Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2009-01-15
2010-10-05
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000
Reexamination Certificate
active
07808344
ABSTRACT:
A longitudinally coupled resonator boundary acoustic wave filter device includes a piezoelectric substrate made of LiNbO3having a principal plane obtained by rotating the Y-axis through about 15 degrees +−10 degrees, a dielectric substrate made of silicon oxide and laminated on the piezoelectric substrate, and an electrode structure arranged at a boundary between the piezoelectric substrate and the dielectric substrate. The electrode structure includes a plurality of IDTs arranged in a direction in which a boundary acoustic wave propagates, and reflectors, wherein where in each of the plurality of IDTs, the overlap width of electrode fingers is W and the interval of electrode fingers is P, W/P is in a range of about 20 to about 45.
REFERENCES:
patent: 5585684 (1996-12-01), Abe
patent: 5874869 (1999-02-01), Ueda et al.
patent: 7078989 (2006-07-01), Inoue et al.
patent: 7151424 (2006-12-01), Kando
patent: 7339304 (2008-03-01), Kadota et al.
patent: 7459997 (2008-12-01), Takamine
patent: 7471027 (2008-12-01), Kando
patent: 2004/0070470 (2004-04-01), Takamine
patent: 2006/0181369 (2006-08-01), Shibahara
patent: 2007/0126531 (2007-06-01), Yata
patent: 05-251988 (1993-09-01), None
patent: 05-335881 (1993-12-01), None
patent: 98/52279 (1998-11-01), None
patent: WO 2004070946 (2004-08-01), None
patent: 2005/036744 (2005-04-01), None
patent: WO 2005034347 (2005-04-01), None
patent: WO 2006087875 (2006-08-01), None
Official Communication issued in International Patent Application No. PCT/JP2007/065193, mailed on Oct. 30, 2007.
Fujii Yasuhisa
Mukai Takao
Yata Masaru
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Pascal Robert
Wong Alan
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