Mobile terminal with multi-resonant mode antenna

Abstract

The application discloses a mobile terminal with a multi-resonant mode antenna, which comprises a bottom shell, an antenna structure arranged on the outer periphery of the bottom shell, and a plurality of radiation bodies in the antenna structure, at least two of which are connected by bending, so that the plurality of radiation bodies work at different resonant frequency bands respectively; for the mobile terminal, the antenna structure is arranged on the bottom shell of the mobile terminal, and there is sufficient space between the bottom shell and other functional structural members of the mobile terminal, so that the plurality of radiation bodies are arranged by bending in a wiring mode, so that the antenna structure has a plurality of resonant frequency bands, has a multi-mode resonant effect and multi-directional radiation; in addition, since the antenna structure is arranged on the outer periphery of the bottom shell, the radiation capacity of the antenna structure is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of antenna structure arrangement technology, and in particular to a mobile terminal with a multi-resonant mode antenna. Background Technology

[0002] Wireless mobile terminals rely on antennas for wireless communication, making antennas crucial in wireless mobile terminal devices. For mobile terminals like smartphones, ultra-thin models are popular with users. However, smartphones are high-precision structural components; the thinner the body, the stricter the requirements for the spatial installation of each component. Simultaneously, to save installation space as much as possible, every component of a smartphone is being miniaturized, such as antennas, including FPC antennas, PCB antennas, and MDA antennas (in-mold injection molding antennas).

[0003] For current mid-to-high-end mobile phones, it's rare to find a pure plastic shell + FPC antenna solution. Most use metal frames or MDA antennas instead. Compared to the antenna structure with a metal frame, phones using MDA antennas ensure the overall structural strength of the device, give the body a metallic feel, and solve the problem of gaps in the overall appearance due to the antenna.

[0004] Existing MDA antenna solutions typically use a metal side panel located on the periphery of the device's mid-frame as the antenna radiator. The radiator is directly connected to the mid-frame, while the alloy bracket (for supporting the motherboard and LCD) is located between them. Due to space constraints, multi-directional routing of the antenna radiator on the mid-frame is not possible. Therefore, a drawback of MDA antennas is that their resonant modes are often relatively singular, lacking the multi-mode characteristics of FPC antenna routing.

[0005] Therefore, to achieve multi-mode characteristics for the MDA antenna, the conventional approach is to simultaneously install an LDS (laser-etched antenna) on the battery-side plane of the device, along with the MDA antenna, to meet the antenna's resonant frequency bandwidth requirements. However, this approach introduces two problems: first, the antenna's height is limited, preventing it from being placed on the outermost structural component; it must be placed on a bracket under the battery cover, resulting in poor radiation capability; second, there are issues with the continuity of the LDS and MDA wiring integration. The LDS upper frame requires multiple spring clips for connection, and most LDS elements can only be used as antenna parasitic elements, limiting the bandwidth improvement.

[0006] In summary, the antenna configuration structure of mobile terminals is improved. Summary of the Invention

[0007] The purpose of this invention is to provide a mobile terminal with a multi-mode resonant antenna that has both multi-mode resonance effect and good radiation capability.

[0008] To achieve the above objectives, the present invention discloses a mobile terminal with a multi-resonant mode antenna, which includes a bottom shell, and an antenna structure is arranged around the periphery of the bottom shell. The antenna structure includes multiple radiators, and at least two of the multiple radiators are bent and connected so that the multiple radiators operate in different resonant frequency bands.

[0009] Preferably, the bottom shell includes a bottom wall and a side wall with an integrated structure, the side wall serving as the middle frame of the mobile terminal.

[0010] Preferably, the bottom shell includes a metallized inner shell and a plasticized outer shell fitted on the inner shell, with a clearance notch provided on at least one side of the inner shell, and the antenna structure is disposed on the inner wall of the outer shell opposite to the clearance notch.

[0011] Preferably, the outer shell and the inner shell are integrally formed.

[0012] Preferably, the antenna structure is injection molded onto the bottom shell.

[0013] Preferably, the radiator comprises a first segment, a second segment, and a third segment, wherein the length of the second segment is greater than the length of the first segment, one end of the third segment is connected to the second segment via a first bend, and the other end of the third segment is connected to the first segment via a second bend, and a slot is provided between the first segment and the second segment.

[0014] Preferably, the first segment provides a high-frequency resonant segment for the antenna structure, the second segment provides a low-frequency resonant segment for the antenna structure, and the first bend provides a first intermediate-frequency resonant segment for the antenna structure.

