Incident Angle- and Polarization-Insensitive Metamaterial Absorber using Circular Sectors.

Area of Science:

• Electromagnetics
• Materials Science
• Nanotechnology

Background:

• Metamaterials offer unique electromagnetic properties.
• Efficient absorbers are crucial for various applications, including radar and communication systems.
• Existing absorbers often struggle with wide-angle and polarization insensitivity.

Purpose of the Study:

• To design and demonstrate an incident angle- and polarization-insensitive metamaterial absorber for X-band applications.
• To achieve high absorptivity over a broad range of frequencies and incidence conditions.
• To validate simulation results with experimental measurements.

Main Methods:

• A novel unit cell design featuring a central square patch and four rotated circular sectors was proposed.
• Full-wave electromagnetic simulations were employed to analyze the absorber's performance.
• Experimental measurements were conducted to verify the simulated results.

Main Results:

• The proposed metamaterial absorber exhibits absorptivity higher than 90% for incident angles up to 70°.
• The absorber demonstrates polarization-insensitivity for both transverse electric (TE) and transverse magnetic (TM) modes.
• Simulated frequency variation was less than 0.96% for optimal configurations.
• Measured absorptivity reached nearly 100% at 10.44 GHz under normal incidence.

Conclusions:

• The developed metamaterial absorber effectively overcomes limitations of angle and polarization sensitivity.
• The design shows significant potential for practical X-band applications requiring robust electromagnetic absorption.
• The study validates the efficacy of the proposed unit cell structure through simulation and measurement.