Antenna structure and electronic equipment

Abstract

This disclosure relates to an antenna structure and electronic device. The antenna structure includes: a radiator, comprising a first upper frame point, a free end, a first ground end, and a second ground end, the first ground end being directly grounded; the free end and the first ground end are respectively located at both ends of the radiator, the free end forming an antenna gap, the first upper frame point being located between the first ground end and the second ground end; a grounding element, the second ground end being inductively grounded through the grounding element; and a feed point electrically connected to the first upper frame point, the feed point exciting the stubs between the free end and the first upper frame point to form a first antenna, and the feed point exciting the stubs between the first ground end and the second ground end to form a second antenna, the first antenna and the second antenna not forming an efficiency pit. Thus, without reducing the resonant frequency of the antenna, the length of the radiator is increased, which can disperse the current hotspots of the antenna, reduce the current strong points, reduce the electromagnetic energy absorbed by biological tissue, and improve the performance of the antenna.

Description

Technical Field

[0001] This disclosure relates to the field of terminal technology, and in particular to an antenna structure and electronic device. Background Technology

[0002] With the rapid development of wireless communication technology, terminal devices have become necessities in our daily lives. Wireless terminal devices contain one or more antennas used to radiate or receive electromagnetic energy. The antennas of terminal devices are usually very close to the user's head and body. Prolonged use of terminal devices by users can lead to serious electromagnetic radiation exposure. Utility Model Content

[0003] This disclosure provides antenna structures and electronic devices to at least address some of the technical problems in the background art.

[0004] This disclosure provides an antenna structure, including:

[0005] The radiator includes a first upper frame point, a free end, a first grounding end, and a second grounding end, wherein the first grounding end is directly grounded; the free end and the first grounding end are respectively located at both ends of the radiator, the free end is used to form an antenna gap, and the first upper frame point is located between the first grounding end and the second grounding end.

[0006] A grounding component, one end of which is grounded and the other end is electrically connected to a second grounding terminal, wherein the second grounding terminal is inductively grounded through the grounding component;

[0007] A feed point is electrically connected to the first upper frame point. The feed point excites the stub between the free end and the first upper frame point to form a first antenna, and the feed point excites the stub between the first ground end and the second ground end to form a second antenna. The resonant frequency of the first antenna in a first resonant mode and the resonant frequency of the second antenna in a second resonant mode are compatible, so that the first antenna and the second antenna do not form an efficiency pit. The first resonant mode and the second resonant mode may be the same or different.

[0008] The antenna structure provided in this disclosure includes a radiator comprising a first upper frame point and a free end, a feed point connected to the first upper frame point, and the feed point exciting the stub between the free end and the first upper frame point to form a first antenna.

[0009] By comprising a first grounding terminal, a second grounding terminal, and a grounding element, the first grounding terminal is directly grounded, one end of the grounding element is grounded and the other end is electrically connected to the second grounding terminal, and the second grounding terminal is inductively grounded through the grounding element. Thus, the first grounding terminal is directly grounded, the second grounding terminal is inductively grounded, and the feed point is connected between the first and second grounding terminals. The feed point excites the branch between the first and second grounding terminals to form a second antenna.

[0010] By controlling the resonant frequency of the first antenna in the first resonant mode to be synchronized with the resonant frequency of the second antenna in the second resonant mode, efficiency dips are avoided between the first and second antennas. The first and second resonant modes may be the same or different. Thus, without reducing the antenna's resonant frequency, the length of the radiator is increased, which disperses the antenna's current hotspots, reducing current intensity points, decreasing the electromagnetic energy absorbed by biological tissue, and improving antenna performance.

[0011] In some possible implementations, the grounding element includes an inductor, a capacitor, or a metal component. Inductive grounding via an inductor, especially a centralized inductor, is low-cost but has high losses. When using a capacitor for inductive grounding, the capacitance needs to be relatively small to avoid direct grounding of the second grounding terminal. When grounding via a metal component, the metal component can be a metal block or a metal spring structure, forming a distributed inductance between the ground potential and the grounding terminal. This distributed inductance has low losses and a wide bandwidth. However, for metal block type distributed inductors, the metal block needs to be very thin to achieve the inductance return to ground, resulting in high cost and slightly higher manufacturing difficulty. Metal spring type distributed inductors are easy to implement but require spot welding at two points, leading to high costs.

