Electronic device

Abstract

The application discloses an electronic device, and relates to the field of electronic products. The electronic device comprises a metal frame body and a tuning assembly. The metal frame body is provided with a gap, and the side wall of the metal frame body at the gap is provided with a first gap and a second gap. The metal frame body forms a main branch and a first parasitic branch of an antenna on the two sides of the first gap. The main branch is provided with a first feeding point, and the first feeding point is connected with a first feeding signal circuit. The length of the main branch is 1 / 4 wavelength of low frequency and 1 / 2 wavelength of medium-high frequency. A first tuning switch is arranged on a tuning connecting piece. One end of the tuning connecting piece is connected with the first parasitic branch, and the other end of the tuning connecting piece is used for receiving signals. A second tuning switch is arranged on the first feeding signal circuit. The first tuning switch and the second tuning switch work at different resonant frequencies to adapt to multiple different communication frequency bands. The application can at least solve the problem that an antenna cannot have good performance under the condition of integrating multiple communication frequency bands.

Description

Technical Field

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

[0002] Currently, full-screen metal-cased smart terminals are gradually developing towards the demand for large-capacity batteries. In addition to the advancement of battery materials, the required battery size is also increasing. However, the overall capacity space of the device is limited, so the only option is to compress the hardware and structural space of the device, such as shortening the length of the circuit board. This leads to an imbalance between structural strength and antenna space, posing challenges to the design of the terminal phone antenna. For example, the reduction in antenna space, the limitation of antenna feeding position, and the limitation of antenna design methods to structural strength requirements result in the antenna not being able to achieve good antenna performance when integrating multiple communication frequency bands, thus making the antenna unable to meet the needs of some scenarios. Summary of the Invention

[0003] The purpose of this application is to provide an electronic device that can at least solve the problem that antennas cannot achieve good antenna performance when multiple communication frequency bands are integrated.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: This application provides an electronic device, including: a metal frame and a tuning assembly; The metal frame has gaps, and the sidewalls of the metal frame at the gaps have a first slit and a second slit. The metal frame forms a main branch and a first parasitic branch of the antenna on both sides of the first slit, respectively. The main branch has a first feed point, which is connected to a first feed signal circuit. The length of the main branch is 1 / 4 wavelength of the low-frequency band, where the low-frequency band ranges from 0.7 GHz to 1 GHz, and the length of the main branch is 1 / 2 wavelength of the mid-to-high-frequency band, where the mid-to-high-frequency band ranges from 1.7 GHz to 2.7 GHz. The tuning assembly includes a tuning connector, a first tuning switch, and a second tuning switch. The first tuning switch is located on the tuning connector. One end of the tuning connector is connected to the first parasitic stub, and the other end of the tuning connector is used to receive signals. The second tuning switch is located in the first feed signal circuit. The antenna can be operated at different resonant frequencies by the first tuning switch and the second tuning switch to adapt to various communication frequency bands.

[0005] In this embodiment, a slotted antenna can be formed by providing a first and a second slot on the side wall of the metal frame. A first feed signal circuit can input a signal to the antenna. During signal radiation, the antenna's impedance is tuned by the cooperation of a first and a second tuning switch, allowing the antenna to operate at different resonant frequencies. This adapts the antenna to various communication frequency bands, enabling it to maintain good performance even when integrating multiple communication bands and meeting the needs of more scenarios. Furthermore, the main and branch sections can be reused in low and mid-high frequencies, which helps increase the radiating aperture while saving antenna space, thereby improving antenna performance. Attached Figure Description

