Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-05-10
2005-05-10
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000, C333S133000, C310S31300R
Reexamination Certificate
active
06891450
ABSTRACT:
A longitudinal mode type surface acoustic wave filter comprising a first IDT electrode, second and third IDT electrodes, and first and second reflector electrodes are formed on a piezoelectric substrate. The upper electrode of the first IDT electrode is connected to one of balanced type terminals, and the lower electrode of the first IDT electrode is connected to the other balanced type terminal. Also, the lower electrode of the second IDT electrode is connected to an unbalanced type terminal, and the lower electrode is grounded. The lower electrode of the third IDT electrode is connected to the unbalanced type terminal, and the upper electrode is grounded.
REFERENCES:
patent: 5039891 (1991-08-01), Wen et al.
patent: 5568002 (1996-10-01), Kawakatsu et al.
patent: 5790000 (1998-08-01), Dai et al.
patent: 5835990 (1998-11-01), Saw et al.
patent: 5936487 (1999-08-01), Solal et al.
patent: 6081172 (2000-06-01), Strauss et al.
patent: 6441704 (2002-08-01), Ali-Hackl et al.
patent: 6472959 (2002-10-01), Beaudin et al.
patent: 20020063612 (2002-05-01), Takamine
patent: 1-151621 (1989-10-01), None
patent: 06-204781 (1994-07-01), None
patent: 11-97966 (1999-04-01), None
patent: 11-251861 (1999-09-01), None
patent: 2001-503212 (2001-03-01), None
patent: 2002-171155 (2002-06-01), None
“Behavior of SAW Device as Multi-Port Circuits . . . ”, 2001 Engineering Science Society Convention of the Institute of Electronics, Information and Communication Engineers, publication date Aug. 29, 2001 (w/ English translation).
“Effect of Stray Coupling on the Balance of a Differential LSAW Front-End Resonator-Filter for Wireless/Mobile Circuits”—P. J. Edmonson et al.—1999 IEEE Ultrasonics Symposium 1999, vol. 1 (pp. 361-364).
Mita Narihiro
Nakamura Hiroyuki
Tsuzuki Shigeru
Yamada Toru
Matsushita Electric - Industrial Co., Ltd.
RatnerPrestia
Summons Barbara
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