期刊
JOURNAL OF SOUND AND VIBRATION
卷 353, 期 -, 页码 58-74出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2015.05.012
关键词
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资金
- National Research Foundation of Korea (NRF) Grant - Korean Ministry of Science, ICT and Future Planning (MSIP) contracted through IAMD at Seoul National University [2014-021950 (2015-021967), 2014M3A6B3063711]
- Korea Institute of Machinery and Materials
In this study, we propose a novel impedance-vaiiation scheme in a half-quarter-wave stack (HQWS) structure to achieve desired bandpass filtering performances such as quasi-flat tops, steep bandedges and wide surrounding bandgaps. Specifically, only the characteristic impedances of constituent half-wave layers are varied without altering the phase shift of it at the center frequency of the target passband that is the Fabry-Perot resonance frequency of the unperturbed original HQWS structure. Because the simultaneous control of characteristic impedance and phase shift in each of the constituent half-wave layers is not achievable only by layer-sizing, the varied layers must be realized by metamaterials. So, specially-configurecl aluminum-based metamaterials having a double-slit void inhomogeneity are engineered and the actual wave transmission performance of the metamaterial-realized HQWS structure is examined numerically and experimentally. (C) 2015 Elsevier Ltd. All rights reserved.
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