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Ultra-light planar meta-absorber with wideband and full-polarization properties
Optics Express
|March 17, 2021
Summary
This study presents an ultra-broadband, full-polarization planar metamaterial absorber (PMA) for military applications. The lightweight PMA achieves over 90% absorption across 1-18 GHz, outperforming conventional absorbers.
Area of Science:
- Metamaterials
- Electromagnetics
- Materials Science
Background:
- Metamaterial absorbers are crucial for military applications like electronic screening and stealth.
- Existing absorbers suffer from narrow bandwidth, low absorptivity, complex structures, and polarization dependence.
Purpose of the Study:
- To develop an ultra-broadband and full-polarization planar metamaterial absorber (PMA).
- To address the limitations of conventional absorbers for military stealth applications.
Main Methods:
- Designed a three-layer composite structure using ultra-light foams and indium tin oxide (ITO) films.
- Utilized multi-resonant and impedance matching properties for broadband absorption.
- Extracted an equivalent circuit model to elucidate the operating mechanism.
Main Results:
- Achieved >90% absorption across the 1-18 GHz spectrum for full-polarization incident waves.
- Demonstrated insensitivity to oblique incidences and polarizations.
- Developed an ultralight absorber (0.6 kg/m²), significantly lighter than conventional counterparts.
Conclusions:
- The developed PMA exhibits excellent broadband, full-polarization absorption and ultralight characteristics.
- The device is a promising candidate for military stealth materials.
- The findings offer a significant advancement over existing metamaterial absorbers.
