Electronic device

Abstract

The application discloses an electronic device, which comprises a frame body and a back cover, the back cover is provided with a metal decorative ring, the frame body comprises a first antenna, and the metal decorative ring is coupled with the first antenna; the metal decorative ring comprises a plurality of position points, the plurality of position points are arranged at intervals along the metal decorative ring, at least one position point in the plurality of position points is grounded, and a first position point in the plurality of position points is not grounded, and the first position point is the position point closest to the first antenna in the plurality of position points.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, specifically to an electronic device. Background Technology

[0002] The amount of electromagnetic waves absorbed by the human body is mainly measured by the specific absorption ratio (SAR). The smaller the SAR value, the less impact electromagnetic radiation has on the human body. Because electromagnetic radiation can have adverse effects on the human body, people have begun to pay attention to its impact. New national standards for SAR have imposed strict requirements on the SAR performance of electronic devices, posing challenges to antenna design. On the other hand, with the increasing demand for electronic devices, new requirements have been placed on their appearance and form factor. In recent years, with the increasingly mature development of intelligent electronic devices, the pursuit of thinner and lighter devices and ultra-high screen-to-body ratios has become an inevitable trend. However, this design significantly reduces the space available for antenna arrangement, leading to a deterioration of the antenna environment. Therefore, how to reduce the SAR peak value of antennas without adding extra space in electronic devices is an important issue worthy of research.

[0003] In related technologies, to achieve low SAR, the antenna aperture is often increased. This ensures that the antenna has high radiation efficiency while maintaining a low SAR peak value, but the antenna size is at least twice that of a traditional antenna. Therefore, in these technologies, achieving low SAR often leads to the problem of excessively large antenna size. Summary of the Invention

[0004] This application provides an electronic device that facilitates both low SAR and miniaturization of the antenna.

[0005] In a first aspect, this application provides an electronic device, including: a frame and a back cover, wherein a metal decorative ring is provided on the back cover, the frame includes a first antenna, and the metal decorative ring is coupled to the first antenna;

[0006] The metal decorative ring includes multiple position points, which are arranged at intervals along the metal decorative ring. At least one of the multiple position points is grounded, and a first position point among the multiple position points is not grounded. The first position point is the position point closest to the first antenna among the multiple position points.

[0007] In this embodiment, by coupling the metal decorative ring to the first antenna and grounding at least one of the plurality of location points, the metal decorative ring can form a parasitic branch of the first antenna. Furthermore, by leaving the first location point ungrounded, a strong electric field is ensured at the first location point. Simultaneously, since the first location point is the closest to the first antenna among the plurality of location points, the electric field strength of the metal decorative ring is ensured to be close to the first antenna, resulting in a more sufficient coupling effect. Thus, by adjusting the resonant mode of the metal decorative ring, the SAR peak value of the first antenna can be reduced. Since the metal decorative ring of the electronic device can be reused to achieve SAR reduction of the first antenna, the SAR peak value of the first antenna can be reduced without increasing its size, which is beneficial for achieving low SAR while ensuring antenna miniaturization. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a slot antenna in related technologies;

[0009] Figure 2 yes Figure 1 A schematic diagram of the radiation efficiency of the slot antenna shown.

[0010] Figure 3 yes Figure 1 The resonant mode current distribution of the slot antenna in the embodiment;

[0011] Figure 4 yes Figure 1 The 5mm body SAR hotspot distribution map of the slot antenna common-mode and differential-mode in the embodiment;

[0012] Figure 5 This is a schematic diagram of the improved slot antenna.

[0013] Figure 6 yes Figure 5 The diagram shows the radiation efficiency of the improved slot antenna compared to the traditional slot antenna.

[0014] Figure 7 yes Figure 5 The SDM resonant mode current distribution of the improved slot antenna and the traditional slot antenna are shown.

[0015] Figure 8 yes Figure 5 The 5mm body SAR hotspot diagrams of the improved slot antenna SDM and the traditional slot antenna SCM are shown.

[0016] Figure 9 This is one of the structural schematic diagrams of an electronic device provided in the embodiments of this application;

[0017] Figure 10 yes Figure 9 A schematic diagram comparing the current distribution of the illustrated embodiment with the current distribution of an antenna without a decorative ring in the related art;

[0018] Figure 11 yes Figure 9 A schematic diagram comparing the current distribution of the illustrated embodiment with the radiation efficiency of the undecorated ring in related technologies;

[0019] Figure 12 yes Figure 9 A schematic diagram comparing the current distribution of the illustrated embodiment with the SAR hotspot distribution without decorative rings in related technologies;

[0020] Figure 13 This is an exploded view of the structure of an electronic device provided in an embodiment of this application;

[0021] Figure 14 These are schematic diagrams of the structure of an electronic device provided in the embodiments of this application, namely, diagrams two to four.

