Particularly oriented plate-like monocrystalline piezoelectric body and acoustic surface wave filter device employing same
US4016440A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1975 |
| Grant date | Apr 5, 1977 |
| Priority date | — |
| Expiry date | May 21, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02559
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
This disclosure concerns a particularly oriented plate-like monocrystalline piezoelectric body of lithium niobate for use as a substrate in an acoustic surface wave filter device, wherein the orientation of the piezoelectric body of lithium niobate is responsible for a substantial reduction in spurious responses including plate modes. More specifically, the piezoelectric body comprises a plate of lithium niobate having a crystalline lattice orientation as determined by a 46.degree. (ZYW) cut. It has been determined that such a piezoelectric body may be employed as a substrate in an acoustic surface wave filter device to effect an improved filter response in that unwanted spurious responses including those caused by plate modes are removed or substantially reduced from the acoustic signals prior to their conversion into electrical output signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.