Antenna structure and electronic equipment

Abstract

The utility model relates to an antenna structure and electronic equipment, the antenna structure comprises a first antenna and a second antenna which are adjacently arranged, and an isolation part arranged between the first antenna and the second antenna, the isolation part is used for preventing first current conduction between the first antenna and the second antenna, the first current is generated based on a first radiation wave of the first antenna or the second antenna. According to the invention, the isolation part is arranged between the first antenna and the second antenna to prevent the conduction of the first current between the first antenna and the second antenna, so that the mutual interference between the first antenna and the second antenna during radiation is avoided, the antenna isolation is improved, the antenna performance is improved, and the radiation efficiency of the antenna is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an antenna installation structure and electronic equipment. Background Art

[0002] With the continuous development of technology, electronic devices are becoming more and more miniaturized and integrated. At present, in order to achieve rich signal functions, electronic devices often have a large number of antennas. However, the internal layout of electronic devices is compact, and there is less space reserved for antennas. Therefore, the distance between antennas is close, and the isolation between adjacent antennas is poor, causing the antennas to interfere with each other when working, reducing the performance and signal quality of the antennas, and the user experience is poor. Utility Model Content

[0003] In order to overcome the problems existing in the related art, the present disclosure provides an antenna structure and an electronic device.

[0004] According to a first aspect of the present disclosure, an antenna structure is provided, comprising a first antenna and a second antenna arranged adjacent to each other, and an isolation portion arranged between the first antenna and the second antenna, the isolation portion being used to prevent a first current from being conducted between the first antenna and the second antenna, wherein the first current is generated based on a first radiation wave of the first antenna or the second antenna.

[0005] In a possible implementation manner, the isolation portion is electrically connected to a ground point to conduct the first current to the ground point for output.

[0006] In a possible implementation, the isolation portion includes a conductive portion and a first tuning circuit electrically connected to the conductive portion, one end of the first tuning circuit is electrically connected to the conductive portion, and the other end of the first tuning circuit is electrically connected to the ground point.

[0007] In a possible implementation manner, the first tuning circuit includes a selection switch and a plurality of tuning branches arranged in parallel, and the conductive portion can be connected to different tuning branches through the selection switch.

[0008] In a possible implementation manner, the tuning branch includes an inductor branch provided with an inductor device and a capacitor branch provided with a capacitor device, and each of the tuning branches is provided with a connection port for being electrically connected to the selection switch.

[0009] In a possible implementation manner, the plurality of tuning branches include three inductance branches and one capacitance branch, and the inductance value of the inductor arranged on each of the inductance branches is different.

[0010] In a possible implementation, the antenna structure further includes a circuit board, the first tuning circuit is disposed on the circuit board, and the circuit board is electrically connected to the ground point.

[0011] In a possible implementation manner, the isolation portion is configured as an isolation antenna, and the isolation antenna is used to radiate a second radiation wave outwardly, and the second radiation wave generates a second current, and the second current and the first current cancel each other out.

[0012] In a possible implementation manner, the isolation antenna includes an antenna body and a second tuning circuit, and the second tuning circuit is electrically connected to a feed point and the antenna body, respectively.

[0013] In a possible implementation, the first antenna and / or the second antenna is a cavity antenna.

[0014] In a possible implementation, the first antenna has a first opening, the second antenna has a second opening, and a first distance between the isolation portion and the first opening and a second distance between the isolation portion and the second opening are both greater than 5 mm.

[0015] In a possible implementation manner, the length of the isolation portion is inversely proportional to the frequency of the first radiation wave.

[0016] In a possible implementation manner, the isolation portion is disposed at a first position between the first antenna and the second antenna, wherein the first position is a position where a current value of the first current is maximum.

[0017] According to a second aspect of the present disclosure, an electronic device is provided, comprising the antenna structure as described in the first aspect of the present disclosure.

[0018] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure sets an isolation portion between the first antenna and the second antenna to prevent the first current between the first antenna and the second antenna from being conducted, thereby avoiding mutual interference between the two when the first antenna or the second antenna is radiating, which is beneficial to improving antenna isolation, thereby improving antenna performance, and improving the radiation efficiency of the antenna.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] Figure 1is a schematic diagram of an antenna structure according to an exemplary embodiment.

[0022] Figure 2 is a schematic diagram of an isolation portion according to an exemplary embodiment.

[0023] Figure 3 This is a diagram of the current intensity distribution when the isolation part is not connected to the ground point.

