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Broad forbidden bands in parallel-coupled locally resonant ultrasonic metamaterials
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10.1063/1.2839401
/content/aip/journal/apl/92/5/10.1063/1.2839401
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/5/10.1063/1.2839401
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematics of 1D standard ultrasonic metamaterials. (b) Three-dimensional (left) and cross-sectional view (right) of a standard unit. (c) The equivalent acoustic transmission line unit circuit of a standard unit. The waveguide section and the HR are modeled with distributed and lumped impedances, respectively. (d), (e), and (f) show the equivalent acoustic unit circuit of parallel-coupled structures with 2–4 HRs in a unit, respectively. indicates the incident direction of sound wave.

Image of FIG. 2.
FIG. 2.

(a) Transmission spectra for metamaterials with HRs in each unit. The periodic constant is fixed at . (b) and (c) show the frequency dependences of effective resistance and reactance, respectively.

Image of FIG. 3.
FIG. 3.

Dispersion relation for metamaterials with values. (a) and (b) reveal the real and imaginary parts of with frequency. The dispersion curve in a waveguide without shunt HRs is also shown as thick line.

Image of FIG. 4.
FIG. 4.

The frequency dependence of (a) real and (b) imaginary parts of for the standard and parallel-coupled metamaterials.

Image of FIG. 5.
FIG. 5.

The TPS simulated by FEM for metamaterials with HRs in each unit. The arrows show the moving of upper and lower band edges.

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/content/aip/journal/apl/92/5/10.1063/1.2839401
2008-02-08
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Broad forbidden bands in parallel-coupled locally resonant ultrasonic metamaterials
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/5/10.1063/1.2839401
10.1063/1.2839401
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