Browsing by Author "Faysal, Mohammed"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Design and Analysis Co Polarization Insensitive Metamaterial Absorber for C, X and Ku Band Applications
    (International Islamic University Chittagong, 2024-02) Faysal, Mohammed
    This study proposes a metamaterial absorber (MMA) based on rotational symmetry to design a wide angle, polarization-insensitive wireless system for S, C, X, and Ku bands. The MMA comprises electric ring resonators (ERR) arranged in a single layer with four-fold interconnected rotational symmetry, fabricated using FR-4 substrate. In the frequency range of 4 to 18 GHz, the MMA shows five distinct absorption peaks. Notably, absorption levels at 4.882 GHz, 6.464 GHz, 7.882 GHz, 11.3 GHz, and 17.216 GHz reach 99.3%, 94.9%, 94.5%, 98.7%, and 92.5%, respectively. The compact unit cell, with dimensions of 0.162λ×0.162λ×0.026λ at 4.882 GHz, achieves 99% mean absorptivity. Furthermore, the MMA exhibits stable absorption characteristics across azimuth and elevation angles (phi= 0 to 90 degrees, Theta = 0 to 60 degrees). Resonances demonstrate near-zero or negative refractive index traits, offering tunable multifunctionality. The MMA's compactness, high effective medium ratio (EMR), negative permittivity, permeability, and near-zero refractive index make it suitable for various wireless applications, enhancing gain and antenna directivity in fixed-mobile and multiband scenarios.