[0022] Figure 15 yes Figure 14 (a) A schematic diagram comparing the current distribution of the embodiment shown with the current distribution of an antenna without a decorative ring in the related art;

[0023] Figure 16 yes Figure 14 (a) is a schematic diagram comparing the current distribution of the embodiment shown with the radiation efficiency of the related art without a decorative ring.

[0024] Figure 17 yes Figure 14 (a) is a schematic diagram comparing the current distribution of the embodiment shown in the figure with the SAR hotspot distribution without decorative rings in the related art.

[0025] Figure 18 yes Figure 14 (b) Schematic diagram of current distribution in the embodiment shown;

[0026] Figure 19 This is the fifth schematic diagram of the structure of an electronic device provided in the embodiments of this application;

[0027] Figure 20 yes Figure 19 A schematic diagram of the current distribution in the embodiment shown;

[0028] Figure 21 yes Figure 19 A schematic diagram comparing the current distribution of the illustrated embodiment with the SAR hotspot distribution without decorative rings in related technologies;

[0029] Figure 22 This is the sixth schematic diagram of the structure of an electronic device provided in the embodiments of this application;

[0030] Figure 23 This is the seventh schematic diagram of the structure of an electronic device provided in the embodiments of this application;

[0031] Figure 24 This is the eighth schematic diagram of the structure of an electronic device provided in the embodiments of this application;

[0032] Figure 25 This is the ninth schematic diagram of the structure of an electronic device provided in the embodiments of this application;

[0033] Figure 26 This is the tenth schematic diagram of the structure of an electronic device provided in the embodiments of this application;

[0034] Figure 27 This is eleventh of the structural schematic diagrams of an electronic device provided in the embodiments of this application;

[0035] Figure 28 This is a schematic diagram of the various structures of the decorative rings in the embodiments of this application. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0037] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one 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.

[0038] The following description, in conjunction with the accompanying drawings, details an electronic device provided in this application through specific embodiments and application scenarios.

[0039] Please see Figure 9 and Figure 13 , Figure 9 and Figure 13An electronic device provided in this application embodiment includes: a frame 100 and a back cover 200, the back cover 200 is provided with a metal decorative ring 300, the frame 100 includes a first antenna 110, and the metal decorative ring 300 is coupled to the first antenna 110;

[0040] The metal decorative ring 300 includes multiple position points, which are arranged at intervals along the metal decorative ring 300. At least one of the multiple position points is grounded, and the first position point 310 among the multiple position points is not grounded. The first position point 310 is the position point closest to the first antenna 110 among the multiple position points.

[0041] The first antenna 110 can be any antenna that can be fabricated in the frame 100 of an electronic device. For example, the first antenna 110 can be any inverted-F antenna (IFA), T antenna, slot antenna, etc.

[0042] The aforementioned frame 100 can be the mid-frame of an electronic device. Specifically, the frame 100 can be a metal frame 100, and various openings can be made in the frame 100 to form different antennas.

[0043] The aforementioned back cover 200 is the back cover of the electronic device, and the metal decorative ring 300 can serve as a camera decorative ring. The shape of the metal decorative ring 300 can be customized as needed; for example, please refer to [reference needed]. Figure 28 In some embodiments of this application, the metal decorative ring 300 may be Figure 28 (a)- Figure 28 Any shape from (h). Furthermore, the size of the metal decorative ring 300 can be set according to requirements; for example, the metal decorative ring 300 can be adapted to the shape and size of the rear camera.

[0044] To further explain the inventive concept of this application, the following structural drawings provide further explanation of the design principles of this application:

[0045] Please see Figure 1 This is one example of a traditional slot antenna structure operating in the mid-to-high frequency band (1.7GHz-2.7GHz) in related technologies. The antenna is positioned at the top of one quadrant of a terminal electronic device (such as a mobile phone). The main stub size is denoted as L1, and the parasitic stub size is denoted as L2. Generally, L1 > L2. The mode analysis of a traditional slot antenna is as follows: Figure 2 and Figure 3As shown, within the operating frequency band, the slot antenna mainly exhibits two resonant modes. The lower-frequency resonant mode is the common-mode (SCM) mode, which shows a convex hull in terms of radiation efficiency, and the mode current distribution is a current vector in the same direction, as shown below. Figure 3 (a) The resonant mode with a higher frequency is the slot differential mode (SDM), which exhibits a pit in radiation efficiency and a current distribution that is a reverse current vector, such as... Figure 3 (b). Among them. Figure 3 (a) is a schematic diagram of the current distribution in common-mode. Figure 3 (b) is a schematic diagram of the current distribution in differential mode.

