Antenna structure and electronic device
By designing a slot and return point antenna structure on the metal frame of electronic devices, a high-efficiency radiation performance improvement in the low-frequency band is achieved, which is suitable for thin and light candybar and foldable electronic devices.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HUAWEI TECH CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-07-30
AI Technical Summary
As electronic devices become thinner and lighter and screen sizes are maximized, the clearance around the metal frame is reduced, resulting in a sharp decline in the radiation performance of antennas in low-frequency bands, especially in the LB band where efficiency is poor.
Design an antenna structure comprising a first, second, and third section of a metal frame, with slots and return points provided. The first and second radiating sections are fed through a feed section, allowing them to couple with each other and form superimposed currents in the same direction, thereby improving radiation performance.
Improving antenna efficiency and expanding bandwidth in low-frequency bands makes it suitable for flat and foldable electronic devices, ensuring good radiation performance even in confined space.
Smart Images
Figure CN2025117490_30072026_PF_FP_ABST
Abstract
Description
Antenna structure and electronic equipment
[0001] This invention claims priority to Chinese Patent Application No. 202510114610.2, filed with the State Intellectual Property Office of China on January 23, 2025, entitled “Antenna Structure and Electronic Equipment”, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of electronic product technology, specifically to an antenna structure and electronic device. Background Technology
[0003] As mobile phones and other electronic devices become thinner and lighter, the metal frame of these devices can act as an antenna radiator. However, with the pursuit of maximizing screen size, the environment around the metal frame has an increasingly significant impact on the antenna's radiation performance, especially causing a sharp decline in the antenna's radiation performance in the low-frequency band (LB band). Summary of the Invention
[0004] In view of this, this application provides an antenna structure and electronic device to solve the problem of poor antenna efficiency in the low frequency band (LB band).
[0005] In a first aspect, embodiments of this application provide an antenna structure, comprising a metal frame and a feed section. The metal frame includes a first segment, a second segment, and a third segment, with both ends of the third segment connected to the first segment and the second segment, respectively. A first slot is provided on the first segment, a second slot is provided on the second segment, and a third slot and a fourth slot are provided on the third segment, with the third slot located between the first segment and the fourth slot, and the fourth slot located between the second segment and the third slot. A first return point is provided on the first segment, and the portion of the first segment located between the first slot and the first return point forms a first radiating element. A second return point is provided on the second segment, and the portion of the second segment located between the second slot and the second return point forms a second radiating element. The feed section is electrically connected to any one of the first segment, the second segment, or the third segment, wherein the feed section is used to feed the first radiating element and the second radiating element, causing the first radiating element and the second radiating element to resonate in a first frequency band.
[0006] In this application, a first radiating section and a second radiating section can be formed opposite to each other. The current signal fed by the feed section can be transmitted to one of the first and second radiating sections and coupled to the other through the third and fourth slits. This allows for the distribution of current in the same direction on the first and second radiating sections, resulting in the superposition of the current signals and thus enhancing the efficiency and radiation performance of the antenna structure. Furthermore, this antenna structure, including the first, second, and third sections, has a large aperture and a large electrical length in the low-frequency band, achieving high efficiency. Moreover, this antenna structure can be mounted on one side of the hinge in a foldable device, eliminating the need for cross-axis mounting. It is suitable for both candybar and foldable electronic devices, making it applicable to a wide range of scenarios.
[0007] In one possible implementation, the first frequency band is less than 1 GHz. Exemplarily, the first frequency band includes a low-frequency (LB) band, and the first radiator and the second radiator can resonate in the low-frequency LB band. The low-frequency LB band can have multiple resonant modes; exemplarily, the multiple resonant modes can include a dominant mode and parasitic modes, where the dominant mode can have the highest efficiency, and the parasitic modes can improve efficiency and extend bandwidth.
[0008] In one possible implementation, the antenna structure includes a first resonant mode in which the current direction on the first radiating part is the same as the current direction on the second radiating part. The efficiency of the first resonant mode can be improved by the superposition of the currents in the same direction on the first and second radiating parts.
[0009] In one possible implementation, the frequency band corresponding to the first resonant mode is 698MHz to 960MHz. Within the 698MHz to 960MHz frequency band, the superposition of the unidirectional currents on the first and second radiating parts can enable the antenna structure to reach its peak efficiency, thus giving the antenna structure good efficiency in the low-frequency LB band.
[0010] In one possible implementation, the antenna structure further includes a first tuning unit electrically connected to a position on the third segment near the third slit, for tuning the current distribution of the first radiating part. In this embodiment, the current signal fed by the feed section can flow sequentially along the third and second segments to the second radiating part. The first tuning unit can guide the current signal, causing a portion of the current signal fed by the feed section into the third segment to be coupled to the first radiating part sequentially through the fourth and third slits, thereby enabling the first and second radiating parts to have a current distribution in the same direction, improving the efficiency of the antenna structure.
[0011] In one possible implementation, the first tuning unit includes a first switching assembly and a first electronic device, the first electronic device being connected to the first switching assembly. The first electronic device may include a capacitor or an inductor, or a combination of capacitor and inductor. The first switching assembly can switch the connection of the first electronic device in the antenna structure by opening or closing to match appropriate capacitance and / or inductance values, thereby enabling switching between different operating frequency bands.
[0012] In one possible implementation, the antenna structure further includes a second tuning unit electrically connected to the second segment or the third segment, used to tune the current distribution of the second radiating section. In this embodiment, through the tuning function of the second tuning unit, the current signal fed by the feed section can flow sequentially along the third segment and the second segment to the second radiating section. Simultaneously, in cooperation with the first tuning unit, the antenna structure can switch between different operating frequency bands, and the first and second radiating sections can have the same current distribution, improving the efficiency of the antenna structure.
[0013] In one possible implementation, the second tuning unit includes a second switching assembly and a second electronic device connected to the second switching assembly. The second electronic device may include a capacitor or an inductor, or a combination of both. The second switching assembly can switch the connection of the second electronic device in the antenna structure by opening or closing to match appropriate capacitance and / or inductance values, thereby enabling switching between different operating frequency bands.
[0014] In one possible implementation, the antenna structure further includes a third tuning unit connected to the second return point for tuning the current distribution of the second radiating element.
[0015] In one possible implementation, the third tuning unit includes a third switching assembly and a third electronic device, the third electronic device being connected to the third switching assembly, and the third switching assembly being connected to the second return point. Through the cooperation of the first tuning unit, the second tuning unit, and the third tuning unit, the antenna structure can switch between different operating frequency bands.
