Circularly polarized antenna and wearable electronic device using same

Abstract

The circularly polarized antenna is applied to wearable electronic equipment and comprises a floor, an annular radiator and an open-ring-shaped perturbation structure, the annular radiator is located on one side of the floor and connected with a feed signal through a feed terminal, and the open-ring-shaped perturbation structure is located on the other side of the floor. The side, facing the floor, of the annular radiator is provided with at least one open-ring-shaped perturbation structure, or the side, facing the annular radiator, of the floor is provided with at least one open-ring-shaped perturbation structure. According to the embodiment of the invention, a lumped capacitor or an inductor and other resonator devices do not need to be loaded between the radiator and the floor, and circular polarization of the loop antenna is realized by introducing the perturbation structure.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a circularly polarized antenna and wearable electronic devices using the same. Background Art

[0002] Wearable electronic devices for sports scenarios (for example, smart watches, bracelets, glasses, etc.) generally have positioning functions, and the reception performance of satellite signals largely determines the positioning performance of the device. Among them, the positioning antenna of the wearable electronic device, as the first link of the receiving link, plays a key role in the overall receiving performance.

[0003] Antennas are generally divided into linearly polarized antennas and circularly polarized antennas. Traditional positioning antennas for wearable electronic devices are mostly linearly polarized antennas, but the satellite system transmits to the ground in the form of right-handed circularly polarized electromagnetic waves, which means that the positioning signal sent by the satellite system is a right-handed circularly polarized signal after passing through the ionosphere. Therefore, the linearly polarized positioning antenna of the wearable electronic device cannot fully receive the right-handed circularly polarized positioning signal sent by the navigation satellite. In addition, the right-handed circularly polarized signal sent by the satellite system will become a left-handed circularly polarized signal after being reflected an odd number of times by objects such as the ground, tall buildings, and trees, thereby generating multipath interference, which will seriously affect the positioning effect of the entire wearable electronic device.

[0004] Therefore, if the positioning antenna on the wearable electronic device can be designed as a right-hand circularly polarized antenna, it can not only greatly reduce the polarization mismatch loss, but also effectively solve the multipath interference problem. Utility Model Content

[0005] According to a first aspect of the present application, a circularly polarized antenna is provided for use in wearable electronic devices, comprising: a floor, a ring-shaped radiator and an open-loop perturbation structure, wherein the ring-shaped radiator is located on one side of the floor, the ring-shaped radiator is connected to a feeding signal via a feeding terminal, and at least one open-loop perturbation structure is provided on a side of the ring-shaped radiator facing the floor, or at least one open-loop perturbation structure is provided on a side of the floor facing the ring-shaped radiator.

[0006] In some embodiments, the ring-shaped radiator includes one of the following shapes: a circular ring, an elliptical ring, a quadrilateral, or a polygonal ring.

[0007] In some embodiments, the open-loop perturbation structure and its projection on the floor form one of the following shapes: an open-loop circular ring, an open-loop elliptical ring, an open-loop quadrilateral, or an open-loop polygonal shape.

[0008] In some embodiments, the annular radiator is a centrally symmetrical structure, the open-loop perturbation structure is an axisymmetric structure, a line connecting a projection center of the feed terminal on the annular radiator and a symmetry center of the annular radiator is a first line, an intersection of a projection of the open-loop perturbation structure on the annular radiator and an axis of symmetry is a projection center of the open-loop perturbation structure, and a line connecting a projection center of the open-loop perturbation structure and a symmetry center of the annular radiator is a second line; when the angle range between the first line and the second line is [0°, 90°] or [180°, 270°], the circularly polarized antenna is a right-handed circularly polarized antenna; when the angle range between the first line and the second line is [90°, 180°] or [270°, 360°], the circularly polarized antenna is a left-handed circularly polarized antenna.

[0009] In some embodiments, a width of at least one of the ring-shaped radiator and the open-ring perturbation structure is 3 mm.

[0010] In some embodiments, the outer contour of the annular radiator is the same as the outer contour of the floor.

[0011] In some embodiments, the center of the ring-shaped radiator overlaps with the center of the floor.

[0012] In some embodiments, the gap between the annular radiator and the floor is in the range of [2mm, 4mm].

[0013] According to a second aspect of the present application, a wearable electronic device is provided, comprising the aforementioned circularly polarized antenna.

