Table 3 Response of S21, permittivity, and refractive index of the structure.

From: Polarization insensitive split square ring resonator based epsilon-negative and near zero refractive index metamaterial for S, C, and X frequency bands satellite and radar communications

Parameter

Frequency range (GHz)

Extracted property

Transmission coefficient (S21)

3.82–4.25, 7.26–8.03, 10.13–11.36

|S21|< − 10 dB

Permittivity, (ϵ)

3.8–4.17, 7.68–8.54, 10.68–11.38

ϵ < 0

Nera Zero Refractive index, (n)

4.07–4.15 8.29–8.37

n ≈ 0

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