Metamaterial honeycomb
By embedding dynamically tunable metamaterial units and modules into metamaterial honeycomb structures, the problems of poor low-frequency performance and insufficient dynamic tuning in existing technologies are solved, enabling real-time control of wide-band wave absorption and electromagnetic response, and adapting to complex electromagnetic environments.
Patent Information
- Application Number
- CN202520570254.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-28
AI Technical Summary
Existing metamaterial absorbing honeycomb structures have poor performance in the low-frequency band and are difficult to adapt to the needs of complex electromagnetic environments. The integration of dynamic tuning technology with absorbing honeycomb structures is insufficient.
A metamaterial honeycomb structure is designed to achieve real-time control of the absorption frequency band and multi-field coupling control of electromagnetic parameters by embedding dynamically tunable metamaterial units and electrical and temperature control modules in the honeycomb matrix, combined with shape memory alloy tuning structure and FBG fiber optic sensor array.
This study demonstrated the dynamic adaptability of metamaterial cellular structures in complex electromagnetic environments, expanded the absorption frequency band, and improved the controllability and adaptability of absorption performance.
Smart Images
Figure CN223956851U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to metamaterial technology, and more particularly, to a three-field coupling regulation type metamaterial honeycomb structure. BACKGROUND
[0002] With the rapid development of modern electronic equipment and radar detection technology, electromagnetic wave absorbing materials need to have wide frequency, low frequency absorbing ability and dynamic adjustable characteristics. Although the traditional absorbing honeycomb material (such as aramid honeycomb impregnated carbon-based absorbing agent) has the advantages of light weight and high strength, its absorbing frequency band is limited, especially in the low frequency band (such as 1-3GHz). The existing metamaterial absorbing structure (such as square ring resonant unit) can expand the absorbing frequency band through electromagnetic resonance, but its fixed structure is difficult to adapt to the needs of complex electromagnetic environment. In addition, the application of dynamic tuning technology (such as piezoelectric material, liquid crystal or microfluidic regulation) in metamaterials is still in the exploratory stage, and has not been effectively combined with absorbing honeycomb structure. CONTENT OF THE UTILITY MODEL
[0003] The present application aims at the defect that the existing metamaterial absorbing honeycomb cannot be effectively combined with dynamic tuning technology, and provides a metamaterial honeycomb to dynamically switch the absorbing frequency band of the metamaterial honeycomb and dynamically regulate the electromagnetic parameters of the composite material, so as to realize the adjustable characteristics of the absorbing properties.
[0004] The scheme for realizing the above technical effects is as follows: a metamaterial honeycomb is provided, which includes a plurality of honeycomb substrates, the honeycomb substrates are periodically filled with absorbing foam, adjacent honeycomb substrates filled with absorbing foam form a reinforcing rib unit, and a metamaterial unit is embedded on the side wall of the honeycomb substrate; the metamaterial honeycomb further includes an electric control module connected with the metamaterial unit and a temperature control module connected with the honeycomb substrate.
[0005] Preferably, the reinforcing rib unit includes honeycomb substrates arranged in a triangular number.
[0006] Preferably, adjacent reinforcing rib units are spaced apart by at least one cavity of the honeycomb substrate.
[0007] Preferably, the honeycomb substrate is filled with polyurethane absorbing foam with gradually changing density.
[0008] Preferably, the density of the polyurethane absorbing foam gradually changes from 0.05 to 0.3 g / cm 3 .
[0009] Preferably, the metamaterial unit is a double-open-ring arranged in an array.
[0010] Preferably, adjacent metamaterial units are provided with a tuning structure, and the tuning structure is connected with the temperature control module.
[0011] Preferably, the tuning structure is a cross-shaped structure composed of shape memory alloy.
[0012] Preferably, the electric control module comprises piezoelectric ceramics connected with the metamaterial unit.
[0013] Preferably, the temperature control module comprises a thin film heater and / or a thermocouple.
[0014] Preferably, the metamaterial honeycomb further comprises a sensing module.
[0015] Preferably, the sensing module comprises an FBG optical fiber sensor array embedded in the sidewall of the honeycomb base.
[0016] The metamaterial honeycomb of the present application embeds a dynamically tunable metamaterial unit in the honeycomb base, and realizes real-time regulation and control of the wave absorption frequency band by controlling the geometric parameters of the external electric field or temperature control unit, thereby adapting to the needs of complex electromagnetic environment and overcoming the defects of current metamaterial wave absorption structure that is fixed and cannot realize multiple electromagnetic responses of one structure. BRIEF DESCRIPTION OF DRAWINGS
[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application together with the specification.
