Filter apparatus

Details Filter apparatus Filter apparatus

1990-06-11

1992-07-21

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333206, 333134, H01P 120, H03H 1100

Patent

active

051326515

ABSTRACT:
A filter apparatus in accordance with the present invention comprises, for example, a band-pass filter and a plurality of band-stop filters connected as the post-stage to the band-pass filter. The band-pass filter transmits a band containing a desired frequency band, and the band-stop filters attenuate undesirable frequency bands. Another filter apparatus in accordance with the present invention comprises, for example, a first band-pass filter, a circulator connected to the first band-pass filter, and second band-pass filters connected to the circulator. The first band-pass filter transmits a band containing a desired frequency band to the circulator, and the second band-pass filters transmit undesirable frequency bands and reflect the desire frequency band to the circulator. The desired frequency band is outputted from this circulator. Still another filter apparatus in accordance with the present invention comprises, for example, a circulator and a band-pass filter connected to the circulator. The band-pass filter transmits an undesirable frequency band and reflects a desired frequency band to the circulator. The desired frequency band is outputted from this circulator.

REFERENCES:
patent: 2297451 (1942-09-01), Beudel et al.
patent: 2994844 (1961-08-01), Niederman
patent: 3287667 (1966-11-01), Boutelant
patent: 4159454 (1979-06-01), Willmore
patent: 4292607 (1981-09-01), Goldie et al.
patent: 4538123 (1985-08-01), Mariani et al.
patent: 4553264 (1985-11-01), Hasegawa et al.
patent: 4816788 (1989-03-01), Ishikawa et al.
patent: 4823098 (1989-04-01), DeMuro et al.
patent: 4910481 (1990-03-01), Sasaki et al.
Patent Abstracts of Japan, JP-A-62 039 902, Feb. 20, 1987.
Patent Abstracts of Japan, JP-A-63 142 701, Jun. 15, 1988.
Patent Abstracts of Japan, JP-A-63 010 801, Jan. 18, 1988.
Patent Abstracts of Japan, JP-A-63 157,501, Jun. 30, 1988.

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