Antenna structure, middle frame and electronic device

Abstract

This disclosure relates to an antenna structure, a mid-frame, and an electronic device. The antenna structure includes a first stub and a second stub. The first stub has a feed point. A gap is provided between the second stub and the first stub. The gap between the feed point and the gap includes a first segment. The second stub has a first tuning circuit. The first tuning circuit is used to adjust the length of the second stub used for radiation. The gap between the first tuning circuit and the gap includes a second segment. When the antenna structure operates in a first frequency band, the second segment acts as a parasitic stub of the first segment to excite the eigenmode of the first frequency band. By adjusting the length of the second stub used for radiation through the first tuning circuit, the second segment acts as a parasitic stub of the first stub, thereby enhancing the radiation performance of the first frequency band and improving antenna efficiency. Simultaneously, adjusting the length of the second stub involved in radiation through the first tuning circuit can also take into account the radiation performance of other frequency bands.

Description

Technical Field

[0001] This disclosure relates to the field of electronic device technology, and more particularly to an antenna structure, a mid-frame, and an electronic device. Background Technology

[0002] With the development of electronic device technology, the design of electronic devices is becoming increasingly miniaturized and integrated, further reducing the design space reserved for antennas within electronic devices.

[0003] Currently, the common approach in related technologies is to integrate antennas of different frequency bands into the same antenna structure. This results in a certain decrease in antenna efficiency across different frequency bands, affecting the user experience. Utility Model Content

[0004] To overcome the problems existing in related technologies, this disclosure provides an antenna structure, a mid-frame, and an electronic device.

[0005] According to a first aspect of the present disclosure, an antenna structure is provided, comprising:

[0006] The first branch has a feed point;

[0007] The second branch has a gap between it and the first branch;

[0008] The feed point and the gap include a first segment, the second stub is provided with a first tuning circuit, the first tuning circuit is used to adjust the length of the second stub for radiation, the first tuning circuit and the gap include a second segment, and when the antenna structure is operating in the first frequency band, the second segment serves as a parasitic stub of the first segment.

[0009] In this embodiment, the second segment serves as a parasitic stub of the first segment to excite the eigenmode of the first frequency band. The length of the second stub used for radiation is adjusted by the first tuning circuit so that the second segment, as a parasitic stub of the first segment, enhances the radiation performance of the first frequency band when the antenna is operating in the first frequency band. At the same time, adjusting the length of the second stub involved in radiation by the first tuning circuit can also take into account the radiation performance of other frequency bands, thereby improving the antenna efficiency.

[0010] In one possible implementation, a first grounding point is provided at the end of the second branch away from the fracture, and a third segment is included between the first tuning circuit and the first grounding point. When the antenna structure operates in the second frequency band, the second segment and the third segment together serve as parasitic branches of the first branch.

[0011] The second frequency band is lower than the first frequency band.

[0012] In this embodiment, the antenna is tuned by setting a first tuning circuit, and the second and third segments of the second stub are used together as parasitic stubs of the first stub, thereby enhancing the radiation intensity of the antenna in the second frequency band. While ensuring that the antenna can have good radiation performance in the first frequency band, the radiation performance in the second frequency band is also taken into account, thus improving antenna efficiency and user communication experience.

[0013] In one possible implementation, the first stub is provided with a first circuit, and a fourth segment is included between the first circuit and the feed point. When the antenna structure operates in the first frequency band, the fourth segment is used to form a reverse magnetic parasitic effect.

[0014] In this embodiment of the present disclosure, when the antenna structure operates in the first frequency band, the fourth segment forms a reverse magnetic parasitic structure, which works together with the first and second segments in the first frequency band to further enhance the radiated signal in the first frequency band, thereby improving the radiation efficiency of the antenna in the first frequency band.

[0015] In one possible implementation, the length of the fourth segment is three times the length of the first segment.

[0016] In this embodiment, the length of the fourth segment needs to be three times the length of the first segment to ensure that the 3 / 4 mode and the 1 / 4 mode of the antenna used to radiate the first frequency band form reverse magnetic parasitics, thereby achieving the superposition of the antenna radiated signals and improving the antenna's radiation efficiency in the first frequency band.