[0024] Figure 4 This is a diagram of the current intensity distribution when the isolation part is connected to the ground point.

[0025] Figure 5 It is a curve diagram of antenna frequency and isolation in the related technology.

[0026] Figure 6 It is a curve diagram of antenna frequency and isolation in the present disclosure.

[0027] Figure 7 3 is a comparison chart of the isolation between the antenna structure in the related art and the antenna structure in the present disclosure. DETAILED DESCRIPTION

[0028] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0029] With the continuous development of technology, electronic devices are becoming more and more miniaturized and integrated. At present, in order to achieve rich signal functions, electronic devices often have a large number of antennas. However, the internal layout of electronic devices is compact, and there is less space reserved for antennas. Therefore, the isolation between adjacent antennas is poor, causing the antennas to interfere with each other when working, reducing the performance and signal quality of the antennas, and the user experience is poor.

[0030] The degree of interference between antennas is expressed by isolation, which is the ratio of the power of the signal leaking to other ports to the input power, measured in dB. The smaller the isolation, the lower the interference between antennas and the better the antenna performance. In order to ensure that the antenna has good signal strength and radiation range, the isolation of the antenna usually needs to reach a set isolation value according to the design requirements of the electronic equipment. In one example, the isolation can be around -35dB. In related technologies, due to the close distance between adjacent antennas, the isolation of adjacent antennas is usually difficult to reach -35dB, and the antenna performance and signal quality are poor.

[0031] In order to solve the above technical problems, the present disclosure provides an antenna structure and an electronic device, wherein the antenna structure includes a first antenna and a second antenna arranged adjacent to each other, and an isolating portion arranged between the first antenna and the second antenna, the isolating portion being used to prevent a first current from being conducted between the first antenna and the second antenna, wherein the first current is generated based on a first radiation wave of the first antenna or the second antenna. The present disclosure prevents the first current from being conducted between the first antenna and the second antenna by setting an isolating portion between the first antenna and the second antenna, thereby avoiding mutual interference between the first antenna and the second antenna that affects the normal operation of the antenna, which is beneficial to improving antenna isolation, thereby improving antenna performance, and improving the radiation efficiency of the antenna, thereby enhancing the signal usage experience of the user.

[0032] According to an exemplary embodiment, Figure 1-Figure 2 As shown, an embodiment of the present disclosure provides an antenna structure, the antenna structure includes a first antenna 11 and a second antenna 12, the first antenna 11 and the second antenna 12 are arranged adjacent to each other, and the first antenna 11 and the second antenna 12 can be arranged in the middle frame of the electronic device, and can be arranged near the top or bottom or side of the middle frame. Among them, the first antenna 11 and the second antenna 12 can be antennas with the same frequency and ground, that is, the working frequency bands of the first antenna 11 and the second antenna 12 are the same or similar, and the first antenna 11 and the second antenna 12 share the same grounding point. In one example, one of the first antenna 11 and the second antenna 12 can be used to implement a WiFi function, and the other of the first antenna 11 and the second antenna 12 can be used to implement a Bluetooth function.

[0033] Of course, it is understandable that the operating frequency bands of the first antenna 11 and the second antenna 12 may be different, and they may not share the same grounding point. As long as mutual interference occurs between the first antenna 11 and the second antenna 12, resulting in poor isolation between the first antenna 11 and the second antenna 12, the technical solution of the embodiment of the present disclosure can be used to improve the isolation effect between the antennas and improve antenna performance.

[0034] The antenna structure also includes an isolation portion 20 disposed between the first antenna 11 and the second antenna 12. The isolation portion 20 is used to prevent the first current from being conducted between the first antenna 11 and the second antenna 12. The first current is generated based on the first radiation wave of the first antenna 11 or the second antenna 12. Since the first current is generated based on the first radiation wave of one of the first antenna 11 and the second antenna 12, and since there is a conversion relationship between the electric field and the magnetic field, when the other of the first antenna 11 and the second antenna 12 receives the first radiation wave, a current will be generated inside it, thereby causing signal interference to the antenna and affecting the antenna performance. By setting the isolation portion 20 to prevent the first current from being conducted, signal interference between the first antenna 11 and the second antenna 12 can be avoided, the isolation effect of the antenna can be improved, and the antenna performance can be improved. Among them, since the isolation portion 20 is disposed between the first antenna 11 and the second antenna 12, the first radiation wave must pass through the isolation portion 20. When the isolation portion 20 receives the first radiation wave, the isolation effect can be achieved by grounding the first current generated by the first radiation wave to be derived, or the isolation portion 20 itself can radiate the second radiation wave outward, thereby offsetting the first radiation wave to achieve the isolation effect.