[0006] Figure 1 These are schematic diagrams of the electronic device disclosed in the embodiments of this application from different perspectives; Figure 2 This is a schematic diagram of the structure of the electronic device disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the electronic device disclosed in the embodiments of this application in the antenna region; Figure 4 This is a partial schematic diagram of the connection between the tuning component and the battery compartment and metal frame disclosed in the embodiments of this application; Figure 5 This is a partial schematic diagram of the connection between the tuning component and the battery compartment as disclosed in an embodiment of this application; Figure 6 This is a schematic diagram of the matching topology of the first tuning switch disclosed in an embodiment of this application; Figure 7 This is a schematic diagram of the matching topology of the second and third tuning switches disclosed in an embodiment of this application; Figure 8 This is a schematic diagram of the return loss of the antenna operating at B1 as disclosed in the embodiments of this application; Figure 9 This is a current distribution diagram at a frequency of 0.9 GHz disclosed in an embodiment of this application; Figure 10 This is a schematic diagram of the return loss of the antenna operating at low frequency B8 as disclosed in the embodiments of this application; Figure 11 This is a current distribution diagram at a frequency of 2GHz disclosed in an embodiment of this application; Figure 12 This is a schematic diagram of the electronic device in the antenna region under dual-resonance mode disclosed in the embodiments of this application; Figure 13 This is a schematic diagram of return loss in the dual-resonance mode disclosed in the embodiments of this application; Figure 14 This is a current distribution diagram under the first resonance disclosed in the embodiments of this application; Figure 15 This is a current distribution diagram under the second resonance disclosed in the embodiments of this application; Figure 16 This is a schematic diagram of the second power supply signal circuit disclosed in the embodiments of this application; Figure 17 This is a schematic diagram illustrating the obtained better bandwidth in the filtered dual-resonant mode disclosed in the embodiments of this application; Figure 18 This is a schematic diagram illustrating the high antenna efficiency obtained in the filtered dual-resonance mode disclosed in the embodiments of this application; Figure 19 This is a schematic diagram of the detection circuit integrated into the embodiment of this application.

[0007] Explanation of reference numerals in the attached figures: 10-Metal frame; 11-Frame; 111-First gap; 112-Second gap; 113-Main branch; 1131-First feed point; 114-First parasitic branch; 115-Second parasitic branch; 1151-Second feed point; 12-Battery compartment; 13-Gap; 14-Insulating material; 20-Tuning assembly; 21-Tuning connector; 22-Tuning contact; 23-Tuning grounding component; 24-Spring; 25-First tuning switch; 251-Single-pole single-throw switch; 252-First lumped parameter device; 26-Second tuning switch; 261-Single-pole multi-throw switch; 262-Second lumped parameter device; 30 - First power supply signal circuit; 40 - Second feed signal circuit; 40a - Filter; 41 - First stage filter device; 42 - Second stage filter device; 50 - Detection circuit; 60 - Motherboard; 70 - Battery; 80 - Display screen; 90 - Back cover. Detailed Implementation

[0008] 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.

[0009] 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, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. 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.

[0010] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0011] refer to Figures 1 to 19 This application discloses an electronic device, such as a mobile phone, tablet, or wearable device. The disclosed electronic device includes a metal frame 10 and a tuning assembly 20. In addition, the electronic device may also include components such as a display screen 80, a back cover 90, a motherboard 60, and a battery 70. The specific arrangement and connection method of these components can be referred to the prior art, and will not be described in detail here.

[0012] The metal frame 10 is provided with a gap 13 (or slot, antenna clearance, etc.), and the side wall of the metal frame 10 at the gap 13 can be provided with a first slot 111 and a second slot 112. In this way, a slotted antenna (hereinafter referred to as an antenna) can be formed, so that electronic devices can radiate signals through the metal frame 10 as an antenna.

[0013] Optionally, the electronic device can be a mobile phone, tablet computer, or other components. In this case, the first gap 111 and the second gap 112 can be opened in the middle area of ​​one edge of the electronic device, so that when the user uses the electronic device in landscape mode, the area where the user holds the device is avoided, reducing the impact of the user's hand holding on the signal, thereby improving the performance of the electronic device in landscape holding scenarios (such as games).

[0014] The metal frame 10 can form a main antenna branch 113 and a first parasitic branch 114 on both sides of the first slot 111, respectively. The main antenna branch 113 has a first feed point 1131, which is connected to a first feed signal circuit 30. Thus, a signal can be input to the first feed point 1131 through the first feed signal circuit 30, so that the signal can be radiated to the outside through the antenna. Optionally, the first feed signal circuit 30 can be connected to a power supply to receive the feed signal emitted by the power supply.

[0015] Optionally, the portion between the first slot 111 and the second slot 112 is the main stub 113 of the antenna. The length of the main stub 113 can be L1, and the length of the main stub 113 can be 1 / 4 wavelength of the low frequency (i.e., the first frequency band), wherein the low frequency range can be 0.7 GHz to 1 GHz; and the length of the main stub 113 can be 1 / 2 wavelength of the mid-high frequency (i.e., the second frequency band), wherein the mid-high frequency range can be 1.7 GHz to 2.7 GHz.

[0016] Based on the above configuration, when the antenna operates at low frequency, the main branch 113 can be used as a 1 / 4 wave mode at low frequency; when the antenna operates at mid-to-high frequency, the main branch 113 can be used as a 1 / 2 wave mode at mid-to-high frequency, thus enabling the main branch 113 to achieve the purpose of reusing antenna space in low frequency and mid-to-high frequency.

