Table 2 Transmission Coefficient (S21) of successive steps for the proposed unit cell.

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

Substructure

Resonance frequency (GHz)

Resonance peak (dB)

Covering bands

Step 1

6.66

− 39.37

C

Step 2

6.36, 9.05

− 30.54, − 33.39

C

Step 3

5.47, 8.91, 11.26

− 44.96, − 31.64, − 34.28

C, X

Step 4

7.04, 8.57, 11.97

− 12.77, − 13.27, − 23.89

C, X

Proposed unit cell

3.94, 8.08, 11.17

− 25.10, − 18.44, − 17.88

S, C, X

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