Multi-frequency antenna structure and mobile device

Abstract

The utility model provides a multi-frequency antenna structure and a mobile device. The multi-frequency antenna structure comprises an antenna substrate, an annular transmission antenna and a coupling antenna. The annular transmission antenna is arranged on the antenna substrate and comprises a feeding point, a first transmission radiator, a second transmission radiator and a ground point which are electrically connected in sequence and form an annular structure; the feeding point is electrically connected with the antenna substrate, and the ground point is electrically connected with the antenna substrate; the coupled antenna is arranged on the antenna substrate, the coupled antenna comprises a first coupling section, a second coupling section and a third coupling section, and the first coupling section, the second coupling section and the third coupling section are respectively coupled with the annular transmission antenna, so that the annular transmission antenna has three different working frequency bands. According to the utility model, three different working frequency bands are obtained on one multi-frequency antenna structure, and a high-gain effect is realized at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of communications, and in particular relates to a multi-frequency antenna structure and a mobile device. Background Art

[0002] With the development of technology, mobile devices have entered the 5G era. The transmission rate is higher than 4G, and high-speed information transmission requires more antennas. N77, N78 and N79 are the current mainstream 5G frequency bands, namely 3.3-5GHz. MIMO antennas are set in mobile devices to support the 5G frequency band. In order to achieve 5G high-speed information transmission, the MIMO antenna device has multiple antennas, which can increase the transmission speed by multiplexing data streams in space. Due to the large number of MIMO antennas, a large amount of space inside the mobile device is required. At the same time, in order to realize functions such as camera, sensing, GPS positioning, Bluetooth transmission, etc., the mobile device needs to be equipped with more corresponding devices. The increase in devices has squeezed the antenna space inside the mobile device, resulting in a reduction in the antenna clearance area and interference with the MIMO antenna, resulting in reduced antenna transmission efficiency. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and to provide a multi-frequency antenna structure, which couples a ring transmission antenna with a coupling antenna to obtain three different operating frequency bands on a multi-frequency antenna structure, while superimposing the field strength directions to achieve a high gain effect.

[0004] The utility model is realized by the following technical solutions:

[0005] A multi-frequency antenna structure comprises an antenna substrate, a ring transmission antenna, and a coupling antenna; the ring transmission antenna is arranged on the antenna substrate, and the ring transmission antenna comprises a feeding point, a first transmission radiator, a second transmission radiator, and a return point which are electrically connected in sequence to form a ring structure; the feeding point is electrically connected to the antenna substrate, and the return point is electrically connected to the antenna substrate; the coupling antenna is arranged on the antenna substrate, and the coupling antenna comprises a first coupling section, a second coupling section, and a third coupling section, and the first coupling section, the second coupling section, and the third coupling section are respectively coupled with the ring transmission antenna, so that the ring transmission antenna has three different working frequency bands.

[0006] The utility model provides a multi-frequency antenna structure. The annular transmission antenna has two different working frequency bands when not coupled. On the basis of the annular transmission antenna, a first coupling section, a second coupling section, and a third coupling section are arranged to couple with the annular transmission antenna by utilizing the coupling principle, so that three different working frequency bands are obtained on a multi-frequency antenna structure. When the multi-frequency antenna structure is installed in a mobile device, the number of antennas can be reduced, thereby reducing the space occupied by the antennas. Since the coupling antenna is coupled with the transmission antenna, the field strength directions are superimposed, so that a high gain effect can be achieved.

[0007] Furthermore, the annular structure is arranged in a rectangular shape, the first transmission radiator and the second transmission radiator both have a bent structure, and there is a gap between the ends of the first transmission radiator and the second transmission radiator; the first coupling section is coupled with the first transmission radiator, the second coupling section corresponds to the gap between the first transmission radiator and the second transmission radiator, and is coupled with the first transmission radiator and the second transmission radiator; the third coupling section is coupled with the second transmission radiator. This is a specific implementation method, a rectangular annular transmission antenna is arranged and a gap is provided between the first transmission radiator and the second transmission radiator, and the coupling antenna is coupled with the annular transmission antenna, and three different resonances in the range of 3.3GHz-5GHz are obtained through the synergistic effect of a specific shape setting, so that the same multi-frequency antenna structure can work in three different working frequency bands, realizing a broadband design.

