An electronic device

Abstract

This application discloses an electronic device comprising: a first frame, a second frame, and a third frame arranged sequentially; a first gap exists between the first frame and the second frame, and a second gap exists between the second frame and the third frame; wherein at least a portion of the first frame forms a first radiator of an antenna structure of the electronic device, and the second frame forms a second radiator of the antenna structure; the second radiator has a first feed point and a first ground point; the first feed point is disposed close to the second gap relative to the first ground point, and the first feed point is connected to a first feed source; the first ground point is located in the middle portion of the second radiator; the first radiator has a second ground point and a third ground point, the second ground point is connected to a first switch, and the third ground point is disposed away from the first gap relative to the second ground point.

Description

Technical Field

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

[0002] With the development and wider application of mobile terminals, various fields have increasingly higher requirements for the communication performance of terminals. In current technology, a single slot is usually made in the entire frame of the terminal to serve as the antenna for cellular communication. Under this design, the antenna mode design of the cellular frequency band is limited, and only the inverted-F antenna (IFA) mode or IFA and parasitic mode can be implemented. Summary of the Invention

[0003] The purpose of this application is to provide an electronic device that solves the problem of limited antenna modes caused by the current antenna structure design of electronic devices.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, embodiments of this application provide an electronic device, including:

[0006] A first frame, a second frame, and a third frame are arranged sequentially; there is a first gap between the first frame and the second frame, and a second gap between the second frame and the third frame;

[0007] Wherein, at least a portion of the first frame is formed as a first radiator of the antenna structure of the electronic device, and the second frame is formed as a second radiator of the antenna structure;

[0008] The second radiator has a first feed point and a first ground point; the first feed point is located close to the second gap relative to the first ground point, and the first feed point is connected to the first feed source; the first ground point is located in the middle part of the second radiator;

[0009] The first radiator has a second grounding point and a third grounding point. The second grounding point is connected to the first switch, and the third grounding point is located away from the first gap relative to the second grounding point.

[0010] In the embodiments of this application, the first frame of the electronic device is formed as the first radiator of the antenna structure, and the second frame is formed as the second radiator of the antenna structure. There is a first gap between the first frame and the second frame, and a second gap between the second frame and the third frame. A first grounding point is disposed in the middle part of the second radiator, and a first feed point is disposed near the second gap. By setting the gap, the grounding point and the feed point, the antenna structure can realize T-shaped antenna mode and parasitic antenna mode, increasing the working modes of the cellular antenna. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0012] Figure 1 This is one of the schematic diagrams of an electronic device according to an embodiment of this application;

[0013] Figure 2 This is a second schematic diagram of an electronic device according to an embodiment of this application;

[0014] Figure 3 This is a schematic diagram of the current flow in the cellular communication mode according to an embodiment of this application;

[0015] Figure 4 This is the third schematic diagram of the electronic device according to an embodiment of this application;

[0016] Figure 5 This is a schematic diagram of the current flow in NFC mode according to an embodiment of this application;

[0017] Figure 6 This is one of the structural schematic diagrams of the matching circuit in an embodiment of this application;

[0018] Figure 7 This is a second schematic diagram of the matching circuit in an embodiment of this application;

[0019] Figure 8 This is a schematic diagram of the current flow direction in the GPS-L5 frequency band according to an embodiment of this application;

[0020] Figure 9 and Figure 10 This is a schematic diagram comparing the radiation efficiency of the antenna structure of the electronic device of this application with that of a conventional antenna;

[0021] Figure 11 This is a standing wave diagram of three excitation modes in the embodiments of this application;

[0022] Figure 12 This is a schematic diagram of the current flow direction of various antenna modes according to embodiments of this application;

[0023] Figure 13 This is a standing wave diagram of four excitation modes in the embodiments of this application.