[0014] In some embodiments, a main board is also included, the floor is a grounding layer in the main board of the wearable electronic device, at least a feeding module is arranged on the main board, and the annular radiator is electrically connected to the feeding module through a feeding terminal.

[0015] In some embodiments, the outer contour of the mainboard of the wearable electronic device is circular or rectangular. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0017] Figure 1 An exemplary circuit structure diagram of a wearable electronic device provided by the present application is shown;

[0018] Figure 2 A three-dimensional schematic diagram of a circularly polarized antenna structure provided according to an embodiment of the present application is shown;

[0019] Figure 3-a A schematic diagram showing the resonant frequency of electromagnetic waves radiated by a radiator when it is in Mode 1 and Mode 2 without introducing a perturbation structure according to an embodiment of the present application is shown;

[0020] Figure 3-b A schematic diagram showing the resonant frequencies of electromagnetic waves radiated by a radiator when it is in the Model 1 mode and the Mode 2 mode in the case of introducing a perturbation structure according to an embodiment of the present application is shown;

[0021] Figure 4 A schematic top view of a circularly polarized antenna provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] The circular polarization antenna scheme applied to wearable electronic devices in the present application scheme will be described in detail below in combination with the satellite positioning principle and the basic structure of wearable electronic devices.

[0025] When positioning is achieved through satellite signals, a receiver is generally required, and according to the principle of implementing positioning, the receiver generally includes an antenna unit, a receiving unit and a processing unit. The antenna unit receives the satellite signals it tracks, for example, supports receiving one or more satellite signals in the Global Positioning System (GPS) of the United States, the Global Navigation Satellite System (GLONASS) of Russia, the Beidou Star Positioning System of China, the Galileo System (Galileo) of Europe, the Quasi-Zenith Satellite System (QZSS) of Japan, and the Regional Navigation Positioning System of India. The receiving unit can demodulate the satellite orbit parameters and other data according to the pseudo-distance from the receiving antenna to the satellite and the rate of change of the distance. Based on these data, the processing unit calculates the distance between the geographical location to be located (such as the geographical location of the wearable electronic device) and the satellite by calculating the propagation time of the satellite signal. When the antenna unit receives satellite signals from multiple satellites at the same time, the processor uses a triangulation positioning algorithm to calculate the longitude and latitude, altitude, speed, time and other information of the geographical location to be located (such as the geographical location of the wearable electronic device).

[0026] Wearable electronic devices are integrated with positioning functions or positioning services. Wearable electronic devices can monitor the movement distance and movement trajectory of human users through location positioning. Without the need for human users to carry mobile terminals (such as smart phones), wearable electronic devices can record the trajectory of the current movement scene. By pairing with the mobile terminal, users can also view exercise data such as exercise distance, movement trajectory, exercise steps, calorie consumption, heart rate, etc. through the APP on the mobile terminal.

[0027] Wearable electronic devices may be, for example, smart watches, smart bracelets, smart glasses, etc., or may be other electronic devices that can provide positioning functions or positioning services and can be carried by human users by wearing or other wearing methods.

[0028] See also Figure 1The schematic diagram of the circuit structure of the wearable electronic device shown in the figure shows an exemplary circuit structure of the wearable electronic device 100, wherein the wearable electronic device 100 includes a storage and processing circuit 10, and the storage and processing circuit 10 may include a memory, such as a hard disk drive memory, a non-volatile memory (e.g., a flash memory or other electrically programmable read-only memory configured to form a solid-state drive), a volatile memory (e.g., a static random access memory or a dynamic random access memory), etc. The processing circuit in the storage and processing circuit 10 can be used to control the operation of the wearable electronic device 100. The processing circuit can be based on one or more microprocessors, microcontrollers, digital signal processors, application-specific integrated circuits, etc. The storage and processing circuit 10 can be used to run software on the wearable electronic device 100, such as an Internet browsing application, a Voice over Internet Protocol (VOIP) phone call application, an email application, a media playback application, an operating system function, etc. In order to support interaction with an external device, the storage and processing circuit 10 can be used to implement a communication protocol. Communication protocols that may be implemented using storage and processing circuitry 10 include Internet protocols, wireless local area network protocols (e.g., IEEE 802.11 protocols—sometimes referred to as such), protocols for other short-range wireless communication links such as protocols, cellular telephone protocols, multiple-input multiple-output (MIMO) protocols, antenna diversity protocols, and the like.

