The equivalent circuit modeling has been accomplished using Advanced Design Software (ADS) that shows a similar S 21 response compared to CST simulation. The performance of the array of the unit cells is also investigated in both simulation and measurement. The simulated result is validated by experiment with good agreement between them. The MTM unit cell exhibits six resonances of transmission coefficient (S 21) at 2.38, 4.24, 5.98, 9.55, 12.1, and 14.34 GHz covering S, C, X, and Ku-bands with epsilon negative (ENG), near-zero permeability, and near-zero refractive index (NZI). Numerical simulation software CST microwave studio is used for the simulation and performance analysis of the proposed unit cell. The resonance frequency is tuned by adding inductive metal strips in parallel two vertical splits of the outer ring that causes a significant shift of resonances towards the lower frequencies and a highly effective medium ratio (EMR) of 15.75. The resonator part is a combination of three squared copper rings and one circular ring in which all the square rings are modified shaped, and the inner two rings are interconnected. The MTM is designed on an FR-4 substrate with a thickness of 1.5 mm and an electrical dimension of 0.063λ × 0.063λ where wavelength, λ is calculated at 2.38 GHz.
An inductively tuned modified split-ring resonator-based metamaterial (MTM) is presented in this article that provides multiple resonances covering S, C, X, and Ku-bands.