Boundary acoustic wave filter device

Details Boundary acoustic wave filter device Boundary acoustic wave filter device

2007-12-06

2009-11-24

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R

Reexamination Certificate

active

07623009

ABSTRACT:
A boundary acoustic wave filter device capable of increasing an out-of-band attenuation includes a dielectric film formed on a piezoelectric substrate, at least one longitudinally coupled resonator boundary acoustic wave filter having a plurality of IDTs disposed along a boundary between the piezoelectric substrate and the dielectric film, and at least two one-terminal-pair boundary acoustic wave resonators. At least one boundary acoustic wave resonator is connected in series to the longitudinally coupled resonator boundary acoustic wave filter, and at least remaining one boundary acoustic wave resonator is connected in parallel to the longitudinally coupled resonator boundary acoustic wave filter. An anti-resonant frequency of the serially connected boundary acoustic wave resonator is located in a higher frequency range than a passband of the boundary acoustic wave filter device, and a resonant frequency of the parallel-connected boundary acoustic wave resonator is equal to or higher than the anti-resonant frequency of the serially connected boundary acoustic wave resonator.

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Official Communication issued in corresponding European Patent Application No. 06746844.7, mailed on Jul. 10, 2009.
Kiselev et al., “Saw Filters with Combined Single-Mode and Double-Mode Sections,” 2002 IEEE Ultrasonics Symposium, vol. 1, Oct. 11, 2002, pp. 179-183.

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