[0017] Meanwhile, for mid-to-high frequencies, the intersection of the 1 / 2-wave mode and the 1 / 4-wave mode results in a larger radiating aperture, leading to higher antenna performance. For low frequencies, the addition of the first parasitic stub 114 also allows for a larger radiating aperture, resulting in higher antenna performance. The tuning component 20 is used to tune the antenna to change its resonant frequency.

[0018] The tuning assembly 20 may include a tuning connector 21, a first tuning switch 25, and a second tuning switch 26. One end of the tuning connector 21 is connected to the first parasitic stub 114, and the other end of the tuning connector 21 is used to receive signals. The first tuning switch 25 is located on the tuning connector 21. Thus, when the tuning connector 21 receives a control signal, it can be used to tune the antenna.

[0019] Optionally, the tuning connector 21 can be a tuning FPC formed by integrating the tuning circuit onto the FPC. Other forms are also possible, and no specific limitation is made here. When the tuning connector 21 is a tuning FPC, it can be equipped with processor interface lines (MIPI lines), power lines, etc., to provide the control signals and power required for the operation of the first tuning switch 25, thereby switching the on / off state of the first tuning switch 25 and achieving dynamic tuning of the antenna. Furthermore, the other end of the tuning connector 21 can be connected to the motherboard 60 of the electronic device, allowing the motherboard 60 to control the conduction state of the branches in the tuning circuit. It should be noted that the specific structure and working principle of the tuning circuit can be found in relevant technologies, and will not be elaborated upon here.

[0020] The second tuning switch 26 is located in the first feed signal circuit 30. The first feed signal circuit 30 can not only feed the antenna through the first feed point 1131, but also enable the second tuning switch 26 and the first tuning switch 25 to work together to tune the antenna. In this way, the first tuning switch 25 and the second tuning switch 26 can make the antenna work at different resonant frequencies so that the resonant frequency can be adapted to a variety of different communication frequency bands.

[0021] Based on the above configuration, in this embodiment, a slotted antenna can be formed by providing a first slot 111 and a second slot 112 on the side wall of the metal frame 10. A signal can be input to the antenna via the first feed signal circuit 30. During the antenna's signal radiation, impedance tuning is performed through the cooperation of the first tuning switch 25 and the second tuning switch 26, allowing the antenna to operate at different resonant frequencies. This adapts to various communication frequency bands, enabling the antenna to maintain good performance even when integrating multiple communication frequency bands, and allowing the slotted antenna to meet the needs of more scenarios. Furthermore, the main branch 113 can be reused in low and mid-high frequencies, which helps to increase the radiating aperture and improve antenna performance.

[0022] refer to Figures 2 to 5 , Figure 12 In some embodiments, the metal frame 10 may include a frame 11 and a battery compartment 12 disposed inside the frame 11, with a gap 13 formed between a portion of the sidewall of the frame 11 and the battery compartment 12, thereby making full use of the layout between the frame 11 and the battery compartment 12 to form the gap 13. Optionally, inside the rear shell 90 of the electronic device, the frame 11 is arranged around the perimeter and protrudes in the middle region to form the battery compartment 12, which can accommodate a battery 70 to power the electronic device.

[0023] Additionally, a motherboard 60 (e.g., a PCB board) may be provided on the inner side of the frame 11 and above the battery compartment 12. Various circuits and electronic devices are installed on the motherboard 60 to control or process various functions of the electronic device, including the communication function of the electronic device.

[0024] In some embodiments, the tuning assembly 20 may further include a tuning contact 22 and a tuning grounding member 23 respectively disposed at one end of the tuning connector 21. A first tuning switch 25 is disposed on the tuning connector 21 in the region between the tuning contact 22 and the tuning connector 21; the tuning contact 22 is connected to the first parasitic branch 114, and the tuning grounding member 23 is connected to the battery compartment 12.

[0025] Based on the above configuration, the antenna impedance can be adjusted between the tuning connector 21 and the first parasitic stub 114 via the first tuning switch 25, thereby achieving antenna tuning. Furthermore, the tuning grounding component 23 connects the tuning connector 21 to the battery compartment 12, facilitating the formation of a tuning return path. It should be noted that the battery compartment 12 can be connected to the frame 11 in areas other than the gap 13, allowing the tuning connector 21 to be grounded via the battery compartment 12.

