Broadband built-in antenna and mobile terminal

Abstract

The utility model discloses a broadband built-in antenna and a mobile terminal. The broadband built-in antenna comprises a low-frequency branch unit, a medium-high frequency branch unit, a load end, a feeding point and a ground feeding point. The low-frequency branch unit is connected with the medium-high frequency branch unit, and a first gap is formed between the low-frequency branch unit and the medium-high frequency branch unit; the medium-high frequency branch unit is located between the low-frequency branch unit and the load end; the feeding point and the ground feeding point are both located between the medium-high frequency branch unit and the load end, one ends of the feeding point and the ground feeding point are both connected with the medium-high frequency branch unit, and the other ends are both connected with the load end; the low-frequency branch unit comprises a plurality of low-frequency sub-branches; and a second gap is formed between the adjacent low-frequency sub-branches. According to the utility model, the antenna performance requirement can be met, and the material use cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of microwave antennas, in particular to a broadband built-in antenna and a mobile terminal. Background Art

[0002] At present, the competition in terminal electronic consumer products is fierce. With the advent of the 5G era, the functions are highly integrated, the space layout is becoming more and more compact, and the appearance requirements are also getting higher and higher. As a result, the clearance environment for antenna layout will become worse and worse. Therefore, in the limited structural space, it is necessary to consider the mutual influence of antenna layout and the cost advantage of the scheme, and the difficulty of realizing the antenna scheme is also increasing.

[0003] Among them, low-cost design (cost performance) is one of the main factors of market competitiveness. The traditional FPC broadband built-in antenna scheme usually adopts the following method: the medium and high frequencies are tuned by the way of trace branches, and the low frequencies are mainly realized by the tuner switching (700 - 960 MHz) to achieve the full bandwidth (700 - 960 MHz, 1710 - 2700 MHz). However, this method has a high cost due to the use of a tuner.

[0004] Therefore, there is an urgent need to propose a broadband built-in antenna and a mobile terminal to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to propose a broadband built-in antenna and a mobile terminal, which can not only meet the antenna performance requirements but also reduce the material usage cost.

[0006] To solve the above technical problems, the utility model provides a broadband built-in antenna, including: a low-frequency branch unit, a medium and high-frequency branch unit, a load end, a feeding point, and a grounding point;

[0007] The low-frequency branch unit is connected to the medium and high-frequency branch unit, and there is a first gap between the low-frequency branch unit and the medium and high-frequency branch unit; the medium and high-frequency branch unit is located between the low-frequency branch unit and the load end; both the feeding point and the grounding point are located between the medium and high-frequency branch unit and the load end, and one end of both the feeding point and the grounding point is connected to the medium and high-frequency branch unit, and the other end is connected to the load end;

[0008] The low-frequency branch unit includes a plurality of low-frequency sub-branches; there is a second gap between adjacent low-frequency sub-branches.

[0009] Further, the size of the first gap is 0.5 mm - 1 mm.

[0010] Further, the size of the second gap is 0.5 mm - 1 mm.

[0011] Furthermore, a set spacing is provided between the feeding point and the grounding point.

[0012] Furthermore, the set spacing is 5 mm to 10 mm.

[0013] Furthermore, one end of the low-frequency stub unit is connected to one end of the medium-high frequency stub unit to form a first closed end; the other end of the low-frequency stub unit and the other end of the medium-high frequency stub unit form a first open end; a first gap is formed among the first closed end, the low-frequency stub unit, the medium-high frequency stub unit, and the first open end.

[0014] Furthermore, one ends of multiple low-frequency sub-stubs are all connected to form a second closed end; the other end of the low-frequency sub-stub and the other end of the adjacent low-frequency sub-stub form a second open end; a second gap is formed among the second closed end, the adjacent low-frequency sub-stubs, and the second open end.

[0015] Furthermore, the opening directions of the first open end and the second open end are the same.

