Electronic device

Abstract

The application discloses an electronic device and belongs to the technical field of electronic products. The electronic device comprises a metal frame body; the metal frame body comprises at least three frame bodies, a first frame body and a second frame body form a first gap, a second frame body and a third frame body form a second gap, and an end of the third frame body away from the second frame body forms a third gap; the second frame body is provided with a first feeding point at a first position close to the second gap, and the second frame body forms a first antenna radiator; the first antenna radiator is used for transmitting signals of a first frequency band, the first frequency band is higher than a first preset frequency; the first feeding point is connected with a matching network; the first frame body is provided with a first grounding point, and a part between the first grounding point and the first gap forms a first parasitic unit of the first antenna radiator; the third frame body is provided with a second grounding point, and a part between the second grounding point and the second gap forms a second parasitic unit of the first antenna radiator.

Description

Technical Field

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

[0002] With the rapid development of 5G communication technology, the frequency bands and number of antennas for mobile terminals have increased dramatically. Moreover, mobile terminals have placed higher demands on antenna signal quality, such as requiring antennas to support 4*4 MIMO and support mid-high frequency (MHB) full-band carrier aggregation (CA). Therefore, higher requirements have been placed on antenna performance.

[0003] At the same time, based on the impact of mobile terminals on the human body's electromagnetic radiation, operators have also put forward clear controls on the specific absorption rate (SAR) of antennas.

[0004] Currently, high-performance antennas and low SAR are often contradictory; higher antenna performance usually results in higher SAR, and the two are generally opposed. Traditional antenna design typically sacrifices antenna performance to meet SAR requirements, but this comes at the cost of sacrificing the user's experience with the terminal signal. Therefore, how to reduce SAR while ensuring antenna performance is a pressing technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide an electronic device that can solve the urgent technical problem of how to reduce SAR value while ensuring antenna performance.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] This application provides an electronic device, including: a metal frame; the metal frame includes at least three frames, wherein a first gap is formed between the first frame and the second frame, a second gap is formed between the second frame and the third frame, and a third gap is formed at the end of the third frame away from the second frame; the second frame has a first feed point at the first position near the second gap, and the second frame forms a first antenna radiator; the first antenna radiator is used to transmit a signal of a first frequency band, the first frequency band being higher than a first preset frequency; the first feed point is connected to a matching network; the first frame has a first ground point, and the portion between the first ground point and the first gap forms a first parasitic unit of the first antenna radiator; the third frame has a second ground point, and the portion between the second ground point and the second gap forms a second parasitic unit of the first antenna radiator.

[0008] In this embodiment, the metal frame includes at least three frames, wherein a first gap is formed between the first frame and the second frame, a second gap is formed between the second frame and the third frame, and a third gap is formed at the end of the third frame away from the second frame. A first feed point is provided in the second frame near the first position of the second gap, and the second frame forms a first antenna radiator. The first antenna radiator, as the feed body, couples and excites the first parasitic element through the first gap, constituting the main body of the radiation mode of the high-frequency antenna. Thus, the first parasitic element is far from the ground feed point, and the first feed point is coupled to the half-wave mode of the first parasitic element through an electric field across the first gap; the second parasitic element is close to the first feed point, forming a strong magnetic field coupling through the second gap, which can optimize the impedance of the high-frequency antenna. Furthermore, through a matching network, full-band high-frequency coverage can be achieved, ensuring antenna performance. Furthermore, since the first feed point is far from the first parasitic element, the two points of maximum current are distributed between the first ground point and the first feed point, making the current more dispersed across the first antenna radiator and the first parasitic element, thereby balancing the mid-to-high frequency SAR values. Therefore, the embodiments of this application satisfy both antenna performance and low SAR characteristics. Attached Figure Description

[0009] Figure 1 A schematic diagram showing the structure of an existing electronic device;

[0010] Figure 2 One of the schematic diagrams of the structure of the electronic device according to an embodiment of the present invention;

[0011] Figure 3 This is one of the S-parameter impedance diagrams of an embodiment of the present invention;

[0012] Figure 4 One of the schematic diagrams illustrating the antenna efficiency of the S-parameters in an embodiment of the present invention;

[0013] Figure 5 One of the schematic diagrams illustrating the overall system efficiency of the S-parameters in an embodiment of the present invention;

[0014] Figure 6 One of the schematic diagrams showing the current distribution of the antenna in an embodiment of the present invention;

[0015] Figure 7 A second schematic diagram illustrating the current distribution of the antenna in an embodiment of the present invention;

