Antenna assembly and wearable device

Abstract

The embodiment of the invention relates to an antenna assembly and wearable equipment, and the antenna assembly comprises a feeder line which is used for transmitting a feed signal from a feed source; the radiation unit is connected to the feeder line, and the radiation unit is provided with a gap penetrating along the thickness direction; wherein the radiation unit is used for receiving and transmitting an electromagnetic wave signal under the excitation of the feed signal, the electromagnetic wave signal radiated by the radiation unit can cover communication frequency bands corresponding to various wireless communication networks, and the effective communication distances of the various wireless communication networks are not completely the same.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of antenna technology, and in particular, to an antenna assembly and a wearable device. Background Art

[0002] In wearable devices that require large amounts of data transmission, such as virtual reality (VR) and augmented reality (AR), wireless or wired methods are usually used to transmit data. Among them, the effective communication distance of wireless communication methods such as WIFI is only about 10 meters. Therefore, consumer-grade wearable devices will use wired methods to transmit signals, but wired methods are also limited by the length of the signal line. Therefore, the communication flexibility of wearable devices in the existing technology can no longer meet the user's usage needs. Summary of the invention

[0003] Based on this, it is necessary to provide an antenna assembly and wearable device that can communicate flexibly to address the above technical problems.

[0004] In a first aspect, the present application provides an antenna assembly, comprising:

[0005] A feeder line, used for transmitting a feed signal from a feed source;

[0006] A radiation unit connected to the feeder, wherein the radiation unit is provided with a gap penetrating along a thickness direction;

[0007] Among them, the radiation unit is used to send and receive electromagnetic wave signals under the stimulation of the feeding signal. The electromagnetic wave signals radiated by the radiation unit can cover the communication frequency bands corresponding to multiple wireless communication networks, and the effective communication distances of the multiple wireless communication networks are not exactly the same.

[0008] In a second aspect, the present application further provides a wearable device, comprising:

[0009] A housing, wherein the housing is formed by the housing;

[0010] A feed source is arranged in the receiving space of the shell;

[0011] The antenna assembly as mentioned above is mechanically connected to the housing and electrically connected to the feed source.

[0012] The above antenna assembly and wearable device can expand the communication frequency band that the radiation unit can cover through the gap in the radiation unit, so that the radiation unit can support the transmission and reception of electromagnetic wave signals of multiple wireless communication networks. In the case that the effective communication distances of multiple wireless communication networks are not exactly the same, the wireless communication network to be connected can be flexibly switched according to the distance between the wearable device where the antenna assembly is located and the communication object, so that the wearable device where the antenna assembly is located has good communication quality in both long-distance communication and short-distance communication scenarios, and the delay is reduced to less than 10ms. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. 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 paying creative work.

[0014] Figure 1 is a structural schematic diagram of an antenna assembly according to an embodiment;

[0015] Figure 2 is a schematic plan view of a reflective layer according to an embodiment;

[0016] Figure 3 The S11 simulation curve and the measured curve of the antenna assembly of one embodiment;

[0017] Figure 4 is a gain pattern of an antenna assembly according to an embodiment;

[0018] Figure 5 A schematic diagram of a communication method of a wearable device according to an embodiment;

[0019] Figure 6 A joint simulation radiation far-field distribution diagram of a wearable device equipped with an antenna assembly according to an embodiment.

[0020] Component number description:

[0021] Feeder: 100; radiating unit: 200; gap: 210; reflection layer: 300; reflection area: 310; clearance area: 320. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first direction may be referred to as a second direction, and similarly, a second direction may be referred to as a first direction without departing from the scope of this application.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined. "Several" means at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0025] The embodiment of the present application provides an antenna assembly that can be applied to a wearable device, thereby improving the communication flexibility of the wearable device. Among them, a wearable device is a portable device that is directly worn on the user's body. Through the wearable device, the user can realize various functions, such as checking time, making calls, playing games, listening to music, and various applications. Wearable devices are usually wristband devices or head-mounted devices. Wristband devices can be smart watches, smart watches, smart wristwatches, etc. Head-mounted devices can be head-mounted display devices, headphones, etc. Next, this application will be illustrated by taking a head-mounted display device as an example.

