Edge chirping within series connected interdigitated transducers

摘要

The present invention provides a surface acoustic wave (SAW) architecture wherein two acoustic reflectors are formed on a piezoelectric substrate to define an acoustic cavity between the acoustic reflectors. At least one alpha interdigitated transducer (IDT) may be provided, and at least three beta IDTs are provided. These IDTs are placed in acoustic series within the acoustic cavity. The alpha IDT is electrically coupled to a first interface. The beta IDTs are coupled in electrical and acoustic series and are associated with a second interface. In certain embodiments, the at least three beta IDTs are adjacent one another, while in other embodiments an additional reflector or an alpha IDT may be placed between two beta IDTs. Edge chirping may be employed in adjacent edge portions of adjacent beta IDTs. Traditional edge chirping may be provided in adjacent edge portions of adjacent alpha and beta IDTs.