Antenna structure and smart wearable glasses

Abstract

The application discloses an antenna structure and smart wearing glasses, relates to the technical field of antennas, and discloses an antenna structure which is applied to smart wearing glasses. The smart wearing glasses comprise a frame, and the antenna structure comprises a carrier, a first side surface and a second side surface of the carrier are oppositely arranged, the first side surface is fixed to the frame, a first branch device is arranged on the second side surface, and a second branch device is arranged on the second side surface and is arranged at intervals between the first branch device and the second branch device. In a symmetrical dipole mode, the first branch device and the second branch device are two different antenna array arms respectively. In a monopole mode, the second branch device is an antenna ground, and the first branch device is an antenna array arm. The application can improve the antenna efficiency of the smart wearing glasses.

Description

Technical Field

[0001] The present application relates to a specific field of antenna technology, and in particular to antenna structures and smart wearable glasses. Background Art

[0002] With the rapid development of smart wearable glasses, such as AR glasses, miniaturization and lightweighting have become the main development trends of AR glasses. These characteristics have put higher requirements on the hardware performance, structure, heat dissipation, appearance and other aspects of AR glasses.

[0003] Traditional AR glasses have antennas located inside the temples and on the edges of the frames. However, antennas located inside the temples are closer to the human body, causing SAR (Specific Absorption Rate) to exceed standards. While antennas located on the edges of the frames don't exceed SAR standards, they require extremely narrow frames to meet the miniaturization and lightweight requirements of AR glasses. This restricts antenna size, making it difficult to achieve multi-frequency coverage of low- and high-frequency operating bands within the confined frame. Consequently, it's impossible to achieve miniaturization and lightweight AR glasses while simultaneously covering multiple operating bands, leading to low antenna efficiency.

[0004] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide an antenna structure and smart wearable glasses, aiming to solve the technical problem of how to improve the efficiency of the antenna of smart wearable glasses.

[0006] To achieve the above objectives, the present application proposes an antenna structure for use in smart wearable glasses. The smart wearable glasses include a frame, and the antenna structure includes:

[0007] a carrier, the carrier having a first side surface and a second side surface opposite to each other, the first side surface being fixed to the mirror frame;

[0008] a first branch device, the first branch device being arranged on the second side surface;

[0009] a second branch device, the second branch device being arranged on the second side surface, and the first branch device and the second branch device being arranged at an interval;

[0010] Wherein, in the symmetrical dipole mode, the first branch device and the second branch device are two different antenna array arms;

[0011] In the monopole mode, the second branch device is an antenna ground, and the first branch device is an antenna element arm.

[0012] In one embodiment, the shape of the carrier is adapted to the frame;

[0013] The second branch device is arranged close to the side of the carrier;

[0014] The first branch device is arranged on the other side away from the side of the carrier.

[0015] In one embodiment, the first branch device includes:

[0016] a first branch, the first branch being disposed on the second side surface;

[0017] a third branch, the third branch being disposed on the second side surface, and the first branch being connected end to end to the third branch;

[0018] The fourth branch node, the third branch node is arranged on the second side surface, and one end of the fourth branch node is connected to the tail of the first branch node and the third branch node, and the other end of the fourth branch node is bent and arranged in the space formed by the first branch node and the third branch node.

[0019] In one embodiment, the length of the first branch is greater than the length of the third branch, and the length of the third branch is greater than the length of the fourth branch.

[0020] In one embodiment, the second branch device includes:

[0021] The second branch is arranged on the second side surface, and a gap is formed between the second branch and the first branch.

[0022] In one embodiment, the second branch includes:

[0023] an impedance matching portion, wherein a gap is formed between the impedance matching portion and the first branch device;

[0024] A bending portion, one end of which is connected to the impedance matching portion, and the other end of which is bent around the side of the carrier.

[0025] In one embodiment, the bent portion is bent into a U-shape.

[0026] In one embodiment, the antenna structure further includes:

[0027] A coaxial line is provided on the second side surface, and the first branch device, the coaxial line and the second branch device are connected in sequence.

[0028] In one embodiment, the coaxial line comprises:

[0029] an outer conductor connected to the first branch device;

[0030] An inner conductor is connected to the second branch device.

[0031] In addition, to achieve the above-mentioned purpose, the present application also proposes a pair of smart wearable glasses, which include:

[0032] Frames;

[0033] The antenna structure as described in any of the above items is arranged at the bottom of the frame.