[0026] Virtual Reality (VR) technology, Augmented Reality (AR) technology, and Mixed Reality (MR) technology are computer simulation systems that can create and experience a virtual world. They use computers to generate a simulated environment. They are a system simulation of multi-source information fusion, interactive three-dimensional dynamic vision and entity behavior, allowing users to immerse themselves in the environment. With the continuous development of these technologies, head-mounted display devices equipped with these technologies have gradually become one of the commonly used devices that people can choose. Head-mounted display devices can be display devices for virtual reality, augmented reality, or mixed reality, such as virtual reality glasses, augmented reality glasses, or mixed reality glasses. Head-mounted display devices can be worn on the user's head and cover the user's glasses, thereby realizing the functions of virtual reality, augmented reality, or mixed reality.

[0027] The head-mounted display device is capable of transmitting data to an external processing device through a signal connection and receiving data from an external processing device. The signal connection may be a wired connection, a wireless connection, or a combination thereof. The signal connection may carry any kind of data, such as image data (e.g., still images and / or full motion video, including 2D and 3D images), audio, multimedia, voice, and / or any other type of data. The external processing device may be a game console, a personal computer, a tablet computer, a smart phone, or other type of processing device. The signal connection may be, for example, a universal serial bus (USB) connection, a Wi-Fi connection, a Bluetooth or Bluetooth low energy (BLE) connection, an Ethernet connection, a cable connection, a DSL connection, a cellular connection (e.g., 3G, LTE / 4G, or 5G), or the like, or a combination thereof. In addition, the external processing device may communicate with one or more other external processing devices via a network, which may be or include, for example, a local area network (LAN), a wide area network (WAN), an intranet, a metropolitan area network (MAN), the global Internet, or a combination thereof. Display devices, optical devices, sensors, processors, and the like may be installed in the head-mounted display device. For example, in virtual reality glasses, the display device is designed to realize the function of virtual reality glasses by projecting light into the user's eyes.

[0028] Figure 1 is a schematic diagram of the structure of an antenna assembly according to an embodiment, referring to Figure 1 , the antenna assembly includes a feed line 100 and a radiation unit 200.

[0029] Among them, one end of the feed line 100 is connected to the feed source, and the other end of the feed line 100 is respectively connected to multiple radiation units 200. The feed line 100 is used to transmit the feed signal from the feed source, and provide it to the connected radiation unit 200 to stimulate the radiation unit 200 to send and receive electromagnetic wave signals. Specifically, in the process of signal transmission, the RF chip converts the baseband signal into a high-frequency signal suitable for wireless transmission, the feed source converts the high-frequency current signal processed by the RF chip into a feed signal, and transmits it to the radiation unit 200 through the feed line 100, and the radiation unit 200 transmits the electromagnetic wave signal into space according to the feed signal. The signal reception process is the opposite. The radiation unit 200 receives the electromagnetic wave signal in the space and transmits it to the feed source through the feed line 100. The feed source converts it into a high-frequency current signal, and then transmits it to the RF chip for processing.

[0030] The radiation unit 200 may be an omnidirectional antenna. An omnidirectional antenna is an antenna that radiates uniformly at 360° in a horizontal pattern. That is, an omnidirectional antenna can send and receive signals uniformly in all directions without a specific direction, thereby providing a wider signal coverage range, and can be installed at any position according to actual needs without worrying about the direction of signal coverage. It is understandable that, based on the characteristics of the omnidirectional antenna, when the radiation unit 200 is applied to a head-mounted display device, by providing all-round signal coverage, the discomfort caused by signal interruption or quality degradation due to the user's limb movement is reduced, thereby enhancing the user's immersive experience. The radiation unit 200 is provided with a slit 210 that runs through the thickness direction, and the slit 210 can change the path of the excitation current on the radiation unit 200, thereby adjusting the resonant frequency of the radiation unit 200 so that it can cover a wider frequency band. Among them, the resonant frequency of the radiation unit 200 can be flexibly adjusted by the parameters of the slit 210, so that it can work in different frequency bands. Exemplarily, the adjustable resonant frequency includes but is not limited to the length, width and shape of the slit 210.

