Ultra-thin broadband rolled wave-absorbing structure

Abstract

The present invention provides an ultra-thin broadband roll-type absorbing structure, comprising: a backplane and a Fabry-Perot resonator group; one end of the backplane is set as the wave-facing side, and the other end is set as the wave-backing side. One or more groups of the Fabry-Perot resonator groups are connected to the side surface between the wave-facing side and the wave-backing side of the backplane. Each group of the Fabry-Perot resonator groups is formed by laminating a plurality of Fabry-Perot resonator units in the form of an onion roll, and a gap is provided between adjacent Fabry-Perot resonator units. The form of the onion roll is set such that one ends of the plurality of Fabry-Perot resonator units are laminated and connected to the side surface of the backplane along the direction from the wave-facing side to the wave-backing side, and the other ends of the plurality of Fabry-Perot resonator units are bent to the plane where the wave-facing side of the backplane is located and are arranged layer by layer along the direction away from the backplane. The roll-type absorbing structure provided by the present invention places the backplane providing the total reflection function inside, which is significantly different from the existing absorbing structures that place the backplane on the wave-backing side, and can avoid the resulting increase in thickness.

Description

Technical Field

[0001] The present invention relates to the technical field of wave absorption, and more specifically, to an ultra-thin broadband roll-type wave absorption structure. Background Art

[0002] Electromagnetic waves and mechanical waves are important carriers for energy and information transmission. The effective regulation of electromagnetic waves and mechanical waves plays a decisive role in application fields such as energy harvesting, detection, and communication. Efficient absorption of electromagnetic waves and mechanical waves is extremely crucial for enhancing energy harvesting efficiency, improving detection accuracy, and increasing communication rate. Low-frequency electromagnetic waves and mechanical waves with long wavelengths have obvious diffraction effects, and extremely thick traditional wave-absorbing materials (such as the foam wedges used in microwave anechoic chambers and acoustic muffler chambers) are required to achieve a relatively high absorption coefficient, which brings a huge cost in terms of space occupation and severely limits the breadth of application scenarios of traditional wave-absorbing materials.

[0003] In recent years, based on the structural design concept of metamaterials, a variety of novel metamaterial wave absorption structures have been developed. However, limited by the resonance working mechanism of such wave absorption structures, most metamaterial wave absorption structures can only exhibit wave absorption performance superior to traditional wave-absorbing materials within a certain narrow frequency band. In order to achieve a near-perfect (absorption coefficient close to 1) wave absorption effect in a broadband, Patent CN114389051A discloses a grid electromagnetic wave absorption structure stacked by gradient-distributed carbon fiber strips, which can effectively excite the surface plasmon propagation mode for electromagnetic waves with different incident frequencies, thereby realizing broadband electromagnetic wave absorption through the ohmic loss of carbon fibers; Patent CN114023293A embeds several layers of circular scatterers with equal thickness and increasing diameter at equal intervals from bottom to top in an elastic column, and utilizes the resonance coupling between the elastic column and different scatterers as well as the blocking of the steel back lining to significantly expand the acoustic wave absorption bandwidth; Patent CN 113808560A proposes an underwater sound absorber with multiple Fabry–Pérot resonators of different lengths arranged horizontally in the in-plane direction. By continuously arranging the resonance absorption peaks of different Fabry–Pérot resonators, a near-perfect wave absorption effect in a broadband is achieved.

[0004] For the wave absorption structures disclosed in the above-mentioned existing patents, the back lining providing the total reflection function is placed on the back wave side, which will undoubtedly increase the overall thickness of the wave absorption structure. In addition, gradually arranging scatterers with different shapes in the out-of-plane vertical direction (the direction perpendicular to the plane where the wave-incident side is located) will bring difficulties to production and preparation, while the form of arranging Fabry–Pérot resonators with different lengths in the in-plane horizontal direction (the direction parallel to the plane where the wave-incident side is located) will cause one end face of the wave absorption structure to be uneven, affecting installation and construction. Summary of the Invention

[0005] Aiming at the defects in the prior art, the object of the present invention is to provide an ultra-thin broadband roll-type wave absorption structure.

[0006] According to the ultra-thin broadband roll-type wave-absorbing structure provided by the present invention, it includes: a back lining and a Fabry-Perot resonator group;

[0007] One end of the back lining is set as the wave-facing side, and the other end is set as the wave-backing side. A group or multiple groups of the Fabry-Perot resonator groups are connected to the side surface between the wave-facing side and the wave-backing side of the back lining. Each group of the Fabry-Perot resonator groups is stacked in the form of an onion roll by multiple Fabry-Perot resonator units, and a gap is provided between adjacent Fabry-Perot resonator units.

