公开(公告)号：EP0579871A1

公开(公告)日：1994-01-26

申请号：EP92122035.6

申请日：1992-12-28

申请人： MITSUI MINING & SMELTING CO., LTD. ,  Yamanouchi, Kazuhiko

发明人： Yamanouchi, Kazuhiko ,  Mihota, Norihito ,  Kato, Shunji ,  Terada, Hiromu

IPC分类号： G06G7/195 ,  H03H9/44

CPC分类号： G06G7/195

摘要： A surface acoustic wave convolver includes first (2) and second (3) interdigital electrodes for exciting surface acoustic waves and an output electrode (8) for detecting the surface acoustic waves to extract a convolution output as an electrical signal, the first (2) and second (3) interdigital electrodes and the output electrode (8) being formed on a piezoelectric or electrostrictive substrate. In order to improve convolution efficiency and obtain wide-range characteristics, each of the first (2) and second (3) interdigital electrodes has a predetermined thickness, the first interdigital electrode (2) is arranged such that positive (4) and negative (5) electrodes are alternately arranged so as to have electrode widths and periods which are gradually decreased toward the output electrode, the second interdigital electrode (3) is arranged such that positive (6) and negative (7) electrodes are alternately arranged so as to have electrode widths and periods which are gradually increased toward the output electrode, and the second interdigital electrode has a double electrode structure.
In addition, in order to reduce ripples in frequency characteristics, the output electrode are divided into a plurality of pieces (8a-8d), and two end portions of each of the first (2) and second (3) interdigital electrodes are weighted.

摘要翻译： 表面声波卷积器包括用于激发表面声波的第一（2）和第二（3）叉指电极和用于检测表面声波以提取卷积输出作为电信号的输出电极（8），第一（2） 和第二（3）叉指电极，输出电极（8）形成在压电或电致伸缩基板上。 为了提高卷积效率并获得宽范围特性，第一（2）和第二（3）叉指电极中的每一个具有预定的厚度，第一交叉指状电极（2）被布置成使得正（4）和负（ 5）电极交替排列成具有朝向输出电极逐渐减小的电极宽度和周期，第二叉指电极（3）布置成使得正极（6）和负极（7）交替布置，以便 具有朝向输出电极逐渐增加的电极宽度和周期，并且第二叉指电极具有双电极结构。 此外，为了减少频率特性的波动，输出电极被分成多个片（8a-8d），并且对第一（2）和第二（3）叉指电极中的每一个的两个端部进行加权。