Middle frame assembly and electronic device

Abstract

The present disclosure relates to a middle frame assembly and an electronic device, wherein the middle frame assembly comprises a middle frame and an impedance switching circuit, the middle frame comprises a support part and a bezel surrounding the support part, a gap is arranged on the bezel, the bezel on one side of the gap constitutes a first antenna radiator, and the bezel on the other side of the gap constitutes a second antenna radiator; the impedance switching circuit is arranged between the first antenna radiator and the second antenna radiator, and is used for switching between inductive impedance and capacitive impedance. In this way, the antenna performance of a specific frequency band can be effectively improved while realizing the miniaturized design of the antenna.

Description

Technical Field

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

[0002] As electronic devices become increasingly thinner and lighter, more and more electronic devices are using the metal frame of the mid-frame to implement multi-band antenna designs in order to save internal space. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides a mid-frame component and an electronic device.

[0004] According to a first aspect of this disclosure, a mid-frame assembly is provided, comprising: a mid-frame including a support portion and a frame surrounding the support portion, the frame having a slit, the frame on one side of the slit constituting a first antenna radiator, and the frame on the other side of the slit constituting a second antenna radiator; and an impedance switching circuit disposed between the first antenna radiator and the second antenna radiator, the impedance switching circuit being used to switch between inductive impedance and capacitive impedance. By switching between inductive and capacitive impedance through the impedance switching circuit, the first antenna radiator and the second antenna radiator can cooperate with each other, realizing branch multiplexing of the first and second antenna radiators, enabling different frequency bands to operate in intrinsic mode, thereby improving the performance of a specific frequency band within a limited antenna size, and thus effectively improving antenna performance in a specific frequency band while achieving antenna miniaturization design.

[0005] In some embodiments of this disclosure, the first antenna radiator and the second antenna radiator are configured to operate in a first frequency band when the impedance switching circuit is at the capacitive impedance and in a second frequency band when the impedance switching circuit is at the inductive impedance, wherein the first frequency band is greater than the second frequency band. This allows both the first and second frequency bands to operate in intrinsic mode, thereby effectively improving the antenna performance of both bands within a limited antenna size.

[0006] In some embodiments of this disclosure, the impedance switching circuit includes: a first switching switch, the first end of which is connected to a first connection point on the first antenna radiator; a first branch, the first end of which is connected to a second end of the first switching switch, and the second end of which is connected to a second connection point on the second antenna radiator, wherein an inductor is disposed on the first branch; and a second branch, the first end of which is connected to a third end of the first switching switch, and the second end of which is connected to the second connection point on the second antenna radiator, wherein a capacitor is disposed on the second branch; wherein the first switching switch is configured to switch the connection of its first end between its second and third ends. This simplifies the structure of the impedance switching circuit and facilitates its production and processing.

[0007] In some embodiments of this disclosure, the first switching switch further includes an open-circuit terminal. The first switching switch is configured to switch the connection of its first terminal between its second terminal, third terminal, and open-circuit terminal. When the first terminal of the first switching switch is connected to the open-circuit terminal, the first antenna radiator is disconnected from the second antenna radiator. This facilitates antenna design across more frequency bands, allowing for selection of the on / off state between the first and second antenna radiators as needed. This ensures that the performance of each frequency band can operate in intrinsic mode, further improving the antenna performance of each frequency band.

[0008] In some embodiments of this disclosure, the mid-frame assembly further includes: a first matching circuit connected to the first connection point; and a second matching circuit connected to the second connection point. This enables tuning of the first and second antenna radiators, which is beneficial for improving the radiation efficiency of both antenna radiators.

[0009] In some embodiments of this disclosure, the first matching circuit includes: a first inductor, with a first end connected to the first connection point; a first capacitor, with a first end connected to a second end of the first inductor; a second inductor connected to the second end of the first capacitor; one end of the second capacitor connected between the first inductor and the first connection point, and the other end grounded; a third inductor, with one end connected between the first capacitor and the second inductor, and the other end grounded; and a first matching component, including a second switching switch, a first matching inductor, a second matching inductor, and a third matching inductor, wherein one end of the second switching switch is connected between the first capacitor and the third inductor, one end of the first matching inductor is connected to the second switching switch and the other end grounded, one end of the second matching inductor is connected to the second switching switch and the other end grounded, and one end of the third matching inductor is connected to the second switching switch and the other end grounded. This allows the first matching circuit to specifically tune the first antenna radiator according to the connection state between the first antenna radiator and the second antenna radiator, thereby further improving the antenna performance in a specific frequency band.

