna 200 are connected through the feed element 100, and the loop antenna 300 and the monopole antenna 200 cooperate to form a circularly polarized antenna. Specifically, when the loop antenna 300 and the monopole antenna 200 resonate at the operating frequency band, the operating frequency band can be the GPS (Global Positioning System) L1 band 1575.42±1.023MHz, or the L5 band 1176.45±1.023MHz, etc. This application does not limit the operating frequency band of the circularly polarized antenna; other frequency bands, such as the BeiDou band, can also be used.
[0056] The electrical signals of the loop antenna 300 and the monopole antenna 200 satisfy the condition that their resonant amplitudes are equal and their resonant phases differ by 90 degrees, thus satisfying the circular polarization characteristics. Because the loop antenna 300 has a relatively long length, which can be half the operating wavelength of the circularly polarized antenna, the circularly polarized antenna formed by this loop antenna 300 has high radiation efficiency.
[0057] In this application, the circularly polarized antenna includes a feed element 100, a loop antenna 300, and a monopole antenna 200. The loop antenna 300 and the monopole antenna 200 are connected through the feed element 100. The loop antenna 300 and the monopole antenna 200 cooperate to form a circularly polarized antenna. Since the radiation pattern of the loop antenna 300 and the radiation pattern of the monopole antenna 200 are the same, but the directions of their electric and magnetic fields are interchanged, for example, the direction of the magnetic field of the loop antenna 300 is the direction of the electric field of the monopole antenna 200, and vice versa. At the same time, the phase of the electric field of the loop antenna 300 and the electric field of the monopole antenna 200 is 90° at any angle in space. In summary, the electromagnetic field radiated by the circularly polarized antenna of this application exhibits circular polarization characteristics over a large angle range or even at any spatial angle.
[0058] When the circularly polarized antenna of this application is placed inside a wearable device, the loop antenna 300 can be placed on any side of the smartwatch, such as the top, bottom, left, or right side, and this application does not impose any restrictions on this.
[0059] In one alternative embodiment, the loop antenna 300 has an opening 301 and a first end and a second end disposed near the opening 301, one of which is connected to the feed body 100. Exemplarily, the shape of the loop antenna 300 can be C-shaped, U-shaped, V-shaped, G-shaped, etc., and this application does not limit the specific shape of the loop antenna 300.
[0060] In this embodiment, the loop antenna 300 has an opening 301. The feed body 100 is connected to one end of the loop antenna 300 near the opening. This allows current to be directly transmitted from the feed body 100 to one end of the loop antenna 300, and then along the loop antenna 300 to the other end. This configuration ensures a defined current transmission path, which reduces stray radiation and electromagnetic leakage generated by the loop antenna 300 during operation. This improves the circular polarization performance of the circularly polarized antenna formed by the loop antenna 300 and the monopole antenna 200. Alternatively, the loop antenna 300 may not have an opening 301, in which case the loop antenna 300 is a closed structure in its circumference.
[0061] In one alternative embodiment, such as Figures 2 to 4 As shown, the loop antenna 300 includes a first radiating arm 310, a second radiating arm 320, and a connecting arm 330. The first radiating arm 310 and the second radiating arm 320 are spaced apart. One end of the connecting arm 330 is connected to the first end of the first radiating arm 310, and the other end of the connecting arm 330 is connected to the first end of the second radiating arm 320. The feed element 100 is connected to either the first radiating arm 310 or the second radiating arm 320. For example, the feed element 100 can be connected to the first radiating arm 310, and the junction of the feed element 100 and the first radiating arm 310 can be located at the end of the first radiating arm 310 near the connecting arm 330, at the end of the first radiating arm 310 away from the connecting arm 330, or at the middle of the first radiating arm 310 along its length. Of course, the feed body 100 can be connected to the second radiating arm 320, and the junction of the feed body 100 and the second radiating arm 320 can be located at one end of the second radiating arm 320 near the connecting arm 330, or at one end of the second radiating arm 320 away from the connecting arm 330, or at the middle of the second radiating arm 320 along its own length direction.
