Circularly polarized antenna and wearable electronic equipment

Abstract

The invention is suitable for the technical field of antennas, and provides a circularly polarized antenna and wearable electronic equipment. The circularly polarized antenna comprises a first arc-shaped radiator, the radian of the first arc-shaped radiator is larger than or equal to 170 degrees and smaller than or equal to 190 degrees, a feeding point is arranged in the middle area of the first arc-shaped radiator, the feeding point is used for being electrically connected with a position determining element, and the first arc-shaped radiator is used for receiving a first circularly polarized signal. According to the circularly polarized antenna provided by the embodiment of the invention, the first arc-shaped radiator is utilized to form the circularly polarized antenna, a complete circular ring radiator does not need to be manufactured, the length of the antenna is reduced, the miniaturization design of the circularly polarized antenna is facilitated, the first arc-shaped radiator can be flexibly designed in the wearable electronic equipment, and the cost is reduced. And the design difficulty of the circularly polarized antenna is reduced.

Description

Circularly polarized antenna and wearable electronic device Technical Field

[0001] The present application belongs to the field of antenna technology, and in particular relates to a circularly polarized antenna and a wearable electronic device. Background Art

[0002] With the rapid development of wireless communication terminal technology, wearable electronic devices have emerged in people's sight. Wearable electronic devices are equipped with circularly polarized antennas for receiving circularly polarized signals, so that wearable electronic devices have positioning functions.

[0003] The circularly polarized antenna in existing wearable electronic devices is set on the watch ring. For non-metallic watch rings, a complete circular metal body needs to be made on the watch ring to form a circularly polarized antenna. However, the small size and complex internal environment of wearable electronic devices make the design of circularly polarized antennas very difficult. Technical issues

[0004] One of the purposes of the embodiments of the present application is to provide a circularly polarized antenna and a wearable electronic device, which can solve the problem of difficulty in designing circularly polarized antennas in wearable electronic devices. Technical Solutions

[0005] In a first aspect, an embodiment of the present application provides a circularly polarized antenna, comprising a first arc-shaped radiator, wherein the curvature of the first arc-shaped radiator is greater than or equal to 170 degrees and less than or equal to 190 degrees, a feeding point is provided in the middle area of ​​the first arc-shaped radiator, and the feeding point is used to be electrically connected to a position determination element, and the first arc-shaped radiator is used to receive a first circularly polarized signal.

[0006] In a possible implementation of the first aspect, a first grounding point is further provided on the first arc-shaped radiator, and the first grounding point is provided in the middle area of ​​the first arc-shaped radiator, and the curvature of the arc between the feeding point and the first grounding point is less than a preset angle.

[0007] In a possible implementation manner of the first aspect, the preset angle is greater than zero degrees and less than 45 degrees.

[0008] In a possible implementation of the first aspect, the circularly polarized antenna further includes a frequency modulation component, which is electrically connected to the first arc radiator, and the frequency modulation component is used to adjust the frequency of the signal received by the first arc radiator so that the first arc radiator can receive the first circularly polarized signal of the first target frequency.

[0009] In a possible implementation of the first aspect, the frequency modulation component includes an inductor, a first end of the inductor is electrically connected to the first arc-shaped radiator, and a second end of the inductor is grounded;

[0010] and / or,

[0011] The frequency modulation component includes a capacitor, a first end of the capacitor is electrically connected to the first arc-shaped radiator, and a second end of the capacitor is grounded.

[0012] In a possible implementation of the first aspect, the circularly polarized antenna further includes a second arc radiator, the second arc radiator and the first arc radiator are arranged at intervals, the second arc radiator and the first arc radiator are located on the same circumference, the arc length between the second end of the second arc radiator and the first end of the first arc radiator is smaller than the arc length between the first end of the second arc radiator and the second end of the first arc radiator, a second grounding point is provided on the second arc radiator, and the second arc radiator and the first arc radiator are used to receive a second circularly polarized signal.

[0013] In a possible implementation of the first aspect, the second arc-shaped radiator and the first radiating portion on the first arc-shaped radiator are used to receive the second circularly polarized signal; wherein the first radiating portion includes a radiator between the feeding point and the first end on the first arc-shaped radiator.