[0046] The two resonant modes of the slot antenna exhibit completely different performance on 5mm-body SAR. SCM, due to its unidirectional current vector distribution and more concentrated hotspots, shows relatively higher SAR performance. Figure 4 (a); SDM has a relatively low SAR because the mode current distribution is a reverse current vector and the hotspot distribution is more dispersed, such as Figure 4 (b). Among them. Figure 4 (a) is a schematic diagram of the hotspot distribution in the common-mode pattern. Figure 4 (b) is a schematic diagram of the hotspot distribution in the differential mode.

[0047] It is evident that if the reverse current of parasitic stubs can be excited, such as with SDM, the SAR hotspot distribution will be more dispersed and the SAR peak value will be lower. However, this is contradictory, as antenna efficiency often exhibits a dip. If SDM is to be used to cover a portion of the mid-to-high frequency band, a significant efficiency loss must be tolerated, which is not advisable in practical engineering applications.

[0048] Therefore, a feasible way to reduce antenna SAR peak value while avoiding efficiency dips is to operate the antenna in unbalanced SDM. For example... Figure 5 As shown, the antenna structure is based on the traditional slot antenna structure, with a grounding capacitor of C = 1.5 pF connected in series at the end of the parasitic stub. The antenna's radiation efficiency is as follows. Figure 6 As shown, the efficiency dip is precisely adjusted to be lower than the entire mid-to-high frequency band, around 1.34 GHz. At this point, the antenna has a high radiation efficiency across the entire mid-to-high frequency band, and it is comparable to the common-mode radiation efficiency of traditional schemes. However, this resonant mode still has SDM components in its mode composition. Figure 7As shown, the improved slot antenna has a 1.5pF ground capacitance at the end of the parasitic stub, and this 1.5pF capacitor also partially conducts at mid-to-high frequencies. Therefore, the current vector distribution is stronger on the main stub and slightly weaker on the parasitic stub. Thus, compared to the SCM of a traditional slot antenna, the unbalanced SDM still excites some reverse current in the parasitic stub, but the strength of the current distribution in the parasitic stub is controlled. Figure 8 The image shows a comparison of 5mm-body SAR hotspot distributions for two modes with comparable efficiency: an improved slot antenna unbalanced SDM and a traditional slot antenna SCM. It is evident that the improved slot antenna unbalanced SDM exhibits a significantly larger SAR hotspot distribution area. Therefore, compared to the traditional slot antenna SCM, the improved slot antenna unbalanced SDM design achieves comparable radiation efficiency but with a more dispersed SAR hotspot distribution, demonstrating a clear advantage. Figure 7 (a) is a schematic diagram of the current distribution in the common-mode mode of a traditional slot antenna scheme. Figure 7 (b) is a schematic diagram of the current distribution in the differential mode of the improved slot antenna scheme. Figure 8 (a) is a schematic diagram of the hotspot distribution in the common-mode mode of a traditional slot antenna scheme. Figure 8 (b) is a schematic diagram of the hotspot distribution in the differential mode of the improved slot antenna scheme.

[0049] Additionally, it should be noted that, considering the conductivity of capacitors for mid-to-high frequency signals, the series-connected grounding capacitor C can be selected within the range of 1.0pF to 2.0pF. Simultaneously, the size L2 of the parasitic stub needs to be adjusted accordingly for different capacitor values ​​to ensure the efficiency dip is just below the overall mid-to-high frequency range (e.g., the deepest point of the radiation efficiency dip is designed within the frequency range of 1.2GHz to 1.4GHz), ensuring a certain degree of reverse current distribution in the parasitic stub. The above design method is only an example of a mid-to-high frequency slot antenna; this design method can also be applied to antenna designs in higher or lower frequency bands.

[0050] The above design principle demonstrates that, within a mid-frame environment, designing the antenna to operate in a slot antenna differential mode with unbalanced current distribution can achieve both high radiation efficiency and a more dispersed SAR hotspot distribution. This involves two key factors:

[0051] (1) There is a good coupling relationship between the parasitic branches and the main radiating branches, such as the mouth-to-mouth 1 / 4 branches;

[0052] (2) The parasitic branch and the main radiating branch have good coupling strength. For example, there are requirements for the resonant frequency of the parasitic branch, which should be lower than and close to the working frequency of the main radiating branch.

[0053] Therefore, in a compact frame environment, there are two ways to design the antenna operating mode in the differential mode of a slot antenna with unbalanced current distribution:

[0054] (1) Design a suitable parasitic structure for the antenna separately. This approach will result in the antenna occupying a large amount of mid-frame space.

