Wearable device
By setting a half-mode resonant cavity antenna element and a high-dielectric material filling medium on the fixed band, the problem of poor antenna radiation performance in wearable devices is solved, and good radiation performance and positioning effect are achieved under different wearing conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- VIVO MOBILE COMM CO LTD
- Filing Date
- 2022-09-30
- Publication Date
- 2026-06-26
AI Technical Summary
Wearable devices have a large number of metal components, which limits the space for antenna placement and affects radiation performance.
A half-mode resonant cavity antenna element and a high-dielectric material filling medium are set on a fixed strip to form a metal resonant cavity. The radiation direction of the antenna is adjusted by using the high-dielectric material filling medium, and the antenna performance is optimized by combining the slot structure.
The antenna's radiation performance has been improved, enabling good positioning results in different wearing conditions (such as walking and running), and reducing interference from the metal structure.
Smart Images
Figure CN115548663B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic product technology, and more particularly to a wearable device. Background Technology
[0002] With the development of electronic products, wireless communication functions can be realized in wearable devices. Currently, wearable devices typically house antennas (such as Global Positioning System (GPS) antennas) within the device body. However, because the device body usually contains numerous metal components, the space for antenna placement is limited, and these metal components can negatively impact the antenna's radiation performance. Therefore, existing technologies suffer from poor radiation performance in wearable devices. Summary of the Invention
[0003] This application provides a wearable device to address the problem of poor radiation performance in wearable devices.
[0004] In a first aspect, embodiments of this application provide a wearable device, including: a device body and a fixing strap, the device body being connected to the fixing strap, and the fixing strap being provided with a half-mode resonant cavity antenna element and a high-dielectric material filling medium.
[0005] The half-mode resonant cavity antenna unit includes a first metal layer, a second metal layer, and a metal connection structure. The distance from the first metal layer to the back of the fixing strip is less than the distance from the second metal layer to the back of the fixing strip. The metal connection structure is connected to the first metal layer and the second metal layer respectively. The first metal layer, the second metal layer, and the metal connection structure enclose a metal resonant cavity with an opening on one side. The opening of the metal resonant cavity faces the target side of the fixing strip. The second metal layer is provided with a slot for radiation.
[0006] The high-dielectric material filling medium is disposed between the target side and the opening of the metal resonant cavity;
[0007] The target side is either a first side or a second side, and the first side and the second side are two opposite sides of the fixing belt arranged along the length direction.
[0008] In this embodiment, a half-mode resonant cavity antenna element and a high-dielectric material filling medium are disposed on a fixed strip. The half-mode resonant cavity antenna element includes a first metal layer, a second metal layer, and a metal connection structure. The distance from the first metal layer to the back surface of the fixed strip is less than the distance from the second metal layer to the back surface of the fixed strip. The metal connection structure is connected to the first metal layer and the second metal layer respectively, and the first metal layer, the second metal layer, and the metal connection structure enclose a metal resonant cavity with an opening on one side. The opening of the metal resonant cavity faces the target side of the fixed strip. The second metal layer has a slot for radiation. The high-dielectric material filling medium is disposed between the target side and the opening of the metal resonant cavity. The target side is either the first side or the second side, and the first side and the second side are two opposite sides of the fixed strip along its length. This forms an antenna structure on the fixed strip. Since there is usually no interference from the metal structure on the fixed strip, the radiation performance of the antenna is improved. At the same time, the use of a half-mode resonant cavity antenna element and a high-dielectric material filling medium allows adjustment of the antenna's radiation direction, further improving the antenna's radiation performance.
[0009] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0010] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0011] Figure 1 This is one of the structural schematic diagrams of the wearable device provided in the embodiments of this application;
[0012] Figure 2 yes Figure 1 Another structural diagram of the wearable device;
[0013] Figure 3 This is an illustration showing the effect of wearing the wearable device provided in the embodiments of this application;
[0014] Figure 4 This is a second schematic diagram of the structure of the wearable device provided in the embodiments of this application;
[0015] Figure 5 yes Figure 4 A schematic diagram of the circuit structure of a wearable device in China;
[0016] Figure 6 This is the third schematic diagram of the wearable device provided in the embodiments of this application;
[0017] Figure 7 yes Figure 6 A schematic diagram of the circuit structure of a wearable device in China;
[0018] Figure 8 This is the fourth structural schematic diagram of the wearable device provided in the embodiments of this application;
[0019] Figure 9 yes Figure 8 A schematic diagram of the circuit structure of a wearable device in China;
[0020] Figure 10 This is the fifth structural schematic diagram of the wearable device provided in the embodiments of this application. Detailed Implementation
[0021] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0022] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0025] See Figures 1 to 9 This application provides a wearable device, which includes a device body 10 and a fixing strap 20. The device body 10 is connected to the fixing strap 20. The fixing strap 20 is provided with a half-mode resonant cavity antenna element 21 and a high-dielectric material filling medium 22.
