| 摘要 |
PROBLEM TO BE SOLVED: To achieve a wide bandwidth, a flatness, and a high slope gradient by making a passing band square-shaped and to miniaturize a device size in a one-directional SAW transducer arranging a floating electrode inside and a SAW device using it. SOLUTION: A driven electrode is formed by a split electrode 10 which is a pair of positive electrode fingers T1 and T2 and negative electrode fingers T3 and T4, and a reflector is formed by floating electrodes O1, O2, S1 and S2 which are electrically connected to bus bars 2 and 3. The floating electrodes S1 and S2 are functioned as a short circuit grating so as for their electrical potential to become zero around a resonance frequency by being electrically connected, and a space between a central position of the positive electrode fingers T1 and T2 and a central position of the floating electrode O1 is set as 3λ/8±nλ/2 (note: n=0, 1, 2, 3, ...). COPYRIGHT: (C)2006,JPO&NCIPI
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