[0008] The form of the onion roll is set such that one end of multiple Fabry-Perot resonator units is stacked and connected to the side surface of the back lining along the direction from the wave-facing side to the wave-backing side, and the other ends of multiple Fabry-Perot resonator units are bent to the plane where the wave-facing side of the back lining is located and are arranged layer by layer along the direction away from the back lining.

[0009] Preferably, the Fabry-Perot resonator group includes: a left Fabry-Perot resonator and a right Fabry-Perot resonator;

[0010] The left Fabry-Perot resonator and the right Fabry-Perot resonator are respectively connected to both sides of the side surface between the wave-facing side and the wave-backing side of the back lining.

[0011] Preferably, the left Fabry-Perot resonator includes: a left first Fabry-Perot resonator, a left second Fabry-Perot resonator, and a left third Fabry-Perot resonator;

[0012] One end of the left third Fabry-Perot resonator is connected to the side surface of the back lining near the wave-facing side, and the other end is bent to the plane where the wave-facing side of the back lining is located and is close to the side surface of the back lining;

[0013] One end of the left second Fabry-Perot resonator is connected to the back lining and is close to the side of the back lining where the left third Fabry-Perot resonator is connected to the back lining and is opposite to the wave-facing side. The other end of the left second Fabry-Perot resonator is bent to the plane where the wave-facing side of the back lining is located and is close to the side of the left third Fabry-Perot resonator where the other end is away from the back lining;

[0014] One end of the left first Fabry-Perot resonator is connected to the back lining and is close to the side of the back lining where the left second Fabry-Perot resonator is connected to the back lining and is opposite to the wave-facing side. The other end of the left first Fabry-Perot resonator is bent to the plane where the wave-facing side of the back lining is located and is close to the side of the left second Fabry-Perot resonator where the other end is away from the back lining.

[0015] Preferably, the right Fabry-Perot resonator includes: a right first Fabry-Perot resonator, a right second Fabry-Perot resonator, and a right third Fabry-Perot resonator;

[0016] One end of the right third Fabry-Perot resonator is connected to the side surface of the back lining near the wave-facing side, and the other end is bent to the plane where the wave-facing side of the back lining is located and is close to the side surface of the back lining;

[0017] One end of the second right Fabry - Perot resonator is connected to the backing and is close to the side of the end of the third right Fabry - Perot resonator connected to the backing that faces away from the wave - incoming side, and the other end of the second right Fabry - Perot resonator is bent to the plane where the wave - incoming side of the backing is located and is close to the side of the other end of the third right Fabry - Perot resonator that is away from the backing;

[0018] One end of the first right Fabry - Perot resonator is connected to the backing and is close to the side of the end of the second right Fabry - Perot resonator connected to the backing that faces away from the wave - incoming side, and the other end of the first right Fabry - Perot resonator is bent to the plane where the wave - incoming side of the backing is located and is close to the side of the other end of the second right Fabry - Perot resonator that is away from the backing.

[0019] Preferably, the incident wave enters the Fabry - Perot resonator group and the backing from the wave - incoming side;

[0020] When the incident wave is an electromagnetic wave, the materials of the Fabry - Perot resonator group include: carbon - based, silicon - based, and dielectric materials;

[0021] When the incident wave is a mechanical wave, the materials of the Fabry - Perot resonator group include: air cavity, metal, rubber, and plastic.

[0022] Preferably, the backing includes: a left - hand sub - backing, a right - hand sub - backing, and a sub - backing intermediate clamp;

[0023] Both sides of the sub - backing intermediate clamp are respectively connected to the left - hand sub - backing and the right - hand sub - backing. The sides of the left - hand sub - backing and the right - hand sub - backing that face away from the sub - backing intermediate clamp are both set in a stepped shape, and the sub - backing intermediate clamp is set in a conical shape.

[0024] Preferably, the gaps include: a left - hand Fabry - Perot resonator gap and a right - hand Fabry - Perot resonator gap;

[0025] The left - hand Fabry - Perot resonator gap includes a first left - hand Fabry - Perot resonator gap and a second left - hand Fabry - Perot resonator gap. The first left - hand Fabry - Perot resonator gap is set between the first left - hand Fabry - Perot resonator and the second left - hand Fabry - Perot resonator, and the second left - hand Fabry - Perot resonator gap is set between the second left - hand Fabry - Perot resonator and the third left - hand Fabry - Perot resonator;

[0026] The right - hand Fabry - Perot resonator gap includes a first right - hand Fabry - Perot resonator gap and a second right - hand Fabry - Perot resonator gap. The first right - hand Fabry - Perot resonator gap is set between the first right - hand Fabry - Perot resonator and the second right - hand Fabry - Perot resonator, and the second right - hand Fabry - Perot resonator gap is set between the second right - hand Fabry - Perot resonator and the third right - hand Fabry - Perot resonator.