[0035] Among them, the isolation part 20 can be used to conduct the first current to other components or to the ground, and can also be used to generate a current that offsets the first current, thereby eliminating the influence of the first current. The first current can also be blocked and absorbed by setting capacitors, inductors and other devices. The embodiment of the present disclosure does not impose too many restrictions on the specific manner in which the isolation part 20 prevents the first current from being conducted between the first antenna 11 and the second antenna 12, as long as the first current can be prevented from flowing into the antenna and affecting the antenna performance.

[0036] In the embodiment of the present disclosure, an isolation portion is provided between the first antenna and the second antenna to prevent the first current from being conducted between the first antenna and the second antenna, thereby avoiding mutual interference between the first antenna and the second antenna that affects the normal operation of the antenna, which is beneficial to improving antenna isolation, thereby improving antenna performance, and improving the radiation efficiency of the antenna, thereby enhancing the user's signal usage experience.

[0037] In some embodiments, in order to improve the isolation effect of the isolation part 20, the isolation part 20 can be set at a first position between the first antenna 11 and the second antenna 12. The first position is the position where the current value of the first current is the largest. The first position can be obtained through actual testing or simulation.

[0038] In some embodiments, the isolation portion 20 is electrically connected to the ground point 30 to conduct the first current to the ground point 30 for output. Figure 2As shown, the isolation part 20 includes a conductive part 21 and a first tuning circuit 22 electrically connected to the conductive part 21. The conductive part 21 can be, for example, a metal spring or a flexible circuit board. The material of the metal spring can be, for example, copper, aluminum, or other materials with good conductivity. One end of the first tuning circuit 22 is electrically connected to the conductive part 21, and the other end of the first tuning circuit 22 is electrically connected to the grounding point 30. The first current is conducted to the first tuning circuit 22 through the conductive part 21, and is grounded through the first tuning circuit 22, thereby avoiding the first current from having an adverse effect on the performance of the antenna. Among them, the circuit structure of the first tuning circuit 22 can be set according to the isolation requirements between the first antenna 11 and the second antenna 12. At the same time, multiple branches can be set on the first tuning circuit 22, and different branches can correspond to different isolations. When applied to different electronic devices, different branches can be selected according to different needs, so that there is no need to repeat design and development.

[0039] like Figure 3-Figure 4 As shown, Figure 3 is a current intensity distribution diagram when the isolation portion 20 is not connected to the grounding point 30, Figure 4 is a current intensity distribution diagram when the isolation part 20 is connected to the grounding point 30. The lighter the shade in the figure, the greater the current at that position. Figure 3 and Figure 4 It can be seen that the first antenna 11 radiates signals outward as a radiating antenna. When the isolation part 20 is not grounded, a large amount of current is distributed at the first antenna 11, and a small amount of current is distributed at the isolation part 20 and the second antenna 12, indicating that the second antenna 12 will be affected by the first antenna 11; when the isolation part 20 is grounded, a large amount of current is distributed at the first antenna 11 and the isolation part 20, and there is almost no current distribution at the second antenna 12, proving that grounding the isolation part 20 can better avoid the first current causing the antenna isolation to deteriorate, thereby improving the antenna performance and signal quality.

[0040] In some embodiments, the first tuning circuit 22 includes a selection switch 23 and multiple tuning branches arranged in parallel. The conductive portion 21 can be connected to different tuning branches through the selection switch 23, thereby achieving the effect of improving the isolation between antennas of different specifications and different frequency bands.

[0041] In some embodiments, the tuning branch includes an inductive branch provided with an inductive device and a capacitive branch provided with a capacitive device. Each tuning branch is provided with a connection port for electrically connecting to the selection switch 23. By connecting the selection switch 23 to different connection ports, switching of different tuning branches can be achieved, so that the first tuning circuit 22 can adapt to the needs of different antennas.

[0042] In one example, if Figure 2As shown, the multiple tuning branches include three inductance branches and one capacitance branch, and the inductance value of the inductor arranged on each inductance branch is different.

