Surface acoustic wave filter with attenuation poles

Details Surface acoustic wave filter with attenuation poles Surface acoustic wave filter with attenuation poles

2005-11-01

2005-11-01

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R

Reexamination Certificate

active

06960966

ABSTRACT:
A high-performance SAW filter is to be provided which has lower insertion loss in a pass band and high attenuation in an attenuation band on the low frequency side of the pass band. In a SAW filter with attenuation poles configured of a two-port circuit for filtering for forming a ladder type SAW filter using a SAW resonator and a two-port circuit for impedance formed of an impedance serially connected, the impedance of the two-port circuit for impedance is configured so as to form an attenuation band of a predetermined width having a sufficient attenuation characteristic on the low frequency side of a pass band.

REFERENCES:
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patent: 6150904 (2000-11-01), Taniguchi et al.
patent: 6677835 (2004-01-01), Noguchi et al.
patent: 2002/0089396 (2002-07-01), Noguchi et al.
patent: 9-261002 (1997-10-01), None
patent: 2002-124847 (2002-04-01), None

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