High-Performance Acoustic Filtering System Using Fano and AIT Resonances in Series-Parallel Architectures of Closed Resonators

The design of next-generation acoustic devices, whether for biosensing, telecommunications, or advanced wave control, increasingly relies on the precise exploitation of resonance phenomena. These phenomena enable highly controlled manipulation of the transmission frequency, laying the groundwork for high-resolution selective filtering functions. In this work, we conduct an in-depth theoretical and numerical study of an innovative acoustic filtering system comprising four asymmetric resonators arranged in series and parallel, and coupled to a main waveguide. Using the transfer matrix method, we analyze the system’s spectral response in detail. Our results highlight the appearance of Fano-type resonances, as well as the phenomenon of acoustic induced transparency (AIT), resulting from destructive and constructive interference between the different resonance paths. The study of the associated quality factors of resonance peaks allows us to quantify the fineness of these resonances and their sensitivity to variations in the geometric parameters of the system. This sensitivity offers great flexibility in frequency control, a key element in the development of compact, efficient, and reconfigurable devices. The observed performance highlights the potential of our system for applications in the fields of medical acoustics, environmental detection, acoustic signal processing, and the development of highly selective smart sensors.