Resonant Inc.
FILTER USING LITHIUM NIOBATE AND ROTATED LITHIUM TANTALATE TRANSVERSELY-EXCITED FILM BULK ACOUSTIC RESONATORS

Abstract:

Acoustic filters are disclosed. A bandpass filter has a passband between a lower band edge and an upper band edge. The bandpass filter includes a plurality of transversely-excited film bulk acoustic resonators (XBARs) connected in a ladder filter circuit. The plurality of XBARs includes at least one lithium tantalate (LT) XBAR and at least one lithium niobate XBAR. Each of the at least one LT XBAR includes an LT piezoelectric plate with Euler angles (0.degree., .beta., 0.degree.), where .beta. is greater than zero and less than or equal to 40 degrees.