Antenna system and mobile terminal
By setting up capacitor-inductor filter modules between adjacent antennas, the problems of complex antenna system design and increased size are solved, achieving high isolation and aesthetics.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2026-04-07
AI Technical Summary
The multi-antenna design leads to complex antenna system design and circuit layout, and increases the size of the mobile terminal.
Capacitor-inductor filter modules are set between adjacent antennas to reduce coupling and improve antenna isolation by using open or short circuit states, thus reducing the need for additional decoupling structures.
It improves antenna isolation, reduces antenna system size, and maintains the integrity and aesthetics of the metal housing.
Smart Images
Figure CN121812932A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wireless communication technology, and more specifically, to an antenna system and a mobile terminal. Background Technology
[0002] With the development of mobile communication and the background of multi-operator multi-frequency band co-construction and sharing, the number of antennas set in mobile terminals is constantly increasing, which leads to an increase in the negative impact between antennas, low antenna isolation, and performance degradation.
[0003] In related technologies, coupling structures are added to reduce the coupling signal between adjacent antennas and improve antenna isolation; however, coupling structures lead to complex antenna and circuit design layouts, and also result in large mobile terminal sizes. Summary of the Invention
[0004] The purpose of this application is to provide an antenna system and a mobile terminal to solve the technical problems of complex antenna design and circuit layout caused by multi-antenna decoupling in related technologies.
[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:
[0006] A first aspect of this application provides an antenna system comprising: a metal housing; the metal housing including multiple antenna regions, each antenna region being provided with a first antenna, a second antenna, and a capacitor-inductor filter module, the capacitor-inductor filter module being disposed between the first antenna and the second antenna; a grounding connector being disposed within the metal housing, the input and output terminals of the capacitor-inductor filter module being electrically connected to the grounding connector; the capacitor-inductor filter module including an open-circuit state or a short-circuit state, the capacitor-inductor filter module being capable of reducing the coupling between the first antenna and the second antenna according to the operating frequency band between the first antenna and the second antenna.
[0007] In one possible implementation, when the first antenna operates at a low frequency and the second antenna operates at a mid-to-high frequency, the capacitor-inductor filter module is in an open-circuit state; when both the first antenna and the second antenna operate at mid-to-high frequencies, the capacitor-inductor filter module is in a short-circuit state.
[0008] In one possible implementation, when the first antenna operates at a low frequency and the second antenna operates at a mid-to-high frequency, the capacitor-inductor filter module is in an open-circuit state; when both the first antenna and the second antenna operate at low frequencies, the capacitor-inductor filter module is in a short-circuit state.
[0009] In one possible implementation, the capacitor-inductor filter module includes a first capacitor and a first inductor connected in series; the input terminal is electrically connected to the first capacitor, and the output terminal is electrically connected to the first inductor.
[0010] In one possible implementation, the capacitor-inductor filter module includes a first capacitor and a first inductor connected in parallel; both the first capacitor and the first inductor are electrically connected to the input terminal, and both the first capacitor and the first inductor are electrically connected to the output terminal.
[0011] In one possible implementation, the capacitor-inductor filter module includes a first capacitor, a second capacitor, and a first inductor, wherein the first capacitor and the first inductor are connected in parallel, and both the first capacitor and the first inductor are connected in series with the second capacitor; both the first capacitor and the first inductor are electrically connected to the input terminal, and the output terminal is electrically connected to the second capacitor.
[0012] In one possible implementation, the capacitor-inductor filter module includes a first capacitor, a first inductor, and a second inductor, wherein the first capacitor and the first inductor are connected in parallel, and both the first capacitor and the first inductor are connected in series with the second inductor; both the first capacitor and the first inductor are electrically connected to the input terminal, and the output terminal is electrically connected to the second inductor.
[0013] In one possible implementation, the metal housing includes a first sidewall, and the plurality of antenna regions are located close to the first sidewall.
[0014] In one possible implementation, the metal housing includes a base plate and a frame surrounding the base plate, with one end of the grounding connector connected to the frame and the other end of the grounding connector connected to the base plate.
[0015] A second aspect of this application provides a mobile terminal that includes the antenna system described above.
[0016] Compared with related technologies, the antenna system provided in this application reduces the coupling between adjacent antennas by setting an equivalent filter circuit between adjacent antennas, thereby improving the antenna isolation and reducing the negative impact between antennas; no additional decoupling structure is required, which reduces the size of the antenna system itself.
[0017] Meanwhile, the antenna system provided in this application embodiment satisfies the requirement of a seamless metal frame, ensuring the integrity of the metal casing and improving the aesthetics of the mobile terminal.
