Multi-frequency antenna with double low-frequency branches

Abstract

The utility model discloses a multi-frequency antenna with double low-frequency branches, which is characterized in that a first antenna main body, a feeding point, a first antenna branch, a second antenna branch and a third antenna branch are arranged on an antenna radiation unit, and a second antenna main body, a ground feeding point and a fourth antenna branch are arranged on an antenna coupling unit. The first antenna branch, part of the second antenna branch, the third antenna branch and the feeding point are all located on the plane where the second antenna main body is located, and the other part of the second antenna branch and the fourth antenna branch are all located on the plane where the first antenna main body is located. An antenna tuning switch and an FPC connecting line for providing power supply and logic control for the switch are not needed, and the first antenna main body and the second antenna main body are superposed to realize coverage of multiple frequency bands, so that the design difficulty and the cost of the whole machine are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of antenna technology, and in particular relates to a multi-frequency antenna with dual low-frequency branches. Background Technology

[0002] Tablets and laptops, as mobile terminal devices, have been continuously penetrating various fields for many years, especially in education, office work, and industry. In recent years, with the development of AI and 5G technologies, these technologies have been widely applied to tablets, further expanding their application scenarios and user experience, leading to increased market demand. However, finding high-performance, cost-effective antennas for tablets and laptops has become a key challenge.

[0003] Current mainstream design methods use tuning switches to switch between different frequency bands, allowing the antenna to cover multiple application frequency bands. However, in tablet computers, most overall designs use a separate motherboard as the core, with the antenna fed to a separate antenna board via a coaxial cable (for easier motherboard compatibility and more suitable antenna placement). This antenna board requires a tuning switch, and also necessitates an FPC connection between the motherboard and the antenna board to provide power and logic control for the switch, thus increasing the complexity and cost of the overall design. Therefore, there is an urgent need for a multi-frequency antenna with dual low-frequency branches to solve the aforementioned technical problems. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a multi-frequency antenna with dual low-frequency branches. By superimposing multiple low-frequency resonances through antenna wiring, different frequency band requirements can be met. This eliminates the need for antenna tuning switches and FPC connection lines that require power supply and logic control for the switches. Multi-frequency coverage is achieved by superimposing the two low-frequency branches, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a multi-frequency antenna with dual low-frequency branches. The multi-frequency antenna with dual low-frequency branches includes an antenna radiating element and an antenna coupling element. The antenna radiating element includes a first antenna body, a feed point, a first antenna branch, a second antenna branch, and a third antenna branch. The first antenna branch is disposed at one end of the first antenna body. One end of the second antenna branch is close to the first antenna branch. The other end of the second antenna branch is connected to the feed point and the first antenna body. The third antenna branches are arranged at intervals between the first antenna branch and the feed point.

[0007] The antenna coupling unit includes a second antenna body connected to the other end of the first antenna body, a feed point, and a fourth antenna branch. The feed point is located at one end of the second antenna body and close to the feed point. The fourth antenna branch is located at the other end of the second antenna body and close to the first antenna body. The first antenna branch, a portion of the second antenna branch, the third antenna branch, and the feed point are all located in the plane of the second antenna body, while another portion of the second antenna branch and the fourth antenna branch are located in the plane of the first antenna body.

[0008] As a preferred embodiment of the above technical solution, the multi-frequency antenna with dual low-frequency branches further includes a first groove and a second groove. The first groove is located along the first antenna branch, passing through the first antenna body and extending into the second antenna branch. The second groove is located between the connection point of the first antenna body and the second antenna body and the feed point. The first groove and the second groove are used to adjust the antenna impedance.

[0009] As a preferred embodiment of the above technical solution, the first groove is provided with a gap between the first antenna body and the second antenna branch on the side near the feed point.

[0010] As a preferred embodiment of the above technical solution, the second antenna branch is provided with first stress holes arranged at intervals along the length of the slot.

[0011] As a preferred embodiment of the above technical solution, the first antenna body on both sides of the second groove is provided with second stress holes arranged at intervals.

[0012] As a preferred embodiment of the above technical solution, the second antenna body is provided with positioning holes symmetrical about the second groove.

[0013] As a preferred embodiment of the above technical solution, the fourth antenna branch is provided with a plurality of spaced third stress holes.

[0014] As a preferred embodiment of the above technical solution, the third antenna branch is provided with an antenna parasitic branch close to the first antenna branch.

[0015] As a preferred embodiment of the above technical solution, the first antenna branch and the fourth antenna branch are both wiring branches of a low-frequency antenna, the second antenna branch is a wiring branch of an intermediate-frequency antenna, and the third antenna branch is a wiring branch of a high-frequency antenna.

