Table 2.

Real values of ε, μ, and η in the resonance frequency band for the unit cell and array configuration at 0-degree and 90-degree rotation.

Structure	Frequency (GHz)	Rotation Angle	Value of Permittivity (ε)	Value of Permeability (μ)	Value of Refractive Index (η)	Refractive Index Bandwidth	Metamaterial Type
Unit cell	8.79	0-degree	−8.35	−34.04	−16.92	3.61 GHz	DNG
		90-degree	−6.43	−34.16	−24.91	3.57 GHz
1 × 1 Array	8.60	0-degree	−5.45	−29.83	−13.19	3.96 GHz	DNG
		90-degree	−2.31	−35.08	−9.06	4.05 GHz
2 × 2 Array	8.60	0-degree	−0.68	−45.04	−5.55	2.68 GHz	DNG
		90-degree	−2.63	−34.47	−9.53	3.90 GHz
4 × 4 Array	8.60	0-degree	−4.17	−31.75	−12.80	4.10 GHz	DNG
		90-degree	−4.66	−31.01	−12.94	3.74 GHz