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.
[0019] Figure 1 The schematic diagram of the honeycomb structure of a preferred embodiment of the present application;
[0020] Figure 2 The schematic diagram of the honeycomb structure of a preferred embodiment of the present application; Figure 1 The schematic diagram of the reinforcing rib unit in the embodiment;
[0021] Figure 3 The schematic diagram of the honeycomb base and the metamaterial unit in the embodiment; Figure 1 The schematic diagram of the honeycomb base and the metamaterial unit in the embodiment;
[0022] Figure 4 The schematic diagram of the metamaterial unit;
[0023] Figure 5 The frame diagram of the control system of a preferred embodiment of the present application;
[0024] Figure 6 The schematic diagram of the electromagnetic response of the experimental example one of the present application;
[0025] Figure 7 The schematic diagram of the electromagnetic response of the experimental example two of the present application;
[0026] Figure 8 The electromagnetic response schematic diagram of the third experimental example of the utility model. DETAILED DESCRIPTION
[0027] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.
[0028] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0029] As Figure 1 The utility model discloses a honeycomb structure schematic diagram of a preferred embodiment. In the embodiment, the metamaterial honeycomb includes a plurality of hexagonal honeycomb matrix 100, the honeycomb matrix 100 is periodically filled with wave-absorbing foam, the adjacent honeycomb matrix filled with wave-absorbing foam forms a reinforcing rib unit 200, and a metamaterial unit is embedded on the side wall of the honeycomb matrix 100. The metamaterial honeycomb further includes an electric control module connected with the metamaterial unit and a temperature control module connected with the honeycomb matrix. The metamaterial unit is a man-made metal microstructure.
[0030] The metamaterial honeycomb is adopted Figure 1 The honeycomb matrix 100 and the reinforcing rib unit 200 form a composite topological structure, thereby strengthening the honeycomb strength structure, and an impedance layer is formed by the wave-absorbing foam to optimize the broadband wave-absorbing performance. The metamaterial unit is deformed and the spacing between adjacent metamaterial units is adjusted by the electric control module and the temperature control module, and the impedance layer of the gradually changing wave-absorbing foam is matched, thereby forming a three-field controllable characteristic of electromechanical heat, which can be widely applied in the fields of stealth aircraft, ship radar shielding and 5G communication equipment anti-interference.
[0031] In Figure 1In this embodiment, the reinforcing rib unit 200 is formed by periodically filling the honeycomb matrix 100 with microwave-absorbing foam. Specifically, the reinforcing rib unit 200 can have various different structures. For example... Figure 2 The diagram illustrates a preferred implementation of the reinforcing rib unit 200. Six cells are arranged in a group, filled with polyurethane absorbing foam of varying density along the L-axis. The density gradually increases from the first reinforcing rib unit 201, the second reinforcing rib unit 202, and the third reinforcing rib unit 203. The six cells are stacked in a 1-2-3 configuration to form a triangular structure, or a multi-triangular structure. Figure 2 In the embodiment, the density of the polyurethane absorbing foam follows an exponential distribution from the first reinforcing rib unit 201 to the third reinforcing rib unit 203, ranging from 0.05 to 0.3 g / cm³. 3 The filled reinforcing rib units 200 have a spacing of no more than 3 rows of holes in the L / W direction, and they are not tightly connected to each other. By filling in this way, the honeycomb can form an impedance gradient layer, presenting an impedance trapezoidal distribution structure, such as a gradient change along the L direction of the honeycomb, thus optimizing broadband absorption performance.
[0032] In other possible implementations, the stiffener unit 200 can also be grouped in groups of three, arranged in a 1-2 pattern, or in groups of ten, arranged in a 1-2-3-4 pattern.
[0033] The microwave-absorbing foam filling the honeycomb cavity can also be filled with other densities. In another possible embodiment, the density of the polyurethane microwave-absorbing foam increases gradually from 0.03 to 0.4 g / cm³ from the first reinforcing rib unit 201 to the third reinforcing rib unit 203. 3 .
[0034] The following combination Figure 3 , Figure 4 This invention describes the metamaterial units 110 disposed in the honeycomb substrate 100. For example... Figure 3 , Figure 4 As shown, metamaterial units 110 are embedded in the sidewalls of the honeycomb substrate 100. The metamaterial units 110 are 4×4 arrayed double-opening square rings 111, with the opening directions of the inner and outer rings facing each other. Each metamaterial unit 110 is connected to the honeycomb wall by a flexible insulating hinge to ensure mechanical deformation compatibility. A shape memory alloy (SMA) cross-tuning structure 112 is provided between the metamaterial units to adjust the spacing of the metamaterial units.
