Antenna structure and preparation method

Abstract

The present application relates to an antenna structure and a preparation method, the antenna structure includes a coupled first radiation unit and a second radiation unit, the first radiation unit includes a first radiation part arranged vertically and extending along a first direction, a first groove is formed on the first radiation part, the second radiation unit includes a second radiation part arranged vertically and formed with a second groove, the second radiation part and the first radiation part are arranged side by side and spaced in a second direction, the second direction intersects the first direction, the upper area of ​​the first radiation part and the upper area of ​​the second radiation part are bent toward each other to form a bending part, the first radiation unit and the second radiation unit are staggered in the first direction, so that the first groove and the second groove are staggered, and the bending part of the first radiation unit is staggered with the bending part of the second radiation unit. The antenna structure is optimized so that the antenna can achieve 360-degree omnidirectional signal reception; and the existence of the bending part reduces the volume of the antenna structure.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an antenna structure and a preparation method thereof. Background Art

[0002] With the rapid development of wireless communication technology, antennas, as one of the key components in communication systems, have increasingly higher requirements for performance and appearance.

[0003] Although traditional antennas have good conductivity and radiation performance, there is usually signal interference in a certain direction on the antenna. When there is signal interference on the antenna, a concave shape will be generated on the antenna's radiation pattern, that is, the antenna cannot receive signals in 360° all-directional directions. Summary of the invention

[0004] Based on this, it is necessary to provide an antenna structure for 360° omnidirectional signal reception.

[0005] The present application provides an antenna structure, including a first radiating unit and a second radiating unit coupled with each other, the first radiating unit including a first radiating portion arranged vertically and extending along a first direction, a first groove formed on the first radiating portion, the second radiating unit including a second radiating portion arranged vertically and formed with a second groove, the second radiating portion and the first radiating portion are arranged side by side and spaced apart in a second direction, the second direction intersects with the first direction, an upper region of the first radiating portion and an upper region of the second radiating portion are bent toward each other to form a bending portion, the first radiating unit and the second radiating unit are staggered in the first direction, so that the first groove and the second groove are staggered in arrangement, and the bending portion of the first radiating unit is staggered in arrangement with the bending portion of the second radiating unit.

[0006] In one embodiment, the bending portion on the first radiation unit is defined as a first bending portion, and the bending portion on the second radiation unit is defined as a second bending portion. The portion of the first radiation portion adjacent to the first bending portion is perpendicular to the first bending portion, and the portion of the second radiation portion adjacent to the second bending portion is perpendicular to the second bending portion.

[0007] In one embodiment, the first radiation unit and the second radiation unit have different lengths.

[0008] In one embodiment, both the first radiation portion and the second radiation portion have a transparent metal mesh structure.

[0009] In one embodiment, the first radiation unit and the second radiation unit are both made of a mixture of one or more nano-conductive materials, the thickness of the nano-conductive material is 500nm~5μm, the square resistance is 0.01Ω~100Ω, and the nano-conductive material includes nano-metal powder, and the diameter of the nano-metal powder is 30nm~55nm.

[0010] In one embodiment, the antenna structure also includes a feeding end electrically connected to both the first radiating portion and the second radiating portion, the first radiating unit includes a first grounding end electrically connected to the first radiating portion, and the second radiating unit includes a second grounding end electrically connected to the second radiating portion.

[0011] In one embodiment, the feeding end is located on the first end of the first radiating portion, the second end of the first radiating portion extends downward to form a first radiating segment, the first radiating segment extends along the first direction toward the feeding end to form a second radiating segment, and the first grounding end is arranged at the end of the second radiating segment.

[0012] In one embodiment, the first radiating portion is wavy and is formed by connecting arch segments and connecting segments alternately arranged along the first direction end to end in sequence, the arch segments are in an inverted U shape, and the arch segments define the first groove, and the fold formed on the first radiating unit is defined as a first fold, and the first fold is located below the top edge of the first groove and extends along the first direction.

[0013] In one embodiment, the second radiating portion extends along the first direction, the second radiating unit also includes a first part and a second part, the first end of the second radiating portion extends downward to form the first part, the second part includes an extension section extending along the first direction, and one end of the extension section is connected to the lower end of the first part.