[0055] (2) Reuse the structure of surrounding adjacent antennas, making the radiators of adjacent antennas parasitic structures of the main radiating antenna, for example, for Figure 5 The structure shown places the antenna operating in the L5 band (1176.45MHz) at the opposite position of the mid-to-high frequency antenna, making it a parasitic structure of the mid-to-high frequency antenna. This approach has some merit, but it imposes limitations on the overall layout of the device.

[0056] Based on the problems arising from the two implementation methods mentioned above, a better approach to reduce antenna SAR peak values ​​is to design the parasitic structure of the main radiating antenna on the decorative ring. This involves coupling the antenna with the metal camera decorative ring of the electronic device, causing the metal camera decorative ring to operate in a 1 / 4 wavelength resonant mode at a frequency lower than the mid-to-high frequency band. In other words, the slot structure formed by the main radiating element and the metal decorative ring 300 is designed in an unbalanced slot antenna differential mode. Compared to the implementation method located in the mid-frame, this approach not only effectively reduces the SAR peak value of the electronic device but also reduces the space occupied by the antenna on the mid-frame, meaning it doesn't add extra space, making it a better implementation strategy.

[0057] All of the aforementioned locations can serve as tuning points for the metal decorative ring 300. By ensuring that the first location point 310 is not grounded (i.e., in an ungrounded (NC) state), a strong electric field is ensured at the first location point 310. Furthermore, since the first location point 310 is the closest to the first antenna 110 among the multiple locations, the electric field strength of the metal decorative ring 300 is ensured to be close to the first antenna 110, resulting in a more efficient coupling effect. Additionally, by grounding at least one of the multiple locations, it is ensured that the metal decorative ring 300 can form a parasitic branch of the first antenna 110.

[0058] Furthermore, to ensure that the electric field strength point of the first antenna 110 is close to the metal decorative ring 300, please refer to... Figure 9 Alternatively, the end of the first antenna 110 closest to the metal decorative ring 300 can be ungrounded, while the other end of the first antenna 110 is grounded. Since the ungrounded end of the first antenna 110 forms the electric field strength point of the first antenna 110, it is beneficial to make the electric field strength point of the metal decorative ring 300 close to the electric field strength point of the first antenna 110, so that the two can generate a more sufficient coupling effect.

[0059] Please see Figure 13In this embodiment, the electronic device also includes other general-purpose components such as a motherboard 400 and a display module 500. The back cover 200, motherboard 400, frame 100, and display module 500 are stacked sequentially and fixedly connected. A feed 120 may be provided in the motherboard 400, and the feed 120 is electrically connected to the first antenna 110.

[0060] In this embodiment, by coupling the metal decorative ring 300 to the first antenna 110 and grounding at least one of the plurality of location points, the metal decorative ring 300 can form a parasitic branch of the first antenna 110. Furthermore, by leaving the first location point 310 ungrounded, a strong electric field strength is ensured at the first location point 310. Simultaneously, since the first location point 310 is the closest to the first antenna 110 among the plurality of location points, the electric field strength point of the metal decorative ring 300 is ensured to be close to the first antenna 110, resulting in a more sufficient coupling effect. Thus, by adjusting the resonant mode of the metal decorative ring 300, the SAR peak value of the first antenna 110 can be reduced. Since the metal decorative ring 300 of the electronic device can be reused to achieve SAR reduction of the first antenna 110, the SAR peak value of the first antenna 110 can be reduced without increasing the size of the first antenna 110, which is beneficial for achieving low SAR while ensuring antenna miniaturization.

[0061] Optionally, please see Figure 9 In some embodiments of this application, the plurality of position points further include a second position point 320, a third position point 330, and a fourth position point 340. The first position point 310, the second position point 320, the third position point 330, and the fourth position point 340 are arranged at equal intervals along the metal decorative ring 300. The second position point 320, the third position point 330, and the fourth position point 340 are respectively grounded.

[0062] In this embodiment, by leaving the first position point 310 unconnected and grounding the second position point 320, the third position point 330, and the fourth position point 340 respectively, when the metal decorative ring 300 generates a 1 / 4 wavelength resonance, a strong electric field point is formed at the first position point 310, strong current points are formed at the second and fourth position points 320 and 340, and a secondary strong current point is formed at the third position point 330. Since the electric field strength region of the resonant mode of the metal decorative ring 300 is close to the electric field strength region of the resonant mode of the antenna body, good coupling can be achieved, and the 1 / 4 wavelength resonant mode of the metal decorative ring 300 is sufficiently excited.

