Ultrawideband microwave metamaterial absorber with excellent absorption performance and high optical transparency...

Area of Science:

• Materials Science
• Electromagnetics
• Nanotechnology

Background:

• Achieving microwave absorbers with both wideband absorption and high optical transparency is a significant challenge for radar stealth.
• Existing metamaterial absorbers often compromise transparency for performance or vice versa.

Purpose of the Study:

• To propose and demonstrate an ultrawideband metamaterial absorber with excellent absorption and high optical transparency.
• To investigate the design principles and performance characteristics of a novel metamaterial absorber structure.

Main Methods:

• Design of a double-layer mesh metamaterial absorber incorporating indium tin oxide (ITO) and polycarbonate (PC) layers.
• Utilizing an equivalent circuit model (ECM) and genetic algorithm (GA) for parameter optimization.
• Fabrication using laser etching and characterization through simulation and experimental measurements.

Main Results:

• The proposed absorber exhibits an ultrawideband performance with a reflection coefficient below -20 dB from 7.78 GHz to 12.58 GHz (X-band).
• Achieved a relative bandwidth of 47.2% for microwave absorption.
• Maintained an average optical transmittance of 81% in the visible region (400-700 nm).

Conclusions:

• The developed metamaterial absorber successfully combines wideband microwave absorption with high optical transparency.
• The design offers a promising solution for applications requiring both stealth capabilities and visual transparency.
• This work opens new avenues for research in stealth technology and electromagnetic compatibility (EMC).