[0008] Furthermore, the annular transmission antenna and the coupling antenna are both located on the same surface of the antenna substrate, the coupling antenna is arranged on the side of the annular transmission antenna away from the antenna substrate, and there is a gap between the coupling antenna and the annular transmission antenna; or the annular transmission antenna and the coupling antenna are both arranged on the antenna substrate, and the annular transmission antenna and the coupling antenna are located on the same plane. This is a specific implementation method, and the relative positions of the annular transmission antenna and the coupling antenna are adjusted to meet the requirements of the working frequency band and the installation space in the actual installation.

[0009] Furthermore, the first transmission radiator includes a first vertical segment and a first horizontal segment connected vertically, and the second transmission radiator includes a second vertical segment and a second horizontal segment connected vertically; the feeding point, the first vertical segment, the first horizontal segment, the second horizontal segment, the second vertical segment, and the grounding point are connected in sequence, and there is a gap between the first horizontal segment and the second horizontal segment; the first coupling segment is coupled with the first vertical segment; the second coupling segment is coupled with the first horizontal segment and the second horizontal segment, and the second coupling segment corresponds to the slit between the first horizontal segment and the second horizontal segment; the third coupling segment is coupled with the second vertical segment. This is a specific implementation method, and a multi-frequency antenna structure with three different operating frequency bands is obtained by adjusting the shape and coupling position.

[0010] Furthermore, the first coupling section, the second coupling section, and the third coupling section are fixedly connected in sequence. This is a specific implementation method, in which the coupling antenna is integrated and coupled with the ring transmission antenna to obtain a specific frequency working band.

[0011] Further, there is a gap between the first coupling section and the second coupling section, or the first coupling section and the second coupling section are fixedly connected. This is a specific implementation method, and the shapes of the first coupling section and the second coupling section are adjusted, thereby adjusting the coupling position to couple to obtain three different working frequency bands.

[0012] Further, there is a gap between the third coupling section and the second coupling section, or the third coupling section and the second coupling section are fixedly connected. The third coupling section is coupled with the second vertical section, and an opening is adjusted between the third coupling section and the second coupling section, or the third coupling section and the second coupling section are integrally arranged to obtain an operating frequency band within the range of 3.3 GHz-5 GHz.

[0013] Furthermore, the multi-frequency antenna structure further comprises a supporting bracket, the supporting bracket is mounted on the antenna substrate, the annular transmission antenna and the coupling antenna are respectively arranged on two opposite sides of the supporting bracket. The supporting bracket is used to place the annular transmission antenna and the coupling antenna, and a spacing exists between the coupling antenna and the annular transmission antenna.

[0014] The utility model also provides a mobile device, including a shell, a fixing plate, a mainboard, and the above-mentioned multi-frequency antenna structure; the fixing plate is installed in the shell; the mainboard is arranged on the fixing plate; the multi-frequency antenna structure is arranged on the fixing plate and is electrically connected to the mainboard.

[0015] The mobile device provided by the utility model uses a multi-frequency antenna structure. In the multi-frequency antenna structure, a ring transmission antenna and a coupling antenna are coupled to obtain three different frequency bands. Three working frequency bands are obtained on one multi-frequency antenna structure, which reduces the number of antennas required in the mobile device, thereby reducing the space occupied by the antenna in the mobile device and making the antenna layout options more diverse.

[0016] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the multi-frequency antenna structure of Example 1.

[0018] Figure 2 It is a circuit diagram of the multi-frequency antenna structure of Example 1.

[0019] Figure 3It is a schematic diagram of the coupling position of the multi-frequency antenna structure of Example 1.

[0020] Figure 4 It is a schematic diagram of the installation of the ring transmission antenna and the coupling antenna of Example 1.

[0021] Figure 5 It is a schematic diagram of another installation method of the ring transmission antenna and the coupling antenna of Example 1.

[0022] Figure 6 It is a schematic diagram of the third installation method of the ring transmission antenna and the coupling antenna in Example 1.

[0023] Figure 7 It is a circuit diagram of an existing single loop antenna.

[0024] Figure 8 It is a parameter diagram of the multi-frequency antenna structure S11 of Example 1.

