Key Takeaways & Executive Findings
- •• A multiscale hierarchical structure integrating wrinkled MXene IR shielding layer and flexible Fe3O4@C/PDMS microwave absorption layer achieves radar-IR compatible stealth. • The stealth device exhibits near-perfect stealth in X-band (8-12 GHz) and long-wave infrared (8-14 µm) with RCS reduction of -20 dB m2 and average IR emissivity of 0.35. • The device demonstrates multifunctionality including curved surface conformability, self-cleaning (contact angle ≈ 129°), and abrasion resistance (recovery time ≈ 5 s). • The design strategy leverages magneto-dielectric synergy and multiscale hierarchical structure to overcome conflicting microwave and IR cloaking mechanisms.
Abstract
Developing advanced stealth devices to cope with radar-infrared (IR) fusion detection and diverse application scenarios is increasingly demanded, which faces significant challenges due to conflicting microwave and IR cloaking mechanisms and functional integration limitations. Here, we propose a multiscale hierarchical structure design, integrating wrinkled MXene IR shielding layer and flexible Fe3O4@C/PDMS microwave absorption layer. The top wrinkled MXene layer induces the intensive diffuse reflection effect, shielding IR radiation signals while allowing microwave to pass through. Meanwhile, the permeable microwaves are assimilated into the bottom Fe3O4@C/PDMS layer via strong magneto-electric synergy. Through theoretical and experimental optimization, the assembled stealth devices realize a near-perfect stealth capability in both X-band (8–12 GHz) and long-wave infrared (8–14 µm) wavelength ranges. Specifically, it delivers a radar cross-section reduction of −20 dB m2, a large apparent temperature modulation range (ΔT = 70 °C), and a low average IR emissivity of 0.35. Additionally, the optimal device demonstrates exceptional curved surface conformability, self-cleaning capability (contact angle ≈ 129°), and abrasion resistance (recovery time ≈ 5 s). This design strategy promotes the development of multispectral stealth technology and reinforces its applicability and durability in complex and hostile environments.
1. Introduction
Continuous innovation and development in various military reconnaissance methods is driving the expansion of electronic surveillance equipment into the broader electromagnetic (EM) spectrum from visible to microwave ranges [1, 2]. The emergence of multispectral compatible stealth technology, especially radar-infrared (IR) compatible stealth, has enabled military equipment to evade dangerous and seamless reconnaissance signals at over-the-horizon ranges, thereby greatly improving their survivability and combat effectiveness [3]. Nevertheless, there is a conflict between the two camouflage mechanisms in terms of EM characterization requirements. Radar stealth requires low reflection and high absorption, while IR stealth requires high reflection and low radiation, which poses a significant challenge for material and structure design [4, 5].
In general, the prevailing strategies for compatibility camouflage typically involve the assembly of composite materials, the establishment of multilayer film response mechanisms, and the design of metamaterial structures [6–8]. Multiscale hierarchical structure design can leverage different scale structures to interact with electromagnetic waves (EMWs) at specific wavelengths, and then integrate multi-band EM responses in a single device to achieve radar-IR compatible stealth. In practice, stealth devices also need to have additional functionality to meet some complex and extreme operating environments, such as flexibility to fit on the curved surfaces in the core components, superhydrophobicity to hinder liquid infiltration to achieve self-cleaning, and abrasion resistance to enhance service life. Indeed, exploring radar-IR compatible stealth devices integrating multiple functional characteristics is in high demand and remains a daunting task.
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Chen Li, Leilei Liang, Baoshan Zhang, Yi Yang, Guangbin Ji (2024). Magneto-Dielectric Synergy and Multiscale Hierarchical Structure Design Enable Flexible Multipurpose Microwave Absorption and Infrared Stealth Compatibility. Nano-Micro Letters. https://doi.org/10.1007/s40820-024-01549-4
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Frequently Asked Questions
What is the main challenge in radar-infrared compatible stealth?
The main challenge is the conflicting electromagnetic requirements: radar stealth needs low reflection and high absorption, while infrared stealth needs high reflection and low radiation, making it difficult to achieve both in a single material or structure.
How does the multiscale hierarchical structure achieve radar-IR compatible stealth?
The structure integrates a wrinkled MXene layer that shields infrared radiation via diffuse reflection while allowing microwaves to pass through, and a Fe3O4@C/PDMS layer that absorbs microwaves via magneto-dielectric synergy, enabling near-perfect stealth in both X-band and long-wave infrared.
What are the key performance metrics of the stealth device?
The device achieves a radar cross-section reduction of -20 dB m2, a large apparent temperature modulation range (ΔT = 70 °C), and a low average IR emissivity of 0.35, along with excellent flexibility, self-cleaning (contact angle ≈ 129°), and abrasion resistance.
What additional functionalities does the stealth device possess?
The device exhibits exceptional curved surface conformability, self-cleaning capability due to superhydrophobicity, and abrasion resistance with a recovery time of about 5 seconds, making it suitable for complex and hostile environments.
What is the significance of magneto-dielectric synergy in this design?
Magneto-dielectric synergy enhances microwave absorption by combining magnetic loss from Fe3O4 and dielectric loss from carbon, leading to improved impedance matching and attenuation, which is crucial for effective radar stealth.
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