Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-04-16
2000-05-02
Ramirez, Nestor
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333151, 333194, H01L 4104, H03H 900
Patent
active
060576308
ABSTRACT:
There is provided a surface acoustic wave device for use as a filter in a television receiver set which can reduce reflection waves generated from outermost electrodes of input and output interdigital transducers to improve various filter characteristics. In the surface acoustic wave device having, on a piezoelectric substrate, the input interdigital transducer for converting an electric signal into a surface acoustic wave and the output interdigital transducer, disposed to oppose the input interdigital transducer, for converting the surface acoustic wave resulting from the conversion by the input interdigital transducer into an electric signal, a first dummy electrode is provided to a first outermost electrode finger of the output interdigital transducer, the first outermost electrode finger being located at one end of the output interdigital transducer opposite to the input interdigital transducer, and having an electrode aperture length of .lambda./4 where n represents a wavelength of the surface acoustic wave, and a second dummy electrode is provided to a second outermost electrode finger of the input interdigital transducer, the second outermost electrode finger being located at one edge of the input interdigital transducer opposite to the output interdigital transducer, and having an electrode aperture length of .lambda./4.
REFERENCES:
patent: 4201964 (1980-05-01), Noro et al.
patent: 4485364 (1984-11-01), DeVries
patent: 4604623 (1986-08-01), Skeie
patent: 4642507 (1987-02-01), Suthers et al.
patent: 5304965 (1994-04-01), Manner
Itoh Katsumi
Shiba Takashi
Yanagihara Hitoshi
Yuhara Akitsuna
Hitachi Media Electronics Co. Ltd.
Medley Peter
Ramirez Nestor
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