Tuning fork-hammer shaped perfect metamaterial absorber for C-band applications

The new compact octagonal split ring resonator with octagonal close ring resonator-based tuning fork-hammershaped metamaterial is a perfect metamaterial absorber (PMA) for C-band application. It is a new arrangement of two octagonal ring resonators with tuning fork-hammer shaped metal strips that are fabricated using FR-4 dielectric material. The numerical results obtained from the Computer Simulation Technology (CST) microwave studio exhibited dual resonance peaks at 4.34 GHz and 5.35 GHz with the absorption of 99.98% and 98.31%, respectively for transverse electric (TE) mode. The obtained numerical results were also authenticated using the high-frequency structure simulator (HFSS) simulator, an equivalent circuit model which shows a very insignificant amount of variation. Agilent N5227 Vector Network Analyzer was also used for measurement in this study. A slight variation at all peak points was observed when the simulation and measurement data were compared. Absorption individualities were also analysed using different polarisation angles and incident angles for TE mode. The projected absorber demonstrated near unity absorptions up to 30 degrees polarisation angle and 60 degrees wide incident angle. The proposed design was optimised using different types of parametric studies such as unit cell configurations, split gap, and width of the octagonal ring resonator. This C-band absorber is frequently used in satellite communication band, defence, security, and stealth coating equipment.