[0016] Figure 8 A second schematic diagram illustrating the structure of an electronic device according to an embodiment of the present invention;

[0017] Figure 9 A schematic diagram of the circuit structure of the second regulating switch according to an embodiment of the present invention;

[0018] Figure 10 A second schematic diagram illustrating the antenna efficiency of the S-parameters in an embodiment of the present invention;

[0019] Figure 11 A second schematic diagram illustrating the overall system efficiency of the S-parameters in an embodiment of the present invention;

[0020] Figure 12 The third schematic diagram illustrating the antenna efficiency of the S-parameters in an embodiment of the present invention;

[0021] Figure 13 The third schematic diagram illustrating the overall system efficiency of the S-parameters in an embodiment of the present invention;

[0022] Figure 14 The third schematic diagram illustrating the current distribution of the antenna in an embodiment of the present invention;

[0023] Figure 15 Fourth schematic diagram illustrating the structure of an electronic device according to an embodiment of the present invention;

[0024] Figure 16 The fourth schematic diagram illustrating the current distribution of the antenna in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10-First frame; 11-Second frame; 12-Third frame; 101-First gap; 102-Second gap; 103-Third gap; 104-Fourth gap; 105-Fifth gap; 13-First tuning switch; 14-Matching network; 15-USB module; 16-Speaker module; 17-Second adjustment switch; 18-Radiation length adjustment unit; Ant1-First antenna radiator; Ant2-Second antenna radiator; 20-First sub-frame; 21-Second sub-frame; 22-Third sub-frame; E-First position; H1-Second position; R-Third position; O-Fourth position; J-Fifth position; C1-First capacitor; C2-Second capacitor; C3-Third capacitor; L1-First inductor; L2-Second inductor; L3-Third inductor; 202-Upper structure; 201-Shaft; 200-Lower structure. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] First, to facilitate a comparison between the proposed solution and existing antenna solutions, we will first introduce the existing antenna solutions.

[0030] like Figure 1 The existing antenna structure includes: metal frames 30 and 31, gaps 301 and 302 between the metal frames, antenna switches 32 and 33, USB module 15, and speaker module 16.

[0031] Specifically, two slits 301 and 302 are provided on the metal frame, each with a width of 1mm to 2mm. Two antennas, Ant1 and Ant2, are arranged there. Ant1 is a mid-high frequency (MHF) antenna, with its feed point located at point b on the metal frame 30. Ant2 is a low-frequency (LB) antenna, with its feed point located at point g on the metal frame 31 and its return point at point f. Switch 33 is located at point h on the metal frame 31 and is mainly used to tune the LB bands. Switch 32 is located at point e on the metal frame 31 and is mainly used to tune the MHF bands of Ant1 by switching the df branch of the metal frame 31.

[0032] In the aforementioned traditional antenna scheme, the Ant1 (MHB antenna) achieves single-band tuning by switching the capacitor value using switch 32. This results in a narrow bandwidth, making it difficult to cover frequency bands such as B3 to B1 CA and B3 to B40 CA. Furthermore, switching the antenna aperture introduces losses from the switching device, sacrificing antenna performance. Additionally, the aforementioned scheme exhibits relatively high human SAR values, particularly at higher frequencies.

[0033] Based on the above, this application provides an electronic device for reducing SAR values ​​while ensuring antenna performance.

[0034] The electronic device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0035] Example 1

[0036] See Figure 2The present invention provides an electronic device, including: a metal frame; the metal frame includes at least three frames, wherein a first gap 101 is formed between the first frame 10 and the second frame 11, a second gap 102 is formed between the second frame 11 and the third frame 12, and a third gap 103 is formed at the end of the third frame 12 away from the second frame 11.

[0037] The second frame 11 has a first feed point at a first position E near the second gap 102, and the second frame 11 forms a first antenna radiator; the first antenna radiator is used to transmit signals of a first frequency band, which is higher than a first preset frequency; the first feed point is connected to the matching network 14.

[0038] The first frame 10 is provided with a first grounding point (e.g., ... Figure 2 At point A in the diagram, the portion between the first grounding point and the first gap 101 forms the first parasitic element of the first antenna radiator (Ant1); a second grounding point is provided on the third frame 12 (e.g., at point A in the diagram). Figure 2 The long grounding in the G1 to G2 segment, or, as Figure 8 and 15 At point H2 in the first antenna radiator, the portion between the second grounding point and the second gap 102 forms the second parasitic element of the first antenna radiator.

[0039] Optionally, the first frequency band is a mid-to-high frequency band, such as a first preset frequency equal to 1710MHz, the first frequency band is a frequency band higher than 1710MHz, and the first antenna is an MHB antenna.

