论文部分内容阅读
本专利介绍利用钛锆酸铅系陶瓷等压电体厚度方向振动的几兆赫至几十兆赫的高频能陷型多重模式滤波器。以前使用这种压电陶瓷的高频滤波器示于图1和图2。即在压电基片1′的一面上设置输入、输出电极2′和3′,另一面上设置对向电极4′,各个电极2′3′4′和基片1′的面积相比一般很小,利用基片1′的厚度方向振动。用图4所示的回路测定该滤波器的滤波特性时,
This patent describes a multi-mode high-frequency multi-mode filter capable of vibrating in the thickness direction of a piezoelectric body such as a lead zirconate titanate-based ceramic from several megahertz to several tens of megahertz. The high-frequency filter that has previously been used for such a piezoelectric ceramic is shown in FIGS. 1 and 2. Namely, the input and output electrodes 2 ’and 3’ are provided on one surface of the piezoelectric substrate 1 ’and the counter electrode 4’ is provided on the other surface. The areas of the respective electrodes 2’3’4 ’and the substrate 1’ Is small and vibrates in the thickness direction of the substrate 1 ’. When the filter characteristic of the filter is measured by the circuit shown in FIG. 4,