Directional diagram reconfigurable antenna based on bistable structure

Abstract

The invention discloses a directional diagram reconfigurable antenna based on a bistable structure in the field of antennas. The directional diagram reconfigurable antenna comprises a bistable bending structure and a dielectric substrate, a metal bottom plate is arranged on the upper surface of the dielectric substrate; a bistable bending structure is arranged above the metal bottom plate; a polygonal metal ring is arranged at the top of the bistable bending structure; a plurality of metal strips are arranged on the surface of the bistable bending structure; the metal strips are electrically connected with the polygonal metal ring to form a multi-arm helical antenna, a coaxial feed structure is arranged below the dielectric substrate, and a metal probe in the coaxial feed structure penetrates through the dielectric substrate and the metal bottom plate and then is electrically connected to the metal strips; the bistable bending structure has the characteristics of low cost, light weight, portability and high flexibility, and after the bistable bending structure changes the stable configuration, the antenna pattern is greatly reconstructed.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiating antennas, and in particular relates to a directional pattern reconfigurable antenna based on a bistable structure. Background Art

[0002] With the continuous upgrading of wireless communication systems, user diversity, and growing application demands, the fixed structure and operating frequency bands of traditional antennas can no longer meet the complex and ever-changing communication environments and requirements. To address this problem, reconfigurable antennas have emerged. By dynamically adjusting the antenna structure or parameters, they can reconfigure various characteristics, such as frequency, radiation pattern, and polarization, to adapt to different communication needs.

[0003] Currently, the technologies for implementing reconfigurable antennas are primarily categorized into two categories: electronic switching and mechanical deformation. Electronic switching offers the advantages of ease of integration and rapid response, but its reliance on electronic components can lead to stability issues and limited reconfiguration direction, reducing reliability during application. While mechanical deformation offers high reliability and a wide range of reconfiguration direction, it requires additional mechanical transmission devices and servo systems, increasing system complexity and manufacturing costs.

[0004] In summary, existing technologies struggle to achieve a balance between reliability, flexibility, and manufacturing costs, limiting their widespread adoption in practical applications. Therefore, optimizing the design of reconfigurable antennas to reduce complexity and cost while simultaneously improving flexibility and reliability has become a pressing technical challenge. Summary of the Invention

[0005] The purpose of the present invention is to provide a directional pattern reconfigurable antenna based on a bistable structure, which has the characteristics of low cost, light weight, portability and high flexibility, and realizes large-scale reconstruction of the antenna directional pattern.

[0006] To achieve the above objectives, the present invention provides, in a first aspect, a directional pattern reconfigurable antenna based on a bistable structure, comprising a bistable bent structure and a dielectric substrate; a metal base plate is provided on the upper surface of the dielectric substrate; a bistable bent structure is provided above the metal base plate; a polygonal metal ring is provided on the top of the bistable bent structure; A plurality of metal strips are provided on the surface of the bistable bending structure; each metal strip is electrically connected to the polygonal metal ring to form a multi-arm helical antenna; a coaxial feeding structure is provided below the dielectric substrate; a metal probe in the coaxial feeding structure passes through the dielectric substrate and the metal bottom plate and is electrically connected to the metal strips; when the bistable bending structure changes its stable configuration, the directional pattern of the multi-arm helical antenna is reconstructed.

[0007] Furthermore, the bistable bending structure is provided with a plurality of bendable surfaces, each of which includes an upper connecting portion, a lower connecting portion and a bending portion; the upper connecting portion and the lower connecting portion of each bendable surface are connected end to end; The bending portion includes an upper triangular plate and a lower triangular plate that can be bent, the upper triangular plate is connected to the upper connecting portion, and the lower triangular plate is connected to the lower connecting portion; the single side lengths of the upper triangular plate and the lower triangular plate overlap and are connected to each other, and the connection between the upper triangular plate and the lower triangular plate can be bent.

[0008] Furthermore, the upper triangular plate and the lower triangular plate have the same shape and size.

[0009] Furthermore, the bendable surface is arranged in a one-to-one correspondence with the side length of the polygonal metal ring.

[0010] Furthermore, the bendable surface and the metal strip are arranged in a one-to-one correspondence.