[0012] In some possible implementations, the first resonant mode is an IFA (Inductively Coupled) resonant mode, and the stub length between the first top frame point and the free end is one-quarter of the wavelength of the first antenna. This configuration gives the IFA antenna a wide bandwidth, which is particularly beneficial in wireless communication and mobile devices, facilitating signal transmission across multiple frequency bands. Designing the stub length between the first top frame point and the free end to be one-quarter of the wavelength helps the first antenna operate at a specific resonant frequency. Furthermore, it allows for optimization of the antenna's input impedance, matching it to the feed line impedance, thereby reducing reflection loss and ensuring high signal transmission efficiency.

[0013] In some possible implementations, the second resonant mode is a loop resonant mode, where the stub length between the first and second ground terminals is half the wavelength of the second antenna. This configuration gives the loop antenna a relatively wide bandwidth, allowing it to support a wider frequency range and adapt to various communication protocols and signal transmission requirements. Loop antennas have a unique radiation pattern, typically omnidirectional, providing uniform radiation characteristics. This can disperse the current in the second antenna, reducing current intensity and SAR. By making the stub length between the first and second ground terminals half the wavelength of the second antenna, reflection loss can be effectively reduced, improving signal transmission efficiency.

[0014] In some possible implementations, the radiator further includes a second upper frame point, and the antenna structure includes a first switch. The second upper frame point is located between the free end and the first upper frame point, and is positioned closer to the free end relative to the first upper frame point. The first switch is electrically connected to the second upper frame point. Thus, by including a second upper frame point in the radiator and a first switch in the antenna structure, with the first switch electrically connected to the second upper frame point, and the first switch controlling the second upper frame point, dynamic tuning of the first antenna can be achieved. The first switch functions to switch circuits or change part of the structure of the first antenna, thereby changing the resonant frequency or impedance of the first antenna. Switching between different frequency bands is possible, allowing the antenna to adapt to different signal frequencies. For example, the addition of the second upper frame point changes the effective length of the first antenna, thereby adjusting its resonant frequency. Through switch control, good radiation performance can be provided in different frequency ranges. Alternatively, by controlling the first switch to change the input impedance of the first antenna, it can be better matched to the impedance of the feed line, thereby reducing signal reflection and improving the quality and efficiency of signal transmission.

[0015] By positioning the second upper frame point between the free end and the first upper frame point, and closer to the free end relative to the first upper frame point, the effective length and resonant frequency of the first antenna can be effectively adjusted.

[0016] In some possible implementations, the branch length between the second upper frame point and the free end is greater than or equal to 1 mm and less than or equal to 5 mm. This allows the second upper frame point to be positioned close to the free end while maintaining machining accuracy. Too small a size might affect the precision and operability of the machining process. Limiting the branch length between the second upper frame point and the free end to the range of 1 mm to 5 mm ensures high-quality manufacturing even with micron-level machining precision. This size range is achievable for most modern manufacturing processes, such as precision laser cutting, CNC machining, and miniaturized assembly, reducing errors and difficulties in the machining process.

[0017] In some possible implementations, the radiator further includes a third upper frame point, and the antenna structure includes a second switch. The third upper frame point is located between the first ground terminal and the second ground terminal; the second switch is electrically connected to the third upper frame point. Thus, by including a third upper frame point in the radiator and a second switch in the antenna structure, the second switch is electrically connected to the third upper frame point. The second switch controls the third upper frame point, enabling dynamic tuning of the second antenna. The second switch functions to switch circuits or change part of the second antenna's structure, thereby altering the second antenna's resonant frequency or impedance. Switching between different frequency bands is possible, allowing the second antenna to adapt to different signal frequencies. For example, the addition of the third upper frame point changes the effective length of the second antenna, thereby adjusting its resonant frequency. Through switch control, good radiation performance can be provided across different frequency ranges. Alternatively, by controlling the second switch to change the input impedance of the second antenna, it can be better matched to the impedance of the feed line, thereby reducing signal reflection and improving the quality and efficiency of signal transmission.