[0034] In an embodiment of the present application, by setting the antenna structure in the frame of the smart wearable glasses, the antenna structure can be adapted to the frame of the smart wearable glasses, and then it can be ensured that the antenna structure can meet the requirements of extremely narrow frames in order to achieve the lightweight and miniaturization requirements of the smart wearable glasses. The antenna structure also includes a carrier, the first side surface of the carrier is fixed to the frame of the smart wearable glasses, and the second side surface of the carrier is provided with a first branch device and a second branch device arranged at intervals. Therefore, the first branch device and the second branch device in the antenna structure can be fixed on the frame, and can meet the requirements of extremely narrow frames. In the symmetrical dipole mode, the first branch device and the second branch device are two different antenna array arms, respectively, and the symmetrical dipole mode is usually frequently used in the low frequency band. Therefore, the antenna structure can meet the requirements of the extremely narrow frame while also covering the low frequency band and meeting the low frequency signal requirements of the smart wearable glasses without the need for additional grounding design. In the monopole mode, the first branch device is the antenna ground, and the second branch device is the antenna array arm. The monopole mode is often used in high-frequency bands, meeting the high-frequency signal requirements of smart wearable glasses. Therefore, by setting up an antenna structure in the frame of smart wearable glasses, it is possible to meet the lightweight and miniaturization requirements of smart wearable glasses while also covering multiple operating frequency bands, thereby improving the efficiency of the smart wearable glasses antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 A schematic diagram of a scenario in which the antenna structure of this application is set up in the frame of smart wearable glasses;

[0038] Figure 2 A schematic diagram of a structure of the antenna structure of this application;

[0039] Figure 3 This is another schematic diagram of the antenna structure of this application;

[0040] Figure 4 This is a schematic structural diagram of the second branch in the antenna structure of this application;

[0041] Figure 5 This is a schematic diagram of the curve of the simulated input impedance of the antenna of this application changing with frequency;

[0042] Figure 6 This is a schematic diagram of a curve showing the simulated input impedance changing with frequency when the antenna structure of the present application includes the first branch;

[0043] Figure 7 This is a schematic diagram of a curve showing the simulated input impedance changing with frequency when the antenna structure of the present application includes a third branch;

[0044] Figure 8 The surface current distribution diagram of the antenna of this application at 2.4GHz frequency;

[0045] Figure 9 This is the surface current distribution diagram of the antenna in this application at 5GHz frequency;

[0046] Figure 10 This is the surface current distribution diagram of the antenna in this application at a frequency of 6 GHz.

[0047] Figure 11 For this application, the antenna is in free space and under human head conditions. 1,1 Schematic diagram of the curve changing with frequency;

[0048] Figure 12 This is a schematic diagram of the curve of the efficiency of the antenna of this application changing with frequency in free space and under human head conditions;

[0049] Figure 13 This is a schematic diagram of the SAR simulation results of the antenna in this application at a frequency of 2.45 GHz;

[0050] Figure 14 This is a schematic diagram of the SAR simulation results of the antenna in this application at 5GHz frequency;

[0051] Figure 15 This is a schematic diagram of the SAR simulation results of the antenna in this application at 6GHz frequency.

[0052] Description of Figure Numbers:

[0053] name Label name Label carrier 100 The first branch device 200 Second branch device 300 Coaxial cable 400 First branch 210 Second branch 310 The third branch 220 The fourth branch 230 Impedance matching section 311 Bending part 312 Outer conductor 410 Inner conductor 420

[0054] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0056] In order to better understand the technical solutions of this application, the following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0057] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0058] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0059] As lightweighting and miniaturization are the current development trends for smart wearable glasses, such as AR glasses, the resulting limited internal space has led to widespread interest in glasses with extremely narrow frames. AR glasses are complex systems that include multiple components, including optical displays, sensors, antennas, circuits, and storage. The extremely small internal space places high demands on the size and weight of hardware modules, especially the antenna.

[0060] The antennas of AR glasses are usually located inside the temples and on the edges of both sides of the frame. First, the antennas inside the temples require a certain amount of clearance, which is inconsistent with the miniaturization requirements of AR glasses. At the same time, the temple antennas are close to the human body, and there is a problem of exceeding the SAR (Specific Absorption Rate) standard. Secondly, since the frame antennas are far away from the human body, the SAR is small, which can meet the IEEE C95.1-2019 standard requirement of SAR less than 1.6W / kg (average value for 1g of human tissue). However, the requirement of the extremely narrow frame limits the size of the antenna and increases the difficulty of antenna design. It is difficult to achieve multi-frequency inside the narrow frame to cover the operating frequency bands of WIFI6 and WIFI7, for example. In addition, since the space allowed for antenna design inside AR glasses is limited, the antenna needs to be grounded to achieve a lower operating frequency to extend the electrical length of the antenna. However, the grounding process requires the design of additional structures, which increases the complexity and volume of the antenna, and is also inconsistent with the miniaturization and lightweight requirements of AR glasses.

