Electronically tunable band reject filter

Details Electronically tunable band reject filter Electronically tunable band reject filter

1981-12-28

1984-01-17

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 17R, 333110, 333176, 333202, H03H 712, H03H 1104, H01P 120

Patent

active

044266308

ABSTRACT:
An electronically tunable band reject filter rejects only frequencies of a signal that are in the reject band around its center frequency. The band reject filter includes an input directional coupler for sampling of the signal that is to be filtered and provides a first and second signal thereby. The first signal is filtered by a bandpass filter that passes only frequencies of the signal that are around the center frequency of the bandpass filter. An output directional coupler combines the second signal with the filtered signal and obtains on a difference port the difference between the second signal and the filtered signal. The frequencies of the signal that are centered around the center frequency of the bandpass filter are thereby rejected.

REFERENCES:
patent: 2492218 (1949-12-01), Guanella
patent: 2942209 (1960-06-01), Cohn
patent: 3234555 (1966-02-01), Petrilla et al.
patent: 4121182 (1978-10-01), Makimoto et al.
patent: 4302738 (1981-11-01), Cabot et al.
Liao-"Microwave Devices and Circuits", Prentice-Hall, Englewood Cliffs, N.J., Title Page and pp. 154-156.

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