Using Helmholtz resonator arrays to improve dipole transmission efficiency in waveguide

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

(a) Unit cell of the waveguide with symmetric HRs. (b) Electric circuit analogy of the unit cell. (c) Effective bulk modulus and effective mass density for the unit cell. (d) Double-negative area of the unit cell.