Investigation on the Band Gap and Negative Properties of Concentric Ring Acoustic Metamaterial

Table 1

Scatterer dimensions.

	(mm)	(mm)	(mm)	(mm)	(mm)	(mm)
Single-oscillator	2.83	4.00	--	--	--	--
Dual-oscillator	2.00	2.67	3.33	4.00	--	--
Triple-oscillator	1.63	2.09	2.65	3.11	3.54	4.00

Note. to are the radii from inner to outer layers of scatters.