[0010] In some embodiments of this disclosure, the second matching circuit includes: a fourth inductor, the first end of which is connected to the second connection point; a third capacitor, the first end of which is connected to the second end of the fourth inductor; a fifth inductor connected to the second end of the third capacitor; a fourth capacitor, one end of which is connected between the fourth inductor and the first connection point, and the other end grounded; a sixth inductor, one end of which is connected between the third capacitor and the fifth inductor, and the other end grounded; and a second matching component, the second matching component including a third switching switch, a fourth matching inductor, a fifth matching inductor, and a sixth matching inductor, wherein one end of the third switching switch is connected between the third capacitor and the sixth inductor, one end of the fourth matching inductor is connected to the third switching switch and the other end grounded, one end of the fifth matching inductor is connected to the third switching switch and the other end grounded, and one end of the sixth matching inductor is connected to the third switching switch and the other end grounded. In this way, the second matching circuit can specifically tune the second antenna radiator according to the connection state between the first and second antenna radiators, thereby further improving the antenna performance in a specific frequency band.

[0011] In some embodiments of this disclosure, one of the first antenna radiator and the second antenna radiator is an IFA antenna, and the other of the first antenna radiator and the second antenna radiator is a T antenna. A T antenna can be used to further improve the antenna performance of each frequency band, while an IFA antenna can be used to realize the multi-band antenna design of electronic devices.

[0012] In some embodiments of this disclosure, the IFA antenna is provided with a first feed point, which is connected to a first feed source. The impedance switching circuit is connected to the first antenna radiator between the first feed point and the gap. This simplifies the structure of the mid-frame and facilitates production and processing.

[0013] In some embodiments of this disclosure, the T-antenna is provided with a second feed point, which is connected to a second feed source. The impedance switching circuit is connected to the second antenna radiator between the second feed point and the gap. This simplifies the structure of the mid-frame and facilitates production and processing.

[0014] In some embodiments of this disclosure, the first frequency band is the MHB band; the second frequency band is the LB band. This allows the electronic device to simultaneously support both the MHB and LB bands, and by switching between inductive and capacitive impedance via an impedance switching circuit, both the MHB and LB bands can operate in intrinsic mode, thereby effectively improving the antenna performance of the electronic device.

[0015] In some embodiments of this disclosure, the frame includes a side frame, and both the first antenna radiator and the second antenna radiator are located on the side frame. This avoids obstruction of the first and second antenna radiators when the user uses the device in landscape mode, thereby improving the antenna performance of the first and second antenna radiators and enhancing the user experience.

[0016] According to a second aspect of this disclosure, an electronic device is provided, the electronic device including a mid-frame assembly as described in the first aspect. Using the mid-frame assembly as described in the first aspect enables performance improvements in a specific frequency band within a limited antenna size, thereby facilitating antenna miniaturization and consequently miniaturization of the electronic device, while effectively improving antenna performance in a specific frequency band.

[0017] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0018] The mid-frame assembly provided in this disclosure has a slit on its frame. The frame on one side of the slit forms a first antenna radiator, and the frame on the other side of the slit forms a second antenna radiator. An impedance switching circuit is provided between the first and second antenna radiators. By switching between inductive and capacitive impedance through the impedance switching circuit, the first and second antenna radiators can cooperate with each other to improve the performance of a specific frequency band within a limited antenna size. This effectively improves the antenna performance of a specific frequency band while achieving antenna miniaturization design.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0021] Figure 1 This is a schematic diagram of the structure of a mid-frame component according to an exemplary embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of a first matching circuit according to an exemplary embodiment;

[0023] Figure 3 This is a schematic diagram of the structure of a second matching circuit according to an exemplary embodiment;

[0024] Figure 4 This is a schematic diagram of the structure of an electronic device according to an exemplary embodiment.