[0018] This disclosure also provides an electronic device, including an antenna structure.

[0019] In some possible implementations, the electronic device includes a metal frame, and the radiator is a portion of the metal frame. In this way, a portion of the metal frame of the electronic device can be used as the radiator without increasing the size of the electronic device.

[0020] In some possible implementations, the metal frame includes a first frame segment and a second frame segment. The first frame segment is the bottom of the metal frame, and the second frame segment is the side of the metal frame and is bent and connected relative to the first frame segment. The free end and the second grounding end are both located in the first frame segment, and the first grounding end and the first upper frame point are both located in the second frame segment. Thus, by making the first frame segment the bottom of the metal frame and the second frame segment the side of the metal frame and bent and connected relative to the first frame segment, the length of the radiator is increased, the current of the antenna structure is dispersed, thereby reducing SAR, without increasing the size of the electronic device. Furthermore, by dispersing the current of the antenna structure, the absorption of radiation from the antenna structure by the hand when using the handheld electronic device can also be reduced, thereby enhancing the radiation performance of the antenna. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an antenna structure according to an embodiment of the present disclosure;

[0022] Figure 2 for Figure 1 The graph showing the relationship between the reflection coefficient and frequency of the antenna structure is shown.

[0023] Figure 3 for Figure 1 The radiation efficiency curve of the antenna structure shown is presented.

[0024] Figure 4 for Figure 1 The diagram shows the current distribution of the first antenna in the antenna structure shown.

[0025] Figure 5 for Figure 1 The diagram shows the current distribution of the second antenna in the antenna mechanism shown.

[0026] Figure 6 This is a schematic diagram of an antenna structure according to another embodiment of the present disclosure;

[0027] Figure 7 for Figure 6 The graph showing the relationship between the reflection coefficient and frequency of the antenna structure is shown.

[0028] Figure 8 for Figure 6 The radiation efficiency curve of the antenna structure shown is presented.

[0029] Figure 9 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure.

[0030] Reference numerals: Antenna structure 1, Radiator 10, First upper frame point 11, Free end 12, First grounding end 13, Second grounding end 14, Grounding component 20, Feed point 30, Second upper frame point 15, First switch 40, Third upper frame point 16, Second switch 50, Electronic device 100, Metal frame 2, First frame segment 21, Second frame segment 22, Antenna slot 23, Speaker 24, SIM card slot 25, USB interface 26, Motor 27. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0032] Please refer to Figure 1 , Figure 1 This is a schematic diagram of an antenna structure 1 according to an embodiment of the present disclosure; the antenna structure 1 provided by the present disclosure includes:

[0033] The radiator 10 includes a first upper frame point 11, a free end 12, a first grounding end 13, and a second grounding end 14. The first grounding end 13 is directly grounded. The free end 12 and the first grounding end 13 are located at opposite ends of the radiator 10. The free end 12 forms an antenna gap to ensure that the radiated signal from the radiator 10 can be successfully radiated into the external space. The first grounding end 13 can be grounded via a circuit or connected to a metal ground plane via a metal rib. The first upper frame point 11 is located between the first grounding end 13 and the second grounding end 14.

[0034] Grounding element 20, one end of which is grounded and the other end is electrically connected to the second grounding terminal 14, which is inductively grounded through grounding element 20. In this way, the potentials of the first grounding terminal 13 and the second grounding terminal 14 are not always at the same potential, which facilitates the excitation of the stubs between the first grounding terminal 13 and the second grounding terminal 14 by the feed point 30 to form an antenna.

[0035] The power supply point 30 is electrically connected to the first upper frame point 11. The power supply point 30 and the first upper frame point 11 are electrically connected. Of course, other matching circuits or tuning circuits can be set on the connection circuit between the power supply point 30 and the first upper frame point 11. This disclosure does not limit this.

