A lightweight, broadband traveling wave suppression and absorption integrated structure

Abstract

This invention discloses a lightweight, broadband traveling wave suppression and absorption integrated structure in the field of absorbing materials technology. The structure includes a structural layer comprising a wave-transmitting layer, a traveling wave suppression layer, an absorption layer, and a reflection layer. The wave-transmitting layer is located on the upper surface of the structural layer, and the reflection layer is located on the lower surface. This invention improves high-frequency absorption performance through a multi-layered composite structure. First, the wave-transmitting layer prioritizes reducing surface reflection, ensuring efficient entry of high-frequency electromagnetic waves. The traveling wave suppression layer optimizes attenuation for high-frequency traveling wave modes. The absorption layer employs an alternating stacking configuration, extending the electromagnetic wave propagation path through multi-stage impedance matching and enhancing high-frequency energy dissipation. The reflection layer facilitates the re-entry of unabsorbed residual high-frequency waves into the loss region, overcoming the deficiency of reduced polarization loss at high frequencies and achieving stable absorption across a wide bandwidth.

Description

Technical Field

[0001] This utility model relates to the field of microwave absorbing materials technology, and in particular to a lightweight broadband traveling wave suppression and microwave absorption integrated structure. Background Technology

[0002] With the rapid development of radio technology and the increasing sophistication of radar detection systems, weapons and equipment face growing threats on the battlefield. Radar stealth technology has become a hot topic of research and focus for major military powers, and stealth performance has become an important criterion for judging the advancement of equipment. Normally, when electromagnetic waves are incident perpendicularly on a target structure, the scattering mechanism is primarily specular scattering. Using shape design and multi-layer absorbing structures can effectively absorb electromagnetic waves, thus suppressing specular scattering over a relatively wide frequency range. However, when the incident angle of the electromagnetic wave increases further to grazing incidence, and the electric field direction of the incident electromagnetic wave is parallel to the surface propagation direction, it easily excites traveling waves propagating along the surface. At this point, the scattering mechanism will shift to traveling wave scattering, and conventional multi-layer absorbing structures cannot effectively suppress surface traveling waves.

[0003] Typically, absorbing materials used for traveling wave scattering suppression require high losses to attenuate surface currents. However, high-loss absorbing materials often struggle to achieve broadband absorption under perpendicular incidence due to impedance mismatch. In other words, absorbing materials used for both specular and traveling wave scattering exhibit contradictory electromagnetic properties, making it difficult to simultaneously suppress both scattering mechanisms. In related technologies, such as CN118791871A, a dielectric absorbing honeycomb for traveling wave scattering suppression and its manufacturing method are disclosed. The prepared absorbing honeycomb exhibits high dielectric loss and can achieve high traveling wave attenuation capability in the lower frequency band of 1.0–2.5 GHz.

[0004] This absorbing cell exhibits excellent low-frequency performance, primarily due to the polarization relaxation and conductivity loss mechanism of the dielectric material. At this frequency, the electromagnetic wave wavelength is relatively long, and the dipoles inside the material can effectively follow the alternating electric field, thereby generating significant dielectric loss.

[0005] However, as the frequency increases, the wavelength of electromagnetic waves shortens, and the response speed of the dipole gradually lags behind the change in the electric field, leading to a decrease in polarization loss. Simultaneously, the skin effect intensifies at high frequencies, making it difficult for electromagnetic waves to penetrate deep into the material, thus reducing energy dissipation efficiency. Furthermore, the structural resonance characteristics at high frequencies may deviate from the design frequency, further weakening the traveling wave suppression capability, ultimately resulting in insufficient high-frequency absorption and a deterioration in suppression effect. Therefore, we propose a lightweight, broadband traveling wave suppression and absorption integrated structure. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a lightweight, broadband traveling wave suppression and absorption integrated structure. By using a multi-layer composite structure, it improves the absorption performance in the high-frequency band, overcoming the defect of reduced polarization loss at high frequencies and suppressing the skin effect through distributed loss, thereby achieving a stable absorption effect over a wide bandwidth.

[0007] The purpose of this utility model is achieved as follows: a lightweight broadband traveling wave suppression and absorption integrated structure, comprising a structural layer, wherein the structural layer includes a wave-transmitting layer, a traveling wave suppression layer, an absorption layer and a reflection layer, wherein the wave-transmitting layer is set as the upper surface of the structural layer, the reflection layer is set as the lower surface of the structural layer, one side of the traveling wave suppression layer is bonded to the wave-transmitting layer, the other side of the traveling wave suppression layer is bonded to the absorption layer, and the absorption layer is bonded to the reflection layer.

[0008] Optionally, the structural layer is specifically composed of a wave-transmitting layer, a traveling wave suppression layer, an absorption layer, and a reflective layer stacked in sequence, with an adhesive film disposed between each layer.