[0029] The wearable electronic device 100 may also include input-output circuitry 20, which may include input-output devices 21. The input-output devices 21 may be used to allow data to be provided to the wearable electronic device 100 and to allow data to be provided from the wearable electronic device 100 to an external device. The input-output devices 21 may include user interface devices, data port devices, and other input-output components. For example, the input-output devices 21 may include, for example, a touch screen, a display without touch sensor capabilities, a button, a joystick, a scroll wheel, a trackpad, a keypad, a keyboard, a microphone, a camera, a button, a speaker, a status indicator, a light source, an audio jack and other audio port components, a digital data port device, a light sensor, a motion sensor (accelerometer), a capacitive sensor, a proximity sensor, a fingerprint sensor (e.g., a fingerprint sensor integrated with a button), etc.

[0030] The wearable electronic device 100 may also include a wireless communication circuit 30 for wirelessly communicating with an external device. The wireless communication circuit 30 may include a radio frequency transceiver circuit formed by one or more integrated circuits, a power amplifier circuit, a low noise input amplifier, a passive radio frequency (RF) component, one or more antennas, a transmission line, and other circuits for processing radio frequency wireless signals, such as Figure 1As shown, the radio frequency transceiver circuit may specifically include at least one of a satellite positioning receiver circuit 31, a local wireless transceiver circuit 32 (e.g., WiFi, Bluetooth), and a long-range wireless transceiver circuit 33 (e.g., a cellular phone transceiver circuit). The local wireless transceiver circuit 32 may process 2.4 GHz and 5 GHz bands for (IEEE 802.11) communications and may process 2.4 GHz communication bands; the long-range wireless transceiver circuit 33 may be used to process wireless communications in a frequency range, such as a low communication band from 700 MHz to 960 MHz, a low-medium communication band from 1400 MHz to 1520 MHz, a medium communication band from 1710 MHz to 2170 MHz, and a high communication band from 2300 MHz to 2700 MHz, or other communication bands between 700 MHz and 4000 MHz. If necessary, the wireless communication circuit 30 may include circuits for other short-range and long-range wireless links. For example, the wireless communication circuit 30 may include a near field communication (NFC) circuit; the satellite positioning receiver circuit 31 is used to receive and process GPS satellite signals at 1575 MHz or satellite signals of other satellite systems (eg, GLONASS satellite signals at 1609 MHz).

[0031] The wireless communication circuit 30 may include one or more antennas 34, and any suitable antenna type may be used to form the antenna 34. For example, the antenna 34 may include an antenna having a resonant element, and the antenna is formed by a combination of one or more of a loop antenna structure, a patch antenna structure, a dipole antenna structure, a monopole antenna structure, an inverted F-shaped antenna structure, a slot antenna structure, a planar inverted F-shaped antenna structure, a helical antenna structure, etc. Different types of antennas may be used for different frequency bands and frequency band combinations. For example, one type of antenna may be used when forming an antenna for a local wireless link, another type of antenna may be used when forming an antenna for a remote wireless link, and antennas other than the above two types may be used when forming a positioning antenna.

[0032] The circular polarization of the positioning antenna is usually achieved by loading a tuning device such as a lumped inductor or capacitor on the basis of a ring radiator, wherein the electrical connection between the radiator, the tuning device and the mainboard of the wearable electronic device is usually achieved through a ground terminal. This implementation method itself is unreliable, and the BOM cost of the wearable electronic device is increased due to the introduction of the tuning device, while the mainboard layout and wiring area is increased. In addition, since the tuning device such as the capacitor or inductor itself has parasitic resistance, it will consume part of the energy of the circular polarization antenna, causing the working efficiency of the circular polarization antenna to decrease. Therefore, if it is not necessary to load a tuning device such as a lumped inductor or capacitor to achieve the circular polarization of the positioning antenna, the above problems can be effectively avoided.