[0063] Optionally, when the first antenna 110 is in operation, the resonant mode of the metal decorative ring 300 is a 1 / 4 wavelength resonant mode.

[0064] Specifically, the 1 / 4 wavelength in the 1 / 4 wavelength resonant mode refers to 1 / 4 of the operating wavelength of the first antenna 110.

[0065] In some embodiments of this application, the size of the metal decorative ring 300 can be adjusted so that, when the first antenna 110 is in operation, the resonant mode of the metal decorative ring 300 is a 1 / 4 wavelength resonant mode. In other embodiments of this application, a tuning circuit can also be connected in series at the first position point 310 to adjust the resonant mode of the metal decorative ring 300 to a 1 / 4 wavelength resonant mode.

[0066] Please see Figure 10 ,yes Figure 9 The illustrated embodiment is a schematic diagram comparing the current distribution of an antenna without a decorative ring in related technologies. Figure 10 (a) is Figure 9 The current distribution diagram of the embodiment shown is as follows: Figure 10 (b) A comparative schematic diagram of antenna current distribution without decorative rings in related technologies. (Using...) Figure 9 The embodiment shown has at least the following beneficial effects: the 5mm-body-SAR hotspots on the back of the antenna are dispersed, and the SAR peak value is significantly reduced, as shown in Table 1, where Table 1 is a comparison of normalized SAR peak values.

[0067] Table 1: Figure 9 Comparison of current distribution in the illustrated embodiment with normalized SAR peak value without decorative ring in related technologies

[0068]

[0069]

[0070] The introduced metal decorative ring does not affect the antenna's radiation efficiency at 300° resonance, resulting in high antenna efficiency.

[0071] Utilizing the existing metal structure design of electronic devices, no additional space is required.

[0072] Please see Figure 10 The current distribution in this embodiment matches the intended design, indicating that the metal decorative ring 300 operates in a quarter-wavelength resonant mode. Regarding radiation efficiency, as... Figure 11As shown, introducing a 1 / 4 wavelength metal decorative resonance will result in an efficiency dip at a frequency outside the mid-high frequency band, around 1.4 GHz. This is due to the current distribution on the decorative ring being opposite to the current distribution on the antenna body. The efficiency dip has a low impact on the radiation efficiency within the antenna's operating frequency band. Figure 12 The image shows the 5mm-body-SAR hotspot distribution on the back of an electronic device equipped with a quarter-wavelength resonant large metal decorative ring 300. It can be seen that when the resonant frequency of the metal decorative ring 300 is close to the antenna's operating frequency, it has a significant pulling effect on the hotspots, resulting in a more dispersed hotspot distribution compared to when there is no metal decorative ring 300.

[0073] In this embodiment, since the resonant mode of the metal decorative ring 300 is a 1 / 4 wavelength resonant mode when the first antenna 110 is in the working state, it is beneficial to make the unbalanced slot antenna differential mode formed by the main radiator of the first antenna 110 and the metal decorative ring 300 effective in reducing the SAR peak of the electronic device. At the same time, it can also reduce the space occupied by the antenna on the mid-frame.

[0074] Optionally, please see Figure 19 The plurality of position points also include a second position point 320, a third position point 330 and a fourth position point 340. The first position point 310, the second position point 320, the third position point 330 and the fourth position point 340 are arranged at equal intervals along the metal decorative ring 300. The second position point 320 and the fourth position point 340 are grounded respectively, and the third position point 330 is not grounded.

[0075] The third position point 330 is not grounded, that is, the third position point 330 is in an ungrounded state.

[0076] In this embodiment, since both the first position point 310 and the third position point 330 are in an unloaded state, it is beneficial to excite more resonant modes in the metal decorative ring 300, thereby achieving the adjustment of the resonant modes of the metal decorative ring 300.

[0077] Optionally, when the first antenna 110 is in operation, the resonant mode of the metal decorative ring 300 is a mixed mode of 1 / 4 wavelength resonant mode and 1 / 2 wavelength resonant mode.

[0078] In some embodiments of this application, the size of the metal decorative ring 300 can be adjusted to achieve a mixed resonant mode of 1 / 4 wavelength resonant mode and 1 / 2 wavelength resonant mode when the first antenna 110 is in operation. In other embodiments of this application, the resonant mode of the metal decorative ring 300 can also be adjusted to a 1 / 4 wavelength resonant mode by connecting a tuning circuit in series at a first position point 310 and at a third position point 330.

[0079] Please see Figure 20 In order to Figure 19 The simulation results of the metal decorative ring 300 at a mid-frequency of 1.75 GHz, obtained from the illustrated embodiment, show that under this design, the metal decorative ring 300 operates in a mixed mode of 1 / 4 wavelength and 1 / 2 wavelength. This embodiment is relative to... Figure 9 In the embodiment shown, the current distribution on the metal decorative ring 300 is more uniform than that of a pure 1 / 4 wavelength resonance, and a better SAR hotspot dispersion effect will be obtained.