[0009] Optionally, the traveling wave suppression layer includes a magnetic absorbing honeycomb and a dielectric absorbing honeycomb, wherein the magnetic absorbing honeycomb and the dielectric absorbing honeycomb are bonded together, and the magnetic absorbing honeycomb is bonded to the wave-transparent layer.

[0010] Optionally, the absorption layer includes a dielectric layer and a resistive film, with dielectric layers on both sides of the absorption layer, and the dielectric layers and resistive films are stacked alternately.

[0011] Optionally, the number of dielectric layers is n layers, and a resistive film is disposed between adjacent dielectric layers. The thickness of the n dielectric layers decreases sequentially from dielectric absorbing honeycomb to reflective layer.

[0012] Optionally, the thickness of the dielectric layer ranges from 2 to 4 mm, and the thickness of the resistive film is matched based on the nth dielectric layer, wherein the thickness t (mm) of the dielectric layer satisfies The thickness of the resistive film between the nth dielectric layer and the (n-1)th dielectric layer is .

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. By using a multi-layer composite structure to improve the absorption performance in the high-frequency band, firstly, the wave-transmitting layer prioritizes reducing surface reflection to ensure efficient entry of high-frequency electromagnetic waves, and the traveling wave suppression layer optimizes the attenuation of traveling wave modes in the high-frequency band; the absorption layer adopts an alternating stacking form, and extends the electromagnetic wave propagation path through multi-level impedance matching to enhance high-frequency energy dissipation; the reflection layer promotes the secondary entry of unabsorbed residual high-frequency waves into the loss region, which not only overcomes the defect of reduced polarization loss at high frequencies, but also suppresses the skin effect through distributed loss, thereby achieving a stable absorption effect in a wide bandwidth.

[0015] 2. The decreasing dielectric layer thickness combined with the matching resistive film can form a gradual impedance transition characteristic. The regular change in the dielectric layer thickness can optimize the penetration depth and reflection phase of electromagnetic waves in different frequency bands. The resistive film is dynamically adjusted according to the characteristics of the dielectric layer to ensure the impedance continuity between each layer. This allows the absorption layer structure to avoid energy reflection caused by impedance abrupt changes and improve the overall absorption efficiency through a gradual attenuation mechanism, while also taking into account the requirements of broadband matching and structural compactness. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure provided by this utility model.

[0018] In the diagram: 1. Wave-transmitting layer; 2. Traveling wave suppression layer; 21. Magnetic absorbing honeycomb; 22. Dielectric absorbing honeycomb; 3. Absorbing layer; 31. Dielectric layer; 32. Resistive film; 4. Reflective layer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1 The lightweight broadband traveling wave suppression and absorption integrated structure shown includes a structural layer, which includes a wave-transmitting layer 1, a traveling wave suppression layer 2, an absorption layer 3, and a reflection layer 4. The wave-transmitting layer 1 is set as the upper surface of the structural layer, and the reflection layer 4 is set as the lower surface of the structural layer. One side of the traveling wave suppression layer 2 is bonded to the wave-transmitting layer 1, and the other side of the traveling wave suppression layer 2 is bonded to the absorption layer 3. The absorption layer 3 is bonded to the reflection layer 4.

[0021] Furthermore, the composite material structure in the embodiments provided in this application consists of a wave-transmitting layer 1, a traveling wave suppression layer 2, an absorption layer 3, and a reflective layer 4. The traveling wave suppression layer 2 is composed of a magnetic absorbing honeycomb 21 and a dielectric absorbing honeycomb 22. The absorption layer 3 is composed of a dielectric layer 31 and a resistive film 32 alternately superimposed between the traveling wave suppression layer 2 and the reflective layer 4. All the above layers are connected by an adhesive film. After encapsulation, the structure is placed in an autoclave for hot-press curing to obtain a lightweight broadband traveling wave suppression / absorbing integrated structure.

[0022] Specifically, the structural layer consists of a wave-transmitting layer 1, a traveling wave suppression layer 2, an absorption layer 3, and a reflective layer 4 stacked sequentially, with an adhesive film between each layer. The traveling wave suppression layer 2 includes a magnetic absorbing honeycomb 21 and a dielectric absorbing honeycomb 22. The magnetic absorbing honeycomb 21 and the dielectric absorbing honeycomb 22 are bonded together, and the magnetic absorbing honeycomb 21 is bonded to the wave-transmitting layer 1.

[0023] Furthermore, the wave-transmitting layer 1 is used to ensure the efficient entry of incident electromagnetic waves. Subsequently, the traveling wave suppression layer 2, composed of magnetic absorbing honeycomb 21 and dielectric absorbing honeycomb 22, utilizes the synergistic effect of magnetic loss and dielectric loss to attenuate surface traveling waves without affecting the overall absorption performance. The absorption layer 3 uses alternating stacking of dielectric layer 31 and resistive film 32 to broaden the absorption bandwidth through multi-impedance matching and multiple reflection loss mechanisms, while optimizing electromagnetic wave energy dissipation. The reflective layer 4 blocks the return of residual electromagnetic waves, improving the overall absorption efficiency. The interlayer adhesive films are connected and cured by hot pressing to form a lightweight integrated structure, ensuring mechanical performance while achieving a balance between broadband absorption and traveling wave suppression.