[0061] Therefore, in this embodiment, a miniaturized, multi-frequency antenna for smart wearable devices is provided. The antenna in this embodiment can achieve a lower operating frequency without additional grounding, reducing the complexity and volume of the antenna design. Optionally, the antenna can have a narrower width and can be adapted to the extremely narrow frame of smart wearable glasses. Optionally, the antenna implements a multi-frequency design and can cover multiple frequency bands of WiFi, namely the 2.4GHz band (2.4-2.485GHz) and the 5GHz band (5.15-5.85GHz), meeting the requirements of WiFi6 for antenna operating frequency bands. Optionally, the antenna is located at the bottom of the frame, away from the human body, and the antenna has a high efficiency (greater than -2.6dB), and the SAR value is less than 0.8W / kg, which is far below the international standard requirements.

[0062] The present application proposes an antenna structure.

[0063] Please refer to Figure 1 In the first embodiment of the antenna structure proposed in this application, the antenna structure is applied to smart wearable glasses, which include a frame. Figure 2 The antenna structure includes: a carrier 100, a first branch device 200, and a second branch device 300.

[0064] Optionally, the carrier 100 has a first side surface and a second side surface that are oppositely disposed, and the first side surface is fixed to the frame;

[0065] A first branch device 200, the first branch device 200 is disposed on the second side surface;

[0066] A second branch device 300, the second branch device 300 is arranged on the second side surface, and the first branch device 200 and the second branch device 300 are arranged at intervals;

[0067] In the symmetrical dipole mode, the first branch device 200 and the second branch device 300 are two different antenna element arms respectively;

[0068] In the monopole mode, the second branch device 200 serves as the antenna ground, and the first branch device 300 serves as the antenna element arm.

[0069] In this embodiment, the smart wearable device may include AR glasses (augmented reality glasses), VR glasses (virtual reality glasses), MR glasses (mixed reality glasses), etc.

[0070] Optionally, the carrier 100 can be a substrate, which is the basic material that constitutes the bottom layer of the antenna structure. The substrate can be PI (Polyimide). Since PI is a high-performance engineering plastic with excellent high temperature resistance, chemical corrosion resistance, high mechanical strength and excellent dielectric properties, it is particularly suitable for use as a substrate for high-frequency antennas. Therefore, when the antenna structure in this embodiment uses PI as the carrier 100, it can provide the necessary physical support for the antenna and can also affect the electrical performance of the antenna, such as the dielectric constant and dissipation factor. These parameters are directly related to key indicators such as the antenna's resonant frequency, bandwidth and radiation efficiency. Optionally, the thickness of the carrier 100 can be set to 0.1 mm.

[0071] Optionally, the carrier 100 can be fixed to the frame of the smart wearable glasses, for example, by affixing it to the frame using optical adhesive or other methods. Alternatively, the carrier 100 can be fixed to the frame of the smart wearable glasses using other methods. Optionally, the width of the carrier 100 is less than or equal to the width of the frame. Optionally, the first side surface of the carrier 100 can be fixed to the frame.

[0072] In addition, in order to consider that the antenna in smart wearable glasses can cover more operating frequency bands, such as high frequency band, low frequency band, etc., so that the antenna can support multiple frequency bands, the antenna structure can be designed.

[0073] Optionally, an antenna may be provided on the second side surface of the carrier 100, such as a first branch device 200 and a second branch device 300 spaced apart on the second side surface. That is, the first branch device 200 and the second branch device 300 are not adjacent to each other.

[0074] Optionally, the first branch device 200 may be provided with at least one branch for adjusting the antenna frequency and / or impedance. The second branch device 300 may be provided with at least one branch for adjusting the antenna frequency and / or impedance.

[0075] Alternatively, branches can be specific structural elements within the antenna structure, forming a key component of the overall antenna structure. Each branch has its own unique length and width, as well as its role within the antenna structure. Through the different combinations and configurations of these branches, the antenna can achieve specific electrical performance and operating modes, and can also cover a wider range of operating frequency bands, such as low and high frequency bands.

[0076] Optionally, the symmetrical dipole mode and the monopole mode may be two operating modes of the antenna, and both modes are applicable to high frequency bands and low frequency bands.

[0077] Optionally, when the antenna structure is in a symmetrical dipole mode, the antenna structure may be a symmetrical dipole antenna, and the first branch device 200 and the second branch device 300 are two different antenna element arms.

[0078] Alternatively, in a symmetrical dipole antenna, the two antenna elements are of equal length, open at both ends, and fed in the middle. When current flows through the symmetrical dipole antenna, a standing wave current distribution is generated along the antenna's arm span. The length of each antenna element is typically an integer multiple of half a wavelength, such as 1 / 4 wavelength or 1 / 2 wavelength.

