An antenna and a wireless device

Abstract

This invention relates to the field of antenna technology, and specifically discloses an antenna and a wireless device, including a substrate and an antenna body. The antenna body is at least partially mounted on the surface of the substrate. The antenna body includes a main stub, an adjustable stub, a feed point, and a ground plane. The main stub is at least partially mounted on the surface of the substrate. The feed point is located on the main stub, and the ground plane is coupled to the main stub. The adjustable stub is located on the main stub and can move along a first direction to adjust the antenna impedance. Through this method, the antenna of this invention can match the impedance of the antenna to the impedance of the feed line by moving the adjustable stub, thereby enhancing anti-interference capability and radiation efficiency.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to an antenna and a wireless device. Background Technology

[0002] Antennas, which convert current into electromagnetic waves and vice versa, are crucial for wireless networks. Radio frequency (RF) signals travel from the chip through a feed line to the antenna, where they are converted into radio waves and radiated outwards. To maximize RF signal radiation, the impedance of the feed line must match that of the antenna. A significant mismatch between the two impedances will cause most of the RF signal to be reflected, reducing radiation efficiency and severely impacting the communication distance and stability of the wireless network.

[0003] In the process of implementing the embodiments of the present invention, the inventors discovered that in actual use environments, the antenna is affected by factors such as wall obstruction or interference from multiple devices, causing the antenna impedance to shift, making it impossible for the antenna impedance to be completely matched with the impedance of the feed line. Summary of the Invention

[0004] The main technical problem solved by the embodiments of the present invention is to provide an antenna that addresses the issue of impedance mismatch between the antenna and the feed line when subjected to environmental interference.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide an antenna, including a substrate and an antenna body, wherein the antenna body is at least partially attached to the surface of the substrate, the antenna body includes a main branch, an adjustable branch, a feed point and a ground feed portion, the main branch is at least partially attached to the surface of the substrate, the feed point is disposed in the main branch, the ground feed portion is coupled to the main branch, the adjustable branch is disposed in the main branch, and the adjustable branch is capable of moving along a first direction in the main branch to adjust the impedance of the antenna.

[0006] Optionally, the antenna body is symmetrical about the perpendicular bisector of the substrate in a second direction, which is perpendicular to the first direction.

[0007] Optionally, the main branch includes a tip, a sliding part, and a connecting part. One end of the sliding part is connected to the tip, and the other end of the sliding part is connected to the connecting part. An adjustable branch is provided in the sliding part.

[0008] Optionally, along the second direction, the width of the connecting part is smaller than the width of the sliding part; The connecting portion includes a first connecting end and a second connecting end. One end of the first connecting end is connected to the sliding portion, and the other end of the first connecting end is connected to the second connecting end. Along the second direction, the width of the second connecting end is smaller than the width of the first connecting end. Optionally, the second connecting end extends out of the substrate along the first direction, and a power supply point is disposed at the second connecting end. The grounding section is provided with a groove extending in the first direction, the second connecting end extends into the groove and the power supply point is accommodated in the groove.

[0009] Optionally, the width of the tip gradually decreases in the second direction along the direction away from the sliding part.

[0010] Optionally, a gap is provided between the feed section and the main branch, and the feed section and the main branch are coupled by the gap.

[0011] Optionally, the ground feed portion has two protrusions on both sides along the second direction, and the two protrusions are symmetrical about the vertical line of the substrate in the second direction.

[0012] Optionally, along the second direction, the width w2 of the adjustable branch is greater than the width w1 of the main branch.

[0013] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a wireless device, including the antenna described above.