[0011] Furthermore, the bistable bending structure includes a first stable configuration and a second stable configuration; when the bistable bending structure changes from the first stable configuration to the second stable configuration, the polygonal metal ring is twisted ninety degrees counterclockwise; when the bistable bending structure changes from the second stable configuration to the first stable configuration, the polygonal metal ring is twisted ninety degrees clockwise.

[0012] Furthermore, the metal strip is arranged at an angle, and the lower half of the metal strip is attached to the lower triangular plate, and the upper half of the metal strip is attached to the upper triangular plate.

[0013] Furthermore, the coaxial feeding structure includes an outer conductor, an insulator and a metal probe; the insulator is sleeved outside the metal probe, the outer conductor is sleeved outside the insulator, and the outer conductor and the metal probe are coaxially arranged.

[0014] Furthermore, the metal bottom plate and the dielectric substrate are provided with through holes for the metal probe to pass through; the through holes are coaxially arranged with the metal probe.

[0015] Furthermore, the dielectric constant of the bistable bending structure is set to [2.0, 10.0]; the dielectric constant of the dielectric substrate is set to [2.0, 10.0]; the upper connecting portion, the lower connecting portion and the bending portion in the bistable bending structure all have a thickness of h1, and the value range of the thickness h1 is [0.001λ0, 0.01λ0]; the thickness h2 of the dielectric substrate is set to [0.002λ0, 0.02λ0], where λ0 is the free space wavelength.

[0016] Furthermore, a lateral distance S1 between the lower left vertex of the metal strip and the lower left vertex of the bendable surface is set to [0.01λ0, 0.03λ0]; a lateral distance S2 between the upper right vertex of the metal strip and the upper right vertex of the bendable surface is set to [0.01λ0, 0.03λ0]; The width W1 of the metal strip is set to [0.005λ0, 0.015λ0]; the width W2 of the polygonal metal ring is set to [0.005λ0, 0.015λ0], where λ0 is the free space wavelength.

[0017] Furthermore, the side length L1 of the metal base plate is set to [0.35λ0, 0.8λ0], the side length L2 of the bistable bending structure is set to [0.18λ0, 0.36λ0], the lateral spacing L3 between the bistable bending structure and the edge of the metal base plate is set to [0.13λ0, 0.26λ0], and the height H of the bistable bending structure is set to [0.3λ0, 0.8λ0], where λ0 is the free space wavelength.

[0018] A second aspect of the present invention provides a method for manufacturing a reconfigurable pattern antenna, comprising: The rectangular insulating sheet is bent, cut and bonded to form a bistable bent structure; Attaching a polygonal metal ring to the upper connecting portion, attaching a plurality of metal strips to the bending portions of each bendable surface, and connecting the polygonal metal rings to form a multi-arm helical antenna; Attaching a metal base plate to a dielectric substrate, and providing through holes in the dielectric substrate and the metal base plate; and fixing a bistable bending structure on the metal base plate; The metal probe in the coaxial feeding structure is passed through the through holes on the dielectric substrate and the metal bottom plate and connected to the metal strip.