[0024] Reference numerals: 1. First radiator; 2. Second radiator; 3. First gap; 4. First frame; 5. Second frame; 6. Third frame; 7. Second gap; 8. Matching circuit; 9. Second feed point; 11. Second ground point; 12. First switch; 13. Third ground point; 21. First feed point; 22. First ground point; 23. SAR sensor; 81. First inductor; 82. Third capacitor; 83. First series circuit; 84. Fifth capacitor; 85. Second series circuit; 91. Third feed source; 61. Fourth ground point; 62. Third radiator; 121. Second capacitor; 211. First feed source; 221. First capacitor; 222. Second feed source; 831. Fourth capacitor; 832. Second inductor; 851. Sixth capacitor; 852. Third inductor. Detailed Implementation

[0025] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The electronic device according to embodiments of this application is described below with reference to the accompanying drawings.

[0030] like Figures 1 to 13 As shown, this application embodiment provides an electronic device, including: a first frame 4, a second frame 5, and a third frame 6 arranged sequentially; a first gap 3 is provided between the first frame 4 and the second frame 5, and a second gap 7 is provided between the second frame 5 and the third frame 6; wherein at least a portion of the first frame 4 is formed as a first radiator 1 of an antenna structure of the electronic device, and the second frame 5 is formed as a second radiator 2 of the antenna structure;

[0031] The second radiator 2 has a first feed point 21 and a first ground point 22; the first feed point 21 is located close to the second gap 7 relative to the first ground point 22, and the first feed point 21 is connected to the first feed source 211; the first ground point 22 is located in the middle part of the second radiator 2.

[0032] The first radiator 1 has a second grounding point 11 and a third grounding point 13. The second grounding point 11 is connected to the first switch 12, and the third grounding point 13 is positioned away from the first gap 3 relative to the second grounding point 11. The antenna structure operates in cellular communication modes, such as the MHB band and the NR band of cellular communication.

[0033] In this embodiment, such as Figure 1 As shown, the electronic device includes a first frame 4, a second frame 5, and a third frame 6. A first gap 3 exists between the first frame 4 and the second frame 5; a second gap 7 exists between the second frame 5 and the third frame 6; at least a portion of the first frame 4 is formed as a first radiator 1 of an antenna structure, and the second frame 5 is formed as a second radiator 2 of an antenna structure. The second frame 5 may be a frame located at the top corner of the electronic device.

[0034] like Figure 2As shown, the second radiator 2 has a first feed point 21 and a first ground point 22. The first feed point 21 can be understood as a feed point used to realize cellular communication. The first feed point 21 is located between the first ground point 22 and the second gap 7, so that the first feed point 21 is close to the second gap 7, thereby increasing the distance between the first feed point 21 and the first ground point 22, thereby increasing the equivalent inductance of the communication path between the first feed point 21 and the first ground point 22, so that the antenna structure can achieve better radiation effect in cellular communication mode.

[0035] Optionally, the distance between the first feed point 21 and the second gap 7 is less than or equal to one-quarter wavelength of the mid-high frequency band. As an optional embodiment, the distance between the first feed point 21 and the second gap 7 is less than or equal to one-quarter wavelength of the NR communication band. Optionally, the specific value of the distance between the first feed point 21 and the second gap 7 can be related to the initial impedance of the mid-high frequency band (MHB). For example, the more convergent the initial impedance of the mid-high frequency band (MHB), the smaller the distance between the first feed point 21 and the second gap 7 can be set, thereby ensuring that the distance between the first feed point 21 and the first ground point 22 is larger, so that the equivalent inductance of the communication path between the first feed point 21 and the first ground point 22 is larger, thereby enabling the antenna structure to achieve better radiation performance in cellular communication mode.

[0036] The first grounding point 22 is located in the middle part of the second radiator 2. This middle part can be understood as the preset range of the center point of the second radiator 2. Optionally, the first grounding point 22 is located at the center point of the second radiator 2. In this case, the grounding wire of the second radiator 2 and the first grounding point 22 form a T-shaped antenna. This T-shaped antenna can realize common mode (CM) excitation mode and differential mode (DM) excitation mode, where the current flow direction corresponding to the CM excitation mode and the DM excitation mode is as follows: Figure 3 As shown, the first grounding point 22 of the T-shaped antenna is the return current path for the CM mode in the MHB band of cellular communication.

