ASYMMETRIC ACOUSTIC WAVE TRANSMISSION USING MODE CONVERSION

Abstract

We propose a design for asymmetric acoustic transmission using mode conversion in a waveguide with gratings. First, we studied dispersion diagrams to determine the waveguide widths and clarified the mechanism of asymmetric acoustic transmission using the cutoff of a higher-order mode. Then we analyzed the sound pressure level and showed that asymmetric acoustic transmission is feasible by utilizing the mode conversion and cutoff. In addition, we investigated the structural dependence of the transmission rates for bidirectional propagation.