一种低损耗高抑制的声表面波滤波器

A SAW Filter with Low Insertion Loss and High Suppression

该文采用周期调制及双通道设计的方法实现了一种低损耗高抑制声表面波滤波器的研制。该滤波器以64°Y-X LiNbO3为基片材料,其中心频率约475 MHz,插入损耗小于2 dB,阻带抑制优于60 dB及1 dB相对带宽约5%。研制的滤波器具有低插损及高阻带抑制的特性,结果表明该设计方法具有很好的实用性。

In this paper,a low loss and high suppression surface acoustic wave filter is developed by the methods of pitch-modulated IDT and two acoustic channel designs.The filter uses 64°Y-X LiNbO3 as the substrate material,its center frequency is about 475 MHz,the insertion loss is less than 2 dB,the stop band rejection is better than 60 dB and the relative bandwidth of 1 dB is about 5%.The developed filter has the characteristics of low insertion loss and high stop band rejection.The results show that the design method has good practicability.