[0026] Optionally, one end of the tuning connector 21 may be provided with two spring tabs 24, which are respectively connected to the tuning contact 22 and the tuning grounding component 23. For example, the spring tabs 24 may be welded to one end of the tuning connector 21. Based on this, the elastic force of the spring tabs 24 can ensure good contact between the tuning contact 22 and the first parasitic branch 114, and good contact between the tuning grounding component 23 and the battery compartment 12.

[0027] In some embodiments, the connection between the tuning contact 22 and the first parasitic branch 114 and the first gap 111 may be spaced apart by a first distance (L3 in the figure), which allows the tuning component 20 to be misaligned with the first gap 111.

[0028] Furthermore, the gap 13, the first gap 111 and the second gap 112 are respectively filled with insulating material 14. The insulating material 14 can seal the gap 13, the first gap 111 and the second gap 112, which can play a sealing role on the one hand, and also strengthen the structural strength of the metal frame 10 on the other hand.

[0029] Furthermore, the insulating material 14 is an integral structure between the tuning contact 22 and the second gap 112. Since the first gap 111 is located between the second gap 112 and the tuning contact 22, the end of the insulating material 14 can be misaligned with the first gap 111, thus forming a complete insulating material 14 between the tuning contact 22 and the second gap 112. This can help improve the structural strength of the metal frame 10, making it easier to pass the structural strength test of the metal frame 10 and the safety test of the battery 70. In addition, it can also help reduce the peak voltage borne by the first tuning switch 25 to meet the normal use requirements of the first tuning switch 25.

[0030] It should be noted that the insulating material 14 in the gap 13 is separated by the tuning contact 22, so that complete insulating material 14 is formed on both sides of the tuning contact 22. At the same time, the tuning contact 22 is not filled with insulating material 14. Thus, if the tuning contact 22 is positioned opposite to the first gap 111, the first gap 111 will lack the support of insulating material 14, thereby reducing the structural strength of the metal frame 10. Therefore, in this embodiment, by misaligning the tuning contact 22 with the first gap 111 so that the tuning contact 22 does not cross the first gap 111, the integrity of the insulating material 14 can be avoided, thereby improving the structural strength of the metal frame 10. This allows the structural strength requirements to be met while supporting a large battery capacity of 70, further enhancing the structural strength and reliability of the electronic device.

[0031] In this embodiment, the distance between the first gap 111 and the tuning contact 22 can be set according to the structural strength requirements of the metal frame 10. Optionally, the distance (i.e., L3) between the first gap 111 and the tuning contact 22 can be 3mm to 7mm, such as 3mm, 4mm, 5mm, 6mm, 7mm, etc. Of course, other distances are also possible, which are not specifically limited here.

[0032] In addition, the portion located between the first slit 111 and the end of the gap 13 away from the second slit 112 is the first parasitic branch 114, and the length of the first parasitic branch 114 can be L2.

[0033] Optionally, the length of the main branch 113 may be greater than the length of the first parasitic branch 114.

[0034] In some embodiments, the tuning component 20 may include two second tuning switches 26, which are respectively connected to the first power supply signal circuit 30.

[0035] Optionally, the first tuning switch 25 may include multiple single-pole single-throw switches 251, and each single-pole single-throw switch 251 has a first lumped parameter device 252 connected in series in its circuit, such as... Figure 6 The diagram shown is a schematic diagram of the matching topology of the first tuning switch 25.

[0036] The first lumped parameter device 252 may include at least one of a capacitor and an inductor.

[0037] Both second tuning switches 26 are single-pole multi-throw (SPMD) switches 261. Each circuit containing an SPMD switch 261 has a second lumped parameter device 262 connected in series, such as... Figure 7 The diagram shown is a schematic diagram of the matching topology of the two second tuning switches 26.

[0038] The second lumped parameter device 262 may include at least one of a capacitor and an inductor.

[0039] In some more specific embodiments, the first tuning switch 25 can be a 4SPST switch, and the first lumped parameter device 252 connected in series on each circuit can be a capacitor. Meanwhile, the length of the first parasitic stub 114 is shorter than the length of the main stub 113. Based on this, during the process of switching the low frequency from B8 to B5 and then to B28, the first tuning switch 25 is used to synchronously switch the resonant frequency of the first parasitic stub 114 by matching capacitors of different values, making the resonant frequency higher than the low-frequency communication band. Simultaneously, the aforementioned capacitor can adjust the resonant frequency of the first parasitic stub 114 when used in the mid-to-high frequency range, causing the resonant frequency to fall outside the mid-to-high frequency band, thereby helping to reduce the impact on the mid-to-high frequency range.