[0040] Optionally, the gap widths of the first fracture 101, the second fracture 102, and the third fracture 103 are 1 mm to 2 mm. The length of the metal frame between the first grounding point and the first fracture 101 (e.g., ...) Figure 2 , Figure 8 , Figure 15 The length of the metal frame between the first break 101 and the first feed point (e.g., segment AB) is 12.5mm to 13mm. Figure 2 , Figure 8 , Figure 15 The CE segment in the middle is 14.5mm to 15.5mm.

[0041] Specifically, the second grounding point is a long grounding point. For example... Figure 2 The metal frames from position G1 to position G2 are all grounded. Specifically, the metal frame between the second fracture and G1 forms (i.e.) Figure 2 The FG1 segment in the middle is the second parasitic unit; G2 to the third fracture 103 (i.e. Figure 2 The metal frame between the KG2 segment forms the second antenna radiation unit.

[0042] Optionally, the length of the metal frame between the second grounding point and the second break 102 (i.e., segment FG1) is 2.5 mm to 3.5 mm. The length of the metal frame between the second grounding point and the third break 103 (i.e., segment KG2) is 51 mm to 55 mm.

[0043] It should be noted that in this embodiment, the initial impedance generated by Ant1 can be tuned to close to 50 ohms by adjusting the length of the second parasitic unit, and the impedance of the MHB is made as circular as possible, thereby optimizing the impedance of the high-frequency antenna. (See below.) Figure 3 The diagram shows the initial impedance of Ant1 with different second parasitic unit lengths (FG1).

[0044] In addition, since the first antenna radiator adopts a single-pole feeding method, the resulting intermediate frequency impedance is relatively long. The feeding signal can be tuned through a matching network to achieve full-band coverage of the intermediate and high frequencies.

[0045] In the above embodiment, the first antenna radiator adopts a single-pole feeding method. A first feed point is set at a first position E near the second gap 102 in the second frame 11. The first antenna radiator serves as the feed body, and the first parasitic element is coupled and excited through the first gap 101 to form the main body of the radiation mode of the high-frequency antenna. In this antenna structure, the first feed point is set at the end away from the first parasitic element. The first feed point is coupled to the half-wave mode of the first parasitic element through the electric field across the first gap 101. The second parasitic element is close to the first feed point. The first feed point forms a strong magnetic field coupling through the second gap 102, which can optimize the impedance of the high-frequency antenna. Furthermore, through the matching network 14, full-band coverage of high-frequency and mid-frequency can be achieved, ensuring the performance of the antenna. Moreover, since the first feed point is far from the first parasitic element, the two points of maximum current are distributed at the first ground point and the first feed point, making the current more dispersed on the first antenna radiator and the first parasitic element, thereby balancing the mid-frequency and high-frequency SAR values.

[0046] That is, the first antenna radiator Ant1 in this application adopts branch end feeding. By adjusting the feeding position and increasing the distance between the feeding position and the first parasitic element, it is possible to reduce the high-frequency 0mm body SAR value while achieving MHB broadband CA coverage, and no additional high-frequency branch is required.

[0047] The following uses Body SAR values ​​as an example to illustrate the technical effects achieved by the above embodiments in conjunction with simulation data.

[0048] As shown in Tables 1 and 2 below, these illustrate Example 1 (hereinafter collectively referred to as "Case 2") and the prior art as follows. Figure 1The bottom side normalized to -5dB Body SAR values ​​(SAR value unit: W / Kg-10g) of the illustrated embodiment (hereinafter collectively referred to as "Case 1") are compared.

[0049] As can be seen from the simulation data in Table 1 below, for body SAR testing, when the test distance is 5mm (Body 5mm) and the antenna efficiency is normalized to -5dB, the SAR of Case 2 is lower than that of Case 1.

[0050]

[0051] Table 1

[0052] As shown in Table 2 below: For body SAR testing at a test distance of 0mm, when the antenna efficiency is normalized to -5dB, the SAR value of Case 2 for B7 is nearly half that of Case 1, indicating that Case 2 exhibits low SAR characteristics. Although the SAR of Case 2 is higher than that of Case 1 compared to B3, the SAR value of Case 2 is more balanced than that of Case 1. It avoids the phenomenon of extremely high SAR values ​​for B7 and extremely low SAR values ​​for B3 seen in Case 1. For example, the SAR value of B7 reaches 4.75, while the actual certification standard SAR value is 4. Therefore, overall, compared to existing antenna solutions, the antenna solution of this application has a lower SAR value.