[0080] Figure 21 The image shows the SAR hotspot distribution on the back side of the antenna (5mm-body) when the decorative ring is operating in a mixed 1 / 4 wavelength and 1 / 2 wavelength mode. It can be seen that compared to the SAR hotspot distribution without the decorative ring, the SAR hotspot distribution is significantly more dispersed after introducing the 300° resonant mode component of the metal decorative ring. Figure 21 (a) is for Figure 19 The diagram shows a simulated SAR hotspot distribution from the illustrated embodiment. Figure 21 (b) is a schematic diagram of SAR hotspot distribution without decorative rings in related technologies.

[0081] Table 2: [Table 2: ...] Figure 19 The normalized SAR peak value comparison obtained from the simulation in the embodiment is described.

[0082]

[0083] In this embodiment, the 5mm-body SAR hotspots on the back of the first antenna 110 are more dispersed, and the SAR peak value is further reduced. Table 2 shows the results for... Figure 19 The normalized SAR peak values ​​obtained from simulations in the described embodiments are compared. Furthermore, the introduced decorative ring resonance does not affect the antenna's radiation efficiency, resulting in high antenna efficiency; and by utilizing the existing metal structure design of the electronic device, no additional space is required.

[0084] Optionally, the distance between the first position point 310 and the second position point 320 along the length direction of the metal decorative ring 300 is one-quarter of the operating wavelength of the first antenna 110.

[0085] Specifically, the distance between the first position point 310 and the second position point 320 along the length of the metal decorative ring 300 being one-quarter of the operating wavelength of the first antenna 110 means that the length of the metal decorative ring 300 between the first position point 310 and the second position point 320 is one-quarter of the operating wavelength of the first antenna 110. For example, please refer to... Figure 19 When the metal decorative ring 300 is annular, the arc length between the first position point 310 and the second position point 320 is one-quarter of the operating wavelength of the first antenna 110. For another example, please refer to... Figure 22 When the metal decorative ring 300 is a rectangular ring, the length of the side formed by the first position point 310 and the second position point 320 is one-quarter of the operating wavelength of the first antenna 110.

[0086] In this embodiment, by making the distance between the first position point 310 and the second position point 320 along the length direction of the metal decorative ring 300 one-quarter of the operating wavelength of the first antenna 110, the metal decorative ring 300 can be excited to a 1 / 4 wavelength resonant mode without being connected to other tuning circuits.

[0087] Optionally, please see Figure 14 (b) In some embodiments of this application, the plurality of position points further include a second position point 320, a third position point 330, and a fourth position point 340. The first position point 310, the second position point 320, the third position point 330, and the fourth position point 340 are arranged at equal intervals along the metal decorative ring 300. The second position point 320 is grounded, the third position point 330 is not grounded, and the fourth position point 340 is not grounded; or...

[0088] Please see Figure 14 (c) In other embodiments of this application, the plurality of position points further include a second position point 320, a third position point 330, and a fourth position point 340. The first position point 310, the second position point 320, the third position point 330, and the fourth position point 340 are arranged at equal intervals along the metal decorative ring 300. The second position point 320 is not grounded, the third position point 330 is grounded, and the fourth position point 340 is not grounded; or...

[0089] Please see Figure 14(a) In some other embodiments of this application, the plurality of position points further include a second position point 320, a third position point 330 and a fourth position point 340. The first position point 310, the second position point 320, the third position point 330 and the fourth position point 340 are arranged at equal intervals along the metal decorative ring 300. The second position point 320 and the third position point 330 are grounded, and the fourth position point 340 is not grounded.

[0090] It should be noted that, in the embodiments of this application, the tuning point position of the metal decorative ring 300 is not limited to the first position point 310, the second position point 320, the third position point 330 and the fourth position point 340 mentioned above. There may be more grounding position schemes. The above embodiments are only illustrated with four position points, but the number of position points included in the metal decorative ring 300 is not limited to four.

[0091] In this embodiment, by adjusting the grounding state of each location point in the metal decorative ring 300, the versatility of the metal decorative ring 300 can be achieved while maintaining low SAR, so as to adapt to different application scenarios.

[0092] Optionally, the metal decorative ring 300 further includes a fifth position point 360, which is the midpoint between the first position point 310 and the fourth position point 340 along the length direction of the metal decorative ring 300, and the distance between the second position point 320 and the fifth position point 360 along the length direction of the metal decorative ring 300 is one-quarter of the operating wavelength of the first antenna 110.