[0062] In this embodiment, the first radiating arm 310 and the second radiating arm 320 are spaced apart. One end of the connecting arm 330 is connected to the first end of the first radiating arm 310, and the other end of the connecting arm 330 is connected to the first end of the second radiating arm 320. This allows the second ends of the first radiating arm 310 and the second ends of the second radiating arm 320 to form an opening 301. Thus, after the feed body 100 is connected to the first radiating arm 310 and the second radiating arm 320, the current transmission path is determined. The determined current transmission path can reduce stray radiation and electromagnetic leakage generated by the loop antenna 300 during operation, which can improve the circular polarization performance of the circularly polarized antenna formed by the loop antenna 300 and the monopole antenna 200.
[0063] For example, the first radiating arm 310 and the second radiating arm 320 can be parallel to each other, and the connecting arm 330 can be arranged perpendicular to the first radiating arm 310 and the second radiating arm 320 respectively. The arrangement direction of the first radiating arm 310 and the second radiating arm 320 can be perpendicular to the circuit board 400.
[0064] In one alternative embodiment, such as Figure 4 As shown, along the arrangement direction of the first radiating arm 310 and the second radiating arm 320, the maximum width of the first radiating arm 310 is greater than the maximum width of the second radiating arm 320.
[0065] When the circularly polarized antenna of this embodiment is applied to a wearable device, the arrangement direction of the second radiating arm 320 can be parallel to the thickness direction of the wearable device, and the first radiating arm 310 is located on the skin-far side of the second radiating arm 320. That is, the first radiating arm 310 is further away from the user setting than the second radiating arm 320.
[0066] Since the maximum width of the first radiating arm 310 in this embodiment is greater than the maximum width of the second radiating arm 320, the current intensity on the first radiating arm 310 is greater than the current intensity on the second radiating arm 320 when the circularly polarized antenna is working. In other words, the first radiating arm 310 is the main radiating part of the circularly polarized antenna. Positioning the main radiating part of the circularly polarized antenna away from the user reduces interference and absorption of electromagnetic waves generated by the main radiating part of the antenna by the human body, thereby improving the antenna's radiation efficiency and ensuring that more energy is radiated in the form of electromagnetic waves. Of course, the maximum width of the first radiating arm 310 can also be less than or equal to the maximum width of the second radiating arm 320; this application does not impose any limitation on this.
[0067] In a further embodiment, the minimum width of the first radiating arm 310 is greater than the maximum width of the second radiating arm 320.
[0068] In an alternative embodiment, the feeder 100 is connected to the second end of the first radiating arm 310.
[0069] In this embodiment, since the maximum width of the first radiating arm 310 is greater than the maximum width of the second radiating arm 320 along the arrangement direction of the first radiating arm 310 and the second radiating arm 320, the wider first radiating arm 310 can carry more current. Therefore, when the feed body 100 is connected to the first radiating arm 310, the current can be transmitted more effectively on the first radiating arm 310, improving the radiation efficiency of the circularly polarized antenna. Of course, the feed body 100 can also be connected to the second end of the second radiating arm 320, and this application does not limit this.
[0070] In one optional embodiment, the loop antenna 300 and the monopole antenna 200 are arranged at an angle, that is, the plane where the loop antenna 300 is located is arranged at an angle to the monopole antenna 200. For example, the angle between the loop antenna 300 and the monopole antenna 200 can be a right angle, an obtuse angle or an acute angle. This application does not limit this, as long as the two can form a circularly polarized antenna when they are combined. The loop antenna 300 is located on one side of the monopole antenna 200. Along the first direction, the loop antenna 300 bends away from the monopole antenna 200. The first direction is perpendicular to the arrangement direction of the first radiating arm 310 and the second radiating arm 320, and the first direction is perpendicular to the length direction of the first radiating arm 310.