[0016] Furthermore, the multiple low-frequency sub-stubs include a first low-frequency stub and a second low-frequency stub; one end of the first low-frequency stub is connected to one end of the second low-frequency stub; a second gap is provided between the first low-frequency stub and the second low-frequency stub; a first gap is provided between the first low-frequency stub and the medium-high frequency stub unit.

[0017] In addition, the present utility model further provides a mobile terminal, including the broadband built-in antenna as described above.

[0018] By the above technical solution, the present utility model has the following beneficial effects:

[0019] By providing the low-frequency stub unit, the medium-high frequency stub unit, the load end, the feeding point, and the grounding point; and the low-frequency stub unit is connected to the medium-high frequency stub unit, and a first gap is provided between the low-frequency stub unit and the medium-high frequency stub unit; the medium-high frequency stub unit is located between the low-frequency stub unit and the load end; the feeding point and the grounding point are both located between the medium-high frequency stub unit and the load end, and one ends of the feeding point and the grounding point are both connected to the medium-high frequency stub unit, and the other ends are both connected to the load end; the low-frequency stub unit includes multiple low-frequency sub-stubs; a second gap is provided between adjacent low-frequency sub-stubs. This device can not only meet the antenna performance requirements but also reduce the material usage cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the broadband built-in antenna in an embodiment of the present utility model;

[0021] Figure 2 The S11 effect diagram of the broadband built-in antenna without using a tuner in an embodiment of the present utility model;

[0022] Figure 3 The overall structural schematic diagram of the broadband built-in antenna in the prior art;

[0023] Figure 4 The S11 effect diagram of the broadband built-in antenna in the prior art using a tuner to expand the low-frequency bandwidth;

[0024] Figure 5 The comparison diagram of the low-frequency passive effects between the broadband built-in antenna of this embodiment and the broadband built-in antenna in the prior art;

[0025] Figure 6 The comparison diagram of the low-frequency active effects between the broadband built-in antenna of this embodiment and the broadband built-in antenna in the prior art;

[0026] Figure 7 The comparison diagram of the high-frequency passive effects between the broadband built-in antenna of this embodiment and the broadband built-in antenna in the prior art;

[0027] Figure 8 The comparison diagram of the high-frequency active effects between the broadband built-in antenna of this embodiment and the broadband built-in antenna in the prior art.

[0028] In the figure, 1 is the low-frequency stub unit; 11 is the first low-frequency stub; 12 is the second low-frequency stub; 2 is the medium-high frequency stub unit; 3 is the load end; 4 is the feeding point; 5 is the grounding point; 6 is the first slit; 7 is the second slit. Detailed implementation manners

[0029] The following will describe a broadband built-in antenna and a mobile terminal of the present utility model in more detail with reference to the accompanying drawings, which show the preferred embodiments of the present utility model. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the advantageous effects of the present utility model. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present utility model.

[0030] In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the embodiments of the present utility model.

[0031] As Figure 1 shown, an embodiment of the present utility model provides a broadband built-in antenna, including: a low-frequency stub unit 1, a medium-high frequency stub unit 2, a load end 3, a feeding point 4, and a grounding point 5.

[0032] Specifically, the low-frequency stub unit 1 is connected to the medium-high-frequency stub unit 2, and there is a first gap 6 between the low-frequency stub unit 1 and the medium-high-frequency stub unit 2 to generate a first low-frequency resonance and medium-high frequency; the medium-high-frequency stub unit 2 is located between the low-frequency stub unit 1 and the load end 3; both the feeding point 4 and the grounding point 5 are located between the medium-high-frequency stub unit 2 and the load end 3, and one end of both the feeding point 4 and the grounding point 5 is connected to the medium-high-frequency stub unit 2, and the other end is connected to the load end 3; the low-frequency stub unit 1 includes a plurality of low-frequency sub-stubs; there is a second gap 7 between adjacent low-frequency sub-stubs to generate a plurality of low-frequency resonances. Since this embodiment does not rely on a tuner to achieve low-band coverage, it reduces the material cost and manufacturing cost, and improves the cost performance of the product. By precisely designing the positions and sizes of the stubs and gaps, effective resonances of low frequency and medium-high frequency are achieved, thus ensuring the high performance of the antenna within a wide frequency band. It is applicable to various mobile terminal devices, such as mobile phones, tablets, etc., and has good market application prospects.