[0027] Preferably, one side of the left Fabry - Perot resonator facing away from the wave - incoming side is connected to the left wrapping layer, and one side of the right Fabry - Perot resonator facing away from the wave - incoming side is connected to the right wrapping layer;

[0028] One side of the left wrapping layer and the right wrapping layer, one side of the left Fabry - Perot resonator and the right Fabry - Perot resonator facing away from the wave - incoming side, and one side of the backing facing away from the wave - incoming side together form the back - wave side;

[0029] The ends of the left Fabry - Perot resonator and the right Fabry - Perot resonator bent towards the wave - incoming side and the end of the backing on the wave - incoming side together form the wave - incoming side.

[0030] Preferably, a covering layer is provided on the wave - incoming side of the backing and the Fabry - Perot resonator group.

[0031] Preferably, the covering layer is made of metal or polymer resin material.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The provided roll - type wave - absorbing structure of the present invention places the backing that provides the total - reflection function inside, which is significantly different from the existing wave - absorbing structures that place the backing on the back - wave side, and can avoid the resulting increase in thickness;

[0034] 2. The provided roll - type wave - absorbing structure of the present invention uses a bent - form Fabry - Perot resonator, which is different from the straight - form Fabry - Perot resonator often used in existing wave - absorbing structures, and it is easier to make the overall structure thinner;

[0035] 3. The provided roll - type wave - absorbing structure of the present invention arranges the Fabry - Perot resonators with different bending lengths in an onion - roll - covering form from the outside to the inside. The outer - layer Fabry - Perot resonator can directly serve as the support for the inner - layer Fabry - Perot resonator. Compared with the existing wave - absorbing structures that gradually arrange different - shaped scatterers in the out - of - plane vertical direction, it avoids the need for an additional positioning mechanism in production and simplifies the process difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the following detailed description of the non - restrictive embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present invention will become more apparent:

[0037] Figure 1 It is a schematic diagram of the incident wave incident on the roll - type wave - absorbing structure;

[0038] Figure 2 It is a schematic diagram (one) of the roll - type wave - absorbing structure;

[0039] Figure 3 It is a schematic diagram of the array application of the roll - type wave - absorbing structure with a wrapping layer;

[0040] Figure 4Schematic diagram of adding a covering layer to a wrapped-layer coil-shaped wave-absorbing structure;

[0041] Figure 5 Schematic diagram of a coil-shaped wave-absorbing structure (II);

[0042] Figure 6 Schematic diagram of a coil-shaped wave-absorbing structure (III);

[0043] Figure 7 Simulation result of the sound wave absorption coefficient of a single outermost Fabry-Perot resonator;

[0044] Figure 8 Simulation result of the sound wave absorption coefficient of a coil-shaped wave-absorbing structure;

[0045] As shown in the figure:

[0046]

[0047] Specific implementation manner

[0048] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0049] Embodiment 1

[0050] As Figure 1 shown, this embodiment provides a coil-shaped wave-absorbing structure including: a backing 11 and a Fabry-Perot resonator group; one end of the backing 11 is set as the wave-incident side, and the other end is set as the wave-back side. A group or multiple groups of Fabry-Perot resonator groups are connected to the side surface between the wave-incident side and the wave-back side of the backing 11. Each group of Fabry-Perot resonator groups is stacked in the form of an onion roll by multiple Fabry-Perot resonator units, and a gap is provided between adjacent Fabry-Perot resonator units. The onion roll form is set such that one end of multiple Fabry-Perot resonator units is stacked and connected to the side surface of the backing 11 along the direction from the wave-incident side to the wave-back side, and the other ends of the multiple Fabry-Perot resonator units are bent to the plane where the wave-incident side of the backing 11 is located and are arranged layer by layer along the direction away from the backing 11. The incident wave is incident on the coil-shaped wave-absorbing structure from the wave-incident side. The coil-shaped wave-absorbing structure composed of multiple backings 11 and Fabry-Perot resonator groups can be arranged in an array. When the incident wave is an electromagnetic wave, the material of the Fabry-Perot resonator group includes: carbon-based, silicon-based, and dielectric materials. When the incident wave is a mechanical wave, the material of the Fabry-Perot resonator group includes: air cavity, metal, rubber, and plastic.

