High frequency filter
US6870446B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2002 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Sep 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2009/02196
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high frequency filter comprises thin film piezoelectric resonators connected in series between the input/output nodes, thin film piezoelectric resonators connected in parallel between the input/output nodes and a variable voltage circuit adapted to change the voltage applied to at least either the thin film piezoelectric resonators connected in series or the thin film piezoelectric resonators connected in parallel. The resonance characteristic of at least either the thin film piezoelectric resonators connected in series or the thin film piezoelectric resonator connected in parallel is shifted by changing the voltage applied by the variable voltage circuit to change the pass characteristic of the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.