[0016] As a preferred embodiment of the above technical solution, the second antenna body further includes a fifth antenna branch, one end of which extends along the length direction of the second antenna body, and the other end of which is connected to the fourth antenna branch.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] By setting a first antenna body, a feed point, a first antenna branch, a second antenna branch, and a third antenna branch on the antenna radiating unit, and setting a second antenna body, a feed point, and a fourth antenna branch on the antenna coupling unit, the first antenna branch, part of the second antenna branch, the third antenna branch, and the feed point are all located in the plane where the second antenna body is located, while another part of the second antenna branch and the fourth antenna branch are all located in the plane where the first antenna body is located. By using the antenna routing method, multiple low-frequency resonances can be superimposed to meet the requirements of different frequency bands. There is no need for an antenna tuning switch and an FPC connection line that provides power and logic control for the switch. The superposition of the first antenna body and the second antenna body achieves multiple frequency band coverage, thereby reducing the design difficulty and overall cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the multi-frequency antenna with dual low-frequency branches proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the multi-frequency antenna with dual low-frequency branches proposed in this utility model;

[0021] Figure 3 This is an assembly diagram of the multi-frequency antenna with dual low-frequency branches proposed in this utility model;

[0022] Figure 4 The efficiency test results of the dual low-frequency branch multi-frequency antenna proposed in this invention are shown in the range of 690MHz-960MHz.

[0023] Figure 5 The efficiency test diagram of the dual low-frequency branch multi-frequency antenna proposed in this utility model in the range of 1710MHz-2700MHz is shown.

[0024] The main component symbols are as follows:

[0025] 1-Multi-frequency antenna with dual low-frequency branches; 10-Antenna radiating element; 11-First antenna body; 12-Feed point; 13-First antenna branch; 14-Second antenna branch; 15-Third antenna branch; 20-Antenna coupling element; 21-Second antenna body; 22-Feed point; 23-Fourth antenna branch; 30-First groove; 31-Second groove; 32-Gap; 33-First stress hole; 34-Second stress hole; 35-Third stress hole; 36-Positioning hole; 37-Antenna parasitic branch; 38-Fifth antenna branch. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] See Figure 1 and Figure 2 This utility model provides a multi-frequency antenna 1 with dual low-frequency branches. The multi-frequency antenna 1 with dual low-frequency branches includes an antenna radiating element 10 and an antenna coupling element 20. The antenna radiating element 10 includes a first antenna body 11, a feed point 12, a first antenna branch 13, a second antenna branch 14, and a third antenna branch 15. The first antenna branch 13 is disposed at one end of the first antenna body 11. One end of the second antenna branch 14 is close to the first antenna branch 13, and the other end of the second antenna branch 14 is connected to the feed point 12 and the first antenna body 11. The third antenna branch 15 is arranged at intervals between the first antenna branch 13 and the feed point 12.

[0029] The antenna coupling unit 20 includes a second antenna body 21 connected to the other end of the first antenna body 11, a feed point 22, and a fourth antenna branch 23. The feed point 22 is located at one end of the second antenna body 21 and close to the feed point 12. The fourth antenna branch 23 is located at the other end of the second antenna body 21 and close to the first antenna body 11. The first antenna branch 13, part of the second antenna branch 14, the third antenna branch 15, and the feed point 12 are all located in the plane of the second antenna body 21, and another part of the second antenna branch 14 and the fourth antenna branch 23 are all located in the plane of the first antenna body 11.

[0030] In this embodiment, the multi-frequency antenna 1 with dual low-frequency branches further includes a first groove 30 and a second groove 31. The first groove 30 is located along the first antenna branch 13, passing through the first antenna body 11 and extending into the second antenna branch 14. The second groove 31 is located between the connection between the first antenna body 11 and the second antenna body 21 and the feed point 22. The first groove 30 and the second groove 31 are used to adjust the antenna impedance. A gap 32 is provided on the side of the first groove 30 near the feed point 22, located between the first antenna body 11 and the second antenna branch 14. The second antenna branch 14 is provided with first stress holes 33 arranged at intervals along the length direction of the gap 32. Second stress holes 34 are arranged at intervals on the first antenna body 11 on both sides of the second groove 31. The second antenna body 21 is provided with positioning holes 36 symmetrical about the second groove 30. The fourth antenna branch 23 is provided with a plurality of third stress holes 35 arranged at intervals. The third antenna branch 15 is provided with an antenna parasitic branch 37 near the first antenna branch 13. The first antenna branch 13 and the fourth antenna branch 23 are both wiring branches of low-frequency antennas, the second antenna branch 14 is a wiring branch of intermediate-frequency antennas, and the third antenna branch 15 is a wiring branch of high-frequency antennas.

