Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-09-27
2005-09-27
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S191000
Reexamination Certificate
active
06949990
ABSTRACT:
A filter device includes a filter element that has piezoelectric thin-film resonators arranged in series arms and parallel arms, and a package that houses the filter element in a face-down state. In this filter device, the filter element and the package are electrically connected to each other through bumps. The package includes first pad parts on which the bumps are placed, and transmission paths that electrically connect the first pad parts to the outside. The filter element includes second pad parts that are electrically connected to the first pad parts through the bumps, and wiring parts that electrically connect the second pads to the piezoelectric thin-film resonators and electrically connect the piezoelectric thin-film resonators to one another. In this structure, inductances formed with the transmission paths are connected in series to the piezoelectric thin-film resonators.
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Miyashita Tsutomu
Nishihara Tokihiro
Sakashita Takeshi
Satoh Yoshio
Yokoyama Tsuyoshi
Arent & Fox PLLC
Fujitsu Limited
Fujitsu Media Device Limited
Ham Seungsook
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