[0024] Specifically, the absorption layer 3 includes a dielectric layer 31 and a resistive film 32. Both sides of the absorption layer 3 are provided with dielectric layers 31, and the dielectric layers 31 and resistive films 32 are stacked alternately.

[0025] Furthermore, the alternating stacked structure of the absorption layer 3 forms a symmetrical impedance transition through the dielectric layers 31 on both sides, thereby reducing the reflection of electromagnetic waves at the interface and improving the transmittance of the incident wave. The alternating arrangement of the intermediate resistive film 32 and the dielectric layer 31 can form a multi-impedance matching layer, gradually adjusting the wave impedance on the electromagnetic wave propagation path to achieve wide-band impedance gradient matching.

[0026] Meanwhile, the resistive film 32 forms distributed loss units at intervals in the dielectric layer 31, which can not only dissipate electromagnetic wave energy directly through ohmic loss, but also extend the electromagnetic wave path by utilizing multiple reflections in the dielectric layer 31, thereby enhancing the energy attenuation effect.

[0027] Specifically, there are n dielectric layers 31, and a resistive film 32 is disposed between each adjacent dielectric layer 31. The thickness of the n dielectric layers 31 decreases sequentially at equal arithmetic progressions from the dielectric absorbing honeycomb 22 to the reflective layer 4. The thickness of the dielectric layer 31 ranges from 2 to 4 mm. The thickness of the resistive film 32 is matched based on the nth dielectric layer 31, and the thickness t (mm) of the dielectric layer 31 satisfies... The thickness of the resistive film 32 between the nth dielectric layer 31 and the (n-1)th dielectric layer 31 is .

[0028] Furthermore, controlling the thickness of the dielectric layer 31 within the range of 2~4mm can ensure sufficient mechanical support and structural stability, avoid the problem of excessive reflection of electromagnetic waves due to excessive thickness or insufficient loss due to excessive thinness. The arithmetic decrease in thickness can form a gradual distribution of dielectric constant, optimize the impedance matching effect, and make the electromagnetic waves transition smoothly between different dielectric layers 31, reducing reflection loss.

[0029] At the same time, this thickness range works in synergy with the resistive film 32 to ensure that electromagnetic waves are fully absorbed during propagation, without energy retention due to excessive thickness of the dielectric layer 31 or excessively fast wave transmission due to excessive thinness, thereby achieving efficient electromagnetic wave attenuation over a wide frequency range.

[0030] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A lightweight broadband traveling wave suppression and absorption integrated structure, comprising a structural layer, characterized in that: The structural layer includes a wave-transmitting layer, a traveling wave suppression layer, an absorption layer, and a reflection layer. The wave-transmitting layer is set as the upper surface of the structural layer, the reflection layer is set as the lower surface of the structural layer, one side of the traveling wave suppression layer is bonded to the wave-transmitting layer, the other side of the traveling wave suppression layer is bonded to the absorption layer, and the absorption layer is bonded to the reflection layer.

2. The lightweight, broadband wave suppression and wave absorption integrated structure of claim 1, wherein: The structural layer is specifically composed of a wave-transmitting layer, a traveling wave suppression layer, an absorption layer, and a reflective layer stacked in sequence, with an adhesive film disposed between each layer.

3. The lightweight, broadband wave suppression and wave absorption integrated structure of claim 1, wherein: The traveling wave suppression layer includes a magnetic absorbing honeycomb and a dielectric absorbing honeycomb, wherein the magnetic absorbing honeycomb and the dielectric absorbing honeycomb are bonded together, and the magnetic absorbing honeycomb is bonded to the wave-transmitting layer.

4. The lightweight broadband traveling wave suppression and absorption integrated structure according to claim 1, characterized in that: The absorption layer includes a dielectric layer and a resistive film, with dielectric layers on both sides of the absorption layer, and the dielectric layers and resistive films are stacked alternately.

5. The lightweight, broadband wave suppression and wave absorption integrated structure of claim 4, wherein: The number of dielectric layers is n layers, and a resistive film is provided between adjacent dielectric layers. The thickness of the n dielectric layers decreases sequentially from dielectric absorbing honeycomb to reflective layer.

6. The lightweight, broadband wave suppression and wave absorption integrated structure of claim 5, wherein: The thickness of the medium layer is in the range of 2-4 mm, the thickness of the resistance film is matched based on the nth medium layer, the thickness t (mm) of the medium layer satisfies , and the thickness of the resistance film between the nth medium layer and the (n-1)th medium layer is .

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