[0031] Specifically, the first antenna low-frequency branch is formed by extending from the feed point 12 through the first antenna body 11 near the first groove 30 and to the first antenna branch 13. Figure 2 The dashed line (a) extends from the feed point 12, through the first antenna body 11, near the second groove 30, and through the second antenna body 21 to the fourth antenna branch 23, forming the second antenna low-frequency branch. Figure 2 (b) In the dashed line, the length of the first antenna low-frequency branch and the second antenna low-frequency branch is about 1 / 4 wavelength of the low-frequency band of cellular communication; the first antenna low-frequency branch and the second antenna low-frequency branch resonate and superimpose when the low frequency is formed, and the bandwidth requirement of 700-960MHz of low frequency can be realized through the first antenna body 11.

[0032] Specifically, the length from the feed point 12 to the end of the second antenna branch 14 is approximately 1 / 4 wavelength of the intermediate frequency band in cellular communication, in order to form an intermediate frequency resonance (IF). Figure 2 (dotted line c); In antenna coupling unit 20, the antenna high-frequency branch is formed from the third antenna branch 15 to the antenna parasitic branch 37. Figure 2 (d) In the dashed line, the high-frequency branch of the antenna is coupled to the first antenna body 11; at the bend of the U-shaped branch of the low-frequency branch of the second antenna (where it connects with the fourth antenna branch 23), the fifth antenna branch 38 extends to form a low-frequency double harmonic resonance. The fifth antenna branch 38, together with the second antenna branch 14 and the antenna parasitic branch 37, forms a relatively wide broadband coverage in the mid-to-high frequency range.

[0033] It should be noted that the first antenna branch 13 is U-shaped and extends from the second antenna branch 14 along the first antenna body 11 to the second antenna branch 14. The first groove 30 is a non-sealed groove. The first groove 30 at one end of the second antenna branch 14 near the first antenna branch 13 has an opening. The first groove 30 and the gap 32 form a transverse inverted "P" shape. Multiple evenly distributed first stress holes 33 are provided on the second antenna branch 14 to facilitate bending the second antenna branch 14. The third antenna branch 15 is square-shaped and has parasitic branches 37 to amplify the resonant frequency. The feed point 12 connects to the second antenna branch 14 and the first antenna body 11. The feed point 12 is located between the third antenna branch 15 and the feed point 22. Second stress holes 34 are provided on the first antenna body 11 on both sides of the second groove 31. Multiple second stress holes 34 are provided on the first antenna body 11 from the feed point 12 through the second groove 31, and multiple second stress holes 34 are provided from the second groove 31 to the connection point between the first antenna body 11 and the second antenna body 21. The second stress holes 34 are open holes, while the first stress holes 33 are circular holes. Positioning holes 36 are provided on the second antenna body 21 on both sides of the second groove 31. One of the positioning holes 36 is located precisely at the connection point between the feed point 22 and the second antenna body 21. Stress holes are also provided at the connection point between the first antenna body 11 and the second antenna body 21. The fourth antenna branch 23 is provided with a plurality of spaced third stress holes 35. The third stress holes 35 are open holes. Stress holes are provided at the connection between the fourth antenna branch 23 and the second antenna body 21. Preferably, all the stress holes are located on the same horizontal line to facilitate subsequent bending and installation and avoid damage to the antenna.

[0034] The first groove 30 and the second groove 31 are mainly used for antenna impedance adjustment between the feed point 12 and the feed point 22. The first groove 30 and the second groove 31 have roughly the same shape and size, and the feed point 12 and the feed point 22 have roughly the same shape and size. The low frequency coverage is 700MHz. In actual installation or use, the first antenna body 11 and the second antenna body 21 are located on two planes respectively. That is, the first antenna body 11, part of the second antenna branch 14 and the fourth antenna branch 23 are located on the same plane, and the first antenna branch 13, another part of the second antenna branch 14, the third antenna branch 15, the feed point 12, the feed point 22 and the second antenna body 21 are located on the same plane. The first antenna body 11 and the second antenna body 21 are coupled to form a resonance. The fifth antenna branch 38, which is away from the second groove 31 at one end of the second antenna body 21, is located on the low frequency branch of the second antenna ( Figure 2The branches (wiring stubs) extending from the bend of the dashed line b) can form low-frequency harmonics and mid-to-high frequency superposition to increase the mid-to-high frequency bandwidth. Among them, the first stress hole 33, the second stress hole 34, and the third stress hole 35 are flush (the centers can be located on the same horizontal line) and can serve as the bend of the multi-frequency antenna 1 with dual low-frequency branches, which facilitates the assembly of the overall antenna structure.

