Antenna structure and terminal device

Abstract

The present disclosure relates to an antenna structure and a terminal device, the antenna structure comprising a main branch and a first branch, the first branch being arranged at a side of the main branch provided with a first feeding point, the first branch being provided with a first grounding point, wherein the antenna structure further comprises a floating branch arranged between the main branch and the first branch, so that the ground return current of the first branch is away from the first feeding point of the main branch. In this way, the ground return muscle of the parasitic branch is broken, and the floating arrangement is changed. The first branch and the first grounding point are arranged beside the floating branch to guide the parasitic current to return to the ground. The position of the first grounding point is adjusted in the direction away from the first feeding point, the distance between the ground return current of the first branch and the first feeding point is increased, the current path of the antenna structure is changed, the excitation of the metal devices near the antenna by the ground return current is avoided, the spurious wave generated in the working frequency band of the antenna structure is reduced, and the radiation performance of the antenna is improved.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to an antenna structure and a terminal device using the antenna structure. Background Technology

[0002] With the continuous development of communication technology, antennas are required to cover more and more frequency bands. When multiple antennas are stacked to the extreme in terminal equipment, the antenna clearance area is getting smaller and smaller. There are many metal devices around the antenna. Under the excitation of current, the complex surrounding environment may generate clutter, which can become a source of interference that affects the radiation performance of the antenna. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides an antenna structure and a terminal device using the antenna structure.

[0004] According to a first aspect of the present disclosure, an antenna structure is provided, including a main branch and a first branch, wherein the first branch is arranged at intervals on one side of the main branch having a first feed point, and the first branch has a first ground point.

[0005] The antenna structure further includes a suspended stub disposed between the main stub and the first stub, so that the ground return current of the first stub is far away from the first feed point of the main stub.

[0006] Optionally, the main stub has a first end near the suspended stub and a second end away from the first end, the first feed point is disposed near the first end, and the antenna structure has at least one of the following operating modes:

[0007] The first operating mode is a quarter-wavelength mode from the first feed point to the first end of the main branch;

[0008] The second operating mode is a loop current mode from the first feed point through a portion of the main branch, the suspended branch, and a portion of the first branch to the first ground point; and

[0009] The third operating mode is the quarter-wavelength mode of the first branch.

[0010] Optionally, the suspended branch has a first end and a second end, the first end forming a first coupling gap with the main branch, and the second end forming a second coupling gap with the first branch.

[0011] The first coupling gap and the second coupling gap are configured as follows:

[0012] The main branch, the suspended branch, and the first grounding point form a zero-order mode.

[0013] Optionally, the current directions of some of the main branches, the suspended branches, and some of the first branches are the same.

[0014] Optionally, the suspended branch and the first branch are arranged at intervals, such that the suspended branch and the first grounding point are disconnected.

[0015] Optionally, the first branch is a long strip structure, and in the length direction, the first grounding point is located on the side of the first branch closest to the suspended branch.

[0016] Optionally, the first feed point and the first ground point generate a signal for covering the first operating frequency band, and the main branch is further provided with a second feed point and a second ground point to generate a signal for covering the second operating frequency band.

[0017] Optionally, the first operating frequency band includes the WIFI 5G frequency band, and the second operating frequency band is the WIFI 2.4G frequency band.

[0018] Optionally, the first operating frequency band may also include the WIFI 6E frequency band.

[0019] Optionally, the main branch is an L-shaped structure, the first power supply point and the second power supply point are located on the horizontal section of the L-shaped structure, the second grounding point is located on the vertical section of the L-shaped structure, and the first power supply point is located near the end of the horizontal section.

[0020] According to a second aspect of the present disclosure, a terminal device is provided, including the antenna structure described above.

[0021] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: the return-to-ground rib position of the parasitic branch is broken and changed to a suspended arrangement to form a suspended branch. At the same time, a first branch and a first grounding point are set next to the suspended branch to guide the parasitic current back to ground. The signal on the main branch is first coupled to the suspended branch and then coupled to the first branch. The position of the first grounding point is adjusted to be farther away from the first feed point, which increases the distance between the return-to-ground current of the first branch and the first feed point, changes the current path of the antenna structure, avoids the excitation of metal devices near the antenna by the return-to-ground current, reduces the generation of clutter in the operating frequency band of the antenna structure, and thus improves the radiation performance of the antenna structure.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0024] Figure 1 This is a schematic diagram illustrating an antenna structure according to exemplary embodiments of the present disclosure.

[0025] Figure 2 This is a schematic diagram illustrating an antenna structure according to an exemplary embodiment.

[0026] Figure 3 This is a schematic diagram illustrating a current path of an antenna structure according to an exemplary embodiment.

[0027] Explanation of reference numerals in the attached figures

[0028] 11-Main branch; 12-First branch; 13-Suspended branch; 14-Parasitic branch; 101-First feed point; 102-First grounding point; 103-Second feed point; 104-Second grounding point; 105-First coupling gap; 106-Second coupling gap. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0030] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0031] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the drawing orientation of the corresponding figures, and the terms "first," "second," etc., are used to distinguish different parts and do not have sequential or importance. Furthermore, in the following description, when referring to the figures, unless otherwise explained, the same reference numerals in different figures denote the same or similar elements.

