Compact switchable filter for software-defined radio
US7724110B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2007 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | May 25, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/20336
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A switchable bandpass filter includes a coupled line segment (comb) including a plurality of coupled transmission lines of substantially equal lengths that are each connected or otherwise coupled to the common RF ground at their first end, a plurality of adjustable capacitors each coupled proximate a second end of respective ones of the transmission lines, and a plurality of shunt switches coupled to points along a length of each of the transmission lines. Shunt switches may be implemented by various device technologies including MEMS and FET switches and PIN diodes. The adjustable capacitors may be implemented as an array or tree of switched capacitors using suitable switching components (e.g., as previously enumerated) or by other suitable electrically controllable devices such as varactors or varactor arrays. A differential switchable filter may be formed by the symmetric repetition of individual bandpass filter modules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.