[0014] The beneficial effects of this invention are as follows: Unlike the prior art, this invention provides an antenna, including a substrate and an antenna body. The antenna body is at least partially attached to the surface of the substrate. The antenna body includes a main branch, an adjustable branch, a feed point, and a ground feed portion. The main branch is at least partially attached to the surface of the substrate. The feed point is located in the main branch. The ground feed portion is coupled to the main branch. The adjustable branch is located in the main branch and can move along a first direction to adjust the impedance of the antenna. Therefore, this antenna can match the impedance of the antenna with the impedance of the feed line by moving the adjustable branch, thereby enhancing anti-interference capability and radiation efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an antenna provided in an embodiment of the present invention; Figure 2 This is another schematic diagram of the antenna provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the antenna body of the antenna provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the main branch of the antenna body of the antenna provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the ground feed portion of the antenna body of the antenna provided in an embodiment of the present invention; Figure 6 This is a rendering of the adjustable antenna stub provided in an embodiment of the present invention; Figure 7 This is a return loss diagram of the movable stub of the antenna provided in an embodiment of the present invention located at a first position; Figure 8 This is the radiation pattern of the antenna at 2.4 GHz provided in the embodiment of the present invention; Figure 9 This is the actual gain diagram of the antenna at 5.5GHz provided in the embodiment of the present invention; Figure 10 This is the actual gain diagram of the antenna at 6.2GHz provided in the embodiment of the present invention; Figure 11 This is the actual gain diagram of the antenna at 7GHz provided in the embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 100. Antenna; 10. Substrate; 20. Antenna body; 21. Main branch; 211. Tip; 212. Sliding part; 213. Connecting part; 2131. First connecting end; 2132. Second connecting end; 22. Adjustable branch; 23. Feed point; 24. Ground feed part; 241. Groove; 242. Protrusion; 243. Feed point. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0020] Please see Figure 1 and Figure 2The antenna 100 includes a substrate 10 and an antenna body 20. The antenna body 20 is at least partially attached to the surface of the substrate 10, and the antenna body 20 is symmetrical about the perpendicular bisector of the substrate 10 in a second direction to ensure the symmetry of the radiation direction of the antenna 100.

[0021] It should be noted that the first direction is the y-direction, the second direction is the x-direction, and the third direction is the z-direction. The first, second, and third directions are perpendicular to each other.

[0022] For the substrate 10 described above, please refer to... Figure 1 and Figure 2 The substrate 10 has a symmetrical rectangular structure and can be made of materials such as FR-4, polydimethylsiloxane (PDMS) and polyimide.

[0023] For the antenna body 20 mentioned above, please refer to... Figures 1 to 5 The antenna body 20 includes a main branch 21, an adjustable branch 22, a feed point 23, and a ground feed portion 24. The main branch 21 is at least partially attached to the surface of the substrate 10. The feed point 23 is disposed on the main branch 21. The ground feed portion 24 is coupled to the main branch 21. The adjustable branch 22 is disposed on the main branch 21 and can move along a first direction on the main branch 21 to adjust the impedance of the antenna 100.

[0024] Along the first direction, the adjustable stub 22 moves away from the feed point 23, the distance between the adjustable stub 22 and the feed point 23 increases, the equivalent electrical length increases, the resonant frequency of the antenna 100 shifts to a lower frequency, and the S11 value corresponding to the resonant frequency also changes. The adjustable stub 22 moves closer to the feed point 23, the distance between the adjustable stub 22 and the feed point 23 shortens, the equivalent electrical length decreases, the resonant frequency of the antenna 100 shifts to a higher frequency, and the S11 value corresponding to the resonant frequency also changes.

[0025] In some embodiments, along the second direction, the width w2 of the adjustable branch 22 is greater than the width w1 of the main branch 21, so that when the main branch 21 moves along the first direction, the adjustable branch 22 completely covers the main branch 21, thereby expanding the working bandwidth.

[0026] For the main branch 21 mentioned above, please refer to Figure 1 , Figures 3 to 5The main branch 21 includes a tip 211, a sliding portion 212, and a connecting portion 213. One end of the sliding portion 212 is connected to the tip 211, and the other end of the sliding portion 212 is connected to the connecting portion 213. Both the tip 211 and the sliding portion 212 are disposed on the surface of the substrate 10. The adjustable branch 22 is disposed on the sliding portion 212. Along the direction away from the sliding portion 212, the width of the tip 211 gradually decreases in the second direction. In some embodiments, the tip 211 is trapezoidal or isosceles triangle. The tip 211 can form an electric field concentration effect, becoming a strong radiation region to improve the radiation efficiency of the antenna 100. Furthermore, the gradient structure of the tip 211 can also expand the operating bandwidth of the antenna 100, allowing the antenna 100 to maintain good radiation efficiency over a wider frequency range. The connecting portion 213 includes a first connecting end 2131 and a second connecting end 2132. One end of the first connecting end 2131 is connected to the sliding portion 212, and the other end of the first connecting end 2131 is connected to the second connecting end 2132. The second connecting end 2132 extends out of the substrate 10 along a first direction, and the feed point 23 is disposed on the second connecting end 2132. Along a second direction, the width of the second connecting end 2132 is smaller than the width of the first connecting end 2131, so as to better adjust the impedance of the antenna 100.

