A two-dimensional phononic crystals based hypersonic-wave switch is theoretically investigated. The temperature effect is considered for a two-dimensional solid–solid phononic crystal composed of a square array of Epoxy rods embedded in a Tungsten matrix. Using finite element method, temperature dependence of the band gap is examined. The numerical results show that the bandgap position and width strongly depend on the temperature and they can be modified when the temperature increases from 10 to 45 °C. Due to its good contrast with Tungsten and Epoxy in elastic properties and its high temperature dependence, Barium Strontium Titanate [Ba_0.7Sr_0.3TiO₃] (BST) is used as the defect material. Defect modes could be tuned by modifying the radius of BST filled rods. The strong temperature dependence and phononic crystals periodicity prove the structure desirable for thermal switching. A hypersonic-wave 1 × 3 switch is designed for the specific frequency f = 1.50 GHz at room temperature.

理论上研究了基于二维声子晶体的高超音波开关。对于二维固-固声子晶体，考虑了温度效应，该声子晶体由嵌入钨基体中的环氧树脂棒的方形阵列组成。使用有限元方法，检查带隙的温度依赖性。数值结果表明，带隙的位置和宽度强烈依赖于温度，当温度从10升高到45°C时，它们可以改变。钛酸钡锶[Ba _0.7 Sr _0.3 TiO ₃]（BST）用作缺陷材料。可以通过修改BST填充棒的半径来调整缺陷模式。强烈的温度依赖性和声子晶体周期性证明了热切换所需的结构。 在室温下，为特定频率f = 1.50 GHz设计了一个超音波1×3开关。