Dual-band WLAN antenna and mobile terminal

Abstract

The invention discloses a dual-band WLAN antenna and a mobile terminal, and relates to the technical field of antennae, the dual-band WLAN antenna comprises a dielectric substrate, an antenna floor and a dipole antenna, the antenna floor is arranged on the upper surface of the dielectric substrate; the dipole antenna comprises a first dipole branch knot and a second dipole branch knot, the first dipole branch knot and the second dipole branch knot are both connected to the antenna floor, an opening gap is formed between the first dipole branch knot and the second dipole branch knot, and the length of the opening gap is larger than the longitudinal length of the first dipole branch knot and the longitudinal length of the second dipole branch knot. The first dipole branch extends and bends back to the second dipole branch to form a first bending portion, and the second dipole branch extends and bends back to the first dipole branch to form a second bending portion.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a dual-band WLAN antenna and a mobile terminal. Background Art

[0002] In recent years, with the rapid development of wireless communications, the working frequency bands of WLAN (wireless local area network) have become more and more numerous and complex. At the same time, due to the demand for high speed and large channel capacity, the bandwidth of WLAN frequency bands has become wider and wider. In order to meet the needs of different standards in various countries and be compatible with existing WLAN frequency bands, the new generation of WLAN antennas needs to have the characteristics of broadband and multi-band.

[0003] Dipole antennas are widely used in mobile terminal devices due to their simple structure, easy integration and bidirectional radiation. However, due to the compact space in mobile terminal devices, dipole antennas are often limited to a lower clearance height and face the problem of too narrow bandwidth. How to expand the bandwidth of the antenna in a smaller installation space still needs further solution. Summary of the invention

[0004] The main purpose of the present invention is to provide a dual-band WLAN antenna and a mobile terminal, aiming to expand the bandwidth of the antenna in a smaller installation space.

[0005] To achieve the above object, the dual-band WLAN antenna proposed in the present invention includes:

[0006] dielectric substrate;

[0007] An antenna floor, the antenna floor being arranged on the upper surface of the dielectric substrate;

[0008] A dipole antenna, the dipole antenna comprising a first dipole branch and a second dipole branch, the first dipole branch and the second dipole branch are both connected to the antenna floor, an open gap is formed between the first dipole branch and the second dipole branch, the length of the open gap is greater than the longitudinal length of the first dipole branch and the second dipole branch, the first dipole branch extends and bends away from the second dipole branch to form a first bending portion, and the second dipole branch extends and bends away from the first dipole branch to form a second bending portion.

[0009] In one embodiment, the dual-band WLAN antenna also includes a feed line, the feed line includes an inner conductor and an outer conductor distributed in a radial direction, the outer conductor is coated on the periphery of the inner conductor, the first dipole branch is formed with a grounding hole, the second dipole branch is formed with a feeding hole, the outer conductor is connected to the antenna floor through the grounding hole, and the inner conductor is connected to the second dipole branch through the feeding hole.

[0010] In one embodiment, the grounding hole is provided at a connection position between the first dipole branch and the antenna floor, and the feeding hole is provided at a connection position between the second dipole branch and the antenna floor.

[0011] In one embodiment, the first bending portion and the second bending portion are both arranged in a step shape.

[0012] In one embodiment, a chamfer is formed at one end of the first dipole branch close to the second dipole branch.

[0013] In one embodiment, the first bending portion and the second bending portion are symmetrically arranged along the opening gap, a first rectangular notch is formed at the connection portion between the antenna floor and the second dipole branch, and one side of the first rectangular notch is flush with the inner edge of the second dipole branch.

[0014] In one embodiment, the first bending portion and the second bending portion are asymmetrically designed, a second rectangular notch is formed at a connection portion between the antenna floor and the first dipole branch, and one side of the second rectangular notch is parallel to the opening gap.

[0015] In one embodiment, the second dipole branch extends laterally in a direction away from the first dipole branch to form an open branch, and the open branch is located between the second bending portion and the antenna floor.

[0016] In one embodiment, along the length direction of the opening slit, the width of the opening slit close to the chamfered end is smaller than the width of the opening slit far from the chamfered end.

