Ladder-type filter, duplexer, and module
AssigneeTaiyo Yuden Co., Ltd.
InventorsEiji Kuwahara, Yuki Endo
Life of this patent
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Abstract
A ladder-type filter includes: one or more series resonators connected in series between an input terminal and an output terminal; two or more parallel resonators connected in parallel between the input terminal and the output terminal; a first inductor connected in series between at least two nodes, each of the at least two nodes being located between a corresponding parallel resonator of at least two parallel resonators of the two or more parallel resonators and ground; and a first capacitor connected in series with the first inductor between the at least two nodes.
Claims10
A ladder-type filter comprising:
- one or more series resonators connected in series between an input terminal and an output terminal;
- two or more parallel resonators connected in parallel between the input terminal and the output terminal;
- a first inductor connected in series between at least two nodes, each of the at least two nodes being located between a corresponding parallel resonator of at least two parallel resonators of the two or more parallel resonators and ground;
- and
- a first capacitor connected in series with the first inductor between the at least two nodes,
- wherein each of the at least two nodes is connected to the ground via neither the first inductor nor the first capacitor,
- each of the at least two nodes is connected to the corresponding parallel resonator via neither the first inductor nor the first capacitor, and
- any capacitor are not connected in parallel with the first inductor and the first capacitor between the at least two nodes.
A ladder-type filter comprising:
- one or more series resonators connected in series between an input terminal and an output terminal;
- two or more parallel resonators connected in parallel between the input terminal and the output terminal;
- a first inductor connected in series between at least two nodes, each of the at least two nodes being located between a corresponding parallel resonator of at least two parallel resonators of the two or more parallel resonators and ground;
- a first capacitor connected in series with the first inductor between the at least two nodes;
- a second inductor connected in series between at least one node of the at least two nodes and the ground;
- and
- a second capacitor connected in parallel to the second inductor between the at least one node and the ground.
A ladder-type filter comprising:
- one or more series resonators connected in series between an input terminal and an output terminal;
- two or more parallel resonators connected in parallel between the input terminal and the output terminal;
- a first inductor connected in series between at least two nodes, each of the at least two nodes being located between a corresponding parallel resonator of at least two parallel resonators of the two or more parallel resonators and ground;
- a first capacitor connected in series with the first inductor between the at least two nodes;
- second inductors, each of the second inductors being connected in series between a corresponding node of the at least two nodes and the ground;
- and
- second capacitors, each of the second capacitors being connected in parallel to a corresponding second inductor of the second inductors between a corresponding node of the at least two nodes and the ground.
Dependencies are inferred from the claim text.