[0019] Furthermore, the rectangular insulating sheet is bent, cut and bonded to form a bistable bent structure, specifically comprising: The bistable bending structure is provided with a plurality of bendable surfaces, each of which includes an upper connecting portion, a lower connecting portion, and a bending portion; the upper connecting portion and the lower connecting portion of each bendable surface are connected end to end; the bending portion is an upper triangular plate and a lower triangular plate that can be bent; Bending a rectangular insulating plate to form a plurality of bendable surfaces of the same size, wherein the bendable surfaces are arranged side by side; The unit surface is bent to form an upper connecting portion, a bending portion, and a lower connecting portion; the bending portion is cut to form an upper triangular plate and a lower triangular plate, wherein the upper triangular plate and the lower triangular plate have single side lengths that overlap and are connected to each other, and the connection between the upper triangular plate and the lower triangular plate can be bent; The bendable surfaces at both ends of the rectangular insulating plate are bonded together to form a bistable bending structure.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The bistable bending structure of the present invention is provided with a polygonal metal ring on the top; a plurality of metal strips are provided on the surface of the bistable bending structure; each metal strip is electrically connected to the polygonal metal ring to form a multi-arm helical antenna; a coaxial feeding structure is provided below the dielectric substrate; a metal probe in the coaxial feeding structure passes through the dielectric substrate and the metal bottom plate and is electrically connected to the metal strip; when the bistable bending structure changes its stable configuration, the directional pattern of the multi-arm helical antenna is reconstructed; the directional pattern reconstruction is achieved using the bistable structure without the need for complex electronic control equipment and a large number of feeding networks, thereby reducing the complexity and cost of the system; the design of the bistable structure ensures that the transition between the two stable configurations is stable and repeatable, and the state will not be easily changed due to external interference, thereby improving the reliability and stability of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A structural diagram of the first steady-state configuration of the directional pattern reconfigurable antenna provided in Example 1; Figure 2 A structural diagram of a second stable configuration of the directional pattern reconfigurable antenna provided in Example 1; Figure 3 A front view of the antenna with reconfigurable directivity pattern provided in Example 1; Figure 4 A top view of the directional pattern reconfigurable antenna provided in Example 1; Figure 5 An expanded view of the bistable bending structure provided in Example 1; Figure 6 A physical picture of the bistable bending structure provided in Example 1; Figure 7 |S11| curves of the directional pattern reconfigurable antenna provided in Example 1 in two steady-state configurations; Figure 8 The directional pattern of the reconfigurable antenna provided in Example 1 when it is in the first stable configuration at 1.44 GHz; Figure 9 The directional pattern of the reconfigurable antenna provided in Example 1 when it is in the second stable configuration at 1.44 GHz; Figure 10 A rectangular diagram of the normalized half-power beamwidth in the xz plane of the directional pattern reconfigurable antenna provided in Example 1 in a first stable configuration at 1.44 GHz and a second stable configuration at 1.14 GHz; Figure 11A rectangular diagram of the normalized half-power beamwidth in the yz plane of the directional pattern reconfigurable antenna provided in Example 1 in a first stable configuration at 1.44 GHz and a second stable configuration at 1.14 GHz; Figure 12 The axial ratio directional patterns of the directional pattern reconfigurable antenna provided in Example 1 in the first stable configuration and the second stable configuration; In the figure: 1 is a bistable bending structure, 11 is an upper connecting portion, 12 is a bending portion, 121 is an upper triangular plate, 122 is a lower triangular plate, 13 is a lower connecting portion, 2 is a metal strip, 3 is a polygonal metal ring, 4 is a dielectric substrate, 41 is a metal bottom plate, 42 is a through hole, 5 is a coaxial feeding structure, 51 is a metal probe, 52 is an insulating layer, and 53 is an outer conductor. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] It should be noted that, in the description of the present invention, the terms "front," "rear," "left," "right," "up," "down," "inside," and "outside" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and do not require that the present invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "front," "rear," "left," "right," "up," and "down" used in the description of the present invention refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] Example 1

[0025] like Figures 1 to 6 As shown, a directional pattern reconfigurable antenna based on a bistable structure includes a bistable bent structure 1 and a dielectric substrate 4; a metal base plate 41 is provided on the upper surface of the dielectric substrate 4; a through hole 42 for a metal probe to pass through is provided on the metal base plate 41 and the dielectric substrate 4; in this embodiment, the through hole 42 is coaxially arranged with the metal probe 51.

[0026] A bistable bending structure 1 is provided above the metal bottom plate 41; the bistable bending structure 1 has a plurality of bendable surfaces, each of which includes an upper connecting portion 11, a lower connecting portion 13, and a bending portion 12; the upper connecting portion 11 and the lower connecting portion 13 of each bendable surface are connected end to end; The bending portion 12 includes an upper triangular plate 121 and a lower triangular plate 122 that can be bent. In this embodiment, the upper triangular plate 121 and the lower triangular plate 122 have the same shape and size; the upper triangular plate 121 is connected to the upper connecting portion 11, and the lower triangular plate 122 is connected to the lower connecting portion 13; the single side lengths of the upper triangular plate 121 and the lower triangular plate 122 overlap and are connected to each other, and the connection between the upper triangular plate 121 and the lower triangular plate 122 can be bent.

[0027] A polygonal metal ring 3 is provided on the top of the bistable bending structure 1 ; the bendable surface is arranged in a one-to-one correspondence with the side length of the polygonal metal ring 3 .