[0017] In one possible implementation, a second grounding point is provided at the end of the first branch away from the feed point, a second tuning circuit is provided at the second grounding point, and a fifth segment is included between the second tuning circuit and the first circuit.

[0018] When the antenna structure operates in the first frequency band, the second tuning circuit is used to adjust the fifth segment to radiate in the third frequency band, which is higher than the first frequency band.

[0019] In this embodiment of the present disclosure, by setting a second tuning circuit, the length of the fifth segment participating in radiation is adjusted so that the radiation frequency band of the fifth segment is higher than the first frequency band, that is, outside the first frequency band, thereby avoiding interference of the radiation signal of the fifth segment to the first frequency band of the antenna.

[0020] In one possible implementation, the first stub includes a T-shaped antenna, the fifth segment includes a first part and a second part that are perpendicular to each other, the first segment, the fourth segment and the first part are connected in sequence, and the second tuning circuit is disposed in the second part.

[0021] In this embodiment, a T-shaped antenna is used, which is more in line with the overall antenna structure requirements. The second tuning circuit is located at the end of the first branch to adjust the length of the fifth segment used for radiation, so that the radiation frequency band of the fifth segment is outside the first frequency band, so as to avoid the fifth segment interfering with the first frequency band of the antenna.

[0022] In one possible implementation, the length of the fifth segment is n times that of the first segment, where n is a positive integer and is greater than or equal to 4.

[0023] In this embodiment, by setting the length of the fifth segment to more than four times the length of the first segment, the antenna signal radiated by the fifth segment falls outside the first frequency band, thereby avoiding the fifth segment from affecting the antenna radiation performance. When the antenna structure operates in the first frequency band, the entire structure radiates based on the intrinsic mode, compensating for the mode imbalance caused by the feed point being close to the gap, and improving the radiation efficiency of the antenna structure in the first frequency band.

[0024] In one possible implementation, the first circuit includes a first branch and a second branch connected in parallel, and when the antenna structure operates in the first frequency band, the current is transmitted through the first branch.

[0025] When the antenna structure operates in the second frequency band, the current is transmitted through the second branch.

[0026] In this embodiment of the disclosure, by switching the branches connected in the first circuit, the current is transmitted through different branches, which can realize the separation of signals in different operating frequency bands of the antenna, and ensure the overall radiation performance and usability of the antenna.

[0027] In one possible implementation, the sum of the lengths of the second segment and the third segment is 1 / 4λ2, wherein the wavelength of the second frequency band is λ2.

[0028] In this embodiment, the lengths of the second segment and the third segment are superimposed, and the two together serve as parasitic branches of the first branch. The radiated signal is the signal of the second frequency band. This compensates for the radiation performance of the second frequency band when the entire antenna structure takes the first frequency band as the main radiation band, improves the antenna radiation efficiency of the antenna structure in the second frequency band, and ensures that the entire antenna structure can simultaneously take into account the radiation effects of the first and second frequency bands.

[0029] In one possible implementation, the lengths of the first segment and the second segment can be categorized as follows:

[0030] The wavelength of the first frequency band is λ1, and the sum of the lengths of the first segment and the second segment is 1 / 2λ1.

[0031] In this embodiment of the disclosure, the lengths of the first segment and the second segment are designed to enable the antenna structure to operate in the eigenmode of the first frequency band, thereby improving the radiation efficiency of the antenna.

[0032] In one possible implementation, the antenna structure operates in the first frequency band, and the length of the fifth segment used for radiation falls outside an odd multiple of 1 / 4λ1, where the wavelength of the first frequency band is λ1.

[0033] In this embodiment of the disclosure, by ensuring that the length of the fifth segment used for radiation falls outside the odd multiples of 1 / 4λ1, it is ensured that the radiated signal of the fifth segment will not interfere with the operating mode of the antenna structure in the first frequency band (e.g., 1 / 4λ1 mode and 3 / 4λ1 mode), thereby improving the radiation efficiency of the antenna structure in the first frequency band and enhancing the antenna performance.

