Essential role of impedance in the formation of acoustic band gaps

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We investigate acoustic band gaps (ABGs) in a two-dimensional lattice of cylinders for the cases of constant impedance, Z, and constant velocity, v. ABGs become wider for the case of constant v (varying Z), and become smaller, eventually disappearing in the opposite case. As the volume fraction increases, the upper (bottom) edge of the stop band increases (decreases) and then decreases (increases) in composites with impedance variation only, so that the midgap frequency changes very little and a larger ABG can be created. The upper (bottom) edge of the stop band increases (decreases) when the impedance ratio increases, so that the midgap frequency decreases slightly and the size of the ABG increases. (C) 2000 American Institute of Physics. [S0021-8979(00)01004-5].
Publisher
AMER INST PHYSICS
Issue Date
2000-02
Language
English
Article Type
Article
Keywords

PERIODIC DIELECTRIC STRUCTURES; 2-DIMENSIONAL SQUARE LATTICE; PHOTONIC CRYSTALS; DEFECT MODES; BOUND-STATES; COMPOSITES; SYSTEMS; ATOMS; WAVES; RODS

Citation

JOURNAL OF APPLIED PHYSICS, v.87, no.4, pp.1593 - 1596

ISSN
0021-8979
URI
http://hdl.handle.net/10203/70785
Appears in Collection
PH-Journal Papers(저널논문)
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