[0025] Fig. 9 It is a curve diagram showing the variation of antenna efficiency with frequency in the multi-frequency antenna structure of Example 1. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the embodiments of the utility model in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the embodiments of the utility model, rather than to limit the embodiments of the utility model. It should also be noted that, for ease of description, only parts related to the embodiments of the utility model are shown in the accompanying drawings, rather than all structures.

[0027] In addition, the terms first, second, third, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0028] Similarly, the terms "fixed" and "connected" used in the specification and claims should not be construed as limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to a device or system in which device A is directly connected to device B, but means that there is a path between device A and device B, which may be a path including other devices or tools.

[0029] Example 1

[0030] The utility model provides a multi-frequency antenna structure. Figure 1 It is a schematic diagram of the structure of a multi-frequency antenna structure. Figure 1As shown, the multi-frequency antenna structure includes an antenna substrate 1, a ring transmission antenna 2, and a coupling antenna 3;

[0031] Figure 2 It is a circuit diagram of a multi-frequency antenna structure, such as Figure 1-2 As shown, the ring transmission antenna 2 is arranged on the antenna substrate 1, and the ring transmission antenna 2 includes a feeding point 21, a first transmission radiator 22, a second transmission radiator 23, and a return point 24 which are electrically connected in sequence to form a ring structure; the feeding point 21 is electrically connected to the antenna substrate 1, and the return point 24 is electrically connected to the antenna substrate 1;

[0032] The coupling antenna 3 is arranged on the antenna substrate 1, and the coupling antenna 3 includes a first coupling section 31, a second coupling section 32, and a third coupling section 33. The first coupling section 31, the second coupling section 32, and the third coupling section 33 are respectively coupled with the ring transmission antenna 2, so that the ring transmission antenna 2 has three different working frequency bands.

[0033] This embodiment 1 provides a multi-frequency antenna structure. On the basis of the ring transmission antenna 2, the first coupling section 31, the second coupling section 32, and the third coupling section 33 are arranged to couple with the ring transmission antenna 2 by utilizing the coupling principle, so that three different working frequency bands are obtained on a multi-frequency antenna structure. When the multi-frequency antenna structure is installed in a mobile device, the number of antennas can be reduced, thereby reducing the space occupied by the antennas. At the same time, since the coupling antenna 3 is coupled with the transmission antenna, the field strength directions are superimposed, a high gain effect can be achieved, and the transmission efficiency is improved.

[0034] Figure 3 It is a schematic diagram of the coupling position of the multi-frequency antenna structure, such as Figure 3 As shown, in a specific embodiment, the first coupling section 31 and the first coupling position 311 of the ring transmission antenna 2, the second coupling section 32 and the second coupling position 322 of the ring transmission antenna 2, and the third coupling section 33 and the third coupling position 333 of the ring transmission antenna 2 are distributed in sequence along the ring structure of the ring transmission antenna 2.

[0035] It can be understood that the coupling antenna 3 is arranged on the antenna substrate 1. The coupling antenna 3 can be directly arranged on the antenna substrate 1, and it and the ring transmission antenna 1 are located on the same surface of the antenna substrate 1, or the coupling antenna 3 and the ring transmission antenna 1 are located on two surfaces of the antenna substrate; in another embodiment, the coupling antenna 3 can be indirectly arranged on the antenna substrate 1 by setting a bracket or the like.

[0036] Preferably, Figure 4 This is a schematic diagram of the installation of the ring transmission antenna and the coupling antenna, such as Figure 4As shown, the ring structure is arranged in a rectangular shape, the first transmission radiator 22 and the second transmission radiator 23 both have a bent structure, and there is a gap between the ends of the first transmission radiator 22 and the second transmission radiator 23; the first coupling section 31 is coupled with the first transmission radiator 22, the second coupling section 32 corresponds to the gap between the first transmission radiator 22 and the second transmission radiator 23, and is coupled with the first transmission radiator 22 and the second transmission radiator 23; the third coupling section 33 is coupled with the second transmission radiator 23. This is a specific implementation method, a rectangular ring transmission antenna 2 is arranged, and a gap is provided between the first transmission radiator 22 and the second transmission radiator 23, and the coupling antenna 3 is coupled with the ring transmission antenna 2, and three different resonances in the range of 3.3 GHz-5 GHz are excited by the synergistic effect of the specific shape setting, so that the same multi-frequency antenna structure can work in three different working frequency bands, realizing a broadband design. The first coupling section 31, the second coupling section 32 and the third coupling section 33 are arranged to be coupled to different positions of the ring transmission antenna 2, so as to adjust the resonance position through coupling in the two working frequency bands of the ring transmission antenna 2 and obtain three working frequency bands. At the same time, the coupling antenna 3 and the ring transmission antenna 2 are positively superimposed at the coupling position to achieve high gain and improve working efficiency.

