Middle frame assembly and electronic device

Abstract

The present disclosure relates to a middle frame assembly and an electronic device, the middle frame assembly comprising a middle frame body and a tuning circuit, the middle frame body being provided with at least two adjacent antenna branches, a gap being provided between the adjacent antenna branches, the tuning circuit being provided at the gap and connected to the two adjacent antenna branches; wherein at least one of the two adjacent antenna branches operates in a traveling wave mode, and the tuning circuit is used for transmitting electromagnetic waves between the two adjacent antenna branches, so that one of the two adjacent antenna branches acts as a magnetic parasitic branch of the other antenna branch. The present disclosure connects the two adjacent antenna branches by providing the tuning circuit at the gap, transmits electromagnetic waves between the antenna branches, configures the two adjacent antenna branches as a magnetic parasitic mode in the same direction, generates a superimposed magnetic field in the same direction, and thus improves the radiation efficiency of the antenna.

Description

Technical Field

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

[0002] With the gradual development of electronic device technology, electronic devices are trending towards smaller thicknesses and larger screen ratios. Consequently, the design space reserved for antennas within electronic devices is becoming increasingly smaller. In related technologies, due to space constraints, the distance between antenna segments is relatively small, leading to mutual interference between antenna segments and poor antenna radiation efficiency. Utility Model Content

[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 the present disclosure, a mid-frame component is provided, the mid-frame component comprising:

[0005] The middle frame body is provided with at least two adjacent antenna stubs, and a gap is provided between the adjacent antenna stubs;

[0006] A tuning circuit is disposed at the gap, and the tuning circuit connects two adjacent antenna stubs;

[0007] In this configuration, at least one of two adjacent antenna stubs operates in traveling wave mode, and the tuning circuit is used to transmit electromagnetic waves between the two adjacent antenna stubs, so that one of the two adjacent antenna stubs acts as a magnetic parasitic stub of the other antenna stub.

[0008] In this embodiment of the disclosure, by setting a tuning circuit at the gap, two adjacent antenna stubs are connected, so that electromagnetic waves can be transmitted between the antenna stubs. The two adjacent antenna stubs are constructed into a co-directional magnetic parasitic mode, generating a co-directional superimposed magnetic field, thereby improving the radiation efficiency of the antenna.

[0009] In one possible implementation, the tuning circuit includes at least one of a capacitor and an inductor.

[0010] In this embodiment of the disclosure, the tuning circuit includes at least one of a capacitor and an inductor. By properly configuring the tuning circuit, the desired tuning effect for the corresponding frequency band can be achieved.

[0011] In one possible implementation, the tuning circuit includes an inductor connected in series between two adjacent antenna stubs.

[0012] In this embodiment of the disclosure, by connecting an inductor in series between two adjacent antenna stubs and rationally designing the inductance value of the inductor, the phase difference of the current between the two adjacent antenna stubs can be eliminated, so that the two antenna stubs generate current in the same direction, thereby achieving the same-direction superposition enhancement of the antenna and improving the antenna efficiency.

[0013] In one possible implementation, the inductor includes an inductor tuner with multiple settings, each setting having a different inductance value.

[0014] In this embodiment of the disclosure, by setting the inductor at the gap as an inductor tuner, the inductance value is adjusted to different values ​​for different antenna frequencies, thereby enabling each antenna to obtain better radiation performance.

[0015] In one possible implementation, the tuning circuit includes a capacitor connected in series between two adjacent antenna stubs.

[0016] In this embodiment of the disclosure, a capacitor connected in series between two adjacent antenna stubs is provided in the tuning circuit to filter out high-frequency noise and improve the antenna performance at low and mid-high frequencies.

[0017] In one possible implementation, the tuning circuit includes a capacitor and an inductor;

[0018] The capacitor and inductor are connected in series between two adjacent antenna stubs; or...

[0019] The capacitor and inductor are connected in parallel and then in series between two adjacent antenna stubs.

[0020] In this embodiment of the disclosure, the tuning circuit includes a capacitor and an inductor. By combining the capacitor and the inductor, the desired tuning effect for the corresponding frequency band can be achieved.