[0037] The first radiator 1 has a second grounding point 11 and a third grounding point 13. The second grounding point 11 is connected to a first switch 12, which can be understood as a grounding switch. At this time, the part of the radiator between the second grounding point 11 and the first gap 3 forms a parasitic antenna. This parasitic antenna can realize the slot common mode (SLOT CM) excitation mode. The current flow direction corresponding to the SLOT CM excitation mode is as follows: Figure 3 As shown, in Figure 3J1 is used in this context. Optionally, the distance between the second grounding point 11 and the first gap 3 can be set to be greater than or equal to 5 mm, thereby exciting a better SLOT CM. The electrical length adjusted by the first switch 12 is less than or equal to 1 / 4 wavelength of MHB. For example, according to the required MHB operating frequency band, the antenna is adjusted to the corresponding frequency band by adjusting the first switch 12. For example, if MHB operates in the B1 band, different matching values ​​of the SLOT CM are excited by switching the first switch 12 on and off, generating a mode higher than B1, i.e., the electrical length is less than or equal to 1 / 4 wavelength of B1, thereby obtaining the optimal radiation efficiency.

[0038] In this embodiment, the first frame of the electronic device is formed as the first radiator of the antenna structure, and the second frame is formed as the second radiator of the antenna structure. There is a first gap between the first frame and the second frame, and a second gap between the second frame and the third frame. The first grounding point is located in the middle part of the second radiator, and the first feed point is located near the second gap. By setting the gap, the grounding point and the feed point, the antenna structure can realize the T-shaped antenna mode and the parasitic antenna mode, which increases the working mode of the cellular antenna.

[0039] In some embodiments, such as Figure 4 As shown, the electronic device further includes a matching circuit 8 connected between the first end and the second end of the first gap 3;

[0040] The first grounding point 22 is grounded through the first capacitor 221;

[0041] A second feed source 222 is also connected to the first grounding point 22;

[0042] The antenna structure operates in two modes: cellular communication mode and near field communication (NFC) mode.

[0043] In this embodiment, matching circuits 8 are cascaded at both ends of the first gap 3, and the first grounding point 22 is grounded through a first capacitor 221 with a relatively large value. Specifically, the value of the first capacitor 221 can be designed according to the NFC impedance requirements. Optionally, the value of the first capacitor 221 is related to the length of the NFC communication path. The longer the NFC communication path, the smaller the value of the first capacitor 221, ensuring isolation between the NFC communication signal and the cellular communication signal. Optionally, in one embodiment, the value of the first capacitor 221 can be 680pF or 680±ApF, where the value of A can be set according to the actual needs of NFC communication.

[0044] Furthermore, a second feed source 222 is connected to the first grounding point 22, meaning the second feed source 222 is connected in parallel with the grounding path of the first capacitor 221. This second feed source 222 is the feed source for NFC communication mode, so the first grounding point 22 can also be understood as the power supply point for NFC communication mode. The matching circuit 8 from the first grounding point 22 to the first gap 3, and the matching circuit 8 to the third grounding point 13, can serve as effective paths for NFC communication. The current flow direction for NFC communication is as follows... Figure 5 As shown.

[0045] Optionally, a second capacitor 121 is provided between the second grounding point 11 and the first switch 12 to ensure that the NFC communication signal will not return to ground through the second grounding point 11.

[0046] In this embodiment, by cascading matching circuits 8 at both ends of the first gap 3, a closed-loop design for NFC is completed, which increases the effective path of NFC and achieves compatibility between NFC communication and cellular communication modes. Optionally, the total length from the first grounding point 22 to the third grounding point 13 can be set to be greater than or equal to 40mm. By increasing the NFC communication path, better NFC communication performance can be ensured by the antenna structure. Optionally, to save internal space of the electronic device, the length of the NFC communication path can be set based on the voltage of the NFC chip; the higher the voltage of the NFC chip, the shorter the length of this part can be.

