Patent ID: 11463067

Abstract:
In a multiplexer, at least one acoustic wave filter includes a piezoelectric body made of lithium tantalate having Euler angles (φLT=0°±5°, θLT, ψLT=0°±15°), a support substrate, and an interdigital transducer (IDT) electrode. A frequency fh1_t(n) of a first higher-order mode satisfies below Formulas (3) and (4) in all acoustic wave filters (m) having a higher pass band than at least one acoustic wave filter (n) (n<m≤N) in at least one acoustic wave resonator among a plurality of acoustic wave resonators. fh1_t(n)>fu(m) Formula (3). fh1_t(n)<fl(m) Formula (4). Here, fu(m) and fl(m) represent the frequencies of the high-frequency end and the low-frequency end of the pass band in the m acoustic wave filters in Formulas (3) and (4).