[0016] In one possible implementation, the metal frame serves as the border of the electronic device. The first segment is located on the first side of the electronic device, the second segment on the second side, and the third segment on the third side, with the first and second sides being adjacent to the third side. The first, second, and third segments can be distributed across the three sides of the electronic device, allowing the antenna structure to have a larger aperture and a longer electrical length in the low-frequency band, resulting in higher efficiency. Furthermore, in this arrangement, the first, second, and third segments can all be located on either the first or second body of the foldable electronic device, eliminating the need for cross-axis antenna configuration. This means the antenna structure is suitable for both candybar and foldable electronic devices, achieving good efficiency even with limited surrounding clearance.
[0017] In one possible implementation, the widths of the first slit, the second slit, the third slit, and the fourth slit are between 0.2 mm and 1.5 mm. For example, the widths of the first slit, the second slit, the third slit, and the fourth slit can be between 0.8 mm and 1.2 mm. This ensures the effectiveness of each slit in guiding the current, allowing the current to be distributed in the same direction in the first radiating part and the second radiating part, thereby achieving high efficiency after the current in the first radiating part and the second radiating part are superimposed in the same direction.
[0018] Secondly, embodiments of this application also provide an electronic device, which includes the antenna structure provided in the first aspect of this application. The electronic device including the aforementioned antenna structure has similar technical effects to the aforementioned antenna structure, and will not be described in detail here.
[0019] In one possible implementation, the electronic device is a foldable electronic device. The antenna structure provided in this application embodiment can be located on one side of the pivot, without needing to be configured across the pivot, and can be applied to foldable electronic devices.
[0020] In one possible implementation, the electronic device includes a first body, a second body, and a rotating shaft, wherein the first body and the second body are located on opposite sides of the rotating shaft and are both rotatably connected to the rotating shaft. The antenna structure is disposed on either the first body or the second body.
[0021] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;
[0024] Figure 2 is a partial schematic diagram of the application of an antenna structure in a mobile phone in a related technology;
[0025] Figure 3 is a partial schematic diagram of the application of an antenna structure in a mobile phone in another related technology;
[0026] Figure 4 is a schematic diagram of the structure of the foldable electronic device provided in an embodiment of this application;
[0027] Figure 5 is a schematic diagram of the antenna structure provided in the embodiments of this application applied in an electronic device;
[0028] Figure 6 is a schematic diagram of an antenna structure provided in one embodiment of this application;
[0029] Figure 7 is an S11 curve diagram of an antenna structure provided in an embodiment of this application;
[0030] Figure 8 is an efficiency curve of an antenna structure provided in one embodiment of this application;
[0031] Figure 9 is a schematic diagram of an antenna structure provided in another embodiment of this application;
[0032] Figure 10 is a partial schematic diagram of the antenna structure at the first tuning unit according to an embodiment of this application;
[0033] Figure 11 is a partial schematic diagram of the antenna structure at the second tuning unit according to an embodiment of this application;
[0034] Figure 12 is an S11 curve diagram of an antenna structure provided in another embodiment of this application;
[0035] Figure 13 is an efficiency curve of an antenna structure provided in another embodiment of this application;
[0036] Figure 14 is an efficiency curve of an antenna structure provided in another embodiment of this application;
[0037] Figure 15 is a schematic diagram of an antenna structure provided in another embodiment of this application;
[0038] Figure 16 is a partial schematic diagram of the antenna structure at the first tuning unit according to another embodiment of this application;
[0039] Figure 17 is a partial schematic diagram of the antenna structure at the second tuning unit according to another embodiment of this application;
[0040] Figure 18 is an S11 curve diagram of an antenna structure provided in another embodiment of this application;
[0041] Figure 19 is an efficiency curve of an antenna structure provided in another embodiment of this application;
[0042] Figure 20 is a schematic diagram of an antenna structure provided in another embodiment of this application;
[0043] Figure 21 is a partial schematic diagram of the antenna structure at the first tuning unit according to another embodiment of this application;
[0044] Figure 22 is a partial schematic diagram of the antenna structure at the second tuning unit according to another embodiment of this application;
[0045] Figure 23 is an S11 curve diagram of an antenna structure provided in another embodiment of this application;
[0046] Figure 24 is an efficiency curve of an antenna structure provided in another embodiment of this application.
[0047] Reference numerals: 100-Electronic device; 110-Metal frame; 120-First body; 130-Second body; 140-Hinge; 150-Antenna structure; 200-Foldable electronic device; 1-Metal frame; 11-First segment; 111-First slot; 112-First return point; 113-First radiating part; 12-Second segment; 121-Second slot; 122-Second return point; 123-Second radiating part; 13-Third segment; 131-Third slot; 132-Fourth slot; 2-Feeding part; 3-First tuning unit; 3a-First branch; 3b-Second branch; 31-First switch assembly; 311-First switch; 312-Second switch; 313- Fifth switch; 314-Sixth switch; 315-Eleventh switch; 32-First electronic component; 321-First inductor; 322-Second inductor; 323-Fifth inductor; 324-Sixth inductor; 325-Eighth inductor; 33-First capacitor; 34-Fifth capacitor; 4-Second tuning unit; 4a-Third branch; 4b-Fourth branch; 4c-Fifth branch; 4d-Sixth branch; 41-Second switch assembly; 411-Third switch; 412-Fourth switch; 413-Seventh switch; 414-Eighth switch; 415-Twelfth switch; 416-Thirteenth switch; 42-Second electronic component; 421-Third inductor; 422-Fourth inductor; 423-Seventh inductor; 424-Second capacitor; 425-Sixth capacitor; 426-Seventh capacitor; 43-Third capacitor; 44-Ninth switch; 45-Fourth capacitor; 46-Tenth switch; 5-Third tuning unit; 5a-Seventh branch; 5b-Eighth branch; 5c-Ninth branch; 51-Third switching assembly; 511-Fourteenth switch; 512-Fifteenth switch; 513-Sixteenth switch; 52-Third electronic device; 521-Ninth inductor; 522-Tenth inductor. Detailed Implementation
[0048] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0049] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0050] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0051] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0052] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0053] Antennas are crucial components in mobile phones and other electronic devices used for transmitting or receiving electromagnetic signals. As users' demands for mobile phones and other electronic devices increase, these devices are evolving towards thinner, lighter, and more sophisticated designs. These electronic devices can include mobile phones, tablets, laptops, smart home devices, smart bracelets, smartwatches, smart helmets, smart glasses, etc. Electronic devices can also be handheld devices with wireless communication capabilities, computing devices, other processing devices connected to a wireless modem, in-vehicle devices, electronic devices in 5G networks, or electronic devices in future public land mobile networks (PLMNs), etc. This application does not limit these categories. Figure 1 exemplarily illustrates an electronic device 100 provided in one embodiment of this application, using a mobile phone as an example for illustration.
