Surface acoustic wave device
AssigneeCitizen Watch Co., Ltd.
InventorsYouichi Nonogaki, Yoshitaka Kinoshita, Takashi Akahane, Satoshi Sohda
Life of this patent
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Abstract
Provided is a surface acoustic wave device using a novel and steadily suppliable piezoelectric material that is resistant to a high-temperature environment and enables the surface acoustic wave device to use a 2 GHz to 2.5 GHz band or higher. The surface acoustic wave device includes: a piezoelectric substrate formed from a monocrystal of gehlenite (CAS: Ca2Al(AlSi)O7); and interdigital transducers formed on a surface acoustic wave propagation plane of the piezoelectric substrate.
Claims3
A surface acoustic wave device, comprising:
- a piezoelectric substrate formed from a monocrystal of gehlenite (CAS:
- Ca2Al(AlSi)O7);
- and
- an interdigital transducer formed on a surface acoustic wave propagation plane of the piezoelectric substrate;
- wherein the surface acoustic wave propagation plane comprises a plane that is obtained by rotating a (001) plane by an angle θ with respect to a [110] orientation, a surface acoustic wave traveling direction comprises the [110] orientation, and the angle θ satisfies 0°≤θ≤80°.
A surface acoustic wave device, comprising:
- a piezoelectric substrate formed from a monocrystal of gehlenite (CAS:
- Ca2Al(AlSi)O7);
- and
- an interdigital transducer formed on a surface acoustic wave propagation plane of the piezoelectric substrate;
- wherein the surface acoustic wave propagation plane comprises a plane that is obtained by rotating a (001) plane by an angle θ with respect to a [100] orientation, a surface acoustic wave traveling direction comprises the [100] orientation, and the angle θ satisfies 40°≤θ≤75°.
A surface acoustic wave device, comprising:
- a piezoelectric substrate formed from a monocrystal of gehlenite (CAS:
- Ca2Al(AlSi)O7);
- and
- an interdigital transducer formed on a surface acoustic wave propagation plane of the piezoelectric substrate;
- wherein the surface acoustic wave propagation plane comprises a plane that is obtained by rotating a (100) plane by an angle θ with respect to a [001] orientation, a surface acoustic wave traveling direction comprises the [001] orientation, and the angle θ satisfies 20°≤θ≤70°.
Dependencies are inferred from the claim text.