SRR inspired modified psi shaped perfect metamaterial absorber for C-band application

Abstract

In this research article, a compact and simple design of polarization insensitive perfect metamaterial absorber (PMA) is offered. The design is optimized to target the two mid frequencies of C-band for satellite communication. This novel design is a congress of two modified psi shaped resonators which are surrounded by a split ring resonator (SRR) and an octagonal split ring resonator (OSRR). Dielectric material FR-4 of loss tangent 0.025 and thermal conductivity 0.3 WK-1m−1 is used as substrate whereas the copper (annealed) of thermal conductivity 401 WK-1m−1 and electrical conductivity 5.8 × 107 Sm−1 is used for back copper plate and resonators. This is a compact unit cell of electrical dimension 0.268λ × 0.268λ with 1.6 mm thickness of dielectric substrate and 0.035 mm thickness of bottom copper sheet. The proposed PMA is simulated within the microwave frequency range 5 GHz to 10 GHz with commercially available FIT based high-performance3D EM analyserCST microwave studio suite. The simulation result yields two resonance peaks at 6.15 GHz and 7.36 GHz with fantastic absorption rate 99.99% and 99.40%, respectively. The presented PMA shows polarization insensitivity up to 45° and oblique wide angle incidence up to 75°. Moreover, the simulated outcome is validated by some trusted validation processes; for example- equivalent LC circuit by advanced design software (ADS) and FEM based high-frequency structure simulator (HFSS). A very negligible amount of deviation of resonance frequencies are observed in ADS and HFSS results compared to CST simulated result. Different types of array combinations are also simulated to test the stability of the result and to check the coupling effect. This C-band PMA is recurrently deployed in satellite communication band, defense, security, and stealth coating equipment.