[0051] As Figure 2As shown, the backing 11 includes: a left sub-backing 111, a right sub-backing 112, and a sub-backing intermediate clamping block 113; the two sides of the sub-backing intermediate clamping block 113 are respectively connected to the left sub-backing 111 and the right sub-backing 112, and one side of the left sub-backing 111 and the right sub-backing 112 facing away from the sub-backing intermediate clamping block 113 is set to be stepped, and the sub-backing intermediate clamping block 113 is set to be conical.

[0052] The Fabry-Perot resonator group includes: a left Fabry-Perot resonator 21 and a right Fabry-Perot resonator 22; the two sides of the side surface between the wave-facing side and the wave-back side of the backing 11 are respectively connected to the left Fabry-Perot resonator 21 and the right Fabry-Perot resonator 22. The left Fabry-Perot resonator 21 includes: a left first Fabry-Perot resonator 211, a left second Fabry-Perot resonator 212, and a left third Fabry-Perot resonator 213; one end of the left third Fabry-Perot resonator 213 is connected to the side surface of the backing 11 near the wave-facing side, and the other end is bent to the plane where the wave-facing side of the backing 11 is located and is close to the side surface of the backing 11. One end of the left second Fabry-Perot resonator 212 is connected to the backing 11 and is close to the side of the end of the left third Fabry-Perot resonator 213 connected to the backing 11 facing away from the wave-facing side. The other end of the left second Fabry-Perot resonator 212 is bent to the plane where the wave-facing side of the backing 11 is located and is close to the side of the other end of the left third Fabry-Perot resonator 213 away from the backing 11. One end of the left first Fabry-Perot resonator 211 is connected to the backing 11 and is close to the side of the end of the left second Fabry-Perot resonator 212 connected to the backing 11 facing away from the wave-facing side. The other end of the left first Fabry-Perot resonator 211 is bent to the plane where the wave-facing side of the backing 11 is located and is close to the side of the other end of the left second Fabry-Perot resonator 212 away from the backing 11. The right Fabry-Perot resonator 22 includes: a right first Fabry-Perot resonator 221, a right second Fabry-Perot resonator 222, and a right third Fabry-Perot resonator 223; one end of the right third Fabry-Perot resonator 223 is connected to the side surface of the backing 11 near the wave-facing side, and the other end is bent to the plane where the wave-facing side of the backing 11 is located and is close to the side surface of the backing 11. One end of the right second Fabry-Perot resonator 222 is connected to the backing 11 and is close to the side of the end of the right third Fabry-Perot resonator 223 connected to the backing 11 facing away from the wave-facing side. The other end of the right second Fabry-Perot resonator 222 is bent to the plane where the wave-facing side of the backing 11 is located and is close to the side of the other end of the right third Fabry-Perot resonator 223 away from the backing 11. One end of the right first Fabry-Perot resonator 221 is connected to the backing 11 and is close to the side of the end of the right second Fabry-Perot resonator 222 connected to the backing 11 facing away from the wave-facing side. The other end of the right first Fabry-Perot resonator 221 is bent to the plane where the wave-facing side of the backing 11 is located and is close to the side of the other end of the right second Fabry-Perot resonator 222 away from the backing 11.

[0053] The gaps include: the left Fabry-Perot resonator gap 31 and the right Fabry-Perot resonator gap 32; the left Fabry-Perot resonator gap 31 includes the first left Fabry-Perot resonator gap 311 and the second left Fabry-Perot resonator gap 312. The first left Fabry-Perot resonator gap 311 is provided between the first left Fabry-Perot resonator 211 and the second left Fabry-Perot resonator 212, and the second left Fabry-Perot resonator gap 312 is provided between the second left Fabry-Perot resonator 212 and the third left Fabry-Perot resonator 213. The right Fabry-Perot resonator gap 32 includes the first right Fabry-Perot resonator gap 321 and the second right Fabry-Perot resonator gap 322. The first right Fabry-Perot resonator gap 321 is provided between the first right Fabry-Perot resonator 221 and the second right Fabry-Perot resonator 222, and the second right Fabry-Perot resonator gap 322 is provided between the second right Fabry-Perot resonator 222 and the third right Fabry-Perot resonator 223.