[0031] The electromagnetic wave signal radiated by the radiation unit 200 can cover the communication frequency bands corresponding to a variety of wireless communication networks, and the effective communication distances of the various wireless communication networks are not exactly the same. Among them, the wireless communication networks that the radiation unit 200 can support include but are not limited to cellular communication networks, Bluetooth communication networks and WIFI communication networks. The effective communication distance of the cellular communication network is the highest, which can reach thousands of kilometers. The effective communication distance of the WIFI communication network is in the middle, which can reach tens to 100 meters under ideal conditions, but it will drop to about 10 meters when there are obstacles such as walls indoors. The effective communication distance of the Bluetooth communication network is the shortest, less than 10 meters. The setting of the gap 210 allows the radiation unit 200 to cover the communication frequency bands corresponding to a variety of wireless communication networks, and the wireless communication network to be accessed can be freely switched according to the user's usage scenario. For example, when a wearable device is used indoors, a WiFi communication network can be used preferentially. In outdoor situations where long-distance transmission is required, cellular communication networks such as 5G can be used to achieve low-latency, high-speed data transmission.

[0032] Furthermore, in order to achieve effective signal distribution, the same feeder 100 can be connected to different feed sources to transmit the feed signals for supporting different wireless communication networks to the radiation unit 200. In order to ensure the stable operation and signal quality of the RF system, the connection between the feeder 100 and the feed source can be achieved through a duplexer or a combiner. Taking the combiner as an example, the first end of the combiner is connected to the feeder 100, and the multiple second ends of the combiner are respectively connected to the multiple feed sources one by one, so that the feed signals corresponding to different wireless communication networks are respectively transmitted through different paths in the combiner. Exemplarily, a second end of the combiner is connected to a first feed source for supporting cellular communication, and the other second end of the combiner is connected to a second feed source for supporting WIFI communication.

[0033] Optionally, the type of the feeder 100 may be, but is not limited to, a microstrip feeder 100, a coaxial feeder 100, a stripline feeder 100, and the like. Among them, the microstrip feeder 100 is composed of a single conductor strip supported on a dielectric layer, and is suitable for making a planar structure transmission line of a microwave integrated circuit. The microstrip feeder 100 is small in size and light in weight, and is easy to integrate into electronic devices, especially those electronic devices with strict space requirements. Moreover, the microstrip feeder 100 can support a wider frequency band and is suitable for the transmission of high-speed signals. The coaxial feeder 100 is mainly composed of two inner and outer conductors and an insulator in the middle, and is suitable for wide-band transmission, but its transmission speed is limited by physical size and may not be suitable for all high-speed applications. Striplines are usually larger in size and weight, and have a slower transmission speed, and are more suitable for low-frequency or low-speed usage scenarios. Striplines are a copper strip line placed in the middle of a dielectric between two layers of conductive planes. Although the characteristic impedance can be effectively controlled, its structure is relatively complex. Therefore, the type of feeder 100 can be selected according to the size of the wearable device and the communication rate requirements. For example, a long microstrip feeder 100 can be used in a head-mounted display device to reduce the volume occupied by the feeder 100 in the head-mounted display device and improve the communication rate of the head-mounted display device.

[0034] In the embodiment of the application, the communication frequency band that the radiation unit 200 can cover can be expanded by providing the gap 210 in the radiation unit 200, so that the radiation unit 200 can support the transmission and reception of electromagnetic wave signals of multiple wireless communication networks. In the case where the effective communication distances of multiple wireless communication networks are not exactly the same, the wireless communication network to be connected can be flexibly switched according to the distance between the wearable device where the antenna assembly is located and the communication object, so that the wearable device where the antenna assembly is located has good communication quality in both long-distance communication and short-distance communication scenarios, and the delay is reduced to less than 10ms.

[0035] In one of the embodiments, the slot 210 includes a plurality of slot segments, and the extension directions of the plurality of slot segments on the surface of the radiation unit 200 are not completely the same. Specifically, by setting a plurality of slot segments with different extension directions, a plurality of working excitation points can be generated, thereby increasing the bandpass selectivity of the antenna assembly, thereby generating a broadband communication frequency band. It can be understood that the more slot segments the slot 210 includes, the more interference there will be in the electric field path distribution, thereby generating more working excitation points, and thus facilitating the formation of a broadband antenna. Therefore, the number of slot segments can be flexibly selected according to the number of frequency bands and bandwidths that the antenna assembly needs to cover to meet communication requirements.