[0054] To improve the slim and lightweight design of mobile phones and other electronic devices, the space for antennas and other electronic components inside these devices is further compressed. For example, as shown in Figure 1, to enhance the texture of the phone, a metal frame 110 can be used. At the same time, to further improve the slimness of the phone, a portion of the metal frame 110 can be used as part of the antenna.
[0055] However, with the extreme pursuit of maximizing the screen size of electronic devices, the space occupied by the metal frame 110 is further compressed, and the space for various components inside the electronic device is also compressed. Some components will be closer to the part of the metal frame 110 that serves as the antenna. This will reduce the clearance around the antenna and reduce the radiation performance of the antenna, especially causing a sharp drop in the radiation performance of the antenna in the low frequency band (LB band).
[0056] Figure 2 is a partial schematic diagram of the application of antenna structure 150 in a mobile phone in a related technology. As shown in Figure 2, antenna structure 150 is located on the adjacent side and bottom edge of the electronic device, making antenna structure 150 "L" shaped. Due to the small clearance near antenna structure 150 inside the mobile phone, the radiation performance of this type of antenna structure cannot achieve ideal results. Especially for the LB band, due to the low frequency and long wavelength, the electrical length of antenna structure 150 is short, making it difficult to achieve good radiation performance. For example, the system efficiency of antenna structure 150 at the 0.82GHz resonant point is -5.67dB when not touched, and -8.85dB when touched. The system efficiency of antenna structure 150 at the 0.82GHz resonant point is low when not touched, and the system efficiency drops significantly by 3dB when touched.
[0057] The system efficiency of the antenna structure 150 of the electronic device is higher when it is not touched by hand than when it is touched by hand. The state of the electronic device when it is not touched by hand can be the state where the electronic device is not held by hand. In this state, the location of the antenna structure 150 on the electronic device is not blocked, resulting in better radiation performance. The state of the electronic device when touched by hand can be the state where the electronic device is held by the user. For example, taking a mobile phone as an example, when a user makes a call, they hold the phone close to their ear. In this case, the hand and ear will block the location of the antenna structure 150 on the electronic device, affecting the radiation performance of the antenna structure 150, making the system efficiency of the antenna structure 150 lower than that of the mobile phone when it is not touched by hand. The touching and non-touching states of the electronic device mentioned below are consistent with the touching and non-touching states of the mobile phone described in this embodiment, and will not be repeated.
[0058] Figure 3 is a partial schematic diagram of the application of antenna structure 150 in a mobile phone in another related technology. As shown in Figure 3, antenna structure 150 can be located on one side of the mobile phone. For example, the metal frame 110 on one side of the mobile phone can be used as the radiator of antenna structure 150, that is, the length of the radiator is greater than 1 / 2 of the length of the mobile phone. This antenna structure 150 has a large length, that is, antenna structure 150 has a large radiation aperture, which makes antenna structure 150 have better efficiency. For example, the system efficiency of antenna structure 150 at the resonant point corresponding to 0.83GHz is -4.74dB when not touching the electronic device and -6.45dB when touching the electronic device. Compared with the antenna structure 150 shown in Figure 2, the antenna structure 150 shown in Figure 3 has improved system efficiency when not touching the electronic device, and the system efficiency drop when touching the electronic device is small, within 2dB. However, this antenna structure 150 needs to be set on at least one complete or nearly complete side of the electronic device, which means that this antenna structure 150 can only be used in candybar electronic devices without foldable function.
[0059] Figure 4 is a schematic diagram of the structure of the foldable electronic device provided in the embodiment of this application. As shown in Figure 4, the foldable electronic device 200 includes a first body 120, a second body 130, and a pivot 140. The first body 120 and the second body 130 can rotate relative to the pivot 140. If one side of the foldable electronic device 200 is entirely used as an antenna structure 150, a portion of the antenna structure 150 needs to be disposed on the first body 120, and the other portion needs to be disposed on the second body 130. However, the antenna structure 150 on the first body 120 and the antenna structure 150 on the second body 130 need to be disconnected in the pivot 140 area, and the antenna structure 150 on the first body 120 and the antenna structure 150 on the second body 130 cannot be connected by transmission lines such as twisted pair cables, coaxial cables, fiber optic cables, power cords, HDMI cables, and USB cables. Generally, a connection is required through the cooperation of a flexible circuit board and a connector. However, the insertion loss of the connector on the flexible circuit board is relatively large, which causes the antenna structure 150 to not perform well in the LB band. Therefore, using the metal frame 110 on one side of the electronic device as the radiator of the antenna structure 150 is not suitable for foldable electronic devices.
[0060] Therefore, embodiments of this application provide an antenna structure that can solve the problem of low efficiency of the above-mentioned antenna in the low frequency band (LB band).
[0061] The antenna structure provided in this application embodiment can be applied in electronic devices, which can be either candybar-type or foldable electronic devices.
[0062] Taking the foldable electronic device shown in Figure 4 as an example, the foldable electronic device 200 includes a first body 120, a second body 130, and a hinge 140. The first body 120 and the second body 130 are located on both sides of the hinge 140 and are rotatably connected to the hinge 140 to enable the electronic device to switch between a flattened state and a folded state. For example, when the electronic device is a foldable mobile phone, the first body 120 and the second body 130 can be the mid-frame of the phone, which can support numerous electronic components. Furthermore, the electronic device may also include a display module that covers the first body 120, the second body 130, and the hinge 140. When the first body 120 and the second body 130 rotate relative to the hinge 140, the first body 120 and the second body 130 can cause the display module to flatten or bend.
[0063] The electronic device may include a metal frame 110, which can enhance the texture of the electronic device. At least a portion of the metal frame 110 can serve as a component of the antenna structure, thereby saving space for antenna structure placement, reducing the number of antenna structure components, facilitating the thinning and lightening of the electronic device, and also increasing the clearance near the antenna structure.
[0064] Figure 5 is a schematic diagram of the antenna structure provided in this application applied to an electronic device. As shown in Figure 5, the antenna structure includes a metal frame 1, which can be part of the metal frame 110 of the electronic device. The metal frame 1 includes a first segment 11, a second segment 12, and a third segment 13, with the two ends of the third segment 13 connected to the first segment 11 and the second segment 12, respectively. The first segment 11, the second segment 12, and the third segment 13 are different parts of the metal frame 110 of the electronic device. In one embodiment, the first segment 11, the second segment 12, and the third segment 13 can be a one-piece molded structure.
[0065] As shown in Figure 5, when the antenna structure is installed in the foldable electronic device, the antenna structure can be installed in the first body 120 or the second body 130 of the foldable electronic device. Figure 5 exemplarily shows the antenna structure installed in the second body 130.