[0040] In some more specific embodiments, both second tuning switches 26 can be SP4T switches. The reason for using two SP4T switches in combination is that the antenna needs to cover at least the low-frequency B5 / B8 / B28 and the mid-to-high-frequency B3 / B39 / B1 / B40 / B41, and can even provide an auxiliary state to optimize the performance of the N78 / N79 band when the second parasitic branch 115 is operating in the N78 / N79 band. Therefore, when there are relatively many communication frequency bands, a single switch state is not conducive to meeting the needs of multi-band communication switching.

[0041] Furthermore, the two SP4T switches can be used in at least four-way series connection and four-way parallel connection. This is because, for low frequencies, the original impedance falls at the boundary between the second and third quadrants, requiring a matching topology of series capacitors followed by parallel inductors to switch different frequency bands by changing different capacitor values. For mid-to-high frequencies, the low-frequency topology can be reused, and the matching topology of series capacitors, parallel inductors, and series capacitors can be used to switch the mid-to-high frequency to the corresponding communication frequency band.

[0042] Furthermore, the advantages of using two SP4T switches are as follows: Due to the pin definition limitations of tuning switches, when more than three SP4T switches are used in series, they are prone to crossing during PCB layout routing, requiring skip-layer routing. This crossing can easily cause parasitic effects that affect matching losses, and skip-layer vias can increase insertion losses, among other disadvantages. Therefore, selecting two of each SP4T switch for series use to form a four-way series configuration can both meet tuning requirements and facilitate PCB routing.

[0043] Based on the above, the embodiments of this application adopt the topology of the second tuning switch 26, which is beneficial to realize multi-band antenna switching, and also facilitates the layout and routing of traces on the PCB, reducing the matching loss of the second tuning switch 26.

[0044] Furthermore, based on the matching topology of the first tuning switch 25, the matching topology of the two second tuning switches 26, and the aforementioned main branch 113 and first parasitic branch 114, the antenna can cover low frequencies from 0.7GHz to 0.96GHz and mid-to-high frequencies from 1.71GHz to 2.69GHz, thus covering LTE bands B28 / B5 / B8 / B3 / B1 / B39 / B40 / B41. It should be noted that since most LTE and NR bands share the same frequency, this will not be elaborated upon here.

[0045] Furthermore, the topology of the first tuning switch 25 and the two second tuning switches 26 can also take other forms, as long as they can achieve complete matching of low and mid-high frequencies; the specific form is not limited. The frequency bands mentioned in the embodiments of this application are merely illustrative examples, and different standard frequency bands at the same frequency can also be included, such as B41 and N41, etc.

[0046] Example 1, using Band 8 as an example for low frequency, illustrates the antenna mechanism.

[0047] refer to Figure 8 The antenna operates at low frequency B8 with return loss (S11). The first resonance is obtained by switching the two second tuning switches 26 to match the antenna impedance, and the second resonance is obtained by switching the first tuning switch 25 to perform aperture tuning. The resonant frequency of the second resonance is higher than B8. Figure 9 The diagram shows the current distribution at 0.9 GHz. A strong current flows through the main stub 113, and a current in the same direction as the main stub 113 also exists on the first parasitic stub 114. This increases the low-frequency radiation aperture, thereby improving the efficiency of B8 (i.e., the low-frequency operating mode is a quarter-mode single-stage mode of the main stub 113 + a quarter-mode common-mode parasitic mode). Similarly, switching the two second tuning switches 26 to perform impedance tuning of the antenna makes the first resonance operate at B5. Simultaneously, switching the first tuning switch 25 to perform aperture tuning makes the second resonant frequency higher than B5, which improves the efficiency of B5. Likewise, the adjustment of B28 can also be done in the same way, which will not be elaborated here.

[0048] Furthermore, the first tuning switch 25 can be configured with multi-path lumped parameter matching, such as capacitor (0.3pF to 10pF) or inductor (10nH to 100nH).

[0049] In addition, the value range of the second lumped parameter device 262 of the second tuning switch 26 can be higher than the value range of the first lumped parameter device 252 of the first tuning switch 25.

