Diplexers with low pass filter having distributed and non-distributed (lumped) elements
US6873225B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2003 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Apr 15, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/1758
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low pass filter comprises a first series of transmission line elements connected between an input and an output; and a second series of shunt elements connected from the transmission line elements to a ground of the filter. At least one of the shunt elements has a distributed portion and a lumped portion. The distributed portion may comprise a tube mounted tangentially on a printed circuit board. The lumped portion may comprises a coil with a first lead connected to the first series of transmission line elements, and a second lead extending into the tube. A tuning element is moveably disposed in the tube. The tuning element may have an opening for receiving the second lead of the coil. The low pass filter may be used in a diplexer with one or more high pass filters. The diplexer may include power transmission apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.