Tunable narrow band filter
US7773707B2 · kind B2 · utility
2Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2006 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Feb 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/012
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tunable narrow band radio frequency (RF) filter (200) includes an RF input (225), an RF output (227), a capacitive network (201-209) for coupling the RF input (225) with the RF output (227) and an inductive network (219-223) for resonating the filter at a predetermined center frequency. A number of semiconductor devices such as varactor diodes (215, 217, 229, 233) are used for tuning respective capacitors in the capacitive network (201-209). A single voltage source (Vc) is used for tuning each one of the respective varactor diodes for moving the resonant frequency of the filter over a substantially wide frequency range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.