Low-loss tunable radio frequency filter
US7719382B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2006 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Mar 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/012
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tunable radio frequency (RF) filter is provided. The RF filter comprises a signal transmission path having an input and an output, a plurality of resonant elements disposed along the signal transmission path between the input and the output, and a plurality of non-resonant elements coupling the resonant elements together. The resonant elements are coupled together to form a stop band having a plurality of transmission zeroes corresponding to respective frequencies of the resonant elements, and at least one sub-band between the transmission zeroes. The non-resonant elements comprise at least one variable non-resonant element for selectively introducing at least one reflection zero within the stop band to create a pass band in one of the sub-bands(s). The variable non-resonant element(s) may be configured for displacing the reflection zero(es) along the stop band to selectively move the pass band within the one sub-band or within selected ones of the sub-bands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.