Antenna structure, antenna tuning methods and electronic equipment

Abstract

This application discloses an antenna structure, an antenna tuning method, and an electronic device, belonging to the field of communication technology. The antenna structure includes a main radiator and a parasitic radiator; the parasitic radiator includes a first end and a second end, with the second end suspended; the main radiator includes a third end and a fourth end, with a gap between the third end and the first end, and the fourth end grounded; a first portion of the parasitic radiator is grounded, located between the first end and the second end; wherein, the first parasitic resonant frequency of the first portion is higher than the main resonant frequency, and the second parasitic resonant frequency of the second portion is lower than the main resonant frequency; the main resonant frequency is the resonant frequency of the main radiator; the first portion is the part of the parasitic radiator located between the first end and the first portion; the second portion is the part of the parasitic radiator located between the first portion and the second end.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to an antenna structure, an antenna tuning method, and an electronic device. Background Technology

[0002] In related technologies, parasitic branches can be used to improve antenna aperture efficiency.

[0003] However, the resonant frequency on the parasitic branch (i.e., parasitic resonance) can only satisfy one of the resonant frequencies above the main branch (i.e., main resonance) and below the main branch.

[0004] When the parasitic resonance is higher than the main resonance, on the one hand, the closer the parasitic resonance is to the main resonance, the better the impedance characteristics become, making it easier to achieve impedance matching and effectively reducing matching loss. However, the aperture efficiency will decrease at this time. On the other hand, when the parasitic resonance is higher than the main resonance, the impedance characteristics will be relatively worse, the matching loss will increase, but the antenna aperture efficiency will improve.

[0005] When the parasitic resonance is lower than the main resonance, on the one hand, the closer the parasitic resonance is to the main resonance, the better the impedance characteristics, and the easier it is to achieve impedance matching, which can effectively reduce matching loss, but the aperture efficiency will decrease at this time; on the other hand, when the parasitic resonance is lower than the main resonance, the impedance characteristics will be worse, the matching loss will increase, but the antenna aperture efficiency will improve.

[0006] Therefore, it can be seen that whether the parasitic resonance is higher than the main resonance or lower than the main resonance, there is a contradiction between the antenna aperture efficiency and impedance characteristics. Summary of the Invention

[0007] The purpose of this application is to provide an antenna structure, antenna tuning method, and electronic device that can simultaneously generate a first resonant frequency higher than the main resonance and a second resonant frequency lower than the main resonance on parasitic stubs, so as to simultaneously improve antenna aperture efficiency and impedance characteristics.

[0008] In a first aspect, embodiments of this application provide an antenna structure, which includes: a main radiator and a parasitic radiator;

[0009] The parasitic radiator includes a first end and a second end, with the second end suspended in the air;

[0010] The main radiator includes a third end and a fourth end, the third end having a gap between it and the first end, and the fourth end being grounded;

[0011] The first part of the parasitic radiator is grounded, and the first part is located between the first end and the second end;

[0012] Wherein, the first parasitic resonant frequency of the first part is higher than the main resonant frequency, and the second parasitic resonant frequency of the second part is lower than the main resonant frequency; the main resonant frequency is the resonant frequency of the main radiator; the first part is the portion of the parasitic radiator located between the first end and the first part; the second part is the portion of the parasitic radiator located between the first part and the second end.

[0013] Secondly, embodiments of this application provide an antenna tuning method applied to the antenna structure described in the first aspect, the method comprising:

[0014] Obtain the main resonant frequency of the main radiator;

[0015] The parasitic radiator is tuned according to the main resonant frequency so that the first parasitic resonant frequency of the first part of the parasitic radiator is higher than the main resonant frequency, and the second parasitic resonant frequency of the second part of the parasitic radiator is lower than the main resonant frequency.

[0016] Thirdly, embodiments of this application provide an electronic device that includes the antenna structure described in the first aspect.

