Acoustic surface wave device including a reflective multistrip coupler
US4510471A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1983 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Jul 1, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/643
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An acoustic surface wave device comprising a piezoelectric substrate provided with an input transducer (2), an output transducer (4) and a compact reflective multistrip coupler (6) in which the strips of each pair of comparatively widely spaced strips (7 or 8)in one array of mutually parallel strips are connected to respective strips of a pair of comparatively narrowly spaced strips (8 or 7) in the other array. The wide and narrow spacings alternate along each array. The improvement provides further electrodes (9) located in the relatively wide spaces in each array and electrically interconnected so as to effect a transfer of signal currents along each array and from one array to the other. The device improves efficiency, reduces insertion loss and improves the shape of the pass band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.