[0053]

[0054] Table 2

[0055] To illustrate the relationship between high-frequency SAR and the relative positions of the first feed point and the first ground point, the following is combined with... Figure 6 and Figure 7 Please provide an explanation.

[0056] like Figure 6 As shown, it illustrates the current distribution diagram of Case 1 in state B7 with a body size of 0mm (arrows are used to indicate the direction of current flow). Figure 7 As shown, this plot illustrates the current distribution of Case 2 in state B7 with a body size of 0mm. Generally, SAR hotspots with a body size of 0mm are closer to high-current locations such as the feed point and feed location. Figure 6 The current distribution also shows that in Case 1, the current is concentrated in the first parasitic unit AB segment. The two high current points are located at the ground return location and the feed location, respectively, and these two locations are relatively close, resulting in a high B7 SAR value. From... Figure 7As can be seen from the current distribution, the current distribution of the antenna scheme of this application is on the feed body and the first parasitic element. Since the feed position is set at the first position E near the second gap 102 of the feed body, the first feed point is far away from the ground return position A of the first parasitic element. This achieves the effect of relatively dispersing the two maximum current points A and E. Therefore, the antenna scheme B7 SAR value of this application embodiment is low, thereby achieving the purpose of balancing the MHB SAR value.

[0057] Optionally, such as Figure 2 In the process, the matching network 14 includes an LC circuit, which includes a first inductor L1 and a first capacitor C1; the power supply signal input terminal is connected to the first power supply point through the first capacitor C1; one end of the first inductor L1 is grounded, and the other end is connected to the connection point between the first capacitor C1 and the first power supply point.

[0058] In this embodiment, the feed body adopts a single-pole feed form, resulting in a relatively long intermediate frequency impedance. Therefore, a first capacitor C1 (optionally 2pF to 3pF) needs to be connected in series to pull the intermediate frequency from the second quadrant to the third quadrant. Then, the first inductor L1 is connected in parallel to achieve resonance at B3. Combined with the high-frequency resonance generated by the first parasitic unit, a dual resonance can be formed, thereby achieving full-band coverage of MHB (1710-2690MHz). The resulting antenna bandwidth is relatively wide and can well support B1-B3 CA. Furthermore, this embodiment does not require switching, saving costs and reducing the impact of switching devices on antenna performance, thus improving antenna performance.

[0059] like Figure 4 As shown, it illustrates the S-parameters (antenna return loss) of the proposed solution after matching via matching network 14. The final S-parameters reveal two distinct dual resonators forming a wideband, covering MHB 1710-2690MHz; as... Figure 5 As shown, it illustrates the antenna efficiency after matching by the matching network 14.

[0060] Optionally, the electronic device further includes: a USB module 15 disposed inside the second frame 11; the end of the second frame 11 near the second gap 102 extends into the electronic device by a first distance.

[0061] like Figure 2 In this example, the first slit 101 and the second slit 102 are located on both sides of the USB module 15 and are symmetrically distributed. The second frame 11 extends a first distance into the electronic device from one end near the second slit 102, and the first power supply point is located at the end of the second frame 11 near the second slit 102. In this way, the first power supply point is kept away from the USB module 15, avoiding interference from the USB module 15 to the first power supply point.

[0062] Example 2

[0063] It should be noted that the first embodiment described above achieves wideband coverage in the MHB band and has advantages in CA performance, with relatively balanced SAR values ​​across the entire MHB band. However, the SAR values ​​in some bands are relatively high, such as the relatively high 0mm BodySAR value in the B3 band, which requires further optimization.

[0064] Based on the above, this application provides the following second embodiment to further optimize the single-band performance and SAR value of the Ant1 antenna. The following is based on... Figures 8 to 14 Please provide an explanation.

[0065] See Figure 8 This invention provides an electronic device, comprising: a metal frame; the metal frame includes at least three frames, wherein a first gap 101 is formed between a first frame 10 and a second frame 11, a second gap 102 is formed between the second frame 11 and a third frame 12, and a third gap 103 is formed at the end of the third frame 12 away from the second frame 11; a first feed point is provided at a first position E near the second gap 102 on the second frame 11, and the second frame 11 forms a first antenna radiator; the first antenna radiator is used to transmit signals of a first frequency band, the first frequency band being higher than a first preset frequency; the first feed point is connected to a matching network 14; a first grounding point (e.g., ...) is provided on the first frame 10. Figure 8 At point A in the diagram, the portion between the first grounding point and the first gap 101 forms the first parasitic element of the first antenna radiator (Ant1); a second grounding point is provided on the third frame 12 (e.g., at point A in the diagram). Figure 8 At point H2 in the first antenna radiator, the portion between the second grounding point and the second gap 102 forms the second parasitic element of the first antenna radiator.