[0035] The metamaterial unit can be connected to an electric control module and a temperature control module to adjust the square ring 111 and the unit spacing. In one aspect, the metamaterial unit is connected to a piezoelectric ceramic (PZT), the piezoelectric ceramic is connected to a 0-200V DC bias voltage, and the opening width of the square ring 111 is continuously adjusted by the piezoelectric bending effect. In another aspect, the tuning structure 112 deforms under the temperature control of the integrated micro-film heater and thermocouple, adjusts the spacing of the square ring 111, and dynamically adjusts the electromagnetic coupling strength between units.
[0036] In one realizable example, the square ring 111 has an outer ring of 8x8mm and an inner ring of 5x5mm, and under the control of the electric control module, the opening width is continuously adjusted from 0.2mm to 3mm by the piezoelectric bending effect.
[0037] In one realizable example, the spacing between adjacent square rings 111 is 5mm, and by using the temperature control module, the tuning structure 112 made of SMA controls the adjacent square rings 111 to continuously adjust ±2mm, i.e., the adjacent square rings 111 can be compressed to 3mm or expanded to 7mm by the deformation of SMA, forming a reconfigurable periodic array.
[0038] In the above implementation, the electric control module and the temperature control module are used to adjust the square ring 111 and the unit spacing, and further, a sensing module can be introduced into the metamaterial honeycomb structure to monitor the state of the honeycomb, so as to monitor the deformation and temperature distribution of the honeycomb wall in real time. The data is fed back to the control system through the wavelength demodulation module, forming a deformation-electromagnetic parameter closed-loop control.
[0039] In one realizable example, the sensing module includes an FBG optical fiber sensor array, which is embedded in a spiral shape along the honeycomb wall, and three groups of sensors are arranged in each hexagonal unit.
[0040] As shown in Figure 5 a closed-loop control schematic of the control system based on the above structure under the FBG sensor network is given.
[0041] First, the two-way dynamic coupling between the honeycomb matrix and the metamaterial unit: the honeycomb wall thickness adjustment changes the electromagnetic parameters of the base, and at the same time provides mechanical support for the metamaterial unit; the resonance characteristics of the metamaterial unit act on the impedance matching state of the base, and the honeycomb matrix not only serves as the main mechanical bearing body, but also forms a wideband impedance matching base through gradient filling + dynamic deformation, providing an optimized electromagnetic environment for the metamaterial unit. The FBG sensor network Figure 5 in the dashed part) feeds back the deformation to the control system.
[0042] On the other hand, the control system implements system control of multiple physical fields on the metamaterial unit, controls the PZT and the SMA cross structure in the metamaterial unit through the electric control system and the temperature control system in the control system, realizes the PZT fast regulation and control of the main resonance frequency point and the SMA slow adjustment of the bandwidth characteristics, and further realizes time domain cooperation through a control algorithm.
[0043] The control scheme is implemented, and the electromagnetic response characteristics of the metamaterial honeycomb can be controlled. The following will be described in combination with specific experimental measurement examples.
[0044] Experimental example one
[0045] In this experimental example, six 1 groups (according to 1-2-3) of reinforcing rib units 200 are used, and the cavities are filled with silicon carbide reinforced polyurethane wave-absorbing foam (density 0.05-0.3 g / cm 3 Gradually), the L forms a W-shaped impedance distribution;
[0046] The metamaterial unit adopts a 4x4 array, and the initial width of the opening of the square ring 111 resonator is 1.5 mm;
[0047] Electric control parameters: PZT voltage 0-150V; temperature control parameters: SMA temperature 45-100℃;
[0048] FBG optical fiber sensor array arrangement: embedded in a spiral along the honeycomb wall, and 3 groups of sensors are arranged in each hexagonal unit.
[0049] The measurement is carried out when the voltage = 0V and the temperature = 60℃, and the following four peak values are obtained:
[0050] Number Peak position 1 (1.77 GHz, -19.35 dB) 2 (5.91 GHz, -14.31 dB) 3 (10.56 GHz, -9.48 dB) 4 (14.46 GHz, -11.32 dB)
[0051] The test curve is as shown in Figure 6 The reflection loss curve presents a four-peak structure (2 / 6 / 11 / 15 GHz), and after cooperative regulation, the strongest absorption peak position is (1.77 GHz, -19.35 dB) in the low frequency range of 1-2 GHz; the -10 dB bandwidth is 4.3 GHz.