[0037] Preferably, Figure 4 As shown, the annular transmission antenna 2 and the coupling antenna 3 are both located on the same surface of the antenna substrate 1, and the coupling antenna 3 is arranged on the side of the annular transmission antenna 2 away from the antenna substrate 1, and there is a gap between the coupling antenna 3 and the annular transmission antenna 2; or, the annular transmission antenna 2 and the coupling antenna 3 are both arranged on the antenna substrate 1, and the annular transmission antenna 2 and the coupling antenna 3 are located on the same plane. This is a specific implementation method, and the relative position of the annular transmission antenna 2 and the coupling antenna 3 is adjusted to meet the requirements of the working frequency band and the installation space in the actual installation. In a specific implementation method, the relative position of the annular transmission antenna 2 and the coupling antenna 3 can be adjusted according to the requirements of the working frequency band and the installation space, and the first coupling position 311, the second coupling position 322, and the third coupling position 333 can be adjusted to the following: Figure 3 As shown, for example, Figure 1 and Figure 4 As shown, the coupling antenna 3 is arranged parallel to the ring transmission antenna 2, and the coupling antenna 3 and the ring transmission antenna can be arranged perpendicular to the antenna substrate 1; Figure 5 In the figure, the ring transmission antenna 2 and the coupling antenna 3 are located in the same plane, the first coupling section 31 and the second coupling section 32 can be arranged inside the ring transmission antenna 2, and the third coupling section 33 can be arranged outside the ring transmission antenna 2 to achieve the coupling effect. Figure 6It is a schematic diagram of the third installation method of the ring transmission antenna and the coupling antenna. The coupling antenna 3 is arranged parallel to the ring transmission antenna 2. The lengths of the second coupling section 32 and the third coupling section 33 are adjusted to adjust the working frequency band obtained by coupling.

[0038] Preferably, Figure 2-5 As shown, the first transmission radiator 22 includes a first vertical segment 221 and a first horizontal segment 222 that are vertically connected, and the second transmission radiator 23 includes a second vertical segment 231 and a second horizontal segment 232 that are vertically connected;

[0039] The feeding point 21, the first vertical segment 221, the first horizontal segment 222, the second horizontal segment 232, the second vertical segment 231, and the grounding point are connected in sequence, and there is a gap between the first horizontal segment 222 and the second horizontal segment 232;

[0040] The first coupling section 31 is coupled to the first vertical section 221; the second coupling section 32 is coupled to the first horizontal section 222 and the second horizontal section 232, and the second coupling section 32 corresponds to the slot between the first horizontal section 222 and the second horizontal section 232; the third coupling section 33 is coupled to the second vertical section 231. This is a specific implementation method, by adjusting the shape and coupling position, a multi-frequency antenna structure with three different working frequency bands is obtained. For example, as shown in FIG. 4, the projection of the second coupling section 32 covers the slot between the first horizontal section 222 and the second horizontal section 232; as shown in FIG. Figure 5 As shown, the loop transmission antenna 2 and the coupling antenna 3 are located in the same plane, the first and second coupling segments 32 are arranged in the loop transmission antenna 2, and the openings between the first horizontal segment 222 and the second horizontal segment 232 are arranged opposite to each other.

[0041] More preferably, the first coupling section 31, the second coupling section 32, and the third coupling section 33 are fixedly connected in sequence. This is a specific implementation method, in which the coupling antenna 3 is integrated and coupled with the ring transmission antenna 2 to obtain a specific frequency working band.

[0042] In another embodiment, there is a gap between the first coupling section 31 and the second coupling section 32, or the first coupling section 31 is fixedly connected to the second coupling section 32. The shapes of the first coupling section 31 and the second coupling section 32 are adjusted, thereby adjusting the coupling position to couple to obtain three different working frequency bands.