[0025] In the picture:

[0026] 10-Mid-frame assembly; 101-Side frame; 102-IFA antenna; 1021-Grounding rib location; 103-T antenna; 11-First antenna radiator; 111-First feed point; 12-Second antenna radiator; 121-Second feed point; 13-Gap; 14-Impedance switching circuit; 141-First switching switch; 142-First branch; 1421-Inductor; 143-Second branch; 1431-Capacitor; 15-First matching circuit; 151-Second switching switch; 16-Second matching circuit; 161-Third switching switch; 17-First feed source; 18-Second feed source; 20-Electronic equipment. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0028] As electronic devices become increasingly thinner and lighter, more and more devices are utilizing the metal frame of the mid-frame to implement multi-band antenna designs in order to save internal space. For example, this disclosure provides an example of an electronic device with a slit in its side frame. The frame on one side of the slit constitutes a first antenna radiator, and the frame on the other side of the slit constitutes a second antenna radiator, with the first and second antenna radiators being independent of each other. In this case, due to the size limitations of the phone's frame, the first and second antenna radiators are mostly IFA antennas. Typically, one of the first and second antenna radiators is used to radiate antenna signals in the MHB band, and the other is used to radiate antenna signals in the LB band.

[0029] For the LB band, the antenna length needs to be sufficiently long, such as 80mm to 90mm, to achieve optimal radiation efficiency. However, due to the size limitations of electronic devices, the antenna length requirement for the LB band cannot be met, making it difficult for the LB band to operate in intrinsic modes, thus resulting in poor antenna performance. It should be noted that intrinsic modes refer to the electromagnetic field distribution pattern that an antenna naturally exhibits under specific conditions without external excitation; this can be understood as the antenna's optimal radiation efficiency.

[0030] For the MHB band, it inherently possesses a quarter-wavelength mode and a quarter-wavelength mode from the feed point to the end (the end refers to the end of the antenna radiator facing the slit). Relying solely on these two modes results in a narrow bandwidth for the MHB band, necessitating the addition of parasitic stubs to construct another quarter-wavelength mode to improve bandwidth. However, due to size limitations of electronic devices, it is difficult to determine a suitable length for the parasitic stubs, preventing the MHB band from operating in its intrinsic mode and resulting in poor antenna performance. The antenna design in this embodiment cannot simultaneously achieve both antenna miniaturization and antenna performance.

[0031] To address the aforementioned technical problems, another exemplary embodiment of this disclosure provides a mid-frame assembly with a slit in the frame. The frame on one side of the slit constitutes a first antenna radiator, and the frame on the other side of the slit constitutes a second antenna radiator. An impedance switching circuit is provided between the first and second antenna radiators. By switching between inductive and capacitive impedance through the impedance switching circuit, the first and second antenna radiators can cooperate with each other to improve the performance of a specific frequency band within a limited antenna size. This effectively improves the antenna performance of a specific frequency band while achieving antenna miniaturization design.

[0032] An exemplary embodiment of this disclosure provides a mid-frame component, such as Figure 1As shown, the mid-frame assembly 10 includes a mid-frame and an impedance switching circuit 14. The mid-frame includes a support portion and a frame surrounding the support portion. A slit 13 is provided on the frame. The frame on one side of the slit 13 constitutes a first antenna radiator 11, and the frame on the other side of the slit 13 constitutes a second antenna radiator 12. The impedance switching circuit 14 is disposed between the first antenna radiator 11 and the second antenna radiator 12. The impedance switching circuit 14 is used to switch between inductive impedance and capacitive impedance. That is, the impedance switching circuit 14 includes a switching switch and inductive and capacitive impedances connected to the switching switch. For example, the inductive impedance can be a passive device, such as an inductor, or it can be an inductive circuit containing at least two electrically connected passive devices. No specific limitation is made here. Similarly, the capacitive impedance can be a passive device, such as a capacitor, or it can be a capacitive circuit containing at least two electrically connected passive devices. No specific limitation is made here, and it can be configured as desired.

[0033] When the impedance switching circuit 14 switches to inductive impedance, the first antenna radiator 11 and the second antenna radiator 12 are connected via inductive impedance. In this case, the first antenna radiator 11 and the second antenna radiator 12 can cooperate to improve the antenna performance in a specific frequency band. When the impedance switching circuit 14 switches to capacitive impedance, the first antenna radiator 11 and the second antenna radiator 12 are connected via capacitive impedance. In this case, the first antenna radiator 11 and the second antenna radiator 12 can cooperate to improve the antenna performance in another specific frequency band.