[0079] Optionally, when the antenna structure is in monopole mode, the antenna structure can be a single-pole sub-antenna, with the second branch device 300 serving as the antenna ground and the first branch device 200 serving as the antenna element arm. Alternatively, the antenna ground can be the ground feed portion of the antenna. Alternatively, the antenna ground can be connected to a larger conductive surface, such as the ground.

[0080] Optionally, the monopole sub-antenna can be regarded as half of a symmetrical dipole antenna. When current flows in the monopole sub-antenna, a radiation field similar to a symmetrical dipole is formed through the second branch device 300 and the ground plane.

[0081] In addition, in one scenario embodiment, a shell can be provided that is consistent with the material of the frame and consistent with the size and shape of the antenna structure. After the antenna structure is fixed on the smart wearable glasses, the shell can be covered on the antenna structure and connected to the frame, thereby ensuring the aesthetics of the smart wearable glasses.

[0082] In this embodiment, by setting the antenna structure in the frame of the smart wearable glasses, the antenna structure can be adapted to the frame of the smart wearable glasses, and then it can be ensured that the antenna structure can meet the requirements of extremely narrow frames in order to achieve the lightweight and miniaturization requirements of the smart wearable glasses. The antenna structure also includes a carrier 100, the first side surface of the carrier 100 is fixed to the frame of the smart wearable glasses, and the second side surface of the carrier 100 is provided with a first branch device 200 and a second branch device 300 arranged at intervals. Therefore, the first branch device 200 and the second branch device 300 in the antenna structure can be fixed on the frame, and can meet the requirements of extremely narrow frames. In addition, in the symmetrical dipole mode, the first branch device 200 and the second branch device 300 are two different antenna array arms, and the symmetrical dipole mode is usually frequently used in the low frequency band. Therefore, the antenna structure can meet the requirements of the extremely narrow frame while also covering the low frequency band and meeting the low frequency signal requirements of the smart wearable glasses, without the need for additional grounding design. In monopole mode, the first branch device 200 serves as the antenna ground, and the second branch device 300 serves as the antenna element arm. The monopole mode is typically used in high-frequency bands, meeting the high-frequency signal requirements of smart wearable glasses. Therefore, by integrating the antenna structure into the frame of the smart wearable glasses, it is possible to achieve a solution that not only meets the lightweight and miniaturized requirements of the smart wearable glasses, but also covers multiple operating frequency bands, thereby improving the efficiency of the smart wearable glasses antenna.

[0083] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned first embodiment can be referred to the above introduction and will not be described in detail. On this basis, in the second embodiment of the antenna structure.

[0084] The shape of the carrier 100 is adapted to the frame;

[0085] The second branch device 300 is disposed close to the side of the carrier 100;

[0086] The first branch device 200 is disposed on the other side away from the side of the carrier 100 .

[0087] In this embodiment, the shape of the carrier 100 must be compatible with the frame to prevent it from exceeding the frame's limits when secured to the frame, thereby affecting the aesthetics of the smart wearable glasses. Furthermore, to achieve lightweight and miniaturized smart glasses, the frames of the smart glasses must meet certain requirements, namely, extremely narrow frames. Therefore, to ensure that the antenna structure also meets these requirements, the shape of the carrier 100 is adapted to the frame, and the length and width of the carrier 100 are both within the length and width range of the frame.

[0088] Optionally, the side edge of the second side surface of the carrier 100 can be determined, and the second branch device 300 can be placed close to the side edge of the carrier 100, and the first branch device 200 can be set on the other side away from the side edge of the carrier 100, so that the first branch device 200 and the second branch device 300 are not repeatedly set in the same position.

[0089] Optionally, since when the antenna structure is in the monopole mode, the second branch device 300 is the antenna ground and the first branch device 200 is the antenna element arm, the antenna structure is in the first branch device 200 and the second branch device 300 are two different antenna element arms. When the second branch device 300 is the antenna ground, it needs to contact a larger conductive plane. Therefore, the second branch device 300 can be set on the side close to the carrier 100. Optionally, the side of the carrier 100 can be the side close to the connection between the frame and the temple. The space between the frame and the temple is larger, which is conducive to the design of the antenna ground. Optionally, since the second branch device 300 and the first branch device 200 are aligned with the gap. Therefore, the first branch device 200 can be set on the other side of the side away from the carrier 100. Optionally, since the first branch device 200 and the second branch device 300 are both on the second side surface of the carrier 100, the first branch device 200 is set on the other side of the side away from the second side surface of the carrier 100. And the other side of the side can be used as the other side of the carrier 100 .

[0090] In this embodiment, the carrier 100 is shaped to match the frame, and the second branch device 300 is disposed close to a side edge of the carrier 100, while the first branch device 200 is disposed on the other side away from the carrier 100. This allows the shape of the antenna structure to meet the requirements of the frame, thereby achieving miniaturization and lightweighting of the smart wearable glasses while ensuring that the antenna meets the requirements of an extremely narrow frame.