[0066] As shown in Figure 5, the electronic device may include a first side, a second side, and a third side, wherein the first side and the third side are adjacent, the second side and the third side are adjacent, and the first side and the second side are opposite to each other, for example, the first side and the second side are parallel to each other, and both the first side and the second side are perpendicular to the third side. The first segment 11 may be disposed on the first side of the electronic device, the second segment 12 may be disposed on the second side of the electronic device, and the third segment 13 may be disposed on the third side of the electronic device. The first segment 11 and the second segment 12 are parallel to each other, and both the first segment 11 and the second segment 12 may be perpendicular to the third segment 13.
[0067] The first segment 11, the second segment 12, and the third segment 13 can be distributed on three sides of the electronic device, giving the antenna structure a large aperture and a large electrical length in the low-frequency band, thus achieving high efficiency. In this arrangement, the first segment 11, the second segment 12, and the third segment 13 can all be set on the first body 120 or the second body 130 of the foldable electronic device. The antenna structure does not need to be set across the axis, meaning that the antenna structure is suitable for both candybar electronic devices and foldable electronic devices. Even with limited surrounding clearance, it can achieve good efficiency in both candybar and foldable electronic devices.
[0068] Figure 6 is a schematic diagram of an antenna structure provided in one embodiment of this application. As shown in Figure 6, a first slot 111 is provided on the first segment 11, a second slot 121 is provided on the second segment 12, and a third slot 131 and a fourth slot 132 are provided on the third segment 13. The third slot 131 is located between the first segment 11 and the fourth slot 132, and the fourth slot 132 is located between the second segment 12 and the third slot 131. The first segment 11 is in a disconnected state at the first slot 111, that is, the portions of the first segment 11 located on both sides of the first slot 111 do not contact each other. The second segment 12 is in a disconnected state at the second slot 121, that is, the portions of the second segment 12 located on both sides of the second slot 121 do not contact each other. The third segment 13 is in a disconnected state at the third slot 131 and the fourth slot 132, that is, the portions of the third segment 13 located on both sides of the third slot 131 and the portions located on both sides of the fourth slot 132 do not contact each other.
[0069] In this embodiment, for the first segment 11 and the second segment 12 made of metal, the first slit 111 and the second slit 121 can be symmetrically arranged on opposite sides of the electronic device to improve its appearance. In some other embodiments, the first slit 111 and the second slit 121 can also be asymmetrically arranged, which is not limited in this embodiment.
[0070] In some other embodiments, the first slit 111, the second slit 121, the third slit 131 and the fourth slit 132 may also be filled with insulating materials, such as plastics, rubbers, ceramics, etc., and this embodiment does not limit this.
[0071] As shown in Figure 6, a first grounding point 112 is provided on the first segment 11 for grounding. The portion of the first segment 11 located between the first slit 111 and the first grounding point 112 forms a first radiating portion 113. A second grounding point 122 is provided on the second segment 12 for grounding. The portion of the second segment 12 located between the second slit 121 and the second grounding point 122 forms a second radiating portion 123. The first radiating portion 113 and the second radiating portion 123 are used to radiate electromagnetic waves.
[0072] As shown in Figure 6, the antenna structure also includes a power feed section 2, which can be made of conductors such as iron or copper foil. The power feed section 2 is electrically connected to any one of the first segment 11, the second segment 12, or the third segment 13. For example, the power feed section 2 can be electrically connected to any one of the first segment 11, the second segment 12, or the third segment 13 via a coaxial cable, microstrip line, or metal spring. The power feed section 2 can be connected to any position on any one of the first segment 11, the second segment 12, or the third segment 13 according to the actual structural layout of the electronic device.
[0073] For example, as shown in FIG6, the power supply unit 2 can be disposed on the third segment 13 at a position between the fourth slit 132 and the second segment 12. In electronic devices, voice devices and other components are usually disposed near the third segment 13 and the first segment 11, where space is limited. In this embodiment, the power supply unit 2 can be disposed on the third segment 13 at a position between the fourth slit 132 and the second segment 12, which can provide clearance for voice devices and other components and avoid interference.
[0074] For example, if there is sufficient space in the vicinity of the first segment 11 or the second segment 12, the power supply unit 2 can also be provided on the first segment 11 or the second segment 12, thereby facilitating the flexible arrangement of the power supply unit 2 according to the structure of the electronic device.
[0075] The power supply unit 2 is used to power the first radiating unit 113 and the second radiating unit 123, so that the first radiating unit 113 and the second radiating unit 123 resonate in the first frequency band.
[0076] As shown in Figure 6, the power supply section 2 can be disposed on the third segment 13 at a position between the fourth slit 132 and the second segment 12. The power supply section 2 can feed a current signal to the second radiating section 123. At the same time, through the current coupling effect of the third slit 131 and the fourth slit 132, the current signal fed by the power supply section 2 can be guided to the first radiating section 113. The current signals of the first radiating section 113 and the second radiating section 123 can be superimposed on each other, thereby enhancing efficiency and improving the radiation performance of the antenna structure.
[0077] In other embodiments, the power supply section 2 can be located in other positions. For example, the power supply section 2 can be located on the third segment 13 between the third slit 131 and the first segment 11. The power supply section 2 can feed a current signal to the first radiating section 113. Through the current coupling effect of the third slit 131 and the fourth slit 132, the current signal fed by the power supply section 2 can be guided to the second radiating section 123. Thus, the current signals of the first radiating section 113 and the second radiating section 123 can be superimposed on each other, thereby enhancing efficiency and improving the radiation performance of the antenna structure.
[0078] The first slit 111, the second slit 121, the third slit 131, and the fourth slit 132 all have a small width. For example, the width of the first slit 111, the second slit 121, the third slit 131, and the fourth slit 132 can be between 0.2 mm and 1.5 mm. For instance, the width of the first slit 111, the second slit 121, the third slit 131, and the fourth slit 132 can be between 0.8 mm and 1.2 mm. This ensures the effectiveness of each slit in guiding the current, allowing the current to be distributed in the same direction in the first radiating part 113 and the second radiating part 123. This results in higher efficiency after the current in the first radiating part 113 and the second radiating part 123 are superimposed in the same direction.
[0079] In one embodiment, as shown in FIG6, the third slot 131 and the fourth slot 132 can be equivalent to distributed capacitance. The capacitance value at the third slot 131 and the fourth slot 132 can be adjusted by connecting a lumped capacitor in parallel. Specifically, the lumped capacitor can be matched according to parameters such as the slot width of the third slot 131 and the fourth slot 132. For example, a lumped capacitor with a capacitance value of 1.1pF can be connected in parallel at the third slot 131, and a lumped capacitor with a capacitance value of 2.2pF can be connected in parallel at the fourth slot 132. The feed section 2 is capacitor-fed, and the capacitance value of the capacitor-fed part is 1.5pF. FIG7 is a curve diagram of the S11 of the antenna structure provided in one embodiment of the present application. As shown in FIG7, in this embodiment, the antenna structure can excite three resonant points in the low frequency band, namely 0.718GHz, 0.88GHz and 1.01GHz. FIG8 is an efficiency curve diagram of the antenna structure provided in one embodiment of the present application. Curve a is the system efficiency curve and curve b is the radiation efficiency curve. As shown in Figure 8, at the 0.88 GHz resonant point, the currents on the first radiator 113 and the second radiator 123 are superimposed in the same direction, which allows the antenna structure system efficiency to reach its peak. That is, the system efficiency of the antenna structure at the frequency of 0.88 GHz is -3.86, which is a significant improvement in system efficiency compared to the antenna structures shown in Figures 2 and 3. Furthermore, the antenna structure resonates at the resonant points of 0.718 GHz and 1.01 GHz, which can extend the bandwidth of the antenna structure.
