Two‐dimensional series expansions of cylindrical harmonics are used to study the diffraction of a wave radiated by a pulsating cylindrical transducer at a cage grating that surrounds the transducer. Farfield radiation patterns and radiation impedances, as distorted by the cage grating, are presented as a function of cage radius and number of rods. Decreasing the distance between the cylindrical scatterers and thereby increasing the scattering interaction is shown to increase the frequency range of nearly uniform cylindrical waves emitted from the grating. The shape of the radiation reactance in the frequency intervals where resonant peaks occur in the radiation resistance is explained in terms of Kramers‐Kronig relations. Good agreement is shown between the predictions of the two‐dimensional analysis and experimental measurements of farfield radiation patterns of a finite‐length transducer and cage.

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