[0017] In this embodiment, by grounding the first portion located between the first and second ends of the parasitic radiator, the parasitic radiator is divided into two parts. The first part is the portion of the parasitic radiator located between the first end and the first portion, and the second part is the portion of the parasitic radiator located between the first portion and the second end. The parasitic resonant frequency of the first part can be higher than the main resonant frequency of the main radiator, and the parasitic resonant frequency of the second part can be lower than the main resonant frequency of the main radiator. This achieves the following technical effects: improving the aperture efficiency in the high-frequency band of the main resonator; improving the aperture efficiency in the low-frequency band of the main resonator; reducing the matching loss in the high-frequency band of the main resonator; and reducing the matching loss in the low-frequency band of the main resonator. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an antenna structure using parasitic coupling in related technologies;

[0019] Figure 2 yes Figure 1 A schematic diagram of the main resonant frequency and parasitic resonant frequency of the antenna structure shown.

[0020] Figure 3 This is a schematic diagram of an antenna structure using a mouth-to-ground parasitic design in related technologies;

[0021] Figure 4 yes Figure 3 A schematic diagram of the main resonant frequency and parasitic resonant frequency of the antenna structure shown.

[0022] Figure 5 This is one of the schematic diagrams of the antenna structure provided in the embodiments of this application;

[0023] Figure 6 yes Figure 5 A schematic diagram of the main resonant frequency and parasitic resonant frequency of the antenna structure shown.

[0024] Figure 7 This is a second schematic diagram of the antenna structure provided in the embodiments of this application;

[0025] Figure 8 This is a flowchart of an antenna tuning method provided in an embodiment of this application. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0027] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, "A or B" covers three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] To facilitate understanding of the solutions in the embodiments of this application, the following terms or concepts will be explained first:

[0029] 1. Parasitism, such as... Figure 1 As shown, the antenna structure employing the paired parasitic configuration is as follows: a gap 103 is provided between the parasitic branch 102 and the main branch 101, and the end of the parasitic branch 102 furthest from the gap 103 is grounded to form the paired parasitic structure. The feed 104 on the main branch 101 is positioned close to the gap 103. Figure 2As shown, in an antenna structure employing parasitic symmetry, the resonant frequency of the parasitic branch 102 is typically higher than that of the main branch 101. In applications, it is necessary to adjust the length of the parasitic branch 102 or use a switch-load method to ensure that the resonant frequency of the parasitic branch 102 is higher than that of the main branch 101. If the parasitic resonance enters the frequency band of the main resonance, an efficiency dip will occur.

[0030] Specifically, such as Figure 2 As shown, when using a parasitic antenna structure, the parasitic resonance needs to be placed higher than the main resonance to improve the antenna aperture efficiency. With the parasitic resonance higher than the main resonance, the closer it is to the main resonance, the more it improves the antenna aperture efficiency of the main resonance, and also further improves the impedance characteristics at the end of the main resonance (i.e., the high-frequency band of the main resonance). When the parasitic resonance enters the main resonance, the impedance of the main resonance is improved, but an efficiency dip is generated.

[0031] 2. Mouth-to-ground parasitism, such as Figure 3 As shown, the antenna structure employing the port-to-ground parasitic configuration is as follows: a gap 103 is provided between the parasitic branch 102 and the main branch 101, and the end of the parasitic branch 102 closest to the gap 103 is grounded to form a port-to-ground parasitic structure. Figure 4 As shown, in an antenna structure employing a port-to-ground parasitic design, the resonant frequency of the parasitic branch 102 is typically lower than the resonant frequency of the main branch 101. In applications, it is necessary to adjust the length of the parasitic branch 102 or use a switch-load method to ensure that the resonant frequency of the parasitic branch 102 is lower than the resonant frequency of the main branch 101. If the parasitic resonance enters the frequency band of the main resonance, an efficiency dip will occur.

[0032] Specifically, such as Figure 4 As shown, when using a parasitic antenna structure, the parasitic resonance needs to be placed below the main resonance to improve aperture efficiency. When the parasitic resonance is below the main resonance, the closer the parasitic resonance is to the main resonance, the more it improves the aperture efficiency of the main resonance, and it also further improves the impedance characteristics at the beginning frequency of the main resonance (i.e., the low-frequency band of the main resonance). When the parasitic resonance enters the main resonance, the impedance of the main resonance is improved, but an efficiency dip is generated.