[0034] It should be noted that the first antenna radiator 11 and the second antenna radiator 12 can be used in combination. For example, one of the first antenna radiator 11 and the second antenna radiator 12 can be used as a parasitic stub of the other, or the first antenna radiator 11 and the second antenna radiator 12 can be connected to form a single antenna radiator, effectively increasing the size of the antenna radiator. In this way, the stub of the first antenna radiator 11 and the second antenna radiator 12 can be multiplexed through the switching of the impedance switching circuit 14, allowing different frequency bands to operate in intrinsic mode, effectively improving antenna performance. At the same time, it can also effectively reduce the antenna size, realizing the miniaturization design of the antenna, which is beneficial to the miniaturization design of the electronic device 20.

[0035] Improving antenna performance in a specific frequency band, for example, could be the MHB band, LB band, UWB band, N78 band, N79 band, etc., without being specifically limited here.

[0036] In this embodiment, by setting an impedance switching circuit 14 between the first antenna radiator 11 and the second antenna radiator 12, the impedance switching circuit 14 switches between inductive impedance and capacitive impedance, so that the first antenna radiator 11 and the second antenna radiator 12 can cooperate with each other to improve the performance of a specific frequency band with a limited antenna size. Thus, while realizing the miniaturization design of the antenna, the antenna performance of a specific frequency band can be effectively improved.

[0037] In one embodiment, combined with Figure 1 The first antenna radiator 11 and the second antenna radiator 12 are configured to operate in the first frequency band when the impedance switching circuit 14 is in capacitive impedance. That is, when the electronic device 20 needs to use the antenna signal of the first frequency band, the impedance switching circuit 14 switches to capacitive impedance, and the first antenna radiator 11 and the second antenna radiator 12 are connected through capacitive impedance, so that the first antenna radiator 11 and the second antenna radiator 12 cooperate to make the first frequency band operate in intrinsic mode, effectively improving the antenna performance of the first frequency band.

[0038] Furthermore, the first antenna radiator 11 and the second antenna radiator 12 are configured to operate in the second frequency band when the impedance switching circuit 14 is inductively impedanceed. That is, when the electronic device 20 needs to use the antenna signal of the second frequency band, the impedance switching circuit 14 switches to inductive impedance, and the first antenna radiator 11 and the second antenna radiator 12 are connected through the inductive impedance, so that the first antenna radiator 11 and the second antenna radiator 12 cooperate to make the second frequency band operate in intrinsic mode, effectively improving the antenna performance of the second frequency band.

[0039] The first frequency band is greater than the second frequency band. For example, the first frequency band can be the MHB band and the second frequency band can be the LB band, or the first frequency band can be the UHB band or the UWB band, and the second frequency band can be the N78 band, the N79 band, etc.

[0040] This allows both the first and second frequency bands to operate in intrinsic mode, thereby effectively improving the antenna performance of both bands within a limited antenna size.

[0041] like Figure 1 As shown, in one embodiment, the impedance switching circuit 14 includes a first switching switch 141, a first branch 142, and a second branch 143. The first end of the first switching switch 141 is connected to a first connection point on the first antenna radiator 11. Understandably, the first connection point refers to the connection point where the first switching switch 141 is connected to the first antenna radiator 11, such as the tuning point of the first antenna radiator 11.

[0042] The first end of the first branch 142 is connected to the second end of the first switch 141, and the second end of the first branch 142 is connected to the second connection point on the second antenna radiator 12. Understandably, the second connection point refers to the connection point where the second end of the first branch 142 connects to the second antenna radiator 12, such as the tuning point of the second antenna radiator 12. An inductor 1421 is provided on the first branch 142, making the first branch 142 inductively coupled.

[0043] The first end of the second branch 143 is connected to the third end of the first switching switch 141, and the second end of the second branch 143 is connected to the second connection point on the second antenna radiator 12. A capacitor element 1431 is provided on the second branch 143, and at this time, the second branch 143 is capacitive.

[0044] The first switch 141 is configured to switch its first terminal between its second and third terminals. When the first switch 141 connects its first terminal to its second terminal, the first antenna radiator 11 and the second antenna radiator 12 are connected via the first branch 142, thereby improving the performance of the second frequency band. When the first switch 141 connects its first terminal to its third terminal, the first antenna radiator 11 and the second antenna radiator 12 are connected via the second branch 143, thereby improving the performance of the first frequency band.

[0045] This configuration simplifies the structure of the impedance switching circuit 14, making it easier to manufacture and process.