[0033] See also Figure 2 As shown, Figure 2 A three-dimensional schematic diagram of a circularly polarized antenna structure of the present application is shown. The circularly polarized antenna 200 (for example, Figure 1 An antenna in the antenna 34 can be applied to a wearable electronic device, which includes a ring-shaped radiator 210, an open-ring perturbation structure 220 of the radiator 210, and a floor 300. For the convenience of display, Figure 2 In the figure, the radiator 210 is a circular ring as an example of a ring shape, and the radiator 210 is located on one side of the floor 300 for the convenience of display. Figure 2 In the figure, the outer contour of the floor 300 is taken as a circle as an example, so that a gap is formed between the floor 300 and the outer contour of the floor 300.

[0034] The radiator 210 receives the feeding signal through the feeding terminal 230, and one or more perturbation structures 220 are arranged on the side of the radiator 210 facing the floor 300. The open ring is a ring with an opening, not a closed ring, for the convenience of display. Figure 2 In the example, the open-loop perturbation structure 220 is an arc-shaped ring as an example of an open-loop. Figure 2 In the figure, only one perturbation structure 220 is provided on the radiator 210. Figure 2 In the case shown, in other implementations of the present application, two or more perturbation structures 220 may be provided, and a certain distance may be provided between the multiple perturbation structures 220. The perturbation structure 220 may be made of a conductive material, for example, in one implementation, the perturbation structure 220 may be made of a metal material.

[0035] In addition, as another alternative, one or more open-loop perturbation structures 220 may be disposed on the side of the floor 300 facing the radiator 210 .

[0036] In the original state, when the radiator 210 does not introduce the perturbation structure 220, the amplitude and phase of the resonant frequency f1 of the electromagnetic wave radiated by the radiator 210 in Mode 1 are equal to the resonant frequency f2 of the electromagnetic wave radiated in Mode 2. The two modes will not produce a phase difference at any operating frequency, and circular polarization cannot be achieved. Figure 3-aAs shown; when the radiator 210 introduces the perturbation structure 220, due to the capacitance effect formed by the perturbation structure 220, the resonant frequency f1 of the electromagnetic wave radiated by the radiator 210 in Mode 1 is different from the resonant frequency f2 of the electromagnetic wave radiated in Mode 2. Specifically, f1 will be smaller than f2. If the operating frequency is selected between f1 and f2, the two modes will produce a certain phase difference within the operating frequency range. When the phase difference is around 90°, the electromagnetic wave radiated by the radiator 210 will form circular polarization, as shown in FIG. Figure 3-b That is to say, the introduction of the perturbation structure 220 makes the resonant frequencies of the electromagnetic waves radiated by the radiator 210 in two resonant modes with the same resonant frequency and resonant currents perpendicular to each other become different. By selecting a suitable operating frequency, the phase difference of the resonant frequency can be controlled to be around 90° within the operating frequency range, and a circularly polarized radiation mode is generated.

[0037] See also Figure 4 As shown, Figure 4 A schematic top view of a circularly polarized antenna provided according to an embodiment of the present application is shown, wherein the radiator 210 is a centrally symmetrical structure, the perturbation structure 220 is an axisymmetric structure, a line connecting a projection of a feed terminal 230 on the radiator 210 and a symmetry center of the radiator 210 is a first line, an intersection of a projection of the perturbation structure 220 on the radiator 210 and the symmetry line is a projection center of the perturbation structure 220, a line connecting the projection center of the perturbation structure 220 and the symmetry center of the radiator 210 is a second line, and an angle between the first line and the second line is set to α.

[0038] When α is between [0°, 90°], or between [180°, 270°], the equivalent feeding signal current component in Mode 1 is greater than the equivalent feeding signal current component in Mode 2, and the circularly polarized antenna 200 is a right-hand circularly polarized antenna; when α is between [90°, 180°], or between [270°, 360°], the equivalent feeding signal current component in Mode 1 is less than the equivalent feeding signal current component in Mode 2, and the circularly polarized antenna 200 is a left-hand circularly polarized antenna.

[0039] By adjusting the positions of the perturbation structure 220 and the feeding terminal 230 , the value of α can be changed, and thus the rotation direction of the electromagnetic wave radiated by the circularly polarized antenna can be changed.

[0040] In addition, the gap between the radiator 210 and the floor 300 is related to the radiation efficiency of the antenna, that is, the radiation efficiency of the antenna can be changed by adjusting the gap between the radiator 210 and the floor 300. For example, in one implementation of the present application, the gap can be adjusted within [2mm, 4mm].

