Antenna structure and electronic device

Abstract

The application relates to the technical field of wireless communication, and discloses an antenna structure and an electronic device, the antenna structure comprising a feeding arm and a grounding arm, the feeding arm comprising a first straight section and a first meandering bending section connected with each other; the grounding arm comprising a second straight section and a second meandering bending section connected with each other, the first straight section being electrically connected with the second straight section to realize resonance of a first frequency band; wherein the first straight section and the second straight section are arranged in a same line, and the first meandering bending section and the second meandering bending section are located on the same side of the first straight section. By arranging the first meandering bending section and the second meandering bending section on the feeding arm and the grounding arm respectively, the space occupation of the antenna structure in the length direction and the height direction can be reduced, the current directions between every two adjacent parallel sections in the first meandering bending section and the second meandering bending section are the same, and the electromagnetic field interference between every two adjacent parallel sections is reduced.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to an antenna structure and electronic device. Background Technology

[0002] Currently, as electronic devices gradually become thinner and smaller, the installation space for antenna structures has been greatly reduced.

[0003] However, existing antenna structures generally reduce the space occupied by the antenna structure in the antenna length direction by bending the antenna arms in a serpentine manner. This results in the currents in two adjacent and parallel segments of the bent part being in opposite directions, generating opposite electromagnetic fields that interfere with each other. Therefore, how to balance reducing the space occupied by the antenna and reducing electromagnetic interference has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The main objective of this application is to provide an antenna structure and electronic device that aims to solve the existing technical problem of how to balance reducing antenna space occupation and reducing electromagnetic interference.

[0005] To achieve the above objectives, this application proposes an antenna structure, which includes: A power supply arm, the power supply arm comprising a first straight section and a first loop-shaped bend section connected to each other; A grounding arm, the grounding arm including a second straight section and a second loop-shaped bend section connected to each other, the first straight section and the second straight section being electrically connected to achieve resonance in a first frequency band; The first straight section and the second straight section are arranged collinearly, and the first loop-shaped bend section and the second loop-shaped bend section are located on the same side of the first straight section.

[0006] In one embodiment, the first loop-shaped bend includes a plurality of sequentially connected straight feed segments, the Nth straight feed segment extending along a first direction, and the (N+1)th straight feed segment extending along a second direction. The second loop-shaped bend includes a plurality of sequentially connected straight grounding segments, the Nth straight grounding segment extending along a first direction, and the (N+1)th straight grounding segment extending along a second direction; The first direction is perpendicular to the first straight section, and the second direction is parallel to the first straight section; N is an odd number greater than 0.

[0007] In one embodiment, the feed arm has a first peripheral portion and a first inner portion that are interconnected. The first straight portion and a portion of the straight feed segments are sequentially connected to form the first peripheral portion, and another portion of the straight feed segments are sequentially connected to form the first inner portion. The distance between the first straight section and the adjacent straight feeder segment extending along the second direction in the first inner part is d1, and the thickness of the straight feeder segment and the first straight section is t1, 1.5≤d1 / t1≤6; The grounding arm has a second outer perimeter and a second inner perimeter that are interconnected. The second straight portion and a portion of the straight grounding segment are sequentially connected to form the second outer perimeter, and another portion of the straight grounding segment is sequentially connected to form the second inner perimeter. The distance between the second straight section and the adjacent straight grounding segment extending along the second direction in the second inner section is d2, and the thickness of the straight grounding segment and the second straight section is t2, 1.5≤d2 / t2≤6.

[0008] In one embodiment, the thickness t1 of the first straight section is equal to the thickness t2 of the second straight section, and 4≤(d1+d2) / (t1+t2)≤6.

[0009] In one embodiment, the distance between the linear feed segment extending along the second direction in the first peripheral portion and the adjacent linear feed segment extending along the second direction in the first inner portion is d3, and the thickness of the linear feed segment is t3, where 1.5≤d3 / t3≤6.

[0010] In one embodiment, the distance between the straight grounding segment extending along the second direction in the second peripheral portion and the adjacent straight grounding segment extending along the second direction in the second inner portion is d4, and the thickness of the straight grounding segment is t4, where 1.5≤d4 / t4≤6.

[0011] In one embodiment, the antenna structure further includes an extension arm, one end of which is electrically connected to the first straight portion, and the other end of which extends toward the second straight portion, such that the extension arm at least partially forms a coupling capacitance with the second straight portion to achieve resonance in a second frequency band, the first frequency band being different from the second frequency band.

[0012] In one embodiment, the feed arm further includes a first reverse bending portion, which connects the first straight portion and the first loop bending portion, and the first reverse bending portion and the first loop bending portion are respectively located on both sides of the axis of the first straight portion; The extended arm and the first reverse bend are located on the same side of the axis of the first straight section.

[0013] In one embodiment, the grounding arm further includes a second reverse bend portion, which connects the second straight portion and the second loop bend portion, and the second reverse bend portion and the second loop bend portion are respectively located on both sides of the axis of the second straight portion; The extended arm and the second reverse bend are located on the same side of the axis of the second straight section.

[0014] In addition, to achieve the above objectives, this application also proposes an electronic device comprising the antenna structure described above.

[0015] This application proposes an antenna structure and an electronic device. The antenna structure includes a feed arm and a ground arm. The feed arm includes a first straight section and a first loop-shaped bend section connected to each other. The ground arm includes a second straight section and a second loop-shaped bend section connected to each other. The first straight section and the second straight section are electrically connected to achieve resonance in a first frequency band. The first straight section and the second straight section are collinearly arranged, and the first loop-shaped bend section and the second loop-shaped bend section are located on the same side of the first straight section.