[0050] For example, by adjusting the values ​​of the second lumped parameter devices 262 of the two second tuning switches 26, the impedance of the two second tuning switches 26 at B8 is adjusted to approximately 50 ohms, meaning the resonant frequency falls within the B8 band. Then, the value of the first lumped parameter device 252 of the first tuning switch 25 is adjusted so that the resonant frequency of the first parasitic stub 114 falls within a frequency band higher than B8. The purpose of this design is to ensure that the first parasitic stub 114 generates a unidirectional current, which can improve antenna performance. Conversely, if the resonance of the first parasitic stub 114 is lower than or exactly falls within the B8 frequency band, the efficiency within the B8 band will decrease, and a reverse current will appear on the first parasitic stub 114. Furthermore, the tuning of the resonant frequency of the first parasitic stub 114, after lumped parameter matching, ensures that the resonance formed by its electrical dimensions is higher than the communication frequency band.

[0051] Example 2, using B1 as an example for mid-to-high frequency, illustrates the antenna mechanism.

[0052] refer to Figure 10 The antenna operates at return loss B1. This resonance is achieved by switching the two second tuning switches 26 to match the antenna impedance. The first tuning switch 25 can be switched to a capacitor-to-ground state to reduce the impact on mid-to-high frequencies. Specifically, when the length of the first parasitic stub 114 is close to that of the main stub 113, inefficient resonant modes (e.g., reverse current modes) are easily generated within the mid-to-high frequency band, causing efficiency loss. Therefore, in this embodiment, the first tuning switch 25 is matched with a capacitor so that its electrical dimension's resonance falls outside the mid-to-high frequency band, thereby reducing the impact on mid-to-high frequencies.

[0053] To meet the requirement of switching capacitors back to ground, the length of the first parasitic stub 114 can be smaller than that of the main stub 113. Thus, during the low-frequency switching from B8 to B5 and then to B28, the first tuning switch 25 uses capacitors of different values ​​to switch its resonance, which is always higher than the communication frequency band. At the same time, the capacitor of the first tuning switch 25 can be used to adjust the resonant frequency of the first parasitic stub 114 to fall outside the mid-high frequency band when used in the mid-high frequency range, thereby reducing the impact on the mid-high frequency range.

[0054] refer to Figure 11 The diagram shows the current distribution at 2GHz. The current is mainly distributed on the main branch 113, and it is weakest at both ends of the main branch 113 and strongest in the middle region. That is, when the antenna is working at high frequencies, it presents a single-stage half-wave mode. This half-wave mode intersects with the 1 / 4-wave mode and has a larger radiation aperture, which can obtain higher antenna performance. The frequency bands B3 / B39 / B40 / B41 can be adjusted to the corresponding frequency bands by impedance tuning through two second tuning switches 26.

[0055] In some embodiments, the metal frame 10 may form a second parasitic branch 115 of the antenna on the side of the second slot 112 away from the first slot 111. The second parasitic branch 115 may have a second feed point 1151 in the region near the second slot 112. The second feed point 1151 is connected to the second feed signal circuit 40.

[0056] Optionally, the length of the second parasitic branch 115 can be L4, the second power supply point 1151 can be located at a distance L5 from the second gap 112, and the length of L4 is greater than the length of L5.

[0057] The distance between the second feed point 1151 and the second gap 112 can be 1 / 4 wavelength of the mid-to-high frequency (i.e., the third frequency band). The mid-to-high frequency range can be 3.3 GHz to 3.8 GHz, i.e. the N78 frequency band, or 4.8 GHz to 4.9 GHz, i.e. the N79 frequency band.

[0058] In this embodiment, by adjusting the first tuning switch 25 and the two second tuning switches 26, the first power supply and main stub 113 can be made to operate in the B41 frequency band. Simultaneously, by adjusting the length of the second parasitic stub 115, the resonant frequency of the second parasitic stub 115 is made close to B41, i.e., near B41. Figure 13 The return loss shown is generated by the first resonance of the main stub 113 and the second resonance of the second parasitic stub 115. Thus, the bandwidth of B41 can be extended by dual-mode coverage, the matching loss of B41 can be reduced and the antenna radiation efficiency can be improved. At the same time, the second parasitic stub 115 where N79 is located can be reused to increase the radiation aperture of B41 and improve the antenna performance.

[0059] In some embodiments, the first tuning switch 25 can be switched using a capacitor to make the mode generated by the first parasitic stub 114 fall outside the band of B41, reducing its impact on the performance of B41; at the same time, the two second tuning switches 26 switch the values ​​of the lumped parameter devices so that the impedance of B41 is close to 50 ohms. At this time, by adjusting the length of the second parasitic stub 115, the second resonance can be made to be higher than the frequency band of B41.

