Surface acoustic wave device having excellent balancing...

Details Surface acoustic wave device having excellent balancing... Surface acoustic wave device having excellent balancing...

2005-09-06

2005-09-06

Tokar, Michael (Department: 2819)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S193000, C333S194000

Reexamination Certificate

active

06940369

ABSTRACT:
A surface acoustic wave filter has one or more surface acoustic wave filter elements having at least two comb-shaped electrode portions disposed along a propagation direction of a surface acoustic wave and first and second balanced terminals connected to the comb-shaped electrode portions provided on a piezoelectric substrate. The surface acoustic wave filter is housed in a packaging member such that the difference in capacitance between electrodes on the piezoelectric substrate, which are connected to the first and second balanced terminals, is greatly reduced.

REFERENCES:
patent: 6731188 (2004-05-01), Sawada et al.
patent: 6744333 (2004-06-01), Sawada
patent: 6771144 (2004-08-01), Takamine
patent: 2003/0035557 (2003-02-01), Takamine et al.
patent: 1 126 605 (2001-08-01), None
patent: 1 227 584 (2002-07-01), None

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