Composite filter comprising a surface acoustic wave filter...

Details Composite filter comprising a surface acoustic wave filter... Composite filter comprising a surface acoustic wave filter...

2011-01-25

2011-01-25

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S133000

Reexamination Certificate

active

07876178

ABSTRACT:
A composite filter downsized without degrading its characteristics is disclosed. The filter includes a surface acoustic wave filter and an LC filter coupled to the surface acoustic wave filter. The LC filter is formed by combining a π-shaped LC filter formed of two capacitors and an inductor coupled together in a π-shape with a capacitor coupled in parallel to the inductor. The two capacitors of the π-shaped LC filter are placed on a piezoelectric substrate with their comb-shaped electrodes opposed to each other. This opposing direction differs from an opposing direction of comb-shaped electrodes of a surface acoustic wave resonator.

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English language Machine translation of JP 2000-077967 published Mar. 14, 2000.
International Search Report issued Feb. 20, 2007 in the International (PCT) Application of which the present application is the U.S. National Stage.

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