[0027] For the aforementioned ground feed section 24, please refer to... Figure 2 and Figure 5 A gap is provided between the ground feed section 24 and the main branch 21, and the ground feed section 24 and the main branch 21 are coupled by the gap. The ground feed section 24 is provided with a groove 241 extending along the first direction. The second connection end 2132 extends into the groove 241 and the feed point 23 is accommodated in the groove 241, which makes the feed point 23 and the main branch 21 more resistant to external radiation interference and improves the radiation efficiency of the antenna 100. The ground feed section 24 is provided with two protrusions 242 on both sides along the second direction. The two protrusions 242 are symmetrical about the perpendicular bisector of the substrate 10 in the second direction. The protrusions 242 are used to adjust the impedance by changing the ground inductance, ground capacitance and current return path.

[0028] In some embodiments, the ground feed portion 24 is provided with a ground point 243, and the ground point 243 is grounded to the ground plane, so that there is a complete current loop in the antenna 100.

[0029] The S11 value refers to "return loss," which is the proportion of reflected energy to input energy, measured in dB. It measures the impedance matching between antenna 100 and the feed line. A smaller S11 value indicates less reflected energy, with most of the energy being used for radiation, meaning the impedance matching between antenna 100 and the feed line is good. A larger S11 value indicates more reflected energy, with a lower proportion of the input energy being used for radiation, meaning the impedance matching between antenna 100 and the feed line is poor, resulting in most of the energy being lost through reflection.

[0030] The industry typically uses -10dB as the acceptable threshold. At this threshold, 90% of the energy can enter the antenna 100 and be radiated out, while 10% of the energy is reflected. When S11 is less than -10dB, the antenna 100 can have excellent communication performance.

[0031] Please see Figure 6 , Figure 6 The effect of the movement of the adjustable stub 22 relative to the main stub 21 on the resonant frequency and S11 value of the antenna 100 can be demonstrated. First, the position of the adjustable stub 22 relative to the main stub 21 is defined as the initial position. Let the initial position x=0, and curve A is obtained. Then, along the first direction, the adjustable stub 22 is moved by 2 units away from the feed point 23 in the direction away from the feed point 23. This position is defined as the first position. The first position x=-2, and curve B is obtained. Along the first direction, the adjustable stub 22 is moved by 2 units away from the feed point 23 in the direction closer to the feed point 23. This position is defined as the second position. The second position x=2, and curve C is obtained.

[0032] By observing and comparing curves A, B, and C, it can be seen that the resonant frequency of antenna 100 in the first position is less than the resonant frequency of antenna 100 in the initial position, and the resonant frequency of antenna 100 in the initial position is less than the resonant frequency of antenna 100 in the second position. That is, when the adjustable stub 22 moves away from the feed point 23, the resonant frequency moves to a lower frequency, and when the adjustable stub 22 moves closer to the feed point 23, the resonant frequency moves to a higher frequency. Therefore, antenna 100 can change its resonant frequency by moving the position of the adjustable stub 22.

[0033] The S11 value corresponding to the resonant frequency of the antenna 100 at the initial position is less than the S11 value corresponding to the resonant frequency of the antenna 100 at the first position, and the S11 value corresponding to the resonant frequency of the antenna 100 at the initial position is greater than the S11 value corresponding to the resonant frequency of the antenna 100 at the second position. Furthermore, it can be concluded that the S11 value corresponding to the same frequency is different when the adjustable stub 22 is in different positions. Therefore, the antenna 100 can change the S11 value of a certain frequency by moving the adjustable stub 22, thereby satisfying the user's desire for the antenna 100 to have excellent radiation performance at a certain frequency.

