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US 12,732,161 B2Granted
High frequency filter, high frequency circuit, and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorSyunsuke Kido
Life of this patent
Estimating the term…
Abstract
A filter includes a series arm resonator and parallel arm circuits, in which the parallel arm circuit has a parallel arm resonator and a frequency variable circuit connected in series to each other, the frequency variable circuit has a capacitor and a switch connected parallel to each other, the other parallel arm circuit has a capacitor and a switch connected in series to each other.
Claims20
A high frequency filter comprising:
- a series arm resonator connected between a first terminal and a second terminal;
- a first parallel arm circuit connected between ground and a path that connects the series arm resonator to the second terminal;
- and
- a second parallel arm circuit connected between ground and the path,
- wherein the first parallel arm circuit comprises a parallel arm resonator and a frequency variable circuit connected in series to each other,
- wherein the frequency variable circuit comprises a first capacitor and a first switch connected in parallel to each other,
- wherein the second parallel arm circuit comprises a second capacitor and a second switch connected in series to each other, and
- wherein:
- 3.2
- ×
- 10
- -
- 1
- ≤
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ≤
- 6.25
- ,
- 0
- ≤
- C
-
- 2
- /
- C
-
- 0
- ,
- F
-
- 1
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ≤
- C
-
- 2
- /
- C
-
- 0
- ≤
- F
-
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ,
- F
-
- 1
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- =
- 1.08
- ×
- 10
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 2
- -
- 3.82
- ×
- 10
- -
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- +
- 1.98
- ×
- 10
- -
- 1
- ,
- F
-
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- =
- 3.77
- ×
- 10
- -
- 4
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 4
- -
- 6.31
- ×
- 10
- -
- 3
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 3
- +
- 4.
- ×
- 10
- -
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 2
- -
- 1.22
- ×
- 10
- -
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- +
- 2.71
- ×
- 10
- -
- 1
- ,
- where a capacitance value of the parallel arm resonator is C0, a capacitance value of the first capacitor is C1, and a capacitance value of the second capacitor is C2.
209 more elements
A high frequency filter comprising:
- a first series arm circuit connected between a first terminal and a second terminal;
- a frequency variable circuit connected in parallel to the first series arm circuit;
- and
- a parallel arm resonator connected between ground and a path that connects the first terminal to the second terminal,
- wherein the first series arm circuit comprises a series arm resonator and a second series arm circuit connected in series to each other,
- wherein the frequency variable circuit comprises a first capacitor and a first switch connected in series to each other,
- wherein the second series arm circuit comprises a second capacitor and a second switch connected in parallel to each other, and
- wherein:
- 5.
- ×
- 10
- -
- 2
- ≤
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ≤
- 1.44
- ,
- 2.62
- ≤
- C
-
- 2
- /
- C
-
- 0
- ,
- F
-
- 1
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ≤
- C
-
- 2
- /
- C
-
- 0
- ≤
- F
-
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ,
- F
-
- 1
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- =
- 5.23
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- -
- 0.15
- )
- -
- 1.72
- ,
- F
-
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- =
- -
- 2.98
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 3
- +
- 1.19
- ×
- 10
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 2
- -
- 1.68
- ×
- 10
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- +
- 1.11
- ×
- 10
- 1
- ,
- where a capacitance value of the series arm resonator is C0, a capacitance value of the first capacitor is C1, and a capacitance value of the second capacitor is C2.
164 more elements
A high frequency filter comprising:
- a first series arm circuit connected between a first terminal and a second terminal;
- a frequency variable circuit;
- and
- a parallel arm resonator connected between ground and a path that connects the first terminal to the second terminal,
- wherein the first series arm circuit comprises a series arm resonator and a second series arm circuit connected in series to each other,
- wherein the frequency variable circuit comprises a first capacitor and a first switch connected in parallel to the series arm resonator and connected in series to each other,
- wherein the second series arm circuit comprises a second capacitor and a second switch connected in parallel to each other, and
- wherein:
- 5.
- ×
- 10
- -
- 2
- ≤
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ≤
- 1.83
- ,
- 5.23
- ≤
- C
-
- 2
- /
- C
-
- 0
-
- F
-
- 1
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ≤
- C
-
- 2
- /
- C
-
- 0
- ≤
- F
-
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- ,
- F
-
- 1
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- =
- 1.19
- ×
- 10
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- -
- 0.25
- )
- -
- 7.71
- ×
- 10
- -
- 1
- ,
- F
-
- 2
-
- (
- C
-
- 1
- /
- C
-
- 0
- )
- =
- -
- 1.19
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 3
- +
- 5.39
- ×
- 10
- 1
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- 2
- -
- 9.19
- ×
- (
- C
-
- 1
- /
- C
-
- 0
- )
- +
- 1.1
- ×
- 10
- 1
- ,
- where a capacitance value of the series arm resonator is C0, a capacitance value of the first capacitor is C1, and a capacitance value of the second capacitor is C2.
168 more elements
Dependencies are inferred from the claim text.