The goal of this work is to design an acoustic mode converter. More precisely, the wave number is chosen so that two modes can propagate. We explain how to construct geometries such that the energy of the modes is completely transmitted and additionally the mode 1 is converted into the mode 2 and conversely. To proceed, we work in a symmetric waveguide made of two branches connected by two thin ligaments whose lengths and positions are carefully tuned. The approach is based on asymptotic analysis for thin ligaments around resonance lengths. We also provide numerical results to illustrate the theory.

翻译：这项工作的目标是设计一个音频模式转换器。 更准确地说, 选择波数是为了传播两种模式。 我们解释如何构建几何, 使模式的能量完全传输, 并且另外将模式1转换成模式2 和反向。 下一步, 我们用一个对称波向导, 由两根细长和方位都经过仔细调整的细长的利差连接而成的两根对称波导组成。 这个方法基于对共振长度周围的细细里拉的无症状分析。 我们还提供数字结果来说明这个理论 。