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本文介绍中心频率 f_0=69.6MHz,3分贝带宽△f_(3dB)=4.6MHz,矩形系数 K(△f_(-30dB)/△f_(-3dB)=1.8,带内波动△R=0.3dB,旁瓣抑制SS≥35dB,插入损耗 IL=14dB,群时延波动△GDR=70ns 制作在 YX128°LiNbO_3基片上的声表面波带通滤波器的设计方法与制作过程。设计中变迹换能器采用凯塞尔窗口函数进行加权。采用分裂指、假指及其它措施抑制各种二阶效应。测试结果表明按设计要求制作的样品达到了指标要求。
In this paper, the center frequency f_0 = 69.6MHz, the bandwidth of 3dB = 3dB = 4.6MHz, the square coefficient K (Δf_ (- 30dB) / Δf_ (3dB) Side lobe suppression SS ≥ 35dB, insertion loss IL = 14dB, group delay fluctuation △ GDR = 70ns in the YX128 ° LiNbO_3 substrate surface acoustic wave band-pass filter design method and production process design of the apodizer transducer The Kessel window function is used for weighting.It uses split finger, fake finger and other measures to restrain various second-order effects.The test results show that the sample produced according to the design requirements meets the index requirements.