[0043] The multiple tuning branches include a first inductor branch 241 , a second inductor branch 242 , a third inductor branch 243 and a capacitor branch 244 . The first inductor branch 241 , the second inductor branch 242 , the third inductor branch 243 and the capacitor branch 244 are arranged in parallel. The first inductor branch 241 is provided with a first inductor 251, one end of which is electrically connected to the first connection port 261, and the other end of the first inductor 251 is grounded; the second inductor branch 242 is provided with a second inductor 252, one end of which is electrically connected to the second connection port 262, and the other end of the second inductor 252 is grounded; the third inductor branch 243 is provided with a third inductor 253, one end of which is electrically connected to the third connection port 263, and the other end of the third inductor 253 is grounded; the capacitor branch is provided with a first capacitor 254, one end of which is electrically connected to the fourth connection port 264, and the other end of the first capacitor 254 is grounded.

[0044] Among them, the inductance values ​​of the first inductor 251, the second inductor 252 and the third inductor 253 are different. In one example, the inductance value of the first inductor 251 is 4.7nH, the inductance value of the second inductor 252 is 2nH, the inductance value of the third inductor 253 is 0.6nH, and the capacitance value of the first capacitor 254 is 1.5pF. Preferably, the inductance values ​​of the first inductor 251, the second inductor 252 and the third inductor 253 are kept at the same order of magnitude to facilitate the calculation and control of the circuit. Of course, it can be understood that the actual inductance values ​​of the first inductor 251, the second inductor 252 and the third inductor 253 can be set by those skilled in the art according to the isolation requirements of the electronic device, and the embodiments of the present disclosure do not impose too many restrictions on this.

[0045] In some embodiments, the antenna structure further includes a circuit board, the first tuning circuit 22 is arranged on the circuit board, the circuit board is electrically connected to the grounding point 30, and the middle frame 40 is a metal middle frame, so that when the user holds it, the current is transferred to the user's body through the middle frame 40, thereby achieving grounding. In one example, the first tuning circuit 22 is arranged on the first circuit board of the electronic device, and the first tuning circuit 22 is grounded through the grounding point 30 on the first circuit board, wherein the first circuit board can be a flexible circuit board, the second circuit board can be a PCB board (Printed Circuit Board, printed circuit board), and the second circuit board is the main board of the microelectronic device. In another example, the first circuit board is a flexible circuit board, the first tuning circuit 22 is arranged on the second circuit board, the second circuit board is electrically connected to the first circuit board of the electronic device, and the second circuit board is grounded.

[0046] In some embodiments, the isolation portion is configured as an isolation antenna (not shown in the figure). The isolation antenna may be an FPC (Flexible Printed Circuit) antenna, which is used to radiate a second radiation wave outward, and the second radiation wave generates a second current, and the second current and the first current cancel each other out, thereby eliminating the interference caused by the first current to the antenna and improving the radiation efficiency of the antenna. The first current is generated based on the first radiation wave of the first antenna 11 or the second antenna 12, and the second current may be the same in magnitude and opposite in direction to the first current.

[0047] In one example, the isolation antenna includes an antenna body and a second tuning circuit, and the second tuning circuit is electrically connected to the feed point and the antenna body, respectively. The second tuning circuit may include multiple branches, each branch is provided with a different capacitor or inductor, and when the antenna body is connected to different branches, different second radiation waves can be radiated, and a second current is generated to offset the interference caused by the first current to the antenna. By switching to different branches by selecting a switch, the second tuning circuit can adapt to the needs of different antennas.

[0048] In some embodiments, the first antenna 11 and / or the second antenna 12 are cavity antennas. Among them, the cavity antenna refers to an antenna that radiates electromagnetic waves through a resonant cavity. Exemplarily, the shape of the cavity can be set as a box body, one of the four sides of the box body is set as an opening, and the other three sides are closed. In one example, the first antenna 11 is a cavity antenna, and the second antenna 12 is a circuit board antenna or a slot antenna or other antennas. In another example, the second antenna 12 is a cavity antenna, and the first antenna 11 is a circuit board antenna or a slot antenna or other antennas. In one example, both the first antenna 11 and the second antenna 12 are cavity antennas. It can be understood that the shapes of the first antenna 11 and the second antenna 12 can be selected by those skilled in the art according to actual needs, and the parameters such as the shape and opening size of the cavity antenna can also be adjusted as needed, and the embodiments of the present disclosure do not impose too many restrictions on this.