[0014] In one embodiment, the second radiation portion includes a wave segment in a wave shape, the wave segment is formed by U-shaped segments and transition segments that are alternately arranged along the first direction and connected end to end in sequence, the second groove is defined between two adjacent U-shaped segments and the transition segment, the fold formed on the second radiation unit is defined as a second fold, the second fold is located below the transition segment, and extends along the first direction;

[0015] Alternatively, the second radiating portion includes an extension portion extending along the first direction and a convex portion extending downward from the bottom of the extension portion, the second groove extends along the up-down direction, and a portion of the second groove is located on the extension portion, and another portion of the second groove is located on the convex portion, and a fold formed on the second radiating unit is defined as a second fold, and the second fold is located below the bottom edge of the extension portion and extends along the first direction.

[0016] The present application also provides a method for preparing an antenna structure, wherein the antenna structure is the antenna structure described in any one of the above embodiments, and a first radiation unit, a second radiation unit and a 3D printing material filling area are prepared by micro-nano 3D stacking technology, and the first radiation unit, the second radiation unit and the 3D printing material filling area are combined together.

[0017] Compared with the prior art, in the antenna structure provided by the present application, the first radiation unit and the second radiation unit are arranged side by side and staggered. At this time, the bending portion of the first radiation unit and the bending portion of the second radiation unit are staggered, and the first groove and the second groove are staggered. This will cause the resonant frequencies of the first radiation unit and the second radiation unit to be staggered. The resonant mode generated by the first radiation unit and the mode generated by the second radiation unit are staggered and superimposed, and will compensate for the concave part on the antenna pattern, thereby reducing interference to reduce the degree of concave on the antenna pattern of the antenna structure, that is, the antenna structure is optimized so that the antenna can achieve 360-degree omnidirectional signal reception; and the presence of the bending portion reduces the volume of the antenna structure, thereby achieving the purpose of miniaturization of the antenna structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A three-dimensional diagram of an antenna structure according to an embodiment of the present application;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure in which the first radiation unit and the second radiation unit cooperate;

[0021] Figure 3 for Figure 2 A schematic diagram of the structure of the first radiation unit before being bent;

[0022] Figure 4 for Figure 2A schematic structural diagram of the first radiation unit in FIG.

[0023] Figure 5 for Figure 2 A schematic structural diagram of the second radiation unit in FIG.

[0024] Figure 6 This is a schematic structural diagram of a second radiation unit before being bent according to an embodiment of the present application;

[0025] Figure 7 is the antenna pattern of the first radiating unit in different frequency bands (the data in the circumferential direction are distributed in sequence at intervals of 30°);

[0026] Figure 8 It is the antenna radiation pattern of the antenna structure in different frequency bands (the data in the circumferential direction are distributed in sequence at intervals of 30°).

[0027] Figure numerals: 1. first radiation unit; 11. first radiation part; 111. arched section; 1111. first groove; 112. connecting section; 113. first bending part; 1131. first fold; 114. feeding end; 12. first radiation section; 13. second radiation section; 14. first grounding end; 2. second radiation unit; 21. second radiation part; 210. second bending part; 2101. second fold; 211. wave section; 2111. U-shaped section; 2112. transition section; 213. second groove; 214. extension section; 215. convex section; 22. first part; 23. second part; 231. extension section; 232. arched section; 2321. third groove; 233. second grounding end; 3. first bending line; 4. second bending line; 5. 3D printing material filling area. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", "side", "top", "bottom" and similar expressions used in the specification of this application are only used to describe the various example structural parts and elements of the present application, but these terms are used here only for the purpose of convenience of explanation, and are determined based on the example orientations shown in the accompanying drawings, and do not represent the only implementation method. Since the embodiments disclosed in the application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may form an angle with the axial direction.

