Acoustic wave filter device and multiplexer using same
AssigneeMurata Manufacturing Co., Ltd.
InventorKenichi UESAKA
Life of this patent
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Abstract
An acoustic wave filter device includes first and second terminals, a longitudinally coupled resonator coupled between the first terminal and the second terminal, and an inductor connected between a path and a ground potential, the path connecting the first terminal and the longitudinally coupled resonator to each other. The longitudinally coupled resonator includes at least one first IDT electrode coupled to the first terminal, and at least one second IDT electrode connected to the second terminal. A total capacitance value of the at least one first IDT electrode is smaller than a total capacitance value of the at least one second IDT electrode.
Claims20
An acoustic wave filter device comprising:
- a first terminal;
- a second terminal;
- a longitudinally coupled resonator coupled between the first terminal and the second terminal;
- and
- an inductor connected between a path and a ground potential, the path connecting the first terminal and the longitudinally coupled resonator to each other;
- wherein
- the longitudinally coupled resonator includes:
- at least one first IDT electrode coupled to the first terminal;
- and
- at least one second IDT electrode connected to the second terminal;
- and
- a total capacitance value of the at least one first IDT electrode is smaller than a total capacitance value of the at least one second IDT electrode.
An acoustic wave filter device comprising:
- a first terminal;
- a second terminal;
- a longitudinally coupled resonator coupled between the first terminal and the second terminal;
- and
- an inductor connected between a path and a ground potential, the path connecting the first terminal and the longitudinally coupled resonator to each other;
- wherein
- the longitudinally coupled resonator includes:
- at least one first IDT electrode coupled to the first terminal;
- and
- at least one second IDT electrode connected to the second terminal and
- a total area of an intersecting region of electrode fingers of the at least one first IDT electrode is smaller than a total area of an intersecting region of electrode fingers of the at least one second IDT electrode.
Dependencies are inferred from the claim text.