[0033] 3. Parasitic branches, also known as parasitic radiators.

[0034] 4. The main branch, which can also be called the main radiator.

[0035] 5. Parasitic resonance, which refers to the resonant frequency of a parasitic branch or parasitic radiator.

[0036] 6. Main resonance, which refers to the resonant frequency of the main branch or main radiator.

[0037] 7. The main resonance high-frequency band refers to the parasitic resonance band in the antenna structure's operating frequency that is higher than the main resonance, i.e., the first parasitic resonance frequency.

[0038] 8. The low-frequency band of the main resonance refers to the frequency band of parasitic resonance that is lower than the main resonance in the operating frequency of the antenna structure, i.e., the second parasitic resonance frequency.

[0039] It should be noted that in related technologies, the parasitic branch structure is either port-to-port parasitism or port-to-ground parasitism. When port-to-port parasitism is used, the parasitic resonance is higher than the main resonance. On the one hand, the closer the parasitic resonance is to the main resonance, the better the impedance characteristics, making impedance matching easier and effectively reducing matching losses, but the aperture efficiency decreases. On the other hand, when the parasitic resonance is higher than the main resonance, the impedance characteristics are relatively worse, and matching losses increase, but the antenna aperture efficiency improves. When port-to-ground parasitism is used, the parasitic resonance is lower than the main resonance. On the other hand, the closer the parasitic resonance is to the main resonance, the better the impedance characteristics, making impedance matching easier and effectively reducing matching losses, but the aperture efficiency decreases. Thus, both port-to-port and port-to-ground parasitism present a contradiction: aperture efficiency and impedance characteristics cannot be improved simultaneously.

[0040] In this embodiment, by grounding the first portion located between the first and second ends of the parasitic radiator, the parasitic radiator is divided into two parts. The first part is the portion of the parasitic radiator located between the first end and the first portion, and the second part is the portion of the parasitic radiator located between the first portion and the second end. The parasitic resonant frequency of the first part can be higher than the main resonant frequency of the main radiator, and the parasitic resonant frequency of the second part can be lower than the main resonant frequency of the main radiator. This achieves the following technical effects: improving the aperture efficiency in the high-frequency band of the main resonator; improving the aperture efficiency in the low-frequency band of the main resonator; reducing the matching loss in the high-frequency band of the main resonator; and reducing the matching loss in the low-frequency band of the main resonator.

[0041] The antenna structure, antenna tuning method, and electronic device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0042] Please see Figure 5 An antenna structure provided in this application includes a main radiator 10 and a parasitic radiator 20.

[0043] The parasitic radiator 20 includes a first end A and a second end B, with the second end B suspended in the air; the main radiator 10 includes a third end and a fourth end, with a gap 30 between the third end and the first end A, and the fourth end is grounded; the first part C of the parasitic radiator 20 is grounded, and the first part C is located between the first end A and the second end B.

[0044] In operation, the first parasitic resonant frequency of the first part AC is higher than the main resonant frequency, and the second parasitic resonant frequency of the second part CB is lower than the main resonant frequency; the main resonant frequency is the resonant frequency of the main radiator 10; the first part AC is the part of the parasitic radiator 20 located between the first end A and the first part C; the second part CB is the part of the parasitic radiator 20 located between the first part C and the second end B.

[0045] The fact that the second terminal B is left floating can be understood as: the second terminal B is not grounded and is not connected to any other electrical structure.

[0046] The third end represents the end of the main radiator 10 facing the fracture 30, and the fourth end represents the end of the main radiator 10 away from the fracture 30.

[0047] It is worth mentioning that, such as Figure 5 As shown, the end of the first part AC furthest from the break 30 is grounded, which can form a parasitic branch structure similar to mouth-to-ground parasitism; the end of the second part CB closest to the break 30 is grounded, which can form a parasitic branch structure similar to mouth-to-ground parasitism.