[0034] In one possible implementation, the antenna structure operates in the second frequency band, and the sum of the length of the fourth segment and the length of the fifth segment used for radiation ranges from 1 / 2λ2 to 3 / 4λ2, with the wavelength of the second frequency band being λ2.

[0035] In this embodiment, the fourth and fifth segments together serve as parasitic branches of the second branch, used to radiate signals in the second frequency band. By designing the sum of the length of the fourth segment and the length of the fifth segment used for radiation, the radiation performance of the antenna structure in the second frequency band is enhanced, thereby improving the radiation efficiency of the antenna.

[0036] According to a second aspect of the present disclosure, a mid-frame is provided, the mid-frame being provided with an antenna structure as described in the first aspect of the present disclosure.

[0037] In this embodiment of the disclosure, the mid-frame is provided with the above-mentioned antenna structure, which enhances the radiation performance of the mid-frame antenna in the first frequency band and improves the antenna efficiency.

[0038] According to a third aspect of the present disclosure, an electronic device is provided, the electronic device including an antenna structure as described in a first aspect of the present disclosure or a mid-frame as described in a second aspect of the present disclosure.

[0039] In this embodiment of the disclosure, the electronic device is provided with the above-mentioned antenna structure or mid-frame, thereby enhancing the radiation performance of the antenna and improving the communication experience of the user when using the electronic device.

[0040] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0042] Figure 1 This is a schematic diagram of an antenna structure in related technologies.

[0043] Figure 2 This is a schematic diagram of an antenna structure according to an exemplary embodiment.

[0044] Figure 3 This is a comparison chart of antenna efficiency in the N79 band before and after adopting the technical solution of the present disclosure embodiment.

[0045] Figure 4 This is a comparison chart of antenna efficiency in the N28 band before and after adopting the technical solution of the present disclosure embodiment. Detailed Implementation

[0046] 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 and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0047] With the development of electronic device technology, the design of electronic devices is becoming increasingly miniaturized and integrated. Therefore, the design space reserved for antennas within electronic devices is limited. Currently, related technologies typically employ a solution of integrating antennas of different frequency bands into the same antenna structure. This results in a certain degree of efficiency reduction for antennas of different frequency bands directly radiated within the antenna structure, affecting the user experience.

[0048] To address the aforementioned technical problems, this disclosure provides an antenna structure, a mid-frame, and an electronic device. In this embodiment, the feed point of the first stub is located near the gap to excite the eigenmode of the first frequency band. By incorporating a first tuning circuit in the second stub, the length of the second stub used for radiation is adjusted, making the second stub a parasitic stub of the first stub. This enhances the radiation performance of the first frequency band and improves antenna efficiency when the antenna operates in the first frequency band. Simultaneously, adjusting the length of the second stub involved in radiation through the first tuning circuit also takes into account the radiation performance of other frequency bands.

[0049] According to an exemplary embodiment, such as Figure 2As shown, this disclosure provides an antenna structure, such as a mid-frame antenna. A mid-frame antenna utilizes the metal frame of an electronic device as an antenna for radiating and receiving wireless signals. It features a compact structure, high aesthetic appeal, and excellent antenna performance, and is therefore widely used in various electronic devices. Of course, it is understood that the technical solution of this disclosure can also be applied to other types of antenna structures, and this disclosure does not impose excessive limitations on this.

[0050] like Figure 2 As shown, the antenna structure includes a first stub 10 and a second stub 20, with a gap 30 between them. The first stub 10 has a feed point 11. The second stub 20 has a first tuning circuit 41, which adjusts the length of the second stub 20 for radiation, enabling it to radiate antenna signals in different frequency bands. A first segment 12 connects the feed point 11 and the gap 30, and a second segment 22 connects the first tuning circuit 41 and the gap 30. When the antenna structure operates in the first frequency band, the second segment 22 acts as a parasitic stub of the first segment 12, enhancing the radiated signal of the first segment 12. When the first stub 10 is used to radiate antenna signals of different frequency bands, the length of the second stub 20 used for radiation can be adjusted by setting the first tuning circuit 41, thereby adjusting the radiation frequency of the second stub 20 to enhance the antenna performance of the first stub 10 in different frequency bands, thus ensuring that the antenna structure has good radiation performance in different frequency bands and improving antenna efficiency.

