Notch-enhancement in band-reject filters
US5721521A · kind A · utility
11Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1996 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Aug 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/20
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A band-reject filter includes a three port circulator having an input port, a second port connected to a bandpass filter terminated in a matched load, and a third output port. The loss of the band-reject filter is enhanced by controlling the amplitude and phase of a feed-forward signal, passing between the input port and output port, relative to the amplitude and phase of a reflected signal from the matched load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.