[0054] As Figure 4 As shown, the back side of the left Fabry-Perot resonator 21 facing away from the wave-incident side is connected to the left cladding layer 41, and the back side of the right Fabry-Perot resonator 22 facing away from the wave-incident side is connected to the right cladding layer 42; one side of the left cladding layer 41 and the right cladding layer 42, the back sides of the left Fabry-Perot resonator 21 and the right Fabry-Perot resonator 22 facing away from the wave-incident side, and the back side of the backing 11 facing away from the wave-incident side together form the back wave side, and the ends of the left Fabry-Perot resonator 21 and the right Fabry-Perot resonator 22 that are bent towards the wave-incident side and the end of the backing 11 on the wave-incident side together form the wave-incident side. A covering layer 51 is provided on the wave-incident side of the backing 11 and the Fabry-Perot resonator group, and the covering layer 51 is made of a metal or a polymer resin material.

[0055] Each Fabry-Perot resonator in the curly absorber with a bent form is equivalent to bending the traveling path of the incident wave. Therefore, for the same traveling distance of the incident wave (that is, for absorbing incident waves of the same wavelength), the Fabry-Perot resonator with a bent form can be made thinner than the Fabry-Perot resonator with a straight form. The ultrathin in the ultrathin wideband curly absorbing structure is defined relative to the wavelength of the wave to be absorbed. Generally, if it can be made less than 1 / 4 wavelength, it can be considered ultrathin. The thickness dimension of the curly absorbing structure proposed in this embodiment is 1 mm - 100 mm.

[0056] Embodiment 2

[0057] Embodiment 2 is a preferred example of Embodiment 1.

[0058] As Figures 1 to 4As shown, the backing 11 of the roll-type absorbing structure provided in this embodiment is located inside, and at least one of the left and right sides thereof is arranged with at least one bent Fabry-Perot resonator. On the one hand, the backing 11 providing the total reflection function is placed inside to avoid the increase in thickness caused thereby; on the other hand, Fabry-Perot resonators with different bending lengths are arranged in the horizontal direction in the plane and arranged from the outside to the inside in a form similar to an onion roll. The wave-facing side end surface of the roll-type absorbing structure is flat, and the back-wave side end surface is provided by the outermost Fabry-Perot resonator, thereby ensuring that both side end surfaces of the roll-type absorbing structure are flat.

[0059] In this embodiment, the first Fabry-Perot resonator 211 on the left, the second Fabry-Perot resonator 212 on the left, and the third Fabry-Perot resonator 213 on the left are arranged from outside to inside in a manner similar to an onion roll, wherein a first gap 311 of the Fabry-Perot resonator on the left exists between the first Fabry-Perot resonator 211 on the left and the second Fabry-Perot resonator 212 on the left, and a second gap 312 of the Fabry-Perot resonator on the left exists between the second Fabry-Perot resonator 212 on the left and the third Fabry-Perot resonator 213 on the left; similarly, the first Fabry-Perot resonator 221 on the right, the second Fabry-Perot resonator 222 on the right, and the third Fabry-Perot resonator 223 on the right are arranged from outside to inside in a manner similar to an onion roll, wherein a first gap 321 of the Fabry-Perot resonator on the right exists between the first Fabry-Perot resonator 221 on the right and the second Fabry-Perot resonator 222 on the right, and a second gap 322 of the Fabry-Perot resonator on the right exists between the second Fabry-Perot resonator 222 on the right and the third Fabry-Perot resonator 223 on the right.

[0060] exist Figure 1 The middle wavy arrow represents the incident wave, and the backing 11 and the upper surface of the Fabry-Perot resonator group serve as the wave-facing side, and their end faces are flush. The backing 11 and the lower surface of the first Fabry-Perot resonator 211 on the left side and the first Fabry-Perot resonator 221 on the right side placed in the outermost layer serve as the back-wave side, and their end faces are flush.

[0061] In this embodiment, all Fabry-Perot resonators are bent in an arc shape, one end of which is rigidly connected to the backing 11 by gluing, welding, riveting, threading, etc., and the other end is free and faces the wave-facing side.

[0062] Depending on the type of incident wave to be absorbed, the material composition of the Fabry-Perot resonator group shown needs to be different. When the incident wave is an electromagnetic wave, carbon-based, silicon-based, dielectric materials, etc. can be used to make the Fabry-Perot resonator group; when the incident wave is a mechanical wave, air cavity, metal, rubber, plastic, etc. can be used to make the Fabry-Perot resonator group. In order to facilitate production and preparation, each Fabry-Perot resonator contained in the same wave absorbing structure can be made of the same material.