[0032] In the relevant embodiments of this disclosure, such as Figure 1As shown, a combo antenna is provided, including a main stub 11. The main stub 11 adopts a dual-fed scheme, with a first feed point 101 and a second feed point 103. WIFI 5G operates in a quarter-wavelength mode from the first feed point 101 to the end of the main stub 11. A parasitic stub 14 is added on one side, with a first ground point 102 on the parasitic stub 14. This can form a loop mode from the first feed point 101 to the return-to-ground port of the parasitic stub 14, used to improve the sideband efficiency of WIFI 5G and expand the bandwidth. However, in this embodiment, the return-to-ground current of the parasitic stub 14 is relatively close to the first feed point 101, which can excite surrounding metal devices to generate clutter, affecting the radiation performance of WIFI 5G. Here, taking the application of this combo antenna to a mobile phone as an example, the surrounding metal devices can be metal components such as the phone frame, camera module, or microphone.

[0033] To solve the above problems, such as Figure 2 As shown, this disclosure provides an antenna structure including a main branch 11 and a first branch 12. The main branch 11 is provided with a first feed point 101, and the first branch 12 is arranged at intervals on the side of the main branch 11 where the first feed point 101 is provided. The first branch 12 is provided with a first ground point 102. The antenna structure also includes a suspended branch 13 disposed between the main branch 11 and the first branch 12, so that the ground return current of the first branch 12 is far away from the first feed point 101 of the main branch 11.

[0034] In the antenna structure provided in this disclosure, the ground return rib of the parasitic stub 14 is broken and replaced with a suspended arrangement to form a suspended stub 13. At the same time, a first stub 12 and a first grounding point 102 are set next to the suspended stub 13 to guide the parasitic current back to ground. The signal on the main stub 11 is first coupled to the suspended stub 13 and then coupled to the first stub 12. The position of the first grounding point 102 is adjusted away from the first feed point 101, which increases the distance between the ground return current of the first stub 12 and the first feed point 101, changes the current path of the antenna structure, avoids the excitation of the ground return current on the metal devices near the antenna, reduces the generation of clutter in the operating frequency band of the antenna structure, and thus improves the radiation performance of the antenna structure.

[0035] like Figure 3As shown, the main branch 11 has a first end near the suspended branch 13 and a second end away from the first end. The first feed point 101 is disposed near the first end. The antenna structure provided in this disclosure has at least one of the following operating modes: a first operating mode, a quarter-wavelength mode from the first feed point 101 to the first end of the main branch 11, used to generate a signal covering the WIFI 5G frequency band; a second operating mode, a loop current mode from the first feed point 101 through part of the main branch 11, the suspended branch 13, and part of the first branch 12 to the first ground point 102, used to improve the sideband efficiency of the WIFI 5G frequency band and expand the bandwidth; and a third operating mode, a quarter-wavelength mode of the first branch 12, which can also expand the bandwidth. Accordingly, the antenna structure can generate a signal for covering the WIFI 6E frequency band. Through the above three modes, the antenna structure can not only have good efficiency in the WIFI 5G frequency band, but also have excellent radiation performance in the wider WIFI 6E frequency band.

[0036] In this disclosure, Figure 1 In the illustrated embodiment, the return rib of the parasitic branch 14 is broken and replaced with a suspended arrangement. A first branch 12 is set next to the suspended branch 13, and a first grounding point 102 is set on the first branch 12 to guide the parasitic current back to ground. Furthermore, considering that the first grounding point 102 is located on the first branch 12, the suspended branch 13 and the first branch 12 are arranged alternately. In this way, the suspended branch 13 is disconnected from the first grounding point 102. This separates the first grounding point 102 (a strong current point) from the suspended branch 13, reduces the coupling current on the suspended branch 13, and disperses multiple currents, achieving the effect of reducing the SAR value (parabolic index, stop-loss point reversal index).

[0037] like Figure 2 As shown, the suspended stub 13 has a first end and a second end. A first coupling gap 105 is formed between the first end and the main stub 11, and a second coupling gap 106 is formed between the second end and the first stub 12. By adjusting the phase through the gap coupling capacitor, a portion of the main stub 11, the suspended stub 13, and the first grounding point 102 can form a zero-order mode, as shown. Figure 3As shown, the current directions of some main branches 11, suspended branches 13, and part of the first branch 12 are the same, increasing the radiation length of the current in the same direction. The field strengths are superimposed, improving the radiation performance of WIFI 5G by 0.5-1 dB. Furthermore, the zero-order mode and the quarter-wavelength mode of the newly added first branch 12 broaden the operating bandwidth of the antenna structure, giving it excellent radiation performance in the WIFI 6E band. Here, by adjusting the width of the first coupling slot 105 and the second coupling slot 106, and the length or width of the main branches 11, suspended branches 13, and the first branch 12, the size of the gap coupling capacitance can be adjusted, thereby achieving phase adjustment. This can be designed according to specific needs.