[0014] In a possible implementation manner of the first aspect, an angle of the arc between the first end of the first arc-shaped radiator and the second end of the second arc-shaped radiator on the circumference is greater than or equal to 10 degrees and less than or equal to 30 degrees.

[0015] In a possible implementation manner of the first aspect, the second grounding point is provided at a second end portion of the second arc-shaped radiator.

[0016] In a second aspect, an embodiment of the present application provides a wearable electronic device, comprising a housing, a position determination element, and the circularly polarized antenna according to any one of the first aspects, wherein the housing comprises a bottom wall and a side wall connected to the bottom wall, the circularly polarized antenna is disposed on the side wall, and the position determination element is coupled to the circularly polarized antenna;

[0017] The circularly polarized antenna is used to receive a first circularly polarized signal and transmit the first circularly polarized signal to the position determining element. The position determining element is used to determine a current geographical location according to the first circularly polarized signal. Beneficial effects

[0018] The circularly polarized antenna provided in an embodiment of the present application includes a first arc-shaped radiator, the curvature of the first arc-shaped radiator is greater than or equal to 170 degrees and less than or equal to 190 degrees, a feeding point is provided in the middle area of ​​the first arc-shaped radiator, the feeding point is used to be electrically connected to the position determination element, and the first arc-shaped radiator is used to receive a first circularly polarized signal.

[0019] The circularly polarized antenna provided in the embodiment of the present application utilizes a first arc-shaped radiator to form a circularly polarized antenna. There is no need to make a complete circular ring radiator, which reduces the length of the antenna and is conducive to the miniaturization design of the circularly polarized antenna. The first arc-shaped radiator can be flexibly designed in a wearable electronic device, reducing the design difficulty of the circularly polarized antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] FIG1 is a schematic structural diagram of a circularly polarized antenna provided in one embodiment of the present application;

[0022] 2 is a current distribution diagram on a first arc-shaped radiator when the circularly polarized antenna provided in an embodiment of the present application receives a first frequency signal in a first mode and receives a second frequency signal in a second mode;

[0023] FIG3 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0024] FIG4 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0025] FIG5 is a schematic structural diagram of a circularly polarized antenna provided in another embodiment of the present application;

[0026] Figure 6 is a current distribution diagram on the first arc radiator and the second arc radiator when the circularly polarized antenna provided in an embodiment of the present application receives the third frequency signal in the first mode, the fourth frequency signal in the second mode, and the fifth frequency signal in the third mode.

[0027] In the figure: 100, first arc-shaped radiator; 101, first radiating part; 200, feeding point; 300, position determination element; 400, first grounding point; 500, frequency modulation component; 600, second arc-shaped radiator; 700, second grounding point. Modes for Carrying Out the Invention

[0028] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0029] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0030] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0032] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0034] Figure 1 shows a schematic diagram of the structure of a circularly polarized antenna provided by one embodiment of the present application. As shown in Figure 1 , the circularly polarized antenna includes a first arc-shaped radiator 100 , whose arc angle is greater than or equal to 170 degrees and less than or equal to 190 degrees. A feed point 200 is provided in the middle region of the first arc-shaped radiator 100 . The feed point 200 is configured to electrically connect to a position determination element 300 , and the first arc-shaped radiator 100 is configured to receive a first circularly polarized signal.

[0035] Specifically, the curvature of the first arc radiator 100 is designed to be greater than or equal to 170 degrees and less than or equal to 190 degrees, and the feeding point 200 is set in the middle area of ​​the first arc radiator 100, so that the current generated by the first arc radiator 100 when receiving the signal is symmetrical, making it easier for the current generated by the first arc radiator 100 when receiving the first frequency signal in the first mode and the current generated by the first arc radiator 100 when receiving the first frequency signal in the second mode to be nearly perpendicular to each other, with the same amplitude and a frequency difference of 90 degrees, so that it is easy to determine a signal with a frequency between the first frequency and the second frequency, so that the current generated by the first arc radiator 100 when receiving the signal in the first mode and the current generated by the first arc radiator 100 when receiving the signal in the second mode to be nearly perpendicular to each other, with the same amplitude and a frequency difference of 90 degrees, so that the first arc radiator 100 forms a circularly polarized antenna, which can receive the first circularly polarized signal.

