Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2006-02-28
2006-02-28
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S133000, C310S31300R
Reexamination Certificate
active
07005948
ABSTRACT:
A surface acoustic wave device includes first stage longitudinally coupled resonator type surface acoustic wave elements and second stage longitudinally coupled resonator type surface acoustic wave elements that are cascaded to each other and are arranged on a piezoelectric substrate. Each of the first and second stage longitudinally coupled resonator type surface acoustic wave elements is provided with at least three IDTs arranged along the direction of transmission of a surface acoustic wave. The central IDT of each of the longitudinally coupled resonator type surface acoustic wave elements includes narrow pitch electrode finger portions. At least one of the number and the pitch of the electrode fingers of the narrow pitch electrode finger portions of the first stage longitudinally coupled resonator type surface acoustic wave elements is set to be different from that of the second stage longitudinally coupled resonator type surface acoustic wave elements.
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Official Communication issued in the corresponding European Application No. 04290950.7; dated Jul. 27, 2005.
Nakahashi Norihiko
Ouchi Minefumi
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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