We design a novel eight-channel demultiplexer in a solid-fluid phononic crystal structure. The basic structure has been formed by square arrangement of holes filled by water in tungsten background. These holes are embedded in background with filling fraction of 46 %. Generally, the proposed structure consists of nine type line defects for input and output channels. These line defects consist of two types of hollow cylinders. One of them is used in input channel and the other creates output channels. Input waveguide contains an L-branch waveguide which has been made by a row of hollow cylinders of water which is internally filled with tungsten. Each of output channels contains a row of hollow cylinders of Methyl Nonafluorobutyl Ether filled with tungsten. Hollow cylinders have different inner radii in each output waveguides. Hence, each output channels can transmit diverse narrow frequency passbands. We use the finite element method to determine the eigenfrequencies of structure. This structure can separate eight acoustic waves in frequency range between 166.6 kHz and 168.1 kHz. Separation of frequencies is accomplished with high quality factor and the width of frequency spectra between outputs are about 200 Hz. Crosstalk values of the proposed structure show that the eight-channel demultiplexer has efficient performance so that, the worst case of crosstalk value is equal to -26.68 dB.

我们设计了一种固态流体声子晶体结构中的新型八通道解复用器。基本结构是由钨背景中充满水的孔的方形排列形成的。这些孔嵌入背景中，填充率为46％。通常，所提出的结构包括用于输入和输出通道的九种类型的线缺陷。这些线缺陷由两种类型的空心圆柱体组成。其中一个用于输入通道，另一个用于创建输出通道。输入波导包含一个L分支波导，该L分支波导由一排内部填充有钨的中空圆柱体制成。每个输出通道均包含一排填充有钨的中空九甲基九氟丁基醚空心圆柱。空心圆柱体在每个输出波导中具有不同的内部半径。因此，每个输出通道可以传输各种窄频通带。我们使用有限元方法来确定结构的本征频率。这种结构可以分离频率范围在166.6 kHz和168.1 kHz之间的八个声波。频率分离是通过高质量因子完成的，输出之间的频谱宽度约为200 Hz。所提出的结构的串扰值表明八通道解复用器具有有效的性能，因此，串扰值的最坏情况等于-26.68 dB。频率分离是通过高质量因子完成的，输出之间的频谱宽度约为200 Hz。所提出的结构的串扰值表明八通道解复用器具有有效的性能，因此，串扰值的最坏情况等于-26.68 dB。频率分离是通过高质量因子完成的，输出之间的频谱宽度约为200 Hz。所提出的结构的串扰值表明八通道解复用器具有有效的性能，因此，串扰值的最坏情况等于-26.68 dB。