Surface acoustic wave filter device
US6259336A · kind A · utility
14Cited by
7References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 27, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | May 27, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02637
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A resonant surface acoustic wave filter device comprises an inter-digital transducer that has a first electrode area that excites a surface acoustic wave and a second electrode area that excites a surface acoustic wave of inverted phase with respect to that excited in the first electrode area, and grating reflectors. By selecting appropriately a ratio of numbers of electrode pairs and a pitch of electrodes of the first area and the second area, band pass characteristics and impedance characteristics of the filter devices can be controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.