[0016] In this application, the antenna structure can be provided with a feed arm and a ground arm, and the ground arm is electrically connected to the feed arm. The two cooperate to form the main conductive structure of the antenna and the main radiation path of the current. The feed arm is used to connect to the feed port, and the ground arm is used to connect to the ground point, thus forming the basic working structure of the antenna. Based on this, by setting a first loop-shaped bend and a second loop-shaped bend in the feed arm and the ground arm respectively, the space occupation of the antenna structure in the length direction can be reduced. Furthermore, by placing the first loop-shaped bend and the second loop-shaped bend on the same side of the first straight section, the space occupation of the first loop-shaped bend and the second loop-shaped bend in the height direction of the antenna structure overlaps, that is, the space occupation in the height direction of the antenna structure is reduced, thus achieving a reduction in the space occupation of the antenna. In addition, in the first loop-shaped bend and the second loop-shaped bend, the current direction between each two adjacent parallel segments is the same, and the electromagnetic field direction generated is also the same, reducing the electromagnetic field interference between each two adjacent parallel segments. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the first embodiment of the antenna structure of this application; Figure 2 for Figure 1 A magnified view of a portion of the feed arm of the antenna structure; Figure 3 for Figure 1 A magnified view of a portion of the grounding arm of the antenna structure; Figure 4 for Figure 1 A magnified view of a portion of the extension arm of the central antenna structure; Figure 5 This is a schematic diagram of the feeding of the antenna structure according to the second embodiment of this application; Figure 6 for Figure 5 Schematic diagram of the coaxial feeder conductor; Figure 7 This is a return loss diagram of the second embodiment of the antenna structure in this application; Figure 8 This is a simulation diagram of the current distribution in the second embodiment of the antenna structure of this application; Figure 9 This is a radiation efficiency-frequency response curve of the second embodiment of the antenna structure in this application; Figure 10 This is a schematic diagram of the third embodiment of the antenna structure in this application.

[0020] Explanation of icon numbers: 1. Feeding arm; 11. First straight section; 12. First loop-shaped bend section; 121. Straight feeding section; 13. First reverse bend section; 2. Grounding arm; 21. Second straight section; 22. Second loop-shaped bend section; 221. Straight grounding section; 23. Second reverse bend section; 3. Extension arm; 31. Second coupling part; 4. First conductive block; 41. First coupling part; 5. Second conductive block; 61. First pad; 62. Second pad; 7. Coaxial feeder wire; 71. Center conductor; 72. Outer conductor; 73. Insulation layer; 74. Outer sheath.

[0021] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0026] Understandably, as electronic devices gradually become thinner and smaller, the installation space for antenna structures is being significantly reduced.

[0027] However, existing antenna structures generally reduce the space occupied by the antenna structure in the antenna length direction by bending the antenna arms in a serpentine manner. This results in the currents in two adjacent and parallel segments of the bent part being in opposite directions, generating opposite electromagnetic fields that interfere with each other. Therefore, how to balance reducing the space occupied by the antenna and reducing electromagnetic interference has become a technical problem that urgently needs to be solved by those skilled in the art.

[0028] To address the aforementioned shortcomings, this embodiment provides an antenna structure comprising a feed arm 1 and a ground arm 2, with the ground arm 2 electrically connected to the feed arm 1. These two components work together to form the main conductive structure and the main radiation path of the current in the antenna. The feed arm 1 connects to the feed port, and the ground arm 2 connects to the grounding point, thus constituting the basic working structure of the antenna. Furthermore, by providing a first loop-shaped bend 12 and a second loop-shaped bend 22 on the feed arm 1 and the ground arm 2 respectively, the spatial occupancy of the antenna structure in the length direction can be reduced. Moreover, by placing the first loop-shaped bend 12 and the second loop-shaped bend 22 on the same side of the first straight section 11, the spatial occupancy of the first loop-shaped bend 12 and the second loop-shaped bend 22 overlaps in the height direction of the antenna structure, thereby reducing the spatial occupancy of the antenna. In addition, in the first loop-shaped bend 12 and the second loop-shaped bend 22, the current direction between any two adjacent parallel segments is the same, and the resulting electromagnetic field direction is also the same, reducing electromagnetic interference between any two adjacent parallel segments.

[0029] For ease of understanding, the following is combined with Figures 1 to 10 The antenna assembly provided in the embodiments of this application will be described in detail.

[0030] Reference Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the antenna structure of this application. Figure 1 As shown, in this embodiment, the antenna structure includes: The power supply arm 1 includes a first straight section 11 and a first loop-shaped bend section 12 that are connected to each other. Grounding arm 2, the grounding arm 2 includes a second straight part 21 and a second loop-shaped bend part 22 connected to each other, the first straight part 11 and the second straight part 21 are electrically connected to realize resonance of the first frequency band; The first straight section 11 and the second straight section 21 are arranged collinearly, and the first loop-shaped bend section 12 and the second loop-shaped bend section 22 are located on the same side of the first straight section 11.

[0031] It should be noted that the antenna component in this embodiment can be applied in any electronic device that requires an antenna for communication. The electronic device can be a wireless communication device, such as a wireless headset, smart bracelet, smart watch, smart glasses, etc. This embodiment does not limit this.

[0032] It should be understood that both the feed arm 1 and the ground arm 2 can be made of conductive materials. They are electrically connected to each other to form the main radiating structure of the antenna. The feed arm 1 can be used to receive radio frequency feed signals, and the ground arm 2 can provide a grounding path for the signal loop. Together, they can excite and achieve resonant operation in the first frequency band. Specifically, the end of the feed arm 1 near the ground arm 2 can be electrically connected to the end of the ground arm 2 near the feed arm 1, at which point the radio frequency feed signal is input to the feed arm 1 and a grounding path is provided to the ground arm 2.

[0033] It should be noted that the power supply arm 1 and the grounding arm 2 can be disposed in different areas on the same substrate. For example, the power supply arm 1 and the grounding arm 2 can be formed on a rigid printed circuit board (PCB), a flexible printed circuit (FPC), a laser direct forming (LDS) substrate, or a plastic bracket. The manufacturing process can be any one of etching, LDS laser direct forming, stamping, or electroplating processes to meet the needs of different electronic devices.

[0034] Among them, etching is applicable to standard PCB substrates, with high forming accuracy and low cost; LDS laser direct forming process is applicable to three-dimensional curved substrates, realizing flexible forming of complex-shaped arms; stamping process is applicable to mass production of metal sheets, improving production efficiency; electroplating process can directly form conductive arms on insulating substrates, expanding the application scenarios of antennas.

[0035] The feed arm 1 and ground arm 2 can also be formed separately on different conductive components and then assembled. Before the feed connection is completed, feed arm 1 and ground arm 2 can be separated by air gaps, dielectric materials, or other insulating structures to maintain electrical isolation. After the feed connection is completed, normal electromagnetic interaction can occur between them to jointly achieve the antenna's resonance and radiation functions. The feed port of the electronic device is connected to feed arm 1, and the ground point of the electronic device is connected to ground arm 2. Their specific positions can be adjusted according to the feed structure of the terminal electronic device. For example, in electronic devices, the antenna structure can use various feeding methods such as coaxial feeding and microstrip line feeding to adapt to the connection requirements of different radio frequency circuits; this embodiment does not limit this.