[0080] The aforementioned first frequency band can be a frequency band below 1 GHz. For example, the first frequency band can include a low-frequency (LB) band (698 MHz to 960 MHz), and the first radiating part 113 and the second radiating part 123 can resonate in the low-frequency LB band. The low-frequency LB band can have multiple resonant modes. Exemplarily, the multiple resonant modes can include a primary mode and a parasitic mode. The primary mode can have the highest efficiency, while the parasitic mode can improve efficiency and expand bandwidth. In some embodiments, the first frequency band can include the operating frequency band of a walkie-talkie, for example, 403 MHz to 470 MHz.
[0081] The antenna structure may include a first resonant mode, which may be the aforementioned main mode. In the first resonant mode, the current direction on the first radiating part 113 is the same as the current direction on the second radiating part 123. The efficiency of the first resonant mode can be improved by the superposition of the same-direction currents on the first radiating part 113 and the second radiating part 123.
[0082] The frequency band corresponding to the first resonant mode described above can be 698MHz to 960MHz. Within this frequency band, the superposition of the unidirectional currents on the first radiating part 113 and the second radiating part 123 can maximize the efficiency of the antenna structure, giving it good efficiency in the low-frequency (LB) band. In other embodiments, the first resonant mode can also be located in an even lower frequency band, such as the 403MHz to 470MHz band.
[0083] Figure 9 is a schematic diagram of an antenna structure provided in another embodiment of this application. As shown in Figure 9, the antenna structure also includes a first tuning unit 3, which is electrically connected to the third segment 13 near the third slot 131, for tuning the current distribution of the first radiating part 113. A feed unit 2 is electrically connected to the third segment 13 at a position between the fourth slot 132 and the second segment 12. In this embodiment, the current signal fed into the feed unit 2 can flow sequentially along the third segment 13 and the second segment 12 to the second radiating part 123. The first tuning unit 3 can guide the current signal, causing a portion of the current signal fed into the third segment 13 by the feed unit 2 to couple to the first radiating part 113 sequentially through the fourth slot 132 and the third slot 131, thereby enabling the first radiating part 113 and the second radiating part 123 to have a current distribution in the same direction, improving the efficiency of the antenna structure.
[0084] As shown in Figure 9, the antenna structure also includes a second tuning unit 4. The second tuning unit 4 is electrically connected to the second segment 12, or to a position on the third segment 13 near the fourth slit 132. The second tuning unit 4 is used to tune the current distribution of the second radiating part 123. In this embodiment, through the tuning effect of the second tuning unit 4, the current signal fed by the feed section 2 can flow sequentially along the third segment 13 and the second segment 12 to the second radiating part 123. At the same time, by cooperating with the first tuning unit 3, the antenna structure can switch between different operating frequency bands, and the first radiating part 113 and the second radiating part 123 can have the same current distribution, improving the efficiency of the antenna structure.
[0085] Figure 10 is a partial schematic diagram of an antenna structure provided in an embodiment of this application at the first tuning unit 3. The structure shown in Figure 10 corresponds to the structure at the location of the first tuning unit 3 in Figure 9. As shown in Figure 10, the first tuning unit 3 includes a first switching assembly 31 and a first electronic device 32. The first electronic device 32 is connected to the first switching assembly 31, and the first switching assembly 31 is connected to the portion of the third segment 13 located between the third slit 131 and the first segment 11. The first electronic device 32 may include a capacitor or an inductor, or a combination of capacitor and inductor. The first switching assembly 31 can be opened or closed to switch the first electronic device 32 connected to the antenna structure to match appropriate capacitance and / or inductance values, thereby enabling switching between different operating frequency bands.
[0086] As shown in Figure 10, the first tuning unit 3 may include a first branch 3a and a second branch 3b. The first switching assembly 31 includes a first switch 311 and a second switch 312. The first electronic device 32 includes a first inductor 321 and a second inductor 322. The first switch 311 and the first inductor 321 are both connected in series in the first branch 3a, and the second switch 312 and the second inductor 322 are both connected in series in the second branch 3b. The first branch 3a and the second branch 3b are connected in parallel and can be connected in series with the first capacitor 33. By controlling the closing or opening of the first switch 311 and the second switch 312, the first inductor 321 and / or the second inductor 322 can be selected to be connected in the antenna structure. In some other embodiments, the first capacitor 33 can also be replaced with other electronic devices, such as a combination of capacitor and inductor, which can exhibit capacitive behavior in the required frequency band.
[0087] Figure 11 is a partial schematic diagram of an antenna structure provided in one embodiment of this application at the second tuning unit 4. The structure shown in Figure 11 corresponds to the structure at the location of the second tuning unit 4 in Figure 9. As shown in Figure 11, the second tuning unit 4 includes a second switching assembly 41 and a second electronic device 42, which is connected to the second switching assembly 41. The second electronic device 42 may include a capacitor or an inductor, or a combination of capacitor and inductor. The second switching assembly 41 can be opened or closed to switch the second electronic device 42 connected to the antenna structure to match appropriate capacitance and / or inductance values, thereby enabling switching between different operating frequency bands.
[0088] As shown in Figure 11, the second tuning unit 4 may include a third branch 4a and a fourth branch 4b, the second switching assembly 41 includes a third switch 411 and a fourth switch 412, and the second electronic device 42 includes a third inductor 421 and a fourth inductor 422. The third switch 411 and the third inductor 421 are both connected in series in the third branch 4a, and the fourth switch 412 and the fourth inductor 422 are both connected in series in the fourth branch 4b. By controlling the closing or opening of the third switch 411 and the fourth switch 412, the third inductor 421 and / or the fourth inductor 422 can be selectively connected to the antenna structure.
