An Ultrathin Polarization Free Asterick-Shaped Metamaterial Absorber with Quad-Band Characteristics

Table 1

Effective material parameters obtained at peak absorption frequencies.

Abs. freq. (GHz)	Permittivity (εeff)		Permeability (μeff)
	Real	Imaginary	Real	Imaginary
3.1	1.34	3.48	−10.67	6.77
5.42	0.05	3.54	−0.39	0.99
16.65	0.009	0.69	0.46	0.98
17.56	−0.55	1.78	−0.97	0.59
20.29	0.66	1.55	−0.68	0.20

Abs. freq. = Absorption frequency.