STUDY ON THE BAND GAPS OF COMPLEX SQUARELATTICES PHONONIC CRYSTAL WITH SQUARE RODS-AIR SYSTEM

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Journal of Vibration and Shock ›› 2010, Vol. 29 ›› Issue (4) : 204-206.

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STUDY ON THE BAND GAPS OF COMPLEX SQUARELATTICES PHONONIC CRYSTAL WITH SQUARE RODS-AIR SYSTEM

HU Jiaguang1; ZHANG Jin 2

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Abstract

The plane wave expansion method was employed to calculate the elastic wave band gaps of complex structures phononic crystal that is achieved by adding a smaller square rod at the center of each unit cell in simple square lattices with square rods-air system. Numerical results show that, the band gaps are easy to be opened and enlarged by reducing the symmetry of simple lattices to lift the degeneracy of bands, the larger the filling fractions, the smoother the bands, and the more the band gaps. At the same filling fraction, the widths and mid-frequencies of lowest band gaps are increased by augmenting the cross section length ratio of inserts with original rods , and the widest band gaps can be obtained when the ratio equal one.

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phononic crystal / band structure / elastic wave band gap / plane wave expansion method

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HU Jiaguang;ZHANG Jin . STUDY ON THE BAND GAPS OF COMPLEX SQUARELATTICES PHONONIC CRYSTAL WITH SQUARE RODS-AIR SYSTEM[J]. Journal of Vibration and Shock, 2010, 29(4): 204-206