Holy cross-moon shaped dual band perfect metamaterial absorber for C-band application

Abstract

In this paper, a dual band electromagnetic perfect metamaterial absorber (PMA) is presented for C-band application. This new design comprises of a moon shape and a holy cross shape metal bar which are surrounded by a circular ring resonator (CRR) and an octagonal close ring resonator (OCRR). Flame retardant 4 dielectric material of thickness 1.6 mm is used as a substrate. Commercially available high frequency electromagnetic simulator CST microwave studio used to simulate the proposed unit cell within the frequency range 2–6 GHz. The numerical simulation shows two resonance peaks at 4.10 GHz and 4.96 GHz with excellent absorption rate. The projected PMA exhibits maximum absorption of 99.99 % (4.10 GHz) and 99.57 % (4.96 GHz) in transverse electric (TE) mode at normal incidence angle. The structure of the unit cell was optimized through some recognized parametric studies like design optimization, resonators widths, gaps among resonators etc. The numerical results for 2 × 2 and 4 × 4 arrays are also investigated. The simulated result of 2 × 2 array shows resonance at 4.14 GHz and 4.98 GHz with absorptivity of 99.06 % and 99.58 %, respectively whereas 4.12 GHz and 4.69 GHz with absorptivity of 92.35 % and 97.62 %, respectively for 4 × 4 array. These two results are quite resembled with the unit cell result. The extracted numerical results are tested and authenticated by some validation processes as equivalent circuit modeling through ADS software, and different electromagnetic simulator such as high-frequency structure simulator (HFSS) which is revealed an unimportant disparity. The offered perfect metamaterial absorber is fit for satellite communication, stealth-coating technology, defense and security uses.