[0036] Based on the feed arm 1 and grounding arm 2, by respectively setting a first loop-shaped bend 12 and a second loop-shaped bend 22 in the feed arm 1 and grounding arm 2, the space occupation of the antenna structure in the length direction can be reduced. Furthermore, by placing the first loop-shaped bend 12 and the second loop-shaped bend 22 on the same side of the first straight section 11, the space occupation of the first loop-shaped bend 12 and the second loop-shaped bend 22 in the height direction of the antenna structure overlaps, thus reducing the space occupation in the height direction of the antenna structure. In addition, in the first loop-shaped bend 12 and the second loop-shaped bend 22, the current direction between any two adjacent parallel segments is the same, and the resulting electromagnetic field direction is also the same, reducing electromagnetic field interference between any two adjacent parallel segments.

[0037] Further, please refer to Figures 2 to 3 , Figure 2 for Figure 1 A magnified view of a portion of the feed arm 1 of the antenna structure. Figure 3 for Figure 1 A magnified view of a portion of the grounding arm 2 of the antenna structure.

[0038] like Figure 2 As shown, in this embodiment, the first loop-shaped bending portion 12 includes a plurality of linear feed segments 121 connected in sequence, the Nth linear feed segment 121 extends along a first direction, and the N+1th linear feed segment 121 extends along a second direction. like Figure 3 As shown, in this embodiment, the second loop-shaped bend 22 includes a plurality of sequentially connected straight grounding segments 221, the Nth straight grounding segment 221 extends along the first direction, and the N+1th straight grounding segment 221 extends along the second direction. The first direction is perpendicular to the first straight section 11, the second direction is parallel to the first straight section 11, and N is an odd number greater than 0.

[0039] It should be noted that the first loop-shaped bend 12 is composed of multiple straight feed segments 121 connected in sequence to form a continuous loop-shaped conductive path. Similarly, the second loop-shaped bend 22 is composed of multiple straight grounding segments 221 connected in sequence to form a continuous loop-shaped conductive path.

[0040] It should also be noted that the first straight section 11 and the second straight section 21 are arranged collinearly. The extension direction of the first straight section 11 is the length direction of the antenna. Therefore, the first direction is the height direction of the antenna, and the second direction is the length direction of the antenna.

[0041] It is understandable that in feeder arm 1, the current direction between two adjacent straight feeder segments 121 extending along the first direction is the same, and the current direction between two adjacent straight feeder segments 121 extending along the second direction is also the same. The electromagnetic fields generated by the currents in the same direction are in the same direction, thus avoiding the problem of electromagnetic field cancellation and interference caused by the currents being in opposite directions between adjacent parallel segments.

[0042] It is also understandable that, in grounding arm 2, the current direction between two adjacent straight grounding segments 221 extending along the first direction is the same, and the current direction between two adjacent straight grounding segments 221 extending along the second direction is also the same. The electromagnetic fields generated by the currents in the same direction are in the same direction, which also avoids electromagnetic field interference between adjacent parallel segments.

[0043] Further, please refer to Figure 2 and Figure 3 The power supply arm 1 has a first outer perimeter and a first inner perimeter that are connected to each other. The first straight section 11 is connected to a portion of the straight power supply segment 121 in sequence to form the first outer perimeter, and another portion of the straight power supply segment 121 is connected in sequence to form the first inner perimeter. The distance between the first straight section 11 and the adjacent straight feed segment 121 extending along the second direction in the first inner circumference is d1, and the thickness of the straight feed segment 121 and the first straight section 11 is t1, 1.5≤d1 / t1≤6; The grounding arm 2 has a second outer perimeter and a second inner perimeter that are connected to each other. The second straight portion 21 is connected to a portion of the straight grounding segment 221 in sequence to form the second outer perimeter, and another portion of the straight grounding segment 221 is connected in sequence to form the second inner perimeter. The distance between the second straight section 21 and the adjacent straight grounding section 221 extending along the second direction in the second inner circumference is d2. The thickness of both the straight grounding section 221 and the second straight section 21 is t2, and 1.5≤d2 / t2≤6.

[0044] It is understood that the first outer perimeter of the feeder arm 1 is formed by sequentially connecting the first straight section 11 and some straight feeder segments 121, creating a loop-shaped outer contour. The first inner perimeter is formed by sequentially connecting another portion of straight feeder segments 121, located within the area enclosed by the first outer perimeter, forming a loop-shaped inner contour. The first outer perimeter and the first inner perimeter are interconnected. After current flows in from the first straight section 11, it flows sequentially through each straight feeder segment 121 of the first outer perimeter and then enters each straight feeder segment 121 of the first inner perimeter, or the current path can flow in the opposite direction.

[0045] The linear feed section 121 extending along the second direction in the first inner portion is parallel to and spaced apart from the first linear portion 11, with a distance d1 between them. This distance d1 and the thickness t1 of the linear feed section 121 and the first linear portion 11 satisfy a proportional relationship of 1.5 ≤ d1 / t1 ≤ 6. This proportional relationship takes into account both impedance matching adjustment and electrical isolation between adjacent parallel sections.

[0046] When the ratio of d1 / t1 is less than 1.5, the distance between the first straight section 11 and the adjacent straight feed section 121 extending along the second direction in the first inner circumference section is too small. The coupling capacitance between them increases significantly, resulting in a decrease in the electrical isolation performance between adjacent parallel sections, enhanced parasitic coupling, and the generation of additional electromagnetic interference. Furthermore, the small distance between them places higher demands on actual processing and increases the processing difficulty.

[0047] When the ratio of d1 / t1 is greater than 6, the distance between the first straight section 11 and the adjacent inner straight feed section 121 is too large, weakening the electromagnetic coupling between them. This significantly reduces the impedance matching adjustment capability for low-frequency resonance, making it difficult to achieve the required impedance characteristics through spacing adjustment. Consequently, the return loss of the antenna in the target frequency band increases, and the matching performance deteriorates. Therefore, limiting the ratio of d1 / t1 to the range of 1.5 to 6 can maintain effective impedance matching adjustment capability while ensuring good electrical isolation between adjacent parallel sections.