[0060] The advantage of the above design method is that, for example, Figure 13 As shown, the dual-resonant mode has a wider bandwidth, a smaller reflection coefficient, and lower reflection loss, which can improve antenna efficiency. Figure 14 This is a half-wave mode, characterized by a half-wave pattern of the length of the first parasitic spur 114, and is considered a high-efficiency mode. Figure 15 The loop pattern, characterized by the sum of the lengths of the first parasitic segment 114 and the second parasitic segment 115, is an inefficient pattern. Therefore, it makes... Figure 15 The frequency of the resonant mode is higher than Figure 14 The resonant mode in which it is located is chosen to reduce the impact on the performance of B41.

[0061] In some embodiments, the second power supply signal circuit 40 may be connected in series with a filter 40a. The number of filters 40a connected in series can be set according to actual needs, and there may be one or more.

[0062] Specifically, taking the second parasitic stub 115 operating at N79 as an example, the working mechanism of the entire antenna system is explained. For example... Figure 16 As shown, two filters 40a are connected in series in the second feed signal circuit 40, namely, the first-stage filter 41 and the second-stage filter 42. Optionally, both the first-stage filter 41 and the second-stage filter 42 can be LC filters. The first-stage LC filter effectively improves the isolation of N79 from low frequencies (0.7GHz to 1GHz) with a large inductor at low frequencies, while the second-stage LC filter effectively improves the isolation of N79 from mid-to-high frequencies (1.7GHz to 2.7GHz) with a small capacitor or a large inductor at mid-to-high frequencies. Simultaneously, the two second tuning switches 26 improve the isolation of N79 by grounding their internal small switches. Furthermore, the second lumped parameter device 262 can match the impedance of N79 in the frequency band to achieve better bandwidth, such as... Figure 17 As shown, and to achieve higher antenna efficiency, such as Figure 18 As shown.

[0063] Based on the above configuration, this embodiment of the application can integrate more antenna communication frequency bands without increasing the number of gaps in the metal frame 10 by adding a second parasitic branch 115, and reuse the branch where the new frequency band is located, thereby further improving the bandwidth and radiation efficiency of the same frequency band.

[0064] With the stringent requirements of 0mmbod SAR regulations for human electromagnetic exposure radiation, antennas need to incorporate sensors to detect human proximity in order to reduce antenna output power and thus meet SAR requirements. However, sensors impose mandatory requirements on antenna characteristics, including the requirement that the antenna cannot be directly grounded but must be grounded through a capacitor; in addition, when other adjacent antennas need to reuse sensors, the hot spot must be within the sensor's sensing range. This increases the difficulty of integrating sensors into antennas, especially for electronic devices with multiple-input multiple-output (MIMO) antennas, where a single sensor is difficult to meet these requirements.

[0065] Based on the above, the electronic device in this embodiment may further include a detection circuit 50 for detecting whether a living organism exists around the electronic device. This detection circuit 50 is connected to the first power supply point 1131. Figure 19 As shown, the detection circuit 50 is connected to the main branch 113. The organism may include a hand, face, etc.

[0066] Based on the above configuration, the detection circuit 50 is introduced through low-frequency branches (including the main branch 113 and the first parasitic branch 114), the main branch 113 is floating (or connected in series with capacitors), and the low-frequency branches are reused in the mid-to-high frequency range. This achieves the purpose of multiplexing the detection circuit 50 in multiple frequency bands (i.e., low frequency and mid-to-high frequency), effectively solving the problem that the sensing range cannot cover the low-frequency hot spot area when the sensor is placed on the mid-to-high frequency power line.

[0067] In addition, the length of the second feed antenna formed by the second parasitic branch 115 is less than the length of the first feed antenna composed of the main branch 113 and the first parasitic branch 114, which makes the second feed antenna shorter and allows the detection circuit 50 to be reused, so that the sensing range of the detection circuit 50 can cover the hot spot range of the second feed antenna.

[0068] Therefore, the embodiments of this application can meet the use of full-band antennas through the shared detection circuit 50, which better meets the relevant regulations and antenna performance requirements, and there is no need to set up multiple detection circuits 50 separately, which can save costs and reduce the space occupied.

[0069] It should be noted that the specific structure and detection principle of the detection circuit 50 can be referred to the existing technology, and will not be elaborated here.

[0070] In addition, the main branch 113 can be set in the middle area of ​​the electronic device. Based on this, the detection circuit 50 can be located in the middle area of ​​the electronic device, so that the detection circuit 50 will not be triggered when the user holds the electronic device horizontally, thereby allowing the antenna to output signals with normal power to achieve better communication effect.