[0063] In this embodiment, for the case of absorbing electromagnetic waves, the design parameters of the Fabry-Perot resonator material are the permittivity ε and the permeability μ. Moreover, in order to achieve near-perfect wave absorption, the impedance matching condition needs to be satisfied, that is

[0064]

[0065] where represents the impedance of electromagnetic waves in the transmission medium (such as air, water, etc.).

[0066] For the case of absorbing mechanical waves, the design parameters of the Fabry-Perot resonator material are the mass density ρ and the bulk modulus κ. Similarly, in order to achieve near-perfect wave absorption, the impedance matching condition also needs to be satisfied, that is

[0067]

[0068] where represents the impedance of mechanical waves in the transmission medium (such as air, water, etc.).

[0069] The impedance of the Fabry-Perot resonator material includes a real part (resistance) and an imaginary part (reactance), but the transmission medium impedance or only includes the real part. In order to satisfy the impedance matching condition, the imaginary part of the impedance of the Fabry-Perot resonator material needs to be zero, that is, it needs to be in a resonance state.

[0070] There is a deterministic relationship between the frequency at which the Fabry-Perot resonator generates Fabry resonance and its length. For a certain Fabry-Perot resonator, at its Fabry resonance frequency, the relationship between the length L and the wavelength λ can be expressed as:

[0071]

[0072] where m = 1, 2, 3,... represents the resonance order.

[0073] Different Fabry-Perot resonators are separated from each other by gaps, so as to ensure that each Fabry-Perot resonator can work independently according to the preset resonance frequency. The size of the gap can be determined by the size formed by the natural contact of the sides of two adjacent Fabry-Perot resonators, and a material with a much smaller impedance than that of the Fabry-Perot resonator itself can also be filled to better ensure the existence of the gap.

[0074] In some embodiments, the backing 11 is composed of a left sub-backing 111, a right sub-backing 112, and a sub-backing intermediate block 113 therebetween. Among them, the left sub-backing 111 and the right sub-backing 112 are stepped structures, which are used to adjust the lengths of the Fabry-Perot resonators on the left and right sides respectively, so as to realize the adjustment of the absorption peak frequency.

[0075] For the case where the left sub-backing 111 and the right sub-backing 112 have been shaped and cannot be changed, the lengths of the Fabry-Perot resonators on the left and right sides can be adjusted by embedding the sub-backing intermediate blocks 113 with different cone angles and different thicknesses.

[0076] In some embodiments, the sub-backing intermediate block 113 can be made of an elastic material. When the wave-absorbing structure is applied to a curved surface structure (such as a curved machine housing), a certain amount of bending deformation can occur, making it easier to install and construct.

[0077] In some embodiments, a left wrapping layer 41 and a right wrapping layer 42 can be added to the rolled wave-absorbing structure, and the wave-absorbing structure can be regarded as an integral unit. On this basis, by arraying the unit in the in-plane or normal direction, a periodically extended wave-absorbing material can be formed.

[0078] It should be specifically noted that in order to ensure that each Fabry-Perot resonator can work independently according to the preset resonance frequency, the wrapping layer should be made of a material with a much smaller impedance than that of the Fabry-Perot resonator itself.

[0079] In some embodiments, a covering layer 51 can be added to the rolled wave-absorbing structure. The covering layer 51 is located on the wave-facing side of the rolled wave-absorbing structure, and materials such as metals or polymer resins can be selected to provide functions such as corrosion resistance, antibacterial properties, and anti-fouling by underwater organisms, further increasing the versatility, weather resistance, and service reliability of the rolled wave-absorbing structure.

[0080] Example 3

[0081] As Figure 5 shown, in some embodiments, all the Fabry-Perot resonators do not adopt the bending form that changes according to the radian as in Example 1 and Example 2, but adopt a bending form that changes according to the corner.

[0082] Example 4

[0083] As Figure 6 shown, in some embodiments, the Fabry-Perot resonators are not arranged on the left and right sides of the backing 11 as in Example 1 and Example 2, but are arranged in a petal-shaped rotation around the backing 11 for one week.

[0084] In the present invention, the bending form of the Fabry-Perot resonator and its arrangement form with the backing 11 are not limited to Example 3 and Example 4.