[0051] In related technologies, such as Figure 1 As shown, the antenna structure includes a first stub 10' and a second stub 20', with a gap 30' between the first stub 10' and the second stub 20'. The feed point 11' of the first stub 10' is located far from the gap 30' and lacks a tuning circuit. Therefore, when the antenna structure is working, the LOOP mode formed by the reverse current generated by the parasitic stub of the first stub 10' generates interference signals. The LOOP mode of the reverse current from the feed point 11' to the end of the first stub 10' near the gap 30' also generates interference signals. Both of these will cause an efficiency dip in the first frequency band, resulting in a decrease in antenna performance.

[0052] In this embodiment, the feed point 11 of the first stub 10 is located near the gap 30 to excite the eigenmode of the first frequency band. By setting a first tuning circuit in the second stub 20, the length of the second stub used for radiation is adjusted, thereby adjusting the radiation frequency of the parasitic stub of the first stub when the antenna is operating in the first frequency band, enhancing the radiation performance of the antenna in the first frequency band and improving the antenna efficiency.

[0053] In some embodiments, the second branch 20 further includes a third segment 23. For example... Figure 2 As shown, a first grounding point 21 is provided at the end of the second stub 20 away from the gap 30, and a third segment 23 is included between the first tuning circuit 41 and the first grounding point 21. When the antenna structure operates in the second frequency band, the second segment 22 and the third segment 23 together serve as parasitic stubs of the first stub 10 to enhance the antenna radiation intensity of the first stub 10 in the second frequency band. The second frequency band is lower than the first frequency band.

[0054] The following will combine Figure 2 The operating modes of the antenna structure according to embodiments of this disclosure will be described. For example... Figure 2 As shown, when the antenna structure operates in the first frequency band, the second segment 22 acts as a parasitic branch of the first stub 10. The first stub 10 and the second segment 22 jointly radiate antenna signals in the first frequency band to improve the antenna radiation efficiency in the first frequency band. When the antenna structure operates in the second frequency band, the second segment 22 and the third segment 23 jointly act as parasitic branches of the first stub 10. The first stub 10 and the second stub 20 jointly radiate antenna signals in the second frequency band to improve the antenna radiation efficiency in the second frequency band.

[0055] Because users demand lightweight and portable electronic devices, the space allocated for antenna design is limited in order to achieve integrated design. Therefore, it is usually necessary to integrate antennas of different frequency bands into the same antenna structure. However, when antennas of different frequency bands are integrated into the same antenna, interference will occur between the different frequency bands, resulting in a decrease in antenna efficiency. In this embodiment, by setting a first tuning circuit 41 to tune the antenna, the second segment 22 and the third segment 23 of the second stub 20 are used together as parasitic stubs of the first stub 10, thereby enhancing the radiation intensity of the antenna in the second frequency band. This ensures that the antenna has good radiation performance in both the first and second frequency bands, improving antenna efficiency and the user's communication experience.