[0071] In this embodiment, when the circularly polarized antenna is applied to a wearable device, the first direction is parallel to the display screen of the wearable device, and the monopole antenna 200 and the display screen are stacked along the thickness direction of the wearable device. The loop antenna 300 is located on one side of the display screen. Therefore, in this embodiment, the loop antenna 300 is bent away from the monopole antenna 200, which is equivalent to the loop antenna 300 being bent away from the display screen. This can increase the distance between the loop antenna 300 and the display screen, thereby reducing the signal interference of the display screen to the loop antenna 300.
[0072] In one alternative embodiment, the monopole antenna 200 is the circuit board 400 of the wearable device, one end of the feed element 100 is connected to the circuit board 400, and the other end of the feed element 100 is connected to the loop antenna 300. Specifically, the circuit board 400 of the wearable device is responsible for user interaction, power management, signal processing, storage and computing, connecting to external devices, and driving the display screen, ensuring the normal operation of the watch and providing various functions.
[0073] In this embodiment, the circuit board 400 is an essential component inside the wearable device. Using the circuit board 400 as the monopole antenna 200 makes full use of existing space, eliminating the need for additional space inside the wearable device to install a separate monopole antenna 200. This results in a more compact design for the wearable device, contributing to its thinner and lighter design. Furthermore, by using the circuit board 400 of the wearable device as the monopole antenna 200, there is no need to additionally install a monopole antenna 200, which reduces the manufacturing cost of the wearable device.
[0074] In one alternative embodiment, the loop antenna 300 is configured as a metal decorative element for the wearable device. Specifically, the wearable device includes a mid-frame 500, which is injection molded within the metal decorative element. The mid-frame 500 provides a mounting base for components such as the display screen, battery, and circuit board 400. The metal decorative element provides a good aesthetic appeal to the wearable device and has high structural strength, enabling it to protect the mid-frame 500 and the components within it.
[0075] In this embodiment, the loop antenna 300 is designed as a metal decorative component. This fully utilizes the external space of the wearable device, eliminating the need for additional internal space to install the loop antenna 300. This results in a more compact design for the wearable device, contributing to its thinner and lighter form factor. Furthermore, by using the loop antenna 300 as a metal decorative component, no additional metal decorative components are required, reducing the manufacturing cost of the wearable device.
[0076] In other embodiments, such as Figure 5 As shown, the circuit board 400 may not serve as the monopole antenna 200 of the circularly polarized antenna. In this case, the circularly polarized antenna still includes the circuit board 400. One end of the feed element 100 is connected to the circuit board 400, and the other end of the feed element 100 is connected to both the loop antenna 300 and the monopole antenna 200. For example, the monopole antenna 200 can be rod-shaped, rectangular, spiral-shaped, or other shapes. The monopole antenna 200 can be combined with the loop antenna 300 to form a configuration such as... Figure 6 As shown in the T-shape, the end of the monopole antenna 200 is connected to the middle of the loop antenna 300 along its own length; or the monopole antenna 200 can be combined with the loop antenna 300 to form a T-shape. Figure 7 The cross shape shown indicates that the monopole antenna 200 is connected to the middle of the loop antenna 300 along its own length direction at the same point.
[0077] Please see Figure 8 , Figure 8 It is the S11 curve of a circularly polarized antenna, from Figure 8 It can be seen that the circularly polarized antenna resonates at 1176MHz in the L5 band of GPS, and S11 is less than -19dB in the 1176±2MHz band, indicating good reception of navigation satellite signals.
[0078] Please see Figure 9 , Figure 9 It is the efficiency curve of a circularly polarized antenna, from Figure 9 As can be seen, the circularly polarized antenna has a total efficiency of -12.8dB at the resonant frequency, which is good.