[0036] The feed point 30 excites the stub between the free end 12 and the first upper frame point 11 to form the first antenna, and the feed point 30 excites the stub between the first ground end 13 and the second ground end 14 to form the second antenna. The resonant frequency of the first antenna in the first resonant mode and the resonant frequency of the second antenna in the second resonant mode merge, so that the first antenna and the second antenna do not form an efficiency pit. The first resonant mode and the second resonant mode may be the same or different. Thus, the resonant frequency bands of the first antenna and the second antenna merge into one resonant frequency band, rather than being two separate resonant frequency bands. This is equivalent to the second antenna extending the bandwidth of the first antenna. The first resonant mode and the second resonant mode can be the same or different; this application does not impose any restrictions on this.

[0037] The antenna structure 1 provided in this embodiment includes a radiator 10 comprising a first upper frame point 11 and a free end 12, and a feed point 30 electrically connected to the first upper frame point 11. The feed point 30 excites the stub between the free end 12 and the first upper frame point 11 to form a first antenna.

[0038] By including a first grounding terminal 13, a second grounding terminal 14, and a grounding element 20 in the radiator 10, the first grounding terminal 13 is directly grounded, one end of the grounding element 20 is grounded, and the other end is electrically connected to the second grounding terminal 14. The second grounding terminal 14 is inductively grounded through the grounding element 20. Thus, the first grounding terminal 13 is directly grounded, the second grounding terminal 14 is inductively grounded, and the feed point 30 is electrically connected between the first grounding terminal 13 and the second grounding terminal 14. The feed point 30 excites the stubs between the first grounding terminal 13 and the second grounding terminal 14 to form a second antenna.

[0039] By controlling the resonant frequency of the first antenna in the first resonant mode to be synchronized with the resonant frequency of the second antenna in the second resonant mode, efficiency dips are avoided between the first and second antennas. Thus, without reducing the resonant frequency of antenna structure 1, the length of the radiator 10 is increased, which disperses the current hotspots in antenna structure 1, reducing current intensity points, lowering the electromagnetic energy SAR absorbed by biological tissue, and improving the performance of antenna structure 1.

[0040] In some possible implementations, the grounding element 20 includes an inductor, a capacitor, or a metal component. Inductive grounding can be achieved using an inductor, which can be a centralized inductor, offering low cost but incurring some losses. Inductive grounding can also be achieved using a capacitor, but the capacitance value needs to be relatively small to prevent the second grounding terminal 14 from being directly grounded. When grounding is achieved using a metal component, the metal component can be a metal block or a metal spring structure, forming a distributed inductance between the metal ground plane and the grounding terminal. This distributed inductance has low losses and a wide bandwidth. However, for metal block type distributed inductors, the metal block needs to be very thin to achieve the inductance return to ground, resulting in high cost and slightly higher manufacturing difficulty. For metal spring type distributed inductors, implementation is easier but requires spot welding at two points, leading to high cost. A suitable grounding element 20 can be selected based on the specific circumstances of the antenna structure 1 and the electronic device 100 to achieve inductive grounding of the second grounding terminal 14.

[0041] In some possible implementations, the first resonant mode is an IFA resonant mode, and the stub length between the first upper frame point 11 and the free end 12 is one-quarter of the wavelength of the first antenna. This configuration gives the IFA antenna a wide bandwidth, which is particularly beneficial in wireless communication and mobile devices, facilitating signal transmission across multiple frequency bands. By designing the stub length between the first upper frame point 11 and the free end 12 to be one-quarter of the wavelength of the first antenna, the first antenna can operate at a specific resonant frequency, and the input impedance of the first antenna can be optimized to match the impedance of the feed line, thereby reducing reflection loss and ensuring high efficiency in signal transmission.

[0042] In some possible implementations, the second resonant mode is a loop resonant mode, where the stub length between the first ground terminal 13 and the second ground terminal 14 is half the wavelength of the second antenna. This configuration gives the loop antenna a relatively wide bandwidth, allowing it to support a wider frequency range and adapt to various communication protocols and signal transmission requirements. The loop antenna has a unique radiation pattern, typically omnidirectional, providing uniform radiation characteristics, which can disperse the current in the second antenna, reducing current intensity and lowering SAR. By making the stub length between the first ground terminal 13 and the second ground terminal 14 half the wavelength of the second antenna, reflection loss can be effectively reduced, improving signal transmission efficiency.