[0091] In one possible embodiment, referring to Figure 3 The first branch device 200 includes a first branch 210 , a third branch 220 , and a fourth branch 230 .

[0092] Optionally, the first branch 210 is provided on the second side surface;

[0093] The third branch 220 is provided on the second side surface, and the first branch 210 and the third branch 220 are connected end to end;

[0094] The fourth branch 230 is arranged on the second side surface, and one end of the fourth branch 230 is connected to the tail of the first branch 210 and the third branch 220, and the other end of the fourth branch 230 is bent in the space formed by the first branch 210 and the third branch 220.

[0095] In the embodiment, the first branch 210 can work in the symmetrical array mode, the third branch 220 can work in the monopole mode, and the fourth branch 230 can adjust the high-frequency resonance frequency of the antenna.

[0096] Optionally, in the first branch device 200, the first branch 210 and the third branch 220 arranged on the second side surface of the carrier 100 are connected end to end, the fourth branch 230 is connected to the tail of the first branch 210 and the third branch 220, and the other end of the fourth branch 230 is arranged in a bent manner in the space formed by the first branch 210 and the third branch 220, and is open, in an open state.

[0097] Optionally, when the length of the antenna is 39 mm and the width is 4.3 mm, the length of the carrier 100 can be set to 39 mm and the width can be set to 4.3 mm, the length of the first branch 210 can be set to 20.6 mm and the width can be set to 0.5 mm, and the first branch 210 can work in the symmetrical array mode. At a low frequency, the electrical length of the first branch 210 is one-quarter of the wavelength, thereby helping to generate a resonance point near 2.8 GHz. At a high frequency, the first branch 210 can be combined with the fourth branch 230 to generate another resonance point at a frequency of 5 GHz, and at this time, the first branch 210 works in the symmetrical array mode.

[0098] Optionally, the third branch 220 can be set to a length of 17.5 mm and a width of 0.5 mm, and can work in the monopole mode. The third branch 220 can be combined with the fourth branch 230 to generate a new resonance point at a frequency of 6.25 GHz, thereby helping to expand the working frequency range of the antenna.

[0099] Optionally, the fourth branch 230 can be set to a length of 6.2 mm and a width of 0.5 mm. The fourth branch 230 can adjust the high-frequency resonance frequency of the antenna, and cooperate with the first branch 210 and the third branch 220 to achieve resonance at different frequencies.

[0100] Optionally, the first branch device 200 can only include the first branch 210, or only include the first branch 220 and the fourth branch 230. It can also only include the third branch 220, or only include the third branch 220 and the fourth branch 230.

[0101] In the embodiment, the first branch device 200 includes the first branch 210, the third branch 220 connected end to end with the first branch 210, the fourth branch 230 connected to the tail of the first branch 210 and the third branch 220, and the other end of the fourth branch 230 arranged in a bent manner in the space formed by the first branch 210 and the third branch 220. Thus, the antenna can be adapted to multiple modes, thereby covering more frequency bands and improving the efficiency of the antenna.

[0102] In a feasible embodiment, the length of the first branch 210 is greater than the length of the third branch 220 , and the length of the third branch 220 is greater than the length of the fourth branch 230 .

[0103] Optionally, to enable the antenna structure to cover different frequency bands, the first branch 210 and the third branch 220 can be configured with different lengths to accommodate different modes. For example, the first branch 210 can operate in a symmetrical dipole mode, while the third branch 220 can operate in a single-pole mode. Furthermore, the fourth branch 230 can be configured with different lengths to adjust the high-frequency resonant frequency of the antenna based on the fourth branch.

[0104] Optionally, it should be noted that the length of the first branch 210 is greater than the length of the third branch 220. For example, the length of the first branch 210 can be set to 20.6 mm, and this length includes the length of the bent portion of the first branch 210. The length of the third branch 220 can be set to 17.5 mm, and this length includes the length of the bent portion of the third branch 220.

[0105] Optionally, the length of the third branch 220 is greater than that of the fourth branch 230. Therefore, the length of the fourth branch 230 can be set to 6.2 mm, and this length includes the length of the bent portion of the fourth branch 230.

[0106] Optionally, to avoid errors, the widths of the first branch 210, the third branch 220, and the fourth branch 230 may be the same. The thicknesses of the first branch 210, the third branch 220, and the fourth branch 230 may also be set to be the same.

[0107] In this embodiment, by setting branches of different lengths, and the lengths are the length of the first branch 210, the length of the third branch 220 and the length of the fourth branch 230, the frequency can be adjusted according to the lengths of different branches to achieve coverage of more frequency bands and improve the efficiency of the antenna.

[0108] In one possible embodiment, referring to Figure 3 The second branch device 300 includes: a second branch 310.

