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Ultra-wideband optically transparent radar-absorbing composite metastructure with embedded multilayer frequency
Optics Express
|May 4, 2026
Summary
This study presents a novel optically transparent radar-absorbing composite metastructure (OTRACM) that achieves wideband radar absorption while maintaining high visible-light transmittance. The OTRACM technology offers significant potential for stealth applications and electronic device protection.
Area of Science:
- Metamaterials and Metasurfaces
- Electromagnetic Wave Absorption
- Optical Transparency
Background:
- Existing transparent metamaterial absorbers (MMAs) struggle to balance low-frequency wideband radar absorption with high optical transparency.
- There is a need for advanced materials that can mitigate electromagnetic interference without compromising visual access.
Purpose of the Study:
- To develop a multi-objective optimization approach for designing optically transparent radar-absorbing composite metastructures (OTRACM).
- To achieve a material that exhibits low reflectivity across a broad radar frequency spectrum while maintaining high visible-light transmittance.
Main Methods:
- Utilized a multi-objective genetic algorithm coupled with a hexagonal electromagnetic model and skewed periodic boundaries.
- Employed a 3D-printed framework-assisted resin infusion method for fabricating OTRACM.
- Incorporated functional units with multilayer quartz glass thin plates and patterned indium tin oxide (ITO) hexagonal ring frequency selective surfaces (PFSS).
Main Results:
- Achieved reflectivity below -10 dB across 2.3–18 GHz.
- Demonstrated 72.33% visible-light transmittance.
- Effective absorption bandwidth covers S, C, X, and Ku bands.
- Exhibited multi-angle stability for TE and TM polarizations up to 45° incidence angles.
Conclusions:
- The developed OTRACM successfully reconciles wideband radar absorption with high optical transparency.
- The material shows significant potential for applications in military stealth, electromagnetic information security, and civilian electronic device protection.