[0048] Similarly, the second outer perimeter of the grounding arm 2 is formed by sequentially connecting the second straight section 21 and some straight grounding segments 221, creating a loop-shaped outer contour. The second inner perimeter is formed by sequentially connecting another portion of straight grounding segments 221, located inside the area enclosed by the second outer perimeter, forming a loop-shaped inner contour. The second outer perimeter and the second inner perimeter are interconnected. After current flows in from the second straight section 21, it flows sequentially through each straight grounding segment 221 of the second outer perimeter, and then enters each straight grounding segment 221 of the second inner perimeter.

[0049] The straight grounding segment 221 extending along the second direction in the second inner portion is parallel to and spaced apart from the second straight portion 21, with a distance of d2 between them. This distance d2 satisfies the proportional relationship of 1.5≤d2 / t2≤6 with respect to the thickness t2 of the straight grounding segment 221 and the second straight portion 21. Its function is the same as the d1 / t1 proportional relationship in the feeder arm 1, which is used to take into account both impedance matching adjustment and electrical isolation of the grounding arm 2.

[0050] In this embodiment, both the grounding arm 2 and the power supply arm 1 are set with equal thickness. That is, the thickness of the first straight section 11 and each straight power supply segment 121 is equal, and the thickness of the second straight section 21 and each straight grounding segment 221 is equal. The thickness can be 0.1mm. When the distance between adjacent straight power supply segments 121 extending along the second direction in the first inner circumference is between 0.15mm and 0.6mm, it has the significance of adjusting impedance matching. After exceeding 0.6mm, the adjustment effect on impedance matching is significantly reduced.

[0051] Further, please refer to Figures 1 to 3 In order to ensure that the first resonance falls within the frequency range of 2.4-2.48GHz, the thickness t1 of the first straight section 11 is equal to the thickness t2 of the second straight section 21, and 4≤(d1+d2) / (t1+t2)≤6.

[0052] Understandably, the first straight section 11 and the second straight section 21 use the same thicknesses t1 and t2, which makes the feed arm 1 and the ground arm 2 symmetrical in terms of conductive cross-section and current carrying capacity. This is beneficial for maintaining the current distribution balance and radiation efficiency stability of the antenna structure in the resonant state. When t1 and t2 are equal, the overall conductive path formed by the collinear connection of the first straight section 11 and the second straight section 21 is continuous and uniform in physical parameters, avoiding impedance discontinuities and signal reflections caused by abrupt changes in thickness, thereby ensuring the purity and stability of the first frequency band resonance.

[0053] It should be noted that limiting the ratio of (d1+d2) to (t1+t2) to the range of 4 to 6 is based on the comprehensive optimization results of the resonant characteristics of the 2.4-2.48GHz frequency band.

[0054] When the ratio (d1+d2) / (t1+t2) is less than 4, the sum of the relative thicknesses of the total spacing between the main radiating arm and the adjacent inner parallel segment in the feed arm 1 and ground arm 2 is too small, resulting in excessive coupling capacitance between the first straight section 11 and the first inner section, and between the second straight section 21 and the second inner section. This excessive coupling capacitance increases the equivalent capacitance of the antenna structure. According to the relationship between the resonant frequency and the equivalent inductance and equivalent capacitance, the resonant frequency shifts to a lower frequency, potentially below the lower limit of 2.4 GHz, failing to cover the initial part of the target frequency band. Simultaneously, the excessively small total spacing enhances the electromagnetic coupling between the feed arm 1 and the ground arm 2, reduces the radiation resistance, and decreases the antenna's radiation efficiency.

[0055] When the ratio (d1+d2) / (t1+t2) is greater than 6, the sum of the relative thicknesses of the total spacing between the main radiating arm and the adjacent inner parallel segment is too large, resulting in an insufficient coupling capacitance. This insufficient coupling capacitance reduces the equivalent capacitance of the antenna structure, causing the resonant frequency to shift to higher frequencies, potentially exceeding the upper limit of 2.48 GHz, thus failing to cover the termination portion of the target frequency band. Simultaneously, the excessively large total spacing weakens the electromagnetic coupling between the main radiating arm and the inner segment, resulting in insufficient impedance matching adjustment capability. Consequently, the real and imaginary parts of the antenna impedance in the 2.4-2.48 GHz band cannot simultaneously meet the matching requirements, increasing return loss and degrading antenna performance.

[0056] Limiting the ratio of (d1+d2) / (t1+t2) to within the range of 4 to 6 achieves good resonance characteristics and impedance matching in the 2.4-2.48 GHz frequency band. This ratio range ensures a reasonable balance between the equivalent capacitance and equivalent inductance of the antenna structure, resulting in a stable resonant frequency within the target frequency band. Simultaneously, the spacing and thickness ratio within this range guarantees adequate electromagnetic coupling between the main radiating arm and the inner perimeter, providing sufficient impedance matching adjustment capability while maintaining electrical isolation between adjacent parallel segments, thus avoiding simulation identification errors and parasitic coupling problems in actual manufacturing.

[0057] Further, please refer to Figure 1 and Figure 2 In order to maintain effective impedance matching adjustment capability while ensuring good electrical isolation between adjacent parallel segments in the first inner part, the distance between the linear feed segment 121 extending along the second direction in the first outer part and the adjacent linear feed segment 121 extending along the second direction in the first inner part is d3, and the thickness of the linear feed segment 121 is t3, 1.5≤d3 / t3≤6.

[0058] When the ratio of d3 / t3 is less than 1.5, the distance between adjacent linear feed segments 121 extending along the second direction in the first inner circumference is too small, resulting in a significant increase in the coupling capacitance between them. This leads to a decrease in the electrical isolation performance between adjacent parallel segments, enhanced parasitic coupling, and the generation of additional electromagnetic interference. Furthermore, the excessively small distance between them places higher demands on actual processing, increasing the difficulty of manufacturing.

[0059] When the ratio of d3 / t3 is greater than 6, the distance between adjacent linear feed segments 121 in the first inner section is too large, weakening the electromagnetic coupling between them. This significantly reduces the impedance matching adjustment capability for low-frequency resonance, making it difficult to achieve the required impedance characteristics through spacing adjustment. Consequently, the return loss of the antenna in the target frequency band increases, and the matching performance deteriorates. Therefore, limiting the ratio of d3 / t3 to the range of 1.5 to 6 can maintain effective impedance matching adjustment capability while ensuring good electrical isolation between adjacent parallel segments.