[0034] When the adjustable stub 22 is in the initial position, the first position, and the second position, the operating frequency band of the antenna 100 is not the same. The antenna 100 in the first position can operate at a frequency of 7 GHz, but the antenna 100 in the initial position and the antenna 100 in the second position cannot reach the qualified line of -10 dB at a frequency of 7 GHz. Similarly, at other frequencies, the S11 value of the antenna 100 in different positions is also different. That is, the antenna 100 in different positions has different operating frequency bands. Therefore, the antenna 100 can change its operating frequency band by moving the adjustable stub 22 to adapt to changes in the environment and user needs.

[0035] In summary, by moving the adjustable stub 22 along the first direction and changing its position relative to the main stub 21, the impedance of the antenna 100, as well as the S11 value and operating bandwidth of the antenna 100, can be changed. Furthermore, the operation of this antenna 100 is simple; the user only needs to move the position of the adjustable stub 22 to change the impedance of the antenna 100 according to environmental changes and requirements, in order to match the impedance of the feed line and improve the radiation efficiency of the antenna 100. This antenna 100 has a very strong anti-interference capability.

[0036] Please see Figure 7 , Figure 7 The figures show the S11 values ​​of antenna 100 in various frequency bands. The first marked point has a frequency of 2.4 GHz and an S11 value of -39.1327 dB. At this frequency, only 0.01% of the energy is reflected, and 99.99% of the energy is radiated through antenna 100. This indicates that the impedance of antenna 100 at this frequency is almost perfectly matched with the impedance of the feed line. The second marked point has a frequency of 2.5 GHz and an S11 value of -15.89442 dB. The frequency range between the first and second marked points includes the 2.4 GHz band (2400 MHz – 2483.5 MHz), and the S11 value within this range is less than -15.89 dB. This means that antenna 100 can communicate normally in the 2.4 GHz band and has excellent radiation efficiency.

[0037] The third marked point has a frequency of 5.15 GHz and an S11 value of approximately -10.99 dB. The fourth marked point has a frequency of 5.85 GHz and an S11 value of approximately -12.92 dB. The frequency range between the third and fourth marked points includes the 5 GHz band (5150 MHz - 5850 MHz), and the S11 value within this range is less than -10.99 dB. This means that antenna 100 can communicate normally in the 5 GHz band and has excellent radiation efficiency.

[0038] The fifth marked point has a frequency of 5.925 GHz and an S11 value of approximately -13.56 dB. The sixth marked point has a frequency of 7.125 GHz and an S11 value of approximately -9.24 dB. The frequency range between the fifth and sixth marked points includes the 6 GHz band (5925 MHz - 7125 MHz), and the S11 value within this range is less than -9.24 dB. This means that antenna 100 can communicate normally in most areas of the 5 GHz band and has good radiation efficiency.

[0039] In summary, the antenna 100 covers the 2.4GHz band (2400MHz–2483.5MHz), the 5GHz band (5150MHz–5850MHz), and the 6GHz band (5925MHz–7125MHz). That is, the antenna 100 is a tri-band antenna 100, and its impedance can be adjusted by moving the adjustable stub 22 to adapt to changes in the environment and user needs.

[0040] Figure 8 This is a polar coordinate diagram of the radiation directivity of antenna 100 at 2.4 GHz. It exhibits a typical symmetrical figure-eight double-lobed radiation pattern, which is a hallmark feature of linearly polarized dipole antenna 100. The maximum radiation direction is concentrated on the horizontal side at approximately 93°. The 0° and 180° positions along the axis of antenna 100 form deep radiation null points, with signal strength attenuating to below -40 dB. The maximum directivity coefficient of the main lobe is 2.06 dBi, the 3 dB beamwidth reaches 82.0°, the single lobe coverage range is approximately ±41°, and the double lobes together cover nearly 180° of horizontal space. There are no obvious sidelobes, and the energy is highly concentrated on the horizontal main lobe. In this low-frequency band, it exhibits standard linearly polarized omnidirectional radiation characteristics, which are fully suitable for the use requirements of 2.4 GHz short-range omnidirectional communication.

