Notch filter
US4577168A · kind A · utility
61Cited by
4References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1984 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Dec 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/1708
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved notch filter having a single port, surface acoustic wave transducer in parallel with an inductor and forming a first circuit which primarily blocks the signal frequency at all frequencies except the notch frequency at which point the first circuit becomes essentially resistive and at that point is cancelled by a signal from a second circuit in parallel with said first circuit and which is 180.degree. out-of-phase thereby providing a notch filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.