[0060] Further, please refer to Figure 1 and Figure 3 In order to maintain effective impedance matching adjustment capability while ensuring good electrical isolation between adjacent parallel segments in the second inner part, the distance between the straight grounding segment 221 extending along the second direction in the second outer part and the adjacent straight grounding segment 221 extending along the second direction in the second inner part is d4, and the thickness of the straight grounding segment 221 is t4, 1.5≤d4 / t4≤6.

[0061] When the ratio of d4 / t4 is less than 1.5, the distance between adjacent straight grounding segments 221 extending along the second direction in the second inner part is too small, resulting in a significant increase in the coupling capacitance between them. This leads to a decrease in the electrical isolation performance between adjacent parallel segments, enhanced parasitic coupling, and the generation of additional electromagnetic interference. Furthermore, the excessively small distance between them places higher demands on actual processing, increasing the difficulty of manufacturing.

[0062] When the ratio of d4 / t4 is greater than 6, the distance between adjacent straight grounding segments 221 in the second inner section is too large, weakening the electromagnetic coupling between them. This significantly reduces the impedance matching adjustment capability for low-frequency resonance, making it difficult to achieve the required impedance characteristics through spacing adjustment. Consequently, the return loss of the antenna in the target frequency band increases, and the matching performance deteriorates. Therefore, limiting the ratio of d4 / t4 to the range of 1.5 to 6 can maintain effective impedance matching adjustment capability while ensuring good electrical isolation between adjacent parallel segments.

[0063] Further, please refer to Figure 1 and Figure 4 , Figure 4 for Figure 1 A magnified view of a portion of the extension arm 3 of the antenna structure.

[0064] like Figure 1 and Figure 4 As shown, the antenna structure also includes an extension arm 3, one end of which is electrically connected to the first straight section 11, and the other end of which extends toward the second straight section 21, so that the extension arm 3 at least partially forms a coupling capacitor with the second straight section 21 to achieve resonance in the second frequency band, the first frequency band being different from the second frequency band.

[0065] It should be noted that, currently, as the demand for multi-band communication in electronic devices continues to increase, antennas need to be compatible with multiple frequency bands simultaneously. However, existing antenna structures generally achieve multi-band operation by increasing the size of the radiator, adding radiating elements or parasitic structures, or adopting multi-branch structures. Although these methods can achieve multi-band operation, they significantly increase the complexity of the antenna structure and make it difficult to achieve wide bandwidth characteristics.

[0066] It is understood that, in this embodiment, the antenna structure adds an extension arm 3 to the feed arm 1 and ground arm 2, and one end of the extension arm 3 is electrically connected to the first straight section 11. This creates an additional radiation path, introducing a new current distribution. Thus, the main radiation path can achieve resonance in the first frequency band, and the additional radiation path introduced by the extension arm 3 can achieve resonance in the second frequency band. Furthermore, the other end of the extension arm 3 forms a coupling capacitor with the second straight section 21, modulating the overall current distribution even without a direct electrical connection between the extension arm 3 and the ground arm 2, thereby expanding the operating bandwidth of the second frequency band. Therefore, the extension arm 3 in the antenna structure of this application introduces a new current path component, thereby forming an additional resonant mode and expanding the operating bandwidth, achieving the effect of increasing the antenna frequency band while maintaining a wide bandwidth.

[0067] It should also be understood that the extension arm 3 can also be made of conductive material. As shown in the figure, one end of the extension arm 3 can be electrically connected to the feed arm 1, and the other end of the extension arm 3 can extend towards the ground arm 2, so that at least a part of the structure of the extension arm 3 is close to the ground arm 2 and maintains a non-direct electrical connection, thereby forming a coupling capacitor between the extension arm 3 and the ground arm 2. This coupling capacitor can introduce additional resonant modes, enabling the antenna to achieve resonant operation in a second frequency band different from the first frequency band. Optionally, the extension arm 3 can be an additional structure connected to the feed arm 1. Preferably, the extension arm 3 can be an integrally formed structure with the feed arm 1 to improve the compactness of the structure and ensure stable conductivity.

[0068] It is important to emphasize that the feed arm 1, ground arm 2, and extension arm 3 work together to form a complete multi-frequency radiation system. The main radiation path formed by the feed arm 1 and ground arm 2 is responsible for the stable resonance of the first frequency band. The extension arm 3 forms a new current path component through coupling, which increases the operating frequency band of the antenna. At the same time, the coupling structure can modulate the current distribution, further widening the operating bandwidth of the second frequency band, so that the antenna can meet the multi-frequency operating requirements while having better broadband characteristics.

[0069] Further, please refer to Figure 1 and Figure 4 In order to facilitate the formation of coupling capacitance and the adjustment of impedance matching, the multi-frequency antenna further includes a first conductive block 4, which is electrically connected to the grounding arm 2 and extends along the direction from the grounding arm 2 to the extension arm 3, so that the extension arm 3 at least partially forms a coupling capacitance with the first conductive block 4.

[0070] It should be understood that the first conductive block 4 extends directionally along the direction from the grounding arm 2 to the extension arm 3. Through the structure of the first conductive block 4, at least a portion of the extension arm 3 can be positioned opposite the top end face of the first conductive block 4, thereby forming a stable coupling capacitor between the extension arm 3 and the first conductive block 4. Compared to relying solely on the spatial gap between the extension arm 3 and the grounding arm 2 for coupling, the introduction of the first conductive block 4 allows for flexible adjustment of the capacitance value by adjusting its height, the area facing the extension arm 3, and the gap spacing. This enables precise modulation of the current distribution, thereby optimizing the impedance matching performance of the first and / or second frequency bands.

[0071] In this embodiment, the first conductive block 4 can be a metal structure integrally formed with the grounding arm 2, and the first conductive block 4 is rectangular. It should be noted that the size, shape, and connection position of the first conductive block 4 can be flexibly adjusted to further optimize the impedance matching performance of the first frequency band and / or the second frequency band. The shape of the extension arm 3 can also be flexibly adjusted, as long as at least a portion of the extension arm 3 and at least a portion of the first conductive block 4 are close to each other and form a coupling capacitor.