[0018] In addition to the technical problems solved by the embodiments of this disclosure, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the chassis and mobility scooter provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 Schematic diagram of the structure of the metal housing of the antenna system provided in the embodiments of this application Figure 1 ;
[0021] Figure 2 Schematic diagram of the structure of the metal housing of the antenna system provided in the embodiments of this application Figure 2 ;
[0022] Figure 3 This is a schematic diagram of the structure of the antenna mounted on the metal housing according to an embodiment of this application;
[0023] Figure 4 for Figure 3 Enlarged view of section A;
[0024] Figure 5 The circuit of the capacitor-inductor filter module provided in the embodiments of this application Figure 1 ;
[0025] Figure 6 The circuit of the capacitor-inductor filter module provided in the embodiments of this application Figure 2 ;
[0026] Figure 7 The circuit of the capacitor-inductor filter module provided in the embodiments of this application Figure 3 ;
[0027] Figure 8 The circuit of the capacitor-inductor filter module provided in the embodiments of this application Figure 4 ;
[0028] Figure 9 A schematic diagram of the return loss of the first and second antennas provided in the embodiments of this application;
[0029] Figure 10A comparison diagram of the isolation performance of a capacitor-inductor filter module and a capacitor-free inductor filter module provided in the embodiments of this application.
[0030] Explanation of reference numerals in the attached figures:
[0031] 101-Base plate; 102-Frame; 103-First sidewall;
[0032] 200-antenna area;
[0033] 201 - First antenna region; 202 - Second antenna region; 203 - Intermediate region;
[0034] 300 - First antenna; 301 - First feed source;
[0035] 400 - Second antenna; 401 - Second feed source;
[0036] 500-Capacitor-Inductor Filter Module;
[0037] C1 - First capacitor; C2 - Second capacitor;
[0038] E1 - First inductor; E2 - Second inductor. Detailed Implementation
[0039] Antenna systems in related technologies often suffer from complex antenna and circuit design layouts due to multi-antenna decoupling. The inventors discovered that this problem arises because, in related technologies, adding coupling units between adjacent antennas increases the coupling path, thereby canceling out coupling signals and improving antenna isolation. However, adding coupling units increases the physical distance between antennas, potentially leading to excessively large mobile terminals.
[0040] To address the aforementioned technical problems, the antenna system provided in this application embodiment includes an equivalent filter circuit between adjacent antennas. This equivalent filter circuit reduces the coupling between adjacent antennas, thereby improving antenna isolation and reducing the negative impact between antennas. No additional decoupling structure is required, thus reducing the overall size of the antenna system.
[0041] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0042] To facilitate the description of the embodiments of this application, the coordinate system in the accompanying drawings will be explained, wherein the X-axis direction can be a first direction, which is the width direction of the metal shell in the horizontal direction; the Y-axis direction can be a second direction, which is the width direction of the metal shell in the horizontal direction; the first direction and the second direction are perpendicular.
[0043] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the antenna system provided in this application embodiment includes: a metal housing, the metal housing including a base plate 101 and a frame 102, the frame 102 surrounding the base plate 101.
[0044] The antenna system provided in this application embodiment can be installed on mobile terminals such as mobile phones and tablets. The base plate 101 can be the metal back plate of the mobile terminal, and the frame 102 can be the metal frame of the mobile terminal.
[0045] The metal housing includes multiple antenna areas 200 for mounting antennas.
[0046] like Figure 3 As shown in the embodiment of this application, the metal housing includes a first sidewall 103, which is one side of the frame 102; multiple antenna regions 200 are all close to the first sidewall 103, that is, multiple antenna regions 200 are concentrated on one side of the metal housing to save radio frequency lines.
[0047] like Figure 1 and Figure 2 As shown in the embodiments of this application, the metal housing may include two antenna regions 200, which are arranged at a relative interval along a first direction (X-axis direction).
[0048] Antenna region 200 can be an L-shaped region; wherein, the L-shaped region includes a long region and a short region that are perpendicular to each other, the long region can be set close to the first sidewall 103, and the short region can be set close to the second sidewall that is perpendicular to and intersects the first sidewall 103.
[0049] like Figure 2 As shown in the embodiments of this application, each antenna region 200 includes a first antenna region 201 and a second antenna region 202. The first antenna region 201 is the sum of a short-size region and a part of a long-size region, and the second antenna region 202 is the remaining part of the long-size region.
[0050] Each antenna region 200 is equipped with a first antenna 300 and a second antenna 400, wherein the first antenna 300 is located in the first antenna region 201 and the second antenna 400 is located in the second antenna region 202.
[0051] The first antenna 300 includes a first feed 301 for transmitting the first antenna signal; the second antenna 400 includes a second feed 401 for transmitting the second antenna signal.
[0052] The first antenna 300 can operate in low-frequency bands, mid-to-high-frequency bands, and 5G bands; the second antenna 400 can operate in low-frequency bands, mid-to-high-frequency bands, and 5G bands.