[0026] The half-mode resonant cavity antenna element 21 includes a first metal layer 211, a second metal layer 212, and a metal connection structure 213. The distance from the first metal layer 211 to the back surface 201 of the fixing strip 20 is less than the distance from the second metal layer 212 to the back surface 201 of the fixing strip 20. The metal connection structure 213 is connected to the first metal layer 211 and the second metal layer 212 respectively. The first metal layer 211, the second metal layer 212, and the metal connection structure 213 enclose a metal resonant cavity with an opening on one side. The opening of the metal resonant cavity faces the target side of the fixing strip 20. The second metal layer 212 is provided with a slit 2121 for radiation.
[0027] The high-dielectric material filling medium 22 is disposed between the target side and the opening of the metal resonant cavity;
[0028] The target side is either the first side 202 or the second side 203, and the first side 202 and the second side 203 are two opposite sides of the fixing strap 20 arranged along the length direction.
[0029] To better understand this application, it is possible to establish, as follows: Figure 1 and Figure 2 The coordinate system shown can be interpreted as follows: the Z-axis direction can be understood as the thickness direction of the fixed belt 20, the X-axis direction can be understood as the width direction of the fixed belt 20, and the Y-axis direction can be understood as the length direction of the fixed belt 20.
[0030] In this embodiment of the application, the back surface 201 and the front surface of the fixing strap 20 can be understood as two opposing surfaces in the Z-axis direction, and the first side 202 and the second side 203 can be understood as two opposite sides in the X-axis direction. Figure 3As shown, when the wearable device is worn on the user's arm 100, the back surface 201 of the aforementioned fixing strap 20 can be understood as the surface of the fixing strap 20 that fits against the user's arm 100.
[0031] Optionally, the wearable device mentioned above can be a watch, smart bracelet, or other similar device, and is not further limited here. In the following embodiments, a watch is used as an example for detailed explanation. Considering the actual way users wear the device, taking the left hand as an example, when the user's arm swings significantly (running), the antenna radiation direction beneficial to the user experience should be concentrated near the 9 o'clock to 6 o'clock interval; when the arm swings less significantly (walking slowly), the antenna radiation direction beneficial to the user experience should be concentrated near the 9 o'clock position.
[0032] Optionally, the first metal layer 211, the second metal layer 212, and the metal connection structure 213 enclose a metal resonant cavity with an opening on one side. This can be understood as the side of the metal resonant cavity facing the target not having the metal connection structure 213. For example, the metal resonant cavity is roughly rectangular, with the second metal layer 212 as the top surface, the first metal layer 211 as the bottom surface, and surrounded on three sides by the metal connection structure 213. The side facing the target is an open environment (i.e., the aforementioned opening), which constitutes an equivalent perfect magnetic conductor (PMC) boundary. By filling the open environment with a high-dielectric filling medium, the surface waves generated by the high-dielectric filling medium cause the radiation direction of the half-mode resonant cavity antenna element to shift towards the high-dielectric filling medium, thereby causing the antenna pattern to be biased towards the target side. In this way, when a user wears the device, the antenna direction can be concentrated and biased towards a specified direction (such as the direction of 9 o'clock or the direction of the interval between 6 o'clock and 9 o'clock), thereby improving the antenna's radiation performance and enabling good positioning even when the user is walking or running.
[0033] It should be understood that the formula for calculating the resonant frequency of the aforementioned metal resonant cavity is as follows:
[0034]
[0035] Where m represents the number of half-wavelengths in the X direction, n represents the number of half-wavelengths in the Y direction, and p represents the number of half-wavelengths in the Z direction, i.e., m, n, and p represent the resonant modes of the resonant cavity; c represents the spacing between the first metal layer 211 and the second metal layer 212; a represents the length of the metal resonant cavity in the X direction, and b represents the length of the metal resonant cavity in the Y direction.