[0066] Specifically, a second adjusting switch 17 is provided at the second position H1 between the second grounding point and the second break 102; specifically, as shown in the figure... Figure 9 In the middle, the second adjustment switch 17 includes: a switch, a second capacitor C2, a third capacitor C3, a second inductor L2, and a third inductor L3; one end of the switch is grounded, and the other end is connected to the first end of the second capacitor C2, the third capacitor C3, the second inductor L2, and the third inductor L3, and the second end of the second capacitor C2, the third capacitor C3, the second inductor L2, and the third inductor L3 is connected to the second position H1.

[0067] Optionally, the length of the metal frame between the second break 102 and the second adjusting switch 17 is 4mm to 7mm; the length of the metal frame between the second break 102 and the second grounding point is 15mm to 17mm.

[0068] It should be noted that in this second embodiment, only the size of the second parasitic unit is adjusted, and the second adjustment switch 17 is connected at the position between the second grounding point and the second gap 102. The size and structure of the first parasitic unit and the first antenna radiator are the same as in the first embodiment, and will not be described again here.

[0069] In the above embodiments of this application, the opening of the second parasitic unit FH2 is close to the first feed point of Ant1, and forms a strong electromagnetic coupling with the feed body through the second gap 102. By switching different capacitance or inductance values ​​through the second adjustment switch 17, the following two effects can be achieved: First, the antenna impedance is tuned to optimize the antenna group impedance, reduce reflection loss, and achieve the purpose of optimizing single-band performance; Second, the resonance of the second parasitic unit FH2 is tuned, generally to the point before the resonance of the feed body (taking B3 as an example, when the second adjustment switch 17 is connected to capacitor C (0.5-1pF), the resonance of the second parasitic unit FH2 can be switched to the point before 1.71G), thereby exciting a current in the same direction as the feed body, thereby improving radiation efficiency. At the same time, since the concentration of current is reduced, the SAR value can be reduced.

[0070] The technical effects achieved by the above embodiments are explained below with reference to simulation data.

[0071] like Figure 10 As shown, it is a comparison diagram of the final S-parameters of Ant1 B3 state in Example 2 (hereinafter referred to as "Case 3") and Ant1 in Example 1 (hereinafter referred to as "Case 2").

[0072] See Figure 10 Looking at the Case 3 B3 band curve, there is a resonance at 1.548 GHz before the main resonance at 1.71 GHz. This resonance is generated by the branch of the second parasitic unit FH2. From the impedance perspective, by introducing this parasitic resonance, the return loss in the B3 band is deepened and brought closer to 50 ohms, thereby reducing the reflection loss. On the other hand, it excites the same-direction current of the second parasitic unit, improves the aperture radiation efficiency of the antenna, and ultimately optimizes the performance of the B3 single-state.

[0073] like Figure 11As shown, this curve compares the final efficiency of Ant1 B3 state in Case 3 with that of Ant1 in Case 2. The curves show that the efficiency of the B3 Tx portion in Case 3 is 0.7 dB higher than that of Ant1 in Case 2, and the average in-band efficiency is 0.5 dB higher. Furthermore, connecting the second capacitor C2 via the second adjustment switch 17 can also optimize the sideband of B41, improving its efficiency. Similarly, when the second inductor L2 is connected via the second adjustment switch 17, it switches to state B1 / B39; when connected, it switches to state B40, achieving optimization of single-state operation. Additionally, when both C2 and C3 are connected simultaneously via the second adjustment switch 17, full coverage of the MHB CA state is achieved.

[0074] like Figure 12 As shown, it illustrates the S-parameters of each state of Ant1; as... Figure 13 As shown, this diagram illustrates the antenna efficiency for each state of Ant1, including both single-state and CA wideband states. The efficiency curves reveal that the single-band efficiency of Ant1 B1 / B39 / B40 in Case 3 is improved compared to Ant1 in Case 2.

[0075] Furthermore, taking the body SAR (body SAR) value as an example, and referring to Tables 3 and 4 below, we will explain the differences between Example 1 (hereinafter collectively referred to as Case 2), Example 2 (hereinafter collectively referred to as Case 3), and the traditional existing scheme (hereinafter collectively referred to as Case 1).

[0076] Tables 3 and 4 below show the bottomside SAR values ​​for Case 1 / 2 / 3 after the antenna efficiency was normalized to -5dB (SAR value unit: W / Kg-10g).