[0085] Example 5

[0086] This embodiment takes the wave-absorbing structure shown in Embodiment 1 as an example, and characterizes the wave-absorbing performance by simulating and calculating its absorption coefficient for underwater-propagating sound waves. The simulation model includes two physical fields, namely the pressure acoustics physical field where the incident wave is located and the solid mechanics physical field where the wave-absorbing material is located, and continuity boundary conditions are defined at the interface between the two. In the pressure acoustics physical field, the medium is defined as water, with a mass density ρ w = 1000 kg / m 3 , and the sound speed c w = 1470 m / s. In the solid mechanics physical field, the mass density of the material constituting the Fabry-Perot resonator is defined as ρ c = 5500 kg / m 3 , the Young's modulus is E c = 0.37*(1 + j*0.26) GPa, and the Poisson's ratio is ν c = 0.4. The imaginary part in the Young's modulus represents the loss factor of the material constituting the Fabry-Perot resonator. The amplitude of the incident wave is P i , and the amplitude of the reflected wave formed after the incident wave reaches the wave-absorbing structure is P r , then the absorption coefficient α can be expressed as:

[0087]

[0088] As Figure 7 shown, it is the simulation result of the sound wave absorption coefficient of a single outermost Fabry-Perot resonator in Embodiment 1. The absorption coefficient of a single outermost Fabry-Perot resonator can exceed 0.6 at 2100 Hz, which corresponds to its first-order Fabry resonance mode, and the absorption coefficient in the frequency band of 3700 Hz - 10900 Hz also exceeds 0.6, showing excellent wave-absorbing performance.

[0089] As Figure 8 shown, it is the simulation result of the sound wave absorption coefficient of Embodiment 1. The overall thickness of the wave-absorbing structure shown in Embodiment 1 is 40 mm. It can be seen from the absorption coefficient spectrum that the wave-absorbing structure shown in Embodiment 1 has near-perfect wave-absorbing performance in a wide frequency band above 2100 Hz. And compared with Figure 7 , it can be known that the starting frequency of the near-perfect wave-absorbing performance is related to the first-order Fabry resonance mode of the outermost Fabry-Perot resonator. Therefore, in order to obtain a lower starting frequency of the near-perfect wave-absorbing performance and thus obtain a wider near-perfect wave-absorbing bandwidth, the length of the outermost Fabry-Perot resonator can be appropriately increased.

[0090] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0091] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined arbitrarily with each other.

Claims

1. An ultra-thin broadband rolled wave-absorbing structure, characterized in that Comprising: A backing (11) and a Fabry - Perot resonator group; One end of the backing (11) is set as the wave - facing side, and the other end is set as the wave - backing side. One or more groups of the Fabry - Perot resonator groups are connected to the side surface between the wave - facing side and the wave - backing side of the backing (11). Each group of the Fabry - Perot resonator groups is formed by laminating a plurality of Fabry - Perot resonator units in the form of an onion roll, and a gap is provided between adjacent Fabry - Perot resonator units; The form of the onion roll is set such that one ends of a plurality of the Fabry - Perot resonator units are laminated and connected to the side surface of the backing (11) along the direction from the wave - facing side to the wave - backing side, and the other ends of the plurality of Fabry - Perot resonator units are bent to the plane where the wave - facing side of the backing (11) is located and are arranged layer by layer along the direction away from the backing (11); The backing (11) includes: a left sub - backing (111), a right sub - backing (112), and a sub - backing intermediate clamp (113); The two sides of the sub - backing intermediate clamp (113) are respectively connected to the left sub - backing (111) and the right sub - backing (112). One sides of the left sub - backing (111) and the right sub - backing (112) facing away from the sub - backing intermediate clamp (113) are both set in a stepped shape, and the sub - backing intermediate clamp (113) is set in a conical shape.

2. The ultra-thin broadband roll-type wave-absorbing structure according to claim 1, characterized in that, The Fabry - Perot resonator group includes: a left Fabry - Perot resonator (21) and a right Fabry - Perot resonator (22); The two sides of the side surface between the wave - facing side and the wave - backing side of the backing (11) are respectively connected to the left Fabry - Perot resonator (21) and the right Fabry - Perot resonator (22).

3. The ultra-thin broadband rolled wave-absorbing structure according to claim 2, characterized in that, The left Fabry - Perot resonator (21) includes: a left third Fabry - Perot resonator (213), a left second Fabry - Perot resonator (212), and a left first Fabry - Perot resonator (211); One end of the left third Fabry - Perot resonator (213) is connected to the side surface of the backing (11) near the wave - facing side, and the other end is bent to the plane where the wave - facing side of the backing (11) is located and is close to the side surface of the backing (11); One end of the left second Fabry - Perot resonator (212) is connected to the backing (11) and is close to the side of the end of the left third Fabry - Perot resonator (213) connected to the backing (11) facing away from the wave - facing side. The other end of the left second Fabry - Perot resonator (212) is bent to the plane where the wave - facing side of the backing (11) is located and is close to the side of the other end of the left third Fabry - Perot resonator (213) away from the backing (11); One end of the left first Fabry - Perot resonator (211) is connected to the backing (11) and is close to the side of the end of the left second Fabry - Perot resonator (212) connected to the backing (11) facing away from the wave - facing side. The other end of the left first Fabry - Perot resonator (211) is bent to the plane where the wave - facing side of the backing (11) is located and is close to the side of the other end of the left second Fabry - Perot resonator (212) away from the backing (11).

