Surface acoustic wave device used in filters and delay lines based on surface acoustic waves, represents difference between respective displacement and inclination angle of transducers using specific relation

摘要

The device has fan-shaped inter digital transducers (1,2) that are arranged on piezoelectric substrate (S), and grouped into cells (111-114,121-124,211-214,221-214) of unidirectional transducers. Each transducer is composed of two partial transducers (11,12,21,22) that are arranged in average line direction, and inclined at specific angle. A difference between respective displacement and inclination angle of the transducers is represented using specific relation combining maximum cell length, minimal cell length, and aperture of shifts between the transducers.