High-Performance Tri-Band Metamaterial Absorber for Polarization-Insensitive EMI Shielding in Microwave Communication...

Area of Science:

• Electromagnetics
• Materials Science
• Metamaterials

Background:

• Metamaterial absorbers are crucial for microwave attenuation and electromagnetic shielding.
• Existing designs often face limitations in bandwidth, profile, or angular stability.

Purpose of the Study:

• To develop a low-profile, tri-band metamaterial absorber for S-, C-, and X-band applications.
• To achieve high absorption efficiency (>99%) and stable performance under various conditions.

Main Methods:

• Numerical optimization of a compact resonant topology with metallic ring and decagonal resonators.
• Analysis of absorption mechanisms via field localization, current distribution, and impedance characteristics.
• Experimental validation using a fabricated prototype and free-space characterization.

Main Results:

• Three distinct absorption bands exceeding 99% absorptivity at 3.6 GHz, 7.4 GHz, and 11 GHz.
• Demonstrated stable operation for polarization states and incident angles up to 60°.
• Measured results closely matched simulation predictions, confirming design effectiveness.

Conclusions:

• The developed metamaterial absorber exhibits excellent performance for microwave attenuation and shielding.
• Its compact size, high efficiency, and angular stability make it suitable for electromagnetic compatibility, shielding, and radar applications.