3D metamaterial ultra-wideband absorber for curved surface

Area of Science:

• Electromagnetics
• Materials Science
• Metamaterials

Background:

• Metamaterial absorbers are crucial for wave manipulation.
• Existing absorbers often lack broadband performance or are unsuitable for curved surfaces.
• Developing cost-effective and lightweight absorbers is essential for practical applications.

Purpose of the Study:

• To propose a novel 3D metamaterial absorber for broadband absorption.
• To design a low-cost, lightweight absorber suitable for curved surfaces.
• To investigate the absorption mechanisms and performance under various conditions.

Main Methods:

• A three-dimensional metamaterial absorber structure based on a resistive film patch array was designed and simulated.
• Absorption performance was analyzed for both transverse electric (TE) and transverse magnetic (TM) polarizations at normal and oblique incidence.
• Electromagnetic field distributions (E-field, surface current) and power loss density were calculated to understand the absorption mechanisms.

Main Results:

• The proposed absorber achieves broadband absorption exceeding 85% over the 35-400 GHz frequency range.
• Absorption bandwidths of over 167% and 80% were achieved for absorption above 85% and 90%, respectively.
• The absorber demonstrates polarization independence and wide-angle stability (up to 60° for TE, 90° for TM).

Conclusions:

• The metamaterial absorber effectively utilizes resistive films and magnetic dipole resonances for broadband absorption.
• The design is polarization-independent and robust against wide-angle incidence, making it suitable for curved surfaces.
• This work offers a promising platform for terahertz, infrared, and optical applications in sensing, imaging, and stealth technology.