Subsonic modes may cause significant radiation when they scatter at a discontinuity. In this study, we suggest an approach to filter out subsonic waves before they reach the discontinuities on the structure. This is done by imposing a material (parametric) periodicity in a fluid-loaded structure, which leads to a strong stopband interaction under a Bragg condition. The interaction is analytically described by the coupled-mode equations, derived using the method of multiple scales. Numerical illustrations are given in terms of the transmission loss for different fluid-loaded plates. The results can be utilized to suppress the undesired acoustic radiation generated by fluid-loaded structures.

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