Negative refractions by triangular lattice sonic crystals in partial band gaps |
(a) Average amplitude distributions on the lateral axis for various wave frequencies (partial band gap frequencies: 14000 Hz, 14650 Hz, 14900 Hz, and second band frequencies: 15700 Hz, 16700 Hz, 17500 Hz), (b) shifting vectors r s = ( r s x , r s y ) for SCs when the number of scatterer arrays increases from 1 to 12 ( θ c ≅ 19° at a frequency of 14650 Hz). |