[0015] Preferably, the radiator further includes a fourth segment, which is arranged parallel to and spaced outside the third segment to parasitically couple with the third segment, and the fourth segment provides a second intermediate frequency resonant segment for the antenna structure.

[0016] Preferably, the antenna structure further includes a first connection point and a second connection point disposed on the sidewall of any one or both of the first branch, the second branch, and the third branch. The first connection point is used for electrical connection to the ground signal terminal of the motherboard on the mobile terminal, and the second connection point is used for electrical connection to the antenna matching circuit disposed on the motherboard. The antenna structure further includes a third connection point disposed on the fourth branch, the third connection point being used for electrical connection to the ground signal terminal of the motherboard.

[0017] Compared with the prior art, the mobile terminal disclosed in the above technical solution of the present invention is provided with an antenna structure. The antenna structure is set on the bottom shell of the mobile terminal, and there is ample space between the bottom shell and other functional structural components of the mobile terminal. Therefore, the multiple radiators are arranged by bending in the form of wiring, so that the antenna structure has multiple resonant frequency bands, multi-mode resonance effect and multi-directional radiation. In addition, since the antenna structure is located on the outer periphery of the bottom shell, the radiation capability of the antenna structure is effectively improved. Attached Figure Description

[0018] Figure 1 This is a three-dimensional perspective view of the mobile terminal in an embodiment of the present invention.

[0019] Figure 2 This is a diagram showing the installation structure of the antenna structure in an embodiment of the present invention.

[0020] Figure 3 for Figure 2 The front view.

[0021] Figure 4 A three-dimensional structural diagram of the antenna structure in an embodiment of the present invention. Detailed Implementation

[0022] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] This embodiment discloses a mobile terminal, such as a mobile phone, tablet, or other portable terminal device with wireless communication capabilities. Figures 1 to 4 The mobile terminal in this embodiment includes a bottom shell 1. An antenna structure is provided around the periphery of the bottom shell 1. The antenna structure includes multiple radiators 2. In this embodiment, the radiators 2 are conductive metal sheets, and at least two of the multiple radiators 2 are bent and connected. That is, each radiator 2 is laid out in the form of a wiring so that the multiple radiators 2 can work in different resonant frequency bands.

[0024] On the other hand, the bottom shell 1 includes a bottom wall 10 and a side wall 11 with an integrated structure. The side wall 11 serves as the middle frame of the mobile terminal, and the bottom wall 10 can serve as the back cover and support of the mobile terminal, such as for supporting the motherboard and LCD.

[0025] On the other hand, the bottom shell 1 includes a metallized inner shell K2 and a plasticized outer shell K1 fitted onto the inner shell K2. At least one side of the inner shell K2 has a clearance notch K20, and the antenna structure is disposed on the inner wall of the outer shell K1 opposite to the clearance notch K20. In this embodiment, dividing the bottom shell 1 into a metallized inner shell K2 and a plasticized outer shell K1 effectively ensures the supporting performance of the bottom shell 1 and maintains the overall consistency of its appearance. Furthermore, since the antenna structure is located at the clearance notch K20 of the inner shell K2, interference from the metallized inner shell K2 with the antenna structure's radiation capability can be avoided. In this embodiment, the inner shell K2 and the outer shell K1 are integrally formed by in-mold injection molding.

[0026] Furthermore, the antenna structure is injection molded onto the bottom shell 1, meaning that the antenna structure in this embodiment is an MDA antenna. Specifically, the antenna structure is injection molded onto the plastic outer shell K1.

[0027] For conventional MDA+LDS antenna structures in the prior art, the distance between the LDS antenna and the outer surface of the bottom cover (i.e., the battery cover) is: 0.7 (battery cover thickness) + 0.3 (foam adhesive) + 0.6 (B-shell support) = 1.6 mm. However, in this embodiment of the invention, the distance between the planar traces of the antenna structure and the outer surface of the bottom cover 1 is only 0.7 mm. Therefore, the height of the antenna structure can be relatively increased by 0.9 mm, with an estimated antenna efficiency improvement of over 1 dB, and an antenna bandwidth improvement of over 20 MHz for low frequencies and over 50 MHz for mid-to-high frequencies.