[0036] It should be noted that the resonant frequency of the metal resonant cavity can be changed by altering the values of a and b. A resonant cavity antenna can be formed by setting a slot 2121 on the second metal layer 212. The standing wave ratio and bandwidth of the entire antenna can be optimized by adjusting the position of the slot away from the center point of the metal resonant cavity (it cannot be placed at the center, as the center is the current zero point), adjusting the length and width of the slot, and adjusting the impedance.
[0037] Optionally, the antenna structure formed by the above-mentioned half-mode resonant cavity antenna element 21 can be a GPS antenna, or it can be used as other antennas, without further limitation.
[0038] Optionally, the first metal layer 211 can be disposed on the back surface 201 of the fixing band 20 or inside the fixing band 20; the second metal layer 212 can be disposed on the front surface of the fixing band 20 or inside the fixing band 20. Because the first metal layer 211 is disposed on or near the back surface 201 of the fixing band 20, and the second metal layer 212 is disposed on or near the front surface of the fixing band 20, with a gap 2121 in the second metal layer 212, the direction of antenna radiation is directed away from the human body, thereby avoiding interference from the human body and improving the antenna radiation performance.
[0039] Optionally, the aforementioned high-dielectric material filling medium can be understood as a filling medium of a material with a dielectric constant higher than that of SiO2. The specific material can be set according to actual needs without further limitation.
[0040] In this embodiment, a half-mode resonant cavity antenna element 21 and a high-dielectric material filling medium 22 are disposed on the fixing strip 20. The half-mode resonant cavity antenna element 21 includes a first metal layer 211, a second metal layer 212, and a metal connection structure 213. The distance from the first metal layer 211 to the back surface 201 of the fixing strip 20 is less than the distance from the second metal layer 212 to the back surface 201 of the fixing strip 20. The metal connection structure 213 is connected to the first metal layer 211 and the second metal layer 212 respectively, and the first metal layer 211... A second metal layer 212 and a metal connection structure 213 enclose a metal resonant cavity with an opening on one side, the opening of which faces the target side of the fixing strip 20. The second metal layer 212 has a slit 2121 for radiation. A high-dielectric material filling medium 22 is disposed between the target side and the opening of the metal resonant cavity. The target side is either a first side 202 or a second side 203, which are two opposite sides of the fixing strip 20 along its length. This forms an antenna structure on the fixing strip 20. Since there is typically no interference from a metal structure on the fixing strip 20, the antenna's radiation performance is improved. Simultaneously, the use of a half-mode resonant cavity antenna element and a high-dielectric material filling medium allows adjustment of the antenna's radiation direction, further enhancing its radiation performance.
[0041] It should be understood that the specific structure of the metal connection structure 213 can be set according to actual needs. For example, in some embodiments, the metal connection structure 213 includes a plurality of spaced first metal holes, one end of each first metal hole is electrically connected to the first metal layer 211, and the other end is electrically connected to the second metal layer 212.
[0042] In this embodiment of the application, the first metal hole can be understood as a hole with a metal conductive layer on the inner wall, which is electrically connected to the first metal layer 211 and the second metal layer 212 respectively.
[0043] Optionally, in some embodiments, the ratio of the distance between two adjacent first metal holes to the diameter of the first metal hole is less than or equal to 2, which allows the proportion of energy radiated from the distance between two adjacent first metal holes to be relatively small. Figure 1 As shown, three rows of first metal holes can be evenly spaced, thereby utilizing the tight sealing of the first metal holes to construct a metal resonant cavity. Since the metal holes can be directly realized through drilling and electroplating processes, its structure is simple and easy to manufacture.
[0044] Optionally, in some embodiments, the vertical projection of the gap 2121 on the target side is located within the vertical projection of the high dielectric material filling medium 22 on the target side.
[0045] In this embodiment of the application, the above-mentioned gap 2121 can be understood as a gap groove opened in the second metal layer 212. Other non-metallic media can also be filled in the gap 2121 to ensure the flatness of the surface of the second metal layer 212.
[0046] The vertical projection of the aforementioned slit 2121 onto the target side lies within the vertical projection of the high-dielectric material filling medium 22 onto the target side. This can be understood as the high-dielectric material filling medium 22 being positioned close to the slit 2121. Since the energy of the half-mode resonant cavity antenna element 21 is mainly radiated from the slit 2121, positioning the high-dielectric material filling medium 22 close to the slit 2121 can improve the effect of adjusting the radiation direction offset.