[0089] In one embodiment, referring to Figures 10 and 11, the power supply section 2 is electrically connected to the position on the third segment 13 located between the fourth slit 132 and the second segment 12. The power supply section 2 can be connected in parallel with a 2.2nH inductor. The inductance value of the first inductor 321 can be 15nH, the inductance value of the second inductor 322 can be 1.5nH, the capacitance value of the first capacitor 33 can be 1pF, the inductance value of the third inductor 421 can be 15nH, and the inductance value of the fourth inductor 422 can be 9.1nH. The capacitance value at the fourth slit 132 can be 1.2pF. This 1.2pF can be achieved by connecting a lumped capacitor in series at the fourth slit 132, or by increasing the width of the third segment 13, making the fourth slit 132 equivalent to 1.2pF.
[0090] With the first switch 311, the second switch 312, the third switch 411, and the fourth switch 412 all turned on, the antenna structure operates in the B28 frequency band (703MHz~803MHz).
[0091] Closing the first switch 311 and opening the second switch 312 allows the first inductor 321 to be connected into the antenna structure, meaning the antenna structure has a 1pF capacitor in series and a 15nH inductor in parallel at the third slot 131. Simultaneously, closing the third switch 411 and opening the fourth switch 412 allows the third inductor 421 to be connected into the antenna structure, meaning the antenna structure has a 15nH inductor in parallel at the second segment 12. At this point, the antenna structure operates in the B5 frequency band (824MHz~894MHz).
[0092] Closing both the first switch 311 and the second switch 312 allows both the first inductor 321 and the second inductor 322 to be connected into the antenna structure. This means the antenna structure has a 1pF capacitor connected in series and a 15nH inductor and a 1.5nH inductor connected in parallel at the third slot 131. Simultaneously closing the third switch 411 and the fourth switch 412 allows both the third inductor 421 and the fourth inductor 422 to be connected into the antenna structure. This means the antenna structure has a 15nH inductor and a 9.1nH inductor connected in parallel at the second segment 12. At this point, the antenna structure operates in the B8 frequency band (880MHz~960MHz).
[0093] Therefore, by means of the first tuning unit 3 and the second tuning unit 4, the antenna structure can be switched between different operating frequency bands, and the currents of the first radiating part 113 and the second radiating part 123 can be superimposed in the same direction, thereby improving the antenna efficiency.
[0094] Figure 12 is an S11 curve diagram of an antenna structure provided in another embodiment of this application. The S11 curve diagram corresponds to the antenna structure shown in Figures 9 to 11. Curves c, d and e correspond to three resonant modes, respectively. The resonant frequency corresponding to curve c is 0.82 GHz, the resonant frequency corresponding to curve d is 0.72 GHz, and the resonant frequency corresponding to curve c is 0.92 GHz.
[0095] Figure 13 is an efficiency curve of an antenna structure provided in another embodiment of this application. This efficiency curve corresponds to the antenna structures shown in Figures 9 to 11. Curve f is the system efficiency curve of the antenna structure when it is not touched by hand in the resonant mode with a resonant point of 0.82 GHz. As shown in Figure 13, the system efficiency corresponding to curve f at a frequency of 0.82 GHz is -4.28 dB. Compared with the antenna structure shown in Figure 3, the antenna structure provided in this embodiment has better system efficiency, which is improved by nearly 0.5 dB.
[0096] Figure 14 is an efficiency curve of an antenna structure provided in another embodiment of this application. This efficiency curve corresponds to the antenna structures shown in Figures 9 to 11. Curve g is the hand-touch system efficiency curve when the antenna structure operates in the resonant mode with a resonant point of 0.82 GHz and the electronic device is touched. As shown in Figure 14, the hand-touch system efficiency corresponding to curve g at a frequency of 0.82 GHz is -4.21 dB. Compared with the antenna structure shown in Figure 3, the antenna structure provided in this embodiment has better hand-touch system efficiency, which is improved by nearly 2.2 dB.
[0097] Figure 15 is a schematic diagram of an antenna structure provided in another embodiment of this application. As shown in Figure 15, the antenna structure includes a feed section 2, a first tuning unit 3, and a second tuning unit 4. The feed section 2 is electrically connected to the second segment 12. The first tuning unit 3 is electrically connected to a position on the third segment 13 near the third slot 131. The second tuning unit 4 is electrically connected to a position on the third segment 13 near the fourth slot 132. The first tuning unit 3 is used to tune the current distribution of the first radiating part 113, and the second tuning unit 4 is used to tune the current distribution of the second radiating part 123. Through the first tuning unit 3 and the second tuning unit 4, the antenna structure can switch between different operating frequency bands, and the first radiating part 113 and the second radiating part 123 can have the same current distribution, improving the efficiency of the antenna structure.
[0098] Figure 16 is a partial schematic diagram of the antenna structure provided in another embodiment of this application at the first tuning unit 3. The structure shown in Figure 16 corresponds to the structure at the position of the first tuning unit 3 in Figure 15. As shown in Figure 16, the first tuning unit 3 includes a first branch 3a, a second branch 3b, a first switching assembly 31, and a first electronic device 32. The first switching assembly 31 includes a fifth switch 313 and a sixth switch 314. The first electronic device 32 includes a fifth inductor 323 and a sixth inductor 324. The fifth switch 313 and the fifth inductor 323 are both connected in series in the first branch 3a, and the sixth switch 314 and the sixth inductor 324 are both connected in series in the second branch 3b. The first branch 3a and the second branch 3b are connected in parallel and can be connected in series with the first capacitor 33. By controlling the closing or opening of the fifth switch 313 and the sixth switch 314, the fifth inductor 323 and / or the sixth inductor 324 can be selected to be connected in the antenna structure.
[0099] Figure 17 is a partial schematic diagram of the antenna structure provided in another embodiment of this application at the second tuning unit 4. The structure shown in Figure 17 corresponds to the structure at the position of the second tuning unit 4 in Figure 15. As shown in Figure 17, the second tuning unit 4 includes a third branch 4a, a fourth branch 4b, a second switching assembly 41, and a second electronic device 42. The second switching assembly 41 includes a seventh switch 413 and an eighth switch 414. The second electronic device 42 includes a seventh inductor 423 and a second capacitor 424. The seventh switch 413 and the seventh inductor 423 are both connected in series in the third branch 4a, and the eighth switch 414 and the second capacitor 424 are both connected in series in the fourth branch 4b. By controlling the closing or opening of the seventh switch 413 and the eighth switch 414, the seventh inductor 423 and / or the second capacitor 424 can be selected to be connected in the antenna structure.