[0053] like Figure 2 As shown in the embodiments of this application, each antenna region 200 includes a middle region 203, which is located within a long-dimensional region and is located between the first antenna region 201 and the second antenna region 202.
[0054] like Figure 4 As shown in the embodiment of this application, a capacitor-inductor filter module 500 is provided in each antenna region 200, and the capacitor-inductor filter module 500 is located in the middle region 203; that is, the capacitor-inductor filter module 500 is located between the first antenna 300 and the second antenna 400.
[0055] The metal casing also contains a grounding connector, and the input and output terminals of the capacitor-inductor filter module 500 are electrically connected to the grounding connector.
[0056] In this embodiment, one end of the grounding connector is connected to the frame 102, and the other end of the grounding connector is connected to the base plate 101.
[0057] The capacitor-inductor filter module 500 can be an LC filter.
[0058] The capacitor-inductor filter module 500 operates in two states: open circuit and short circuit. The capacitor-inductor filter module 500 can reduce the coupling between the first antenna 300 and the second antenna 400 based on the operating frequency band between them.
[0059] In this embodiment, the operating frequency band of the first antenna 300 may include a low-frequency band, a mid-to-high-frequency band, and a 5G band; the operating frequency band of the second antenna 400 may include a mid-to-high-frequency band and a 5G band.
[0060] When the first antenna 300 operates in a low-frequency band and the second antenna 400 operates in a mid-to-high frequency band and a 5G frequency band, the capacitor-inductor filter module 500 is in an open-circuit state; thus realizing the spatial reuse of the antenna region 200, so that the antenna region 200 can serve as both the low-frequency radiation space of the first antenna 300 and the mid-to-high frequency and 5G radiation space of the second antenna 400.
[0061] When the first antenna 300 operates in the mid-to-high frequency band and the second antenna 400 operates in the mid-to-high frequency band, the capacitor-inductor filter module 500 is in a short-circuit state; the first antenna region 201 serves as the radiation space of the first antenna 300, and the second antenna region 202 serves as the radiation space of the second antenna 400; while ensuring low-frequency radiation performance, the mutual interference problem of mid-to-high frequencies is effectively solved.
[0062] In other words, the low-frequency operating wavelength of the first antenna 300 is the total length of the antenna region 200, while the mid-to-high frequency operating wavelength and the 5G band operating wavelength of the first antenna 300 are restricted within the first antenna region 201; similarly, the mid-to-high frequency operating wavelength and the 5G band operating wavelength of the second antenna 400 are restricted within the second antenna region 202, thereby achieving the decoupling requirements of the first antenna 300 and the second antenna 400.
[0063] In this embodiment, the operating frequency band of the first antenna 300 may include a low-frequency band, a mid-to-high-frequency band, and a 5G band; the operating frequency band of the second antenna 400 may include a low-frequency band, a mid-to-high-frequency band, and a 5G band.
[0064] When the first antenna 300 operates in a low-frequency band and the second antenna 400 operates in a mid-to-high frequency band and a 5G frequency band, the capacitor-inductor filter module 500 is in an open-circuit state; thus realizing the spatial reuse of the antenna region 200, so that the antenna region 200 can serve as both the low-frequency radiation space of the first antenna 300 and the mid-to-high frequency and 5G frequency band radiation space of the second antenna 400.
[0065] When the operating frequency band of the first antenna 300 is low frequency and the operating frequency band of the second antenna 400 is low frequency, the capacitor-inductor filter module 500 is in a short-circuit state; the first antenna region 201 serves as the radiation space of the first antenna 300 and the second antenna region 202 serves as the radiation space of the second antenna 400, effectively solving the problem of mutual interference at low frequency while ensuring the mid-to-high frequency radiation performance.
[0066] In other words, the mid-to-high frequency operating wavelength and the 5G band operating wavelength of the first antenna 300 are the total length of the antenna region 200, while the low frequency operating wavelength of the first antenna 300 is limited to the first antenna region 201; similarly, the low frequency operating wavelength of the second antenna 400 is limited to the second antenna region 202, thereby achieving the decoupling requirements of the first antenna 300 and the second antenna 400.
[0067] like Figure 10 As shown, the isolation of the antenna system with the capacitor-inductor filter module 500 is significantly lower than that of the antenna system without the capacitor-inductor filter module 500.
[0068] Meanwhile, the capacitor-inductor filter module 500 does not affect the integrity of the metal frame, so that the metal shell has a seamless metal frame, which is simple in structure and low in cost; and can save the cost of in-mold injection molding caused by broken frame.
[0069] like Figure 5 As shown in the embodiment of this application, the capacitor-inductor filter module 500 includes a first capacitor C1 and a first inductor E1, which are connected in series; the input terminal of the grounding connector is electrically connected to the first capacitor C1, and the output terminal of the grounding connector is electrically connected to the first inductor E1.
