Notch-enhancement in band-reject filters

Details Notch-enhancement in band-reject filters Notch-enhancement in band-reject filters

1996-08-05

1998-02-24

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333176, H01P 120

Patent

active

057215219

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.

REFERENCES:
patent: 4207547 (1980-06-01), Buck
patent: 4460879 (1984-07-01), Hirose
patent: 4731587 (1988-03-01), Jensen
patent: 5132651 (1992-07-01), Ishikawa et al.
patent: 5317289 (1994-05-01), Konishi et al.

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