[0033] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0034] like Figure 1 to Figure 8As shown, the present application discloses an antenna structure. The antenna structure includes a first radiation unit 1 and a second radiation unit 2 coupled with each other. The first radiation unit 1 includes a first radiation portion 11 arranged vertically and extending along a first direction B, and a first groove 1111 is formed on the first radiation portion 11. The second radiation unit 2 includes a second radiation portion 21 arranged vertically, and a second groove 213 is formed on the second radiation portion 21, and the second radiation portion 21 is arranged side by side and spaced apart with the first radiation portion 11 in the second direction A, and the upper area of ​​the first radiation portion 11 and the upper area of ​​the second radiation portion 21 are bent toward each other to form a bending portion, and the first radiation unit 1 and the second radiation unit 2 are staggered in the first direction B, so that the first groove 1111 and the second groove 213 are staggered, and the bending portion of the first radiation unit 1 is staggered with the bending portion of the second radiation unit 2. The above-mentioned second direction A intersects with the first direction B. In this embodiment, the second direction A is perpendicular to the first direction B.

[0035] It can be understood that the first radiation unit 1 and the second radiation unit 2 are arranged side by side and staggered. At this time, the bending portion of the first radiation unit 1 and the bending portion of the second radiation unit 2 are staggered, and the first groove and the second groove are staggered. This will cause the resonant frequencies of the first radiation unit 1 and the second radiation unit 2 to be staggered. The resonant mode generated by the first radiation unit 1 and the mode generated by the second radiation unit 2 are staggered and superimposed, which will compensate for the concave part on the antenna pattern, thereby reducing interference to reduce the degree of concave on the antenna pattern of the antenna structure. For details, see Figure 8 As shown, the antenna structure is optimized so that the antenna can achieve 360-degree omnidirectional signal reception. The existence of the bent portion reduces the volume of the antenna structure, achieving the purpose of miniaturization of the antenna structure.

[0036] Depend on Figure 7 It can be seen that the antenna pattern formed by the first radiating unit in different frequency bands (such as 2400MHz, 2450MHz, etc.) has obvious depressions. Figure 8 It can be seen that, through the coupling of the first radiation unit and the second radiation unit, the degree of depression is significantly improved, the antenna structure is well optimized, and the antenna structure can achieve 360-degree omnidirectional signal reception.

[0037] like Figure 2As shown, the length of the first radiation unit 1 is different from the length of the second radiation unit 2. Then, the resonant frequency of the first radiation unit 1 is different from the resonant frequency of the second radiation unit 2. Since the first radiation unit 1 and the second radiation unit 2 are arranged in a staggered manner, the resonant frequency of the first radiation unit 1 and the resonant frequency of the second radiation unit 2 are staggered, so that the antenna structure formed can achieve the purpose of expanding the resonant bandwidth and improving the coverage frequency band of the antenna structure, such as covering the frequency band in the range of 800MHz to 2000MHz. The bandwidth can also be adjusted by adjusting the spacing between the first radiation unit 1 and the second radiation unit 2. In this embodiment, the spacing between the first radiation unit 1 and the second radiation unit 2 is not less than 2mm.

[0038] In one embodiment, the bending portion on the first radiation unit 1 is defined as the first bending portion 113, and the bending portion on the second radiation unit 2 is defined as the second bending portion 210. Figure 2 and Figure 4 As shown, the portion of the first radiating portion 11 adjacent to the first bending portion 113 is perpendicular to the first bending portion 113, that is, the first bending portion 113 is bent at a right angle. The portion of the second radiating portion 21 adjacent to the second bending portion 210 is perpendicular to the second bending portion 210, that is, the second bending portion 210 is bent at a right angle. In addition, a circular arc bending method can also be used.

[0039] like Figure 1~Figure 3 As shown, the above-mentioned antenna structure also includes a feeding end 114 electrically connected to both the first radiating portion 11 and the second radiating portion 21, the first radiating unit 1 includes a first grounding end 14 electrically connected to the first radiating portion 11, and the second radiating unit 2 includes a second grounding end 233 electrically connected to the second radiating portion 21.

[0040] In one embodiment, the feed end 114 is disposed on the second radiation unit 2. Figure 4 As shown, the feed end 114 is arranged on the first radiation unit 1, and the first ground end 14 is arranged on the same side as the feed end 114. Specifically, the feed end 114 is located on the first end of the first radiation portion 11, the second end of the first radiation portion 11 extends downward to form a first radiation section 12, the first radiation section 12 extends along the first direction B toward the feed end 114 to form a second radiation section 13, and the first ground end 14 is arranged at the end of the second radiation section 13.

