| 摘要 |
PROBLEM TO BE SOLVED: To provide a wideband resonator-type surface acoustic wave filter. SOLUTION: Two pieces of pair-terminal surface acoustic wave resonators, each of which is constituted by arranging three IDT electrodes closely in the direction of propagation of surface acoustic waves on the main surface of a piezoelectric substrate and arranging grating reflectors on both sides of them, are arranged side by side; the outermost electrode finger in the IDT electrode at the center of the above one pair-terminal surface wave resonator is made wider than others; and also the above two pair-terminal surface acoustic wave resonators are connected in the same phase to make input and are connected in reverse phase form an output, thus a resonator-type surface acoustic wave filter is constituted.
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