[0071] Optionally, an inductor may be connected between the detection circuit 50 and the first feed point 1131 to improve the impact of the detection circuit 50 on the antenna performance.

[0072] In summary, the embodiments of this application can reasonably arrange the antenna while meeting the structural strength requirements of a large battery with a capacity of 70, reusing the antenna structure and space, and integrating more communication frequency bands to obtain better antenna performance. In addition, by changing the connection method of the detection circuit 50, the embodiments of this application can meet the use of a full-band antenna, better meet the specified requirements and antenna performance requirements, improve the user operating experience, and save costs and space.

[0073] 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: Metal frame (10) and tuning assembly (20); The metal frame (10) has a gap (13), and the metal frame (10) has a first slit (111) and a second slit (112) on the side wall at the gap (13). The metal frame (10) forms a main branch (113) and a first parasitic branch (114) of the antenna on both sides of the first slit (111). The main branch (113) has a first feed point (1131) and the first feed point (1131) is connected to a first feed signal circuit (30). The length of the main branch (113) is 1 / 4 wavelength of the low frequency, wherein the low frequency range is 0.7 GHz to 1 GHz, and the length of the main branch (113) is 1 / 2 wavelength of the mid-high frequency, wherein the mid-high frequency range is 1.7 GHz to 2.7 GHz. The tuning component (20) includes a tuning connector (21), a first tuning switch (25), and a second tuning switch (26). The first tuning switch (25) is located on the tuning connector (21). One end of the tuning connector (21) is connected to the first parasitic stub (114), and the other end of the tuning connector (21) is used to receive signals. The second tuning switch (26) is located on the first feed signal circuit (30). The antenna can be operated at different resonant frequencies by the first tuning switch (25) and the second tuning switch (26) to adapt to a variety of different communication frequency bands.

2. The electronic device according to claim 1, characterized in that, The metal frame (10) includes a frame (11) and a battery compartment (12) located inside the frame (11), and a gap (13) is formed between a partial sidewall of the frame (11) and the battery compartment (12). The tuning assembly (20) further includes a tuning contact (22) and a tuning grounding component (23) respectively disposed at one end of the tuning connector (21). The first tuning switch (25) is disposed between one end of the tuning contact (22) and the tuning connector (21). The tuning contact (22) is connected to the first parasitic branch (114), and the tuning grounding component (23) is connected to the battery compartment (12).

3. The electronic device according to claim 2, characterized in that, The connection between the tuning contact (22) and the first parasitic branch (114) is separated from the first gap (111) by a first distance; The gap (13), the first gap (111) and the second gap (112) are respectively filled with insulating material (14).

4. The electronic device according to claim 1, characterized in that, The length of the main branch (113) is greater than the length of the first parasitic branch (114).

5. The electronic device according to claim 1, characterized in that, The tuning component (20) includes two second tuning switches (26), which are respectively connected to the first power supply signal circuit (30).

6. The electronic device according to claim 5, characterized in that, The first tuning switch (25) includes a plurality of single-pole single-throw switches (251), and each of the single-pole single-throw switches (251) is connected in series with a first lumped parameter device (252), which includes at least one of a capacitor or an inductor. And / or, both of the second tuning switches (26) are single-pole multi-throw switches (261), each circuit in which the single-pole multi-throw switch (261) is located is connected in series with a second lumped parameter device (262), the second lumped parameter device (262) including at least one of a capacitor or an inductor.

7. The electronic device according to claim 6, characterized in that, The value range of the second lumped parameter device (262) is higher than the value range of the first lumped parameter device (252).

8. The electronic device according to any one of claims 1 to 7, characterized in that, The metal frame (10) forms a second parasitic branch (115) of the antenna on the side of the second gap (112) away from the first gap (111). The second parasitic branch (115) has a second feed point (1151) in the area near the second gap (112). The second feed point (1151) is connected to the second feed signal circuit (40).

9. The electronic device according to claim 8, characterized in that, The second power supply signal circuit (40) is connected in series with a filter device (40a).

10. The electronic device according to claim 8, characterized in that, The distance between the second feed point (1151) and the second gap (112) is 1 / 4 wavelength of the mid-to-high frequency, wherein the mid-to-high frequency range is 3.3 GHz to 3.8 GHz, or 4.8 GHz to 4.9 GHz.

11. The electronic device according to any one of claims 1 to 7, characterized in that, The electronic device also includes a detection circuit (50) for detecting whether there is a living organism around the electronic device; The detection circuit (50) is connected to the first power supply point (1131).

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