[0079] Please see Figure 10 , Figure 10 It is the radiation pattern of a circularly polarized antenna, from Figure 10 It can be seen that the directivity coefficient of this circularly polarized antenna at the resonant frequency is 4.232 dBi, which is higher than that of antennas of the same type.
[0080] Please see Figure 11 and the table below, Figure 11This is the axial ratio diagram for a circularly polarized antenna. The table below shows the measured axial ratio performance. "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; "0" indicates linear polarization, with an axial ratio ≥ 10 indicating linear polarization. Figure 11 As can be seen from the table below, the axial ratio of this circularly polarized antenna is <10 at most angles in space, and it exhibits circular polarization characteristics.
[0081]
[0082] This application also discloses a wearable device including the circularly polarized antenna described in any of the above embodiments. In this application, the circularly polarized antenna includes a feed element 100, a loop antenna 300, and a monopole antenna 200. The loop antenna 300 and the monopole antenna 200 are connected through the feed element 100. The loop antenna 300 and the monopole antenna 200 cooperate to form a circularly polarized antenna. The electric field distribution of the loop antenna 300 is relatively consistent in all directions. Therefore, the electric fields generated by the loop antenna 300 and the monopole antenna 200 can satisfy equal amplitude and a 90-degree phase difference over a large angular range, and even at any angle, they can satisfy equal amplitude and a 90-degree phase difference. It is evident that the circularly polarized antenna using this application can exhibit circular polarization characteristics over a large angular range or even at any angle.
[0083] In one optional embodiment, the wearable device includes a mid-frame 500, a monopole antenna 200 which is the circuit board 400 of the wearable device, and a loop antenna 300 which is the metal decorative part of the wearable device. The mid-frame 500 is injection molded inside the metal decorative part. The circuit board 400 and the feed body 100 are both disposed inside the mid-frame 500. One end of the feed body 100 is connected to the circuit board 400, and the other end is connected to the metal decorative part.
[0084] In this embodiment, the circuit board 400 is an essential component inside the wearable device. Using the circuit board 400 as the monopole antenna 200 makes full use of existing space, eliminating the need for additional internal space to install a separate monopole antenna 200. This results in a more compact design and contributes to the thinner and lighter design of the wearable device. Furthermore, by using the circuit board 400 as the monopole antenna 200, no additional monopole antenna 200 is required, reducing manufacturing costs. Additionally, this embodiment designs the loop antenna 300 as a metal decorative element, making full use of the external space of the wearable device. No additional internal space is needed to install the loop antenna 300, further enhancing the compact design and contributing to a thinner and lighter design. Moreover, by using the loop antenna 300 as a metal decorative element, no additional metal decorative element is required, further reducing manufacturing costs.
[0085] In one optional embodiment, the metal decorative element includes a first radiating arm 310, a second radiating arm 320, and a connecting arm 330, with the first radiating arm 310 and the second radiating arm 320 spaced apart. For example, the first radiating arm 310 and the second radiating arm 320 may be spaced apart along the thickness direction of the wearable device, which is perpendicular to the display surface of the wearable device's screen.
[0086] One end of the connecting arm 330 is connected to the first end of the first radiating arm 310, and the other end of the connecting arm 330 is connected to the first end of the second radiating arm 320. The power supply 100 is connected to the first radiating arm 310 or the second radiating arm 320.
[0087] In this embodiment, the first radiating arm 310 and the second radiating arm 320 are spaced apart. One end of the connecting arm 330 is connected to the first end of the first radiating arm 310, and the other end of the connecting arm 330 is connected to the first end of the second radiating arm 320. This allows the second ends of the first radiating arm 310 and the second ends of the second radiating arm 320 to form an opening 301. Thus, after the feed body 100 is connected to the first radiating arm 310 and the second radiating arm 320, the current transmission path is determined. The determined current transmission path can reduce stray radiation and electromagnetic leakage generated by the loop antenna 300 during operation, which can improve the circular polarization performance of the circularly polarized antenna formed by the loop antenna 300 and the monopole antenna 200.
