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US 12,647,089 B2Granted
Filter device and radio frequency front end circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorMasayuki Kikuda
Life of this patent
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Abstract
A filter device includes input and output terminals, first and second ground electrodes opposed to each other, and a resonator connected to one of the input and output terminals. The resonator includes a third ground electrode, and first, second, and third resonant portions. The third ground electrode is between and connected to the first and second ground electrodes. The first resonant portion is between the first and third ground electrodes, and connected to the third ground electrode and one of the input and output terminals. The second resonant portion is between the first and third ground electrodes, and connected to the third ground electrode. The third resonant portion is between the second and third ground electrodes, and connected to the third ground electrode.
Claims18
A filter device comprising:
- a dielectric substrate including a plurality of dielectric layers that are stacked;
- an input terminal;
- an output terminal;
- a first ground electrode and a second ground electrode opposed to each other;
- a first resonator connected to one of the input terminal and the output terminal;
- and
- a second resonator connected to another terminal of the input terminal and the output terminal different from the one of the input terminal and the output terminal;
- wherein
- the first resonator includes:
- a first intermediate ground electrode between the first ground electrode and the second ground electrode and connected to the first ground electrode and the second ground electrode;
- a first resonant portion between the first ground electrode and the first intermediate ground electrode and connected to the first intermediate ground electrode and the one of the input terminal and the output terminal;
- a second resonant portion between the first ground electrode and the first intermediate ground electrode and connected to the first intermediate ground electrode;
- and
- a third resonant portion between the second ground electrode and the first intermediate ground electrode and connected to the first intermediate ground electrode;
- and
- each of the first resonant portion, the second resonant portion, and the third resonant portion includes a first conductor including a via provided inside the dielectric substrate;
- and
- the second resonator includes:
- a second intermediate ground electrode between the first ground electrode and the second ground electrode and connected to the first ground electrode and the second ground electrode;
- a fourth resonant portion between the first ground electrode and the second intermediate ground electrode and connected to the second intermediate ground electrode and the another terminal;
- a fifth resonant portion between the first ground electrode and the second intermediate ground electrode and connected to the second intermediate ground electrode;
- and
- a sixth resonant portion between the second ground electrode and the second intermediate ground electrode and connected to the second intermediate ground electrode.
20 more elements
A filter device comprising:
- an input terminal;
- an output terminal;
- a first ground electrode and a second ground electrode opposed to each other;
- a first resonator connected to the input terminal;
- a second resonator connected to the output terminal;
- and
- at least one intermediate resonator coupled to at least one of the first resonator and the second resonator by inductive coupling;
- wherein
- the first resonator includes:
- a first intermediate ground electrode between the first ground electrode and the second ground electrode and connected to the first ground electrode and the second ground electrode;
- a first resonant portion between the first ground electrode and the first intermediate ground electrode and connected to the first intermediate ground electrode and the input terminal;
- a second resonant portion between the first ground electrode and the first intermediate ground electrode and connected to the first intermediate ground electrode;
- and
- a third resonant portion between the second ground electrode and the first intermediate ground electrode and connected to the first intermediate ground electrode;
- and
- the second resonator includes:
- a second intermediate ground electrode between the first ground electrode and the second ground electrode and connected to the first ground electrode and the second ground electrode;
- a fourth resonant portion between the first ground electrode and the second intermediate ground electrode and connected to the second intermediate ground electrode and the output terminal;
- a fifth resonant portion between the first ground electrode and the second intermediate ground electrode and connected to the second intermediate ground electrode;
- and
- a sixth resonant portion between the second ground electrode and the second intermediate ground electrode and connected to the second intermediate ground electrode.
18 more elements
Dependencies are inferred from the claim text.