[0036] The circularly polarized antenna provided in the embodiment of the present application utilizes the first arc-shaped radiator 100 to form a circularly polarized antenna. There is no need to make a complete circular ring radiator, which reduces the length of the antenna and is conducive to the miniaturization design of the circularly polarized antenna. The first arc-shaped radiator 100 can be flexibly designed in a wearable electronic device, reducing the design difficulty of the circularly polarized antenna.

[0037] It should be noted that the intersection of the perpendicular bisector of the line connecting the two ends of the first arc radiator 100 and the first arc radiator 100 is the midpoint of the first arc radiator 100, and the middle area of ​​the first arc radiator 100 includes the midpoint of the first arc radiator 100 and the area near the midpoint.

[0038] Figure 2 shows the current distribution diagrams on the first curved radiator 100 when the circularly polarized antenna provided in an embodiment of the present application receives a first frequency signal in a first mode and a second frequency signal in a second mode. Figure 2(a) shows the current distribution diagram when the first curved radiator 100 receives the first frequency signal in the first mode. The current on the first curved radiator 100 flows vertically. Figure 2(b) shows the current distribution diagram when the first curved radiator 100 receives the second frequency signal in the second mode. The current on the first curved radiator 100 flows horizontally.

[0039] This indicates that a signal at the first target frequency exists, and the first target frequency lies between the frequencies of the first and second frequency signals. The current generated by the first arc radiator 100 when receiving the signal at the first target frequency in the first mode and the current generated by the first arc radiator 100 when receiving the signal at the first target frequency in the second mode are perpendicular to each other, have the same amplitude, and differ in frequency by 90 degrees. Thus, the first arc radiator 100 forms a circularly polarized antenna capable of receiving signals at the first target frequency.

[0040] For example, when the current on the first curved radiator 100 when receiving a 2.2 GHz signal in the first mode and the current on the first curved radiator 100 when receiving a 1.9 GHz signal in the second mode are perpendicular to each other, have the same amplitude, and differ in frequency by 90 degrees, a signal with a frequency between 2.2 GHz and 1.9 GHz (for example, a signal with a frequency of 2.1 GHz) can be determined. This causes the current on the first curved radiator 100 when receiving a 2.1 GHz signal in the first mode and the current on the first curved radiator 100 when receiving a 2.1 GHz signal in the second mode to be perpendicular to each other, have the same amplitude, and differ in frequency by 90 degrees. Thus, the first curved radiator 100 forms a circularly polarized antenna capable of receiving circularly polarized signals at a frequency of 2.1 GHz.

[0041] In some embodiments, as shown in FIG3 , a first grounding point 400 is further provided on the first arc-shaped radiator 100 . The first grounding point 400 is provided in the middle area of ​​the first arc-shaped radiator 100 , and the curvature of the arc between the feeding point 200 and the first grounding point 400 is smaller than a preset angle.

[0042] Specifically, a first grounding point 400 is provided on the first curved radiator 100, and the first grounding point 400 is also located in the middle area of ​​the first curved radiator 100. The arc between the feed point 200 and the first grounding point 400 is less than a preset angle. That is, the line connecting the first grounding point 400 and the center of the circle surrounding the first curved radiator 100 is a first line, and the line connecting the feed point 200 and the center of the circle surrounding the first curved radiator 100 is a second line. The angle between the first line and the second line is less than a preset angle. The preset angle is a relatively small angle, thereby ensuring that the feed point 200 and the first grounding point 400 are located close together, thereby improving the axial ratio of the first radiator when receiving the first circularly polarized signal, thereby enhancing the performance of the first curved radiator 100 as a circularly polarized antenna.

[0043] It should be noted that designers can set the preset angle based on real-time needs. For example, the preset angle can be set to an angle greater than zero degrees and less than 45 degrees. The preset angle can also be set to an angle greater than zero degrees and less than 10 degrees to ensure that the feed point 200 and the first ground point 400 are arranged as close as possible, thereby improving the performance of the first arc radiator 100 when receiving the first circularly polarized signal.

[0044] In some embodiments, as shown in FIG. 4 , the circularly polarized antenna further includes a frequency modulation component 500 , and the frequency modulation component 500 is electrically connected to the first arc-shaped radiator 100 .

