Abstract
Noise pollution is a challenging issue requiring the development of acoustic systems that can reduce noise. Besides the environmental impacts of noise pollution, it can cause serious health problems. This work originally discusses noise reduction using a new configuration of side branches grafted in series with different terminations. The combination of two serial resonators shows acoustic coupling effects. This effect is used to increase localized modes of two serial defective resonators located in the middle of the structure. The transmission of acoustic waves can be controlled by the dimensions of the introduced defects as well as their boundary conditions. We also show that defects can totally filter the transmission of the pass-bands. The proposed structure can then play the role of an acoustical filter.
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