[0070] like Figure 6 As shown in the embodiment of this application, the capacitor-inductor filter module 500 includes a first capacitor C1 and a first inductor E1, which are connected in parallel; both the first capacitor C1 and the first inductor E1 are electrically connected to the input terminal of the grounding connector, and both the first capacitor C1 and the first inductor E1 are electrically connected to the output terminal of the grounding connector.
[0071] like Figure 7 As shown in the embodiment of this application, the capacitor-inductor filter module 500 includes a first capacitor C1, a second capacitor C2, and a first inductor E1. The first capacitor C1 and the first inductor E1 are connected in parallel, and both the first capacitor C1 and the first inductor E1 are connected in series with the second capacitor C2. The first capacitor C1 and the first inductor E1 are both electrically connected to the input terminal of the grounding connector, and the output terminal of the grounding connector is electrically connected to the second capacitor C2.
[0072] like Figure 8 As shown in the embodiment of this application, the capacitor-inductor filter module 500 includes a first capacitor C1, a first inductor E1, and a second inductor E2. The first capacitor C1 and the first inductor E1 are connected in parallel, and both the first capacitor C1 and the first inductor E1 are connected in series with the second inductor E2. The first capacitor C1 and the first inductor E1 are both electrically connected to the input terminal of the grounding connector, and the output terminal of the grounding connector is electrically connected to the second inductor E2.
[0073] This application also provides a mobile terminal that includes the antenna system described above.
[0074] Among them, mobile terminals can be mobile phones, tablets, watches, etc.
[0075] The antenna system of this application embodiment has the characteristic of a seamless metal frame, which can bring greater benefits when installed in the above-mentioned space-constrained products.
[0076] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
[0077] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.
[0078] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "one" or "" can also be understood to convey either singular or plural usage.
[0079] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).
[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. An antenna system, characterized in that, include: Metal casing; The metal housing includes multiple antenna regions, each of which is provided with a first antenna, a second antenna, and a capacitor-inductor filter module, wherein the capacitor-inductor filter module is disposed between the first antenna and the second antenna; A grounding connector is provided inside the metal housing, and the input and output terminals of the capacitor-inductor filter module are both electrically connected to the grounding connector. The capacitor-inductor filter module includes an open-circuit state or a short-circuit state, and the capacitor-inductor filter module can reduce the coupling between the first antenna and the second antenna according to the operating frequency band between the first antenna and the second antenna.
2. The antenna system according to claim 1, characterized in that, When the first antenna operates at a low frequency and the second antenna operates at a mid-to-high frequency, the capacitor-inductor filter module is in an open-circuit state. When both the first antenna and the second antenna operate at mid-to-high frequencies, the capacitor-inductor filter module is in a short-circuit state.
3. The antenna system according to claim 1, characterized in that, When the first antenna operates at a low frequency and the second antenna operates at a mid-to-high frequency, the capacitor-inductor filter module is in an open-circuit state. When both the operating frequency band of the first antenna and the operating frequency band of the second antenna are low frequency, the capacitor-inductor filter module is in a short-circuit state.
4. The antenna system according to claim 1, characterized in that, The capacitor-inductor filter module includes a first capacitor and a first inductor, which are connected in series. The input terminal is electrically connected to the first capacitor, and the output terminal is electrically connected to the first inductor.
5. The antenna system according to claim 1, characterized in that, The capacitor-inductor filter module includes a first capacitor and a first inductor, wherein the first capacitor and the first inductor are connected in parallel. Both the first capacitor and the first inductor are electrically connected to the input terminal, and both the first capacitor and the first inductor are electrically connected to the output terminal.
6. The antenna system according to claim 1, characterized in that, The capacitor-inductor filter module includes a first capacitor, a second capacitor, and a first inductor. The first capacitor and the first inductor are connected in parallel, and both the first capacitor and the first inductor are connected in series with the second capacitor. Both the first capacitor and the first inductor are electrically connected to the input terminal, and the output terminal is electrically connected to the second capacitor.
7. The antenna system according to claim 1, characterized in that, The capacitor-inductor filter module includes a first capacitor, a first inductor, and a second inductor. The first capacitor and the first inductor are connected in parallel, and both the first capacitor and the first inductor are connected in series with the second inductor. Both the first capacitor and the first inductor are electrically connected to the input terminal, and the output terminal is electrically connected to the second inductor.
8. The antenna system according to claim 1, characterized in that, The metal housing includes a first sidewall, and the plurality of antenna regions are located close to the first sidewall.
9. The antenna system according to claim 1, characterized in that, The metal housing includes a base plate and a frame surrounding the base plate. One end of the grounding connector is connected to the frame, and the other end of the grounding connector is connected to the base plate.
10. A mobile terminal, characterized in that, Includes the antenna system according to any one of claims 1-9.