[0077]

[0078]

[0079] Table 3

[0080] As can be seen from the simulation data in Table 3 above, for the body SAR test, at a test distance of 5mm (Body5mm), the SAR value of Case 3 is generally lower than that of Case 2 and Case 1.

[0081]

[0082] Table 4

[0083] As can be seen from the simulation data in Table 4 above, for the body SAR test, at a test distance of 0mm (Body 0mm), the SAR value of Case 3 B7 is comparable to that of Case 2, and both are much lower than that of Case 1. Compared with the SAR of B3, Case 3 is lower than both Case 2 and Case 1. Therefore, considering the antenna structure of Case 3, it not only improves antenna performance but also has low SAR characteristics.

[0084] Regarding the characteristic in Case 3 of this application that the B3 SAR value is significantly lower than that in Case 2 under the Body 0mm state, according to... Figure 14 The principle can be understood from the current distribution diagram shown. Figure 14 As can be seen, the SAR hotspots are no longer concentrated near the feed body and the second gap 102 as in Case 2, but are evenly distributed in the first parasitic element (segment AB of the first frame 10), the first antenna radiator, the second parasitic element (segment FH2 of the third frame 12), and there is also current distribution in segment H2I at the corner of the third frame 12. Due to the more even distribution of current, the SAR of B3 in Case 3 will decrease significantly. At the same time, this embodiment also constructs a current in the same direction, further improving the antenna radiation performance.

[0085] In an alternative embodiment, the second grounding point is grounded through a radiation length adjustment unit 18; wherein the inductance of the radiation length adjustment unit 18 is less than a first value, or the resistance of the radiation length adjustment unit 18 is 0 ohms.

[0086] Specifically, the first value is 5nH, and the inductance value of the radiation length adjustment unit 18 is less than 5nH, such as 1nH to 3nH.

[0087] Example 3

[0088] It should be noted that the antenna performance of foldable electronic devices in the folded state is often affected by the other half of the structure, such as the ITO screen and the other half of the metal frame. Currently, how to reduce the impact of the other half of the terminal structure on the main antenna in the folded state, thereby improving the antenna performance in the folded state, is a technical challenge that urgently needs to be solved.

[0089] In this third embodiment, the solution of the second embodiment is applied to a foldable electronic device, and an antenna solution is designed for the foldable electronic device, which can solve the problem that the antenna performance in the folded state is affected by the other half of the structure.

[0090] Specifically, the metal frame of the electronic device is rotatably connected to a first housing and a second housing, and the first housing can switch between an unfolded state and a folded state relative to the second housing; the aforementioned first antenna radiator, first parasitic unit and second parasitic unit are located in the first housing;

[0091] The first frame 10, located in the portion of the second housing, has a fourth seam 104 and a fifth seam 105. The fourth seam 104 and the fifth seam 105 divide the first frame 10 into a first sub-frame 20, a second sub-frame 21, and a third sub-frame 22. The fourth seam 104 is located between the first sub-frame 20 and the second sub-frame 21, and the fifth seam 105 is located between the second sub-frame 21 and the third sub-frame 22. The third sub-frame 22 has a fourth grounding point, and a third tuning switch 23 is connected at a third position R between the fourth grounding point and the fifth seam 105. The second sub-frame 21 has a third grounding point, and a fourth tuning switch 24 is connected at a fourth position O between the third grounding point and the fifth seam 105.

[0092] Optionally, the length of the metal frame between the first grounding point and the first break 101 is 12.5 mm to 13 mm; the length of the metal frame between the first break 101 and the first power supply point is 14.5 mm to 15.5 mm.

[0093] like Figure 15 As shown, it is a schematic diagram of an electronic device structure that folds up and down. The folding electronic device includes an upper structure 202, a pivot 201, and a lower structure 200. The lower structure 200 includes a first housing, which includes Ant1 and Ant2. Its antenna layout is the same as in Embodiment 2, and will not be described again here.

[0094] The following is in conjunction with the appendix Figure 15 , Introduction to the upper structure 202.

[0095] Specifically, the upper structure 202 includes a second housing, on which a fourth slit 104 and a fifth slit 105 are provided; the fourth slit 104 and the fifth slit 105 divide the first frame 10 into a first sub-frame 20, a second sub-frame 21, and a third sub-frame 22. The fourth slit 104 and the fifth slit 105 are located on both sides of the second sub-frame 21, wherein a third grounding point is provided at position N on the second sub-frame 21, and a fourth tuning switch 24 is located at point O; a fourth grounding point is provided at position S on the third sub-frame 22, and a third tuning switch 23 is located at point R.

