UHF Metamaterial Absorber with Small-Size Unit Cell by Combining Fractal and Coupling Lines

Table 1

Comparison of the proposed absorber with the earlier published absorber structures.

Absorber	Operating frequency	Unit cell size	Thickness	Polarization insensitive	Ratio
Reference [17]	403.3 MHz	25.2 mm × 25.2 mm	12 mm	No	1/30
Reference [18]	320 MHz	45 mm × 45 mm	15.2 mm	No	1/21
Reference [19]	1.22 GHz	10.92 mm × 10.92 mm	1 mm	Yes	1/22.5
Proposed	2.4 GHz	4.4 mm × 4.4 mm	1.2 mm	Yes	1/28
Proposed	442 MHz	10 mm × 10 mm	9.6 mm	Yes	1/68