[0028] On the other hand, such as Figures 2 to 4 The multi-segment radiator 2 includes a first segment 20, a second segment 21, and a third segment 22. The length of the second segment 21 is greater than the length of the first segment 20. One end of the third segment 22 is connected to the second segment 21 via a first bend 24, and the other end of the third segment 22 is connected to the first segment 20 via a second bend 25. A slot 26 is formed between the first segment 20 and the second segment 21. The first segment 20 and the second segment 21 form a coupling capacitor through the slot 26, and electromagnetic wave signals are transmitted between the first segment 20 and the second segment 21 through this coupling capacitor.

[0029] Specifically, the first segment 20 provides a high-frequency resonant segment for the antenna structure, the second segment 21 provides a low-frequency resonant segment for the antenna structure, and the first bend 24 provides a first intermediate-frequency resonant segment for the antenna structure.

[0030] Furthermore, the multi-segment radiator 2 in this embodiment also includes a fourth segment 23, which is arranged parallel to and spaced outside the third segment 22 so that the fourth segment 23 is parasiticly coupled to the third segment 22. The fourth segment 23 provides a second intermediate frequency resonant segment for the antenna structure.

[0031] On the other hand, the antenna structure also includes a first connection terminal J1 and a second connection terminal J2 disposed on the sidewall 11 of any one or both of the first branch 20, the second branch 21, and the third branch 22. The first connection terminal J1 is used to electrically connect to the ground signal terminal of the motherboard on the mobile terminal, that is, the antenna structure is connected to the ground on the motherboard through the first connection terminal J1. The second connection terminal J2 is used to electrically connect to the antenna matching circuit disposed on the motherboard to adjust the operating parameters of the antenna structure such as the matching impedance and matching frequency. The antenna structure also includes a third connection terminal J3 disposed on the fourth branch 23, which is used to electrically connect to the ground signal terminal of the motherboard, that is, the third connection terminal J3 is a parasitic grounding point.

[0032] In summary, the above embodiments of the present invention disclose a mobile terminal, which improves the antenna arrangement and mounting structure of the mobile terminal. Specifically, the antenna structure is disposed on the bottom shell 1 of the mobile terminal, and there is ample space between the bottom shell 1 and other functional structural components of the mobile terminal. Therefore, the multiple radiators 2 are arranged by bending in a wiring manner, so that the antenna structure has multiple resonant frequency bands, and has multi-mode resonance effect and multi-directional radiation. In addition, since the antenna structure is located on the outer periphery of the bottom shell 1, the radiation capability of the antenna structure is effectively improved.

[0033] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A mobile terminal with a multi-resonant mode antenna, characterized in that, The device includes a bottom shell, and an antenna structure is arranged around the periphery of the bottom shell. The antenna structure includes multiple radiators, and at least two of the multiple radiators are bent and connected so that the multiple radiators operate in different resonant frequency bands. The bottom shell includes a metallized inner shell and a plasticized outer shell fitted on the inner shell. At least one side of the inner shell is provided with a clearance notch, and the antenna structure is disposed on the inner wall of the outer shell opposite to the clearance notch. The multi-segment radiator includes a first segment, a second segment, and a third segment. The length of the second segment is greater than the length of the first segment. One end of the third segment is connected to the second segment through a first bend, and the other end of the third segment is connected to the first segment through a second bend. A slot is provided between the first segment and the second segment. The first segment provides a high-frequency resonant segment for the antenna structure, the second segment provides a low-frequency resonant segment for the antenna structure, and the first bend provides a first mid-frequency resonant segment for the antenna structure; The radiator further includes a fourth segment, which is arranged parallel to and spaced outside the third segment to parasitically couple with the third segment, and the fourth segment provides a second intermediate frequency resonant segment for the antenna structure.

2. The mobile terminal with a multi-resonant mode antenna according to claim 1, characterized in that, The bottom shell includes a bottom wall and a side wall with an integrated structure, the side wall serving as the middle frame of the mobile terminal.

3. The mobile terminal with a multi-resonant mode antenna according to claim 1, characterized in that, The outer shell and the inner shell are integrally formed.

4. The mobile terminal with a multi-resonant mode antenna according to claim 1, characterized in that, The antenna structure is injection molded onto the bottom shell.

5. The mobile terminal with a multi-resonant mode antenna according to claim 1, characterized in that, The antenna structure further includes a first connection point and a second connection point disposed on the side wall of any one or both of the first branch, the second branch, and the third branch. The first connection point is used to electrically connect to the ground signal terminal of the motherboard on the mobile terminal, and the second connection point is used to electrically connect to the antenna matching circuit disposed on the motherboard. The antenna structure further includes a third connection point disposed on the fourth branch. The third connection point is used to electrically connect to the ground signal terminal of the motherboard.

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