| 摘要 |
PURPOSE:To suppress a reflected wave, by roughening a reflected wave generating part of an acoustic wave, and performing an irregular reflection. CONSTITUTION:One of reedlike electrodes 2, 3 is a generating electrode of an acoustic wave, and the other is a converting electrode to an electric signal. On 2 substrate end faces 8, 9 facing the propagating direction of a boundary acoustic wave, irregular projecting and recessed parts of about 64mum wavelength of the boundary acoustic wave are formed by the use of sandpaper. As a result, a ripple generated in a conventional boundary acoustic wave device is nearly suppressed. Also, an end face reflection signal of the acoustic wave is suppressed remarkably, and a satisfactory frequency characteristic is obtained. In this regard, instead of the boundary acoustic wave, a surface acoustic wave can be utilized, too. |