[0043] Please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 The graph shown illustrates the relationship between the reflection coefficient and frequency of antenna structure 1. Figure 3 for Figure 1 The diagram shows the radiation efficiency curve of the antenna structure. Figure 2 As shown, referring to the horizontal coordinate value of the third marker, the first antenna generated a resonant frequency of 1.75 GHz. Referring to the horizontal coordinate value of the second marker, the second antenna generated a resonant frequency of 2 GHz, and the second marker did not change the direction of the curve extending upwards from the first marker, nor did it form a downward-dipping efficiency dip. Figure 3 As shown, Figure 3 The radiation efficiency curve of antenna structure 1 is shown. See [link / reference]. Figure 3 The abscissa values ​​of the first and second markers, within the range of 1.75 GHz to 2 GHz, indicate that this antenna structure 1 has good radiation efficiency.

[0044] Please refer to Figure 4 and Figure 5 , Figure 4 for Figure 1 A schematic diagram of the current distribution of the first antenna in antenna structure 1 shown; Figure 5 for Figure 1 The diagram shows the current distribution of the second antenna in antenna structure 1. Figure 4 and Figure 5 As shown, the current distribution range generated by the resonance of the first and second antennas is relatively large, and it is distributed around the entire radiator 10. In this way, the SAR value can be reduced, and the impact of the handheld electronic device 100 on the radiation performance of the antenna structure 1 can be reduced, thereby improving the radiation performance of the antenna structure 1.

[0045] Please refer to Figure 6 , Figure 6 This is a schematic diagram of an antenna structure according to another embodiment of this disclosure. Figure 6 As shown, the radiator 10 also includes a second upper frame point 15, and the antenna structure 1 includes a first switch 40. The second upper frame point 15 is located between the free end 12 and the first upper frame point 11, and is positioned closer to the free end 12 relative to the first upper frame point 11. The first switch 40 is electrically connected to the second upper frame point 15. Thus, by including the second upper frame point 15 in the radiator 10 and the first switch 40 in the antenna structure 1, and electrically connecting the first switch 40 to the second upper frame point 15, the first switch 40 controls the second upper frame point 15, enabling dynamic tuning of the first antenna. The function of the first switch 40 is to switch circuits or change part of the structure of the first antenna, thereby changing the resonant frequency or impedance of the first antenna. It can switch between different frequency bands, allowing the antenna to adapt to different signal frequencies. For example, the addition of the second upper frame point 15 changes the effective length of the first antenna, thereby adjusting its resonant frequency. Through the first switch 40, good radiation performance can be provided in different frequency ranges. Alternatively, by controlling the first switch 40 to change the input impedance of the first antenna, it can be better matched with the impedance of the feed line, thereby reducing signal reflection and improving the quality and efficiency of signal transmission.

[0046] By positioning the second upper frame point 15 between the free end 12 and the first upper frame point 11, and placing it closer to the free end 12 relative to the first upper frame point 11, the effective length and resonant frequency of the first antenna can be effectively adjusted.

[0047] In some possible implementations, the branch length between the second upper frame point 15 and the free end 12 is greater than or equal to 1 mm and less than or equal to 5 mm. This allows the second upper frame point 15 to be positioned close to the free end 12 while maintaining machining accuracy. Too small a size might affect the precision and operability of the machining process. Limiting the branch length between the second upper frame point 15 and the free end 12 to the range of 1 mm to 5 mm ensures high-quality manufacturing even with micron-level machining precision. This size range is achievable for most modern manufacturing processes, such as precision laser cutting, CNC machining, and miniaturized assembly, reducing errors and difficulties in the machining process.