[0096] In this embodiment, the second sub-frame 21 forms the first auxiliary parasitic branch; the third sub-frame 22 forms the second auxiliary parasitic branch.

[0097] Optionally, the OP length is 2mm to 6mm; the length of the second sub-frame 21 is 42mm to 50mm, the NP length is 20mm to 30mm; the QS segment length is 12-18mm, and the QR length is 2mm to 6mm.

[0098] In practical applications, when such Figure 15 When the electronic device shown is in a folded state, different inductors, capacitors, or 0 ohms are switched by the third tuning switch 23 and the fourth tuning switch 24 respectively, adjusting the resonance of the first auxiliary parasitic branch and the second auxiliary parasitic branch so that their resonances fall in front of the Ant1 frequency band.

[0099] Taking Ant1-B3 as an example, when the electronic device is in a folded state, the upper structure 202 has a significant impact on its performance, mainly manifested in performance absorption, including absorption by the screen, clutter generated by the upper metal frame, and reverse current coupled to the frame. These will ultimately lead to a decrease in the performance of Ant1-B3 in the folded state. At this time, by tuning the resonance of the first auxiliary parasitic branch through the third tuning switch 23 and the resonance of the second auxiliary parasitic branch through the fourth tuning switch 24, they fall in front of the Ant1-B3 frequency band, which can excite the same current as the Ant1-B3 radiating body, increase the antenna radiating aperture, and thus improve the antenna radiation performance, thereby reducing the impact of the folded state on the original performance of the antenna.

[0100] like Figure 16 As shown, it illustrates the current distribution diagram of the top (second shell) and bottom (first shell) end faces of the metal frame in the Ant1-B3 folded state (arrows are used to indicate the current flow direction distribution). From the current distribution, it can be seen that the current on the auxiliary parasitic branches (first auxiliary parasitic branch and second auxiliary parasitic branch) is in the same direction as the current on the feed body (first antenna radiator) and the parasitic branches (first parasitic unit and second parasitic unit).

[0101] It's important to note that while the current is strongest in the same direction, it's not always the same direction at all phases. The direction of the excitation current depends on the length of the parasitic branch, which in turn depends on its resonance. Generally, if there's an efficiency dip before the parasitic branch resonance, it should be placed before the main resonance to more easily generate the same-direction current. Conversely, it should be placed after the main resonance. Typically, the opening of the auxiliary parasitic branch is placed near the feed body to create stronger electromagnetic coupling.

[0102] It should be noted that the position of the fracture can be adjusted according to the actual project requirements, and this application does not impose specific restrictions. For example, the fracture positions on the first shell and the second shell can be aligned vertically.

[0103] In the above embodiments, on the one hand, the resonance of the first auxiliary parasitic branch and the second auxiliary parasitic branch are tuned by the third tuning switch 23 and the fourth tuning switch 24 respectively, so that they fall in front of the Ant1-B3 frequency band, thereby exciting the current in the same direction as the Ant1-B3 radiating body, increasing the antenna radiation aperture, improving the antenna radiation performance, and reducing the impact of the folded state on the original performance of the antenna; on the other hand, since there is coupling current on the first auxiliary parasitic branch and the second auxiliary parasitic branch, in the folded state, the concentration of current distribution on the feed body and parasitic branches on the first shell can be reduced, that is, the current of the feed body can be dispersed by the auxiliary parasitic branches, thereby reducing the SAR value of the antenna, and finally realizing the characteristics of high performance and low SAR value of the foldable electronic terminal in the folded state.

[0104] It should be noted that the antenna placement shown in the above figures is merely an example and is not intended to be limiting. The placement of the antenna in electronic devices can be adjusted according to the actual application.

[0105] Optionally, such as Figure 2 , Figure 8 and Figure 15 As shown, the electronic device also includes:

[0106] Second grounding point (e.g.) Figure 2 Point G2 in the middle, such as Figure 8 and Figure 15 A first tuning switch 13 is connected at the fifth position J between point H2 and the third fracture 103; a second feed point is provided between the fifth position J and the second grounding point. Figure 2 The arrow at position I indicates that the feed signal is input to the second feed point; the portion between the second grounding point and the third gap 103 forms the second antenna radiator; the second antenna radiator is used to transmit signals in the second frequency band, which is lower than the second preset frequency; the second preset frequency is less than or equal to the first preset frequency. Optionally, the second frequency band is a low-frequency band, such as the second preset frequency being equal to 1710MHz, the second frequency band being a frequency band below 1710MHz, and the first antenna is an LB antenna.