[0048] In this way, by grounding the first part C of the parasitic radiator 20, both the aperture-to-ground and aperture-to-ground parasitic branch structures can be integrated. Specifically, the resonance of the aperture-to-ground parasitic branch (i.e., the first parasitic resonance frequency) is higher than the main resonance, while the resonance of the aperture-to-ground parasitic branch (i.e., the second parasitic resonance frequency) is lower than the main resonance. This further enhances the aperture efficiency and impedance of the main resonance in the high-frequency range through the aperture-to-ground parasitic branch, effectively reducing the matching loss in the high-frequency range; conversely, it enhances the aperture efficiency and impedance of the main resonance in the low-frequency range, effectively reducing the matching loss in the low-frequency range.

[0049] For example: Figure 6 As shown, the first parasitic resonant frequency is higher than the main resonant frequency, and the second parasitic resonant frequency is lower than the main resonant frequency.

[0050] It should be noted that the antenna structure in this application embodiment also includes at least other radio frequency components such as the feed 50. The antenna structure provided in this application embodiment may include, for example... Figure 5 or Figure 7 Other structures or components not shown in the antenna structure.

[0051] The power supply 50 can be connected to the part of the main radiator 10 near the gap 30.

[0052] For example: Figure 5 As shown, the power supply 50 is connected to the second part D of the main radiator 10, and the distance between the second part D and the third end is less than the distance between the second part D and the fourth end.

[0053] In some implementations, the size of the first portion AC can be adjusted so that the parasitic resonance at the anastomosis point is close to and higher than the main resonance; or,

[0054] By adjusting the size of the second part CB, the parasitic resonance at the port to ground is made closer to the main resonance and lower than the main resonance.

[0055] Optionally, the length of the first part AC is less than the length of the second part CB.

[0056] In this way, the first parasitic resonant frequency generated on the first part AC can be higher than the second parasitic resonant frequency generated on the second part CB.

[0057] In practice, neither the parasitic resonance to the mouth nor the parasitic resonance to the ground can enter the main resonance, that is, the first parasitic resonance frequency, the second parasitic resonance frequency and the main resonance frequency do not overlap.

[0058] In other implementations, the parasitic resonance at the mouth and the parasitic resonance at the mouth to ground can be adjusted by a tuning module.

[0059] Optionally, such as Figure 7 As shown, the antenna structure provided in this application embodiment further includes:

[0060] Tuning module 40, which is connected to the first part C;

[0061] The tuning module 40 is used to adjust the first parasitic resonant frequency and the second parasitic resonant frequency.

[0062] In one embodiment, one end of the tuning module 40 is connected to the first part C, and the other end of the tuning module 40 is grounded. That is, the tuning module 40 is connected in series between the first part C and ground (GND).

[0063] Of course, depending on the structure of the tuning module 40, the tuning module 40 can also have other connection methods with the first part C, such as connecting the respective tuning modules to the first part AC and the second part CB respectively, without making specific limitations here.

[0064] Optionally, the tuning module 40 includes at least one of the following:

[0065] Capacitors, inductors, switches, and resistors.

[0066] For example, the tuning module 40 may include a capacitor-inductor (LC) module, the capacitance and inductance values ​​of which are adjustable to achieve the tuning function.

[0067] In one embodiment, at least one of the capacitor, inductor, and resistor is adjustable. For example, at least one of the adjustable capacitor, adjustable inductor, and adjustable resistor is provided to achieve a tuning function by adjusting the capacitance value of the adjustable capacitor, the inductance value of the adjustable inductor, and the resistance value of the adjustable resistor.

[0068] In another embodiment, the tuning module 40 may include a switch and at least two paths. Different capacitors, inductors, and resistors may be set in different paths. By adjusting the switching state of the switch, the connected paths in the tuning module 40 can be switched to achieve the tuning function.

[0069] In some implementations, the first parasitic resonant frequency can be adjusted by the tuning module 40 to be close to, but higher than, the main resonant frequency. For example, the tuning function of the tuning module 40 can be used to make the minimum frequency of the first parasitic resonant frequency slightly higher than the maximum frequency of the main resonant frequency; or...

[0070] The second parasitic resonant frequency can be adjusted to be close to, but lower than, the main resonant frequency through the tuning module 40. For example, the maximum frequency of the second parasitic resonant frequency can be slightly lower than the minimum frequency of the main resonant frequency through the tuning function of the tuning module 40.