[0088] The foregoing embodiments of this application focus on describing the differences between various embodiments. As long as the different optimization features between embodiments are not contradictory, they can be combined to form better embodiments. For the sake of brevity, these differences will not be elaborated upon here. The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make many modifications without departing from the spirit and scope of the claims, all of which fall within the protection scope of this application.
Claims
1. A circularly polarized antenna for use in wearable devices, characterized in that, include: Feeder (100); Monopole antenna (200); A loop antenna (300) is connected to the monopole antenna (200) via the feed body (100); The loop antenna (300) and the monopole antenna (200) work together to form the circularly polarized antenna.
2. The circularly polarized antenna according to claim 1, characterized in that, The loop antenna (300) has an opening (301) and a first end and a second end disposed near the opening (301), one of the first end and the second end being connected to the feed body (100).
3. The circularly polarized antenna according to claim 1, characterized in that, The loop antenna (300) includes a first radiating arm (310), a second radiating arm (320), and a connecting arm (330), wherein the first radiating arm (310) and the second radiating arm (320) are spaced apart. One end of the connecting arm (330) is connected to the first end of the first radiating arm (310), and the other end of the connecting arm (330) is connected to the first end of the second radiating arm (320). The feed body (100) is connected to the first radiating arm (310) or the second radiating arm (320).
4. The circularly polarized antenna according to claim 3, characterized in that, Along the arrangement direction of the first radiating arm (310) and the second radiating arm (320), the maximum width of the first radiating arm (310) is greater than the maximum width of the second radiating arm (320).
5. The circularly polarized antenna according to claim 4, characterized in that, The feed element (100) is connected to the second end of the first radiating arm (310).
6. The circularly polarized antenna according to claim 3, characterized in that, The loop antenna (300) is set at an angle to the monopole antenna (200), and the loop antenna (300) is located on one side of the monopole antenna (200). Along the first direction, the loop antenna (300) bends away from the monopole antenna (200). The first direction is perpendicular to the arrangement direction of the first radiating arm (310) and the second radiating arm (320), and the first direction is perpendicular to the length direction of the first radiating arm (310).
7. The circularly polarized antenna according to claim 1, characterized in that, The monopole antenna (200) is a circuit board (400) of a wearable device. One end of the feed body (100) is connected to the circuit board (400), and the other end of the feed body (100) is connected to the loop antenna (300).
8. The circularly polarized antenna according to claim 7, characterized in that, The loop antenna (300) is constructed as a metal decorative element for wearable devices.
9. The circularly polarized antenna according to claim 1, characterized in that, The circularly polarized antenna also includes a circuit board (400), one end of the feed body (100) is connected to the circuit board (400), and the other end of the feed body (100) is connected to the loop antenna (300) and the monopole antenna (200) respectively.
10. A wearable device, characterized in that, Includes the circularly polarized antenna as described in any one of claims 1 to 9.
11. The wearable device according to claim 10, characterized in that, The monopole antenna (200) is the circuit board (400) of the wearable device, and the loop antenna (300) is the metal decorative part of the wearable device; The wearable device includes a mid-frame (500) which is injection molded within the metal decorative part. The circuit board (400) and the power supply (100) are both located within the mid-frame (500). One end of the power supply (100) is connected to the circuit board (400), and the other end is connected to the metal decorative part.
12. The wearable device according to claim 11, characterized in that, The metal decorative component includes a first radiating arm (310), a second radiating arm (320), and a connecting arm (330), wherein the first radiating arm (310) and the second radiating arm (320) are spaced apart. One end of the connecting arm (330) is connected to the first end of the first radiating arm (310), and the other end of the connecting arm (330) is connected to the first end of the second radiating arm (320). The feed body (100) is connected to the first radiating arm (310) or the second radiating arm (320).