[0028] The bistable bending structure 1 is provided with a plurality of metal strips 2 on its surface; the bendable surface is provided in a one-to-one correspondence with the metal strips 2. The metal strips 2 are arranged at an angle, with the lower half of the metal strips 2 attached to the lower triangular plate 122 and the upper half of the metal strips 2 attached to the upper triangular plate 121.

[0029] Each metal strip 2 is electrically connected to the polygonal metal ring 3 to form a multi-arm helical antenna. A coaxial feed structure 5 is disposed beneath the dielectric substrate 4. The coaxial feed structure 5 comprises an outer conductor 53, an insulator 52, and a metal probe 51. The insulator sleeve 52 is disposed outside the metal probe 51, and the outer conductor sleeve 53 is disposed outside the insulator sleeve 52. The outer conductor 53 and metal probe 51 are coaxially arranged. The metal probe 51 within the coaxial feed structure passes through the dielectric substrate 4 and the metal bottom plate 41, and is then electrically connected to the metal strip 2.

[0030] When the bistable folded structure 1 changes its stable configuration, the directional pattern of the multi-arm helical antenna is reconstructed. In this embodiment, the bistable folded structure 1 includes a first stable configuration and a second stable configuration. When the bistable folded structure 1 changes from the first stable configuration to the second stable configuration, the polygonal metal ring 3 twists 90 degrees counterclockwise. When the bistable folded structure 1 changes from the second stable configuration to the first stable configuration, the polygonal metal ring 3 twists 90 degrees clockwise. The design of the bistable structure in this embodiment ensures that the transition between the two stable positions is stable and repeatable, and the state will not be easily changed due to external interference, thereby improving the reliability and stability of the antenna.

[0031] The dielectric constant of the bistable bending structure 1 is set to [2.0, 10.0]; the dielectric constant of the dielectric substrate 4 is set to [2.0, 10.0]; the upper connecting portion, the lower connecting portion and the bending portion in the bistable bending structure all have a thickness h1, and the value range of the thickness h1 is [0.001λ0, 0.01λ0]; the thickness h2 of the dielectric substrate is set to [0.002λ0, 0.02λ0], where λ0 is the free space wavelength.

[0032] The lateral distance S1 between the lower left corner vertex of the metal strip 2 and the lower left corner vertex of the bendable surface is set to [0.01λ0, 0.03λ0]; the lateral distance S2 between the upper right corner vertex of the metal strip 2 and the upper right corner vertex of the bendable surface is set to [0.01λ0, 0.03λ0]; The width W1 of the metal strip 2 is set to [0.005λ0, 0.015λ0]; the width W2 of the polygonal metal ring 3 is set to [0.005λ0, 0.015λ0], where λ0 is the free space wavelength.

[0033] The side length L1 of the metal base plate 41 is set to [0.35λ0, 0.8λ0], the side length L2 of the bistable bending structure 1 is set to [0.18λ0, 0.36λ0], the lateral spacing L3 between the bistable bending structure 1 and the edge of the metal base plate 41 is set to [0.13λ0, 0.26λ0], and the height H of the bistable bending structure 1 is set to [0.3λ0, 0.8λ0], where λ0 is the free space wavelength.

[0034] In this embodiment, the specific parameters are set as follows: the thickness h1 of the bistable torsion origami structure is 0.5 mm; the thickness h2 of the dielectric substrate is 1 mm; the distance S1 between the lower left corner vertex of the metal strip and the lower left corner vertex of the surface of the bistable torsion origami structure is set to 5 mm; the distance S2 between the upper right corner vertex of the metal strip and the upper right corner vertex of the surface of the bistable torsion origami structure is set to 5 mm; the width W1 of the metal strip is 2.5 mm; and the width W2 of the metal ring strip is 2.5 mm.

[0035] The side length L1 of the square metal floor is 100 mm, the side length L2 of the bottom square of the bistable torsion origami structure is 40 mm, the distance L3 between the bistable torsion origami structure and the edge of the square metal floor is set to 30 mm, and the height H of the bistable torsion origami structure is 80 mm.

