| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave apparatus which suppresses generation of spurious near a pass band and is compact, and to provide a communication apparatus. SOLUTION: The surface acoustic wave apparatus includes three IDT electrodes 2-4, 5-7 along a propagation direction of a surface acoustic wave on a piezoelectric substrate 1 and reflector electrodes 8, 10 disposed at both sides of the IDT electrodes. First and second surface acoustic wave devices 14, 15 connected in parallel to an unbalanced signal terminal 21 are formed side by side in the propagation direction, balanced signal terminals 22, 23 are connected to the central IDT electrodes 3, 6 of the first and second surface acoustic wave devices 14, 15. For the first and second surface acoustic wave devices 14, 15, a reflector electrode at a position where they are adjacent to each other, is composed of a common reflector electrode 30 and an electrode finger pitch at its central portion is formed longer than electrode finger pitches of the IDT electrodes 4, 5 adjacent to the common reflector electrode 30. COPYRIGHT: (C)2008,JPO&INPIT
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