[0046] In one embodiment, the first switching switch 141 further includes an open-circuit terminal. The first switching switch 141 is configured to switch the connection of its first terminal between its second terminal, third terminal, and open-circuit terminal. When the first terminal of the first switching switch 141 is connected to the open-circuit terminal, the first antenna radiator 11 is disconnected from the second antenna radiator 12. At this time, the first antenna radiator 11 and the second antenna radiator 12 are independent of each other and can radiate signals independently. This facilitates the design of antennas for more frequency bands, allowing the switching between the first antenna radiator 11 and the second antenna radiator 12 to be selected as needed, thereby enabling the performance of each frequency band to operate in intrinsic mode and further improving the antenna performance of each frequency band.

[0047] Continue to refer to Figure 1In one embodiment, the mid-frame assembly 10 further includes a first matching circuit 15 and a second matching circuit 16. The first matching circuit 15 is connected to the first connection point. By tuning the first antenna radiator 11 through the first matching circuit 15, the signal transmission efficiency of the first antenna radiator 11 can be improved, thereby helping to improve the radiation efficiency of the first antenna radiator 11.

[0048] The second matching circuit 16 is connected to the second connection point. By tuning the second antenna radiator 12 through the second matching circuit 16, the signal transmission efficiency of the second antenna radiator 12 can be improved, thereby helping to improve the radiation efficiency of the second antenna radiator 12.

[0049] In this embodiment, the stub length λ0 of the antenna radiator is affected by the resonant frequency f0 and the dielectric constant ε of the surrounding medium. r The effect satisfies the formula: Where λ0 represents the stub length of the antenna, f0 represents the resonant frequency, and ε r The dielectric constant of the surrounding medium (the plastic of the middle frame) is represented by c, and the speed of light is represented by c. The length of the antenna radiator required for a specific frequency band is calculated using the above formula. Through the coordination of the first matching circuit, the second matching circuit, and the impedance switching circuit, the specific frequency band can operate in eigenmode, thus improving the antenna performance of the electronic device.

[0050] like Figure 1 and Figure 2 As shown, in one embodiment, the first matching circuit 15 includes a first inductor L1, a first capacitor C1, a second inductor L2, a second capacitor C2, a third inductor L3, and a first matching component. The first end of the first inductor L1 is connected to a first connection point on the first antenna radiator 11. The first end of the first capacitor C1 is connected to the second end of the first inductor L1. The second inductor L2 is connected to the second end of the first capacitor C1. One end of the second capacitor C2 is connected between the first inductor L1 and the first connection point, and the other end is grounded. One end of the third inductor L3 is connected between the first capacitor C1 and the second inductor L2, and the other end is grounded.

[0051] Since the first switch 141 is configured to switch the connection between its first terminal and its second, third, and open terminals, the first antenna radiator 11 and the second antenna radiator 12 can have three connection states: connected via inductive impedance, connected via capacitive impedance, and disconnected. Based on this, the first matching component includes a second switch 151, a first matching inductor L11, a second matching inductor L12, and a third matching inductor L13. One end of the second switch 151 is connected between the first capacitor C1 and the third inductor L3. One end of the first matching inductor L11 is connected to the second switch 151, and the other end is grounded. One end of the second matching inductor L12 is connected to the second switch 151, and the other end is grounded. One end of the third matching inductor L13 is connected to the second switch 151, and the other end is grounded. The first matching inductor L11, the second matching inductor L12, and the third matching inductor L13 are respectively connected to different terminals of the second switch 151. This configuration allows the first matching circuit 15 to specifically tune the first antenna radiator 11 based on the connection status between the first antenna radiator 11 and the second antenna radiator 12, thereby further improving the antenna performance in a specific frequency band.

[0052] like Figure 1 and Figure 3 As shown, in one embodiment, the second matching circuit 16 includes a fourth inductor L4, a third capacitor C3, a fifth inductor L5, a fourth capacitor C4, a sixth inductor L6, and a second matching component. The first terminal of the fourth inductor L4 is connected to a second connection point on the second antenna radiator 12. The first terminal of the third capacitor C3 is connected to the second terminal of the fourth inductor L4. The fifth inductor L5 is connected to the second terminal of the third capacitor C3. One end of the fourth capacitor C4 is connected between the fourth inductor L4 and the first connection point, and the other end is grounded. One end of the sixth inductor L6 is connected between the third capacitor C3 and the fifth inductor L5, and the other end is grounded.

