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US 9,543,924 B2Granted
Ladder surface acoustic wave filter
AssigneeMurata Manufacturing Co., Lt.
InventorKazushi Watanabe
Life of this patent
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Abstract
A ladder surface acoustic wave filter includes a series arm connecting an input terminal and an output terminal, at least one parallel arm connecting the series arm and a ground terminal, at least one series arm resonator provided in the series arm, and at least two parallel arm resonators provided in at least one parallel arm and connected to each other in series. In the ladder surface acoustic wave filter, a connection point between at least the two parallel resonators connected to each other in series is grounded through an inductor.
Claims12
A ladder surface acoustic wave filter comprising:
- an inductor:
- a series arm connecting an input terminal and an output terminal;
- at least one first parallel arm connecting the series arm and a ground terminal;
- at least one series arm resonator provided in the series arm;
- and
- at least two parallel arm resonators provided in at least one second parallel arm and connected to each other in series;
- wherein
- at least one connection point between the two parallel arm resonators connected to each other in series is grounded through the inductor;
- and
- the inductor is configured to shift a resonance point of resonation by the at least two parallel arm resonators of the at least one second parallel arm to a low frequency side and defines a sub-resonance point at a high frequency side relative to an anti-resonance point of the at least two parallel arm resonators of the at least one second parallel arm.
7 more elements
Dependencies are inferred from the claim text.