[0033] Preferably, the number of low-frequency sub-stubs and the second gap 7 can be set according to the actual low-frequency bandwidth requirements. By increasing the number of gaps in the low-frequency stub unit 1, the low-frequency bandwidth can be extended.

[0034] In a specific embodiment, for example, the plurality of low-frequency sub-stubs include a first low-frequency stub 11 and a second low-frequency stub 12; one end of the first low-frequency stub 11 is connected to one end of the second low-frequency stub 12; there is the second gap 7 between the first low-frequency stub 11 and the second low-frequency stub 12; there is the first gap 6 between the first low-frequency stub 11 and the medium-high-frequency stub unit 2, which can generate a second low-frequency resonance. If there are also a third low-frequency stub and a fourth low-frequency stub, and there are also a third gap and a fourth gap, a third low-frequency resonance and a fourth low-frequency resonance can be generated. By increasing the low-frequency stubs and gaps, more low-frequency resonances can be generated, thereby expanding the frequency coverage range of the antenna and meeting the requirements of more frequency bands. The frequency response characteristics of the antenna can be flexibly designed according to specific application requirements by adjusting the number of low-frequency stubs and the size of the gaps. By precisely controlling the parameters of the low-frequency stubs and gaps, the performance of the antenna at each resonant frequency point can be optimized, and the overall performance of the antenna can be improved. By optimizing the design of the stubs and gaps, a wider frequency coverage can be achieved within a limited space, which is beneficial to the integration of the antenna with mobile terminal devices.

[0035] In one embodiment, the size range of the first slot 6 is between 0.5 mm and 1 mm. For example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. As those skilled in the art will know, the specific size of the first slot 6 can be set according to actual requirements. By precisely controlling the size of the first slot 6, the resonant frequency of the antenna in the low-frequency band can be precisely adjusted to meet specific frequency coverage requirements. An appropriate slot size helps to optimize the performance of the antenna in a specific frequency range, such as gain, radiation pattern, and bandwidth. The size range of 0.5 mm to 1 mm facilitates production using existing manufacturing processes and equipment, helping to maintain production efficiency and quality. This size range enables the antenna design to adapt to different mobile terminal devices, such as mobile phones, tablets, etc., improving the versatility and market adaptability of the antenna.

[0036] In one embodiment, the size range of the second slot 7 is between 0.5 mm and 1 mm. For example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. As those skilled in the art will know, the specific size of the second slot 7 can be set according to actual requirements. By precisely controlling the size of the second slot 7, the resonant frequency of the antenna in the low-frequency band can be precisely adjusted to meet specific frequency coverage requirements. An appropriate slot size helps to optimize the performance of the antenna in a specific frequency range, such as gain, radiation pattern, and bandwidth. This size range enables the antenna design to adapt to different mobile terminal devices, such as mobile phones, tablets, etc., improving the versatility and market adaptability of the antenna. An appropriate slot size helps to improve the reliability and durability of the antenna because an overly large slot may affect the structural stability, while an overly small slot may limit the performance.

[0037] In one embodiment, there is a set spacing between the feeding point 4 and the grounding point 5. By adjusting the spacing between the feeding point 4 and the grounding point 5, the resonant frequency of the antenna can be affected, thereby achieving coverage of a specific frequency band. An appropriate spacing helps to achieve good impedance matching between the antenna and the feeder, reducing reflection losses and improving the radiation efficiency of the antenna. By precisely controlling the spacing, the antenna performance can be optimized without adding additional components, helping to control costs. An appropriate spacing helps with the integration of the antenna with other components of the mobile terminal device (such as the circuit board, battery, etc.), improving the overall design compactness.