[0041] Figure 9 This is a polar coordinate graph of the actual gain of Antenna 100 at 5.5GHz (Wi-Fi 5G band). The actual gain has taken into account the actual engineering losses such as antenna 100 efficiency and impedance matching, which is closer to the actual performance in use. The radiation pattern has evolved from the double-lobed structure of 2.4GHz to a four-lobed "clover-shaped" radiation pattern. The maximum radiation direction of the main lobe has shifted to 127.0°. At the same time, obvious upper and lower sidelobes appear in the 0° and 180° directions. The sidelobe level is -4.9dB. The original deep radiation null point has been greatly reduced. The maximum actual gain of the main lobe has increased to 3.15dBi, which is about 1.1dBi higher than that of the 2.4GHz band. The 3dB beamwidth has been narrowed to 45.2°. The directivity of the main lobe has been significantly enhanced, and the coverage area is more concentrated. At high frequencies, Antenna 100 excites higher-order radiation modes while still maintaining linear polarization characteristics. The overall radiation performance meets the omnidirectional coverage requirements of 5GHz Wi-Fi.

[0042] Figure 10This is the actual gain polar coordinate diagram of Antenna 100 at 6.2GHz. It continues the four-lobed radiation pattern of the 5.5GHz band. The maximum radiation direction of the main lobe is further shifted to 129.0°. The maximum actual gain of the main lobe reaches 3.21dBi, which is the highest gain value in the entire band. The 3dB beamwidth is narrowed to 42.7°, and the directivity is further enhanced. The sidelobe level is optimized to -3.9dB, and the sidelobe energy ratio is slightly improved. The sidelobe shape in the 0° and 180° directions is fuller. The radiation null point has completely disappeared. The radiation uniformity in all angles has been further improved. Antenna 100 still maintains stable linear polarization radiation characteristics in this high frequency band. The multi-mode radiation mode is more mature and adaptable to the wireless communication needs of higher frequency bands.

[0043] Figure 11 This is the actual gain polar coordinate diagram of Antenna 100 at 7GHz. The four-lobed radiation pattern remains stable, the maximum radiation direction of the main lobe shifts to 135.0°, the maximum actual gain of the main lobe drops back to 2.61dBi, the 3dB beamwidth is further narrowed to 39.4°, the directivity reaches the strongest in the entire frequency band, the sidelobe level is optimized to -5.5dB, the sidelobe suppression effect is the best, the energy proportion of the sidelobe in the 0° and 180° directions is reduced, and the radiated energy is more concentrated in the main lobe. Antenna 100 still maintains linear polarization radiation characteristics in this high frequency band, and the multimode radiation mode is stable. Although the gain has dropped, the beam is more concentrated and the sidelobes are better, making it suitable for directional enhancement communication scenarios in the 7GHz band.

[0044] In summary, Antenna 100 is a broadband linearly polarized antenna covering 2.4GHz to 7GHz. In the 2.4GHz low-frequency band, it exhibits standard dipole double-lobe omnidirectional radiation characteristics with moderate gain, wide beam, and no sidelobes, perfectly meeting the 2.4G omnidirectional coverage requirements. As the operating frequency increases to 5.5GHz, 6.2GHz, and 7GHz, Antenna 100 gradually excites higher-order radiation modes, and the radiation pattern evolves from a double-lobe pattern to a stable four-lobe pattern. The main lobe gain first increases and then decreases, the beam continuously narrows, and the directivity gradually increases. The sidelobe level first increases and then decreases. It achieves the highest gain across the entire frequency band at 6.2GHz and optimal sidelobe suppression at 7GHz. It maintains linearly polarized radiation characteristics across the entire frequency band, and the null point gradually disappears as the frequency increases. The radiation uniformity across the entire angle is continuously optimized. It has the dual advantages of low-frequency omnidirectional coverage and high-frequency directional enhancement, and can adapt to the differentiated usage requirements of multi-band wireless communication.

