2014 Fiscal Year Final Research Report
Planar acoustic filter using Helmholtz resonators
| Project/Area Number |
25630075
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Dynamics/Control
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Research Collaborator |
ISOZAKI Akihiro 東京大学, 大学院理学系研究科, 特任研究員 (10732555)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Keywords | ヘルムホルツ共鳴器 / ノッチフィルタ / 音響フィルタ |
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| Outline of Final Research Achievements |
The developed acoustic filter consists of a number of spherical Helmholtz resonators (HRs), which are placed at the in-plane vertices of a regular polygon. A simulation result reveals that this uniform arrangement of HRs improves the silencing effect because the uniform applied waves emitted from the HRs act as canceling waves to the cross-section of the short hole. The total pressure emitted from the HRs is equal regardless of the number of HRs connected to the hole. Therefore, the arrangement of HRs is essential for realizing a planar notch filter. Simulated transmittance spectra demonstrated that the depth of the dip in the transmittance increases with the number of uniformly arranged HRs. It is confirmed that the experimental results with the fabricated filters, which consist of between one and six HRs, agrees with the simulated transmittance spectra.
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| Free Research Field |
MEMS
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