[0053] Since the first switching switch 141 is configured to switch the connection between its first terminal and its second, third, and open terminals, the first antenna radiator 11 and the second antenna radiator 12 can have three connection states: connected via inductive impedance, connected via capacitive impedance, and disconnected. Based on this, the second matching assembly includes a third switching switch 161, a fourth matching inductor L14, a fifth matching inductor L15, and a sixth matching inductor L16. One end of the third switching switch 161 is connected between the third capacitor C3 and the sixth inductor L6. One end of the fourth matching inductor L14 is connected to the third switching switch 161, and the other end is grounded. One end of the fifth matching inductor L15 is connected to the third switching switch 161, and the other end is grounded. One end of the sixth matching inductor L16 is connected to the third switching switch 161, and the other end is grounded. The fourth matching inductor L14, the fifth matching inductor L15, and the sixth matching inductor L16 are respectively connected to different terminals of the third switching switch 161. This configuration allows the second matching circuit 16 to specifically tune the second antenna radiator 12 based on the connection status between the first antenna radiator 11 and the second antenna radiator 12, thereby further improving the antenna performance in a specific frequency band.

[0054] Because T-antennas require a longer antenna length than IFA antennas, it is difficult to mount T-antennas on the frame due to frame size limitations in related technologies. For example... Figure 1 As shown, in one embodiment of this disclosure, the impedance switching circuit 14 switches between inductive and capacitive impedance, allowing the first antenna radiator 11 and the second antenna radiator 12 to cooperate with each other. This enables performance enhancement for a specific frequency band within a limited antenna size, effectively reducing the size design requirements of the T-antenna. Thus, in this embodiment, one of the first antenna radiator 11 and the second antenna radiator 12 is an IFA antenna 102, and the other is a T-antenna 103. Exemplarily, the first antenna radiator 11 can be an IFA antenna 102, and the second antenna radiator 12 can be a T-antenna 103, or vice versa; no specific limitation is made. With this design, the T-antenna 103 can be used to further improve the antenna performance of each frequency band, while the IFA antenna 102 can be used to achieve multi-band antenna design for the electronic device 20.

[0055] Understandably, IFA antenna 102 has a grounding rib position 1021, while T antenna 103 does not have a grounding rib position.

[0056] like Figure 1As shown, in one embodiment, the IFA antenna 102 is provided with a first feed point 111, which is connected to the first feed source 17. The impedance switching circuit 14 is connected to the first antenna radiator 11 between the first feed point 111 and the gap 13. The first feed point 111 can be used to feed both the first and second frequency bands. When the IFA antenna 102 operates in the first frequency band, the impedance switching circuit 14 connects the first antenna radiator 11 and the second antenna radiator 12 through a capacitive impedance, making the T antenna 103 a parasitic branch of the IFA antenna, thereby effectively improving the radiation efficiency of the first frequency band. When the IFA antenna 102 operates in the second frequency band, the impedance switching circuit 14 connects the first antenna radiator 11 and the second antenna radiator 12 through an inductive impedance, making the IFA antenna 102 and the T antenna 103 equivalent to a longer IFA antenna 102, thereby allowing the second frequency band to operate in intrinsic mode and effectively improving the performance of the second frequency band.

[0057] This design simplifies the structure of the middle frame, making it easier to manufacture and process.

[0058] like Figure 1 As shown, in another embodiment, the T antenna 103 is provided with a second feed point 121, which is connected to the second feed source 18. The connection position between the impedance switching circuit 14 and the second antenna radiator 12 is located between the second feed point 121 and the gap 13. The second feed point 121 can be used to feed both the first and second frequency bands. When the T antenna 103 operates in the first frequency band, the impedance switching circuit 14 connects the first antenna radiator 11 and the second antenna radiator 12 through a capacitive impedance, making the IFA antenna 102 a parasitic stub of the T antenna 103, thereby effectively improving the radiation efficiency of the first frequency band. When the T antenna 103 operates in the second frequency band, the impedance switching circuit 14 connects the first antenna radiator 11 and the second antenna radiator 12 through an inductive impedance, making the IFA antenna 102 and the T antenna 103 equivalent to a longer T antenna 103, thereby allowing the second frequency band to operate in intrinsic mode and effectively improving the performance of the second frequency band.

[0059] This design simplifies the structure of the middle frame, making it easier to manufacture and process.

