Filter including bulk acoustic wave resonator
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorChang Hyun Kim
Life of this patent
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Abstract
A filter includes series units and shunt units. Each series unit includes at least one bulk acoustic wave resonator. Each shunt unit includes at least one bulk acoustic wave resonator and is disposed between one of the series units and a ground. One of the series units or one of the shunt units includes a first bulk acoustic wave resonator, a second bulk acoustic wave resonator, and a third bulk acoustic wave resonator connected in series. The second bulk acoustic wave resonator has a polarity different from a polarity of the first bulk acoustic wave resonator and a polarity of the third bulk acoustic wave resonator.
Claims19
A filter comprising:
- series units, each series unit comprising at least one bulk acoustic wave resonator;
- and
- shunt units, each shunt unit comprising at least one bulk acoustic wave resonator, each of the shunt units being disposed between one of the series units and a ground,
- wherein one of the series units or one of the shunt units comprises a first bulk acoustic wave resonator, a second bulk acoustic wave resonator, and a third bulk acoustic wave resonator connected in series,
- the second bulk acoustic wave resonator has a polarity different from a polarity of the first bulk acoustic wave resonator and a polarity of the third bulk acoustic wave resonator, and
- wherein second harmonic distortion occurring in the first bulk acoustic wave resonator is delayed by an angle Ø when passing through the second bulk acoustic wave resonator and the third bulk acoustic wave resonator, and 0<Ø≤90 or 270<Ø≤360.
A bulk acoustic resonator set, comprising:
- a first bulk acoustic wave resonator having a first length;
- a second bulk acoustic wave resonator having a second length less than the first length;
- and
- a third bulk acoustic wave resonator having a third length greater than the second length and less than or equal to the first length,
- wherein the first, second, and third bulk acoustic wave resonators are connected in series between an input terminal and an output terminal, and only two of the first, second, and third bulk acoustic wave resonators have a same polarity.
A filer comprising:
- series units, each series unit comprising at least one bulk acoustic wave resonator;
- and
- shunt units, each shunt unit comprising at least one bulk acoustic wave resonator, each of the shunt units being disposed between one of the series units and a ground,
- wherein one of the series units or one of the shunt units comprises a first bulk acoustic wave resonator, a second bulk acoustic wave resonator, and a third bulk acoustic wave resonator connected in series, and
- second harmonic distortion occurring in the first bulk acoustic wave resonator is delayed by an angle Ø when passing through the second bulk acoustic wave resonator and the third bulk acoustic wave resonator, and the angle Ø satisfies 90<Ø≤270.
A bulk acoustic resonator set, comprising:
- an input terminal;
- an output terminal;
- and
- a first bulk acoustic wave resonator, a second bulk acoustic wave resonator, and a third bulk acoustic wave resonator disposed between the input terminal and the output terminal,
- wherein the first bulk acoustic wave resonator has a first polarity, the second bulk acoustic wave resonator has a second polarity that is opposite to the first polarity, and the third bulk acoustic wave resonator has a third polarity that is identical to either the first polarity or the second polarity, and
- wherein the first bulk acoustic wave resonator has a first length, the second bulk acoustic wave resonator has a second length less than the first length, and the third bulk acoustic wave resonator has a third length less than or equal to the first length.
Dependencies are inferred from the claim text.