[0045] Specifically, the frequency modulation component 500 can adjust the frequency of the signal received by the first arc-shaped radiator 100, so that the first arc-shaped radiator 100 can receive the first circularly polarized signal of the first target frequency.

[0046] If the frequency modulation component 500 is connected to a high current area on the first arc radiator 100, the frequency modulation component 500 has little effect on the frequency of the signal received by the first arc radiator 100, that is, the frequency modulation component 500 causes a small change in the frequency of the signal received by the first arc radiator 100. If the frequency modulation component 500 is connected to a low current area on the first arc radiator 100, the frequency modulation component 500 has a greater effect on the frequency of the signal received by the first arc radiator 100, that is, the frequency modulation component 500 causes a significant change in the frequency of the signal received by the first arc radiator 100.

[0047] Therefore, by connecting the frequency modulation component 500 at a suitable position of the first arc radiator 100, the frequency of the signal received by the first arc radiator 100 can be adjusted, and finally the first arc radiator 100 forms a circularly polarized antenna, which can receive the first circularly polarized signal of the first target frequency.

[0048] Exemplarily, the frequency modulation component 500 includes an inductor, a first end of the inductor is electrically connected to the first arc-shaped radiator 100, and a second end of the inductor is grounded; and / or, the frequency modulation component 500 includes a capacitor, a first end of the capacitor is electrically connected to the first arc-shaped radiator 100, and a second end of the capacitor is grounded.

[0049] Specifically, when the capacitor is connected to a high current area on the first arc radiator 100, the frequency of the signal received by the first arc radiator 100 is slightly reduced. When the capacitor is connected to a low current area on the first arc radiator 100, the frequency of the signal received by the first arc radiator 100 is significantly reduced.

[0050] When the inductor is connected to a high current area on the first arc radiator 100, the frequency of the signal received by the first arc radiator 100 will be slightly increased. When the inductor is connected to a low current area on the first arc radiator 100, the frequency of the signal received by the first arc radiator 100 will be significantly increased.

[0051] Therefore, designers can connect capacitors and / or inductors at appropriate positions on the first arc radiator 100 according to actual needs, so as to adjust the frequency of the signal received by the first arc radiator 100, and ultimately enable the first arc radiator 100 to receive the first circularly polarized signal of the first target frequency.

[0052] In some embodiments, as shown in Figure 5, the circularly polarized antenna further includes a second arc radiator 600, the second arc radiator 600 and the first arc radiator 100 are arranged at intervals, the second arc radiator 600 and the first arc radiator 100 are located on the same circumference, the arc length between the second end D of the second arc radiator 600 and the first end A of the first arc radiator 100 is smaller than the arc length between the first end C of the second arc radiator 600 and the second end B of the first arc radiator 100, a second grounding point 700 is provided on the second arc radiator 600, and the second grounding point 700 is provided at the second end of the second arc radiator 600, and the second end of the second arc radiator 600 includes the second end D of the second arc radiator 600 and the area near the second end D of the second arc radiator 600.

[0053] Specifically, when receiving the second circularly polarized signal, the first arc radiator 100 can excite the second arc radiator 600 to generate current, thereby forming a circularly polarized antenna with the second arc radiator 100 and the second arc radiator 600, which can receive the second circularly polarized signal.

[0054] The line connecting the second end D of the second arc radiator 600 and the center of the circle is a third line, and the line connecting the first end A of the first arc radiator 100 and the center of the circle is a fourth line. The angle between the third and fourth lines is set to be greater than or equal to 10 degrees and less than or equal to 30 degrees. The angle between the third and fourth lines can also be set to an angle between 10 degrees and 20 degrees. The second arc radiator 600 is placed as close as possible to the first arc radiator 100 to ensure that when the circularly polarized antenna receives a signal, the first arc radiator 100 can excite the second arc radiator 600 to generate a resonant current, so that the first radiating portion 101 on the first arc radiator 100 and the second arc radiator 600 together form a circularly polarized antenna to receive the second circularly polarized signal.

[0055] Figure 6(a) shows the current distribution on the first curved radiator 100 and the second curved radiator 600 when the circularly polarized antenna receives a third frequency signal in the first mode. Figure 6(b) shows the current distribution on the first curved radiator 100 and the second curved radiator 600 when the circularly polarized antenna receives a fourth frequency signal in the second mode. Figure 6(c) shows the current distribution on the first curved radiator 100 and the second curved radiator 600 when the circularly polarized antenna receives a fifth frequency signal in the third mode.