[0036] In one embodiment, the outer contour of the slot 210 is a cross shape. Specifically, the cross-shaped slot 210 can be understood to include four slot segments arranged clockwise, and one end of the four slot segments is connected. The angle between adjacent slot segments is 90°, and the angle between relative slot segments is 180°. The cross-shaped slot 210 is easy to process and can cover the communication frequency bands corresponding to a variety of wireless communication networks. Exemplarily, the cross-shaped slot 210 can cover the MHB frequency band under the 4G / 5G cellular communication network, and the 2.4GHz frequency band under the WiFi communication network, so that the antenna assembly can support the cellular communication network in the long-distance communication scenario, and support the WiFi communication network in the short-distance communication scenario, so that the antenna assembly has better communication quality.

[0037] In one of the embodiments, the size of the slot 210 in the first direction is within the same preset range as the size of the slot 210 in the second direction. That is, the size of the slot 210 in the first direction is the same or similar to the size of the slot 210 in the second direction. Wherein, the first direction is perpendicular to the second direction, and the first direction and the second direction are both perpendicular to the thickness direction of the radiation unit 200. The outer contour of the radiation unit 200 can be an axisymmetric shape, and the symmetry axis of the outer contour of the radiation unit 200 is parallel to the first direction. In the embodiment of the application, by setting the aspect ratio of the overall size of the slot 210 to 1:1, the shape of the slot 210 is closer to a square, which helps to achieve a more uniform current distribution. Uniform current distribution can reduce the reflection and scattering of electromagnetic waves, thereby improving the efficiency and gain of the antenna. Moreover, when the aspect ratio of the slot 210 is 1:1, it is easier to adjust the impedance of the antenna assembly to match the characteristic impedance of the feeder 100, thereby helping to reduce the reflection loss of the signal and improve the radiation efficiency of the antenna.

[0038] In one of the embodiments, the number of the radiation units 200 is multiple, that is, the multiple radiation units 200 can synchronously send electromagnetic wave signals, and can also synchronously receive electromagnetic wave signals. Exemplarily, the number of the radiation units 200 is two, and the two radiation units 200 are used to synchronously send and receive electromagnetic wave signals under the excitation of the feed signal. Among them, the two radiation units 200 are arranged axially symmetrically, and the symmetry axis is parallel to the extension direction of the feed line 100. Specifically, the two symmetrically arranged radiation units 200 can constitute a symmetrical dipole antenna. Through simple adjustment, the input impedance of the symmetrical dipole antenna can be well matched with the feeding network, especially in the case of a half-wave dipole, its input impedance is close to the common 50 ohm characteristic impedance. When the two radiation units 200 in the symmetrical dipole antenna synchronously send and receive electromagnetic wave signals, the radiation pattern usually has good directivity and can concentrate the radiation energy in a specific direction, thereby helping to improve communication quality and reduce interference. Therefore, in short-distance communication scenarios such as Wi-Fi and Bluetooth, as well as long-distance communication scenarios such as cellular, symmetrical vibrator antennas can provide good signal coverage and transmission efficiency, thereby meeting users' communication needs for wearable devices.

[0039] In one embodiment, the width of the radiation unit 200 at one end close to the feeder 100 is smaller, and the width at one end away from the feeder 100 is larger. Exemplarily, the outer contour of the radiation unit 200 is an isosceles triangle, and the feeder 100 is connected to the vertex of the isosceles triangle. Compared with other shapes such as rhombus, circle, and irregular triangle, the main lobe directivity of the isosceles triangle antenna is better. It can be understood that the outer contour of the radiation unit 200 can also be other shapes, which is not limited here.

