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|1. (WO2018164211) MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE|
|Applicants:||MURATA MANUFACTURING CO., LTD.
|Title:||MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE|
The purpose of the present invention is to provide a multiplexer which is not prone to generate ripples in other bandpass filters due to higher-order modes. N acoustic wave filters (N an integer greater than or equal to 2) are provided that are connected in common at one end and that have different passbands. At least one acoustic wave filter 3 comprises a piezoelectric body 14 formed from lithium tantalate with Euler angles (φLT in the range 0° ± 5°, θLT and ψLT in the range 0° ± 15°), a support substrate 12, and an IDT electrode 15. In at least one of multiple acoustic wave resonators, in all acoustic wave filters (m) having a passband higher than that of at least one acoustic wave filter (n) (n < m ≤ N), the frequency fh1_t(n) of a first higher-order mode satisfies expression (3) and expression (4) below. Expression 3: fh1_t(n) > fu(m) Expression 4: fh1_t(n) < fl(m)