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US 2003/0111931 A1Published application
Surface acoustic wave device and duplexer using it
AssigneeAlps Electric Co., Ltd.
InventorsJin Suzuki, Takashi Sato, Kyosuke Ozaki
Life of this patent
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Abstract
The electrode finger pitch of an interdigital transducer (IDT) and the reflecting element pitch of grating reflectors have the same value that is equal to ½ of the wavelength λ of a surface acoustic wave to be generated. The distance L between the ends of the interdigital transducer and the ends of the respective grating reflectors is given by L={(5±n)/8}λ where n is 0 or a multiple of 4 and L is a positive value.
Claims5
A surface acoustic wave device comprising:
- a piezoelectric body;
- an interdigital transducer provided on the piezoelectric body;
- and
- grating reflectors provided on both sides of the interdigital transducer, each of the grating reflectors having a plurality of reflecting elements that are arranged at prescribed intervals and have the same pitch as an electrode finger pitch of the interdigital transducer, the same pitch being ½ of a wavelength λ of a surface acoustic wave to be generated,
- wherein a distance L between ends of the interdigital transducer and ends of the respective grating reflectors is given by
- L={(5±n)/8}λ
- where n is 0 or a multiple of 4 and L is a positive value.
4 more elements
Dependencies are inferred from the claim text.