A Central Spiral Split Rectangular-Shaped Metamaterial Absorber Surrounded by Polarization-Insensitive Ring Resonator...

Area of Science:

• Electromagnetics and Metamaterials
• Microwave Engineering
• Materials Science

Background:

• Metamaterial absorbers are crucial for controlling electromagnetic wave interactions.
• S-band applications require efficient absorption at specific frequencies.
• Polarization-insensitive designs enhance device robustness.

Purpose of the Study:

• To design and analyze a novel metamaterial absorber for S-band applications.
• To achieve high absorption rates with a polarization-insensitive unit cell.
• To investigate the electromagnetic properties and potential applications of the proposed absorber.

Main Methods:

• A central spiral split-rectangular metamaterial absorber was designed.
• Simulations were performed using FR-4 and Rogers4450B substrates.
• S11 and S21 parameters were analyzed across various polarization angles.
• Permittivity, permeability, and reflective index were evaluated.

Main Results:

• Achieved 99.9% absorption at 3.1 GHz with an FR-4 substrate.
• Demonstrated high absorption rates (up to 99.91%) with Rogers4450B across S- and C-bands.
• Observed near-zero reflective indexes (NZRI) suitable for antenna gain.
• The unit cell exhibited epsilon-negative (ENG) and single-negative (SNG) metamaterial properties.

Conclusions:

• The proposed metamaterial absorber effectively achieves ultra-high absorption in the S-band.
• The polarization-insensitive design ensures consistent performance across different incident angles.
• The near-zero reflective index property opens avenues for advanced antenna applications.
• The absorber is suitable for low-frequency radar detection systems.