Search International and National Patent Collections

1. (WO2018164211) MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE

Pub. No.:    WO/2018/164211    International Application No.:    PCT/JP2018/008914
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Fri Mar 09 00:59:59 CET 2018
IPC: H03H 9/145
H03H 9/25
H03H 9/64
H03H 9/72
H04B 1/52
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: NAKAGAWA, Ryo
中川 亮
IWAMOTO, Hideki
岩本 英樹
TAKAI, Tsutomu
▲高▼井 努
Title: MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Abstract:
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)