[0100] In one embodiment, referring to Figures 10 and 11, the power supply section 2 is electrically connected to the second segment 12. The power supply section 2 can be connected in parallel with a 1.5nH inductor and a 1.5pF capacitor. In this embodiment, the power supply section 2 can be connected at the location of the second return point 122, while the grounding of the second return point 122 is cancelled. The 1.5nH inductor connected in parallel with the power supply section 2 is equivalent to grounding. The inductance value of the fifth inductor 323 can be 22nH, the inductance value of the sixth inductor 324 can be 27nH, the capacitance value of the first capacitor 33 can be 1pF, the inductance value of the seventh inductor 423 can be 8.2nH, and the capacitance value of the second capacitor 424 can be 1.8pF. The capacitance value at the fourth slot 132 can be adjusted by connecting a lumped capacitor in series. For example, the capacitance value can be adjusted to 1pF by connecting a third capacitor 43 in series at the fourth slot 132, or to 0.3pF by connecting a fourth capacitor 45 in series. The third capacitor 43 and the fourth capacitor 45 can be connected in parallel. The third capacitor 43 can be connected in series with the ninth switch 44, and the fourth capacitor 45 can be connected in series with the tenth switch 46. By controlling the ninth switch 44 or the tenth switch 46, the third capacitor 43 or the fourth capacitor 45 can be selected to be connected to the antenna structure.
[0101] The fifth switch 313 and the sixth switch 314 are both opened. A first capacitor 33 of 1pF is connected in series at the third slit 131. At the same time, the eighth switch 414 and the ninth switch 44 are closed, and the seventh switch 413 and the tenth switch 46 are opened. A third capacitor 43 of 1pF is connected in series at the fourth slit 132 and a second capacitor 424 of 1.8pF is connected in parallel. At this time, the antenna structure operates in the B28 frequency band.
[0102] Closing the fifth switch 313 and opening the sixth switch 314 allows the fifth inductor 323 to be connected to the antenna structure, meaning the antenna structure has a 1pF capacitor in series and a 22nH inductor in parallel at the third slot 131. Simultaneously, opening the seventh switch 413, the eighth switch 414, and the tenth switch 46, and closing the ninth switch 44, allows the third capacitor 43 to be connected to the antenna structure, meaning a 1pF capacitor in series at the fourth slot 132. At this point, the antenna structure operates in the B5 frequency band.
[0103] Closing both the fifth switch 313 and the sixth switch 314 allows both the fifth inductor 323 and the sixth inductor 324 to be connected into the antenna structure. This means the antenna structure has a 1pF capacitor connected in series and a 22nH inductor and a 27nH inductor connected in parallel at the third slot 131. Simultaneously, opening the eighth switch 414 and the ninth switch 44, and closing the seventh switch 413 and the tenth switch 46, allows both the seventh inductor 423 and the fourth capacitor 45 to be connected into the antenna structure. This means the antenna structure has a 0.3pF capacitor connected in series and an 8.2nH inductor connected in parallel at the fourth slot 132. At this point, the antenna structure operates in the B8 frequency band.
[0104] Figure 18 is an S11 curve diagram of an antenna structure provided in another embodiment of this application. The S11 curve diagram corresponds to the antenna structure shown in Figures 15 to 17. Curves h, i and j correspond to three resonant modes, respectively. The resonant frequency of curve i is 0.83 GHz, the resonant frequency of curve h is 0.74 GHz, and the resonant frequency of curve j is 0.91 GHz.
[0105] Figure 19 is an efficiency curve of an antenna structure provided in another embodiment of this application. This efficiency curve corresponds to the antenna structures shown in Figures 15 to 17. Curve k is the system efficiency curve of the antenna structure when it is not touched by hand in the resonant mode with a resonant point of 0.83 GHz. As shown in Figure 19, the system efficiency corresponding to curve k at a frequency of 0.83 GHz is -4.37 dB. Compared with the antenna structure shown in Figure 3, the antenna structure provided in this embodiment has better system efficiency, which is improved by nearly 0.4 dB, and the bandwidth is significantly improved.
[0106] Figure 20 is a schematic diagram of an antenna structure provided in another embodiment of this application. As shown in Figure 20, the antenna structure includes a feed section 2, a first tuning unit 3, and a second tuning unit 4. The feed section 2 is electrically connected to the third segment 13 and is located between the fourth slot 132 and the second segment 12, and close to the fourth slot 132. The first tuning unit 3 is connected to the third segment 13 and close to the third slot 131, and the second tuning unit 4 is connected to the fourth segment and close to the fourth slot 132. The antenna structure also includes a third tuning unit 5, which is connected to the second return point 122 and is used to tune the current distribution of the second radiating part 123. Through the cooperation of the first tuning unit 3, the second tuning unit 4, and the third tuning unit 5, the antenna structure can switch between different operating frequency bands.
[0107] Figure 21 is a partial schematic diagram of the antenna structure provided in another embodiment of this application at the first tuning unit 3. The structure shown in Figure 21 corresponds to the structure at the position of the first tuning unit 3 in Figure 20. As shown in Figure 21, the first tuning unit 3 includes an eleventh switch 315 and an eighth inductor 325, which are connected in series. The first tuning unit 3 also includes a fifth capacitor 34, and the two ends of the third slot 131 are connected in series through the fifth capacitor 34, and simultaneously connected in parallel with the branch where the eighth inductor 325 is located.
[0108] Figure 22 is a partial schematic diagram of the antenna structure provided in another embodiment of this application at the second tuning unit 4. The structure shown in Figure 22 corresponds to the structure at the position of the second tuning unit 4 in Figure 20. As shown in Figure 22, the second tuning unit 4 includes a fifth branch 4c, a sixth branch 4d, a second switch assembly 41, and a second electronic device 42. The second switch assembly 41 includes a twelfth switch 415 and a thirteenth switch 416. The second electronic device 42 includes a sixth capacitor 425 and a seventh capacitor 426. The twelfth switch 415 and the sixth capacitor 425 are both connected in series in the fifth branch 4c, and the thirteenth switch 416 and the seventh capacitor 426 are both connected in series in the sixth branch 4d. The two ends of the fourth slot 132 are connected in series through the fifth branch 4c or the sixth branch 4d, and the fifth branch 4c and the sixth branch 4d are connected in parallel. By controlling the closing or opening of the twelfth switch 415 and the thirteenth switch 416, the sixth capacitor 425 and / or the seventh capacitor 426 can be selected to be connected to the antenna structure.
[0109] As shown in Figure 22, the third tuning unit 5 may include a seventh branch 5a, an eighth branch 5b, and a ninth branch 5c connected in parallel. The third tuning unit 5 also includes a third switching assembly 51 and a third electronic device 52. The third electronic device 52 is connected to the third switching assembly 51, and the third switching assembly 51 is connected to the second return point 122. The third electronic device 52 may include a capacitor or an inductor, or a combination of capacitors and inductors. The third switching assembly 51 can be opened or closed to switch the third electronic device 52 connected to the antenna structure to match appropriate capacitance and / or inductance values, thereby enabling switching between different operating frequency bands.
