Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2007-02-14
2011-10-11
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C333S195000, C310S31300R, C310S31300R, C029S025350, C204S192100, C427S100000
Reexamination Certificate
active
08035460
ABSTRACT:
A surface acoustic wave device includes a substrate including lithium niobate; a IDT being provided on an upper surface of the substrate and including a plurality of electrode fingers; and a protective film covering the IDT and having an uneven shape on an upper surface thereof. When a pitch width of one pitch of the IDT is p, a width of one of the electrode fingers is p1, a width between the electrode fingers is p2, and a thickness of the IDT is h, following relations are satisfied, p1+p2=p, and h/(2×p)≧4.5%. With this configuration, an appropriate reflection characteristic is realized, and the surface acoustic wave device having excellent temperature coefficient of frequency and electrical characteristic can be obtained.
REFERENCES:
patent: 5506552 (1996-04-01), Seki et al.
patent: 5729186 (1998-03-01), Seki et al.
patent: 5998907 (1999-12-01), Taguchi et al.
patent: 6037847 (2000-03-01), Ueda et al.
patent: 6791237 (2004-09-01), Yamanouchi
patent: 6975185 (2005-12-01), Tsutsumi et al.
patent: 7209018 (2007-04-01), Nakao et al.
patent: 7423365 (2008-09-01), Tsutsumi et al.
patent: 7538636 (2009-05-01), Takayama et al.
patent: 2002/0140316 (2002-10-01), Yamanouchi
patent: 2003/0080831 (2003-05-01), Naumenko et al.
patent: 2003/0151329 (2003-08-01), Kadota et al.
patent: 2004/0174233 (2004-09-01), Takayama et al.
patent: 2006/0022768 (2006-02-01), Yokota et al.
patent: 2006/0158800 (2006-07-01), Takayama et al.
patent: 2007/0096592 (2007-05-01), Kadota et al.
patent: 1 971 026 (2008-09-01), None
patent: 63260213 (1988-10-01), None
patent: 05-267990 (1993-10-01), None
patent: 07-074586 (1995-03-01), None
patent: 10-84245 (1998-03-01), None
patent: 11-055070 (1999-02-01), None
patent: 11-88100 (1999-03-01), None
patent: 2002314365 (2002-10-01), None
patent: 2003-209458 (2003-07-01), None
patent: 2004-120685 (2004-04-01), None
patent: 2004-222267 (2004-08-01), None
patent: 2004-254291 (2004-09-01), None
patent: 2005-080202 (2005-03-01), None
patent: 2005-348139 (2005-12-01), None
patent: 2005347892 (2005-12-01), None
patent: 2002-71736 (2002-09-01), None
patent: 2005-85878 (2005-08-01), None
patent: 2008-0077193 (2008-08-01), None
patent: 2004-066493 (2004-08-01), None
patent: WO 2005/034347 (2005-04-01), None
patent: 2006/003933 (2006-01-01), None
patent: 2006/032335 (2006-03-01), None
English language machine translation of JP 2005-348139 published Dec. 15, 2005.
Japanese Office action for Appl. No. JP 2006-039001 dated Mar. 23, 2010.
Japanese Office action for Appl. No. JP 2006-255588 dated Mar. 23, 2010.
International Search Report for PCT/JP2007/052631; Mar. 27, 2007.
European Search Report dated Aug. 26, 2009.
Wright; “A Review fo Saw Resonator Filter Technology”, Ultrasonics Symposium-29, 1992, pp. 29-38.
European Office action for 07 714 184.4-2215 dated Apr. 29, 2011.
Hamaoka Yosuke
Iwasaki Yukio
Nakamura Hiroyuki
Nakanishi Hidekazu
Takayama Ryoichi
Panasonic Corporation
Pearne & Gordon LLP
Summons Barbara
LandOfFree
Surface acoustic wave device, surface acoustic wave 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 Surface acoustic wave device, surface acoustic wave filter..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface acoustic wave device, surface acoustic wave filter... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4273135