[0017] The present invention further provides a mobile terminal, the mobile terminal comprising a dual-band WLAN antenna, the dual-band WLAN antenna comprising:

[0018] dielectric substrate;

[0019] An antenna floor, the antenna floor being arranged on the upper surface of the dielectric substrate;

[0020] A dipole antenna, the dipole antenna comprising a first dipole branch and a second dipole branch, the first dipole branch and the second dipole branch are both connected to the antenna floor, an open gap is formed between the first dipole branch and the second dipole branch, the length of the open gap is greater than the longitudinal length of the first dipole branch and the second dipole branch, the first dipole branch extends and bends away from the second dipole branch to form a first bending portion, and the second dipole branch extends and bends away from the first dipole branch to form a second bending portion.

[0021] The technical solution of the present invention realizes resonance of two different frequency bands through a specific physical structure. The dielectric substrate and antenna floor of the antenna constitute the basic platform of the antenna. The first dipole branch and the second dipole branch form a dipole antenna. After the radio frequency current is passed through, a loop is formed to generate a changing electric field and magnetic field, which radiate outward in the form of electromagnetic waves. In addition, since an open gap is formed between the first dipole antenna and the second dipole antenna, a gap antenna is formed at the gap position after power is turned on, so that the antenna can resonate at two different frequencies, thereby covering two frequency bands. The bending design of the first and second dipole branches, that is, the first bending portion and the second bending portion, is used to further adjust the electrical characteristics of the antenna to optimize its performance in the two frequency bands. While maintaining a compact size, it provides wider frequency band coverage and higher radiation efficiency to meet the installation requirements of the antenna in the mobile terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A top view of Embodiment 1 of the dual-band WLAN antenna provided by the present invention;

[0024] Figure 2 for Figure 1 Side view of the dual-band WLAN antenna;

[0025] Figure 3 for Figure 1 Rear view of the dual-band WLAN antenna;

[0026] Figure 4 It is a schematic diagram of the electric field distribution of the slot antenna of the dual-band WLAN antenna of the present invention at 5.90 GHz;

[0027] Figure 5 It is a schematic diagram of the electric field distribution of the slot antenna of the dual-band WLAN antenna of the present invention at 7.35 GHz;

[0028] Figure 6 A top view of Embodiment 2 of the dual-band WLAN antenna provided by the present invention;

[0029] Figure 7 A schematic diagram of the S11 simulation results of the dual-band WLAN antenna provided by the present invention;

[0030] Figure 8A schematic diagram of a curve showing the simulated actual gain of the dual-band WLAN antenna provided by the present invention;

[0031] Fig. 9 It is a schematic diagram of the actual test results of the voltage standing wave ratio of Example 2 of the dual-band WLAN antenna provided by the present invention.

[0032] Description of Figure Numbers:

[0033] 1000. Dual-band WLAN antenna; 1. Dielectric substrate; 2. Antenna floor; 21a. First rectangular notch; 21b. Second rectangular notch; 3. Dipole antenna; 31. First dipole branch; 311. First bend; 312. Grounding hole; 32. Second dipole branch; 321. Second bend; 322. Feed hole; 323. Open branch; 4. Open gap; 5. Feed line; 51. Inner conductor; 52. Outer conductor.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] In recent years, with the rapid development of wireless communications, the working frequency bands of WLAN (wireless local area network) have become more and more numerous and complex. At the same time, due to the demand for high speed and large channel capacity, the bandwidth of WLAN frequency bands has become wider and wider. In order to meet the needs of different standards in various countries and be compatible with existing WLAN frequency bands, the new generation of WLAN antennas needs to have the characteristics of broadband and multi-band.

[0039] Dipole antennas are widely used in mobile terminal devices due to their simple structure, easy integration and bidirectional radiation. However, due to the compact space in mobile terminal devices, dipole antennas are often limited to a lower clearance height and face the problem of too narrow bandwidth. How to expand the bandwidth of the antenna in a smaller installation space still needs further solution.

[0040] To solve the above problems, please refer to Figures 1 to 9 The present invention proposes a dual-band WLAN antenna 1000, comprising a dielectric substrate 1, an antenna floor 2 and a dipole antenna 3, wherein the antenna floor 2 is arranged on the upper surface of the dielectric substrate 1; the dipole antenna 3 comprises a first dipole branch 31 and a second dipole branch 32, wherein the first dipole branch 31 and the second dipole branch 32 are both connected to the antenna floor 2, an open gap 4 is formed between the first dipole branch 31 and the second dipole branch 32, and the length of the open gap 4 is greater than the longitudinal length of the first dipole branch 31 and the second dipole branch 32, the first dipole branch 31 extends and bends away from the second dipole branch 32 to form a first bending portion 311, and the second dipole branch 32 extends and bends away from the first dipole branch 31 to form a second bending portion 321.

