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US 9,118,303 B2Granted
Filter, duplexer, and communication module
AssigneeTaiyo Yuden Co., Ltd.
InventorShogo Inoue
Life of this patent
Estimating the term…
Abstract
A filter includes: acoustic wave resonators connected between an input terminal and an output terminal; and a cancel circuit including an input connection portion and an output connection portion connected so that the cancel circuit is connected in parallel to at least a part of the acoustic wave resonators, wherein the cancel circuit includes a first acoustic wave resonator connected between a node between the input connection portion and the output connection portion and a ground.
Claims19
A filter comprising:
- acoustic wave resonators located in a first path connected between an input terminal and an output terminal;
- and
- a cancel circuit including a second path and a first acoustic wave resonator, the second path having a first and a second nodes, each of which is located in the first path so that the second path is parallelly connected to at least a part of the acoustic wave resonators, and one end of the first acoustic wave resonator being connected to a third node that is located between the first and the second nodes in the second path and another end of the first acoustic wave resonator being connected to ground.
A duplexer comprising:
- a first filter that is connected between an antenna terminal and a first terminal and that includes a first group of acoustic wave resonators that are located in a first path connected between the antenna terminal and the first terminal;
- a second filter that is connected between the antenna terminal and a second terminal and that includes a second group of acoustic wave resonators that are located in a second path connected between the antenna terminal and the second terminal, the second filter having a passband higher than a passband of the first filter;
- and
- a cancel circuit including a third path and a first acoustic wave resonator, the third path having a first and a second nodes, each of which is located in the first path or the second path so that the third path is parallelly connected to at least a part of the first or second group of acoustic wave resonators, and one end of the first acoustic wave resonator being connected to a third node that is located between the first and the second nodes in the third path and another end of the first acoustic wave resonator being connected to ground.
1 more element
Dependencies are inferred from the claim text.