[0040] In one embodiment, the antenna assembly includes a radiation layer, a dielectric layer and a reflective layer arranged in layers. Figure 1 It can also be understood as a planar schematic diagram of the radiation layer. Figure 1, a plurality of the radiation units 200 are all arranged in the radiation layer, and the radiation units 200 are sheet structures extending in the radiation layer. Further, the feeder 100 can also be arranged in the radiation layer, and the area outside the radiation unit 200 and the feeder 100 in the radiation layer can be filled with dielectric material. The reflection layer is used to reflect the electromagnetic wave signal from the radiation unit 200 so that the reflected electromagnetic wave signal is emitted in a target direction, and the target direction is the direction from the reflection layer to the radiation layer. That is, the reflection layer can reflect the backward radiation of the radiation layer, thereby increasing the intensity of the forward radiation. The reflection layer redirects the radiation energy to make it more concentrated. Therefore, the reflection layer helps to improve the gain of the antenna and improve the radiation pattern of the antenna component, so that it has a sharper main lobe and lower side lobes, thereby improving the directivity of the signal. The dielectric layer is used to isolate the radiation layer and the reflection layer, and provide a physical process for the radiation layer, so as to keep the structure of the antenna component stable. The dielectric layer can also change the electromagnetic environment around the antenna component and affect its radiation characteristics. By selecting the appropriate dielectric constant and thickness, the resonant frequency of the antenna assembly can be adjusted, thereby extending its operating bandwidth.

[0041] In one embodiment, the dielectric material filled in the radiation layer and the dielectric layer can be made of Rogers RT / duriod 5880 flexible special sheet, the dielectric constant of which is ε=2.2 and θ=0.0009. Moreover, the use of the flexible special sheet allows the antenna assembly to be bent at will and can be attached to any position of the head-mounted display device, playing the role of decorative beautification. In addition, the weight of the flexible special sheet is relatively light, which can meet the convenience requirements of the head-mounted display device.

[0042] Figure 2 is a schematic plan view of a reflective layer according to an embodiment, referring to Figure 2 In one embodiment, the reflective layer 300 is provided with a reflective area 310 and a clearance area 320, the portion of the reflective layer 300 located in the reflective area 310 is made of a metal material, and the portion located in the clearance area 320 is made of the same dielectric material as the dielectric layer. The orthographic projection of the radiation unit 200 on the reflective layer 300 at least partially falls in the reflective area 310. Specifically, the provision of the clearance area 320 can ensure that electromagnetic waves can propagate freely without hindrance, thereby maintaining the performance and efficiency of the antenna assembly.

[0043] Figure 3The S11 simulation curve and measured curve of the antenna assembly of an embodiment. It should be noted that due to certain errors caused by the processing of the plate and the microstrip line material, there is a certain difference between the simulation curve and the measured curve, but this difference is acceptable. Among them, S11 is called the input reflection coefficient, which refers to the proportional relationship between the incident wave and the reflected wave. S11 reflects how much incident energy is reflected back by the load, and is usually used to measure the input matching of antennas, RF devices, etc. That is, the lower the S11 value, the less reflection and the better the input matching. Reference Figure 3 The measured frequency band ranges from 1.8 GHz to 2.5 GHz, and the four excitation points brought by the cross-shaped slot 210 are 1.83 GHz, 2.2 GHz, 2.4 GHz and 2.5 GHz. Obviously, the above frequency band range can basically cover the MHB band under 4G / 5G in cellular communication technology and the 2.4 GHz band of WiFi communication technology. Moreover, the gains at the above four excitation points are 5.47 dBi, 5.88 dBi, 1.97 dBi and 3.56 dBi respectively. Figure 4 is a gain pattern of an antenna assembly according to an embodiment, Figure 4 The antenna omnidirectional gain diagram of the antenna assembly working in the cellular 5G SA N41 frequency band is selected for reference. Figure 4 , the peak gain of the antenna assembly is 2.23 dBi. Therefore, the gain of the antenna assembly of this embodiment can meet the requirements of high-quality communication.

[0044] The embodiment of the present application also provides a wearable device, comprising a housing, a feed source and the above-mentioned antenna assembly. The housing is enclosed by the housing to form a receiving space, the feed source is arranged in the receiving space of the housing, and the antenna assembly is mechanically connected to the housing and electrically connected to the feed source. Figure 5 FIG. 1 is a schematic diagram of a communication method of a wearable device according to an embodiment of the present invention. Figure 5 , the wearable device can communicate with the central processing unit through short-distance communication networks such as WIFI, and communicate with the base station through long-distance communication networks such as 5G cellular. Therefore, based on the aforementioned antenna assembly, the wearable device of this embodiment can flexibly switch to different wireless communication networks according to the actual communication situation, so that the wearable device has good communication quality in both long-distance communication and short-distance communication scenarios.

