| Summary: | 碩士 === 國立彰化師範大學 === 光電科技研究所 === 102 === Abstract
In this paper, we use finite element method to analysis two-dimensional phononic crystal . In our study, we found that our design structure has Extraordinary acoustic transmission (EAT) in low frequency it was produced by the Fabry Perot Like Local Resonance while in high-frequency region it comes from the Structure Factor Resonance, simultaneously accompanied with Wood`s anomalies occur, because of the low frequency EAT is produced by Local Resonance and therefore we can modulate the size of the cavity to control the frequency of EAT, we may modulate the frequency of EAT from 800 kHz to 300 kHz, the frequency change amount to nearly 500 kHz.
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