[0093] When the first antenna 110 is in operation, the resonant mode of the metal decorative ring 300 is a 1 / 4 wavelength resonant mode.

[0094] For small metal decorative rings, the 300 Hz resonant mode can also be designed to be in a quarter-wavelength resonant mode. Figure 14 (a) Taking the embodiment shown as an example, the second position point 320 and the third position point 330 are grounded, while the first position point 310 and the fourth position point 340 are unconnected. With this design, the reverse current on the metal decorative ring 300 can be excited through the coupling between the antenna body of the first antenna 110 and the metal decorative ring 300. Figure 15 As shown, is Figure 14 (a) is a schematic diagram comparing the current distribution of the embodiment shown with the current distribution of an antenna without a decorative ring in the related art, and its antenna efficiency is as follows. Figure 16 As shown. Figure 17The diagram shows the 5mm-body SAR hotspot distribution on the back of the design with a metal decorative ring 300. It can be seen that the SAR hotspot distribution of the design with the small metal decorative ring 300 is significantly more dispersed compared to the design without the metal decorative ring 300.

[0095] It should be noted that, Figure 9 and Figure 19 This is for scenarios where the 300mm metal decorative ring is relatively large, and Figure 14 For scenarios where the metal decorative ring 300 is relatively small, when the metal decorative ring 300 is relatively small, by making the distance between the second position point 320 and the fifth position point 360 along the length direction of the metal decorative ring 300 one-quarter of the operating wavelength of the first antenna 110, it is beneficial to excite a 1 / 4 wavelength resonant mode in the metal decorative ring 300.

[0096] Please see Figure 18 In order to Figure 14 (b) shows the current distribution diagram obtained by simulation of the embodiment shown.

[0097] Table 3: Figure 14 (a) Comparison of current distribution in the embodiment shown with normalized SAR peak value without decorative ring in related technologies

[0098]

[0099] In this embodiment, the 5mm-body-SAR hotspots on the back of the first antenna 110 are more dispersed, and the SAR peak value is significantly reduced. Table 3 shows the results for... Figure 14 (a) Comparison of normalized SAR peak values ​​obtained from simulation. Furthermore, in this embodiment, the introduction of a 300° resonant metal decorative ring does not affect the antenna's radiation efficiency, resulting in high antenna efficiency; and by utilizing the existing metal structure design of the electronic device, no additional space is required.

[0100] Optionally, the electronic device further includes a tuning circuit, and the first position point 310 is electrically connected to the tuning circuit.

[0101] The tuning circuit may include various tuning circuits formed by electrical components such as capacitors or inductors. For example, in some embodiments of this application, the first position point 310 may be grounded through a small capacitor, or the first position point 310 may be grounded through a large inductor. The specific values ​​of the capacitor and inductor may be determined according to the actual scenario. For example, an optimal capacitor or inductor value may be determined through debugging.

[0102] In this embodiment, by further including a tuning circuit in the electronic device, and electrically connecting the first position point 310 to the tuning circuit, when the size of the metal decorative ring 300 cannot be adjusted, the resonant mode of the metal decorative ring 300 can be adjusted to a 1 / 4 wavelength resonant mode through the tuning circuit.

[0103] Optionally, the first antenna 110 is disposed at the first apex 130 of the frame 100, the metal decorative ring 300 is rectangular, and the metal decorative ring 300 includes a second apex 350 protruding toward the first apex 130, with the first position point 310 located at the second apex 350; or,

[0104] The first antenna 110 is disposed on the first side 140 of the frame 100, the metal decorative ring 300 is circular, and the first position point 310 is the position point of the metal decorative ring 300 that is closest to the first side 140.

[0105] Please see Figure 22 In some embodiments of this application, when the first antenna 110 is disposed at the first apex 130 of the frame 100, by setting the metal decorative ring 300 to be rectangular and including a second apex 350 protruding toward the first apex 130, and the first position point 310 being located at the second apex 350, it is beneficial to make the electric field strength point in the metal decoration more closely related to the electric field strength point in the first antenna 110, thereby improving the coupling effect between the metal decorative ring 300 and the first antenna 110.

[0106] Please see Figure 23 In other embodiments of this application, when the first antenna 110 is disposed on the first side 140 of the frame 100, the metal decorative ring 300 is set to be circular, and the first position point 310 is the position point in the metal decorative ring 300 closest to the first side 140. Thus, compared with the rectangular ring-shaped metal decorative ring 300, in this scenario, the use of the circular ring-shaped metal decorative ring 300 is more conducive to making the electric field strength point in the metal decoration closer to the electric field strength point in the first antenna 110, thereby improving the coupling effect between the metal decorative ring 300 and the first antenna 110.