[0060] like Figure 1As shown, in another embodiment, the IFA antenna 102 is provided with a first feed point 111, which is connected to the first feed source 17. The impedance switching circuit 14 is connected to the first antenna radiator 11 at a position between the first feed point 111 and the gap 13. The T antenna 103 is provided with a second feed point 121, which is connected to the second feed source 18. The impedance switching circuit 14 is connected to the second antenna radiator 12 at a position between the second feed point 121 and the gap 13.

[0061] In this embodiment, when the IFA antenna 102 and the T antenna 103 are connected via capacitive or inductive impedance, either the first feed point 111 or the second feed point 121 needs to be in a fed state. When the IFA antenna 102 and the T antenna 103 are in an open state, the first feed source 17 and the second feed source 18 can feed the IFA antenna 102 and the T antenna 103 respectively, so that the IFA antenna 102 and the T antenna 103 are two independent antennas, thus enabling antenna designs with more frequency bands.

[0062] In one embodiment, the first frequency band is the MHB band and the second frequency band is the LB band. This allows the electronic device 20 to simultaneously support both the MHB and LB bands, and the impedance switching circuit 14 switches between inductive and capacitive impedances, enabling both the MHB and LB bands to operate in intrinsic mode, thereby effectively improving the antenna performance of the electronic device 20.

[0063] In this embodiment, the impedance switching circuit 14, the first feed point 111 and the second feed point 121 can be controlled based on the recognition of the scene, so as to improve the antenna performance of the electronic device 20.

[0064] For example, when it is identified that the electronic device 20 currently requires an antenna signal in the MHB band, the first switching switch 141 connects the first antenna radiator 11 and the second antenna radiator 12 via a capacitive impedance, and puts either the first feed point 111 or the second feed point 121 in a fed state, thereby enabling the MHB band to operate in intrinsic mode and effectively improving the performance of the MHB band.

[0065] When it is identified that the electronic device 20 currently requires an antenna signal in the LB band, the first switching switch 141 connects the first antenna radiator 11 and the second antenna radiator 12 through an inductive impedance, and puts either the first feed point 111 or the second feed point 121 in a feeding state, thereby enabling the LB band to operate in intrinsic mode and effectively improving the performance of the LB band.

[0066] When it is identified that the electronic device 20 currently requires antenna signals of other frequency bands on the first antenna radiator 11 and / or the second antenna radiator 12, the first switching switch 141 disconnects the first antenna radiator 11 and the second antenna radiation, and puts the first feed point 111 and / or the second feed point 121 into a fed state, so that the first antenna radiator 11 and / or the second antenna radiator 12 can work independently without affecting each other.

[0067] Since the MHB and LB bands are mostly used in landscape mode, such as watching videos and playing games, based on this, such as Figure 4 As shown, in one embodiment, the frame includes a side frame 101, and the first antenna radiator 11 and the second antenna radiator 12 are both located on the side frame 101. This arrangement avoids obstruction of the first antenna radiator 11 and the second antenna radiator 12 when the user uses the device in landscape mode, thereby further improving the antenna performance of the first antenna radiator 11 and the second antenna radiator 12 and enhancing the user experience.

[0068] An exemplary embodiment of this disclosure provides an electronic device, which may be a mobile device such as a mobile phone, tablet computer, laptop computer, handheld computer, in-vehicle electronic device, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), or a non-mobile device such as a personal computer (PC) or television (TV).

[0069] like Figure 1 and Figure 4 As shown, the electronic device 20 includes the mid-frame assembly 10 as described above. The mid-frame assembly 10 includes a mid-frame and an impedance switching circuit 14. The mid-frame includes a support portion and a frame surrounding the support portion. A slit 13 is provided on the frame. The frame on one side of the slit 13 constitutes a first antenna radiator 11, and the frame on the other side of the slit 13 constitutes a second antenna radiator 12. The impedance switching circuit 14 is disposed between the first antenna radiator 11 and the second antenna radiator 12. The impedance switching circuit 14 is used to switch between inductive impedance and capacitive impedance. In this way, the first antenna radiator 11 and the second antenna radiator 12 can cooperate with each other to improve the performance of a specific frequency band within a limited antenna size, thereby effectively improving the antenna performance of a specific frequency band while achieving antenna miniaturization design.

[0070] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0071] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A mid-frame component, characterized in that, The mid-frame component includes: The middle frame includes a support portion and a frame surrounding the support portion. A slit is provided on the frame. The frame on one side of the slit constitutes a first antenna radiator, and the frame on the other side of the slit constitutes a second antenna radiator. An impedance switching circuit is disposed between the first antenna radiator and the second antenna radiator, and the impedance switching circuit is used to switch between inductive impedance and capacitive impedance.

