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

Table 2

Comparison of the proposed work with recently reported MTM-based absorbers.

(References)	Lowest absorption frequency (LAF) (GHz)	Unit cell size (mm^2)	Unit-cell size with respect to LAF (λ0)	Thickness with respect to LAF (λ0)	Number of bands	Polarization independent
[11]	3.25	11 × 11	0.119	0.0112	3	Yes
[12]	2.29	30 × 30	0.229	0.015	3	Yes
[13]	1.8	34.8 × 34.8	0.209	0.0294	3	Yes
[14]	4.11	15 × 15	0.205	0.013	4	Yes
[15]	4.34	20 × 20	0.289	0.011	4	Yes
[16]	5.984	17 × 17	0.339	0.024	5	No
[17]	11.4	10 × 10	0.380	0.0038	3	No
[23]	2.24	20 × 20	0.149	0.0112	4	Yes
This work	3.1	10 × 10	0.103	0.0103	4	Yes