[0071] It is worth noting that, compared to the method in related technologies that adjusts the length of the parasitic branch to adjust the parasitic resonance by adjusting the first and second parasitic resonant frequencies through the tuning module 40, the tuning of the first and second parasitic resonant frequencies is more flexible and reduces the frequency of modifying the parasitic branch size. Furthermore, by switching the resonant positions of the parasitic port and the parasitic port to ground, the resonance generated by other modes of the main branch can be improved.

[0072] In this embodiment, by grounding the first portion located between the first and second ends of the parasitic radiator, the parasitic radiator is divided into two parts. The first part is the portion of the parasitic radiator located between the first end and the first portion, and the second part is the portion of the parasitic radiator located between the first portion and the second end. The parasitic resonant frequency of the first part can be higher than the main resonant frequency of the main radiator, and the parasitic resonant frequency of the second part can be lower than the main resonant frequency of the main radiator. This achieves the following technical effects: improving the aperture efficiency in the high-frequency band of the main resonator; improving the aperture efficiency in the low-frequency band of the main resonator; reducing the matching loss in the high-frequency band of the main resonator; and reducing the matching loss in the low-frequency band of the main resonator.

[0073] Please see Figure 8 This application also provides an antenna tuning method, wherein the subject performing the antenna tuning method may be as follows: Figures 5 to 7 The antenna structure shown in any of the above, or having the following characteristics, is... Figures 5 to 7 The electronic device or apparatus with the antenna structure shown in any of the above is not specifically limited herein.

[0074] like Figure 8 As shown, the antenna tuning method may include the following steps:

[0075] Step 801: Obtain the main resonant frequency of the main radiator.

[0076] In one embodiment, the main resonant frequency can be obtained from the radio frequency circuit corresponding to the antenna structure, such as obtaining the frequency of the excitation current of the feed connected to the main branch as the main resonant frequency.

[0077] In another implementation, the main resonant frequency can be obtained from the control unit of an electronic device with an antenna structure, such as obtaining the radio frequency required for the communication service from the application processor when providing a communication service.

[0078] Step 802: Tune the parasitic radiator according to the main resonant frequency so that the first parasitic resonant frequency of the first part of the parasitic radiator is higher than the main resonant frequency, and the second parasitic resonant frequency of the second part of the parasitic radiator is lower than the main resonant frequency.

[0079] Optionally, tuning the parasitic radiator according to the principal resonant frequency includes:

[0080] Adjust the length of the first portion so that the first parasitic resonant frequency is higher than the principal resonant frequency; or,

[0081] The length of the second part is adjusted so that the second parasitic resonant frequency is lower than the main resonant frequency.

[0082] Optionally, when the antenna structure includes a tuning module, the tuning of the parasitic radiator according to the main resonant frequency includes at least one of the following:

[0083] According to the main resonant frequency, the first parameter of the tuning module is adjusted, wherein the first parameter includes at least one of the following: capacitance value, inductance value, and resistance value.

[0084] Optionally, at least one of the first difference and the second difference is less than or equal to the target threshold;

[0085] Wherein, the first difference is the difference between the minimum frequency of the first parasitic resonant frequency and the maximum frequency of the main resonant frequency; the second difference is the difference between the maximum frequency of the second parasitic resonant frequency and the minimum frequency of the main resonant frequency.

[0086] In one implementation, the target threshold may be a preset threshold or a minimum frequency measurement unit.

[0087] In another embodiment, at least one of the first difference and the second difference being less than or equal to the target threshold may include: the first parasitic resonant frequency being higher than the main resonant frequency, the first parasitic resonant frequency being as close as possible to the main resonant frequency, and the first parasitic resonant frequency not overlapping with the main resonant frequency; or, the second parasitic resonant frequency being lower than the main resonant frequency, the second parasitic resonant frequency being as close as possible to the main resonant frequency, and the second parasitic resonant frequency not overlapping with the main resonant frequency.

