Efficient Modal Analysis of Uniform and Quasi-Uniform Acoustic Leaky-Wave Antennas

Paper in proceeding, 2026

The efficient leaky-mode analysis of uniform and quasi-uniform acoustic leaky waveguides using transverse equivalent networks (TENs) is presented in this work. As representative examples, two basic types of acoustic leaky-wave antennas (ALWAs) formed by open perturbations on the narrow wall of a rectangular waveguide are analyzed. The first configuration corresponds to a slitted waveguide, representative of a uniform ALWA type, while the second is a perforated or holey waveguide that exemplifies a quasi-uniform ALWA. The TENs are constructed using equivalent electro-acoustic impedances, and the resulting leaky-mode dispersion curves for the dominant modes of these acoustic waveguides show good agreement with full-wave numerical simulations.