[0056] In one example, the first frequency band includes the N79 band (4.4GHz to 5.0GHz), and the second frequency band includes the N28 band (703MHz to 748MHz uplink and 758MHz to 803MHz downlink). Both the N79 and N28 bands are commonly used in 5G communication. With the development of technology, the use and demand of social media and short video platforms have increased significantly. For large indoor scenarios (such as concerts, sports events, etc.), the requirements for transmission bandwidth and transmission rate are higher, requiring large capacity and high throughput. Most frequency bands are significantly weakened in this scenario, while the N79 band, as a high-bandwidth and high-speed band, has seen a significant increase in usage in such scenarios. Most antenna structures in related technologies are designed for signal radiation in the N28 band, which no longer meets the current needs of most users. In the electronic device of this disclosure, due to limited design space, it is necessary to integrate the antennas of the N79 and N28 frequency bands to achieve antenna signal radiation of the N79 and N28 frequency bands on the same antenna structure. In this disclosure embodiment, the first frequency band is designed as the N79 frequency band and the second frequency band is designed as the N28 frequency band, which can better meet the design and usage requirements. Of course, it is understood that the first and second frequency bands can also be set to other frequency bands, where the first frequency band is the high-frequency band of the two frequency bands and the second frequency band is the low-frequency band of the two frequency bands. Based on the frequencies of the first and second frequency bands, the relevant branches and the lengths of each segment involved in the antenna structure are adaptively adjusted. This disclosure embodiment does not impose too many restrictions on this.

[0057] In some embodiments, the first branch 10 is provided with a first circuit 43. For example... Figure 2 As shown, the first circuit 43 includes a fourth segment 13 between it and the feed point 11. When the antenna structure operates in the first frequency band, the current in the antenna structure flows from the end of the first stub 10 furthest from the feed point 11 to the end of the first stub 10 closest to the feed point 11, and then flows to the second stub 20. The fourth segment 13 can be used to form a reverse magnetic parasitic effect. In this embodiment, when the antenna structure operates in the first frequency band, the fourth segment 13 forms a reverse magnetic parasitic effect, achieving the superposition of the antenna radiated signals, thereby improving the antenna's radiation efficiency in the first frequency band.

[0058] In some embodiments, the length of the fourth segment 13 is three times the length of the first segment 12. In this embodiment, the length of the fourth segment 13 needs to be three times the length of the first segment 12 to ensure that the 3 / 4 mode and the 1 / 4 mode of the antenna used to radiate the first frequency band form reverse magnetic parasitics, thereby achieving the superposition of the antenna radiated signals and improving the radiation efficiency of the antenna in the first frequency band.

[0059] In some embodiments, the first branch 10 further includes a fifth segment 14. For example... Figure 2As shown, a second grounding point 15 is provided at the end of the first branch 10 furthest from the feed point 11. A second tuning circuit 42 is provided at the second grounding point 15, and a fifth segment 14 is included between the second tuning circuit 42 and the first circuit 43. When the antenna structure operates in the first frequency band, the second tuning circuit 42 is used to adjust the fifth segment 14 so that the fifth segment 14 radiates in the third frequency band. The third frequency band is higher than the first frequency band. In this embodiment of the present disclosure, by setting the second tuning circuit 42, the length of the fifth segment 14 participating in radiation is adjusted so that the radiation frequency band of the fifth segment 14 is higher than the first frequency band, that is, outside the first frequency band, thereby avoiding interference of the radiated signal of the fifth segment 14 to the first frequency band of the antenna, and thus improving the radiation efficiency of the antenna.

[0060] In some embodiments, the first branch 10 includes a T-type antenna. A T-type antenna is a commonly used vertically grounded antenna, generally used for long-wave and medium-wave communications. It is simple in structure, low in cost, easy to install and maintain, and has good radiation performance, making it suitable for various environments and application scenarios. Figure 2 As shown, the fifth segment 14 includes a first part 141 and a second part 142 that are perpendicular to each other. The first segment 12, the fourth segment 13, and the first part 141 are connected sequentially. Figure 2 Taking the orientation shown as an example, the vertical portion of the fifth segment 14 is the first part 141, and the horizontal portion of the fifth segment 14 is the second part 142. The second tuning circuit 42 is disposed in the second part 142. In this embodiment, using a T-shaped antenna better meets the overall antenna structure requirements. The second tuning circuit 42 is disposed at the end of the first branch 10 to adjust the length of the fifth segment 14 used for radiation, ensuring that the radiation frequency band of the fifth segment 14 is outside the first frequency band, thereby avoiding interference from the fifth segment 14 to the first frequency band of the antenna and improving the antenna's radiation efficiency.