[0056] As can be seen in Figures 6 (a) and (b), the current flowing through the first arc radiator 100 when receiving a third frequency signal in the first mode and the current flowing through the first arc radiator 100 when receiving a fourth frequency signal in the second mode are nearly perpendicular to each other, have the same amplitude, and differ in frequency by 90 degrees. Therefore, a signal with a first target frequency exists, which is between the frequencies of the third and fourth frequency signals. This causes the current flowing through the first arc radiator 100 when receiving the first target frequency in the first mode and the current flowing through the first arc radiator 100 when receiving the first target frequency in the second mode to be perpendicular to each other, have the same amplitude, and differ in frequency by 90 degrees. Consequently, the first arc radiator 100 forms a circularly polarized antenna capable of receiving the first target frequency.

[0057] It can be seen from (b) and (c) in Figure 6 that when the circularly polarized antenna receives the fourth frequency signal in the second mode, the current synthesized by the first arc radiator and the second arc radiator 600 is the first current; when the circularly polarized antenna receives the fifth frequency signal in the third mode, the current synthesized by the first arc radiator 100 and the second arc radiator 600 is the second current, and the first current and the second current are nearly perpendicular to each other, have the same amplitude, and differ in frequency by 90 degrees. Therefore, there is a signal of a second target frequency, which is between the frequency of the fourth frequency signal and the frequency of the fifth frequency signal, so that when the circularly polarized antenna receives the second target frequency signal in the second mode, the current synthesized by the first arc radiator 100 and the second arc radiator 600 is the third current; when the circularly polarized antenna receives the second target frequency signal in the third mode, the current synthesized by the first arc radiator 100 and the second arc radiator 600 is the fourth current, and the third current and the fourth current are perpendicular to each other, have the same amplitude and a frequency difference of 90 degrees. Thus, the first arc radiator 100 and the second arc radiator 600 form a circularly polarized antenna, which can receive a circularly polarized antenna of the second target frequency.

[0058] Thus, the circularly polarized antenna formed by the first arc-shaped radiator 100 and the second arc-shaped radiator 600 can receive circularly polarized signals of two frequencies (a first circularly polarized signal and a second circularly polarized signal). Existing wearable electronic devices using a complete circular ring antenna can only receive circularly polarized signals of one frequency. However, the two arc-shaped radiators designed in this application (the first arc-shaped radiator 100 and the second arc-shaped radiator 600) can receive circularly polarized signals of two frequencies, increasing the number of received circularly polarized signals. This allows the wearable electronic device to be positioned based on circularly polarized signals of different frequencies. If a circularly polarized signal of one frequency becomes unusable, the wearable electronic device can use another circularly polarized signal for positioning, thereby improving the stability of the positioning function of the wearable electronic device.

[0059] In some embodiments, as shown in FIG6 , the second arc-shaped radiator 600 and the first radiating portion 101 on the first arc-shaped radiator 100 are used to receive a second circularly polarized signal; wherein the first radiating portion 101 includes a radiator between the feeding point 200 and the first end A on the first arc-shaped radiator 100 .

[0060] Specifically, it can be seen from (b) and (c) in Figure 6 that when the first radiating portion 101 receives the fourth frequency signal in the second mode, the current synthesized by the first radiating portion 101 and the second arc radiator 600 is the fifth current; when the first radiating portion 101 receives the fifth frequency signal in the third mode, the current synthesized by the first radiating portion 101 and the second arc radiator 600 is the sixth current, and the fifth current and the sixth current are almost perpendicular to each other, have the same amplitude, and have a frequency difference of 90 degrees. Therefore, there is a signal of a second target frequency, which is between the frequency of the fourth frequency signal and the frequency of the fifth frequency signal. When the circularly polarized antenna receives the second target frequency signal in the second mode, the current synthesized by the first radiating part 101 and the second arc radiator 600 is the seventh current; when the circularly polarized antenna receives the second target frequency signal in the third mode, the current synthesized by the first radiating part 101 and the second arc radiator 600 is the eighth current. The seventh current and the eighth current are perpendicular to each other, have the same amplitude and a frequency difference of 90 degrees. Thus, the first radiating part 101 and the second arc radiator 600 form a circularly polarized antenna, which can receive a circularly polarized antenna of the second target frequency.