[0021] In one possible implementation, the antenna stub includes at least one of an IFA antenna and a T-shaped antenna.

[0022] In this embodiment of the disclosure, the required antenna type can be determined according to the antenna's frequency band in order to achieve better antenna performance and help control antenna costs.

[0023] In one possible implementation, the mid-frame body includes an adjacent first branch and a second branch, both of which are either IFA antennas or T-shaped antennas.

[0024] In this embodiment, the first and second branches have the same shape, which facilitates uniform processing and symmetrical layout of the antenna branches, reducing the difficulty of processing and laying out the antenna branches.

[0025] In one possible implementation, the mid-frame body includes an adjacent first branch and a second branch, one of which is an IFA antenna and the other is a T-shaped antenna.

[0026] In this embodiment, the first and second branches have different shapes, enabling them to radiate antenna signals of different frequency bands, thus meeting diverse communication needs.

[0027] According to a second aspect of the present disclosure, an electronic device is provided, the electronic device including a mid-frame component as described in the first aspect of the present disclosure.

[0028] In this embodiment of the disclosure, the electronic device includes the mid-frame assembly as described above. By setting a tuning circuit to connect and tune two adjacent antenna stubs, electromagnetic waves are transmitted between the antenna stubs. The two adjacent antenna stubs generate currents in the same direction, thereby achieving superposition of radiation in the same direction to improve the radiation efficiency of the antenna and thus improve the user's communication experience.

[0029] 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

[0030] 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.

[0031] Figure 1 This is a structural diagram of the mid-frame component in related technologies.

[0032] Figure 2 This is a schematic diagram of the structure of a mid-frame component according to an exemplary embodiment.

[0033] Figure 3 This is a circuit diagram of a tuning circuit illustrated according to an exemplary embodiment.

[0034] Figure 4 This is a structural schematic diagram of a mid-frame component according to another exemplary embodiment.

[0035] Figure 5 This is a structural schematic diagram of a mid-frame component according to yet another exemplary embodiment.

[0036] Figure 6 This is a structural schematic diagram of a mid-frame component shown according to another exemplary embodiment. Detailed Implementation

[0037] 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.

[0038] With the gradual development of electronic device technology, electronic devices are trending towards smaller thicknesses and larger screen ratios. Consequently, the design space reserved for antennas within electronic devices is becoming increasingly smaller. In related technologies, due to space constraints, the distance between antenna segments is relatively small, leading to mutual interference between antenna segments and poor antenna radiation efficiency.

[0039] like Figure 1 As shown, in related technologies, to achieve antenna signal coverage across multiple frequency bands, antenna stub 10' includes a first stub 11' and a second stub 12'. Antenna stub 10' has a feed point 103' and a ground point 104' to feed current into antenna stub 10' and generate radiated signals. However, a gap 13' exists between the first stub 11' and the second stub 12'. Therefore, current transmission between the first stub 11' and the second stub 12' incurs losses, and it is difficult to control the current phase in the first stub 11' and the second stub 12'. The first stub 11' and the second stub 12' may interfere with each other, causing partial cancellation of the generated radiated signals and reducing antenna efficiency.

[0040] To address the aforementioned technical problems, this disclosure proposes a mid-frame assembly and an electronic device. The mid-frame assembly connects two adjacent antenna stubs by setting a tuning circuit at the seam, enabling electromagnetic waves to propagate between the antenna stubs. This constructs two adjacent antenna stubs into a co-directional magnetic parasitic mode, generating a co-directional superimposed magnetic field, thereby improving the antenna's radiation efficiency.

[0041] According to an exemplary embodiment, such as Figures 2-6 As shown, this embodiment of the present disclosure provides a mid-frame assembly, which includes a mid-frame body (not shown) and a tuning circuit 20. At least two adjacent antenna stubs 10 are disposed on the mid-frame body, and a gap 13 is provided between the adjacent antenna stubs 10. That is, by providing the gap 13, two adjacent antenna stubs 10 are formed on the mid-frame body, and the two antenna stubs 10 can serve as different antenna radiators, enabling the mid-frame antenna to radiate signals across multiple frequency bands.

