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

From: Symmetric resonator based tunable epsilon negative near zero index metamaterial with high effective medium ratio for multiband wireless applications

Substructure

Resonance frequency (GHz)

Bandwidth(GHz)

Resonance peak (dB)

Covering bands

Design 1

8.72

1.05

− 48.7

X

Design 2

7.7, 12.7

0.62, 0.4

− 50.9, − 43.9

C, Ku

Design 3

5.26, 17.23

0.21,0.64

− 33.44, − 43.24

C, Ku

Design 4

6.42,14.09

0.33, 0.4

− 42.10, − 33.44, − 14.29

C, Ku

Proposed unit cell

4.20, 10.14, 13.15, 17.1

0.72,1.55,0.17,0.24

− 46.99, − 49.28, − 35.8, − 36.6

C, X, Ku

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