[0047] Optionally, in some embodiments, the half-mode resonant cavity antenna unit 21 further includes a second metal aperture 214 for impedance tuning, the second metal aperture 214 being electrically connected to the first metal layer 211 and the second metal layer 212, respectively.
[0048] In this embodiment, the standing wave ratio and bandwidth of the antenna can be optimized by adjusting the position of the second metal hole 214, thereby improving the radiation performance of the half-mode resonant cavity antenna element 21.
[0049] It should be understood that in other embodiments, other impedance matching circuits can also be used to achieve impedance tuning, and no further limitations are made here. Since impedance tuning is achieved using the second metal hole 214 in this embodiment, it can be achieved through drilling and electroplating processes, which is convenient for industrial production. At the same time, it can also avoid path loss caused by energy transmission in the impedance matching circuit.
[0050] Optionally, refer to Figures 4 to 5 In some embodiments, the number of the half-mode resonant cavity antenna elements 21 is two, and the openings of the two half-mode resonant cavity antenna elements 21 are both arranged facing the first side 202 or the second side 203 of the fixing band. The wearable device also includes an RF chip 30, a power divider 40 and a phase shifter 50. The RF chip 30 is electrically connected to the power divider 40, the power divider 40 is electrically connected to one of the half-mode resonant cavity antenna elements 21, and the power divider 40 is electrically connected to the other half-mode resonant cavity antenna element 21 through the phase shifter 50.
[0051] It should be understood that when the aforementioned half-mode resonant cavity antenna element 21 is a single unit, the resulting antenna structure is a linearly polarized antenna. Its polarization direction will change depending on the orientation of the wearable device. Multipath interference, multipath fading, and polarization mismatch during use will cause polarization loss, affecting the user experience. Therefore, in the embodiments of this application, two half-mode resonant cavity antenna elements 21 are further used to form a circularly polarized or elliptically polarized antenna structure.
[0052] Optionally, the power divider 40 and phase shifter 50 are electrically connected to the half-mode resonant cavity antenna element 21, which can be understood as the power divider 40 and phase shifter 50 being electrically connected to the feed point of the half-mode resonant cavity antenna element 21. It should be understood that... Figure 5 The circuit structure shown is only for illustrating the basic implementation principle of circular or elliptical polarization; therefore, the relevant matching circuit is not drawn, and it does not represent [the intended meaning]. Figure 5 The circuit diagram in the image is the actual schematic diagram.
[0053] Optionally, such as Figure 4 As shown, in some embodiments, the slot 2121 in one of the half-mode resonant cavity antenna elements 21 is arranged perpendicularly to the slot 2121 in the other half-mode resonant cavity antenna element 21.
[0054] For example, the slots 2121 in the two half-mode resonant cavity antenna elements 21 can be set to make an angle of 45° with the Y direction, and be orthogonal to each other. In this way, the electric field directions of the two slots 2121 are orthogonal, meaning the polarizations of the two half-mode resonant cavity antenna elements 21 are orthogonal. If the feed phases of the two half-mode resonant cavity antenna elements 21 are controlled to differ by 90°, a circularly polarized antenna structure can be formed, further improving radiation performance.
[0055] It should be noted that, in the embodiments of this application, a high dielectric material filling medium 22 can be provided for each half-mode resonant cavity antenna element 21, or a high dielectric material filling medium 22 can be provided simultaneously between the opening of two half-mode resonant cavity antenna elements 21 and the target side.
[0056] Furthermore, to simplify industrial production, the first metal layer 211 of the two half-mode resonant cavity antenna elements 21 can be integrally formed, the second metal layer 212 of the two half-mode resonant cavity antenna elements 21 can be integrally formed, and the metal connection structure 213 of the two half-mode resonant cavity antenna elements 21 is partially shared, such as... Figure 4 As shown, the metal connection structure 213 at the upper end of the lower half-mode resonant cavity antenna element 21 is shared with the metal connection structure 213 at the lower end of the upper half-mode resonant cavity antenna element 21.