[0041] like Figure 2 and Figure 4As shown, the current signal is fed from the feeding end 114 and flows through the first radiation unit 1, and the first radiation unit 1 generates a resonant mode. Due to the coupling between the first radiation unit 1 and the second radiation unit 2, other resonant modes are generated. The resonant mode of the first radiation unit 1 and the resonant mode of the second radiation unit 2 are misaligned and superimposed to compensate for the concave part on the antenna radiation pattern of the antenna structure. For details, see Figure 8 As shown, the degree of depression on the antenna pattern of the antenna structure is reduced.

[0042] In one embodiment, if Figure 3 and Figure 4 As shown, the first radiation portion 11 is wavy and is formed by connecting the arch segments 111 and the connecting segments 112 alternately arranged along the first direction B in sequence. In one embodiment, there is one arch segment 111, or two or more arch segments 111. In this embodiment, there are 6 arch segments. The arch segment 111 is in an inverted U shape, and the arch segment 111 defines a first groove 1111. The fold formed on the first radiation unit 1 is defined as a first fold 1131. The first fold 1131 is located below the top edge of the first groove 1111 and extends along the first direction B. Figure 3 As shown, the first radiation portion 11 is marked with a first bending line 3 for subsequent bending to form a first bending portion 113 , and the first bending line 3 is the first fold 1131 .

[0043] In another embodiment, the first radiation segment 12 includes a first segment extending along the first direction B and a convex segment extending downward from the bottom edge of the first segment, a portion of the first groove 1111 is located on the first segment, and another portion of the first groove 1111 is located on the convex segment.

[0044] In one embodiment, if Figure 5 and Figure 6 As shown, the second radiating portion 21 extends along the first direction B, and the second radiating unit 2 further includes a first portion 22 and a second portion 23. The first end of the second radiating portion 21 extends downward to form the first portion 22, and the second portion 23 includes an extension segment 231 extending along the first direction B, and one end of the extension segment 231 is connected to the lower end of the first portion 22.

[0045] In one embodiment, the second portion 23 only includes the extension section 231, and the second grounding terminal 233 is disposed on the extension section 231. Figure 5 As shown, the second portion 23 further includes an inverted U-shaped arched section 232. The arched section 232 is located between the extension section 231 and the first portion 22, and the two ends of the arched section 232 are connected to the lower ends of the extension section 231 and the first portion 22 respectively.

[0046] In another embodiment, Figure 6As shown, one end of the extension section 231 is directly connected to the lower end of the first part 22, the second end of the extension section 231 is connected to the first end of the arch section 232, a third groove 2321 is defined in the arch section 232, and the second grounding end 233 is connected to the second end of the arch section 232.

[0047] The fold formed on the second radiation unit 2 is defined as the second fold 2101. Figure 5 and Figure 6 As shown, the second radiation portion 21 is marked with a second bending line 4 for subsequent bending to form a second bending portion 210 , and the second bending line 4 is the second fold 2101 .

[0048] One of the design forms of the second radiation portion 21 is as follows: Figure 5 As shown, the second radiation portion 21 includes a wave-shaped wave section 211, and the wave section 211 is formed by U-shaped sections 2111 and transition sections 2112 that are alternately arranged along the first direction B and connected end to end in sequence. There are two or more U-shaped sections 2111. In this embodiment, there are two U-shaped sections 2111. A second groove 213 is defined between two adjacent U-shaped sections 2111 and transition sections 2112, and the second fold 2101 is located below the transition section 2112 and extends along the first direction B.

[0049] The second design form of the second radiation portion 21 is as follows: Figure 6 As shown, the second radiation portion 21 includes an extension portion 214 extending along the first direction B and a convex portion 215 extending downward from the bottom of the extension portion 214, the second groove 213 extends along the up-down direction, and a portion of the second groove 213 is located on the extension portion 214, and another portion of the second groove 213 is located on the convex portion 215, and the second fold 2101 is located below the bottom edge of the extension portion 214 and extends along the first direction B. In this embodiment, there are one, two or more convex portions 215. Each convex portion 215 corresponds to one second groove 213.

