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    • 34. 发明授权
    • Surface acoustic waver convolver
    • 表面声波卷积器
    • US5675207A
    • 1997-10-07
    • US650257
    • 1996-05-22
    • Yasuhiro HiraoKuniyuki MatsuiYasumi KobayashiKousuke TakeuchiKenichi Shibata
    • Yasuhiro HiraoKuniyuki MatsuiYasumi KobayashiKousuke TakeuchiKenichi Shibata
    • H03H9/145G06G7/195H03H9/72H03H9/76
    • H03H9/6486G06G7/195H03H9/76
    • A surface acoustic wave convolver of the present invention includes, on a surface of a piezoelectric substrate, a pair of comb-like surface acoustic wave excitation electrodes 2 and 3, and a center electrode 4. The excitation electrodes 2 and 3 are disposed opposed to each other at a specified interval while the center electrode 4 having a shorter width than a length of the excitation electrodes 2 and 3 is positioned between the electrodes 2 and 3. The center electrode 4 propagates the surface acoustic waves respectively produced by the excitation electrodes 2 and 3 in reverse directions to each other to obtain a convolution output signal. A pair of reflectors 10 are positioned on opposite sides of a region defined between the excitation electrode 2 and one end of the center electrode 4 with a width equivalent to that of the center electrode 4. Also, a pair of reflectors 11 are positioned on opposite sides of a region defined between the excitation electrode 3 and the other end of the center electrode 4 with a width equivalent to that of the center electrode 4.
    • 本发明的声表面波卷积器在压电基板的表面上包括一对梳状表面声波激励电极2和3以及中心电极4.激励电极2和3相对于 彼此以指定的间隔彼此相对,而具有比激励电极2和3的长度更短的宽度的中心电极4位于电极2,3之间。中心电极4传播由激励电极2分别产生的表面声波 和3相反方向,以获得卷积输出信号。 一对反射器10位于激活电极2和中心电极4的一端之间的区域的相对侧上,其宽度与中心电极4的宽度相同。另外,一对反射器11位于相对的位置 在激励电极3和中心电极4的另一端之间限定的区域的宽度相当于中心电极4的宽度。