[0041] The annular radial width of the radiator 210 is related to the bandwidth of the antenna, that is, the bandwidth of the antenna can be changed by adjusting the annular radial width of the radiator 210. For example, in one implementation of the present application, the width can be set to 3 mm so that the bandwidth of the circularly polarized antenna 200 can cover and adapt to the GPS bandwidth.

[0042] Generally, the positioning signal sent by the satellite system is a right-hand circularly polarized signal after passing through the ionosphere. In one implementation of the present application, the circularly polarized antenna 200 can be designed as a right-hand circularly polarized antenna. The right-hand circularly polarized antenna can better receive satellite signals. At the same time, the right-hand circularly polarized radiation generated by the radiators 210 and 220 can also filter the left-hand circularly polarized satellite signals reflected by high-rise buildings or the ground to reduce multipath interference, thereby effectively improving the positioning accuracy of the positioning antenna of the wearable electronic device.

[0043] In the implementation of the present application, the floor 300 can be a grounding layer in the motherboard of the wearable electronic device, for example, a reference ground, and the reference ground refers to the GND (Ground) of the circularly polarized antenna 200. As the zero potential plane of the circularly polarized antenna 200, it is usually the copper layer of the motherboard. The "grounding" described in the application is an electrical connection with the reference ground of the motherboard. The grounding terminal is also electrically connected to the radiator 210 at one end, and the other end is connected to the reference ground on the motherboard. It can be understood that the connection between the grounding terminal and the radiator 210 can be an electrical connection formed by a connecting component, or it can be integrally formed, and the present disclosure does not limit this.

[0044] The main board may be a printed circuit board (PCB), and the corresponding functions are realized by setting various circuit modules on the main board. Alternatively, the main board may be of other types, such as a combination of a printed circuit board and a flexible printed circuit (FPC), etc., which is not limited in this application.

[0045] For the circularly polarized antenna 200, a feeding module may also be provided in the mainboard, for example, a radio frequency feeding circuit, which may be, for example, a radio frequency integrated circuit (IC) chip. The radio frequency feeding circuit serves as an excitation source of the circularly polarized antenna 200 and is used to feed the radiator 210. One end of the feeding terminal 230 is electrically connected to the radiator 210, and the other end is connected to the radio frequency feeding circuit on the mainboard. It is understandable that the connection between the feeding terminal 230 and the radiator 210 may be an electrical connection formed by a connecting component, or may be integrally formed, and this application does not limit this. In one example, the feeding terminal 230 is integrally formed with the radiator 210, and its free end may be directly electrically connected to the radio frequency feeding circuit of the mainboard 300. As an alternative, its free end may also be electrically connected to the radio frequency feeding circuit of the mainboard 300 through a connector (e.g., a spring structure) on the mainboard 300.

[0046] The perturbation structure 220 may be disposed on the radiator 210 in a protruding manner, such as Figure 2 As shown, the perturbation structure 220 can also be provided on the radiator 210 in a concave form. For example, the radiator 220 has a concave structure in the direction toward the floor, which is not limited in the present embodiment. The perturbation structure 220 can be provided on the radiator 210 through a connector, or it can be integrally formed with the radiator 210, which is not limited in the present embodiment.

[0047] Finally, it should be noted that Figure 2 It is only an example. The radiator 210 in the present application is annular, but the specific shape of the radiator 210 is not specifically limited in the embodiment of the present application, and can be any one of the following shapes: circular ring, elliptical ring, quadrilateral, polygonal. The perturbation structure 230 in the present application is annular with an opening. For example, the width of the ring is the same as the width of the radiator 210. Of course, it can also be different from the width of the radiator 210, such as less than the width of the radiator 210. In addition, the embodiment of the present application does not limit the specific shape of the perturbation structure 230. The shape of the perturbation structure 230 and the projection of the perturbation structure 230 on the floor 300 can be any one of the following shapes: an open circular ring, an open elliptical ring, an open quadrilateral, and an open polygonal. In addition, the embodiment of the present application does not specifically limit the circumferential length of the opening of the perturbation structure 230.

[0048] In addition, the embodiment of the present application does not specifically limit the outer contour shape of the floor 300, and it can be any one of the following shapes: circular, elliptical, quadrilateral, polygonal.

