Surface acoustic wave filter and wireless device that...

Details Surface acoustic wave filter and wireless device that... Surface acoustic wave filter and wireless device that...

2007-11-06

2007-11-06

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R

Reexamination Certificate

active

10992116

ABSTRACT:
A surface acoustic wave (SAW) filter includes a piezoelectric substrate, a first interdigital transducer (IDT) for input and a second IDT for output that are provided on the piezoelectric substrate, the first IDT and the second IDT being arranged in a propagation direction, and a shield electrode arranged between the first IDT and the second IDT and/or between interconnection lines that connect the first IDT and the second IDT, at least one of the first IDT and the second IDT being of a longitudinal coupling multi-mode type having a balanced operation. Thus, it is possible to suppress a stray capacitance between the first IDT and the second IDT, and thereby to improve the symmetry of balanced operation signals.

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patent: 6759928 (2004-07-01), Endou et al.
patent: 2002/0121842 (2002-09-01), Takamine
patent: 2004/0251776 (2004-12-01), Shibahara et al.
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patent: 2003-209456 (2003-07-01), None

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