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本文用微波网络法探讨一种称为叠合式晶体滤波器的新型选频器件,导出分析和设计该器件的系统程序。这种器件用两个或多个晶片叠合而成,为了经压电耦合将机械特性转变为电信号,在一部或全部相邻晶片交接面之间装有薄电极。这种结构使晶片表面的机电耦合在各晶片弹性摸之间产生具有选择性的相互作用。这些摸和其它叠合晶片所有摸之间也存在这种相互作用。因此,适当地选择材料和尺寸可以在很宽的范围内获得所需的滤波器特特性。
In this paper, a new type of frequency selective device called a superposition crystal filter is discussed by using the microwave network method, and the system program for analyzing and designing the device is derived. This device is made by laminating two or more wafers, and in order to convert the mechanical properties to electrical signals via piezoelectric coupling, a thin electrode is placed between one or all of the adjacent wafer interface. This structure allows the electromechanical coupling of the wafer surface to produce a selective interaction between the wafer’s elastic touch. There is also such an interaction between the touch and all the other laminated wafers. Therefore, the proper choice of materials and dimensions can achieve the desired filter characteristics over a wide range.