2. The mid-frame assembly according to claim 1, characterized in that, The first antenna radiator and the second antenna radiator are configured to operate in a first frequency band when the impedance switching circuit is at the capacitive impedance and in a second frequency band when the impedance switching circuit is at the inductive impedance, wherein the first frequency band is greater than the second frequency band.

3. The mid-frame assembly according to claim 2, characterized in that, The impedance switching circuit includes: A first switching switch, the first end of which is connected to a first connection point on the first antenna radiator; The first branch has a first end connected to the second end of the first switching switch, and the second end of the first branch is connected to the second connection point on the second antenna radiator. An inductor is provided on the first branch. The second branch has a first end connected to the third end of the first switching switch, and a second end connected to the second connection point on the second antenna radiator. A capacitor element is provided on the second branch. The first switch is configured to switch the connection of its first end between its second and third ends.

4. The mid-frame assembly according to claim 3, characterized in that, The first switching switch further includes an open-circuit terminal. The first switching switch is configured to switch the connection of the first terminal of the first switching switch between the second terminal, the third terminal and the open-circuit terminal of the first switching switch. When the first terminal of the first switching switch is connected to the open-circuit terminal, the first antenna radiator is disconnected from the second antenna radiator.

5. The mid-frame assembly according to claim 3, characterized in that, The mid-frame component also includes: A first matching circuit is connected to the first connection point; A second matching circuit is connected to the second connection point.

6. The mid-frame assembly according to claim 5, characterized in that, The first matching circuit includes: A first inductor, the first end of which is connected to the first connection point; A first capacitor, wherein a first terminal of the first capacitor is connected to a second terminal of the first inductor; The second inductor is connected to the second terminal of the first capacitor; The second capacitor has one end connected between the first inductor and the first connection point, and the other end grounded. The third inductor has one end connected between the first capacitor and the second inductor, and the other end grounded; The first matching component includes a second switch, a first matching inductor, a second matching inductor, and a third matching inductor. One end of the second switch is connected between the first capacitor and the third inductor. One end of the first matching inductor is connected to the second switch and the other end is grounded. One end of the second matching inductor is connected to the second switch and the other end is grounded. One end of the third matching inductor is connected to the second switch and the other end is grounded.

7. The mid-frame assembly according to claim 5, characterized in that, The second matching circuit includes: The fourth inductor, the first end of which is connected to the second connection point; The third capacitor, the first terminal of which is connected to the second terminal of the fourth inductor; The fifth inductor is connected to the second terminal of the third capacitor; The fourth capacitor has one end connected between the fourth inductor and the first connection point, and the other end grounded. The sixth inductor has one end connected between the third capacitor and the fifth inductor, and the other end grounded; The second matching component includes a third switch, a fourth matching inductor, a fifth matching inductor, and a sixth matching inductor. One end of the third switch is connected between the third capacitor and the sixth inductor. One end of the fourth matching inductor is connected to the third switch and the other end is grounded. One end of the fifth matching inductor is connected to the third switch and the other end is grounded. One end of the sixth matching inductor is connected to the third switch and the other end is grounded.

8. The mid-frame assembly according to any one of claims 1 to 6, characterized in that, One of the first antenna radiator and the second antenna radiator is an IFA antenna, and the other of the first antenna radiator and the second antenna radiator is a T antenna.

9. The mid-frame assembly according to claim 8, characterized in that, The IFA antenna is provided with a first feed point, which is connected to a first feed source. The impedance switching circuit is connected to the first antenna radiator at a position between the first feed point and the gap.

10. The mid-frame assembly according to claim 8, characterized in that, The T-antenna is provided with a second feed point, which is connected to a second feed source. The impedance switching circuit is connected to the second antenna radiator at a position between the second feed point and the gap.

11. The mid-frame assembly according to any one of claims 2 to 6, characterized in that, The first frequency band is the MHB band; the second frequency band is the LB band.

12. The mid-frame assembly according to any one of claims 1 to 6, characterized in that, The frame includes a side frame, and both the first antenna radiator and the second antenna radiator are located on the side frame.

13. An electronic device, characterized in that, The electronic device includes a mid-frame assembly as described in any one of claims 1 to 12.

Images