[0038] Preferably, the range of the set spacing is between 5 mm and 10 mm. For example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc. It is known to those skilled in the art that the specific size of the set spacing can be set according to actual requirements. Within this spacing range, the resonant frequency of the antenna can be effectively controlled to cover the required frequency band while maintaining the stability of resonance. Within this spacing range, it is easier to achieve impedance matching between the antenna and the feeder, thereby reducing signal reflection and transmission loss. An appropriate spacing helps reduce the mutual interference between the internal components of the antenna, especially in compact mobile terminal devices. By optimizing within this spacing range, the manufacturing cost can be controlled without sacrificing performance, improving the market competitiveness of the product.

[0039] In a specific example, one end of the low-frequency stub unit 1 is connected to one end of the medium-high frequency stub unit 2 to form a first closed end; the other end of the low-frequency stub unit 1 and the other end of the medium-high frequency stub unit 2 form a first open end; a first gap 6 is formed between the first closed end, the low-frequency stub unit 1, the medium-high frequency stub unit 2, and the first open end. The setting of the first closed end and the first open end helps to form a resonant cavity, which can enhance the resonant performance of the antenna within a specific frequency range. The formation of the first gap 6 helps to generate resonance in the low-frequency band, thereby improving the radiation efficiency and coverage ability of the antenna in the low-frequency band. By adjusting the structures of the first closed end and the first open end, the radiation pattern of the antenna can be optimized to better meet the requirements of specific application scenarios. The setting of the first closed end and the first open end helps to improve the impedance matching between the antenna and the feeder, reduce signal reflection, and improve signal transmission efficiency. The formation of the first gap 6 helps to improve the frequency selectivity of the antenna, enabling the antenna to work more effectively within a specific frequency range.

[0040] In this embodiment, one ends of multiple low-frequency sub-stubs are all connected to form a second closed end; the other end of the low-frequency sub-stub and the other end of the adjacent low-frequency sub-stub form a second open end; a second gap 7 is formed between the second closed end, the adjacent low-frequency sub-stubs, and the second open end. The formation of the second gap 7 helps to generate additional resonance in the low-frequency band, thereby enhancing the performance of the antenna in the low-frequency band. Through the setting of the second gap 7, the frequency coverage range of the antenna can be further extended, especially in the low-frequency band. The setting of the second closed end and the second open end helps to improve the impedance matching between the antenna and the feeder, reduce signal reflection, and improve signal transmission efficiency. The formation of the second gap 7 helps to improve the frequency selectivity of the antenna, enabling the antenna to work more effectively within a specific frequency range. In multi-band operation, the second gap 7 helps to isolate signals in different frequency bands and reduce interference between frequency bands.

[0041] Preferably, the opening directions of the first opening end and the second opening end are the same. The same opening direction helps to enhance the radiation ability of the antenna in a specific direction, which is very beneficial for improving the directional transmission efficiency and communication quality of signals. The unified opening direction helps to form a more optimized radiation pattern, which is very beneficial for improving the communication quality and signal coverage. The same opening direction helps to reduce signal interference in different frequency bands or different directions, improve the purity of the signal and the reliability of communication, simplifies the overall layout of the antenna, makes the design process more intuitive and easy to control, and also improves the design consistency.

[0042] In addition, this embodiment also proposes a mobile terminal, including the broadband built-in antenna as described above. The mobile terminal can be, for example, a mobile phone and a tablet computer, etc.

[0043] In this embodiment, the feeding point 4 receives the signal of the wireless device and transmits it to the grounding point 5, while the first low-frequency branch 11 and the second low-frequency branch 12 respectively generate low-frequency and medium-high-frequency resonances through the setting of the second slot 7 and the first slot 6 between the second low-frequency branch 12 and the medium-high-frequency branch unit 2, so as to cover the ultra-wideband frequency range from 700 MHz to 2700 MHz. The load end 3 is connected to the feeding point 4 and the grounding point 5 to ensure the effective transmission and radiation of the signal. Thereby, it can avoid the tuner used in traditional antennas, reduce the cost and improve the performance and flexibility of the antenna, making it suitable for mobile terminal devices such as mobile phones and tablets.