[0047] In this embodiment, the second feed source 222 is connected to the first grounding point 22. The NFC is directly fed from the first grounding point 22. By introducing the first capacitor 221 at the first grounding point 22, the current of cellular communication, such as MHB, returns to ground through the first capacitor 221 and will not enter the NFC power supply path. This achieves isolation between NFC and cellular signals and does not change the mode distribution of cellular communication (including CM, DM and SLOT CM modes).

[0048] Compared to the traditional solution that isolates NFC and cellular communication signals by connecting an inductor in series in the NFC power supply path, this embodiment of the application does not require an inductor in the NFC power supply path, i.e., there is no inductor in the NFC power supply path. This achieves isolation between NFC and cellular communication signals. Since the NFC current is fed into the NFC communication path from the return point of the cellular antenna (i.e., the first grounding point 22), and the current of the cellular antenna does not enter the NFC power supply path, direct isolation between NFC and cellular signals is achieved, which can reduce path loss and keep the MHB mode unchanged.

[0049] In some embodiments, the first radiator 1 further has a second feed point 9, which is connected to the third feed source 91; the second feed point 9 is located between the second ground point 11 and the third ground point 13; wherein, the working modes of the antenna structure include: cellular communication mode, near field communication (NFC) mode and global positioning system (GPS) communication mode.

[0050] In this embodiment, such as Figure 1 As shown, the first radiator 1 has a second feed point 9, which can serve as the feed point for the GPS-L5 frequency band. The portion between the third grounding point 13 and the first gap 3 can then be an effective path for the GPS-L5 frequency band. In this case, the portion between the third grounding point 13 and the first gap 3 forms an IFA antenna. The current flow direction of the GPS-L5 frequency band is as follows... Figure 8 As shown, since the first grounding point 22 is grounded through the first capacitor 221, the signal current of the GPS-L5 band will return to ground through the first capacitor 221 and will not enter the NFC power supply path. Therefore, there is also good isolation between the NFC communication signal and the GPS-L5 band signal. In addition, by cascading the matching circuit 8 at the first gap 3, the capacitive connection between the GPS-L5 band and the cellular MHB band is realized.

[0051] Optionally, the distance between the second feed point 9 and the third ground point 13 is greater than or equal to one-tenth of the wavelength of the frequency band corresponding to the GPS communication mode. This can reduce the size of the parallel capacitor in the GPS feed point matching circuit, thereby reducing path loss. It should be noted that the embodiments of this application do not limit the specific form of the GPS feed point matching circuit.

[0052] In some embodiments, the matching circuit 8 includes a first matching circuit, which is used to enable the antenna structure to radiate in the operating frequency band of NFC mode and the mid-to-high frequency band (MHB) of cellular communication mode.

[0053] Optionally, the first matching circuit includes: a first inductor 81;

[0054] or,

[0055] The first matching circuit includes: a first inductor 81, a third capacitor 82 connected in parallel with the first inductor 81, and a first series circuit 83 connected in parallel with the first inductor 81. The first series circuit 83 includes a fourth capacitor 831 and a second inductor 832 connected in series.

[0056] In this embodiment, the matching circuit 8 includes a first matching circuit, which enables the coexistence of NFC mode and cellular communication mode. For example, the matching circuit 8 may only include... Figure 6 The first inductor 81 is used in the matching circuit. Optionally, if the size of the NFC path is sufficient or the frequency range is reduced, the matching circuit 8 may only have the first inductor. The value of the first inductor 81 can be set as needed, for example, the value of the first inductor 81 can be in the range of 10 nH to 68 nH, such as setting the value of the first inductor 81 to 27 nH.

[0057] Alternatively, the matching circuit 8 includes Figure 6 The parallel circuit shown allows for the direct transmission of NFC signals through the first inductor 81 at the first gap 3. The third capacitor 82 is connected in parallel with the first inductor 81; the first series circuit 83 is connected in parallel with both the first inductor 81 and the third capacitor 82. In this design, the parallel circuit formed by the third capacitor 82 and the first series circuit 83 is equivalent to a 0.1pF-0.3pF capacitor. For example, for the MHB band of cellular communication, this parallel circuit is equivalent to a 0.1pF-0.3pF capacitor; for the GPS-L5 band, it is equivalent to a 0.3pF capacitor. This achieves compatibility of the antenna structure with GPS communication mode, NFC communication mode, and cellular communication mode.

