An X-shaped triple split ring resonator-based metamaterial perfect absorber with quad-band incident and polarization angle insensitivity for C, X, and Ku band applications

In this study, an X-shaped triple split ring resonator-based metamaterial perfect absorber with quad-band incident and polarization angle insensitivity for C, X, and Ku band applications has been proposed. The metamaterial perfect absorber consists of a prearrangement with metallic patch, metal ground plane and a middle Rogers RT5870 dielectric substrate with 1.575 mm thickness. The numerical methods implemented using finite integration technology (FIT) demonstrate that the metamaterial perfect absorber (MPA) exhibits an absorption capacity exceeding 99% in all frequency bands, precisely matching the impedance of free space. These frequency bands are located at 4.37 GHz, 7.08 GHz, 9.38 GHz, and 10.65 GHz with the absorption levels of approximately 99.8%, 99.9%, 99.9%, and 99.9% respectively for both transverse electric (TE) and transverse magnetic (TM) modes. Additionally, the MPA demonstrates quality factors of 21.92, 7.2, 13.42, and 15 for both modes. The investigation of the electromagnetic (EM) field with surface current distribution has provided information about the mechanism of such quad-band absorbance. The numerical analysis reveals that the metamaterial perfect absorber (MPA) can achieve remarkable absorbance outcomes across a wide range of incident angles, up to 800s, while also being insensitive to polarization up to 300 for both modes. A comparable circuit analysis demonstrates the superior performance of the MPA, indicating its potential for excellent functionality within the advanced design system (ADS) software. Furthermore, the suggested structures, modelled using the high-frequency structure simulator (HFSS), closely align with the maximum absorbance observed at each resonance peak in the computer simulator technology (CST) simulator results. The proposed MPA possesses high-performance characteristics that enable its application in various domains such as satellite communications, raw satellite feeds, and radar systems.