[0107] Optionally, the length of the metal frame between the second grounding point and the third break 103 is 51mm to 55mm, and the second feed point (e.g. Figure 2 From position I in the middle to the second grounding point (e.g., Figure 2 The length of the metal frame between G2 and the fifth position (e.g., the second feed point) is 15mm to 18mm. Figure 2 The length of the metal frame between the I position and the metal frame is 7mm to 10mm.

[0108] In this embodiment, it is possible to simultaneously support both mid-to-high frequency antennas and low-frequency antennas. The low-frequency antenna switches different capacitance values ​​through the first tuning switch 13 to achieve coverage of each frequency band of LB.

[0109] Optionally, the electronic device also includes a speaker module 16, which is located near the first frame 10.

[0110] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0111] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0112] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An electronic device, characterized in that, include: A metal frame; the metal frame includes at least three frames, wherein a first gap is formed between the first frame and the second frame, a second gap is formed between the second frame and the third frame, and a third gap is formed at the end of the third frame away from the second frame. The second frame has a first feed point at a first position near the second fracture, and the second frame forms a first antenna radiator; the first antenna radiator is used to transmit signals of a first frequency band, which is higher than a first preset frequency; the first feed point is connected to a matching network; The first frame is provided with a first grounding point, and the portion between the first grounding point and the first gap forms the first parasitic unit of the first antenna radiator; The third frame is provided with a second grounding point, and the portion between the second grounding point and the second gap forms the second parasitic unit of the first antenna radiator; A second adjusting switch is provided at a second position between the second grounding point and the second fracture. The electronic device further includes: a first housing and a second housing rotatably connected to the metal frame, wherein the first housing is switchable between an unfolded state and a folded state relative to the second housing; the first antenna radiator, the first parasitic unit, and the second parasitic unit are located in the first housing; The first frame, located in the portion of the second housing, has a fourth and a fifth seam. The fourth and fifth seams divide the first frame into a first sub-frame, a second sub-frame, and a third sub-frame. The fourth seam is located between the first and second sub-frames, and the fifth seam is located between the second and third sub-frames. The first antenna radiator, the first seam, and the second seam are all located in the bottom frame corresponding to the first housing, while the fourth seam, the fifth seam, and the second sub-frame are all located in the top frame corresponding to the second housing. A fourth grounding point is provided on the third sub-frame, and a third tuning switch is connected at a third position between the fourth grounding point and the fifth seam. The second sub-frame forms the first auxiliary parasitic branch, and a third grounding point is provided on the second sub-frame; a fourth tuning switch is connected at a fourth position between the third grounding point and the fifth fracture. The third sub-frame forms a second auxiliary parasitic branch; wherein, in the folded state, the currents on the first and second auxiliary parasitic branches are in the same direction as the currents on the first antenna radiator and the first and second parasitic units; A first tuning switch is connected at the fifth position between the second grounding point and the third fracture, and a second power supply point is provided between the fifth position and the second grounding point; The portion between the second grounding point and the third gap forms a second antenna radiator; the second antenna radiator is used to transmit signals in a second frequency band, which is lower than a second preset frequency; the second preset frequency is less than or equal to the first preset frequency.

2. The electronic device according to claim 1, characterized in that, The second adjustment switch includes: a switching switch, a second capacitor, a third capacitor, a second inductor, and a third inductor; one end of the switching switch is grounded, and the other end is connected to the first end of the second capacitor, the third capacitor, the second inductor, and the third inductor; the second end of the second capacitor, the third capacitor, the second inductor, and the third inductor is connected to the second position.

3. The electronic device according to claim 1, characterized in that, The second grounding point is grounded through the radiation length adjustment unit; Wherein, the inductance of the radiation length adjustment unit is less than the first value, or the resistance of the radiation length adjustment unit is 0 ohms.

4. The electronic device according to claim 1, characterized in that, The electronic device further includes: a USB module disposed inside the second frame; The second frame extends a first distance into the electronic device from one end near the second gap.

5. The electronic device according to any one of claims 1 to 4, characterized in that, The matching network includes an LC circuit, which includes a first inductor and a first capacitor. The power input terminal is connected to the first power supply point through the first capacitor; one end of the first inductor is grounded, and the other end is connected to the connection point between the first capacitor and the first power supply point.

6. The electronic device according to claim 1, characterized in that, The length of the metal frame between the second grounding point and the second break is 2.5mm to 3.5mm.

7. The electronic device according to claim 1, characterized in that, The length of the metal frame between the second fracture and the second grounding point is 15mm to 17mm.

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