[0061] In some embodiments, the length of the fifth segment 14 is n times that of the first segment 12, where n is a positive integer and greater than or equal to 4. For example... Figure 2 As shown, the length of the first segment 12 is L1, the length of the first part 141 of the fifth segment 14 is L5, and the length of the second part 142 of the fifth segment 14 is L6. Therefore, the length of the fifth segment 14 is L5 + L6, that is, L5 + L6 = n * L1, where n is a positive integer and n is greater than or equal to 4. In this embodiment, by setting the length of the fifth segment 14 to more than four times the length of the first segment 12, the antenna signal radiated by the fifth segment 14 falls outside the first frequency band, thereby avoiding the fifth segment 14 from affecting the antenna radiation performance. This allows the antenna structure to radiate based on the intrinsic mode when operating in the first frequency band, compensating for the mode imbalance caused by the feed point 11 being close to the gap 30, and improving the radiation efficiency of the antenna structure in the first frequency band.

[0062] In some embodiments, the length of the fifth segment 14 is L5 + L6 = 4 * L1. Here, L1 ranges from 2mm to 6mm, and L5 + L6 ranges from 8mm to 24mm. In one example, L1 = 4mm, then L5 + L6 = 16mm.

[0063] In some embodiments, when the antenna structure operates in different frequency bands, the first circuit 43 can switch the different branches it is connected to. The first circuit 43 may include a first branch (not shown in the figure) and a second branch (not shown in the figure) connected in parallel. When the antenna structure operates in the first frequency band, the current is transmitted through the first branch; when the antenna structure operates in the second frequency band, the current is transmitted through the second branch. In this embodiment of the present disclosure, by switching the branches connected in the first circuit 43, the signals of different frequency bands of the antenna can be separated, ensuring the overall radiation performance and usability of the antenna.

[0064] In one example, the frequency of the first frequency band is higher than that of the second frequency band. The first branch may include a capacitor. When the antenna structure operates in the first frequency band, the current is transmitted through the first branch, achieving the effect of passing high frequencies and blocking low frequencies, so as to ensure the radiation efficiency of the antenna in the first frequency band. The second branch may include an inductor. When the antenna structure operates in the second frequency band, the current is transmitted through the second branch, achieving the effect of passing low frequencies and blocking high frequencies, so as to ensure the radiation efficiency of the antenna in the second frequency band.

[0065] In some embodiments, the lengths of the first segment 12 and the second segment 22 range from 1 / 4λ1 to 1 / 2λ1, the wavelength of the first frequency band is λ1, and the sum of the lengths of the first segment 12 and the second segment 22 is 1 / 2λ1. Specifically, the length of the first segment 12 is L1, and the length of the second segment 22 is L2; ​​that is, the values ​​of L1 and L2 are both from 1 / 4λ1 to 1 / 2λ1, and L1 + L2 = 1 / 2λ1. In this embodiment, by designing the lengths of the first segment 12 and the second segment 22, the eigenmode of the antenna's first frequency band is realized, thereby improving the antenna's radiation efficiency.

[0066] In some embodiments, the length L1 of the first segment 12 ranges from 3mm to 5mm, and the length L2 of the second segment 22 ranges from 3.5mm to 5.5mm. In one example, the length L1 of the first segment 12 is 4mm, and the length L2 of the second segment 22 is 4.5mm.

[0067] In some embodiments, the sum of the lengths of the second segment 22 and the third segment 23 is 1 / 4λ2, where the wavelength of the second frequency band is λ2. The length of the second segment 22 is L2, and the length of the third segment 23 is L3, i.e., L2 + L3 = 1 / 4λ2. The second segment 22 and the third segment 23 together serve as parasitic branches of the first branch 10, with the third segment 23 acting as state compensation in the second frequency band to improve the antenna radiation efficiency of the antenna structure in the second frequency band.

[0068] In some embodiments, the length L3 of the third segment 23 ranges from 30mm to 50mm. In one example, the length L3 of the third segment 23 is 40mm.

