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In this letter, large band gap properties of a two-dimensional stop band gap system composed of steel tubes are reported, which are embedded with periodic narrow slits in each half of the annular tube. The band gap with finite thickness samples is experimentally investigated and theoretically calculated. The results show that without enlarging the lattice constant, the starting frequency of the band gap is reduced, and using the periodic narrow slits with multiwidth can enlarge the stop band of this system due to the multicavity resonance.
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Cui et al. (2008) studied this question.
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