Notch filter
US4694266A · kind A · utility
41Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1986 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Jul 29, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6409
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A notch filter which utilizes a quadrature coupler with the input signal on one of its four terminals, a first tuned surface acoustic wave device coupled to a second on of the terminals for receiving the input signal at 0.degree. phase shift, a second tuned surface acoustic wave device coupled to a third one of the terminals for receiving the input signal with a 90.degree. phase shift and the fourth terminal being utilized as the output signal terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.