Antenna branching filter
US7800461B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2008 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Nov 28, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/725
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an antenna duplexer including a high band side filter, a low band side filter, and a phase shifter in a low pass configuration inserted between the high band side filter and an antenna port and taking phase matching of both filters, a resonance inductor resonating with a capacitor on the antenna port side is provided to obtain a attenuation characteristic in an optional band in an out-of-pass band of both filters by the resonance. For instance, the maximum attenuation is held at twice of the center frequency fL of a pass band of the low band side filter. The LC resonance circuit configuration can be desirably modified into a configuration such that a resonance capacitor is provided to an inductor in a phase shifter having a high band side filter configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.