[0048] like Figure 6As shown, the radiator 10 also includes a third upper frame point 16, and the antenna structure 1 includes a second switch 50. The third upper frame point 16 is located between the first ground terminal 13 and the second ground terminal 14; the second switch 50 is electrically connected to the third upper frame point 16. Thus, by including the third upper frame point 16 in the radiator 10 and the second switch 50 in the antenna structure 1, and electrically connecting the second switch 50 to the third upper frame point 16, dynamic tuning of the second antenna can be achieved. The function of the second switch 50 is to switch circuits or change part of the structure of the second antenna, thereby changing the resonant frequency or impedance of the second antenna. It can switch between different frequency bands, allowing the second antenna to adapt to different signal frequencies. For example, the addition of the third upper frame point 16 changes the effective length of the second antenna, thereby adjusting its resonant frequency. Through switch control, good radiation performance can be provided in different frequency ranges. Alternatively, by controlling the second switch 50 to change the input impedance of the second antenna, it can be better matched with the impedance of the feed line, thereby reducing signal reflection and improving the quality and efficiency of signal transmission.

[0049] Please refer to Figure 7 and Figure 8 , Figure 7 for Figure 6 The graph shows the relationship between the reflection coefficient and frequency of antenna structure 1. Figure 8 for Figure 6 A schematic diagram of the radiation efficiency of antenna structure 1 is shown. Figure 7 As shown, the resonant frequency of the first antenna can be adjusted by setting the first switch 40, and the resonant frequency of the second antenna can be adjusted by setting the second switch 50. The adjusted resonant frequency of the second antenna is located near the resonant frequency of the first antenna, and the resonant frequencies of the first and second antennas blend together, without forming an efficiency dip. Figure 8 As shown, after adjustment by the first switch 40 and the second switch 50, the antenna structure 1 has good radiation efficiency.

[0050] Table 1 compares the SAR of antenna structure 1 provided in this disclosure with that of antennas in related technologies. The antennas in related technologies are IFA antennas with parasitic stub structures. As shown in Table 1, in both the B3 and B1 bands, the TRP (Total Radiated Power) of antenna structure 1 provided in this disclosure is greater than that of antennas in related technologies. In both the B3 and B1 bands, the SAR of antenna structure 1 provided in this disclosure at 5mm on both the bottom and back sides of electronic device 100 is less than that of antennas in related technologies at the same locations. In both the B3 and B1 bands, the SAR of antenna structure 1 provided in this disclosure at 0mm on both the bottom and back sides of electronic device 100 is less than that of antennas in related technologies at the same locations. This demonstrates that the antenna structure 1 provided in this disclosure has a low SAR, which can reduce the electromagnetic radiation exposure of users when setting up the terminal. Furthermore, because the antenna structure 1 provided in this disclosure has a low SAR, some electronic devices 100 may not need to be equipped with SAR sensors, thereby saving the cost of the electronic devices 100.

[0051] Table 1

[0052]

[0053]

[0054] Table 2 compares the hand-touching reduction of antenna structure 1 provided in this disclosure and antennas in related technologies. As shown in Table 2, B3 HL GAP represents the hand-touching reduction with the left hand in the B3 band, B3 HR GAP represents the hand-touching reduction with the right hand in the B3 band, B1 HL GAP represents the hand-touching reduction with the left hand in the B1 band, and B1 HR GAP represents the hand-touching reduction with the right hand in the B1 band. This demonstrates that the hand-touching reduction of antenna structure 1 provided in this disclosure is lower than that of antennas in related technologies. Furthermore, the reduction gain is between 0.8 and 3.05, and the reduction gain is considerable.

[0055] Table 2

[0056]

[0057] This disclosure also provides an electronic device 100, including an antenna structure 1.

[0058] Please refer to Figure 9 , Figure 9This is a schematic diagram of the structure of an electronic device 100 provided in one embodiment of the present disclosure. The electronic device 100 includes a metal frame 2, and the radiator 10 is a portion of the metal frame 2. Specifically, the metal frame 2 includes an outer frame and an inner frame extending from the outer frame into the interior of the metal frame. An antenna slot 23 is formed by cutting a groove in the inner frame, such as... Figure 9 The blank area shown represents the location of antenna slot 23. Figure 9 In the design, the antenna slot 23 has a horizontal length of 20mm and a vertical length of 38mm. The outer frame of the metal frame 2 and the corresponding frame segment of the antenna slot 23 can serve as radiators 10. Thus, a portion of the metal frame 2 of the electronic device 100 can be used as a radiator 10 without increasing the size of the electronic device 100. Optionally, the electronic device 100 may also include components such as an SPK speaker 24, a SIM card slot 25, a USB interface 26, and a motor 27, located on the side of the metal frame 2 near the bottom.