[0109] Optionally, the second branch 310 is disposed on the second side surface, and a gap is formed between the second branch 310 and the first branch device 200 .

[0110] Optionally, a gap is formed between the second branch 310 and the first branch device 200 formed by the first branch 210 , the third branch 220 and the fourth branch 230 . Optionally, the second branch 310 is disposed close to a side of the carrier 100 .

[0111] Optionally, the second branch 310 is open in the opposite direction to the first branch 210 , the third branch 220 and the fourth branch 230 .

[0112] Optionally, the first, second, third, and fourth branches 210, 310, 220, and 230 can be configured with different lengths and operating modes to work together to form a multi-band antenna design, enabling coverage of different frequency bands (e.g., the 2.4 GHz and 5 GHz WiFi bands). This sophisticated branch design not only meets the requirements of miniaturization but also optimizes antenna performance, such as improving efficiency, broadening the operating frequency band, and reducing the SAR impact on the human head.

[0113] In one possible embodiment, referring to Figure 4 The second branch 310 includes an impedance matching portion 311 and a bending portion 312 .

[0114] Optionally, the impedance matching portion 311 , and a gap is formed between the impedance matching portion 311 and the first branch device 200 ;

[0115] The bending portion 312 has one end connected to the impedance matching portion 311 , and the other end of the bending portion 312 is bent around the side of the carrier 100 .

[0116] Optionally, the second branch 310 serves as a part of the symmetrical dipole mode in the low frequency band and serves as an antenna ground in the high frequency band, affecting the input impedance matching of the antenna.

[0117] Optionally, the impedance matching portion 311 can adjust the impedance at different frequencies. That is, impedance matching portions of different areas can correspond to impedances at different frequencies. The bend 312 can adjust both the impedance and frequency at the same frequency. For example, the length of the bend 312 can be configured differently, such as to meet user needs.

[0118] Optionally, the impedance matching portion 311 may be set to have a length of 5.8 mm and a width of 3.9 mm. The bending portion 312 may be set to have a length of 19.5 mm and a width of 1.3 mm, wherein the length of the bending portion 312 includes the length of the bending portion.

[0119] In a feasible embodiment, the bent portion 312 is bent into a U-shape.

[0120] Optionally, when the bending portion 312 is bent around the side of the carrier 100 , it is bent into a U-shape, that is, one end of the bending portion 312 is connected to the impedance matching portion 311 , and the other end is open.

[0121] In the embodiment, by setting the second branch 310 in the second branch device 300, and the second branch 310 comprising the impedance matching part 311 and the bending part 312, then the impedance adjustment can be performed according to the impedance matching part, and the frequency adjustment can be performed according to the bending part, so as to improve the working efficiency of the antenna.

[0122] Based on the first embodiment or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as the above first embodiment or the second embodiment can be referred to the above description, and will not be described hereinafter. On this basis, in the third embodiment of the antenna structure, referring to Figure 2 , the antenna structure further comprises: a coaxial line 400.

[0123] Optionally, the coaxial line 400 is arranged on the second side surface, and the first branch device 200, the coaxial line 400 and the second branch device 300 are sequentially connected.

[0124] Optionally, since the first branch device 200 and the second branch device 300 are arranged at intervals, there is a gap between the two, so the coaxial line 400 can be arranged at the gap between the two. On the second side surface of the carrier 100, the first branch 210 in the first branch device 200 can be connected with the coaxial line 400. The second branch 310 of the second branch device 300 can be connected with the coaxial line 400.

[0125] Optionally, the coaxial line 400 can realize signal transmission. The coaxial line 400 is a physical path for signal transmission from the transmitter or receiver to the antenna, which can efficiently transmit radio frequency signals and improve shielding to reduce electromagnetic interference around radio frequency interference. Optionally, the coaxial line 400 is part of the antenna structure, and there is a feeding mechanism, which can realize multi-band operation.

[0126] In a possible embodiment, referring to Figure 3 , the coaxial line 400 comprises: an outer conductor 410 and an inner conductor 420.

[0127] Optionally, the outer conductor 410 is connected with the second branch device 300;

[0128] The inner conductor 420 is connected with the first branch device 200.

[0129] After the embodiment, the inner conductor 420 can adopt a material with high conductivity to effectively transmit signals such as electrical signals. Optionally, the material of the inner conductor 420 can be solid copper wire, copper-coated steel wire or silver-plated copper wire.

[0130] Optionally, the outer conductor 410 can provide shielding to prevent external electromagnetic interference from affecting signal instructions, and also serve as part of the return circuit to guide current.

[0131] Alternatively, the outer conductor 410 may be a braided mesh woven from fine copper wires, a continuous layer of copper foil, a copper tube, or a copper strip.

