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

Table 3

Band gaps of single-, dual-, triple-oscillator systems.

	Band gap edges (Hz)	Single-oscillator	Dual-oscillator	Triple-oscillator
The 1st band gap	Lower	846	946	1021
	Upper	1542	1562	1621
The 2nd band gap	Lower	2571	2283	2452
	Upper	2915	2835	2956
The 3rd band gap	Lower	--	4247	3773
	Upper	--	4465	4125
The 4th band gap	Lower	--	--	6103
	Upper	--	--	6257