Filter circuit, duplexer and RF module
US8970320B2 · kind B2 · utility
4Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2011 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Jul 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/703
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A filter circuit includes a filter part connected between an input terminal and an output terminal and configured to have a passband, and a path connected in parallel with the filter part between the input terminal and the output terminal, the path having an impedance that enables a first signal passing through the path from the input terminal to the output terminal and a second signal passing through the filter part from the input terminal to the output terminal to have an opposite phase relationship in a frequency band outside of the passband and have almost equal amplitudes in the frequency band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.