| 摘要 |
PROBLEM TO BE SOLVED: To provide an SAW(surface acoustic wave) device having stable characteristic and a long life and its manufacturing method. SOLUTION: The line width W1 of the first metallic layer 6, which is positioned on the side of a piezoelectric substrate 2, of each electrode finger 5 of the comb-shaped electrodes 4 of exciting electrodes 3 is a value to be decided by the electrical characteristic of a surface acoustic wave device 1 and is a intrinsic value to be decided nearly uniquely in order to obtain a frequency characteristic requested on a prescribed piezoelectric substrate 2. The line width W2 of the second metallic layer 7 positioned on a remote side from the substrate 2 can optionally be set since it is independent from electric characteristic such as the frequency characteristic of the SAW device 1. The width W2 of the layer 7 is made larger than the width W1 of the layer 6 to improve the radiation effect of the device 1. |