[0058] It should be noted that the values ​​of each component in the first matching circuit can be set according to actual needs. For example, if it is necessary to ensure that the capacitance is equivalent to 0.1pF-0.3pF for the MHB band of cellular communication and 0.3pF for the GPS-L5 band, then the third capacitor 82, the fourth capacitor 831, and the second inductor 832 can meet this requirement. For example, the value of the third capacitor 82 can be set to 0.25pF (±0.XpF), the value of the fourth capacitor 831 to 0.15pF (±0.XpF), and the value of the second inductor 832 to 82 nH (±YnH).

[0059] In this embodiment, the first gap 3 conforms to the mechanism of a planar capacitor, typically with a capacitance value within 0.3pF. Through the design of the cascaded matching circuit 8, the equivalent loading of GPS-L5 band and MHB is within 0.3pF, which is comparable to the equivalent capacitance of the first gap 3. This design achieves compatibility with cellular communication mode, NFC mode, and GPS communication mode.

[0060] In some embodiments, such as Figure 1 As shown, a SAR sensor 23 is connected to the second radiator 2;

[0061] The matching circuit 8 includes a second matching circuit, which is used to enable the antenna structure to radiate in the operating frequency band of NFC mode and the MHB frequency band of cellular communication mode, and coexists with the SAR sensor 23.

[0062] In this embodiment, to implement the SAR sensor function, a SAR sensor 23 can be connected to the second radiator 2. To ensure compatibility between NFC mode, cellular communication mode, and SAR sensor function, a second matching circuit is designed. Optionally, the second matching circuit includes a fifth capacitor 84 and a second series circuit 85 connected in parallel with the fifth capacitor 84. The second series circuit 85 includes a sixth capacitor 851 and a third inductor 852 connected in series. The antenna structure operates in cellular communication mode, NFC mode, and Synthetic Aperture Radar (SAR) sensor mode.

[0063] In this embodiment, the matching circuit 8 can also be as follows: Figure 7 As shown, the matching circuit 8 is equivalent to an inductor in the NFC operating frequency band of 13.56MHz and a 560pF capacitor in the SAR sensor operating frequency band before 100Hz. This enables the second radiator 2 to levitate above the ground, achieving a coexistence design between NFC communication mode and SAR sensor (sensor) function. This design achieves compatibility with cellular communication mode, NFC communication mode, GPS communication mode, and SAR sensor function.

[0064] It should be noted that the values ​​of each component in the second matching circuit can be set according to actual needs. For example, if it is necessary to ensure compatibility between NFC, cellular communication, and SAR sensor functions, then the values ​​of the fifth capacitor 84, the sixth capacitor 851, and the third inductor 852 can meet this requirement. For example, the value of the fifth capacitor 84 can be set to 0.15 pF (±0.X pF); the value of the sixth capacitor 851 to 560 pF (±Y pF); and the value of the third inductor 852 to 270 nH (±ZnH). With the 560 pF sixth capacitor 851 and the 270 nH third inductor 852 resonating in series at 12.9 MHz, the matching circuit can be equivalent to an inductor in the NFC operating frequency band of 13.56 MHz and equivalent to a 560 pF capacitor in the SAR sensor operating frequency band before 100 Hz.

[0065] Optionally, to ensure the sensitivity of the SAR sensor, the capacitor connected in the sensor path can be set to within 600pF. In this case, the optimal matching circuit design for NFC mode can utilize a 5600pF capacitor in series with a 27nH inductor. The structure of matching circuit 8 is then similar to... Figure 7 The same, except that the value of the sixth capacitor 851 is set to 5600 pF and the value of the third inductor 852 is set to 27 nH.