[0107] It should be noted that the above embodiments are merely illustrative examples of the shape of the decorative ring and the first position point 310 in this application. In specific implementations, the shape of the metal decorative ring 300 and the position of the first position point 310 can be varied according to the position of the first antenna 110 to achieve a better coupling effect between the metal decorative ring and the first antenna 110. For example, please refer to... Figures 24-27 .

[0108] In this embodiment, the shape of the metal decorative ring 300 and the position of the first position point 310 can be changed to adapt the shape of the metal decorative ring 300 and the position of the first position point 310 to the position of the first antenna 110 in the frame 100, thereby improving the coupling effect between the metal decorative ring 300 and the first antenna 110.

[0109] It should be noted that the magnitude of the SAR peak value is closely related to the conducted power of the RF front-end and the antenna's own radiation efficiency (the actual radiated electromagnetic energy). To effectively compare SAR performance, the conducted power of the RF front-end and the antenna's own radiation efficiency need to be normalized to the same level before comparing the SAR peak values. Therefore, the above embodiment introduces the concept of normalized SAR. Currently, the industry standard for normalization is typically defined as RF conducted power 24 dBm and antenna efficiency -5 dB.

[0110] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An electronic device, characterized in that, include: The frame and the back cover, the back cover being provided with a metal decorative ring, the frame including a first antenna, the metal decorative ring being coupled to the first antenna; The metal decorative ring includes multiple position points, which are arranged at intervals along the metal decorative ring. At least one of the multiple position points is grounded, and a first position point among the multiple position points is not grounded. The first position point is the position point closest to the first antenna among the multiple position points.

2. The electronic device according to claim 1, characterized in that, The plurality of position points also includes a second position point, a third position point, and a fourth position point. The first position point, the second position point, the third position point, and the fourth position point are arranged at equal intervals along the metal decorative ring. The second position point, the third position point, and the fourth position point are respectively grounded.

3. The electronic device according to claim 2, characterized in that, When the first antenna is in operation, the resonant mode of the metal decorative ring is a 1 / 4 wavelength resonant mode.

4. The electronic device according to claim 1, characterized in that, The plurality of position points also includes a second position point, a third position point, and a fourth position point. The first position point, the second position point, the third position point, and the fourth position point are arranged at equal intervals along the metal decorative ring. The second position point and the fourth position point are grounded, while the third position point is not grounded.

5. The electronic device according to claim 1, characterized in that, When the first antenna is in operation, the resonant mode of the metal decorative ring is a hybrid mode of 1 / 4 wavelength resonant mode and 1 / 2 wavelength resonant mode.

6. The electronic device according to any one of claims 2 or 4, characterized in that, The distance between the first position point and the second position point along the length of the metal decorative ring is one-quarter of the operating wavelength of the first antenna.

7. The electronic device according to claim 1, characterized in that, The plurality of position points further includes a second position point, a third position point, and a fourth position point. The first position point, the second position point, the third position point, and the fourth position point are arranged at equal intervals along the metal decorative ring. The second position point is grounded, the third position point is not grounded, and the fourth position point is not grounded; or, The plurality of position points further includes a second position point, a third position point, and a fourth position point. The first position point, the second position point, the third position point, and the fourth position point are arranged at equal intervals along the metal decorative ring. The second position point is not grounded, the third position point is grounded, and the fourth position point is not grounded; or, The plurality of position points also includes a second position point, a third position point, and a fourth position point. The first position point, the second position point, the third position point, and the fourth position point are arranged at equal intervals along the metal decorative ring. The second position point and the third position point are grounded, while the fourth position point is not grounded.

8. The electronic device according to claim 7, characterized in that, The metal decorative ring also includes a fifth position point, which is the midpoint between the first position point and the fourth position point along the length direction of the metal decorative ring, and the distance between the second position point and the fifth position point along the length direction of the metal decorative ring is one-quarter of the operating wavelength of the first antenna. When the first antenna is in operation, the resonant mode of the metal decorative ring is a 1 / 4 wavelength resonant mode.

9. The electronic device according to claim 1, 2, 4, or 7, characterized in that, The electronic device further includes a tuning circuit, and the first position point is electrically connected to the tuning circuit.

10. The electronic device according to claim 1, characterized in that, The first antenna is located at the first apex corner of the frame. The metal decorative ring is rectangular and includes a second apex protruding towards the first apex corner. The first position point is located at the second apex corner. Alternatively... The first antenna is disposed on the first side of the frame, the metal decorative ring is circular, and the first position point is the position point of the metal decorative ring that is closest to the first side.

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