Acoustic surface wave device with improved band-pass characteris

Details Acoustic surface wave device with improved band-pass characteris Acoustic surface wave device with improved band-pass characteris

1982-01-22

1984-01-17

Miller, J. D.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313R, 333151, 333194, H01L 4110

Patent

active

044265956

ABSTRACT:
An acoustic surface wave device comprises a piezoelectric substrate (1), an input transducer (2), an output transducer (3) and acoustical absorbent layer patterns (5, 6) for absorbing undesired acoustic surface waves and bulk waves (S.sub.4, S.sub.5). Each of the acoustical absorbent layer patterns (5, 6) has zigzag-shaped or triangular shaped edges, i.e., a recess portion (R.sub.1, R.sub.3) and a protruding portion (R.sub.2, R.sub.4). The recess portion has a further recess portion (R.sub.1 ', R.sub.3 ') which is formed diagonally with respect to the propagation path of acoustic surface waves.

REFERENCES:
patent: 4139791 (1979-02-01), Yamada et al.
patent: 4146851 (1979-03-01), Dempsey et al.
patent: 4188596 (1980-02-01), Miura
patent: 4350963 (1982-09-01), Iwamoto et al.

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