Patent ID: 9154114
Filing Date: 2015-10-06
Classification: H03H

Abstract:
1. An acoustic wave device comprising: first and second unbalanced terminals; a low-frequency filter including a first longitudinally-coupled acoustic wave resonator connected to the first unbalanced terminal, the low-frequency filter having a low-frequency passband from a first minimum frequency to a first maximum frequency; a high-frequency filter connected to the second unbalanced terminal and having a high-frequency passband from a second minimum frequency higher than the first maximum frequency to a second maximum frequency; and first and second balanced terminals connected to the low-frequency filter and the high-frequency filter in common, the low-frequency filter further including a first one-terminal pair acoustic wave resonator connected between the first longitudinally-coupled acoustic wave resonator and the first balanced terminal and a second one-terminal pair acoustic wave resonator connected between the first one-terminal pair acoustic wave resonator and the first balanced terminal, an antiresonant frequency of the first one-terminal pair acoustic wave resonator and an antiresonant frequency of the second one-terminal pair acoustic wave resonator each being higher than the first maximum frequency and lower than the second minimum frequency, and the antiresonant frequency of the second one-terminal pair acoustic wave resonator being higher than the antiresonant frequency of the first one-terminal pair acoustic wave resonator.