[0050] It can be understood that the positions of the first bending line 3 and the second bending line 4 can be adjusted according to the frequency band and usage scenario of the required antenna to adjust the bending position, and the spacing between the first radiation unit 1 and the second radiation unit 2 can be adjusted, so as to achieve 360° omnidirectional signal reception while achieving the purpose of expanding the broadband.

[0051] In one embodiment, the first radiation part 11 and the second radiation part 21 both have a transparent metal mesh structure. It is understandable that such a design enables the antenna structure to have certain conductivity and radiation functions while having high transparency, and can be used externally on large equipment. And the antenna works without affecting the visual effect of the device.

[0052] In one embodiment, the first radiation unit 1 and the second radiation unit 2 are both made of a mixture of one or more nano-conductive materials, the thickness of the nano-conductive material is 500nm~5μm, the square resistance is 0.01Ω~100Ω, and the diameter of the nano-metal powder is 30nm~55nm. The design of any value within the aforementioned range can ensure the transmittance of the first radiation unit and the second radiation unit.

[0053] In this embodiment, the nano-conductive material is indium tin oxide (ITO), fluorine-doped tin oxide (FTO) or silver-plated polymer (AgHT) film, that is, the first radiation unit 1 and the second radiation unit 2 are both formed by a mixture of one or more of indium tin oxide (ITO), fluorine-doped tin oxide (FTO) and silver-plated polymer (AgHT) films.

[0054] The conductive material is made of the following raw materials: nano metal powder, polar solvent, adhesive, dispersant, active agent, corrosion resistant agent, curing agent. Among them, the polar solvent is at least one of methanol, propylene glycol or ethylene glycol. The active agent is one or more of carboxylate, sulfate, sulfonate and phosphate surfactants. The adhesive is polyamide resin. The dispersant is sodium carboxymethyl cellulose (CMC).

[0055] The present application provides a method for preparing the above-mentioned conductive material, and other preparation methods may also be used. In this embodiment, the method for preparing the conductive material includes the following steps in sequence:

[0056] S1. Place the diluent in a container and then heat it to 45°C to 80°C;

[0057] S2, placing nano metal powder (such as nano silver powder) in a container, and stirring with a stirrer to make the mixture in the container evenly mixed;

[0058] S3, adding the active agent into the container and stirring for 30min~60min;

[0059] S4, adding a dispersant and stirring with a magnetic stirrer for 10 min to 25 min to improve the dispersibility and stability of the nano metal powder and ensure that the particles will not aggregate and settle;

[0060] S5. Add adhesive and stir for 40 to 55 minutes;

[0061] S6. Then, a corrosion-resistant agent and a curing agent are added to the container in sequence, and the mixture is stirred for 1 hour to obtain a conductive paste;

[0062] S7. Put the prepared conductive slurry into a storage tank for sealed storage.

[0063] The preparation method of the above antenna structure is to prepare the first radiation unit 1, the second radiation unit 2 and the 3D printing material filling area 5 by micro-nano 3D stacking technology, and combine the first radiation unit 1, the second radiation unit 2 and the 3D printing material filling area 5 together, see Figure 1 The above-mentioned preparation method enables the first radiation unit 1 and the second radiation unit 2 to be closely combined together.

[0064] The above 3D printing material is a transparent 3D printing medium material, such as acrylic.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An antenna structure, characterized in that: The invention comprises a first radiation unit (1) and a second radiation unit (2) coupled to each other, wherein the first radiation unit (1) comprises a first radiation portion (11) arranged vertically and extending along a first direction (B), a first groove (1111) being formed on the first radiation portion (11), and the second radiation unit (2) comprises a second radiation portion (21) arranged vertically and formed with a second groove (213), the second radiation portion (21) and the first radiation portion (11) being arranged side by side and spaced apart in a second direction (A), the second direction (A) intersecting the first direction (B), the upper region of the first radiation portion (11) and the upper region of the second radiation portion (21) being bent towards each other to form a bent portion, the first radiation unit (1) and the second radiation unit (2) being staggered in the first direction (B), so that the first groove (1111) and the second groove (213) are staggered in arrangement, and the bent portion of the first radiation unit (1) and the bent portion of the second radiation unit (2) are staggered in arrangement.

