Saw notch filter for improving stop-band attenuation of a duplex

Details Saw notch filter for improving stop-band attenuation of a duplex Saw notch filter for improving stop-band attenuation of a duplex

1993-01-06

1995-12-05

Lee, Benny

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333133, 333193, 333202, 370 38, 370123, H01P 1213, H03H 1134

Patent

active

054732956

ABSTRACT:
When the bandwidth of a duplex filter having a certain band-width, intended for a radio telephone, is increased by affecting the coupling between the resonator circuits, the stop band of the filter is at the same time deteriorated. According to the invention, the stop-band attenuation can be improved by coupling a surface-wave filter, coupled as a notch circuit, in parallel with one of the resonator circuits of the duplex filter.

REFERENCES:
patent: 4509165 (1985-04-01), Tamura
patent: 4910481 (1990-03-01), Sasaki et al.
patent: 5254962 (1993-10-01), Morris et al.

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