[0072] Further, please refer to Figure 1 and Figure 4 In order to facilitate the modulation of a coupling capacitor that meets actual needs, a first coupling portion 41, which is at least partially planar, is formed on the first conductive block 4, and a second coupling portion 31, which is at least partially planar, is formed on the extension arm 3. The first coupling portion 41 and the second coupling portion 31 are arranged opposite to each other to form a coupling capacitor.

[0073] It should be understood that by arranging the two planes of the first coupling part 41 and the second coupling part 31 opposite each other, it is convenient to precisely control the relative facing area and gap distance of the two plates that make up the coupling capacitor, thereby flexibly and stably adjusting parameters such as the capacitance value of the coupling capacitor. Compared with irregular and complex shape structures, the technical solution of this embodiment can realize controllable and precise modulation of the capacitance value of the coupling capacitor. That is, it is convenient to adjust the relative area and spacing of the first coupling part 41 and the second coupling part 31 according to the frequency band requirements of the actual application scenario to obtain the target coupling capacitance value, thereby precisely controlling the resonant frequency and operating bandwidth of the antenna in the high-frequency band, further optimizing the impedance matching performance of the antenna, and improving the stability and adaptability of multi-band communication.

[0074] It should be noted that in this embodiment, the two planes of the first coupling part 41 and the second coupling part 31 are arranged opposite to each other. This can be two planes in which the projection of one onto the other coincides with the projection of the other plane itself. Preferably, the two planes are parallel to each other. Figure 2As shown, when two planes are parallel to each other, the gap between the two planes is denoted as d. Preferably, 0.1mm < d < 0.5mm. This size range can meet the precision requirements of existing LDS laser direct forming and other processing technologies, avoid the increase in processing difficulty and decrease in yield due to the gap being too small, and also enable the formation of a sufficient coupling electric field between the two planes to ensure that the capacitance value of the coupling capacitor meets the design requirements of high-frequency resonance and impedance matching of the antenna, so as to realize the stable and controllable coupling capacitor parameters and the mass production of the antenna.

[0075] Further, please refer to Figure 1 and Figure 2 In order to achieve the connection between the extension arm 3 and the feed arm 1 and to adjust the impedance matching, the multi-frequency antenna also includes a second conductive block 5, which is electrically connected to the extension arm 3 and the feed arm 1.

[0076] In this embodiment, the second conductive block 5 can be a metal structure integrally formed with the extension arm 3 and the feed arm 1, and the second conductive block 5 is rectangular. The extension arm 3, the second conductive block 5 and the feed arm 1 form a stable electrical conduction path, providing reliable radio frequency signal excitation for the extension arm 3 and ensuring the stable realization of the coupling between the extension arm 3 and the grounding arm 2.

[0077] Further, please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the feeding of the antenna structure according to the second embodiment of this application. Figure 6 for Figure 5 A schematic diagram of the structure of the coaxial feeder 7.

[0078] like Figure 5 As shown, the antenna structure also includes a first pad 61, a second pad 62, and a coaxial feed wire 7; The first pad 61 is electrically connected to the first straight section 11 of the power supply arm 1, the second pad 62 is electrically connected to the second straight section 21 of the grounding arm 2, the center conductor 71 of the coaxial power supply wire 7 is electrically connected to the first pad 61, and the outer conductor 72 of the coaxial power supply wire 7 is electrically connected to the second pad 62.

[0079] like Figure 6 As shown, the coaxial feed conductor 7 consists of, from the inside out, a center conductor 71, an insulation layer 73, an outer conductor 72 (with shielding), and an outer sheath 74. The center conductor 71 and the outer conductor 72 are electrically isolated by the insulation layer 73, and the outer conductor 72 is covered by the outer sheath 74 for protection. This continuous shielding structure formed by the outer conductor 72 effectively blocks external electromagnetic interference and reduces the outward radiation of internal signals. Furthermore, this structure occupies little space, has reliable welded connections, and is suitable for use in confined spaces.

[0080] It should be understood that the feeding method using pads and coaxial feed wires 7 in this embodiment has significant advantages over other feeding methods such as microstrip lines and probes, including compact structure and small space occupation. The pads can be directly integrated into the feed end of the antenna radiator without the need for additional complex feed lines. The coaxial feed wires 7 have a thin wire diameter, which can flexibly adapt to the narrow installation space inside the terminal equipment, without the concern of large space occupation when using microstrip lines. At the same time, it can effectively suppress signal interference during the feeding process, ensure the signal transmission stability of the antenna when operating in multiple frequency bands, and further improve the space utilization and communication performance of electronic equipment. In addition, the pads have a large contact area and strong welding, which has higher connection strength and conductivity reliability compared to spring contact, probe contact and other methods, and is less prone to poor contact or open circuit problems due to vibration and assembly stress.

[0081] It should also be noted that, in order to achieve multi-band coverage, such as the 2.4GHz, 5GHz, and 6GHz bands required by the seventh-generation wireless network technology (Wi-Fi 7) standard, the lengths of the aforementioned feeder arm 1, grounding arm 2, and extension arm 3, as well as the spacing between them, need to be designed collaboratively. By adjusting the lengths of feeder arm 1, extension arm 3, and the distance between extension arm 3 and grounding arm 2, the resonant characteristics of different frequency bands can be adjusted.

[0082] To facilitate understanding, the following will combine... Figures 7 to 9 The practical application of Example 1 under the Wi-Fi 7 standard will be described.

[0083] Under the Wi-Fi 7 standard, the resonance of the first frequency band can be a low-frequency resonance (2.4GHz band), and the resonance of the second frequency band can be a high-frequency resonance (5GHz and 6GHz band). In order to balance low-frequency resonance and high-frequency bandwidth, the length of the extension arm 3, the length of the power supply arm 1, and the length of the grounding arm 2 are increased sequentially, and the extension arm 3 and the grounding arm 2 form a coupling capacitor.

[0084] Understandably, the low-frequency characteristics are mainly determined by the main current path formed by the feed arm 1 and the ground arm 2. To enable the antenna to stably achieve resonance in the 2.4GHz band, the length of the feed arm 1 needs to meet the electrical length requirements of the corresponding frequency band, so that the main radiation path formed by the feed arm 1 and the ground arm 2 can form an effective resonance near 2.4GHz. The high-frequency characteristics are achieved through the modulation of the current distribution by the extension arm 3 and the spatial coupling between the extension arm 3 and the ground arm 2. To achieve resonance in the 6GHz band, the length of the extension arm 3 needs to meet the electrical length requirements adapted to the 6GHz operating frequency band and be able to excite the corresponding parasitic resonant modes. Therefore, the length of the feed arm 1 is greater than the length of the extension arm 3.