[0049] In one example, the first antenna 11 and the second antenna 12 are both cavity antennas. The first antenna 11 has a first opening, the second antenna 12 has a second opening, the distance between the isolation portion 20 and the first opening is a first distance, and the distance between the isolation portion 20 and the second opening is a second distance. To ensure that the isolation portion 20 has a good isolation effect on the first antenna 11 and the second antenna 12, the first distance and the second distance are both greater than 5 mm.

[0050] In some embodiments, the length of the isolation portion 20 is inversely proportional to the frequency of the first radiation wave. That is, the higher the frequency of the first radiation wave to be shielded, the shorter the length of the conductive portion 21 of the isolation portion 20. In one example, when the first antenna 11 is an antenna for realizing a WiFi function, the second antenna 12 is an antenna for realizing a Bluetooth function, and the isolation portion 20 is used to shield interference between Bluetooth signals and WiFi signals, the length of the conductive portion 21 of the isolation portion 20 is set to 12 mm.

[0051] According to an exemplary embodiment, Figure 1-Figure 2 As shown, an embodiment of the present disclosure provides an electronic device, which may be, for example, a mobile terminal, a tablet computer, a laptop computer, a smart watch, a smart bracelet, or other electronic device having an antenna and a signal transceiving function, and the electronic device includes the antenna structure as described in the above embodiment. The antenna structure includes a first antenna 11 and a second antenna 12 arranged adjacent to each other, and the first antenna 11 and the second antenna 12 may be arranged on a middle frame 40 of the electronic device. The antenna structure also includes an isolation portion 20, and the isolation portion 20 is arranged between the first antenna 11 and the second antenna 12. The isolation portion 20 is used to prevent the first current between the first antenna 11 and the second antenna 12 from being conducted, thereby eliminating the interference caused by the first current to the antenna and improving the radiation efficiency of the antenna. The first current is generated based on the first radiation wave of the first antenna 11 or the second antenna 12.

[0052] In the embodiment of the present disclosure, an isolation portion is provided between the first antenna and the second antenna of the electronic device to prevent the first current from being conducted between the first antenna and the second antenna, thereby avoiding mutual interference between the first antenna and the second antenna that affects the normal operation of the antenna, which is beneficial to improving the antenna performance of the electronic device, improving the radiation efficiency of the antenna, and thus enhancing the user's signal usage experience.

[0053] The following will be combined Figure 1-Figure 7 , which describes in detail and intuitively the specific beneficial effects achieved by the technical solution of the embodiment of the present disclosure.

[0054] like Figure 5 As shown, Figure 5It is a curve diagram of antenna frequency and isolation in the related art. Among them, the horizontal axis is frequency, the unit is GHz, the vertical axis is gain, the unit is dB, curve a represents the frequency of the first antenna 11 in the related art, curve b represents the frequency of the second antenna 12 in the related art, one of the first antenna 11 and the second antenna 12 is a WiFi antenna, and the other is a Bluetooth antenna. Curve c represents the isolation between the first antenna 11 and the second antenna 12 at the corresponding frequency in the related art. Among them, the coordinates of point A are (2.4, -26.4), and the coordinates of point B are (2.5, -26.1), that is, in the 2.4GHz~2.5GHz frequency band commonly used by WiFi antennas and Bluetooth antennas, the antenna isolation is about -26dB, which cannot meet the requirement of -35dB.

[0055] like Figure 6 As shown, Figure 6 The figure is a curve diagram of antenna frequency and isolation in the present disclosure. The horizontal axis is frequency in GHz, the vertical axis is gain in dB, curve d represents the frequency of the first antenna 11 in the present disclosure, curve e represents the frequency of the second antenna 12 in the present disclosure, one of the first antenna 11 and the second antenna 12 is a WiFi antenna, and the other is a Bluetooth antenna. Curve f represents the isolation between the first antenna 11 and the second antenna 12 at the corresponding frequency in the related art, and curve g represents the isolation between the first antenna 11 and the second antenna 12 at the corresponding frequency in the present disclosure. The coordinates of point C of curve f are (2.5, -22.0), and the coordinates of point D of curve g are (2.4, -35.0). By comparing point C and point D, it can be concluded that the antenna isolation in the 2.4GHz to 2.5GHz frequency band in the related art is -22dB, and after adopting the technical solution of the present disclosure, the antenna isolation can reach -35dB, which meets the design requirement of -35dB isolation, greatly improves the isolation effect between antennas, and improves antenna performance.

