Back to Back C Shaped Rotational Symmetric Metamaterial Absorber for Triple Band Applications

This work presents a back-to-back C-shaped rotating symmetric polarization-insensitive metamaterial absorber (MMA) for triple band (C, X, and Ku) applications. The findings demonstrate that the absorption rate is constant regardless of the co- and cross-polarization angle. With maximum absorptions of 93%, 94%, 99.84%, and 97%, respectively, the study shows resonance frequency with single negative (SNG) MM characteristics at frequencies of 5.552, 6.432, 11.568, and 16.496 GHz. The absorber exhibits polarization insensitivity, marking a significant advancement in versatile electromagnetic wave absorption technologies. Rigorous simulations conducted in CST revealed a fascinating trend of a near-zero effective refractive index, permeability, and permittivity at specific frequencies. Due to its superior absorption qualities and clear construction compared with recent work on MM, this absorber has a special function in satellite communications, Wi-Fi, WLAN, medical imaging, radio astronomy, and radar applications, outperforms more current, comparable works using FR4 substrate.