[0041] The technical solution of the present invention realizes resonance of two different frequency bands through a specific physical structure. The dielectric substrate 1 and the antenna floor 2 of the antenna constitute the basic platform of the antenna. The first dipole branch 31 and the second dipole branch 32 form a dipole antenna 3. After the radio frequency current is passed through, a loop is formed to generate a changing electric field and magnetic field, which radiate outward in the form of electromagnetic waves. In addition, since an open gap 4 is formed between the first dipole antenna 3 and the second dipole antenna 3, a gap antenna is formed at the gap position after power is turned on, so that the antenna can resonate at two different frequencies, thereby covering two frequency bands. The bending design of the first and second dipole branches 32, that is, the first bending portion 311 and the second bending portion 321, is used to further adjust the electrical characteristics of the antenna to optimize its performance in the two frequency bands. While maintaining a compact size, it provides wider frequency band coverage and higher radiation efficiency to meet the installation requirements of the antenna in the mobile terminal.

[0042] In an optional embodiment, in order to realize the feeding and grounding connection of the dual-band WLAN antenna 1000, the dual-band WLAN antenna 1000 further includes a feeding line 5, the feeding line 5 includes an inner conductor 51 and an outer conductor 52 distributed in a radial direction, the outer conductor 52 is coated on the periphery of the inner conductor 51, the first dipole branch 31 is formed with a grounding hole 312, the second dipole branch 32 is formed with a feeding hole 322, the outer conductor 52 is connected to the antenna floor 2 through the grounding hole 312, and the inner conductor 51 is connected to the second dipole branch 32 through the feeding hole 322. Please refer to Figures 1 to 3 The design of the inner conductor 51 and the outer conductor 52 in the feed line 5, and the way they are connected to the dipole branch, are crucial to ensuring effective signal transmission. The outer conductor 52 is connected to the antenna floor 2 through the grounding hole 312, which helps to provide a good ground plane, thereby reducing signal reflection and loss. The inner conductor 51 is connected to the second dipole branch 32 through the feed hole 322. By selecting a suitable feed position, the impedance matching of the dual-band WLAN antenna 1000 can be optimized and the signal transmission efficiency can be improved. This ensures the high performance of the antenna in the dual-band, and also simplifies the integration process of the antenna and the mobile terminal.

[0043] In an optional embodiment, in order to improve the dual-band effect of the dual-band WLAN antenna 1000, the grounding hole 312 is provided at the connection position between the first dipole branch 31 and the antenna floor 2, and the feeding hole 322 is provided at the connection position between the second dipole branch 32 and the antenna floor 2. Figures 1 to 3In this solution, the feed hole 322 and the ground hole 312 are both vertically opened on the dielectric substrate 1, and are respectively connected to the inner conductor 51 and the outer conductor 52 of the feed line 5, so as to input the radio frequency current to the dual-band WLAN antenna 1000. The connection position of the feed line 5 and the dual-band WLAN antenna 1000 divides the open gap 4 into two sections, the first section is the gap between the first dipole antenna 3 and the second dipole antenna 3, and the second section is the gap formed by the first section extending into the antenna floor 2, wherein the first section and the second section correspond to the 1 / 4 wavelength virtual short circuit mode and the 1 / 2 wavelength virtual short circuit mode respectively. The operating frequency of the first section slot antenna is 5.90 GHz, and the operating frequency of the second section slot antenna is 7.35 GHz, which is also conducive to expanding the bandwidth of the dual-band WLAN antenna 1000 and improving the working efficiency of the dual-band WLAN antenna 1000. In addition, the arrangement of the feed hole 322 and the ground hole 312 helps to optimize the current flow path, reduce signal reflection and loss, simplify the antenna manufacturing and assembly process, improve the antenna's structural stability and signal transmission reliability, and may also improve the antenna's manufacturing accuracy and consistency.