[0056] like Figure 7 As shown, Figure 7The figure is a comparison chart of the isolation between the antenna structure in the related art and the antenna structure in the present disclosure. The horizontal axis is the frequency in GHz, the vertical axis is the gain in dB, the curve j represents the frequency of the first antenna 11 in the related art, the curve k represents the frequency of the first antenna 11 in the present disclosure, the curve m represents the frequency of the second antenna 12 in the related art, the curve n represents the frequency of the second antenna 12 in the present disclosure, the curve p represents the isolation between the first antenna 11 and the second antenna 12 at the corresponding frequency in the related art, and the curve q and curve g represent the isolation between the first antenna 11 and the second antenna 12 at the corresponding frequency in the present disclosure. The coordinates of point M are (2.4, -40), and the coordinates of point N are (2.5, -36), indicating that in the 2.4GHz to 2.5GHz frequency band, the antenna isolation after adopting the technical solution of the present disclosure is better than the antenna isolation in the related art, and can reach -36dB to -40dB. The coordinates of point P are (5.1, -30), and the coordinates of point Q are (5.9, -37), indicating that in the 5.1GHz to 5.9GHz frequency band, the technical solution of the present disclosure can also improve the antenna isolation, and the antenna isolation can also be maintained at -30dB to -37dB. That is, after adopting the technical solution of the present disclosure, good antenna isolation is achieved in the commonly used 2.4GHz to 2.5GHz frequency band and 5.1GHz to 5.9GHz, thereby ensuring the performance of the antenna.

[0057] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the embodiments disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0058] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An antenna structure, characterized in that: It includes a first antenna and a second antenna arranged adjacent to each other, and an isolation portion arranged between the first antenna and the second antenna, wherein the isolation portion is used to prevent a first current from being conducted between the first antenna and the second antenna, wherein the first current is generated based on a first radiation wave of the first antenna or the second antenna.

2. The antenna structure according to claim 1, characterized in that: The isolation portion is electrically connected to a ground point to conduct the first current to the ground point for output.

3. The antenna structure according to claim 2, characterized in that: The isolation portion includes a conductive portion and a first tuning circuit electrically connected to the conductive portion, one end of the first tuning circuit is electrically connected to the conductive portion, and the other end of the first tuning circuit is electrically connected to the ground point.

4. The antenna structure according to claim 3, characterized in that: The first tuning circuit includes a selection switch and a plurality of tuning branches arranged in parallel, and the conductive portion can be connected to different tuning branches through the selection switch.

5. The antenna structure according to claim 4, characterized in that: The tuning branch includes an inductance branch provided with an inductance device and a capacitance branch provided with a capacitance device, and each of the tuning branches is provided with a connection port for being electrically connected to the selection switch.

6. The antenna structure according to claim 5, characterized in that: The plurality of tuning branches include three inductance branches and one capacitance branch, and the inductance value of the inductance device arranged on each of the inductance branches is different.

7. The antenna structure according to any one of claims 3 to 6, characterized in that: The antenna structure further includes a circuit board, the first tuning circuit is arranged on the circuit board, and the circuit board is electrically connected to the ground point.

8. The antenna structure according to claim 1, characterized in that: The isolation portion is configured as an isolation antenna, and the isolation antenna is used to radiate a second radiation wave outwardly, and the second radiation wave generates a second current, and the second current and the first current cancel each other out.

9. The antenna structure according to claim 8, characterized in that: The isolation antenna includes an antenna body and a second tuning circuit, and the second tuning circuit is electrically connected to a feed point and the antenna body respectively.

10. The antenna structure according to any one of claims 1 to 6, 8 or 9, characterized in that: The first antenna and / or the second antenna is a cavity antenna.

11. The antenna structure according to claim 10, characterized in that: The first antenna has a first opening, the second antenna has a second opening, and a first distance between the isolation portion and the first opening and a second distance between the isolation portion and the second opening are both greater than 5 mm.

12. The antenna structure according to any one of claims 1 to 6, 8 or 9, characterized in that: The length of the isolation portion is inversely proportional to the frequency of the first radiation wave.

13. The antenna structure according to any one of claims 1 to 6, 8 or 9, characterized in that: The isolation portion is disposed at a first position between the first antenna and the second antenna, wherein the first position is a position where a current value of the first current is maximum.

14. An electronic device, characterized in that: Comprising the antenna structure as claimed in any one of claims 1 to 13.

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