[0042] like Figure 2As shown, antenna stub 10 has a feed point 103. By feeding current into antenna stub 10, an antenna radiated signal can be generated. Antenna stub 10 can also have a ground point 104 to ground the antenna, thereby reducing interference signals and improving antenna efficiency. Tuning circuit 20 is disposed in the gap 13. Two adjacent antenna stubs 10 are connected through tuning circuit 20. Tuning circuit 20 is used to connect two adjacent antenna stubs 10, so that the current between the two antenna stubs 10 is transmitted through tuning circuit 20 and tunes the antenna stubs 10, so that the two adjacent antenna stubs 10 generate currents in the same direction, thereby achieving superposition of co-directional radiation to improve the antenna's radiation efficiency.

[0043] In this configuration, at least one of two adjacent antenna stubs 10 operates in traveling wave mode. The tuning circuit is used to transmit electromagnetic waves between the two adjacent antenna stubs, so that one of the two adjacent antenna stubs 10 acts as a magnetic parasitic stub of the other antenna stub, generating an antenna radiation signal.

[0044] Traveling waves are typically generated by a single wave source, while standing waves are formed by the superposition of two traveling waves with the same frequency and amplitude but opposite propagation directions under specific conditions. The energy of a traveling wave propagates forward with the wave, exhibiting continuity and periodicity. In contrast, the energy of a standing wave is mainly concentrated in the region between nodes and antinodes; the energy does not propagate over time but oscillates back and forth between nodes and antinodes, exhibiting stability and locality. When multiple antenna stubs 10 operate in traveling wave mode, they exhibit radiation efficiency. When some antenna stubs 10 operate in traveling wave mode and others in standing wave mode, radiation efficiency is generated, but with some loss. When all antenna stubs 10 operate in standing wave mode, the antenna has no radiation efficiency. Therefore, in order for the antenna stub 10 to generate radiation efficiency and realize the antenna's communication function, at least one of the multiple antenna stubs 10 needs to operate in traveling wave mode.

[0045] In this embodiment of the disclosure, by setting a tuning circuit 20 at the gap 13, two adjacent antenna stubs 10 are connected, so that electromagnetic waves can be transmitted between the antenna stubs 10. The two adjacent antenna stubs 10 are constructed into a co-directional magnetic parasitic mode, that is, the two adjacent antenna stubs 10 generate a co-directional superimposed magnetic field, thereby improving the radiation efficiency of the antenna and expanding the radiation aperture of the antenna.

[0046] In some embodiments, the antenna stub 10 includes at least one of an IFA (Inverted-F antenna) antenna and a T-shaped antenna. The shapes of different antenna stubs 10 may be the same or different, and the shape of the antenna stub 10 may be selected according to the desired antenna frequency; this disclosure does not impose excessive limitations on this aspect.

[0047] An IFA antenna is a special antenna design that consists of a first arm 101 and a second arm 102 connected to it. The feed point 103 is located between the first arm 101 and the second arm 102, making the shape of the IFA antenna resemble an inverted letter F. IFA antennas have advantages such as small size, simple structure, easy matching, and low manufacturing cost, and are widely used in short-range wireless communication fields such as Bluetooth and WiFi.

[0048] A T-shaped antenna is a common vertically grounded antenna, generally used for long-wave and medium-wave communications. The structure of a T-shaped antenna consists of a horizontal conductor with a vertical downlead connected to the center, resembling the letter T, hence the name. The T-shaped antenna has a relatively simple structure, and due to its simplicity and low manufacturing cost, it is widely used in the communications field.

[0049] This disclosure does not impose too many restrictions on the shape of the antenna stub 10. Those skilled in the art can determine the required antenna type based on the frequency band of the antenna radiation in order to achieve better antenna performance and help control antenna costs.

[0050] In some embodiments, the antenna stub 10 of the mid-frame body includes adjacent first stub 11 and second stub 12, with the first stub 11 and second stub 12 having the same shape. In one example, both the first stub 11 and second stub 12 are IFA antennas; in another example, both the first stub 11 and second stub 12 are T-shaped antennas. The identical shape of the first stub 11 and second stub 12 in this embodiment facilitates uniform processing and symmetrical layout of the antenna stub 10, reducing the processing and installation difficulty of the antenna stub 10. Of course, it is understood that both the first stub 11 and second stub 12 could also be IFA antennas, but different lengths could be chosen to radiate different frequency bands; this embodiment does not impose excessive limitations on this.

