Saw filter circuit

Details Saw filter circuit Saw filter circuit

2007-07-10

2007-07-10

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000

Reexamination Certificate

active

11066300

ABSTRACT:
A SAW filter circuit has: a first circuit having first to fourth connecting points, a first SAW resonator electrically connected to the first and second connecting points, second SAW resonator electrically connected to the first and third connecting points, and third SAW resonator electrically connected to the second and fourth connecting points; and a second circuit made of a fifth connecting point electrically connected to the third connecting point, a sixth connecting point electrically connected to the fourth connecting point, seventh and eighth connecting points being electrically short-circuited, a first passive element electrically connected to the fifth and sixth connecting points, a second passive element electrically connected to the fifth and seventh connecting points, and a third passive element electrically connected to the sixth and eighth connecting points. Each passive elements is an inductor or capacitor, and at least one of the first to third passive elements is a capacitor.

REFERENCES:
patent: 5499002 (1996-03-01), Kinsman
patent: 6677835 (2004-01-01), Noguchi et al.
patent: 6903631 (2005-06-01), Kushitani et al.
patent: 10-93382 (1998-04-01), None
patent: 2002-208835 (2002-07-01), None
patent: 2003-101384 (2003-04-01), None
Satoh et al., “A Low-Loss Band-Pass Filter Using SAW Resonators,” Denshi Jouhou Tsuushin Gakukai Ronbunshi, Feb. 1993, pp. 245-251, vol. J76-A, Japan.

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