Sub-wavelength Structural Material for Multi-Spectral Stealth
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Solution Overview
Problem
Current materials struggle to achieve compatibility of low detectability for infrared, laser, and microwave bands due to contradictory requirements of strong absorption and low reflection in different spectral ranges, particularly between microwave and infrared bands.
Innovation Solution
A sub-wavelength structural material comprising a metal type frequency selective surface layer, dielectric layers, and a resistive film layer, where the metal frequency selective surface layers with low infrared emissivity and patch arrays achieve low detectability for laser and infrared, while the dielectric and resistive layers ensure microwave absorption, thereby addressing the contradictory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If strong absorption and low reflection are implemented for microwave band, then microwave absorption is improved, but infrared reflection deteriorates
Solution Approach 1:
The material is divided into multiple functional layers including metal frequency selective surface layers, dielectric layers, and resistive film layers. Each layer segment performs a specific function: metal layers handle microwave absorption, dielectric layers provide thermal management, and resistive layers contribute to both microwave absorption and infrared reflection control, thereby resolving the contradiction between microwave absorption and infrared reflection
Solution Approach 2:
Different layers are assigned different material properties and functions tailored to specific spectral requirements. The metal frequency selective surface layers have properties optimized for microwave absorption, while the dielectric and resistive layers are configured to control infrared reflection, allowing each local region of the material to excel at its designated spectral band without compromising overall performance
2Loss of energy
If strong absorption is implemented for laser band, then laser absorption is improved, but infrared detectability deteriorates
Solution Approach 1:
The material structure is segmented into layers that differentially interact with laser and infrared radiation. The metal frequency selective surface layers and resistive film are configured to absorb laser wavelengths while the dielectric layers and overall structure are designed to reflect infrared wavelengths, allowing simultaneous optimization for both laser absorption and infrared stealth
Solution Approach 2:
The optical properties of the material layers are carefully controlled by adjusting parameters such as layer thickness, material composition, and structural geometry. These parameter changes enable the material to exhibit wavelength-selective behavior, absorbing laser radiation while maintaining low infrared emissivity and high infrared reflection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The material effectively realizes stealth for both infrared and laser, integrating low detectability across all three spectral ranges with a simple and thin structure, enhancing compatibility and reducing radar cross-section.
Implementation Method 1
the metal type frequency selective surface layer I, the dielectric layer I and the metal type frequency selective surface layer II are used to realize low detectability for laser and infrared
Implementation Method 2
the wavelength patch type array of the metal type frequency selective surface layer I has different patches having a reflection phase difference, so that effective scattering for incident infrared waves is realized by combining the different patches
Implementation Method 3
a dielectric layer II disposed below the metal type frequency selective surface layer II, a resistive film layer disposed below the dielectric layer II and a dielectric layer III disposed below the resistive film layer, wherein the dielectric layer II, the resistive film layer, the dielectric layer III, and a metal reflective plate are used to realize absorption of microwaves
Implementation Method 4
a resistive film layer disposed below the dielectric layer II
Data Source
AI summary
The present disclosure provides a sub-wavelength structural material having compatibility of low detectability for infrared, laser, and microwave, which includes, from top to bottom, a metal type frequency selective surface layer I, a dielectric layer I, a metal type frequency selective surface layer II, a dielectric layer II, a resistive film, a dielectric layer III. Each of the metal type frequency selective surface layers is a sub-wavelength patch type array, and metal used by the metal type frequency selective surface layers has a characteristic of low infrared emissivity. The present disclosure modulates a phase by using a phase difference generated by patches with different sizes on the metal type frequency selective surface layer I, so as to control backscattering of incident electromagnetic waves to achieve compatibility of low detectability for laser and infrared, while the bottom three layers achieve absorption of microwave.