[0051] In some embodiments, the antenna stub 10 of the mid-frame body includes adjacent first stub 11 and second stub 12, the first stub 11 and the second stub 12 having different shapes. In one example, one of the first stub 11 and the second stub 12 is an IFA antenna, and the other is a T-shaped antenna. The different shapes of the first stub 11 and the second stub 12 in this embodiment enable the radiation of antenna signals in different frequency bands, meeting diverse communication needs.

[0052] The following explanation will use the example of both the first stub 11 and the second stub 12 being IFA antennas to illustrate the length design principles of the first stub 11 and the second stub 12.

[0053] The lengths of the first stub 11 and the second stub 12 are determined by the antenna's operating frequency and the dielectric constant of the portion of the electronic device frame excluding the antenna. When the first stub 11 and the second stub 12 are IFA antennas, the length refers to the length of the second arm 102, which is typically about one-quarter of the antenna wavelength.

[0054] Specifically, the wavelength of the first branch 11 is λ1, and the wavelength of the second branch 12 is λ2. Where c is the speed of light (i.e., 3 × 10⁻⁶) 8 f1 is the operating frequency of the first branch 11, f2 is the operating frequency of the second branch 12, and ε is the dielectric constant of the part of the frame of the electronic device excluding the antenna. The length of the first branch 11 is d1 = 1 / 4λ1, and the length of the second branch 12 is d2 = 1 / 4λ2.

[0055] In some embodiments, the tuning circuit 20 includes at least one of a capacitor and an inductor. In one example, the tuning circuit 20 includes an inductor. In another example, the tuning circuit 20 includes a capacitor. In yet another example, the tuning circuit 20 includes both an inductor and a capacitor. In the tuning circuit 20, the capacitor can be used to filter out high-frequency noise, and the inductor can be used to suppress low-frequency fluctuations. By properly configuring the tuning circuit 20, the desired tuning effect for the corresponding frequency band can be achieved. This disclosure does not impose excessive restrictions on the types of electronic components in the tuning circuit 20. The configuration of the tuning circuit 20 can be selected according to the operating frequency band of the antenna stub 10. For example, when two adjacent antenna stubs 10 operate in the low-frequency band or the mid-to-high-frequency band, a capacitor can be included in the tuning circuit 20; when at least one of the two adjacent antenna stubs 10 operates in the high-frequency band, an inductor can be included in the tuning circuit 20.

[0056] In some embodiments, the tuning circuit 20 includes an inductor 21. For example... Figures 2-6 As shown, the inductor 21 is connected in series between two adjacent antenna stubs 10.

[0057] The following analysis will examine the principle behind setting the inductance value L of inductor 21 from the perspective of transmission lines, based on the equivalent impedance in the antenna circuit. Figures 2-3As shown, the first stub 11 and the second stub 12 are equivalent to a transmission line segment. The equivalent impedance of the first stub 11 is Z1, and the equivalent impedance of the second stub 12 is Z2. The equivalent total impedance in the circuit is Z = Z1 + Z2. When the dielectric constant ε of the antenna and the operating frequencies f1 and f2 are determined, the impedance of the corresponding equivalent transmission line is also determined. Considering the phase of the antenna's reflection coefficient Γ, 360° of a circle represents 1 / 2 wavelength. In the design, the length of the first stub 11 is d1 = 1 / 4λ1, and the length of the second stub 12 is d2 = 1 / 4λ2. That is, the lengths of the first stub 11 and the second stub 12 are both 1 / 4 wavelength, which means the equivalent phase is 180°. The current directions are opposite, and the radiated signals between the two cancel each other out.