[0035] See Figure 3 , Figure 4 and Figure 5 , Figure 3 For the configuration of the dual low-frequency branch multi-frequency antenna 1 in a complete device (such as a mobile phone), please refer to [link / reference]. Figure 4 and Figure 5 The total antenna efficiency tested under the overall system configuration is as follows: Due to multi-mode superposition and slightly poor antenna S-parameters, the antenna radiation efficiency is improved by increasing the overall antenna volume, thus meeting the overall efficiency requirements despite slightly higher return loss. Among these factors, Figure 4 and Figure 5 The horizontal axis represents bandwidth (MHz), and the vertical axis represents total test efficiency (%). When performing antenna VSWR and Return Loss tests in the whole system state, the multi-frequency antenna with dual low-frequency branches uses multiple branches to superimpose multiple resonant modes, achieving a wider broadband coverage. In particular, the low-frequency band can meet the requirements of multiple low-frequency bands without the need for a tuning switch.

[0036] It should be understood that by setting the first antenna body 11, feed point 12, first antenna branch 13, second antenna branch 14 and third antenna branch 15 on the antenna radiating unit 10, and setting the second antenna body 21, feed point 22 and fourth antenna branch 23 on the antenna coupling unit 20, the first antenna branch 13, part of the second antenna branch 14, the third antenna branch 15 and feed point 12 are all located in the plane of the second antenna body 21, and the other part of the second antenna branch 14 and the fourth antenna branch 23 are all located in the plane of the first antenna body 11. By using the antenna routing method, multiple low-frequency resonances can be superimposed to meet the requirements of different frequency bands. There is no need for an antenna tuning switch and an FPC connection line that provides power and logic control for the switch. The superposition of the first antenna body 11 and the second antenna body 21 achieves multiple frequency band coverage, thereby reducing the design difficulty and overall cost.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-frequency antenna with dual low-frequency branches, characterized in that, The dual low-frequency branch multi-frequency antenna includes an antenna radiating element and an antenna coupling element. The antenna radiating element includes a first antenna body, a feed point, a first antenna branch, a second antenna branch, and a third antenna branch. The first antenna branch is disposed at one end of the first antenna body. One end of the second antenna branch is close to the first antenna branch. The other end of the second antenna branch is connected to the feed point and the first antenna body. The third antenna branches are arranged at intervals between the first antenna branch and the feed point. The antenna coupling unit includes a second antenna body connected to the other end of the first antenna body, a feed point, and a fourth antenna branch. The feed point is located at one end of the second antenna body and close to the feed point. The fourth antenna branch is located at the other end of the second antenna body and close to the first antenna body. The first antenna branch, a portion of the second antenna branch, the third antenna branch, and the feed point are all located in the plane of the second antenna body, while another portion of the second antenna branch and the fourth antenna branch are located in the plane of the first antenna body.

2. The multi-frequency antenna with dual low-frequency branches according to claim 1, characterized in that, The multi-frequency antenna with dual low-frequency branches further includes a first groove and a second groove. The first groove is located along the first antenna branch, passing through the first antenna body and extending into the second antenna branch. The second groove is located between the connection between the first antenna body and the second antenna body and the feed point. The first groove and the second groove are used to adjust the antenna impedance.

3. The multi-frequency antenna with dual low-frequency branches according to claim 2, characterized in that, The first groove has a gap located between the first antenna body and the second antenna branch on the side near the feed point.

4. The multi-frequency antenna with dual low-frequency branches according to claim 3, characterized in that, The second antenna branch is provided with first stress holes arranged at intervals along the length of the slot.

5. The multi-frequency antenna with dual low-frequency branches according to claim 2, characterized in that, The first antenna body on both sides of the second groove is provided with second stress holes arranged at intervals.

6. The multi-frequency antenna with dual low-frequency branches according to claim 5, characterized in that, The second antenna body is provided with positioning holes symmetrical about the second groove.

7. The multi-frequency antenna with dual low-frequency branches according to claim 1, characterized in that, The fourth antenna branch is provided with multiple spaced-apart third stress holes.

8. The multi-frequency antenna with dual low-frequency branches according to claim 1, characterized in that, The third antenna branch is provided with an antenna parasitic branch close to the first antenna branch.

9. The multi-frequency antenna with dual low-frequency branches according to claim 1, characterized in that, The first antenna branch and the fourth antenna branch are both wiring branches of low-frequency antennas, the second antenna branch is a wiring branch of intermediate-frequency antennas, and the third antenna branch is a wiring branch of high-frequency antennas.

10. The multi-frequency antenna with dual low-frequency branches according to claim 9, characterized in that, The second antenna body also includes a fifth antenna branch, one end of which extends along the length of the second antenna body, and the other end of which is connected to the fourth antenna branch.

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