[0069] In some embodiments, the antenna structure operates in the first frequency band, and the length of the fifth segment 14 used for radiation falls outside the odd-numbered harmonics of 1 / 4λ1, where the wavelength of the first frequency band is λ1. Figure 2 As shown, the length of the second part 142 of the fifth segment 14 is L6. Therefore, the length of the fifth segment 14 used for radiation is L5+L6, and L5+L6 falls outside the odd multiples of 1 / 4λ1. In this embodiment of the present disclosure, by ensuring that the length of the fifth segment 14 used for radiation falls outside the odd multiples of 1 / 4λ1, it is ensured that the radiated signal of the fifth segment 14 will not interfere with the antenna structure's operating modes in the first frequency band (e.g., 1 / 4λ1 mode and 3 / 4λ1 mode), thereby improving the radiation efficiency of the antenna structure in the first frequency band and enhancing antenna performance.

[0070] In some embodiments, the antenna structure operates in the second frequency band, and the sum of the length of the fourth segment 13 and the radiation-enhancing length of the fifth segment 14 ranges from 1 / 2λ² to 3 / 4λ², where the wavelength of the second frequency band is λ². Specifically, the length of the fourth segment 13 is L4, and the radiation-enhancing length of the fifth segment 14 is L5+L6, meaning L4+L5+L6 ranges from 1 / 2λ² to 3 / 4λ². In this embodiment, the fourth segment 13 and the fifth segment 14 together serve as parasitic branches of the second branch 20, used to radiate signals in the second frequency band. By designing the sum of the lengths of the fourth segment 13 and the radiation-enhancing lengths of the fifth segment 14, the radiation performance of the antenna structure in the second frequency band is enhanced, improving the antenna's radiation efficiency.

[0071] The following will combine Figures 3-4 The technical effects of the technical solutions in the embodiments of this disclosure will be explained.

[0072] like Figure 3 As shown, Figure 3This figure shows a comparison of antenna efficiency in the N79 band before and after adopting the technical solution of this disclosure. The horizontal axis represents frequency in GHz, and the vertical axis represents antenna efficiency in dB. Curve a in the figure represents the antenna efficiency in the N79 band before adopting the technical solution of this disclosure, and curve b represents the antenna efficiency in the N79 band after adopting the technical solution of this disclosure. Comparing curves a and b, it is clear that after adopting the technical solution of this disclosure, the antenna efficiency in the N79 band is improved by 4-5 dB.

[0073] like Figure 4 As shown, Figure 4 This is a comparison chart of antenna efficiency in the N28 band before and after adopting the technical solution of the present disclosure. The horizontal axis represents frequency in GHz, and the vertical axis represents antenna efficiency in dB. Curve c represents the antenna efficiency in the N28 band before adopting the technical solution of the present disclosure, and curve d represents the antenna efficiency in the N28 band after adopting the technical solution of the present disclosure. Comparing curves c and d, it is clear that after adopting the technical solution of the present disclosure, the antenna efficiency in the N28 band is improved by approximately 0.8 dB.

[0074] Therefore, it can be seen that the technical solution of this disclosure embodiment has a significant improvement in antenna efficiency in both the N79 and N28 frequency bands, and can improve antenna radiation performance.

[0075] According to an exemplary embodiment, such as Figure 2 As shown in the figure, this embodiment provides a mid-frame (not shown), which may be a metal mid-frame, and the mid-frame is provided with an antenna structure as described in the above embodiment. The antenna structure includes a first stub 10 and a second stub 20, with a gap 30 between the first stub 10 and the second stub 20. The first stub 10 is provided with a feed point 11. The second stub 20 is provided with a first tuning circuit 41, which is used to adjust the length of the second stub 20 for radiation, so that the second stub 20 can be used to radiate antenna signals of different frequency bands. A first segment 12 is included between the feed point 11 and the gap 30, and a second segment 22 is included between the first tuning circuit 41 and the gap 30. When the antenna structure operates in the first frequency band, the second segment 22 acts as a parasitic stub of the first segment 12, enhancing the radiated signal of the first segment 12.