[0057] Optionally, refer to Figure 6 and Figure 7In some embodiments, the number of half-mode resonant cavity antenna elements 21 is two, with one half-mode resonant cavity antenna element 21 having its opening facing the first side 202 of the fixing band 20, and the other half-mode resonant cavity antenna element 21 having its opening facing the second side 203 of the fixing band 20. The wearable device also includes an RF chip 30, a power divider 40, and a switching unit 60. The RF chip 30 is electrically connected to the power divider 40, and the power divider 40 is electrically connected to either of the two half-mode resonant cavity antenna elements 21 through the switching unit 60.
[0058] In this embodiment, the two half-mode resonant cavity antenna elements 21 are used to operate in different states. For example, when the user wears the wearable device with their left hand, the switching unit 60 can control one of the half-mode resonant cavity antenna elements 21 to operate; when the user wears the wearable device with their right hand, the switching unit 60 can switch to the other half-mode resonant cavity antenna element 21 to operate. In this way, regardless of whether the user is accustomed to wearing the wearable device with their right or left hand, the radiation performance can be improved.
[0059] It should be noted that the switching method for the operating states of the two half-mode resonant cavity antenna elements 21 can be set according to actual needs. For example, in some embodiments, the user can switch them manually.
[0060] In some embodiments, a gravity sensor can be provided to detect the user's wearing style, thereby controlling the switching unit 60 to switch to the corresponding half-mode resonant cavity antenna unit 21. This allows for simultaneous fulfillment of usage requirements under different wearing styles. In this embodiment, the gravity detection information output by the gravity sensor can be obtained by the aforementioned RF chip 30 or other control chip to determine the wearing state, and finally control the switching unit to connect the corresponding half-mode resonant cavity antenna unit 21 to the power divider 40.
[0061] Optionally, in the embodiments of this application, the above-mentioned switching unit may be a single-pole double-throw switch or two independent switches, without further limitation.
[0062] Furthermore, to simplify industrial production, the first metal layer 211 of the two half-mode resonant cavity antenna elements 21 can be integrally formed, the second metal layer 212 of the two half-mode resonant cavity antenna elements 21 can be integrally formed, and the metal connection structure 213 of the two half-mode resonant cavity antenna elements 21 is partially shared, such as... Figure 6 As shown, the metal connection structure 213 at the right end of the left half-mode resonant cavity antenna element 21 is shared with the metal connection structure 213 at the left end of the right half-mode resonant cavity antenna element 21.
[0063] Optionally, refer to Figures 8 to 9 In some embodiments, the number of the half-mode resonant cavity antenna elements 21 is four. The wearable device also includes an RF chip 30, a power divider 40, a phase shifter 50, and a switching unit 60. The RF chip 30 is electrically connected to the power divider 40. The power divider 40 is electrically connected to any one of the first half-mode resonant cavity antenna elements 21A and the second half-mode resonant cavity antenna elements 21B through the switching unit 60. The power divider 40 is also electrically connected to any one of the third half-mode resonant cavity antenna elements 21C and the fourth half-mode resonant cavity antenna elements 21D through the phase shifter 50 and the switching unit 60.
[0064] Wherein, the first half-mode resonant cavity antenna unit 21A and the third half-mode resonant cavity antenna unit 21C are two of the four half-mode resonant cavity antenna units, and the openings in the first half-mode resonant cavity antenna unit 21A and the third half-mode resonant cavity antenna unit 21C are arranged facing the first side 202 of the fixing strip; the second half-mode resonant cavity antenna unit 21B and the fourth half-mode resonant cavity antenna unit 21D are the other two of the four half-mode resonant cavity antenna units, and the openings in the second half-mode resonant cavity antenna unit 21B and the fourth half-mode resonant cavity antenna unit 21D are arranged facing the second side 203 of the fixing strip 20.
[0065] In this embodiment, the first half-mode resonant cavity antenna element 21A and the third half-mode resonant cavity antenna element 21C can operate simultaneously to form an elliptical or circularly polarized antenna 1. The second half-mode resonant cavity antenna element 21B and the fourth half-mode resonant cavity antenna element 21D can operate simultaneously to form an elliptical or circularly polarized antenna 2. Antenna 1 and antenna 2 are used to operate in different states. For example, when the user wears the wearable device with their left hand, the switching unit 60 can control the operation of the first half-mode resonant cavity antenna element 21A and the third half-mode resonant cavity antenna element 21C; when the user wears the wearable device with their right hand, the switching unit 60 can switch the operation of the second half-mode resonant cavity antenna element 21B and the fourth half-mode resonant cavity antenna element 21D. This improves radiation performance regardless of whether the user habitually wears the wearable device with their right or left hand.
