US Patent No. 10,483,944

MULTIPLEXER


Patent No. 10,483,944
Issue Date November 19, 2019
Title Multiplexer
Inventorship Hidetaro Nakazawa, Tokyo (JP)
Masafumi Iwaki, Tokyo (JP)
Takashi Matsuda, Tokyo (JP)
Assignee TAIYO YUDEN CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,483,944

1. A multiplexer comprising:a first filter including one or more series resonators connected in series between a common terminal and a first terminal and one or more parallel resonators connected in parallel between the common terminal and the first terminal, each of the one or more series resonators and the one or more parallel resonators including an IDT located on a piezoelectric substrate, a first region and a second region being alternately located in an extension direction of electrode fingers, which excite an acoustic wave, within an overlap region of the IDT, a width of at least one of the electrode fingers in the second region being greater than the width of the at least one of the electrode fingers in the first region, the electrode fingers overlapping in the overlap region, one or some resonators of the one or more parallel resonators and the one or more series resonators having a larger number of the second regions than one or more remaining resonators of the one or more parallel resonators and the one or more series resonators; and
a second filter connected between the common terminal and a second terminal, the second filter having a passband higher than a passband of the first filter,
wherein an emphasis mode of each of the one or some resonators is located at a frequency higher than the passband of the second filter.