[0036] The diameter R1 of the circular hole etched on the metal floor is 3 mm, and the diameter of the metal probe used for feeding is 0.6 mm. The circular hole is concentric with the metal probe, and the center of the circle coincides with the midpoint of the bottom of the metal strip.

[0037] like Figures 7 to 12 As shown, with the help of electromagnetic simulation software, the radiation patterns of the bistable antenna in the first stable configuration and the second stable configuration can be calculated, and both exhibit normal radiation capabilities within the working frequency band and have good circular polarization characteristics.

[0038] Table 1. Comparison of antenna performance under two steady states.

[0039] In this embodiment, both the first and second stable-state configurations radiate in the positive z-axis direction. Rotating the antenna from the first to the second stable configuration changes the surface metal radiation strip structure, changes the 3dB beamwidth in both the xz and yz planes by 62°, and changes the matching gain by 2.88dBi. As shown in Table 1, the antenna pattern beamwidth is successfully reconfigurable, and good matching is achieved in all operating frequency bands.

[0040] In a multi-user environment, this embodiment's reconfigurable antenna can flexibly adjust its radiation pattern based on the location and needs of different users, achieving efficient coverage for multiple users and increasing the system's communication capacity. The bi-stable structure achieves pattern reconfiguration, eliminating the need for complex electronic control equipment and extensive feed networks, reducing system complexity and cost. The simple design makes the antenna easier to manufacture and maintain, reducing the risk of failure and maintenance costs associated with complex electronic components.

[0041] Example 2 This embodiment provides a method for manufacturing a reconfigurable pattern antenna. The method is used to manufacture the reconfigurable pattern antenna described in Example 1. The manufacturing method includes: The rectangular insulating sheet is bent, cut and bonded to form a bistable bending structure, specifically including: The rectangular insulating plate is a cardboard or plastic plate, and is bent to form a plurality of bendable surfaces of the same size, with each bendable surface being arranged side by side; The unit surface is bent to form an upper connecting portion 11, a bent portion 12, and a lower connecting portion 13; the bent portion 12 is cut to form an upper triangular plate 121 and a lower triangular plate 122, wherein the single side lengths of the upper triangular plate 121 and the lower triangular plate 122 overlap and are connected to each other, and the connection between the upper triangular plate 121 and the lower triangular plate 122 can be bent; Bonding the bendable surfaces at both ends of the rectangular insulating plate to form a bistable bending structure 1; Attach the polygonal metal ring 3 to the upper connecting portion 11; attach several metal strips 2 to the bending portions 12 of each bendable surface, and connect the polygonal metal ring 3 to form a multi-arm helical antenna; Attach the metal bottom plate 41 to the dielectric substrate 4, and open through holes 42 on the dielectric substrate 4 and the metal bottom plate 41; and fix the bistable bending structure 1 on the metal bottom plate 41; The metal probe 51 in the coaxial feeding structure 5 is passed through the through-hole 42 on the dielectric substrate and the metal bottom plate, and connected to the metal strip 2 .

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A directional pattern reconfigurable antenna based on a bistable structure, characterized in that: It includes a bistable bending structure and a dielectric substrate; a metal bottom plate is provided on the upper surface of the dielectric substrate; a bistable bending structure is provided above the metal bottom plate; a polygonal metal ring is provided on the top of the bistable bending structure; A plurality of metal strips are provided on the surface of the bistable bending structure; each metal strip is electrically connected to the polygonal metal ring to form a multi-arm helical antenna; a coaxial feeding structure is provided below the dielectric substrate; a metal probe in the coaxial feeding structure passes through the dielectric substrate and the metal bottom plate and is electrically connected to the metal strips; when the bistable bending structure changes its stable configuration, the directional pattern of the multi-arm helical antenna is reconstructed.

2. The reconfigurable pattern antenna according to claim 1, wherein: The bistable bending structure is provided with a plurality of bendable surfaces, each of which includes an upper connecting portion, a lower connecting portion and a bending portion; the upper connecting portion and the lower connecting portion of each bendable surface are connected end to end; The bending portion includes an upper triangular plate and a lower triangular plate that can be bent, the upper triangular plate is connected to the upper connecting portion, and the lower triangular plate is connected to the lower connecting portion; the single side lengths of the upper triangular plate and the lower triangular plate overlap and are connected to each other, and the connection between the upper triangular plate and the lower triangular plate can be bent.

