Band rejection filtering arrangement

Details Band rejection filtering arrangement Band rejection filtering arrangement

1989-04-07

1990-10-16

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455 83, 333109, H04B 144

Patent

active

049639455

ABSTRACT:
A band rejection filtering arrangement utilizing bandpass filters each terminated by a matched load. A quadrature hybrid circuit divides the input signals and applies them to the bandpass filters. Signals within the rejection band are dissipated by the filters and matched loads, whereas desired signals are reflected. The reflected signals are then combined by the quadrature hybrid circuit to provide the band rejected output. This arrangement is made switchable between an all pass mode and the band rejection mode by providing PIN diodes between the quadrature hybrid circuit and the bandpass filters.

REFERENCES:
patent: 2561212 (1951-07-01), Lewis
patent: 3058070 (1962-10-01), Reingold et al.
patent: 4087751 (1978-05-01), Kato et al.
patent: 4583061 (1986-04-01), O Shea

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