[0085] In order to effectively simulate the ground plane effect and adjust the impedance matching of the antenna, the length of the grounding arm 2 is set to be greater than the length of the feed arm 1 in this embodiment. The longer grounding arm 2 can better represent the ground plane and optimize the overall impedance matching state of the antenna.

[0086] It should be noted that without the extension arm 3, the antenna can only achieve good resonance in the 2.4GHz band. Signal strength is weaker and the operating bandwidth is narrower in the 5GHz band, resulting in a lower reflection coefficient (Si) at the corresponding RF port. 11 The S11 parameter is poor and cannot meet the actual usage requirements (<-4dB). It is understandable that the S11 parameter characterizes the impedance matching degree of the antenna or RF circuit, while return loss is a loss parameter calculated based on the reflection coefficient. The two are numerically opposites; return loss equals a negative S11 parameter. The smaller the S11 parameter, the less reflected signal energy, and the greater the corresponding return loss, indicating better impedance matching and higher signal transmission and radiation efficiency.

[0087] After introducing extension arm 3, the coupling capacitance formed by extension arm 3 and ground arm 2 can optimize and modulate the overall current distribution of the antenna, improve the impedance matching and radiation characteristics of the 5GHz band, and significantly improve the bandwidth and S11 parameters of the 5GHz band (<-15dB), which can stably meet the usage requirements (<-4dB). At the same time, the coupling capacitance formed by extension arm 3 and ground arm 2 increases the bandwidth of the antenna at 6GHz. Since the resonant points at 5GHz and 6GHz are relatively close and their bandwidths overlap, a wide bandwidth is formed. Combined with the above-mentioned low-frequency resonance of the antenna in the 2.4GHz band, and the fact that the coupling capacitance between extension arm 3 and ground arm 2 will not seriously interfere with this low-frequency resonance, both low-frequency resonance and high-frequency bandwidth are taken into account.

[0088] Please refer to Figures 7 to 9 , Figure 7 This is a return loss diagram for the first embodiment of the antenna structure in this application. The horizontal axis, Frequency / GHz, represents the antenna's operating frequency, and the vertical axis, dB, represents the amplitude of the S11 parameter (return loss). The more negative (smaller) the value, the lower the antenna's reflected power and the better the impedance matching. Figure 7 It can be seen that the antenna forms three obvious resonant points at a (2.45GHz), b (5.1GHz), and c (6.7GHz), where the S11 parameter is less than -4dB, the impedance matching is excellent, and it effectively covers the WLAN application requirements of the 2.4GHz, 5GHz, and 6GHz frequency bands, verifying the performance advantages of the antenna structure of the present invention.

[0089] Figure 8This is a simulation diagram of the current distribution in the first embodiment of the antenna structure of this application. The arrows represent the direction of the current, and the length and color of the arrows correspond to the magnitude of the current. The long red arrows represent high current intensity, and the short blue arrows represent low current intensity. The fact that the red arrows are longer than the blue arrows also reflects the magnitude of the current. Figure 8 Neutron diagrams a, b, and c correspond to Figure 7 There are three locations: a, b, and c. (From...) Figure 8 It can be seen that in the 2.4GHz low-frequency band, the current is mainly concentrated in the main radiation path formed by the feeder arm 1 and the grounding arm 2, and the current amplitude in the extension arm 3 region is extremely low, which verifies the design principle that the low-frequency resonance is dominated by the main radiation path. In the 5GHz mid-frequency band, the current in the extension arm 3 region is significantly enhanced. Through the modulation effect on the overall current distribution, the impedance matching and radiation performance of this frequency band are optimized, enabling the originally poor-performing 5GHz frequency band to achieve effective resonance. In the 6GHz high-frequency band, the current is highly concentrated in the coupling region of the extension arm 3 and the grounding arm 2, and the current in the main radiation path is greatly reduced, which verifies the design principle that the high-frequency resonance is independently excited by the spatial coupling effect of the extension arm 3 and the grounding arm 2.

[0090] Figure 9 This is a radiation efficiency-frequency response curve for the first embodiment of the antenna structure in this application. The horizontal axis, Frequency / GHz, represents the antenna's operating frequency, and the vertical axis, dB, represents the radiation efficiency in decibels. The closer the value is to 0 dB, the higher the antenna's radiation efficiency and the lower the energy loss. It should be noted that... Figure 9 Only the curves within the Wi-Fi 7 standard frequency band are retained. Figure 9 It can be seen that the peak radiation efficiency of the antenna in the 2.4GHz band is close to 0dB. In the high-frequency band from 5GHz to 7.15GHz, the overall radiation efficiency is stable above -1dB, with only a slight attenuation in the band above 7GHz. This indicates that the antenna has excellent radiation performance and low energy loss in the target WLAN operating frequency bands of 2.4GHz, 5GHz, and 6GHz, which can effectively meet the practical application requirements of multi-band broadband communication under the Wi-Fi 7 standard, further verifying the performance advantages of the antenna structure of this invention.

[0091] Further, please refer to Figure 10 , Figure 10 This is a schematic diagram of the antenna structure according to the third embodiment of this application. In order to further reduce the space occupied by the antenna in the height direction, the feed arm 1 also includes a first reverse bending portion 13, which connects the first straight portion 11 and the first loop bending portion 12. The first reverse bending portion 13 and the first loop bending portion 12 are respectively located on both sides of the axis of the first straight portion 11; the extension arm 3 and the first reverse bending portion 13 are located on the same side of the axis of the first straight portion 11.

[0092] It should be understood that by setting the first reverse bending part 13, the extension length of the first loop bending part 12 can be reduced while meeting the length requirements of the feed arm 1. Since the extension arm 3 occupies a certain amount of height space when connected to the feed arm 1 through the second conductive block 5 or other means, this embodiment sets the first reverse bending part 13 on the same side as the extension arm 3. This allows the remaining idle area after the extension arm 3 occupies the height space to arrange the first reverse bending part 13, avoiding the first loop bending part 12 from occupying additional height space on the other side. This maximizes the utilization of height space, effectively saves space waste in the height direction, and further realizes the miniaturization design of the antenna, adapting to a more compact installation environment inside the terminal equipment.