[0038] In this disclosure, the main branch 11, the first branch 12, and the suspended branch 13 can be designed with any suitable structure. In this embodiment, the first branch 12 can be an elongated structure, with the first grounding point 102 located on the side of the first branch 12 closest to the suspended branch 13 along its length. The length of the first branch 12 and the relative positions of the first grounding point 102 and the first branch 12 can be adjusted as needed.

[0039] like Figure 2 As shown in this disclosure, the first feed point 101 and the first ground point 102 generate signals for covering a first operating frequency band, which includes the WIFI 5G band. Of course, as described above, the frequency band covered by this antenna structure can be broadened using the zero-order mode and the quarter-wavelength mode of the first stub 12. Accordingly, the first operating frequency band also includes the WIFI 6E band. The main stub 11 is also provided with a second feed point 103 and a second ground point 104 to generate signals for covering a second operating frequency band, which can be the WIFI 2.4G band.

[0040] In this embodiment, the main branch 11 can be an L-shaped structure. The first feed point 101 and the second feed point 103 are located on the horizontal section of the L-shaped structure, and the second grounding point 104 is located on the vertical section of the L-shaped structure. The first feed point 101 is located near the end of the horizontal section. In other embodiments, the main branch 11 can also be elongated, and the positions of the first feed point 101, the second feed point 103, and the second grounding point 104 can be adjusted and arranged as needed.

[0041] In the antenna structure provided in this disclosure, a floating stub 13 is added to the end of a conventional combo antenna to generate a unidirectional current and construct a zero-order mode, which can improve the overall radiation performance of the WIFI 5G band. A first stub 12 and a first grounding point 102 are added next to the floating stub 13 for grounding, guiding the current back to ground at a position away from the combo antenna, avoiding excitation of the metal devices around the antenna structure, and avoiding the generation of clutter that affects the radiation performance of WIFI 5G. At the same time, the floating stub 13 and the first grounding point 102 are separated, and the floating stub 13 is kept away from the high current, reducing the coupling current on the floating stub 13 and dispersing multiple currents to achieve the effect of reducing the SAR value.

[0042] According to a second aspect of this disclosure, a terminal device is also provided, which may be a mobile phone, computer, tablet, or various wearable devices, etc., and the terminal device includes the antenna structure described above. This terminal device possesses all the beneficial effects of the aforementioned antenna structure, which will not be elaborated upon here. This terminal device can guarantee radiation performance in the WIFI 5G and WIFI 2.4G bands, while also exhibiting good radiation performance in the wider WIFI 6E band.

[0043] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of this disclosure. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0044] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An antenna structure, characterized in that, It includes a main branch and a first branch, the first branch being arranged at intervals on one side of the main branch where the first feed point is located, and the first branch having a first grounding point. The antenna structure further includes a suspended stub disposed between the main stub and the first stub, so that the ground return current of the first stub is far away from the first feed point of the main stub. The first grounding point is located on the side of the first stub closest to the suspended stub, and the antenna structure has a ring current pattern from the first feed point through part of the main stub, the suspended stub, part of the first stub to the first grounding point, and the current directions of part of the main stub, the suspended stub and part of the first stub are the same.

2. The antenna structure according to claim 1, characterized in that, The main stub has a first end near the suspended stub and a second end away from the first end, the first feed point is disposed near the first end, and the antenna structure has at least one of the following operating modes: The first operating mode is a quarter-wavelength mode from the first feed point to the first end of the main branch; as well as The third operating mode is the quarter-wavelength mode of the first branch.

3. The antenna structure according to claim 2, characterized in that, The suspended branch has a first end and a second end, the first end forming a first coupling gap with the main branch, and the second end forming a second coupling gap with the first branch. Wherein, the first coupling gap and the second coupling gap are configured such that the main branch, the suspended branch and the first grounding point form a zero-order mode.

4. The antenna structure according to claim 1, characterized in that, The suspended branch and the first branch are arranged at intervals so that the suspended branch and the first grounding point are disconnected.

5. The antenna structure according to claim 1, characterized in that, The first branch has a long, narrow structure.

6. The antenna structure according to any one of claims 1-5, characterized in that, The first feed point and the first ground point generate signals for covering the first operating frequency band, and the main branch is also provided with a second feed point and a second ground point to generate signals for covering the second operating frequency band.

7. The antenna structure according to claim 6, characterized in that, The first operating frequency band includes the 5G WIFI band, and the second operating frequency band is the 2.4G WIFI band.

8. The antenna structure according to claim 7, characterized in that, The first operating frequency band also includes the WIFI 6E band.

9. The antenna structure according to claim 6, characterized in that, The main branch has an L-shaped structure. The first power supply point and the second power supply point are located on the horizontal section of the L-shaped structure, and the second grounding point is located on the vertical section of the L-shaped structure. The first power supply point is located near the end of the horizontal section.

10. A terminal device, characterized in that, The antenna structure includes any one of claims 1-9.

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