Patent ID: 7449813
Filing Date: 2008-11-11
Classification: H01L,H03H,Y10T

Abstract:
1. A surface acoustic wave device comprising: a piezoelectric substrate; two acoustic reflectors formed on the piezoelectric substrate and defining an acoustic cavity between the acoustic reflectors; an alpha interdigitated transducer, IDT, formed on the piezoelectric substrate between the acoustic reflectors and comprising a first alpha bus bar electrically coupled to a first interface and a second alpha bus bar; a beta IDT formed on the piezoelectric substrate between the acoustic reflectors and comprising a first beta bus bar and a second beta bus bar electrically coupled to a second interface; and an interleaved IDT formed on the piezoelectric substrate between the alpha IDT and the beta IDT and comprising a first interleaved bus bar electrically coupled to the first alpha bus bar of the alpha IDT and a second interleaved bus bar electrically coupled to the second beta bus bar of the beta IDT, each of the alpha IDT, the beta IDT, and the interleaved IDT aligned in acoustic series with each other within the acoustic cavity, wherein at least a portion of the interleaved IDT is chirped.