[0059] In some possible implementations, the metal frame 2 includes a first frame segment 21 and a second frame segment 22. The first frame segment 21 is the bottom of the metal frame 2, and the second frame segment 22 is the side of the metal frame 2 and is bent and connected relative to the first frame segment 21. The free end 12 and the second grounding end 14 are located in the first frame segment 21, and the first grounding end 13 and the first upper frame point 11 are both located in the second frame segment 22. Figure 9 In the illustrated embodiment, the second upper frame point 15 is located in the first frame segment 21, and the third upper frame point 16 is located in the second frame segment 22. Thus, by making the first frame segment 21 the bottom of the metal frame 2 and the second frame segment 22 the side of the metal frame 2, and bending it relative to the first frame segment 21, the current of the antenna structure 1 is dispersed by increasing the length of the radiator 10, thereby reducing SAR, without increasing the volume of the electronic device 100. Furthermore, by dispersing the current of the antenna structure 1, the absorption of radiation from the antenna structure 1 by the hand when using the electronic device 100 is also reduced, thereby enhancing the antenna's radiation performance.

[0060] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An antenna structure, characterized by include: The radiator includes a first upper frame point, a free end, a first grounding end, and a second grounding end, wherein the first grounding end is directly grounded; the free end and the first grounding end are respectively located at both ends of the radiator, the free end is used to form an antenna gap, and the first upper frame point is located between the first grounding end and the second grounding end. A grounding component, one end of which is grounded and the other end is electrically connected to a second grounding terminal, wherein the second grounding terminal is inductively grounded through the grounding component; A feed point is electrically connected to the first upper frame point. The feed point excites the stub between the free end and the first upper frame point to form a first antenna, and the feed point excites the stub between the first ground end and the second ground end to form a second antenna. The resonant frequency of the first antenna in a first resonant mode and the resonant frequency of the second antenna in a second resonant mode are compatible, so that the first antenna and the second antenna do not form an efficiency pit. The first resonant mode and the second resonant mode may be the same or different.

2. The antenna structure of claim 1, wherein, The grounding component includes an inductor, capacitor, or metal component.

3. The antenna structure of claim 1, wherein, The first resonant mode is the IFA resonant mode, and the stub length between the first upper frame point and the free end is one-quarter of the wavelength of the first antenna.

4. The antenna structure of claim 1, wherein, The second resonant mode is a loop resonant mode, and the stub length between the first ground terminal and the second ground terminal is half the wavelength of the second antenna.

5. The antenna structure of claim 1, wherein, The radiator further includes a second upper frame point, and the antenna structure includes a first switch. The second upper frame point is located between the free end and the first upper frame point, and is positioned closer to the free end relative to the first upper frame point. The first switch is electrically connected to the second upper frame point.

6. The antenna structure of claim 5, wherein, The length of the branch between the second upper frame point and the free end is greater than or equal to 1 mm and less than or equal to 5 mm.

7. The antenna structure of claim 1, wherein, The radiator further includes a third upper frame point, and the antenna structure includes a second switch. The third upper frame point is located between the first grounding terminal and the second grounding terminal; the second switch is electrically connected to the third upper frame point.

8. An electronic device, comprising: Including the antenna structure as described in any one of claims 1-7.

9. The electronic device of claim 8, wherein, The electronic device includes a metal frame, and the radiator is a segment of the metal frame.

10. The electronic device of claim 9, wherein, The metal frame includes a first frame segment and a second frame segment. The first frame segment is the bottom of the metal frame, and the second frame segment is the side of the metal frame and is bent and connected relative to the first frame segment. The free end and the second grounding end are both located in the first frame segment, and the first grounding end and the first upper frame point are both located in the second frame segment.

Images