[0044] In an optional embodiment, to ensure the working efficiency of the dipole antenna 3, please refer to Figure 1 The first bend 311 and the second bend 321 are both arranged in a stepped shape. The stepped bend can provide more design freedom to adapt to different design requirements and frequency characteristics. It helps to improve the bandwidth characteristics of the antenna and achieve wider frequency band coverage without sacrificing performance. It enhances the frequency selectivity and radiation efficiency of the antenna, and may also improve the versatility of the antenna, so that it can adapt to more wireless communication applications.

[0045] In an optional embodiment, to improve the impedance matching of the dual-band WLAN antenna 1000, please refer to Figures 1 to 3 , a chamfer is formed at one end of the first dipole branch 31 close to the second dipole branch 32. Chamfers are usually used to reduce sharp edges, which is particularly important in antenna design. Sharp edges may cause unnecessary reflection and loss of signals. In addition, the gap formed between the first dipole branch 31 and the second dipole branch 32 can introduce additional capacitive components in the two frequency bands, thereby achieving the effect of improving impedance matching. By forming a chamfer at one end of the first dipole branch 31 close to the second dipole branch 32, the mutual interference between the first dipole branch 31 and the second dipole branch 32 can be reduced, thereby improving the radiation efficiency of the dual-band WLAN antenna 1000. The sharp transition between the branches is reduced, which helps to improve the impedance matching of the antenna, improve the performance of the antenna and the transmission quality of the signal, and also improve the aesthetics and durability of the dual-band WLAN antenna 1000.

[0046] To further improve the impedance matching of the dual-band WLAN antenna 1000, please refer to Figures 1 to 3 The first bend 311 and the second bend 321 are symmetrically arranged along the opening gap 4, and a first rectangular notch 21a is formed at the connection portion between the antenna floor 2 and the second dipole branch 32, and one side of the first rectangular notch 21a is flush with the inner edge of the second dipole branch 32. The symmetrical design of the first bend 311 and the second bend 321 can reduce the performance fluctuation caused by the asymmetry of the antenna, thereby improving the stability and reliability of the antenna. The design of the first rectangular notch 21a can introduce additional capacitive components in the two frequency bands to achieve the effect of improving impedance matching. In addition, the setting of the first rectangular notch 21a can also be used to adjust the resonant frequency of the dual-band WLAN antenna 1000, because it can affect the current distribution and radiation characteristics of the antenna, which helps to improve the bandwidth characteristics of the antenna, so that the dual-band WLAN antenna 1000 can achieve wider frequency band coverage without sacrificing performance, which helps to improve the overall wireless performance.

[0047] In another optional embodiment, to improve the impedance matching of the dual-band WLAN antenna 1000, please refer to Figure 6 The first bending portion 311 and the second bending portion 321 are asymmetrically designed, and a second rectangular notch 21b is formed at the connection portion between the antenna floor 2 and the first dipole branch 31, and one side of the second rectangular notch 21b is parallel to the opening gap 4. The asymmetrical design can provide more design freedom to meet specific performance requirements. In addition, the design of the second rectangular notch 21b can introduce additional capacitive components in two frequency bands to achieve the effect of improving impedance matching.

[0048] To further improve the impedance matching of the dual-band WLAN antenna 1000, please refer to Figure 6 The second dipole branch 32 extends laterally in a direction opposite to the first dipole branch 31 to form an open branch 323, and the open branch 323 is located between the second bent portion 321 and the antenna floor 2. The open branch 323 is used to provide an additional resonance point or improve the bandwidth characteristics of the antenna. The open branch 323 can introduce a capacitive component in the middle of the dual-band WLAN antenna 1000, which helps to fine-tune the impedance matching and improve the radiation efficiency of the dual-band WLAN antenna 1000.

[0049] For further information, please refer to Figure 6, along the length direction of the opening slot 4, the width of the opening slot 4 near the chamfered end is smaller than the width of the opening slot 4 away from the chamfered end. The slot antenna is located between the two dipole branches and embedded in the antenna floor 2. It shares part of the structure with the dipole antenna 3 near the slot antenna opening, and has the feature of structural reuse, which simplifies the overall structure of the dual-band WLAN antenna 1000. The change in the width of the opening slot 4 can be used to adjust the radiation pattern and directivity of the antenna. By changing the slot width, the current distribution and radiation characteristics of the antenna can be affected.