2. The antenna structure according to claim 1, characterized in that: The bending portion on the first radiation unit (1) is defined as a first bending portion (113), and the bending portion on the second radiation unit (2) is defined as a second bending portion (210). The portion of the first radiation portion (11) adjacent to the first bending portion (113) is perpendicular to the first bending portion (113), and the portion of the second radiation portion (21) adjacent to the second bending portion (210) is perpendicular to the second bending portion (210).

3. The antenna structure according to claim 1, characterized in that: The first radiation unit (1) and the second radiation unit (2) have different lengths.

4. The antenna structure according to claim 1, characterized in that: The first radiation portion (11) and the second radiation portion (21) both have a transparent metal grid structure.

5. The antenna structure according to claim 1, characterized in that: The first radiation unit (1) and the second radiation unit (2) are both made of a mixture of one or more nano-conductive materials, the thickness of the nano-conductive material is 500nm~5μm, and the square resistance is 0.01Ω~100Ω. The nano-conductive material includes nano-metal powder, and the diameter of the nano-metal powder is 30nm~55nm.

6. The antenna structure according to any one of claims 1 to 5, characterized in that: The antenna structure also includes a feeding end (114) electrically connected to both the first radiating portion (11) and the second radiating portion (21); the first radiating unit (1) includes a first grounding end (14) electrically connected to the first radiating portion (11); and the second radiating unit (2) includes a second grounding end (233) electrically connected to the second radiating portion (21).

7. The antenna structure according to claim 6, characterized in that: The feeding end (114) is located on the first end of the first radiating portion (11); the second end of the first radiating portion (11) extends downward to form a first radiating section (12); the first radiating section (12) extends along the first direction (B) toward the feeding end (114) to form a second radiating section (13); and the first grounding end (14) is arranged at the end of the second radiating section (13).

8. The antenna structure according to claim 7, characterized in that: The first radiation portion (11) is wavy and is formed by connecting arch segments (111) and connecting segments (112) alternately arranged along the first direction (B) end to end in sequence; the arch segments (111) are in an inverted U shape, and the arch segments (111) define the first groove (1111); a fold formed on the first radiation unit (1) is defined as a first fold (1131); the first fold (1131) is located below the top edge of the first groove (1111) and extends along the first direction (B).

9. The antenna structure according to claim 7, characterized in that: The second radiating portion (21) extends along the first direction (B), and the second radiating unit (2) further comprises a first part (22) and a second part (23), wherein the first end of the second radiating portion (21) extends downward to form the first part (22), and the second part (23) comprises an extension section (231) extending along the first direction (B), and one end of the extension section (231) is connected to the lower end of the first part (22).

10. The antenna structure according to claim 9, characterized in that: The second radiation portion (21) comprises a wave-shaped wave segment (211), the wave segment (211) being formed by U-shaped segments (2111) and transition segments (2112) being alternately arranged along the first direction (B) and connected end to end in sequence, the second groove (213) being defined between two adjacent U-shaped segments (2111) and the transition segments (2112), the fold formed on the second radiation unit (2) being defined as a second fold (2101), the second fold (2101) being located below the transition segment (2112) and extending along the first direction (B); Alternatively, the second radiating portion (21) includes an extension portion (214) extending along the first direction (B) and a convex portion (215) extending downward from the bottom of the extension portion, the second groove (213) extends along the up-down direction, and a portion of the second groove (213) is located on the extension portion (214), and another portion of the second groove (213) is located on the convex portion (215), and the fold formed on the second radiating unit (2) is defined as a second fold (2101), and the second fold (2101) is located below the bottom edge of the extension portion (214) and extends along the first direction (B).

11. A method for preparing an antenna structure, characterized in that: The antenna structure is the antenna structure described in any one of claims 1 to 10, wherein a first radiation unit (1), a second radiation unit (2) and a 3D printing material filling area (5) are prepared by micro-nano 3D stacking technology, and the first radiation unit (1), the second radiation unit (2) and the 3D printing material filling area (5) are combined together.

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