[0052] Experimental example two
[0053] On the basis of the experimental example one, the voltage / temperature is changed, the voltage = 100V / temperature = 60℃, and the test curve as shown in Figure 7 is obtained.
[0054]
[0055]
[0056] The reflection loss curve presents a four-peak structure (2 / 6 / 11 / 15 GHz), and after the coordinated regulation, the strongest absorption peak position is at (5.90 GHz, -24.41 dB) in the range of 4-8 GHz; the voltage regulation makes the 6 GHz peak increase to 24.41 dB, and the peak position is basically unchanged, and the peak strength increases by 10.1 dB; the -10 dB bandwidth is expanded to 8.0 GHz (from 4.3 GHz to 8.0 GHz).
[0057] Experimental Example Three
[0058] On the basis of experimental example one, the voltage / temperature is changed, voltage = 100V / temperature = 90℃. The test curve as shown in Figure 8 is obtained.
[0059] Number Peak position 1 (2.41 GHz, -7.89 dB) 2 (6.33 GHz, -15.57 dB) 3 (10.50 GHz, -32.00 dB) 4 (14.50 GHz, -22.83 dB)
[0060] The test curve is as shown in Figure 8 , the reflection loss curve presents a four-peak structure (2 / 6 / 11 / 15 GHz), and after the coordinated regulation, the strongest absorption peak position is at (10.50 GHz, -32.00 dB) in the range of 8-12 GHz; the temperature coordinated regulation makes the strongest absorption peak position deviate to the range of 8-12 GHz, and the strongest absorption reaches -32.00 dB; the -10 dB bandwidth is expanded to 12.7 GHz (from 8.0 GHz to 12.7 GHz).
[0061] From the electromagnetic response curves of the three experimental examples, it can be seen that by changing the voltage of the access metamaterial unit and the temperature of the shape memory alloy through the electric control module and the temperature control module, the electromagnetic response characteristics of the metamaterial honeycomb can be significantly adjusted, so that the absorption peak position, the strongest absorption intensity, the -10 dB bandwidth and other parameters of the metamaterial honeycomb are adjusted, thereby the metamaterial honeycomb.
[0062] The specific examples in the embodiment can refer to the examples described in the above embodiments and exemplary embodiments, and the embodiment will not be described here.
[0063] Obviously, those skilled in the art should understand that each module or each step of the utility model described above can be realized by a general computing device, which can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, which can be realized by program code executable by a computing device, so that they can be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps among them can be manufactured into a single integrated circuit module to realize. Thus, the utility model is not limited to any specific hardware and software combination.
[0064] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.
Claims
1. A metamaterial honeycomb, characterized by, The application relates to a metamaterial honeycomb, comprising a plurality of honeycomb bases (100) periodically filled with wave-absorbing foam, adjacent honeycomb bases (100) filled with wave-absorbing foam forming a reinforcing rib unit (200), and a metamaterial unit (110) embedded on the side wall of the honeycomb base (100); the metamaterial honeycomb further comprises an electric control module connected with the metamaterial unit and a temperature control module connected with the honeycomb base (100).
2. The metamaterial honeycomb of claim 1, wherein, The reinforcing rib unit (200) comprises honeycomb bases arranged in a triangular number.
3. The metamaterial honeycomb of claim 2, wherein, Adjacent reinforcing rib units (200) are spaced apart by at least one honeycomb base cavity.
4. The metamaterial honeycomb of claim 2, wherein, The honeycomb base (100) is filled with polyurethane wave-absorbing foam with gradually changed density.
5. The metamaterial honeycomb of claim 4, wherein, The density of the polyurethane wave-absorbing foam gradually changes from 0.05 to 0.3 g / cm3.
6. The metamaterial cell of claim 1, wherein, The metamaterial unit (110) is a double-opened square ring (111) arranged in an array.
7. The metamaterial cell of claim 6, wherein, Adjacent metamaterial units (110) are provided with a tuning structure (112), and the tuning structure (112) is connected with the temperature control module.
8. The metamaterial cell of claim 7, wherein, The tuning structure (112) is a cross-shaped structure composed of a shape memory alloy.
9. The metamaterial cell of claim 1, wherein, The electric control module comprises a piezoelectric ceramic connected with the metamaterial unit (110).
10. The metamaterial cell of claim 1, wherein, The temperature control module comprises a thin film heater and / or a thermocouple.
11. The metamaterial cell of claim 1, wherein, The metamaterial honeycomb further comprises a sensing module.
12. The metamaterial cell of claim 11, wherein, The sensing module comprises an FBG optical fiber sensor array embedded in the side wall of the honeycomb base.