Acoustic wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorMotoki Ozasa
Life of this patent
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Abstract
An acoustic wave device includes a common terminal, a first terminal, a second terminal, a first filter, a second filter, and an inductor. The first filter has a pass band corresponding to a relatively low frequency range and includes a surface acoustic wave filter using an SH wave. The second filter has a pass band corresponding to a relatively high frequency range. The first filter is between a branch point and the first terminal on a path connecting the common terminal and the first terminal. The second filter is between the branch point and the second terminal on a path connecting the common terminal and the second terminal. The inductor is on a path connecting the branch point and the first filter.
Claims20
An acoustic wave device comprising:
- a common terminal;
- a first terminal;
- a second terminal;
- a first filter on a first path connecting the common terminal and the first terminal and having a first pass band;
- a second filter on a second path connecting the common terminal and the second terminal and having a second pass band corresponding to a frequency range higher than the first pass band;
- and
- a first phase-shift element;
- wherein
- the first path and the second path share a path from the common terminal to a branch point;
- the first filter is a surface acoustic wave filter using an SH wave and is positioned between the branch point and the first terminal;
- the second filter is positioned between the branch point and the second terminal;
- the first phase-shift element is provided between the branch point and the first filter on the first path;
- and
- in at least a portion of the second pass band, an impedance when a first-terminal side is viewed from between the first phase-shift element and the branch point is located closer to an outermost constant-conductance circle in a Smith chart than an impedance when the first-terminal side is viewed from between the first filter and the first phase-shift element.
An acoustic wave device comprising:
- a common terminal;
- a first terminal;
- a second terminal;
- a first filter on a first path connecting the common terminal and the first terminal and having a first pass band;
- a second filter on a second path connecting the common terminal and the second terminal and having a second pass band corresponding to a frequency range higher than the first pass band;
- and
- a first phase-shift element;
- wherein
- the first path and the second path share a path from the common terminal to a branch point;
- the first filter is a surface acoustic wave filter using an SH wave and is positioned between the branch point and the first terminal;
- the second filter is positioned between the branch point and the second terminal;
- the first phase-shift element is provided between the branch point and the first filter on the first path;
- and
- in at least a portion of the second pass band, a constant conductance circle on which an impedance when a first-terminal side is viewed from between the first phase-shift element and the branch point is located is outside a constant conductance circle on which an impedance when the first-terminal side is viewed from between the first filter and the first phase-shift element is located.
Dependencies are inferred from the claim text.