Acoustic surface wave device with improved band-pass characteristics
US4426595A · kind A · utility
4Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Jan 22, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02866
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.