[0132] Optionally, in the antenna structure configuration for smart wearable glasses, to achieve the miniaturization and lightweight requirements of the smart wearable glasses, both the inner conductor 420 and the outer conductor 410 of the coaxial line 400 can be made of lightweight and highly conductive materials, while also taking into account cost and manufacturing feasibility. Therefore, the inner conductor 420 can be made of thin copper wire or silver-plated copper wire to optimize signal transmission, while the outer conductor 410 can be made of a more flexible and well-shielded braided mesh or thin copper foil structure to ensure good electromagnetic compatibility without increasing excessive volume and weight.

[0133] Optionally, on the second side surface of the carrier 100, the outer conductor 410 can be connected to the second branch 310 in the second branch device 300, and the inner conductor 420 can be connected to the first branch 210 in the first branch device 200. Furthermore, the inner conductor 420 is indirectly connected to the third branch 220 and the fourth branch 230 through the first branch 210. Optionally, in the low frequency band, the first branch 210 works together with the outer conductor 410 of the coaxial cable 400, and in the high frequency band, the fourth branch 230 cooperates with the inner conductor 420 of the coaxial cable 400 to adjust the frequency. Furthermore, the coaxial cable 400 can assist the antenna in switching between the symmetrical dipole mode and the single-pole submode.

[0134] In this embodiment, by setting a coaxial line 400 in the antenna structure, connecting the outer conductor 410 of the coaxial line 400 to the second branch device 300, and connecting the inner conductor 420 to the first branch device 200, mode switching and frequency adjustment can be achieved according to the coaxial line 400, so that the antenna can cover more frequency bands and improve the efficiency of the antenna.

[0135] In addition, to achieve the above-mentioned purpose, the embodiment of the present application further provides a smart wearable glasses, which includes:

[0136] Frames;

[0137] Like the antenna structure in any of the above embodiments, the antenna structure is disposed at the bottom of the frame.

[0138] Optionally, the frame material of the smart wearable glasses can be plastic or metal. When the frame material is metal, the local area of ​​the frame around the antenna is replaced with plastic.

[0139] In addition, in order to better illustrate the inventive concept of the present application, the specific simulation application of the antenna structure is described below in conjunction with specific embodiments.

[0140] Reference Figure 5 , which shows the curve of the simulated input impedance of the antenna in this embodiment changing with frequency. A coordinate system is constructed using input impedance (ohm) and frequency (GHz), with the horizontal coordinate system being incremented by 0.5 from at least 2 to 8. The vertical coordinate system being incremented by 100 from at least -400 to 400. This graph contains both real and imaginary curves, confirming that the antenna has three distinct resonant points: resonant point 1 at 2.5 GHz, resonant point 2 at 5.5 GHz, and resonant point 3 at 6.6 GHz.

[0141] Optionally, the input impedance of different loaded branches can be simulated, such as Figure 6 As shown in FIG, when the antenna has only the first branch 210, the simulated input impedance changes with frequency. The coordinate system of this curve is the same as Figure 5 The coordinate system in is consistent. And in Figure 6 Therefore, it can be determined that when the antenna only has the first branch 210, that is, when only the first branch 210 is working, the resonance point 1 is around 2.8 GHz and the resonance point 2 is around 4.9 GHz.

[0142] Alternatively, as Figure 7 As shown, Figure 7 The coordinate system in the above Figure 5-Figure 6 The coordinate system in is consistent, and there are two curves for the real part and the imaginary part. When the antenna only has the third branch 220 and the fourth branch 230, that is, when only the third branch 220 and the fourth branch 230 are working, the resonance point 1 is near 2.8 GHz, and the resonance point 2 is near 6.25 GHz. Therefore, both the first branch 210 and the second branch 220 will generate the resonance point 1 at a low frequency. At this time, the electrical length of the first branch 210 is one quarter of a wavelength, and it works in a symmetrical oscillator mode, and the surface current distribution of the first branch 210 can be as follows Figure 8 shown.

[0143] Optionally, in the high frequency band, the first branch 210 will generate a resonance point 2 at 5 GHz. At this time, the surface current distribution of the first branch 210 can be as follows: Figure 9 As shown. At this time, the length of the first branch 210 plus the fourth branch 230 is 26.8mm, corresponding to a dielectric wavelength of 0.75λg at 5GHz, and also works in a symmetrical oscillator mode. Optionally, a new resonance point can be generated at 6.25GHz by introducing the third branch 220. The surface current distribution of the antenna near this frequency point is shown as follows: Figure 10 At this time, the length of the third branch 220 plus the fourth branch 230 is 23.7 mm, corresponding to a medium wavelength of about 0.75λg at 6 GHz, and working in a monopole mode.

