Tunable surface acoustic wave resonators and filters
US9906206B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jun 20, 2016 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Oct 14, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2009/02165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Due to strong needs to reduce the dimensions and the cost of the RF filters and to reduce the number of filters required in an mobile handsets and wireless system covering numbers of operation bands, tunable RF filters which can cover as many bands or frequency ranges as possible are needed so that the number of filters can be reduced in the mobile handsets and wireless systems. This invention provides tunable surface acoustic wave resonators and filters utilizing semiconducting piezoelectric layers having embedded or elevated electrode doped regions. Both metallization ratio and loading mass are changed by varying a DC biasing voltage to effect a change in the resonant frequency of the tunable SAW devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.