[0043] There is a gap between the third coupling section 33 and the second coupling section 32, or the third coupling section 33 is fixedly connected to the second coupling section 32. The third coupling section 33 is coupled to the second vertical section 231, and an opening is adjusted between the third coupling section 33 and the second coupling section 32, or the third coupling section 33 and the second coupling section 32 are integrally arranged to obtain an operating frequency band within the range of 3.3 GHz-5 GHz.

[0044] Figure 7 This is a circuit diagram of an existing single loop antenna. Figure 8 It is the S11 parameter diagram of the multi-frequency antenna structure, such as Figure 7 and Figure 8 As shown, the existing single loop antenna has two operating frequency bands of 3.3 GHz-5 GHz. In the multi-frequency antenna structure of the first embodiment, there is a gap between the first transmission radiator 22 and the second transmission radiator 23, the first coupling section 31 and the second coupling section 32 are fixedly connected to form an L-shaped arrangement, and there is a gap between the third coupling section 33 and the second coupling section 32, so as to obtain the following excitation: Figure 7 In the three working frequency bands shown, when the working wavelength is λ, the multi-frequency antenna structure increases the frequency band of 0.75λ between 0.5λ and 1λ through coupling, so that the multi-frequency antenna structure has three working frequency bands in 3.3GHz-5GHz, increasing the bandwidth.

[0045] In practical applications, the size of the multi-frequency antenna structure of the present embodiment 1 can reach 148mm*72mm*7mm. Three operating frequency bands can be obtained by using one multi-frequency antenna structure, which is beneficial to saving the number of antennas.

[0046] Figure 8 It is a curve diagram showing the change of antenna efficiency with frequency in a multi-frequency antenna structure. Figure 8 As shown, in the multi-frequency antenna structure of the first embodiment, the working efficiency at 3.3 GHz-5 GHz is -0.5 dB, -2.4 dB, and -0.25 dB. It can be understood that by changing the width of the slot between the loop transmission antenna 2 and the coupling antenna 3 or changing the length of the loop transmission antenna 2 and the coupling antenna 3, the resonance point can be shifted left and right and the bandwidth can be adjusted to obtain the most suitable working frequency band.

[0047] Preferably, the multi-frequency antenna structure further includes a support bracket, which is mounted on the antenna substrate, and the annular transmission antenna 2 and the coupling antenna 3 are respectively arranged on two opposite sides of the support bracket. When the annular transmission antenna 2 and the coupling antenna 3 are arranged in parallel, the support bracket is used to place the coupling antenna 3 so that there is a gap between the coupling antenna 3 and the annular transmission antenna 2 to achieve coupling. In a specific implementation, the height of the support bracket can be adjusted to adjust the width of the slit between the coupling antenna 3 and the annular transmission antenna 2 to achieve coupling and high gain. Specifically, the support bracket is a plastic part.

[0048] In one embodiment, the ring transmission antenna 2 is arranged on one side of the antenna substrate 1, the coupling antenna 3 and the ring transmission antenna 2 are located on the same side of the antenna substrate 1, and the coupling antenna 3 is arranged on the side of the ring transmission antenna 2 away from the antenna substrate 1 through a supporting bracket. By adjusting the thickness of the supporting bracket, the distance between the coupling antenna 3 and the ring transmission antenna 2 can be adjusted to change the resonance point, so that the coupling antenna 3 can be coupled with the ring transmission antenna 2 in a suitable frequency band.

[0049] In another embodiment, the supporting bracket is installed on the side surface of the antenna substrate 1, the annular transmission antenna 2 is arranged on the side of the supporting bracket close to the antenna substrate 1, the annular transmission antenna 2 is electrically connected to the antenna substrate 1 through the power terminal, and the coupling antenna 3 is arranged on the side of the supporting bracket away from the antenna substrate 1.

[0050] In another embodiment, the ring transmission antenna 2 and the coupling antenna 3 are respectively arranged on two sides of the antenna substrate 1. The coupling antenna 3 is fixed to the antenna substrate 1 through a supporting bracket and coupled with the ring transmission antenna 2. The distance between the coupling antenna 3 and the ring transmission antenna 2 can be adjusted by adjusting the height of the supporting bracket.

