Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2005-06-28
2005-06-28
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000
Reexamination Certificate
active
06911878
ABSTRACT:
A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.
REFERENCES:
patent: 5471178 (1995-11-01), Hickernell
patent: 5786738 (1998-07-01), Ikata et al.
patent: 5831493 (1998-11-01), Ushiroku
patent: 5905418 (1999-05-01), Ehara et al.
patent: 6208223 (2001-03-01), Shimamura et al.
patent: 6208224 (2001-03-01), Taniguchi et al.
patent: 6380823 (2002-04-01), Ikata et al.
patent: 6480075 (2002-11-01), Fujita et al.
patent: 6489860 (2002-12-01), Ohashi
patent: 6522219 (2003-02-01), Takamiya et al.
patent: 06-029779 (1994-02-01), None
patent: 10-303682 (1998-11-01), None
Anasako Kenichi
Ehara Hisanori
Fujita Yoshiaki
Komazaki Tomokazu
Oki Electric Industry Co. Ltd.
Summons Barbara
Volentine Francos & Whitt PLLC
LandOfFree
Acoustic wave branching filter having transmitting filter... 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 branching filter having transmitting filter..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic wave branching filter having transmitting filter... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3481577