Title: New design of quad-band polarisation-insensitive metamaterial absorber based on dual-T shaped resonator array for C-, X- and Ku- bands microwave applications

Abstract

Multi-band metamaterial absorbers (MMAs) are increasingly becoming the main devices for many electrical systems. Optimizing the electromagnetic qualities of this type of absorber in the microwave regime is a relatively complex operation. In this paper, a quad-band Metamaterial Absorbent MMA covering the microwave bands is provided. The proposed MMA for analysis and design is formed by an (16×16) array of metamaterial base cells. Each cell has an interconnected circular T-C shaped split ring resonator (CTC-SRR) etched on the top face of FR4_Epoxy substrate for electrical dimensions (0.18λ_0× 0.18λ_0) where λ_0 is calculated at the lower frequency of 4.6 GHz in the C-band. The electromagnetic qualities of our MMA are expired by the behavior of each basic cell which represents a left hand medium and a negative permeability (μ<0) for magnetic resonances at the frequencies 4.6 GHz, 9.2 GHz, 11.3 GHz and 15.8 GHz. The obtained results simulations performed by the High-Frequency Structure Simulator (HFSS) computer show an insensitive-polarization quad-band behavior for our proposed MMA. The spectral responses of the absorber cover the C-, X- and Ku-bands for important absorption coefficients of the order of 96.22%, 93.25%, 98.46% and 92.37%.