[0066] The electronic device of this application can be as follows: Figure 1As shown, the antenna structure of this electronic device is compatible with cellular communication mode, NFC mode, GPS communication mode, and SAR sensor function. The cellular communication mode can implement T-shaped antenna mode and parasitic antenna mode, including three modes: SM, DM, and SLOT CM. The effective paths for cellular communication include: the path for CM mode (the path from the first feed point 21 to the first ground point 22, the path from the first ground point 22 to the first gap 3, and the path from the first ground point 22 to the ground of the first capacitor 221); the path for DM mode (the path from the first feed point 21 to the first ground point 22 to the first gap 3); and the path for SLOT CM mode (the path between the second ground point 11 and the first gap 3). The effective paths for NFC mode include: the path from the first ground point 22 to the first gap 3, the matching circuit 8, and the path from the first gap 3 to the third ground point 13. The effective paths for GPS communication mode include: the path between the first gap 3 and the third ground point 13. The current flow directions for each communication mode are as follows: Figure 8 As shown.

[0067] The radiation efficiency of the antenna structure of the electronic device in this application is compared with that of a conventional antenna as follows: Figure 9 and Figure 10 As shown, the standing wave diagrams for the three excitation modes implemented by the antenna structure of this application in cellular communication mode are as follows: Figure 11 As shown. Compared to before adding the NFC mode, the radiation efficiency of the entire MHB band is almost the same after adding the NFC mode. The radiation efficiency of the N78 band decreases by about 0.2dB, and the radiation efficiency of the GPS-L5 band decreases by about 0.5dB. Therefore, the impact of adding the NFC mode on other communication frequency bands is small.

[0068] In some embodiments, the third frame 6 has a fourth grounding point 61, and the portion between the second slit 7 and the fourth grounding point 61 forms the third radiator 62 of the antenna structure.

[0069] In this embodiment, such as Figure 1 As shown, a fourth grounding point 61 is provided on the third frame 6 of the electronic device. The path between the fourth grounding point 61 and the second gap 7 forms a third radiator 62. This third radiator 62 forms a parasitic antenna, which can realize another SLOT CM excitation mode. The current flow direction corresponding to this SLOT CM excitation mode is as follows: Figure 12 As shown, the current flow direction of this SLOT CM excitation mode is in Figure 12 J2 is used in this embodiment. This embodiment further extends the bandwidth of the cellular communication mode by adding a third radiator 62. Figure 1The antenna structure shown can implement four cellular communication modes: CM, DM, first SLOT CM, and second SLOT CM. The path corresponding to the first SLOT CM mode includes the path between the second grounding point 11 and the first gap 3. The path corresponding to the second SLOT CM mode includes the path between the fourth grounding point 61 and the second gap 7. The standing wave diagrams of the four excitation modes implemented by the antenna structure in this application under cellular communication modes are shown below. Figure 13 As shown.

[0070] The antenna structure of this application embodiment, by adding a first slit 3, realizes the design of T-shaped antenna mode and parasitic antenna mode with increased MHB. In the T-shaped antenna mode, the CM excitation mode preferably operates at 1.6 GHz, and the DM excitation mode preferably operates at 2.7 GHz. The SLOT CM excitation mode can be adjusted according to the required MHB operating frequency band using a first switch, thereby obtaining the optimal radiation efficiency.

[0071] By setting the first capacitor 221 and allowing NFC to be directly fed from the first ground point 22, the inductor in the NFC feed path in the traditional antenna design is eliminated, which can reduce path loss. The NFC signal is fed from the return point of the cellular antenna, realizing direct isolation between NFC and cellular communication mode. That is, the current of the cellular antenna will not enter the NFC feed path. The MHB and L5 frequency band paths are usually connected in series with a small capacitor, which can achieve the effect of high pass and low impedance, realizing low frequency isolation of NFC.

[0072] By cascading the matching circuit 8 at the location of the first break, the NFC communication path can be directly connected through the inductor, while the MHB and L5 bands can be connected across capacitors, thus completing the NFC closed-loop design and the extremely low-loss design of the cellular antenna.