[0110] As shown in Figure 22, the third switching assembly 51 includes a fourteenth switch 511, a fifteenth switch 512, and a sixteenth switch 513. The third electronic device 52 includes a ninth inductor 521 and a tenth inductor 522. The fourteenth switch 511 and the ninth inductor 521 are connected in series in the seventh branch 5a, the fifteenth switch 512 and the tenth inductor 522 are connected in series in the eighth branch 5b, and the sixteenth switch 513 is connected in series in the ninth branch 5c. Notably, no inductor is connected in series in the ninth branch 5c; that is, the ninth branch 5c can be equivalent to 0nH.
[0111] In one embodiment, referring to Figures 21 and 22, the power supply section 2 is connected in series with a 1.5pF capacitor. The inductance value of the eighth inductor 325 can be 10nH, the capacitance value of the fifth capacitor 34 can be 1pF, the capacitance value of the sixth capacitor 425 can be 1pF, the capacitance value of the seventh capacitor 426 can be 0.3pF, the inductance value of the ninth inductor 521 can be 1nH, and the inductance value of the tenth inductor 522 can be 1nH.
[0112] Open the eleventh switch 315, and the two ends of the third slot 131 can be connected in series with the fifth capacitor 34 (1pF). Close the twelfth switch 415 and open the thirteenth switch 416, and the two ends of the fourth slot 132 can be connected in series with the sixth capacitor 425 (1pF). Close the fourteenth switch 511 and open the fifteenth and sixteenth switches 513, so that the ninth inductor 521 (1nH) can be connected in parallel at the second return point 122 of the second segment 12. At this time, the antenna structure operates in the B28 frequency band.
[0113] Open the eleventh switch 315, and the two ends of the third slot 131 can be connected in series with the fifth capacitor 34 (1pF). Close the twelfth switch 415 and open the thirteenth switch 416, and the two ends of the fourth slot 132 can be connected in series with the sixth capacitor 425 (1pF). Close the fourteenth and fifteenth switches 512 and open the sixteenth switch 513, so that the ninth inductor 521 (1nH) and the tenth inductor 522 (1nH) can be connected in parallel at the second return point 122 of the second segment 12. At this time, the antenna structure operates in the B5 frequency band.
[0114] Closing the eleventh switch 315 allows the two ends of the third slot 131 to be connected in series with the fifth capacitor 34 (1pF) and in parallel with the eighth inductor 325 (10nH). Opening the twelfth switch 415 and closing the thirteenth switch 416 allows the two ends of the fourth slot 132 to be connected in series with the seventh capacitor 426 (0.3pF). Closing the fourteenth, fifteenth, and sixteenth switches 513 allows the second segment 12 to be connected in parallel with the ninth inductor 521 (1nH), the tenth inductor 522 (1nH), and the ninth branch 5c (equivalent to 0nH inductance). At this point, the antenna structure operates in the B8 frequency band.
[0115] Figure 23 is an S11 curve diagram of an antenna structure provided in another embodiment of this application. The S11 curve diagram corresponds to the antenna structure shown in Figures 20 to 22. Curves m, n and p correspond to three resonant modes, respectively. The resonant frequency of curve n is 0.84 GHz, the resonant frequency of curve m is 0.76 GHz, and the resonant frequency of curve p is 0.92 GHz.
[0116] Figure 24 is an efficiency curve of an antenna structure provided in another embodiment of this application. This efficiency curve corresponds to the antenna structures shown in Figures 20 to 22. Curve q is the system efficiency curve of the antenna structure operating at a resonant point of 0.76 GHz. As shown in Figure 24, the system efficiency corresponding to curve q at a frequency of 0.76 GHz is -3.92 dB. Compared with the antenna structure shown in Figure 3, the antenna structure provided in this embodiment has better system efficiency in the B28 band, with a system efficiency improvement of nearly 0.4 dB and a significant improvement in bandwidth.
[0117] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An antenna structure, characterized in that, Includes a metal frame and a power supply unit; The metal frame includes a first section, a second section, and a third section, with the two ends of the third section connected to the first section and the second section, respectively. The first segment has a first seam, the second segment has a second seam, and the third segment has a third seam and a fourth seam, wherein the third seam is located between the first segment and the fourth seam, and the fourth seam is located between the second segment and the third seam; The first segment is provided with a first return point, and the portion of the first segment located between the first slit and the first return point forms a first radiating part; The second segment is provided with a second return point, and the portion of the second segment located between the second slit and the second return point forms a second radial section; The power supply section is electrically connected to any one of the first segment, the second segment, or the third segment, wherein the power supply section is used to power the first radiating section and the second radiating section, so that the first radiating section and the second radiating section resonate in the first frequency band.
2. The antenna structure according to claim 1, characterized in that, The antenna structure includes a first resonant mode, in which the current direction on the first radiating part is the same as the current direction on the second radiating part.
3. The antenna structure according to claim 2, characterized in that, The frequency band corresponding to the first resonant mode is 698MHz to 960MHz.
4. The antenna structure according to any one of claims 1-3, characterized in that, It also includes a first tuning unit, which is electrically connected to a position on the third segment near the third slit, for tuning the current distribution of the first radiating part.
5. The antenna structure according to claim 4, characterized in that, The first tuning unit includes a first switching assembly and a first electronic device, the first electronic device being connected to the first switching assembly.
6. The antenna structure according to any one of claims 1-5, characterized in that, It also includes a second tuning unit, which is electrically connected to the second segment or the third segment, for tuning the current distribution of the second radiating part.
7. The antenna structure according to claim 6, characterized in that, The second tuning unit includes a second switching assembly and a second electronic device, the second electronic device being connected to the second switching assembly.
8. The antenna structure according to any one of claims 1-7, characterized in that, It also includes a third tuning unit, which is connected to the second return point and is used to tune the current distribution of the second radiating part.
9. The antenna structure according to claim 8, characterized in that, The third tuning unit includes a third switching assembly and a third electronic device, the third electronic device being connected to the third switching assembly, and the third switching assembly being connected to the second return point.
10. The antenna structure according to any one of claims 1-9, characterized in that, The metal frame is the border of the electronic device. The first segment is disposed on the first side of the electronic device, the second segment is disposed on the second side of the electronic device, and the third segment is disposed on the third side of the electronic device. The first side and the second side are two sides adjacent to the third side.
11. The antenna structure according to any one of claims 1-10, characterized in that, The widths of the first seam, the second seam, the third seam, and the fourth seam are between 0.2 mm and 1.5 mm.
12. An electronic device, characterized in that, Includes the antenna structure described in any one of claims 1-11.
13. The electronic device according to claim 12, characterized in that, The electronic device is a foldable electronic device.
14. The electronic device according to claim 13, characterized in that, The electronic device includes a first body, a second body, and a rotating shaft. The first body and the second body are located on both sides of the rotating shaft and are rotatably connected to the rotating shaft. The antenna structure is disposed on the first body or the second body.