[0050] The structural principles of two embodiments of the dual-band WLAN antenna 1000 in this solution are described in detail below.

[0051] Embodiment 1:

[0052] Please refer to Figures 1 to 3 The dual-band WLAN antenna 1000 includes a first dipole branch 31, a second dipole branch 32, an antenna floor 2, a feeder 5, a feed hole 322, a ground hole 312, a dielectric substrate 1, and an opening slit 4. In this design, the first dipole branch 31, the second dipole branch 32, and the antenna floor 2 are all placed on the upper surface of the dielectric substrate 1, and the feeder 5 is located below the dielectric substrate 1. The inner conductor 51 of the feeder 5 is connected to the second dipole branch 32 through the feed hole 322, and the outer conductor 52 of the feeder 5 is connected to the antenna floor 2 through the ground hole 312. The first dipole branch 31 is directly connected to the antenna floor 2, and the corner position near the connection is chamfered. This design can introduce additional capacitive components in the two frequency bands to achieve the effect of improving impedance matching. And the first bending portion 311 is formed by extending and bending at the end, which has the effect of adjusting the antenna impedance matching. The second dipole branch 32 is directly connected to the antenna floor 2, and is extended and bent at the end to form a second bend 321, which has the effect of adjusting the impedance matching of the antenna. The slot antenna is located between the two dipole branches and embedded in the floor. It shares part of the structure with the two dipole branches near the opening of the slot antenna, and has the feature of structural reuse, making the antenna design more compact. The antenna floor 2 is a rectangular structure, and its size can be changed according to the actual application environment, and there is a rectangular notch near the root of the second dipole antenna 3 branch. The rectangular notch changes the current path of the antenna floor 2 and can adjust the impedance matching. The first dipole branch 31 and the second dipole branch 32 resonate in the low frequency band (2.38~2.59GHz). There is an open gap 4 between the first dipole branch 31 and the second dipole branch 32. The virtual short-circuit mode of the open gap 4 is introduced by the inner conductor 51 of the feed line 5. The two share some metal structures, and the open gap 4 resonates in the high frequency band (5.01-7.71 GHz), including two resonant modes, namely, a 1 / 4 wavelength virtual short-circuit mode and a 1 / 2 wavelength virtual short-circuit mode, which expands the bandwidth of the antenna.

[0053] Figure 7 The S11 simulation results of the dual-band WLAN antenna 1000 in this solution are shown. In the figure, the solid line a and the dotted line b respectively represent the reflection coefficient curves of the dual-band WLAN antenna 1000 before and after adding the impedance matching structure (including the trumpet-shaped opening of the first dipole branch 31 and the rectangular notch on the antenna floor 2). It can be seen from the figure that after adding the impedance matching structure, the dual-band WLAN antenna 1000 has a new resonance zero point in the low frequency band, and the bandwidth in the high frequency band is also increased. In addition, the dual-band WLAN antenna 1000 in this design has three resonance modes in the band, which can cover the two frequency bands of 2.38~2.59GHz and 5.01~7.71GHz, indicating that the dual-band WLAN antenna 1000 in this solution greatly improves the bandwidth of the antenna. Figure 8 This is a curve of the simulated actual gain of the dual-band WLAN antenna 1000 in this solution. It can be seen from the figure that the antenna has a relatively flat gain within the working frequency band, meeting the requirements of broadband communication. Figure 4 and Figure 5 Schematic diagrams of the electric field distribution of the slot antenna in this scheme at 5.90 GHz and 7.35 GHz, respectively corresponding to the 1 / 4 wavelength virtual short-circuit mode and the 1 / 2 wavelength virtual short-circuit mode, which expands the bandwidth of the antenna.

[0054] Embodiment 2:

[0055] Please refer to Figure 6 The dual-band WLAN antenna 1000 includes a first dipole branch 31, a second dipole branch 32, an antenna floor 2, a feed line 5, a feed hole 322, a ground hole 312, a dielectric substrate 1, and an open slot 4. The first bend 311 on the first dipole branch 31 is asymmetrical with the second bend 321 on the second dipole branch 32, and an open branch 323 is added at the connection position between the second dipole branch 32 and the antenna floor 2 to improve impedance matching. The slot antenna is located between the two dipole branches and embedded in the antenna floor 2. It shares part of the structure with the two dipole branches near the slot antenna opening, has the feature of structural reuse, and is widened at the tail of the slot antenna to adjust impedance matching. The quality factor of the slot 1 / 2 wavelength mode is reduced to increase the bandwidth of the mode. The antenna floor 2 is a rectangular structure, the size of which can be changed according to the actual application environment, and a rectangular notch is provided near the root of the first dipole branch 31 to adjust the impedance matching. The feed line 5 is orthogonal to the slot antenna, and can simultaneously excite the dipole antenna 3 and the slot antenna to form a dual-band effect. In the high frequency band, the slot antenna has two working modes: a 1 / 4 wavelength virtual short-circuit mode and a 1 / 2 wavelength virtual short-circuit mode, which has a broadband effect. Fig. 9The actual test result of the voltage standing wave ratio of Example 2 can completely cover the 2.4 GHz, 5 GHz, and 6 GHz frequency bands in the WiFi frequency band, meeting the actual application requirements of the dual-band WLAN antenna 1000.

[0056] The present invention also proposes a mobile terminal, which includes a dual-band WLAN antenna 1000. The dual-band WLAN antenna 1000 in this solution is suitable for portable devices, such as smart phones, tablet computers, etc. Integrating this dual-band WLAN antenna 1000 into a mobile terminal can improve the wireless communication capability of the device while maintaining the compactness and portability of the device. It also helps to improve the efficiency of the mobile terminal because it allows the mobile terminal to achieve effective communication on more frequency bands without the need to install other antennas. The specific structure of the dual-band WLAN antenna 1000 refers to the above-mentioned embodiment. Since the dual-band WLAN antenna 1000 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0057] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A dual-band WLAN antenna, characterized in that: include: dielectric substrate; An antenna floor, the antenna floor being arranged on the upper surface of the dielectric substrate; A dipole antenna, the dipole antenna comprising a first dipole branch and a second dipole branch, the first dipole branch and the second dipole branch are both connected to the antenna floor, an open gap is formed between the first dipole branch and the second dipole branch, the length of the open gap is greater than the longitudinal length of the first dipole branch and the second dipole branch, the first dipole branch extends and bends away from the second dipole branch to form a first bending portion, and the second dipole branch extends and bends away from the first dipole branch to form a second bending portion.

2. The dual-band WLAN antenna according to claim 1, wherein: The dual-band WLAN antenna also includes a feeder line, which includes an inner conductor and an outer conductor distributed in a radial direction, wherein the outer conductor is wrapped around the periphery of the inner conductor, the first dipole branch is formed with a grounding hole, the second dipole branch is formed with a feeding hole, the outer conductor is connected to the antenna floor through the grounding hole, and the inner conductor is connected to the second dipole branch through the feeding hole.

3. The dual-band WLAN antenna according to claim 2, wherein: The grounding hole is provided at a connection position between the first dipole branch and the antenna floor, and the feeding hole is provided at a connection position between the second dipole branch and the antenna floor.

4. The dual-band WLAN antenna according to claim 1, wherein: The first bending portion and the second bending portion are both arranged in a step shape.

5. The dual-band WLAN antenna according to any one of claims 1 to 4, characterized in that: An end of the first dipole branch close to the second dipole branch is chamfered.

6. The dual-band WLAN antenna according to claim 5, characterized in that: The first bending portion and the second bending portion are symmetrically arranged along the opening gap, a first rectangular notch is formed at the connection position between the antenna floor and the second dipole branch, and one side of the first rectangular notch is flush with the inner edge of the second dipole branch.

7. The dual-band WLAN antenna according to claim 5, characterized in that: The first bending portion and the second bending portion are asymmetrically designed, a second rectangular notch is formed at a connection position between the antenna floor and the first dipole branch, and one side of the second rectangular notch is parallel to the opening gap.

8. The dual-band WLAN antenna according to claim 7, wherein: The second dipole branch extends laterally in a direction away from the first dipole branch to form an open branch, and the open branch is located between the second bending portion and the antenna floor.

9. The dual-band WLAN antenna according to claim 8, wherein: In the length direction of the opening slit, the width of the opening slit close to the chamfered end is smaller than the width of the opening slit far from the chamfered end.

10. A mobile terminal, characterized in that: The invention comprises the dual-band WLAN antenna as claimed in any one of claims 1 to 9.

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