SAW component with piezoelectric substrate - uses interdigitating partial transducers connected in parallel with defined number of prongs and wave propagation speed

摘要

The component has a piezoelectric substrate with two interdigitated transducers and strip reflectors in either side of them acting as a resonator group. A collector electrode (55,56) lies symmetrical to one of the transducers up to the outer edges of the strip reflectors. The transducers comprise parallel adjacent partial transducers (52,53,54), the number of teeth and the surface wave propagation speed being defined by a given equation. Blind prongs (532,542) are provided at defined positions with a specific spacing between the prongs and the collector electrode. USE/ADVANTAGE - For narrow band bandpass filter and oscillator, with max. bandwidth adjustment for given damping.