[0051] Example 2

[0052] This embodiment 2 provides a mobile device, including a housing, a fixing plate, a mainboard, and the multi-frequency antenna structure described in embodiment 1;

[0053] The fixing plate is installed in the shell; the main board is arranged on the fixing plate; the multi-frequency antenna structure is arranged on the fixing plate and is electrically connected to the main board.

[0054] The mobile device provided by the utility model uses a multi-frequency antenna structure. In the multi-frequency antenna structure, the ring transmission antenna and the coupling antenna 3 are coupled to obtain three different frequency bands. Three working frequency bands are obtained on one multi-frequency antenna structure, which reduces the number of antennas required in the mobile device, thereby reducing the space occupied by the antenna in the mobile device and making the antenna layout options more diverse.

[0055] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A multi-frequency antenna structure, characterized in that: It includes an antenna substrate, a ring transmission antenna, and a coupling antenna; The annular transmission antenna is arranged on the antenna substrate, and the annular transmission antenna comprises a feeding point, a first transmission radiator, a second transmission radiator, and a return point which are electrically connected in sequence to form an annular structure; the feeding point is electrically connected to the antenna substrate, and the return point is electrically connected to the antenna substrate; The coupling antenna is arranged on the antenna substrate, and the coupling antenna includes a first coupling section, a second coupling section, and a third coupling section. The first coupling section, the second coupling section, and the third coupling section are respectively coupled with the ring transmission antenna, so that the ring transmission antenna has three different working frequency bands.

2. The multi-frequency antenna structure according to claim 1, characterized in that: The annular transmission antenna is arranged in a rectangular shape, the first transmission radiator and the second transmission radiator both have a bent structure, and there is a gap between the ends of the first transmission radiator and the second transmission radiator; The first coupling section is coupled to the first transmission radiator, the second coupling section corresponds to the gap between the first transmission radiator and the second transmission radiator, and is coupled to the first transmission radiator and the second transmission radiator; the third coupling section is coupled to the second transmission radiator.

3. The multi-frequency antenna structure according to claim 2, characterized in that: The annular transmission antenna and the coupling antenna are both located on the same surface of the antenna substrate, the coupling antenna is arranged on a surface of the annular transmission antenna away from the antenna substrate, and there is a gap between the coupling antenna and the annular transmission antenna; Alternatively, the annular transmission antenna and the coupling antenna are both arranged on an antenna substrate, and the annular transmission antenna and the coupling antenna are located in the same plane.

4. The multi-frequency antenna structure according to claim 3, characterized in that: The first transmission radiator includes a first vertical segment and a first horizontal segment connected vertically, and the second transmission radiator includes a second vertical segment and a second horizontal segment connected vertically; The feeding point, the first vertical segment, the first horizontal segment, the second horizontal segment, the second vertical segment, and the grounding point are connected in sequence, and there is a gap between the first horizontal segment and the second horizontal segment; The first coupling segment is coupled to the first vertical segment; the second coupling segment is coupled to the first horizontal segment and the second horizontal segment, and the second coupling segment corresponds to the gap between the first horizontal segment and the second horizontal segment; the third coupling segment is coupled to the second vertical segment.

5. The multi-frequency antenna structure according to claim 4, characterized in that: The first coupling section, the second coupling section and the third coupling section are fixedly connected in sequence.

6. The multi-frequency antenna structure according to claim 4, characterized in that: There is a gap between the first coupling section and the second coupling section, or the first coupling section is fixedly connected to the second coupling section.

7. The multi-frequency antenna structure according to claim 5, characterized in that: There is a gap between the third coupling section and the second coupling section, or the third coupling section and the second coupling section are fixedly connected.

8. The multi-frequency antenna structure according to any one of claims 1 to 7, characterized in that: It also includes a supporting bracket; the supporting bracket is installed on the antenna substrate, and the annular transmission antenna and the coupling antenna are respectively arranged on two opposite sides of the supporting bracket.

9. A mobile device, characterized in that: It comprises a housing, a fixing plate, a main board, and the multi-frequency antenna structure according to any one of claims 1 to 8; The fixing plate is installed in the shell; the main board is arranged on the fixing plate; the multi-frequency antenna structure is arranged on the fixing plate and is electrically connected to the main board.

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