[0049] In an implementation of the present application, the outer contour of the radiator 210 may be the same as the outer contour of the floor 300 . For example, the radiator 210 is in the shape of a quadrilateral, and the outer contour of the corresponding floor 300 is in the shape of a quadrilateral.

[0050] Since wearable electronic devices such as smart watches and smart bracelets are usually designed to be circular or rectangular in industrial design (the four sides of the rectangle may also have arc-shaped chamfers), in consideration of saving the design space of wearable electronic devices and making them more compact in space, therefore, in one implementation of the present application, the radiator 210 is in a circular shape, and the outer contours of the corresponding mainboard and the floor 300 located thereon are circular, or the radiator 210 is in a rectangular frame shape, and the outer contours of the corresponding mainboard and the floor 300 located thereon are rectangular.

[0051] In addition, considering the rationality of space design, the center of the radiator 210 overlaps with the center of the main board and the center of the floor 300 located thereon.

[0052] In an embodiment of the present application, a perturbation structure is introduced in the circularly polarized antenna, so that the resonant frequencies of the electromagnetic waves radiated by the radiator 210 in two resonant modes with the same resonant frequency and resonant currents perpendicular to each other become different. By selecting a suitable operating frequency, the phase difference of the resonant frequency can be controlled to be around 90° within the operating frequency range, forming a circularly polarized radiation mode, without the need to load resonant devices such as lumped capacitors or inductors between the radiator and the mainboard, thereby avoiding the problem of decreased radiation efficiency due to parasitic resistance. At the same time, since there is no need to load lumped inductors and capacitors, there is no need to occupy additional mainboard area, and an additional ground terminal introduced to load lumped inductors and capacitors is avoided, thereby improving the reliability of system operation.

[0053] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A circularly polarized antenna, characterized in that: The invention is applied to wearable electronic devices, comprising: a floor, a ring-shaped radiator and an open-loop perturbation structure, wherein the ring-shaped radiator is located on one side of the floor, the ring-shaped radiator is connected to a feeding signal through a feeding terminal, and at least one open-loop perturbation structure is provided on a side of the ring-shaped radiator facing the floor, or at least one open-loop perturbation structure is provided on a side of the floor facing the ring-shaped radiator.

2. The circularly polarized antenna according to claim 1, characterized in that: The annular radiator includes one of the following shapes: a circular ring, an elliptical ring, and a polygonal shape.

3. The circularly polarized antenna according to claim 1, characterized in that: The open-loop perturbation structure and its projection on the floor form one of the following shapes: an open-loop circular ring, an open-loop elliptical ring, and an open-loop polygonal frame.

4. The circularly polarized antenna according to claim 1, characterized in that: The annular radiator is a centrally symmetrical structure, the open-loop perturbation structure is an axisymmetric structure, a line connecting the projection of the feeding terminal on the annular radiator and the center of symmetry of the annular radiator is a first line, an intersection of the projection of the open-loop perturbation structure on the annular radiator and the axis of symmetry is the projection center of the open-loop perturbation structure, and a line connecting the projection center of the open-loop perturbation structure and the center of symmetry of the annular radiator is a second line; when the angle range between the first line and the second line is [0°, 90°] or [180°, 270°], the circularly polarized antenna is a right-handed circularly polarized antenna; when the angle range between the first line and the second line is [90°, 180°] or [270°, 360°], the circularly polarized antenna is a left-handed circularly polarized antenna.

5. The circularly polarized antenna according to any one of claims 1 to 4, characterized in that: The outer contour of the annular radiator is the same as the outer contour of the floor.

6. The circularly polarized antenna according to any one of claims 1 to 4, characterized in that: The center of the annular radiator overlaps with the center of the floor.

7. The circularly polarized antenna according to any one of claims 1 to 4, characterized in that: The gap between the annular radiator and the floor is in the range of [2mm, 4mm].

8. A wearable electronic device, characterized in that: It comprises the circularly polarized antenna as claimed in any one of claims 1 to 7.

9. The wearable electronic device according to claim 8, characterized in that: It also includes a main board, the floor is a grounding layer in the main board of the wearable electronic device, at least a feeding module is arranged on the main board, and the open-loop radiator is electrically connected to the feeding module through a feeding terminal.

10. The wearable electronic device according to claim 8, characterized in that: The outer contour of the mainboard of the wearable electronic device is circular or rectangular.

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