Variable-frequency band-elimination filter
US7911294B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2009 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Aug 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/012
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A series resonance circuit defined by a series circuit including an inductor and a capacitor and a series resonance circuit defined by a series circuit including an inductor and a capacitor are connected in shunt to a signal line. A diode is disposed between the grounding end of the series resonance circuit and the ground, and a diode is disposed between the grounding end of the series resonance circuit and the ground. The connection point between the grounding end of the series resonance circuit and the diode is connected to the ground via a frequency shifting inductor in a conductive state at high frequency, and the connection point between the grounding end of the series resonance circuit and the diode is connected to the ground via a frequency shifting inductor in a conductive state at high frequency. A matching circuit defined by a multistage T-shape LCL circuit is disposed between the series resonance circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.