Acoustic wave filter and acoustic wave duplexer

Details Acoustic wave filter and acoustic wave duplexer Acoustic wave filter and acoustic wave duplexer

2006-05-23

2008-12-02

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000, C333S193000

Reexamination Certificate

active

07459992

ABSTRACT:
An acoustic wave filter includes: a ladder filter that has acoustic wave resonators connected in series and parallel arms; an inductor that is provided between a ground and at least one of the parallel-arm resonators in the ladder filter; and a resonance circuit that is provided in parallel with the inductor, and is located between the ground and the parallel-arm resonators in the ladder filter. In this acoustic wave filter, the resonance frequency of the resonance circuit is expressed as:in-line-formulae description="In-line Formulae" end="lead"?2f0−150 MHz<fr<2f0+150 MHzin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?orin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3f0−150 MHz<fr<3f0+150 MHz,in-line-formulae description="In-line Formulae" end="tail"?where fr represents the resonance frequency, and f0 represents the passband frequency of the ladder filter.

REFERENCES:
patent: 7034638 (2006-04-01), Yamamoto et al.
patent: 2001/0052830 (2001-12-01), Noguchi et al.
patent: 2003/0227358 (2003-12-01), Inose
patent: 2004/0201434 (2004-10-01), Noguchi et al.
patent: 09261002 (1997-10-01), None
patent: 10-163808 (1998-06-01), None
patent: 2004-007250 (2004-01-01), None

Affiliated with

Also associated with

Rating

Acoustic wave filter and acoustic wave duplexer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Acoustic wave filter and acoustic wave duplexer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic wave filter and acoustic wave duplexer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4030146