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Physical properties of novel grating‐assisted Y directional couplers are examined using the coupled‐mode theory. A general formalism for the analysis of the lateral perturbed directional coupler properties is presented. Explicit expressions for waveguide key parameters such as coupling length, grating period, and other structural characterizations, are obtained. The influence of other physical properties such as time and frequency response or cutoff conditions are also analyzed. A plane grating‐assisted directional coupler is presented and examined as a basic component in the integrated acoustic technology.