[0061] The present application also discloses a wearable electronic device, including a housing, a position determining element and the circularly polarized antenna described above. The housing includes a bottom wall and a side wall connected to the bottom wall. The circularly polarized antenna is arranged on the side wall, and the position determining element is coupled to the circularly polarized antenna.

[0062] Specifically, the circularly polarized antenna is used to receive a first circularly polarized signal and transmit the first circularly polarized signal to a position determination element, which is used to determine the current geographic location based on the first circularly polarized signal. Since the circularly polarized antenna used in the wearable electronic device of the embodiment of the present application can form a circularly polarized antenna using a first arc-shaped radiator, there is no need to make a complete circular ring radiator, which reduces the length of the antenna and is conducive to the miniaturization design of the circularly polarized antenna. At the same time, it allows the first arc-shaped radiator to be flexibly designed in the wearable electronic device, reducing the design difficulty of the circularly polarized antenna. For the specific working principle, please refer to the above description of the circularly polarized antenna, which will not be repeated here.

[0063] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A circularly polarized antenna, characterized in that: It includes a first arc radiator, the arc of which is greater than or equal to 170 degrees and less than or equal to 190 degrees, a feeding point is arranged in the middle area of ​​the first arc radiator, the feeding point is used to be electrically connected to a position determining element, and the first arc radiator is used to receive a first circularly polarized signal.

2. The circularly polarized antenna according to claim 1, wherein A first grounding point is also provided on the first arc-shaped radiator. The first grounding point is provided in a middle area of ​​the first arc-shaped radiator. The curvature of the arc between the feeding point and the first grounding point is smaller than a preset angle.

3. The circularly polarized antenna according to claim 2, characterized in that: The preset angle is greater than zero degree and less than 45 degrees.

4. The circularly polarized antenna according to claim 3, characterized in that: The circularly polarized antenna also includes a frequency modulation component, which is electrically connected to the first arc radiator and is used to adjust the frequency of the signal received by the first arc radiator so that the first arc radiator can receive a first circularly polarized signal of a first target frequency.

5. The circularly polarized antenna according to claim 4, characterized in that: The frequency modulation component comprises an inductor, a first end of the inductor is electrically connected to the first arc-shaped radiator, and a second end of the inductor is grounded; and / or, The frequency modulation component includes a capacitor, a first end of the capacitor is electrically connected to the first arc-shaped radiator, and a second end of the capacitor is grounded.

6. The circularly polarized antenna according to any one of claims 1 to 5, characterized in that: The circularly polarized antenna also includes a second arc radiator, which is spaced apart from the first arc radiator, and is located on the same circumference as the first arc radiator. The arc length between the second end of the second arc radiator and the first end of the first arc radiator is smaller than the arc length between the first end of the second arc radiator and the second end of the first arc radiator. A second grounding point is provided on the second arc radiator, and the second arc radiator and the first arc radiator are used to receive a second circularly polarized signal.

7. The circularly polarized antenna according to claim 6, characterized in that: The second arc-shaped radiator and the first radiating portion on the first arc-shaped radiator are used to receive the second circularly polarized signal; wherein the first radiating portion includes a radiator between the feeding point and the first end on the first arc-shaped radiator.

8. The circularly polarized antenna according to claim 6, characterized in that: An arc angle of an arc between a first end of the first arc-shaped radiator and a second end of the second arc-shaped radiator on the circumference is greater than or equal to 10 degrees and less than or equal to 30 degrees.

9. The circularly polarized antenna according to claim 6, characterized in that: The second grounding point is arranged at the second end of the second arc-shaped radiator.

10. A wearable electronic device, characterized in that: A device comprising a housing, a position determining element and the circularly polarized antenna according to any one of claims 1 to 9, wherein the housing comprises a bottom wall and a side wall connected to the bottom wall, the circularly polarized antenna is arranged on the side wall, and the position determining element is coupled to the circularly polarized antenna; The circularly polarized antenna is used to receive a first circularly polarized signal and transmit the first circularly polarized signal to the position determining element, and the position determining element is used to determine a current geographical location according to the first circularly polarized signal.

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