[0066] Optionally, in the embodiments of this application, the above-mentioned switching unit may be a double-pole double-throw switch, or two independent switches may be used, without further limitation.
[0067] Furthermore, in some embodiments, the slots in the first half-mode resonant cavity antenna unit 21A and the slots in the third half-mode resonant cavity antenna unit 21C are arranged perpendicularly;
[0068] And / or, the slots in the second half-mode resonant cavity antenna unit 21B and the slots in the fourth half-mode resonant cavity antenna unit 21D are arranged perpendicularly.
[0069] In this embodiment, the first half-mode resonant cavity antenna element 21A and the third half-mode resonant cavity antenna element 21C can form a circularly polarized antenna, while the second half-mode resonant cavity antenna element 21B and the fourth half-mode resonant cavity antenna element 21D can also form a circularly polarized antenna. This can suppress multipath interference and multipath fading during electromagnetic wave transmission, reduce polarization loss caused by polarization mismatch, and improve the user experience.
[0070] It should be noted that the control method of the switching unit 60 can refer to the above embodiment. The difference from the above embodiment is that, in this embodiment, the switching unit 60 is used to control the four half-mode resonant cavity antenna elements 21 to be in any of the following states:
[0071] The first half-mode resonant cavity antenna element 21A is connected to the power divider 40, and the third half-mode resonant cavity antenna element 21C is connected to the phase shifter 50.
[0072] The second half-mode resonant cavity antenna element 21B is connected to the power divider 40, and the fourth half-mode resonant cavity antenna element 21D is connected to the phase shifter 50.
[0073] Optionally, in some embodiments, the wearable device is a watch, and the fixing strap 20 is a watch strap.
[0074] Optionally, the fixing strap 20 is a watch strap located at the bottom of the watch dial.
[0075] In this embodiment, the number of watch straps can be one or two. When there is only one watch strap, the half-mode resonant cavity antenna element 21 and the high-dielectric material filling medium 22 are disposed on the portion of the watch strap located at the bottom of the watch face. When there are two watch straps, the half-mode resonant cavity antenna element 21 and the high-dielectric material filling medium 22 are disposed on one of the watch straps at the bottom of the watch face. In the following embodiments, the example of having two watch straps will be described.
[0076] For example, in some embodiments, assuming that the dial has corresponding clock markings, such as markings at 3 o'clock, 6 o'clock, 9 o'clock, and 12 o'clock, the bottom of the dial of the watch can be understood as the end near the 6 o'clock marking.
[0077] Furthermore, to simplify industrial production, the first metal layer 211 of the four half-mode resonant cavity antenna elements 21 can be integrally formed, and the second metal layer 212 of the four half-mode resonant cavity antenna elements 21 can be integrally formed. In addition, the metal connection structure 213 of adjacent half-mode resonant cavity antenna elements 21 can be partially shared, specifically as follows: Figure 8 As shown.
[0078] Optionally, refer to Figure 10 In some embodiments, to better utilize the controls of the watchband, a resonant cavity antenna element 70 may also be provided on another watchband.
[0079] In this embodiment, the half-mode resonant cavity antenna unit 21 can be understood as half of the resonant cavity antenna unit 70. In other words, the difference between the resonant cavity antenna unit 70 and the half-mode resonant cavity antenna unit 21 is that the metal resonant cavity in the resonant cavity antenna unit 70 is surrounded by metal connection structures on all four sides.
[0080] Optionally, in some embodiments, the resonant cavity antenna element 70 can be configured as a dual-frequency antenna. For example, by setting the values of the length 'a' in the X direction and the length 'b' in the Y direction of the metal resonant cavity of the resonant cavity antenna element 70, the fundamental mode resonant frequency of the metal resonant cavity of the resonant cavity antenna element 70 is set at frequency f1, and the secondary mode is set at frequency f2. By opening two mutually orthogonal slots in the second metal layer of the resonant cavity antenna element 70, the electric fields at the two frequencies can be radiated from the two slots respectively, forming a dual-frequency antenna system. By optimizing the size and relative position of the two slots and the position of the tuning metal aperture (i.e., the second metal aperture), the reflection coefficient of the antenna can be optimized, so that the S-parameters of the antenna at frequencies f1 and f2 meet the design requirements.