4. The ultra-thin broadband rolled wave-absorbing structure according to claim 3, characterized in that, The right Fabry - Perot resonator (22) includes: a right third Fabry - Perot resonator (223), a right second Fabry - Perot resonator (222), and a right first Fabry - Perot resonator (221); One end of the third Fabry-Perot resonator (223) on the right is connected to the side of the backing (11) near the wave-incident side, and the other end is bent to the plane where the wave-incident side of the backing (11) is located and is close to the side of the backing (11). One end of the second Fabry-Perot resonator (222) on the right is connected to the backing (11) and is close to the side of the end of the third Fabry-Perot resonator (223) on the right that is connected to the backing (11) and faces away from the wave-incident side. The other end of the second Fabry-Perot resonator (222) on the right is bent to the plane where the wave-incident side of the backing (11) is located and is close to the side of the other end of the third Fabry-Perot resonator (223) that is away from the backing (11). One end of the first Fabry-Perot resonator (221) on the right is connected to the backing (11) and is close to the side of the end of the second Fabry-Perot resonator (222) on the right that is connected to the backing (11) and faces away from the wave-incident side. The other end of the first Fabry-Perot resonator (221) on the right is bent to the plane where the wave-incident side of the backing (11) is located and is close to the side of the other end of the second Fabry-Perot resonator (222) that is away from the backing (11).

5. The ultra-thin broadband rolled wave-absorbing structure according to claim 1, wherein: The incident wave is incident on the Fabry-Perot resonator group and the backing (11) from the wave-incident side. When the incident wave is an electromagnetic wave, the materials of the Fabry-Perot resonator group include: carbon-based, silicon-based, and dielectric materials. When the incident wave is a mechanical wave, the materials of the Fabry-Perot resonator group include: air cavity, metal, rubber, and plastic.

6. The ultra-thin broadband roll-type absorbing structure according to claim 4, wherein The gaps include: the left Fabry-Perot resonator gap (31) and the right Fabry-Perot resonator gap (32). The left Fabry-Perot resonator gap (31) includes the first left Fabry-Perot resonator gap (311) and the second left Fabry-Perot resonator gap (312). The second left Fabry-Perot resonator gap (312) is provided between the third left Fabry-Perot resonator (213) and the second left Fabry-Perot resonator (212), and the first left Fabry-Perot resonator gap (311) is provided between the second left Fabry-Perot resonator (212) and the first left Fabry-Perot resonator (211). The right Fabry-Perot resonator gap (32) includes the first right Fabry-Perot resonator gap (321) and the second right Fabry-Perot resonator gap (322). The second right Fabry-Perot resonator gap (322) is provided between the third right Fabry-Perot resonator (223) and the second right Fabry-Perot resonator (222), and the first right Fabry-Perot resonator gap (321) is provided between the second right Fabry-Perot resonator (222) and the first right Fabry-Perot resonator (221).

7. The ultra-thin broadband roll-type absorbing structure according to claim 2, characterized in that: One side of the left Fabry-Perot resonator (21) that faces away from the wave-incident side is connected to the left wrapping layer (41), and one side of the right Fabry-Perot resonator (22) that faces away from the wave-incident side is connected to the right wrapping layer (42). One side of the left wrapping layer (41) and the right wrapping layer (42), one side of the left Fabry-Perot resonator (21) and the right Fabry-Perot resonator (22) that faces away from the wave-incident side, and one side of the backing (11) that faces away from the wave-incident side together form the back wave side. The left Fabry-Perot resonator (21) and the right Fabry-Perot resonator (22) are bent towards one end of the wave-facing side, and together with one end of the wave-facing side of the backing (11), form the wave-facing side.

8. The ultra-thin broadband rolled wave-absorbing structure according to claim 1, wherein: A covering layer (51) is provided on the wave-facing side of the backing (11) and the Fabry-Perot resonator group.

9. The ultra-thin broadband roll-type wave-absorbing structure according to claim 8, characterized in that: The covering layer (51) is made of a metal or a polymer resin material.

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