3. The reconfigurable pattern antenna according to claim 2, wherein: The bendable surface is arranged in a one-to-one correspondence with the side length of the polygonal metal ring; the bendable surface is arranged in a one-to-one correspondence with the metal strip.

4. The reconfigurable pattern antenna according to claim 1, wherein: The bistable bending structure includes a first stable configuration and a second stable configuration; when the bistable bending structure changes from the first stable configuration to the second stable configuration, the polygonal metal ring is twisted ninety degrees counterclockwise; when the bistable bending structure changes from the second stable configuration to the first stable configuration, the polygonal metal ring is twisted ninety degrees clockwise.

5. The reconfigurable pattern antenna according to claim 2, wherein: The metal strip is arranged obliquely, and the lower half of the metal strip is attached to the lower triangular plate, and the upper half of the metal strip is attached to the upper triangular plate.

6. The reconfigurable pattern antenna according to claim 2, wherein: The dielectric constant of the bistable bending structure is set to [2.0, 10.0]; the dielectric constant of the dielectric substrate is set to [2.0, 10.0]; the upper connecting portion, the lower connecting portion and the bending portion in the bistable bending structure all have a thickness h1, and the value range of the thickness h1 is [0.001λ0, 0.01λ0]; the thickness h2 of the dielectric substrate is set to [0.002λ0, 0.02λ0], where λ0 is the free space wavelength.

7. The reconfigurable pattern antenna according to claim 2, wherein: The lateral distance S1 between the lower left corner vertex of the metal strip and the lower left corner vertex of the bendable surface is set to [0.01λ0, 0.03λ0]; the lateral distance S2 between the upper right corner vertex of the metal strip and the upper right corner vertex of the bendable surface is set to [0.01λ0, 0.03λ0]; The width W1 of the metal strip is set to [0.005λ0, 0.015λ0]; the width W2 of the polygonal metal ring is set to [0.005λ0, 0.015λ0], where λ0 is the free space wavelength.

8. The reconfigurable pattern antenna according to claim 2, wherein: The side length L1 of the metal base plate is set to [0.35λ0, 0.8λ0], the side length L2 of the polygonal metal ring is set to [0.18λ0, 0.36λ0], the lateral spacing L3 between the bistable bending structure and the edge of the metal base plate is set to [0.13λ0, 0.26λ0], and the height H of the bistable bending structure is set to [0.3λ0, 0.8λ0], where λ0 is the free space wavelength.

9. The method for manufacturing a reconfigurable pattern antenna according to any one of claims 1 to 8, characterized in that: include: The rectangular insulating sheet is bent, cut and bonded to form a bistable bent structure; Attaching a polygonal metal ring to the upper connecting portion, attaching a plurality of metal strips to the bending portions of each bendable surface, and connecting the polygonal metal rings to form a multi-arm helical antenna; Attaching a metal base plate to a dielectric substrate, and providing through holes in the dielectric substrate and the metal base plate; and fixing a bistable bending structure on the metal base plate; The metal probe in the coaxial feeding structure is passed through the through holes on the dielectric substrate and the metal bottom plate and connected to the metal strip.

10. The method for manufacturing a reconfigurable pattern antenna according to claim 9, wherein: The rectangular insulating sheet is bent, cut and bonded to form a bistable bending structure, specifically including: The bistable bending structure is provided with a plurality of bendable surfaces, each of which includes an upper connecting portion, a lower connecting portion, and a bending portion; the upper connecting portion and the lower connecting portion of each bendable surface are connected end to end; the bending portion is an upper triangular plate and a lower triangular plate that can be bent; Bending a rectangular insulating plate to form a plurality of bendable surfaces of the same size, wherein the bendable surfaces are arranged side by side; The unit surface is bent to form an upper connecting portion, a bending portion, and a lower connecting portion; the bending portion is cut to form an upper triangular plate and a lower triangular plate, wherein the upper triangular plate and the lower triangular plate have single side lengths that overlap and are connected to each other, and the connection between the upper triangular plate and the lower triangular plate can be bent; The bendable surfaces at both ends of the rectangular insulating plate are bonded together to form a bistable bending structure.

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