US Patent No. 11,115,000

EXTRACTOR


Patent No. 11,115,000
Issue Date September 07, 2021
Title Extractor
Inventorship Norihiko Nakahashi, Nagaokakyo (JP)
Assignee MURATA MANUFACTURING CO., LTD., Kyoto (JP)

Claim of US Patent No. 11,115,000


1. An extractor, comprising:a common terminal;
a first input-output terminal;
a second input-output terminal;
a band elimination filter connected between the common terminal and the first input-output terminal and that has a stop band equal or substantially equal to a first frequency band; and
a first band pass filter connected between the common terminal and the second input-output terminal and that has a pass band equal or substantially equal to a second frequency band that overlaps at least a portion of the first frequency band; wherein the first band pass filter includes:
series arm resonators that include an acoustic wave resonator and that are disposed on a series arm that connects the common terminal and the second input-output terminal to each other;
three or more parallel arm resonators that include an acoustic wave resonator and that are disposed on parallel arms that connect a ground and different nodes on the series arm to each other; and
three or more inductors that are connected between the ground and at least one of the three or more parallel arm resonators;
an inductance value of a first inductor that is connected nearest to the common terminal among the three or more inductors is smaller than an inductance value of a third inductor among the three or more inductors and an inductance value of a second inductor that is connected second-nearest to the common terminal among the three or more inductors is smaller than the inductance value of the third inductor; and
when the three or more inductors includes four or more inductors, the inductance value of the third inductor is a smallest inductance value among inductors that are connected third-nearest or more distant to the common terminal among the four or more inductors.