[0093] Similarly, in order to further reduce the space occupied by the antenna in the height direction, the grounding arm 2 also includes a second reverse bending portion 23, which connects the second straight portion 21 and the second loop bending portion 22. The second reverse bending portion 23 and the second loop bending portion 22 are located on both sides of the axis of the second straight portion 21, respectively; the extension arm 3 and the second reverse bending portion 23 are located on the same side of the axis of the second straight portion 21.

[0094] It should be understood that by setting the second reverse bend 23, the extension length of the second loop bend 22 can be reduced while meeting the length requirements of the grounding arm 2. Since the grounding arm 2 occupies a certain amount of vertical space when it forms a coupling capacitor with the extension arm 3 through the first conductive block 4, etc., in this embodiment, the second reverse bend 23 is set on the same side as the extension arm 3. The second reverse bend 23 can be arranged in the remaining idle area after the extension arm 3 occupies the vertical space, avoiding the second loop bend 22 from occupying additional vertical space on the other side. This maximizes the utilization of vertical space, effectively saves vertical space waste, and further realizes the miniaturization design of the antenna, adapting to the more compact installation environment inside the terminal equipment.

[0095] It should be noted that the size, shape, and connection position of the first conductive block 4 and the second conductive block 5 can be flexibly adjusted, thereby flexibly adjusting the impedance transition state between the extension arm 3 and the feed arm 1 and optimizing the overall input impedance of the antenna. For example... Figure 10 As shown, inclined surfaces can be provided on both sides of the first conductive block 4, and the inclined surfaces on both sides can be set at different inclination angles. The second conductive block 5 can be set with reference to the first conductive block 4. In addition to setting inclined surfaces, other shapes can also be set, such as curved surfaces, stepped surfaces, etc., which are not limited in this embodiment.

[0096] In addition, to achieve the above objectives, embodiments of this application also provide an electronic device, including the antenna structure described above.

[0097] It is understood that the aforementioned electronic devices may be, but are not limited to, smartphones, tablets, wireless headphones, etc. By integrating the aforementioned antenna structure, the electronic devices can meet the requirements of miniaturization design.

[0098] It should be emphasized that, since the specific implementation of the electronic device in this embodiment can refer to the above-described antenna structure embodiments, the electronic device in this embodiment can have all the beneficial effects achieved by the above-described antenna structure embodiments, and this embodiment will not elaborate on this.

[0099] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An antenna structure, characterized in that, The antenna structure includes: A power supply arm, the power supply arm comprising a first straight section and a first loop-shaped bend section connected to each other; A grounding arm, the grounding arm including a second straight section and a second loop-shaped bend section connected to each other, the first straight section and the second straight section being electrically connected to achieve resonance in a first frequency band; The first straight section and the second straight section are arranged collinearly, and the first loop-shaped bend section and the second loop-shaped bend section are located on the same side of the first straight section.

2. The antenna structure as described in claim 1, characterized in that, The first loop-shaped bend includes a plurality of linear feed segments connected in sequence, the Nth linear feed segment extends along a first direction, and the (N+1)th linear feed segment extends along a second direction. The second loop-shaped bend includes a plurality of sequentially connected straight grounding segments, the Nth straight grounding segment extending along a first direction, and the (N+1)th straight grounding segment extending along a second direction; The first direction is perpendicular to the first straight section, and the second direction is parallel to the first straight section; N is an odd number greater than 0.

3. The antenna structure as described in claim 2, characterized in that, The power supply arm has a first outer perimeter and a first inner perimeter that are interconnected. The first straight section and a portion of the straight power supply segments are connected in sequence to form the first outer perimeter, and another portion of the straight power supply segments are connected in sequence to form the first inner perimeter. The distance between the first straight section and the adjacent straight feeder segment extending along the second direction in the first inner part is d1, and the thickness of the straight feeder segment and the first straight section is t1, 1.5≤d1 / t1≤6; The grounding arm has a second outer perimeter and a second inner perimeter that are interconnected. The second straight portion and a portion of the straight grounding segment are sequentially connected to form the second outer perimeter, and another portion of the straight grounding segment is sequentially connected to form the second inner perimeter. The distance between the second straight section and the adjacent straight grounding segment extending along the second direction in the second inner section is d2, and the thickness of the straight grounding segment and the second straight section is t2, 1.5≤d2 / t2≤6.

4. The antenna structure as described in claim 3, characterized in that, The thickness t1 of the first straight section is equal to the thickness t2 of the second straight section, and 4≤(d1+d2) / (t1+t2)≤6.

5. The antenna structure as described in claim 3, characterized in that, The distance between the linear power supply segment extending along the second direction in the first outer perimeter and the adjacent linear power supply segment extending along the second direction in the first inner perimeter is d3, and the thickness of the linear power supply segment is t3, where 1.5≤d3 / t3≤6.

6. The antenna structure as described in claim 3, characterized in that, The distance between the straight grounding segment extending along the second direction in the second outer perimeter and the adjacent straight grounding segment extending along the second direction in the second inner perimeter is d4, and the thickness of the straight grounding segment is t4, 1.5≤d4 / t4≤6.

7. The antenna structure as described in claim 1, characterized in that, The antenna structure further includes an extension arm, one end of which is electrically connected to the first straight section, and the other end of which extends toward the second straight section, so that the extension arm at least partially forms a coupling capacitor with the second straight section to achieve resonance in a second frequency band, wherein the first frequency band is different from the second frequency band.

8. The antenna structure as described in claim 7, characterized in that, The power supply arm also includes a first reverse bending portion, which connects the first straight portion and the first loop bending portion. The first reverse bending portion and the first loop bending portion are located on both sides of the axis of the first straight portion. The extended arm and the first reverse bend are located on the same side of the axis of the first straight section.

9. The antenna structure as described in claim 7, characterized in that, The grounding arm further includes a second reverse bend, which connects the second straight section and the second loop bend. The second reverse bend and the second loop bend are located on both sides of the axis of the second straight section, respectively. The extended arm and the second reverse bend are located on the same side of the axis of the second straight section.

10. An electronic device, characterized in that, The electronic device includes an antenna structure as described in any one of claims 1 to 9.

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