[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0082] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A wearable device, characterized in that, include: The device body and the fixing strap are connected together. The fixing strap is provided with a half-mode resonant cavity antenna element and a high-dielectric material filling medium. The half-mode resonant cavity antenna unit includes a first metal layer, a second metal layer, and a metal connection structure. The distance from the first metal layer to the back of the fixing strip is less than the distance from the second metal layer to the back of the fixing strip. The metal connection structure is connected to the first metal layer and the second metal layer respectively. The first metal layer, the second metal layer, and the metal connection structure enclose a metal resonant cavity with an opening on one side. The opening of the metal resonant cavity faces the target side of the fixing strip. The second metal layer is provided with a slot for radiation. The high-dielectric material filling medium is disposed between the target side and the opening of the metal resonant cavity; Wherein, the target side is either a first side or a second side, and the first side and the second side are two opposite sides of the fixing strip along its length; the first metal layer is disposed on the back side of the fixing strip, and the second metal layer is disposed on the front side of the fixing strip; the metal connection structure is not disposed on the side of the metal resonant cavity facing the target side; The vertical projection of the gap on the side of the target lies within the vertical projection of the high-dielectric material filling medium on the side of the target.
2. The wearable device according to claim 1, characterized in that, The metal connection structure includes a plurality of spaced-apart first metal holes, one end of each first metal hole being electrically connected to a first metal layer and the other end being electrically connected to a second metal layer.
3. The wearable device according to claim 1, characterized in that, The half-mode resonant cavity antenna unit further includes a second metal aperture for impedance tuning, the second metal aperture being electrically connected to the first metal layer and the second metal layer, respectively.
4. The wearable device according to any one of claims 1 to 3, characterized in that, The number of the half-mode resonant cavity antenna elements is two, and the openings of the two half-mode resonant cavity antenna elements are both arranged facing the first side or the second side of the fixing band. The wearable device also includes an RF chip, a power divider and a phase shifter. The RF chip is electrically connected to the power divider, the power divider is electrically connected to one of the half-mode resonant cavity antenna elements, and the power divider is electrically connected to the other half-mode resonant cavity antenna element through the phase shifter.
5. The wearable device according to claim 4, characterized in that, The slot in one of the half-mode resonant cavity antenna elements is perpendicular to the slot in the other half-mode resonant cavity antenna element.
6. The wearable device according to any one of claims 1 to 3, characterized in that, The number of the half-mode resonant cavity antenna elements is two, and the opening of one half-mode resonant cavity antenna element is arranged facing the first side of the fixing band, and the opening of the other half-mode resonant cavity antenna element is arranged facing the second side of the fixing band. The wearable device also includes an RF chip, a power divider and a switching unit. The RF chip is electrically connected to the power divider, and the power divider is electrically connected to either of the two half-mode resonant cavity antenna elements through the switching unit.
7. The wearable device according to any one of claims 1 to 3, characterized in that, The number of the half-mode resonant cavity antenna elements is four. The wearable device also includes an RF chip, a power divider, a phase shifter, and a switching unit. The RF chip is electrically connected to the power divider. The power divider is electrically connected to any one of the first and second half-mode resonant cavity antenna elements through the switching unit. The power divider is also electrically connected to any one of the third and fourth half-mode resonant cavity antenna elements through the phase shifter and the switching unit. Wherein, the first half-mode resonant cavity antenna unit and the third half-mode resonant cavity antenna unit are two of the four half-mode resonant cavity antenna units, and the openings in the first half-mode resonant cavity antenna unit and the third half-mode resonant cavity antenna unit are arranged facing the first side of the fixed strip; the second half-mode resonant cavity antenna unit and the fourth half-mode resonant cavity antenna unit are the other two of the four half-mode resonant cavity antenna units, and the openings in the second half-mode resonant cavity antenna unit and the fourth half-mode resonant cavity antenna unit are arranged facing the second side of the fixed strip.
8. The wearable device according to claim 7, characterized in that, The slots in the first half-mode resonant cavity antenna unit and the slots in the third half-mode resonant cavity antenna unit are arranged perpendicularly; And / or, the slots in the second half-mode resonant cavity antenna unit and the slots in the fourth half-mode resonant cavity antenna unit are arranged perpendicularly.
9. The wearable device according to claim 1, characterized in that, The wearable device is a watch, and the fixing strap is a watch strap.