[0045] In one embodiment, the shell is provided with a cavity, the cavity is arranged near the outer surface of the shell, and the antenna assembly is accommodated in the cavity. Specifically, the shell does not adopt a metal enclosed structure, and preferably has no metal at least on the radiation path of the antenna assembly, for example, polyethylene plastic or other materials can be used, so as to reduce the influence of metal on the radiation performance of the antenna assembly.

[0046] In one of the embodiments, the antenna assembly is attached to the outer surface of the shell, so that the shell of the wearable device is modified while ensuring the communication quality of the antenna assembly.

[0047] Figure 6 This is a joint simulation radiation far-field distribution diagram of a wearable device equipped with an antenna assembly according to an embodiment. Figure 6 Use FEKO software to perform joint simulation of the entire communication system, refer to Figure 6 , the wearable device of this embodiment has good radiation intensity in all directions. Table 1 is a performance indicator table of a wearable device with an antenna assembly. Referring to Table 1, the wearable device of this embodiment has a gain of 5.14dBi in the frequency band range of 2.4GHz to 2.5GHz of the WIFI communication network, a gain of 4.23dBi in the N1 frequency band range of 1.8GHz to 2.1GHz of the 5G SA communication network, and a gain of 4.67dBi in the N41 frequency band range of 2.3GHz to 2.5GHz of the 5G SA communication network.

[0048] Table 1 Performance indicators of wearable devices equipped with antenna components

[0049]

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments only express several implementation methods of the embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the embodiments of the present application, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application shall be subject to the attached claims.

Claims

1. An antenna assembly, characterized in that: include: A feeder line, used for transmitting a feed signal from a feed source; A radiation unit connected to the feeder, wherein the radiation unit is provided with a gap penetrating along a thickness direction; Among them, the radiation unit is used to send and receive electromagnetic wave signals under the stimulation of the feeding signal. The electromagnetic wave signals radiated by the radiation unit can cover the communication frequency bands corresponding to multiple wireless communication networks, and the effective communication distances of the multiple wireless communication networks are not exactly the same.

2. The antenna assembly according to claim 1, characterized in that: The slot includes a plurality of slot segments, and the extension directions of the plurality of slot segments on the surface of the radiation unit are not completely the same.

3. The antenna assembly according to claim 2, characterized in that: The outer contour of the slot is a cross.

4. The antenna assembly according to claim 1, characterized in that: The size of the gap in the first direction and the size of the gap in the second direction are within the same preset range; The first direction is perpendicular to the second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the radiation unit.

5. The antenna assembly according to any one of claims 1 to 4, characterized in that: The number of the radiation units is two, and the two radiation units are used to synchronously transmit and receive electromagnetic wave signals under the stimulation of the feeding signal; The two radiation units are arranged axially symmetrically, and the axis of symmetry is parallel to the extension direction of the feed line.

6. The antenna assembly according to claim 1, characterized in that: The outer contour of the radiation unit is an isosceles triangle, and the feed line is connected to the vertex of the isosceles triangle.

7. The antenna assembly according to any one of claims 1 to 4, characterized in that: The antenna assembly comprises a radiation layer, a dielectric layer and a reflection layer which are stacked: The plurality of radiation units are all disposed in the radiation layer, and the radiation units are sheet-like structures extending in the radiation layer; The dielectric layer is used to isolate the radiation layer and the reflection layer; The reflective layer is used to reflect the electromagnetic wave signal from the radiation unit so that the reflected electromagnetic wave signal is emitted along a target direction, and the target direction is a direction from the reflective layer to the radiation layer.

8. The antenna assembly according to claim 7, characterized in that: The reflective layer is provided with a reflective area and a clearance area, the portion of the reflective layer located in the reflective area is made of a metal material, and the portion of the reflective layer located in the clearance area is made of the same dielectric material as the dielectric layer; Wherein, the orthographic projection of the radiation unit on the reflective layer at least partially falls within the reflective area.

9. A wearable device, characterized in that: include: A housing, wherein the housing is formed by the housing; A feed source is arranged in the receiving space of the shell; The antenna assembly according to any one of claims 1 to 8 is mechanically connected to the housing and electrically connected to the feed source.

10. The wearable device according to claim 9, characterized in that: The shell is provided with a cavity, the cavity is arranged close to the outer surface of the shell, and the antenna assembly is accommodated in the cavity; or The antenna assembly is attached to the outer surface of the shell.

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