[0144] Alternatively, as Figure 11As shown, including antenna free space simulation S 1,1 The curves change with frequency, including the curves corresponding to free space and the curves corresponding to the human head. 1,1 The operating frequency bands with |≤-7.5dB are 2.28GHz-2.87GHz and 5GHz-6.09GHz. Compared with free space, it has a wider operating bandwidth, |S 1,1 |≤-7.5dB operating frequency bands are 2.26GHz-2.76GHz and 4.91GHz-6.18GHz. In addition, compared with traditional LOOP, dipole, monopole and other terminal antennas, this antenna has a narrower width (only 4mm). Working bandwidth, suitable for installation in the extremely narrow frames of AR glasses. The working frequency bands required by the WIFI 6 protocol are 2.4GHz (802.11b / g, frequency range 2.400GHz to 2.4835GHz) band and 5GHz (802.11a, frequency range 5.150GHz to 5.825GHz) band. The working frequency bands of the antenna in this embodiment can cover mobile communication bands such as wifi6.

[0145] Alternatively, as Figure 12 As shown, the efficiency variation curves of the antenna simulation in free space and under human head conditions vary with frequency, including the curve corresponding to free space and the curve corresponding to the human head. For multi-band Wi-Fi mobile terminal products, the antenna efficiency is generally required to be greater than -5dB. Taking into account the influence of the human head, in this embodiment, the antenna efficiency is -2.25dB to -1.97dB in the 2.38GHz-2.5GHz frequency band; in the 5.05GHz-5.825GHz frequency band, the antenna efficiency is -1.86dB to -2.55dB, which is much higher than the communication index requirements. At the same time, compared with the results in the free space case, the maximum loss of antenna efficiency is 1.8dB. Compared with the traditional AR glasses antenna, the antenna proposed in this embodiment is less affected by the human head.

[0146] Optionally, Figures 13 to 15 Figure 2 shows the simulated SAR results for the antenna of this embodiment at 2.45 GHz, 5 GHz, and 6 GHz. The simulations were performed with an input power of 15 dBm and a calculation unit of 1 g. The SAR values ​​at 2.45 GHz were 0.34 W / kg, 0.7 W / kg at 5 GHz, and 0.89 W / kg at 6 GHz. The IEEE 1528-2013 standard requires a SAR value of less than 1.6 W / kg. This embodiment achieves a SAR value significantly lower than the international standard.

[0147] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An antenna structure, characterized in that: Applied to smart wearable glasses, the smart wearable glasses include a frame, and the antenna structure includes: a carrier, the carrier having a first side surface and a second side surface opposite to each other, the first side surface being fixed to the mirror frame; a first branch device, the first branch device being arranged on the second side surface; a second branch device, the second branch device being arranged on the second side surface, and the first branch device and the second branch device being arranged at an interval; Wherein, in the symmetrical dipole mode, the first branch device and the second branch device are two different antenna array arms; In the monopole mode, the second branch device is the antenna ground, the first branch device is the antenna element arm, and the antenna ground is the ground feed part of the antenna; The shape of the carrier is adapted to the frame; The second branch device is arranged close to the side of the carrier, and the side of the carrier is the side close to the connection between the frame and the temple; The first branch device is arranged on the other side away from the side of the carrier.

2. The antenna structure according to claim 1, wherein: The first branch device includes: a first branch, the first branch being disposed on the second side surface; a third branch, the third branch being disposed on the second side surface, and the first branch being connected end to end to the third branch; The fourth branch node, the third branch node is arranged on the second side surface, and one end of the fourth branch node is connected to the tail of the first branch node and the third branch node, and the other end of the fourth branch node is bent and arranged in the space formed by the first branch node and the third branch node.

3. The antenna structure according to claim 2, wherein: The length of the first branch is greater than that of the third branch, and the length of the third branch is greater than that of the fourth branch.

4. The antenna structure according to claim 1, wherein: The second branch device includes: The second branch is arranged on the second side surface, and a gap is formed between the second branch and the first branch.

5. The antenna structure according to claim 4, wherein: The second branch includes: an impedance matching portion, wherein a gap is formed between the impedance matching portion and the first branch device; A bending portion, one end of which is connected to the impedance matching portion, and the other end of which is bent around the side of the carrier.

6. The antenna structure according to claim 5, wherein: The bending portion is bent into a U shape.

7. The antenna structure according to any one of claims 1 to 6, characterized in that: The antenna structure further includes: A coaxial line is provided on the second side surface, and the first branch device, the coaxial line and the second branch device are connected in sequence.

8. The antenna structure according to claim 7, wherein: The coaxial line comprises: an outer conductor connected to the second branch device; An inner conductor is connected to the first branch device.

9. A smart wearable glasses, characterized in that: The smart wearable glasses include: Frames; The antenna structure according to any one of claims 1 to 8, wherein the antenna structure is arranged at the bottom of the mirror frame.

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