Wide-incident-angle, polarization-independent broadband-absorption metastructure without external resistive elements...

Area of Science:

• Electromagnetics
• Materials Science
• Metamaterials

Background:

• Broadband electromagnetic wave absorption with polarization and incidence-angle independence is crucial for modern technologies.
• Existing metamaterial absorbers often involve complex structures, specialized materials, or external resistive components.

Purpose of the Study:

• To present a simple, effective metasurface structure for high broadband electromagnetic wave absorption.
• To demonstrate polarization insensitivity and wide-angle performance of the proposed metasurface.

Main Methods:

• Fabrication of a metasurface using standard printed-circuit-board techniques.
• Design of unit cells with 4 symmetric substructures and a metallic bar pattern for planar resistive interaction.
• Analysis, simulation, and experimental measurement of absorption performance.

Main Results:

• Achieved absorption above 90% in a broadband frequency range (12.35–14.65 GHz).
• Demonstrated polarization insensitivity and maintained high absorption (>90%) up to 45° incident angles.
• The metasurface utilizes a planar resistive interaction without requiring actual resistive components.

Conclusions:

• The proposed metasurface offers a simple and effective solution for broadband electromagnetic wave absorption.
• The design principles are fundamental and adaptable for absorbers at various frequencies.
• Further improvements in design and fabrication can enhance absorption performance.