[0076] In this embodiment of the disclosure, the mid-frame is provided with the above-mentioned antenna structure, which enhances the radiation performance of the mid-frame antenna in the first frequency band and improves the antenna efficiency.

[0077] According to an exemplary embodiment, such as Figure 2As shown, this disclosure provides an electronic device, such as a mobile terminal, laptop computer, tablet computer, smartwatch, smart bracelet, or other electronic device with communication functions. The electronic device includes the antenna structure or mid-frame described in the above embodiments.

[0078] In this embodiment of the disclosure, the electronic device is provided with the above-mentioned antenna structure or mid-frame, thereby enhancing the radiation performance of the antenna and improving the communication experience of the user when using the electronic device.

[0079] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0080] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An antenna structure, characterized by include: The first branch has a feed point; The second branch has a gap between it and the first branch; The feed point and the gap include a first segment, the second stub is provided with a first tuning circuit, the first tuning circuit is used to adjust the length of the second stub for radiation, the first tuning circuit and the gap include a second segment, and when the antenna structure is operating in the first frequency band, the second segment serves as a parasitic stub of the first segment.

2. The antenna structure of claim 1, wherein, The second branch has a first grounding point at the end away from the fracture. The first tuning circuit and the first grounding point include a third segment. When the antenna structure operates in the second frequency band, the second segment and the third segment together serve as parasitic branches of the first branch. The second frequency band is lower than the first frequency band.

3. The antenna structure of claim 2, wherein, The first stub is provided with a first circuit, and a fourth segment is included between the first circuit and the feed point. When the antenna structure operates in the first frequency band, the fourth segment is used to form a reverse magnetic parasitic.

4. The antenna structure of claim 3, wherein, The length of the fourth segment is three times the length of the first segment.

5. The antenna structure of claim 3, wherein, A second grounding point is provided at the end of the first branch away from the feed point, and a second tuning circuit is provided at the second grounding point. The second tuning circuit and the first circuit include a fifth segment. When the antenna structure operates in the first frequency band, the second tuning circuit is used to adjust the fifth segment to radiate in the third frequency band, which is higher than the first frequency band.

6. The antenna structure of claim 5, wherein, The first stub includes a T-shaped antenna, and the fifth segment includes a first part and a second part that are perpendicular to each other. The first segment, the fourth segment, and the first part are connected in sequence, and the second tuning circuit is disposed in the second part.

7. The antenna structure of claim 5, wherein, The length of the fifth segment is n times that of the first segment, where n is a positive integer and is greater than or equal to 4.

8. The antenna structure of claim 5, wherein, The first circuit includes a first branch and a second branch connected in parallel. When the antenna structure operates in the first frequency band, the current is transmitted through the first branch. When the antenna structure operates in the second frequency band, the current is transmitted through the second branch.

9. The antenna structure of any of claims 5 to 8, wherein, The sum of the lengths of the second segment and the third segment is 1 / 4λ2, where the wavelength of the second frequency band is λ2.

10. The antenna structure according to any one of claims 1 to 8, characterized in that The lengths of the first segment and the second segment range from 1 / 4λ1 to 1 / 2λ1, the wavelength of the first frequency band is λ1, and the sum of the lengths of the first segment and the second segment is 1 / 2λ1.

11. The antenna structure of any one of claims 5 to 8, wherein, The antenna structure operates in the first frequency band, and the length of the fifth segment used for radiation falls outside the odd multiple of 1 / 4λ1, where the wavelength of the first frequency band is λ1.

12. The antenna structure of claim 9, wherein, The antenna structure operates in the second frequency band, and the sum of the length of the fourth segment and the length of the fifth segment used for radiation has the following range: The wavelength of the second frequency band is λ2, which is between 1 / 2λ2 and 3 / 4λ2.

13. A middle frame, characterized in that, The middle frame is provided with an antenna structure as described in any one of claims 1 to 12.

14. An electronic device, comprising: The electronic device includes the antenna structure as described in any one of claims 1 to 12 or the mid-frame as described in claim 13.

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