[0058] According to transmission line theory, when the second stub 12 is a magnetic parasitic stub of the first stub 11: Since the excitation in the circuit is a sinusoidal excitation, the phase changes with time, and the equivalent total impedance in the circuit is as shown in the following formula (1): Z=(R1+R2)+J[2π×d1×f1×sin(θ1×t+180°)+2π×d2×f2×sin(θ1×t+180°)2π×L×sin(θ1×t)×f1] (1)

[0059] When the first branch 11 is used as the magnetic parasitic branch of the second branch 12: Since the excitation in the circuit is a sinusoidal excitation and the phase changes with time, the equivalent total impedance in the circuit is as shown in the following formula (2):

[0060] Z=(R1+R2)+J[2π×d2×f2×sin(θ2×t+180°)+2π×d2×f1×sin(θ2×t+180°)2π×L×sin(θ2×t)×f2] (2)

[0061] As can be seen from formula (1), when the first branch 11 and the second branch 12 are connected in series through the inductor 21, and the second branch 12 is a magnetic parasitic branch of the first branch 11, by taking an appropriate value for L, the imaginary part of the above formula (1) can be made to be 0, and the current phase difference between the first branch 11 and the second branch 12 is 0. At this time, the circuit is in a series resonance state, and the first branch 11 and the second branch 12 generate radiation signals that are superimposed in the same direction. The antenna works in traveling wave mode, and the radiation efficiency is maximized. When the first branch 11 is a magnetic parasitic branch of the second branch 12, please refer to formula (2). The principle is similar to that of the above formula (1), and the embodiments of this disclosure will not be repeated here.

[0062] That is, by connecting the inductor 21 in series between two adjacent antenna stubs 10 and designing the inductance value of the inductor 21 in a reasonable way, the phase difference of the current between the two adjacent antenna stubs 10 can be eliminated, so that the two antenna stubs 10 generate current in the same direction, thereby realizing the same-direction superposition enhancement of the antenna and improving the antenna efficiency.

[0063] In some embodiments, the inductor 21 includes an inductor tuner 211. The inductor tuner 211 has multiple settings, each with a different inductance value, allowing switching between different inductance settings based on the antenna frequency. Since the inductor design mentioned in formula (1) aims to achieve better radiation performance for the first branch 11, and the inductor design mentioned in formula (2) aims to achieve better radiation performance for the second branch 12, if both the first branch 11 and the second branch 12 are to achieve better radiation performance, the inductor 21 at the gap 13 can be configured as an inductor tuner 211, adjusting to different inductance values ​​for different antenna frequencies, thereby achieving better radiation performance for each antenna.

[0064] In some embodiments, the tuning circuit 20 includes a capacitor (not shown) connected in series between two adjacent antenna stubs 10. For example, when both adjacent antenna stubs 10 operate in the low-frequency band or the mid-to-high-frequency band, the tuning circuit 20 may include a capacitor connected in series between the two adjacent antenna stubs 10 to filter out high-frequency noise and improve the antenna performance at low and mid-to-high frequencies.

[0065] In some embodiments, the tuning circuit 20 includes a capacitor and an inductor. That is, the tuning circuit includes an LC circuit composed of a capacitor and an inductor, wherein the LC circuit can be an LC parallel resonant circuit, an LC series resonant circuit, or an LC series-parallel circuit. In one example, the capacitor and inductor are connected in series between two adjacent antenna stubs 10; in another example, the capacitor and inductor are connected in parallel and then in series between two adjacent antenna stubs 10. This disclosure does not impose excessive restrictions on the connection method of the capacitor and inductor, and can be configured according to the antenna frequency and tuning requirements.

[0066] In some embodiments, two adjacent antenna stubs 10 can operate in multiple frequency bands.

[0067] In one example, one of the two adjacent antenna stubs 10 operates in the MHB band (1.5 GHz to 3.0 GHz), and the other antenna stub 10 operates in the N78 band (3.3 GHz to 3.8 GHz) and / or the N79 band (4.8 GHz to 4.9 GHz).

[0068] In another example, one of the two adjacent antenna stubs 10 operates in the N78 band, and the other antenna stub 10 operates in the N79 band.

[0069] In yet another example, one of the two adjacent antenna stubs 10 operates in the MHB band, while the other antenna stub 10 operates in the WiFi band (around 2.4 GHz and around 5 GHz).

[0070] In another example, one of the two adjacent antenna stubs 10 operates in the WiFi band, while the other antenna stub 10 operates in the N78 and / or N79 bands.

