Surface acoustic wave transducer with internal acoustic reflecti

Details Surface acoustic wave transducer with internal acoustic reflecti Surface acoustic wave transducer with internal acoustic reflecti

1984-05-17

1985-08-13

Wong, Peter S.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333154, 333195, H03H 925

Patent

active

045352658

ABSTRACT:
A surface acoustic wave transducer comprises a piezoelectric substrate, a first comb-shaped electrode with strips having the same width of .lambda./8 (.lambda. is the wavelength of a surface acoustic wave), and a second comb-shaped electrode with strips having the same width of .lambda./8. The strips of these comb-shaped electrodes are spaced apart from each other for a distance of .lambda./8. The strips of either electrode form pairs. Of each pair of strips, one strip has a narrow portion having a width of .lambda./16 and the other strip has a broad portion having a width of 3.lambda./16, which extends along the narrow portion. The narrow and broad portions of the strips of either comb-shaped electrode both acoustically and electrically reflect surface acoustic waves, whereas the other portions of the strips only electrically reflect the waves.

REFERENCES:
patent: 3990023 (1976-11-01), Kodama
patent: 4007433 (1977-02-01), Houkawa et al.
patent: 4160219 (1979-07-01), Kuny
patent: 4162465 (1979-07-01), Hunsinger et al.
patent: 4206380 (1980-06-01), Hazama et al.
patent: 4346322 (1982-08-01), Sato et al.

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