Using Helmholtz resonator arrays to improve dipole transmission efficiency in waveguide

Wang Liwei¹, Quan Li², Qian Feng^{1, 3}, Liu Xiaozhou^{1, †}

(a) Sound pressure induced by a dipole in the waveguide without HRAs at 5160 Hz. (b) Sound pressure induced by a dipole in the waveguide with HRAs whose first HR position is 2.5 mm from the source and the period is 5 mm at 5160 Hz. (c) Sound pressure level induced by a dipole at the end of the waveguide with and without HRAs.