[0071] Of course, it is understood that the operating frequency of the antenna stub 10 can also be selected from other frequency bands according to design requirements. Those skilled in the art can refer to the technical content of the embodiments of this disclosure and make adaptive adjustments to parameters such as the length of the antenna stub 10 and the inductance value of the inductor 21 according to the operating frequency of the antenna stub 10. The embodiments of this disclosure do not impose too many restrictions on this.

[0072] In some embodiments, antenna stub 10 is a single-fed antenna. That is, as... Figures 2-6 As shown, each antenna stub 10 has a feed point 103. It is understood that those skilled in the art can also set multiple feed points 103 for the antenna stub 10, and the embodiments of this disclosure do not impose too much limitation on the number of feed points 103 for the antenna stub 10.

[0073] According to an exemplary embodiment, such as Figures 2-6 As shown, this disclosure provides an electronic device, such as a mobile terminal, tablet computer, laptop computer, smartwatch, smart bracelet, or other communication-enabled electronic device. The electronic device includes a mid-frame assembly as described in the above embodiments. The mid-frame assembly includes a mid-frame body (not shown) and a tuning circuit 20. At least two adjacent antenna stubs 10 are disposed on the mid-frame body, and a gap 13 is provided between the adjacent antenna stubs 10. The tuning circuit 20 is disposed at the gap 13, and the two adjacent antenna stubs 10 are connected through the tuning circuit 20. At least one of the two adjacent antenna stubs 10 operates in traveling wave mode. The tuning circuit is used to transmit electromagnetic waves between the two adjacent antenna stubs, so that one of the two adjacent antenna stubs 10 acts as a magnetic parasitic stub of the other antenna stub, generating an antenna radiation signal.

[0074] In this embodiment of the disclosure, the electronic device includes the mid-frame assembly as described above. A tuning circuit 20 is provided at the seam 13 of the mid-frame assembly. The tuning circuit 20 is used to connect two adjacent antenna stubs 10 and tune the antenna stubs 10 so that electromagnetic waves are transmitted between the antenna stubs 10. This causes the two adjacent antenna stubs 10 to generate currents in the same direction, thereby achieving superposition of radiation in the same direction to improve the radiation efficiency of the antenna and thus improve the user's communication experience.

[0075] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This disclosure 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.

[0076] 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, include: The middle frame body is provided with at least two adjacent antenna stubs, and a gap is provided between the adjacent antenna stubs; A tuning circuit is disposed at the gap, and the tuning circuit connects two adjacent antenna stubs; In this configuration, at least one of two adjacent antenna stubs operates in traveling wave mode, and the tuning circuit is used to transmit electromagnetic waves between the two adjacent antenna stubs, so that one of the two adjacent antenna stubs acts as a magnetic parasitic stub of the other antenna stub.

2. The mid-frame assembly according to claim 1, characterized in that, The tuning circuit includes at least one of a capacitor and an inductor.

3. The mid-frame assembly according to claim 2, characterized in that, The tuning circuit includes an inductor connected in series between two adjacent antenna stubs.

4. The mid-frame assembly according to claim 3, characterized in that, The inductor device includes an inductor tuner, which has multiple settings, each with a different inductance value.

5. The mid-frame assembly according to claim 2, characterized in that, The tuning circuit includes a capacitor connected in series between two adjacent antenna stubs.

6. The mid-frame assembly according to claim 2, characterized in that, The tuning circuit includes a capacitor and an inductor; The capacitor and inductor are connected in series between two adjacent antenna stubs; or... The capacitor and inductor are connected in parallel and then in series between two adjacent antenna stubs.

7. The mid-frame assembly according to any one of claims 1 to 6, characterized in that, The antenna stub includes at least one of an IFA antenna and a T-shaped antenna.

8. The mid-frame assembly according to claim 7, characterized in that, The middle frame body includes an adjacent first branch and a second branch, both of which are either IFA antennas or T-shaped antennas.

9. The mid-frame assembly according to claim 7, characterized in that, The middle frame body includes an adjacent first branch and a second branch, one of which is an IFA antenna and the other is a T-shaped antenna.

10. An electronic device, characterized in that, The electronic device includes the mid-frame assembly as described in any one of claims 1 to 9.

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