[0045] To facilitate the reader's understanding of the present invention, the assembly process of the antenna 100 of the present invention is described below: The tip 211 is connected to one end of the sliding part 212, and the first connecting end 2131 of the connecting part 213 is connected to the other end of the sliding part 212 to complete the assembly of the main branch 21. The main branch 21 is attached to the surface of the substrate 10, and the second connecting end 2132 of the connecting part 213 extends out of the substrate 10 in the first direction. The feed point 23 is set at the second connecting end 2132, and the adjustable branch 22 is set at the sliding part 212. The groove 241 of the ground feed part 24 surrounds the second connecting end 2132, and the feed point 23 is also accommodated in the groove 241. A gap is left between the groove 241 and the main branch 21. The adjustable branch 22 is set at the main branch 21. At this time, the adjustable branch 22 can move along the first direction of the main branch 21 to adjust the impedance and S11 value of the antenna 100.

[0046] In this embodiment of the invention, the antenna 100 includes a substrate 10 and an antenna body 20. The antenna body 20 is at least partially attached to the surface of the substrate 10. The antenna body 20 includes a main branch 21, an adjustable branch 22, a feed point 23, and a ground feed portion 24. The main branch 21 is at least partially attached to the surface of the substrate 10. The feed point 23 is disposed on the main branch 21. The ground feed portion 24 is coupled to the main branch 21. The adjustable branch 22 is disposed on the main branch 21. The adjustable branch 22 can move along a first direction on the main branch 21 to adjust the impedance of the antenna 100. Therefore, the antenna 100 can match the impedance of the antenna 100 with the impedance of the feed line by moving the adjustable branch 22, which can enhance the anti-interference capability and enhance the radiation efficiency.

[0047] The present invention provides an embodiment of a wireless device, which includes the antenna 100 and a feed line (not shown in the figure) described above. The feed line is connected to the feed point 23. The structure and function of the antenna 100 can be referred to the above embodiment, and will not be described in detail here.

[0048] It should be noted that while the preferred embodiments of the present invention are given in the specification and accompanying drawings, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of the present invention; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of the present invention. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of the present invention specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An antenna, characterized in that, include: substrate; An antenna body, wherein the antenna body is at least partially attached to the surface of the substrate; The antenna body includes a main branch, an adjustable branch, a feed point, and a ground feed portion. The main branch is at least partially attached to the surface of the substrate. The feed point is disposed on the main branch. The ground feed portion is coupled to the main branch. The adjustable branch is disposed on the main branch and can move along a first direction on the main branch to adjust the impedance of the antenna body.

2. The antenna according to claim 1, characterized in that, The antenna body is symmetrical about the perpendicular bisector of the substrate in a second direction, which is perpendicular to the first direction.

3. The antenna according to claim 2, characterized in that, The main branch includes a tip, a sliding part, and a connecting part. One end of the sliding part is connected to the tip, and the other end of the sliding part is connected to the connecting part. The adjustable branch is disposed on the sliding part.

4. The antenna according to claim 3, characterized in that, Along the second direction, the width of the connecting portion is smaller than the width of the sliding portion; The connecting part includes a first connecting end and a second connecting end. One end of the first connecting end is connected to the sliding part, and the other end of the first connecting end is connected to the second connecting end. Along the second direction, the width of the second connecting end is smaller than the width of the first connecting end.

5. The antenna according to claim 4, characterized in that, The second connection end extends out of the substrate along the first direction, and the power supply point is disposed at the second connection end; The grounding portion is provided with a groove extending in a first direction, the second connecting end extends into the groove, and the power supply point is accommodated in the groove.

6. The antenna according to claim 3, characterized in that, Along the direction away from the sliding portion, the width of the tip gradually decreases in the second direction.

7. The antenna according to claim 1, characterized in that, A gap is provided between the ground feed section and the main branch, and the ground feed section and the main branch are coupled by the gap.

8. The antenna according to claim 7, characterized in that, The ground feed portion has two protrusions on both sides along the second direction, and the two protrusions are symmetrical about the perpendicular bisector of the substrate in the second direction.

9. The antenna according to any one of claims 1-8, characterized in that, Along the second direction, the width w2 of the adjustable branch is greater than the width w1 of the main branch.

10. A wireless device, characterized in that, Includes the antenna as described in any one of claims 1-9.

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