[0044] This embodiment obtains the effect as Figure 2 without using a tuner, while Figure 3 the conventional antenna in the prior art can obtain the effect diagram as Figure 4 shown by using a tuner to expand the low-frequency bandwidth. By combining and comparing Figure 2 and Figure 4 , the comparison of low-frequency passive effects Figure 5 , the comparison of low-frequency active effects Figure 6 , the comparison of high-frequency passive effects Figure 7 and the comparison of high-frequency active effects Figure 8 can be obtained. It can be seen that this embodiment can not only reduce the cost, but also improve the performance and flexibility of the antenna.

[0045] In summary, a broadband built-in antenna and a mobile terminal proposed by the present utility model have the following advantages:

[0046] Through the settings of the low-frequency stub unit, the medium-high frequency stub unit, the load end, the feeding point and the feeding ground point; and the low-frequency stub unit is connected to the medium-high frequency stub unit, and there is a first gap between the low-frequency stub unit and the medium-high frequency stub unit; the medium-high frequency stub unit is located between the low-frequency stub unit and the load end; both the feeding point and the feeding ground point are located between the medium-high frequency stub unit and the load end; one ends of the feeding point and the feeding ground point are both connected to the medium-high frequency stub unit, and the other ends are both connected to the load end; the low-frequency stub unit includes a plurality of low-frequency sub-stubs; there is a second gap between adjacent low-frequency sub-stubs. This device can not only meet the antenna performance requirements, but also reduce the material usage cost.

[0047] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. A broadband internal antenna, characterized in that: include: Low frequency branch unit, medium and high frequency branch unit, load end, feeding point and feeding point; The low-frequency branch unit is connected to the medium-high frequency branch unit, and a first gap is provided between the low-frequency branch unit and the medium-high frequency branch unit; the medium-high frequency branch unit is located between the low-frequency branch unit and the load end; the feeding point and the feeding point are both located between the medium-high frequency branch unit and the load end, and one end of the feeding point and the feeding point are both connected to the medium-high frequency branch unit, and the other end is both connected to the load end; The low-frequency branch unit includes a plurality of low-frequency sub-branches; and a second gap is formed between adjacent low-frequency sub-branches.

2. The broadband internal antenna according to claim 1, characterized in that: The size of the first gap is 0.5 mm to 1 mm.

3. The broadband internal antenna according to claim 1, characterized in that: The size of the second gap is 0.5 mm to 1 mm.

4. The broadband internal antenna according to claim 1, characterized in that: There is a set distance between the feeding point and the feeding point.

5. The broadband internal antenna according to claim 4, characterized in that: The set spacing is 5 mm to 10 mm.

6. The broadband internal antenna according to claim 1, characterized in that: One end of the low-frequency branch unit is connected to one end of the medium- and high-frequency branch unit to form a first closed end; the other end of the low-frequency branch unit and the other end of the medium- and high-frequency branch unit form a first open end; the first gap is formed between the first closed end, the low-frequency branch unit, the medium- and high-frequency branch unit, and the first open end.

7. The broadband internal antenna according to claim 6, characterized in that: One ends of the multiple low-frequency sub-branches are all connected to form a second closed end; the other end of the low-frequency sub-branch and the other end of the adjacent low-frequency sub-branch form a second open end; the second gap is formed between the second closed end, the adjacent low-frequency sub-branch and the second open end.

8. The broadband internal antenna according to claim 7, characterized in that: The first opening end and the second opening end have the same opening direction.

9. The broadband internal antenna according to claim 1, characterized in that: The multiple low-frequency sub-branches include a first low-frequency branch and a second low-frequency branch; one end of the first low-frequency branch is connected to one end of the second low-frequency branch; there is the second gap between the first low-frequency branch and the second low-frequency branch; there is the first gap between the first low-frequency branch and the medium and high-frequency branch unit.

10. A mobile terminal, characterized in that: It comprises a broadband internal antenna as described in any one of claims 1 to 9.

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