[0088] The antenna tuning method provided in this application embodiment, through such... Figures 5 to 7 Tuning the antenna structure shown in any one of the above not only improves the impedance matching characteristics in the high-frequency band of the main resonance, but also improves the impedance matching characteristics in the low-frequency band of the main resonance, while retaining the advantage of using parasitic branches to improve antenna aperture efficiency. For a detailed explanation, please refer to... Figures 5 to 7 Explanation of the antenna structure embodiment shown.

[0089] This application also provides an electronic device, which has the following features: Figures 5 to 7 Any of the antenna structures provided in the illustrated embodiments.

[0090] In some embodiments, the aforementioned electronic device can be a terminal or other devices besides a terminal. A terminal can be a mobile electronic device or a non-mobile electronic device. For example, a mobile electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. Non-mobile electronic devices can also be servers, network attached storage (NAS), personal computers (PCs), television sets (TVs), ATMs, or self-service machines, etc. This application does not specifically limit the scope of the embodiments.

[0091] In the embodiments of this application, it can be based on, as follows Figures 5 to 7 The communication control circuit provided in any embodiment improves the antenna aperture efficiency by utilizing parasitic branches in the antenna structure of the electronic device, while also improving the impedance matching characteristics of the main resonant high-frequency band and covering the impedance matching characteristics of the main resonant low-frequency band.

[0092] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0093] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0094] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An antenna structure, characterized in that, include: Primary radiator and parasitic radiator; The parasitic radiator includes a first end and a second end, with the second end suspended in the air; The main radiator includes a third end and a fourth end, the third end having a gap between it and the first end, and the fourth end being grounded; The first part of the parasitic radiator is grounded, and the first part is located between the first end and the second end; Wherein, the first parasitic resonant frequency of the first part is higher than the main resonant frequency, and the second parasitic resonant frequency of the second part is lower than the main resonant frequency; the main resonant frequency is the resonant frequency of the main radiator; the first part is the portion of the parasitic radiator located between the first end and the first part; the second part is the portion of the parasitic radiator located between the first part and the second end.

2. The antenna structure according to claim 1, characterized in that, Also includes: A tuning module, one end of which is connected to the first part, and the other end of which is grounded; The tuning module is used to adjust the first parasitic resonant frequency and the second parasitic resonant frequency.

3. The antenna structure according to claim 2, characterized in that, The tuning module includes at least one of the following: Capacitors, inductors, switches, and resistors.

4. The antenna structure according to any one of claims 1 to 3, characterized in that, It also includes: a power supply, wherein the power supply is connected to a second part of the main radiator, and the distance between the second part and the third end is less than the distance between the second part and the fourth end.

5. The antenna structure according to any one of claims 1 to 3, characterized in that, The length of the first part is less than the length of the second part.

6. An antenna tuning method, characterized in that, The method, applied to an antenna structure as described in any one of claims 1 to 5, comprises: Obtain the main resonant frequency of the main radiator; The parasitic radiator is tuned according to the main resonant frequency so that the first parasitic resonant frequency of the first part of the parasitic radiator is higher than the main resonant frequency, and the second parasitic resonant frequency of the second part of the parasitic radiator is lower than the main resonant frequency.

7. The method according to claim 6, characterized in that, The tuning of the parasitic radiator according to the main resonant frequency includes: Adjust the length of the first portion so that the first parasitic resonant frequency is higher than the principal resonant frequency; or, The length of the second part is adjusted so that the second parasitic resonant frequency is lower than the main resonant frequency.

8. The method according to claim 6, characterized in that, The antenna structure includes a tuning module, which is used to adjust the first parasitic resonant frequency and the second parasitic resonant frequency; The tuning of the parasitic radiator according to the main resonant frequency includes: According to the main resonant frequency, the first parameter of the tuning module is adjusted, wherein the first parameter includes at least one of the following: capacitance value, inductance value, and resistance value.

9. The method according to any one of claims 6 to 8, characterized in that, At least one of the first difference and the second difference is less than or equal to the target threshold; Wherein, the first difference is the difference between the minimum frequency of the first parasitic resonant frequency and the maximum frequency of the main resonant frequency; the second difference is the difference between the maximum frequency of the second parasitic resonant frequency and the minimum frequency of the main resonant frequency.

10. An electronic device, characterized in that, The antenna structure includes any one of claims 1 to 5.

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