[0073] In this embodiment, the first frame of the electronic device is formed as the first radiator of the antenna structure, and the second frame is formed as the second radiator of the antenna structure. A first gap exists between the first and second frames, and a second gap exists between the second radiator and the third frame. A first grounding point is located in the middle portion of the second radiator, and a first feed point is located near the second gap. Through the placement of the gap, grounding point, and feed point, the antenna structure can achieve both T-shaped antenna mode and parasitic antenna mode, increasing the number of cellular antenna operating modes. Furthermore, a matching circuit is cascaded at the first gap. By designing the matching circuit, the impact of cascading on NFC and cellular communication performance is reduced, while maintaining compatibility with SAR sensor detection functions. This eliminates the inductor in the NFC feed path of traditional antenna structures, reducing NFC performance loss.

[0074] The electronic device described in this application can be a mobile phone, e-reader, tablet computer, or other electronic products. Other components of the electronic device in the embodiments of this application, such as the casing, are known to those skilled in the art and will not be described in detail here.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electronic device, characterized in that, include: A first frame, a second frame, and a third frame are arranged sequentially; there is a first gap between the first frame and the second frame, and a second gap between the second frame and the third frame; Wherein, at least a portion of the first frame is formed as a first radiator of the antenna structure of the electronic device, and the second frame is formed as a second radiator of the antenna structure; The second radiator has a first feed point and a first ground point; The first feed point is positioned close to the second gap relative to the first grounding point, and the first feed point is connected to the first feed source; the first grounding point is located in the middle part of the second radiator; The first radiator has a second grounding point and a third grounding point. The second grounding point is connected to the first switch, and the third grounding point is located away from the first gap relative to the second grounding point.

2. The electronic device according to claim 1, characterized in that, The electronic device further includes a matching circuit connected between the first end and the second end of the first fracture. The first grounding point is grounded through the first capacitor; A second feed source is also connected to the first grounding point; The antenna structure operates in two modes: cellular communication mode and near-field communication (NFC) mode.

3. The electronic device according to claim 1, characterized in that, A second capacitor is provided between the second grounding point and the first switch.

4. The electronic device according to claim 2, characterized in that, The matching circuit includes a first matching circuit, which is used to enable the antenna structure to radiate in the operating frequency band of NFC mode and the mid-to-high frequency band (MHB) of cellular communication mode.

5. The electronic device according to claim 2, characterized in that, A synthetic aperture radar (SAR) sensor is connected to the second radiator; The matching circuit includes a second matching circuit, which is used to enable the antenna structure to radiate in the operating frequency band of NFC mode and the MHB frequency band of cellular communication mode, and to coexist with the SAR sensor.

6. The electronic device according to claim 4, characterized in that, The first matching circuit includes: First inductor; or, A first inductor, a third capacitor connected in parallel with the first inductor, and a first series circuit connected in parallel with the first inductor, wherein the first series circuit includes a fourth capacitor and a second inductor connected in series.

7. The electronic device according to claim 5, characterized in that, The second matching circuit includes a fifth capacitor and a second series circuit connected in parallel with the fifth capacitor, the second series circuit including a sixth capacitor and a third inductor connected in series.

8. The electronic device according to claim 2, characterized in that, The first radiator also has a second feed point, which is connected to a third feed source; the second feed point is located between the second ground point and the third ground point; wherein, the working modes of the antenna structure include: cellular communication mode, NFC mode and GPS communication mode.

9. The electronic device according to claim 8, characterized in that, The distance between the second power supply point and the third grounding point is greater than or equal to one-tenth of the wavelength of the frequency band corresponding to the GPS communication mode.

10. The electronic device according to claim 1, characterized in that, The distance between the first feed point and the second break is less than or equal to one-quarter wavelength in the mid-to-high frequency band.

11. The electronic device according to any one of claims 1 to 10, characterized in that, The third frame has a fourth grounding point, and the portion between the second slit and the fourth grounding point forms the third radiator of the antenna structure.

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